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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
August 2010
FAN4603 600mA, Fully Integrated, Buck Power Supply Module
Features
Solder and Play DC/DC Converter; No External Components Required Up to 91% Efficiency 600mA Output Current Capability 2.3V to 5.5V Input Voltage Range Fixed Output Voltages from 1.0V to 1.8V 35A PFM Quiescent Current Best-in-Class Load and Line Transient Response 2% PWM DC Voltage Accuracy No External Components Required High-Efficiency, Low-Ripple, Light-Load PFM Thermal Shutdown (TSD), Under-Voltage Lockout, (UVLO), and Short-Circuit (SCP) Protection 4.0 x 2.5mm MLP Package Maximum Height: 1.1mm
Description
The FAN4603 is a fully integrated synchronous DC/DC buck converter that provides up to 600mA of output current over an input voltage ranging from 2.3V to 5.5V. It provides a fixed output voltage level ranging from 1.0V to 1.8V. Other voltage options are available on request. The FAN4603 converter is offered as an ultra-miniature "Solder and Play" solution that requires no external components and is able to achieve a DC accuracy of 2% PWM and an output ripple less than 12mV. Total footprint is 4.0 x 2.5mm with a maximum height of 1.1mm. It can be used in small battery-powered devices and applications with distributed DC POL requirements. At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 35A. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control. In shutdown mode, the supply current drops below 2A, reducing power consumption.
Applications
POL and Distributed DC-DC Module Applications Small Form Factor, Battery-Powered Applications POL Core Power for FPGA, DSP, CPU, and GPU with Fast-Transient, Wide Dynamic Load Requirements Wireless Cards, Meters, Hearing Aids, Bluetooth Headsets, POS Equipment, VOIP, PDAs, MIDs, Netbooks, and Servers
Ordering Information
Part Number
FAN4603MM18X FAN4603MM15X FAN4603MM13X FAN4603MM12X FAN4603MM10X
Output Voltage
1.82V 1.5V 1.3V 1.23V 1.0V
(1)
Package
Temperature Range
Packing
6-Lead Molded Leadless Package (MLP), 4 x 2.5 x 1mm
-40 to 85C
Tape and Reel
Note: 1. Other voltage options are available on request. Contact a Fairchild representative.
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1 www.fairchildsemi.com
FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Typical Application
Figure 1. Typical Application
Pin Configuration
Figure 2. MLP 4.0 x 2.5 mm (Top View)
Figure 3. 3D Package View
Pin Definitions
Pin #
1 2 3 4 5 6 P1
Name
VIN EN SW VOUT FB GND GND
Description
Input Voltage. Connect to input power source Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V. Do not leave this pin floating. Switching Node. Leave this pin floating. Output Voltage. Connect to Load. Feedback/VOUT. This pin must be shorted directly to VOUT (Pin 4). Ground. Power and IC ground. All signals are referenced to this pin. Optional Ground Connection. Not typically used.
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
2
FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
VIN TJ TSTG TL ESD
Parameter
Input Voltage with Respect to GND Voltage on Any Other Pin with Respect to GND Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 Seconds) Electrostatic Discharge Capability Human Body Model JESD22-A114 Charged Device Model, JESD22-C101
Min.
-0.3 -0.3 -40 -65 6 2
Max.
6.0 VIN +150 +150 +260
Units
V V C C C kV
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
VCC IOUT TA TJ Supply Voltage Range Output Current
Parameter
Min.
2.3 0 -40 -40
Max.
5.5 600 +85 +125
Units
V mA C C
Operating Ambient Temperature Operating Junction Temperature
Thermal Properties
Symbol
JA
Parameter
Junction-to-Ambient Thermal Resistance
(2)
Typical
120
Units
C/W
Note: 2. Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with a twolayer 2s0p board in accordance to the JESD51- JEDEC standard. Special attention must be paid not to exceed junction temperature TJ(max) at a given ambient temperature TA.
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
3
FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Electrical Specifications
Unless otherwise noted, VIN = 2.5 to 5.5V, EN = VIN. TA = -40C to +85C, using circuit of Figure 1. Typical values are at 3.6VIN, TA = 25C.
Symbol
Power Supplies IQ ISD VUVLO VUVHYST VENH VENL VEN_HYS IEN Oscillator fOSC Regulation
Parameter
Quiescent Current Shutdown Supply Current Under-Voltage Lockout Threshold Under-Voltage Lockout Hysteresis Enable HIGH-Level Input Voltage Enable LOW-Level Input Voltage Enable Logic Input Hysteresis Enable Input Leakage Current
Conditions
Min.
Typ.
35
Max.
55 2.0 2.25
Units
A A V mV V
VIN = 3.6V, EN = GND Rising VIN
0.1 2.15 150 1.05
0.4 100 EN = VIN or GND 0.01 1.00
V mV A
Oscillator Frequency(3)
PWM Mode
5.4
6.0
6.6
MHz
1.82V
ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode ILOAD = 0 to 600mA PWM Mode Rising EN to VOUT Regulation
1.784 1.784 1.470 1.470 1.274 1.274 1.207 1.207 0.975 0.975
1.820 1.820 1.500 1.500 1.300 1.300 1.233 1.233 1.000 1.000 180
1.890 1.856 1.560 1.530 1.352 1.326 1.283 1.260 1.050 1.025 300 s V
1.50V
VO
Output Voltage Accuracy
1.30V
1.23V
1.00V tSS Protection ILIM TTSD THYS Peak Input Current Limit Thermal Shutdown Thermal Shutdown Hysteresis Soft-Start Time
850
1050 +150 +15
1250
mA C C
Note: 3. PWM frequency may be lower than specified when limited by tON-min (minimum on-time) or tOFF_min (minimum off-time), at duty cycle extremes, but output regulation is maintained.
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25C,VIN = VEN
100% VIN=3.7V 90%
100%
1.82VOUT 1.5VOUT
90%
VIN=5V
1.3VOUT 1.23VOUT
Efficiency
Efficiency
80%
80%
1.0VOUT
70%
1.82VOUT 1.5VOUT 1.3VOUT
70%
60%
1.23VOUT 1.0VOUT
60%
50% 1 10 100 1000
50% 1 10 100 1000
Output Current (mA)
Output Current (mA)
Figure 4. Efficiency, VIN=3.7V
100%
100%
Figure 5. Efficiency, VIN=5V
90%
90%
Efficiency
Efficiency
80%
80%
70%
2.5VIN 3.3VIN
70%
3.3VIN, -40C 3.3VIN, +85C
60%
3.7VIN 5.0VIN
60%
5.0VIN, -40C 5.0VIN, +85C
50% 1 10 100 1000
50% 1 10 100 1000
Output Current (mA)
Output Current (mA)
Figure 6. 1.82VOUT Efficiency
40
Figure 7. 1.82 VOUT Efficiency Over Temperature
75
2.5VIN
Output Ripple (mVp-p)
30
3.3VIN 3.7VIN
60
2.5VIN 3.3VIN 5VIN 5.0Vin, 2.2uF
Vout Error (mV)
20
5.0VIN
45
30
10
15
0
0 0
-10 0 100 200 300 400 500 600
100
200
300
400
500
600
Load Current (mA)
Output Current (mA)
Figure 8. 1.82VOUT Regulation (Normalized)
Figure 9. 1.82VOUT Output Ripple with Optional 2.2F COUT (1.5F Actual)
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25C,VIN = VEN
40 100%
3.3VIN
30
3.3VIN, 2.2uF 5.0VIN
90%
Vout Error (mV)
Efficiency
20
5.0VIN, 2.2uF
80%
10
70%
2.5VIN 3.3VIN
0 60%
3.7VIN 5.0VIN
-10 0 100 200 300 400 500 600
50% 1 10 100 1000
Output Current (mA)
Output Current (mA)
Figure 10. 1.82VOUT Regulation (Normalized) with Optional 2.2F COUT (1.5F Actual)
20
Figure 11. 1.23 VOUT Efficiency
100%
90%
15
2.5VIN 3.3VIN
Vout Error (mV)
10
3.7VIN 5.0VIN
Efficiency
80%
5
70%
3.3VIN, -40C 3.3VIN, +85C
0
60%
5.0VIN, -40C 5.0VIN, +85C
-5
50% 1 10 100 1000
-10 0 100 200 300 400 500 600
Output Current (mA)
Output Current (mA)
Figure 12.
1.23VOUT Efficiency Over Temperature
Figure 13.
1.23VOUT Regulation (Normalized)
Figure 14.
1.82VOUT PFM / PWM Boundary
Figure 15.
1.23VOUT PFM / PWM Boundary
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
6
FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25C,VIN = VEN
Figure 16. Quiescent Current Over Temperature (EN=VIN) Figure 17.
Shutdown Current Over Temperature (EN=0V)
Figure 18. 1.82VOUT Startup, 3.7VIN, No Load
Figure 19.
1.82VOUT Startup, 3.7VIN, 3.6 Load
Figure 20. 1.82VOUT Startup into Pre-Charged Output, 3.7VIN, 300mA Load
Figure 21.
Over-Current Protection, 300mA Load Transition to 300m Fault
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Typical Performance
Unless otherwise specified, VIN = 3.7V, TA = 25C,VIN = VEN
Figure 22.
1.82VOUT Load Transient, 10-160mA, tR/tF=100ns
Figure 23. 1.82VOUT Load Transient, 150-500mA, tR/tF=100ns
Figure 24. 1.82VOUT Load Transient, 10-160mA, tR/tF=100ns with Optional 2.2F COUT
Figure 25. 1.82VOUT Load Transient, 150-500mA, tR/tF=100ns with Optional 2.2F COUT
Figure 26. 1.82VOUT Line Transient, 3.6-4.2VIN, tR/tF=10s, with 10mA Load
Figure 27. 1.82VOUT Line Transient, 3.6-4.2VIN, tR/tF=10s, with 300mA Load
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Operation Description
The FAN4603 is a 600mA, step-down, switching-voltage regulator that delivers a fixed output from an input voltage supply of 2.3V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN4603 is capable of delivering a peak efficiency of >90%, while maintaining efficiency over 80% at load currents as low as 1mA. The regulator operates at a nominal PWM frequency of 6MHz. To prevent shutdown during soft-start, the following condition must be met:
IDISP + ILOAD < IMAX(DC)
(2)
where IMAX(DC) is the maximum load current the IC is guaranteed to support (600mA). Table 1 shows combinations of external COUT that allow the IC to start successfully with the minimum RLOAD that can be supported at each. Table 1. Minimum RLOAD Values for Soft-Start with Various External COUT Values
Control Scheme
The FAN4603 uses a proprietary, non-linear, fixed-frequency PWM modulator to deliver a fast load transient response, while maintaining a constant switching frequency over a wide range of operating conditions. Regulator stability is not dependent on output capacitor ESR, which allows the use of ceramic capacitors. Although this type of operation normally results in a switching frequency that varies with input voltage and load current, an internal frequency loop holds the switching frequency constant over a large range of input voltages and load currents. For very light loads, FAN4603 incorporates a discontinuous current (DCM) single-pulse PFM mode, which produces lower output ripple when compared with other PFM architectures. Transition between PWM and PFM is seamless, with a glitch of less than 20mV at VOUT during the transition between DCM and CCM modes. Combined with exceptional transient response characteristics, the very low quiescent current of the controller (35A) maintains high efficiency; even at very light loads, while preserving fast transient response for applications requiring tight output regulation.
COUT
2.2F, 0402 4.7F, 0402 10F, 0603
Minimum RLOAD
VOUT / 0.55 VOUT / 0.50 VOUT / 0.45
Multiple soft-start cycles may be required for COUT>10f (15f with no load). The IC shuts down for 85s when IDISP+ ILOAD exceeds ILIMIT for more than 21s of current limit. The IC then begins a new soft-start cycle. Subsequent soft-start cycles begin with any charge retained by COUT while the IC is off, allowing VOUT to incrementally reach regulation over multiple soft-start attempts.
Current Limit, Fault Shutdown, and Restart
A heavy load or short circuit on the output causes the current to increase until a maximum current threshold is reached. Upon reaching this point, the high-side switch turns off, preventing high currents from causing damage. The regulator continues to limit the current cycle-by-cycle. After 21s of current limit, the regulator triggers an over-current fault, causing the regulator to shut down for about 85s before attempting an automatic restart. If the fault is caused by short circuit, the soft-start circuit attempts to restart and produces an over-current fault after about 32s, which results in a duty cycle of less than 30%, limiting power dissipation.
Enable and Soft-Start
When EN is LOW, all circuits in FAN4603 are off and the IC draws ~100nA of current. When EN is HIGH and VIN is above its UVLO threshold, the regulator begins a soft-start cycle. The output ramp during soft-start is a fixed slew rate of 50mV/s from 0 to 1 VOUT, then 12.5mV/s until the output reaches its setpoint. PWM mode operation is prohibited during the soft-start cycle to prevent COUT from being discharged. This allows glitchless starting into a pre-charged output.
Under-Voltage Lockout (UVLO)
When EN is HIGH, the under-voltage lockout keeps the part from operating until the input supply voltage rises high enough to properly operate. This ensures no misbehavior of the regulator during startup or shutdown.
Startup into Large COUT
The IC may fail to start if heavy load is applied during startup and a large external COUT is present. This is due to the current-limit fault response, which protects the IC in an overcurrent condition during soft-start. The current required to charge COUT during soft-start, referred to as "displacement current," is given as:
IDISP = C OUT * dV dt
Thermal Shutdown
When the die temperature increases, due to a high load condition and/or a high ambient temperature, the output switching is disabled until the temperature on the die has fallen sufficiently. The junction temperature at which the thermal shutdown activates is nominally 150C with 15C hysteresis. After cooling, the IC automatically restarts, with a soft-start cycle.
(1)
where
dV refers to the soft-start slew rate. dt
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Reducing PFM Output Ripple
PFM output ripple amplitude can be reduced by adding external COUT, with negligible impact on efficiency. Reduced output ripple also results in less DC voltage excursion at very light loads. Maximum PFM ripple occurs at no load and is VIN and VOUT proportional.
PCB Layout Guideline
Figure 29. Figure 28. Typical 1.82VOUT No Load PFM Ripple vs. VIN Note: 4. Ripple is less for lower VOUT levels. The effective value of external COUT for a desired ripple amplitude can be determined using:
( V - VOUT ) * VOUT * 62 -1 C OUT. (F) = IN VIN * VR
Recommended PCB Layout
FB (pin 5) must be directly connected to VOUT (pin 4). Figure 29 shows the recommended locations of optional CIN and COUT, shown as 0603 size devices. Pad P1, shown in Figure 30 "Land Pattern," is an optional GND pin. Connection is not required on the PCB.
(3)
where VR is the desired output ripple amplitude in mV and VIN and VOUT are in Volts. The simplified equation above is representative of nominal component values and does not account for device tolerances. The bias level effects associated with case size, voltage rating, and dielectric type of ceramic capacitors should be considered when selecting COUT.
Minimum Off-Time Effect on Switching Frequency
tOFF(MIN) is 50ns, while tON(MIN) is 35nS This imposes V constraints on the maximum/minimum OUT that the VIN FAN4603 can provide while maintaining a fixed switching frequency in PWM mode. When VIN is LOW, fixed switching is maintained as long as VOUT 1 - tOFF ( MIN ) * fSW 0.7 . VIN When VIN is HIGH, fixed switching is maintained as long as
VOUT t ON ( MIN ) * f SW 0.2 V IN
The switching frequency drops when the regulator cannot provide sufficient duty cycle at 6MHz to maintain regulation. Lowering the switching frequency allows VOUT to remain in regulation, even at very low or very high duty cycle.
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
Physical Dimensions
C L A
P1 0.95
B
0.05 A
2X
2.50 0.13 0.50
0.25 0.95 0.32
6
PIN A1 MARK C L
1
6
3.70 4.00 1.10
1
1.45 0.10
C L
0.78 0.40
3 4
0.50 1.45
3
4
1.30 0.05 B
0.30
C L
2X
0.63 0.80 2.70
LAND PATTERN RECOMMENDATION
1.10 0.90
TOP VIEW
0.10 C
0.05 0.00
0.08 C
SEATING PLANE
C
2.50 0.85 0.65
C L
P1
1.20
C L
3
4
1.45 1.35
0.50 0.30 1.25 1.15
0.68 5 0.48
2 1 6
NOTES: A) THIS PACKAGE IS NOT PRESENTLY REGISTERED WITH ANY STANDARDS COMMITTEE. B) DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE INCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR PROTRUSIONS. D) DRAWING CONFORMS TO ASME Y14.5M-1994 E) DRAWING FILENAME: MKT-MOD06AArev3
0.40 0.15
4.00
(0.40)
PIN A1 MARK
0.23 (0.25) BOTTOM VIEW
Figure 30. 6-Lead, MicroModule QFN 2.5 x 4 x 1mm
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/.
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
11
FAN4603 -- 600mA, Fully Integrated Buck Power Supply Module
(c) 2009 Fairchild Semiconductor Corporation FAN4603 * Rev. 1.0.1
www.fairchildsemi.com
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