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EZBuckTM 5A Simple Buck Regulator
February 2006
General Description The AOZ1014 is a high efficiency, simple to use, 5A buck regulator. The AOZ1014 works from a 4.5V to 16V input voltage range, and provides up to 5A of continuous output current with an output voltage adjustable down to 0.8V. The AOZ1014 comes in SO-8 and DFN-8 packages and is rated over a -40C to +85C ambient temperature range.
Features * 4.5V to 16V operating input voltage range * 32 m internal PFET switch for high efficiency: up to 95% * Internal soft start * Output voltage adjustable to 0.8V * 5A continuous output current * Fixed 500kHz PWM operation * Cycle-by-cycle current limit * Short-circuit protection * Thermal shutdown * Small size SO-8 and DFN-8 packages Applications * Point of load dc/dc conversion * PCIe graphics cards * Set top boxes * DVD drives and HDD * LCD panels * Cable modems * Telecom/Networking/Datacom equipment
Typical Application
VIN
22uF
C1
VIN
From uPC
EN
L1 4.7uH
AOZ1014
COMP
RC
LX
R1
VOUT
+3.3V Output @5A
FB AGND PGND
D1 R2
C2
100uF
CC
Figure 1. 3.3V/5A Buck Down Regulator
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Ordering Information Part Number AOZ1014AI AOZ1014DI Pin Configuration Ambient Temperature Range -40C to +85C -40C to +85C Package SO-8 DFN-8 Environmental RoHS RoHS
SO-8 VIN PGND AGND FB 1 2 3 4 8 7 6 5 LX LX EN COMP
VIN PGND AGND FB
1
DFN-8
8
LX
2 3 AGND 4 5 7 6
LX LX EN COMP
Pin Description Pin Number 1 2 3 Pin Name VIN PGND AGND Pin Function Supply voltage input. When VIN rises above the UVLO threshold the device starts up. Power ground. Electrically needs to be connected to AGND. Reference connection for controller section. Also used as thermal connection for controller section. Electrically needs to be connected to PGND. The FB pin is used to determine the output voltage via a resistor divider between the output and GND. External loop compensation pin. The enable pin is active high. Connect EN pin to VIN if not used. Do not leave the EN pin floating. PWM output connection to inductor. Thermal connection for output stage.
4 5 6 7,8
FB COMP EN LX
Absolute Maximum Ratings(1) Parameter Supply Voltage (VIN) LX to AGND EN to AGND FB to AGND COMP to AGND PGND to AGND Junction Temperature (TJ) Storage Temperature (TS) ESD Rating(3)
February 2006
Recommend Operating Ratings(2) Units 18V -0.7V to VIN+0.3V -0.3V to VIN+0.3V -0.3V to 6V -0.3V to 6V -0.3V to +0.3V +150C -65C to +150C 2kV
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Parameter Supply Voltage (VIN) Output Voltage Range Ambient Temperature (TA) Package Thermal Resistance SO-8 (JA) DFN-8 (JA)
Units 4.5V to 16V 0.8V to VIN -40C to +85C 82 C/W 50 C/W
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Electrical Characteristics TA = 25C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified(4). Parameter Supply Voltage Input Under-Voltage Lockout Threshold Supply Current (Quiescent) Shutdown Supply Current Feedback Voltage Load Regulation Line Regulation Feedback Voltage Input Current EN input Threshold EN Input Hysteresis Modulator Frequency Maximum Duty Cycle Minimum Duty Cycle Error Amplifier Voltage Gain Error Amplifier Transconductance Protection Current Limit Over-Temperature Shutdown Limit Soft Start Interval Output Stage High-Side Switch On-Resistance Symbol VIN VUVLO IIN IOFF VFB Conditions VIN rising VIN falling IOUT = 0, VFB = 1.2V, VEN >2V VEN = 0V 0.782 MIN 4.5 4.00 3.70 2 3 0.8 0.5 1 TYP MAX 16 UNITS V V V mA
A
3 20 0.818
IFB VEN VHYS fO DMAX DMIN
Off threshold On threshold
200 0.6 2.0 100 350 100 500 600 6 500 200
V % % nA V V mV kHz % % V/V
A/V
ILIM TJ rising TJ falling tSS VIN = 12V VIN = 5V
6 145 100 4 25 41
8
A C C ms m m
32 55
Notes: 1. Exceeding the Absolute Maximum ratings may damage the device. 2. The device is not guaranteed to operate beyond the Maximum Operating ratings. 3. Devices are inherently ESD sensitive, handling precautions are required. Human body model rating: 1.5K in series with 100pF. 4. Specification in BOLD indicate an ambient temperature range of -40C to +85C. These specifications are guaranteed by design.
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Functional Block Diagram
Vin
EN
UVLO & POR
5V LDO REGULATOR Internal +5V
OTP
REFERENCE & BIAS
+ ISEN SOFTSTART ILIMIT Q1
0.8V FB
+ + EAMP PWM - COMP +
PWM CONTROL LOGIC LEVEL SHIFTER + FET DRIVER
LX LX
COMP
500Khz OSCILLATOR
AGND
PGND
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Typical Performance Characteristics Circuit of figure 1. TA = 25C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified. Light load (DCM) operation
Vin ripple
0.1V/div
Full load (CCM) operation
Vin ripple
0.1V/div
Vo ripple
50mV/div
Vo ripple
50mV/div
Iin 2A/div VLX 10V/div
Iin 2A/div
VLX 10V/div
1us/div Start up to full load
Vin 5V/div
1us/div Full load to turn off
Vin 5V/div
Vo 1V/div Iin 1A/div
Vo 1V/div Iin 1A/div
1ms/div Load transient
1ms/div Light load to turn off
Vo Ripple
0.2V/div
Vin 5V/div
Io 2A/div
Vo 1V/div Iin 1A/div
100us/div
1s/div
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Short circuit protection Short circuit recovery
Vo
2V/div
Vo
2V/div
IL 2A/div
IL 2A/div
100us/div
1ms/div
Efficiency (Vin=12V) vs. load current
AOZ1014 Efficiency
95%
8.0V output
5.0V output
90%
Eff (%)
3.3V output
85%
8 V out 5 V out 3.3 V out
80%
75% 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Load current (A)
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Thermal de-rating curves for SO-8 package part under typical input and output condition Circuit of figure 1. 25C ambient temperature and natural convection (air speed<50LFM) unless otherwise specified. AOZ1014AI De-rating curves at 5 V input
AOZ1014AI De-rating Curve at 5V Input
6
5
1.8V output 3.3V output 5.0V output
Output Current (Io)
4
3
2
1
0 25 35 45 55 65 75 85
Ambient Temperature (Ta) 1.8V output 3.3V output 5V output
AOZ1014AI De-rating curves at 12 V input
AOZ1014AI De-rating Curve at 12V Input
6
1.8V output
5
5.0V output
4
3.3V output 8.0V output
Output Current (Io)
3
2
1
0 25 35 45 55 65 75 85
Ambient Temperature (Ta) 1.8V output 3.3V output 5.0V output 8.0V output
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Thermal de-rating curves for DFN-8 package part under typical input and output condition Circuit of figure 1. 25C ambient temperature and natural convection (air speed<50LFM) unless otherwise specified. AOZ1014DI De-rating curves at 5 V input
AOZ1014DI De-rating Curve at 5V Input
5
1.8V output 3.3V output 5.0V output
4
Output Current (Io)
3
2
1
0 25 35 45 55 65 75 85
Ambient Temperature (Ta) 1.8V output 3.3V output 5V output
AOZ1014DI De-rating curves at 12 V input
AOZ1014DI De-rating Curve at 12V Input
5
8.0V output 1.8V output
4
3.3V output 5.0V output
Output Current (Io)
3
2
1
0 25 35 45 55 65 75 85
Ambient Temperature (Ta) 1.8V output 3.3V output 5.0V output 8.0V output
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Detailed Description The AOZ1014 is a current-mode step down regulator with integrated high side PMOS switch and a low side freewheeling Schottky diode. It operates from a 4.5V to 16V input voltage range and supplies up to 5A of load current. The duty cycle can be adjusted from 6% to 100% allowing a wide range of output voltage. Features include enable control, Power-On Reset, input under voltage lockout, fixed internal soft-start and thermal shut down. The AOZ1014 is available in SO-8 and thermally enhanced DFN-8 package. Enable and Soft Start The AOZ1014 has internal soft start feature to limit inrush current and ensure the output voltage ramps up smoothly to regulation voltage. A soft start process begins when the input voltage rises to 4.0V and voltage on EN pin is HIGH. In soft start process, the output voltage is ramped to regulation voltage in typically 4ms. The 4ms soft start time is set internally. The EN pin of the AOZ1014 is active high. Connect the EN pin to VIN if enable function is not used. Pull it to ground will disable the AOZ1014. Do not leave it open. The voltage on EN pin must be above 2.0 V to enable the AOZ1014. When voltage on EN pin falls below 0.6 V, the AOZ1014 is disabled. If an application circuit requires the AOZ1014 to be disabled, an open drain or open collector circuit should be used to interface to EN pin. Steady-State Operation Under steady-state conditions, the converter operates in fixed frequency and Continuous-Conduction Mode (CCM). The AOZ1014 integrates an internal P-MOSFET as the high-side switch. Inductor current is sensed by amplifying the voltage drop across the drain to source of the high side power MOSFET. Output voltage is divided down by the external voltage divider at the FB pin. The difference of the FB pin voltage and reference is amplified by the internal transconductance error amplifier. The error voltage, which shows on the COMP pin, is compared against the current signal, which is sum of inductor current signal and ramp compensation signal, at PWM comparator input. If the current signal is less than the error voltage, the internal high-side switch is on. The inductor current flows from the input through the inductor to the output. When the current signal exceeds the error voltage, the high-side switch is off. The inductor current is freewheeling through the external Schottky diode to output. The AOZ1014 uses a P-Channel MOSFET as the high side switch. It saves the bootstrap capacitor normally seen in a circuit which is using an NMOS switch. It allows 100% turn-on of the upper switch to achieve linear regulation mode of operation. The minimum voltage drop from VIN to VO is the load current times DC resistance of MOSFET plus DC resistance of buck inductor. It can be calculated by equation below:
VO _ MAX = VIN - I O x ( RDS ( ON ) + Rinductor )
Where VO_MAX is the maximum output voltage; VIN is the input voltage from 4.5V to 16V; IO is the output current from 0A to 5A; RDS(ON) is the on resistance of internal MOSFET, the value is between 25m and 55m depending on input voltage and junction temperature; Rinductor is the inductor DC resistance; Switching Frequency The AOZ1014 switching frequency is fixed and set by an internal oscillator. The practical switching frequency could range from 350kHz to 600kHz due to device variation. Output Voltage Programming Output voltage can be set by feeding back the output to the FB pin with a resistor divider network. In the application circuit shown in Figure 1. The resistor divider network includes R1 and R2. Usually, a design is started by picking a fixed R2 value and calculating the required R1 with equation below.
VO = 0.8 x (1 +
R1 ) R2
Some standard value of R1, R2 for most commonly used output voltage values are listed in Table 1. Table 1. Vo (V) 0.8 1.2 1.5 1.8 2.5 3.3 5.0
R1 (k) 1.0 4.99 10 12.7 21.5 31.6 52.3
R2 (k) open 10 11.5 10.2 10 10 10
Combination of R1 and R2 should be large enough to avoid drawing excessive current from the output, which will cause power loss.
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Since the switch duty cycle can be as high as 100%, the maximum output voltage can be set as high as the input voltage minus the voltage drop on upper PMOS and inductor. Protection Features The AOZ1014 has multiple protection features to prevent system circuit damage under abnormal conditions. Over Current Protection (OCP) The sensed inductor current signal is also used for over current protection. Since the AOZ1014 employs peak current mode control, the COMP pin voltage is proportional to the peak inductor current. The COMP pin voltage is limited to be between 0.4V and 2.5V internally. The peak inductor current is automatically limited cycle by cycle. The cycle by cycle current limit threshold is set between 6A and 8A. When the load current reaches the current limit threshold, the cycle by cycle current limit circuit turns off the high side switch immediately to terminate the current duty cycle. The inductor current stop rising. The cycle by cycle current limit protection directly limits inductor peak current. The average inductor current is also limited due to the limitation on peak inductor current. When cycle by cycle current limit circuit is triggered, the output voltage drops as the duty cycle decreasing. The AOZ1014 has internal short circuit protection to protect itself from catastrophic failure under output short circuit conditions. The FB pin voltage is proportional to the output voltage. Whenever FB pin voltage is below 0.2V, the short circuit protection circuit is triggered. As a result, the converter is shut down and hiccups at a frequency equals to 1/8 of normal switching frequency. The converter will start up via a soft start once the short circuit condition disappears. In short circuit protection mode, the inductor average current is greatly reduced because of the low hiccup frequency. Power-On Reset (POR) A power-on reset circuit monitors the input voltage. When the input voltage exceeds 4V, the converter starts operation. When input voltage falls below 3.7V, the converter will be shut down. Thermal Protection An internal temperature sensor monitors the junction temperature. It shuts down the internal control circuit and high side PMOS if the junction temperature exceeds 145C. The regulator will restart automatically under the control of soft-start circuit when the junction temperature decreases to 100C.
February 2006
Application Information The basic AOZ1014 application circuit is shown in Figure 1. Component selection is explained below. Input capacitor The input capacitor must be connected to the VIN pin and PGND pin of the AOZ1014 to maintain steady input voltage and filter out the pulsing input current. The voltage rating of input capacitor must be greater than maximum input voltage plus ripple voltage. The input ripple voltage can be approximated by equation below:
VIN =
IO V V x (1 - O ) x O f x C IN VIN VIN
Since the input current is discontinuous in a buck converter, the current stress on the input capacitor is another concern when selecting the capacitor. For a buck circuit, the RMS value of input capacitor current can be calculated by:
I CIN _ RMS = I O x
VO V (1 - O ) VIN VIN
if let m equal the conversion ratio:
VO =m VIN
The relation between the input capacitor RMS current and voltage conversion ratio is calculated and shown in Fig. 2 below. It can be seen that when VO is half of VIN, CIN is under the worst current stress. The worst current stress on CIN is 0.5*IO.
0.5 0.5 0.4
0.3 I CIN_RMS ( m) IO 0.2
0.1 0 0 0 0 0.5 m 1 1
Figure 2. ICIN vs. voltage conversion ratio For reliable operation and best performance, the input capacitors must have current rating higher than ICIN-RMS at worst operating conditions. Ceramic capacitors are preferred for input capacitors because of their low ESR
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and high ripple current rating. Depending on the application circuits, other low ESR tantalum capacitor may also be used. When selecting ceramic capacitors, X5R or X7R type dielectric ceramic capacitors are preferred for their better temperature and voltage characteristics. Note that the ripple current rating from capacitor manufactures are based on certain amount of life time. Further de-rating may be necessary for practical design requirement. Inductor The inductor is used to supply constant current to output when it is driven by a switching voltage. For given input and output voltage, inductance and switching frequency together decide the inductor ripple current, which is, Table below lists some inductors for typical output voltage design. Table 2. Vout L1 5.0 V Shielded, 4.7uH MSS1278-472MLD Shielded, 4.7uH MSS1260-472MLD 3.3 V Un-shielded, 3.3uH DO3316P-332MLD Shielded, 3.3uH DO1260-332NXD Shield, 3.3uH ET553-3R3 1.8 V Shield, 2.2uH ET553-2R2 Un-shielded, 2.2uH DO3316P-222MLD Shielded, 2.2uH MSS1260-222NXD
Manufacture Coilcraft Coilcraft Coilcraft Coilcraft ELYTONE ELYTONE Coilcraft Coilcraft
I L =
VO V x (1 - O ) f xL VIN
The peak inductor current is:
I Lpeak
I = IO + L 2
Output Capacitor The output capacitor is selected based on the DC output voltage rating, output ripple voltage specification and ripple current rating. The selected output capacitor must have a higher rated voltage specification than the maximum desired output voltage including ripple. De-rating needs to be considered for long term reliability. Output ripple voltage specification is another important factor for selecting the output capacitor. In a buck converter circuit, output ripple voltage is determined by inductor value, switching frequency, output capacitor value and ESR. It can be calculated by the equation below:
High inductance gives low inductor ripple current but requires larger size inductor to avoid saturation. Low ripple current reduces inductor core losses. It also reduces RMS current through inductor and switches, which results in less conduction loss. Usually, peak to peak ripple current on inductor is designed to be 20% to 30% of output current. When selecting the inductor, make sure it is able to handle the peak current without saturation even at the highest operating temperature. The inductor takes the highest current in a buck circuit. The conduction loss on inductor needs to be checked for thermal and efficiency requirements. Surface mount inductors in different shape and styles are available from Coilcraft, Elytone and Murata. Shielded inductors are small and radiate less EMI noise. But they cost more than unshielded inductors. The choice depends on EMI requirement, price and size.
VO = I L x ( ESRCO +
1 ) 8 x f x CO
where CO is output capacitor value and ESRCO is the Equivalent Series Resistor of output capacitor. When low ESR ceramic capacitor is used as output capacitor, the impedance of the capacitor at the switching frequency dominates. Output ripple is mainly caused by capacitor value and inductor ripple current. The output ripple voltage calculation can be simplified to:
VO = I L x
1 8 x f x CO
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If the impedance of ESR at switching frequency dominates, the output ripple voltage is mainly decided by capacitor ESR and inductor ripple current. The output ripple voltage calculation can be further simplified to:
VO = I L x ESRCO
For lower output ripple voltage across the entire operating temperature range, X5R or X7R dielectric type of ceramic, or other low ESR tantalum are recommended to be used as output capacitors. In a buck converter, output capacitor current is continuous. The RMS current of output capacitor is decided by the peak to peak inductor ripple current. It can be calculated by:
The compensation design is actually to shape the converter close loop transfer function to get desired gain and phase. Several different types of compensation network can be used for the AOZ1014. For most cases, a series capacitor and resistor network connected to the COMP pin sets the pole-zero and is adequate for a stable high-bandwidth control loop. In the AOZ1014, FB pin and COMP pin are the inverting input and the output of internal transconductance error amplifier. A series R and C compensation network connected to COMP provides one pole and one zero. The pole is:
f p2 =
GEA 2 x CC x GVEA
I CO _ RMS
I =L 12
Usually, the ripple current rating of the output capacitor is a smaller issue because of the low current stress. When the buck inductor is selected to be very small and inductor ripple current is high, output capacitor could be overstressed. Loop Compensation The AOZ1014 employs peak current mode control for easy use and fast transient response. Peak current mode control eliminates the double pole effect of the output L&C filter. It greatly simplifies the compensation loop design. With peak current mode control, the buck power stage can be simplified to be a one-pole and one-zero system in frequency domain. The pole is dominant pole and can be calculated by:
Where GEA is the error amplifier transconductance, which is 200* -6 A/V; 10 GVEA is the error amplifier voltage gain, which is 500 V/V; CC is compensation capacitor; The zero given by the external compensation network, capacitor CC and resistor RC, is located at:
fZ2 =
1 2 x CC x RC
f p1 =
1 2 x CO x RL
To design the compensation circuit, a target crossover frequency fC for close loop must be selected. The system crossover frequency is where control loop has unity gain. The crossover frequency is also called the converter bandwidth. Generally a higher bandwidth means faster response to load transient. However, the bandwidth should not be too high because of system stability concern. When designing the compensation loop, converter stability under all line and load condition must be considered. Usually, it is recommended to set the bandwidth to be less than 1/10 of switching frequency. AOZ1014 operates at a fixed switching frequency range from 350kHz to 600kHz. It is recommended to choose a crossover frequency less than 30kHz.
The zero is a ESR zero due to output capacitor and its ESR. It is can be calculated by:
f Z1 =
1 2 x CO x ESRCO
f C = 30kHz
Where CO is the output filter capacitor; RL is load resistor value; ESRCO is the equivalent series resistance of output capacitor;
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The strategy for choosing RC and CC is to set the cross over frequency with RC and set the compensator zero with CC. Using selected crossover frequency, fC, to calculate RC:
converter circuit can be measured by input power minus output power.
Ptotal _ loss = VIN I IN - VO I O
The power dissipation in Schottky can be approximated as:
RC = f C x
VO 2 x CO x VFB G EA x GCS
where fC is desired crossover frequency; VFB is 0.8V; GEA is the error amplifier transconductance, which is 200* -6 A/V; 10 GCS is the current sense circuit transconductance, which is 9.02 A/V; The compensation capacitor CC and resistor RC together make a zero. This zero is put somewhere close to the dominate pole fp1 but lower than 1/5 of selected crossover frequency. CC can is selected by:
Pdiode _ loss = I O (1 - D ) VFW _ Schottky
Where VFW_Schottky is the Schottky diode forward voltage drop. The power dissipation of inductor can be approximately calculated by output current and DCR of inductor.
Pindcutor _ loss = I O Rinductor 1.1
2
CC =
1 .5 2 x RC x f p1
The actual junction temperature can be calculated with power dissipation in the AOZ1014 and thermal impedance from junction to ambient.
T junction = ( Ptotal _ loss - Pdiode _ loss - Pinductor _ loss ) JA
The maximum junction temperature of AOZ1014 is 150C, which limits the maximum load current capability. Please see the thermal de-rating curves for maximum load current of the AOZ1014 under different ambient temperature. The thermal performance of the AOZ1014 is strongly affected by the PCB layout. Extra care should be taken by users during design process to ensure that the IC will operate under the recommended environmental conditions. The AOZ1014A is standard SO-8 package. The AOZ1014D is a thermally enhanced DFN package, which utilizes the exposed thermal pad at the bottom to spread heat through PCB metal. Several layout tips are listed below for the best electric and thermal performance. Figure 3 below illustrates a PCB layout example of AOZ1014A. Figure 4 below illustrates a PCB layout example of AOZ1014D. 2. Do not use thermal relief connection to the VIN and the PGND pin. Pour a maximized copper area to the PGND pin and the VIN pin to help thermal dissipation. 3. Input capacitor should be connected to the VIN pin and the PGND pin as close as possible. 4. A ground plane is preferred. If a ground plane is not used, separate PGND from AGND and connect them only at one point to avoid the PGND pin noise coupling to the AGND pin.
Equation above can also be simplified to:
CC =
CO x R L RC
An easy-to-use application software which helps to design and simulate the compensation loop can be found at www.aosmd.com. Thermal management and layout consideration In the AOZ1014 buck regulator circuit, high pulsing current flows through two circuit loops. The first loop starts from the input capacitors, to the VIN pin, to the LX pins, to the filter inductor, to the output capacitor and load, and then return to the input capacitor through ground. Current flows in the first loop when the high side switch is on. The second loop starts from inductor, to the output capacitors and load, to the anode of Schottky diode, to the cathode of Schottky diode. Current flows in the second loop when the low side diode is on.
In PCB layout, minimizing the two loops area reduces the noise of this circuit and improves efficiency. A ground plane is strongly recommended to connect input capacitor, output capacitor, and PGND pin of the AOZ1014. In the AOZ1014 buck regulator circuit, the major power dissipating components are the AOZ1014, the Schottky diode and output inductor. The total power dissipation of
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5. Make the current trace from LX pins to L to Co to the PGND as short as possible. 6. Pour copper plane on all unused board area and connect it to stable DC nodes, like VIN, GND or VOUT. 7. The two LX pins are connected to internal PFET drain. They are low resistance thermal conduction path and most noisy switching node. Connected a copper plane to LX pin to help thermal dissipation. This copper plane should not be too larger otherwise switching noise may be coupled to other part of circuit. 8. Keep sensitive signal trace far away form the LX pins. 9. For the DFN package, thermal pad must be soldered to the PCB metal. When multiple layer PCB is used, 4 to 6 thermal vias should be placed on the thermal pad and connected to PCB metal on other layers to help thermal dissipation.
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Vin L Vin Cin PG AG FB LX LX
Vo
Cout EN CP
GND
Via to ground plane
Figure 3. AOZ1014A (SO-8) PCB layout
Thermal PAD: LX Vin L Vin Cin PG AG FB LX LX Cout EN CP Vo
GND Thermal PAD: AGND Via to ground plane
Figure 4. AOZ1014D (DFN-8) PCB layout
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SO-8 Package Marking Description
Z1014AI FAYWLT
DFN-8 Package Marking Description
Z1014DI FAYWLT
Note: Logo Z1014AI F&A Y W L&T
AOS logo Part number code Fab & Assembly location Year code Week code Assembly lot code
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