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AOZ1321DI
Load Switch with Controlled Slew Rate
General Description
The AOZ1321DI is a P-channel high-side load switch with controlled slew rate. Three slew rate options are available. The AOZ1321DI-01L and AOZ1321DI-04L have slew rates of 800us. The AOZ1321DI-02L and AOZ1321DI -05L feature fast Slew Rate (less than 1s). The slew rate of AOZ1321DI-03L and AOZ1321DI-06L is 100s. The AOZ1321DI-03L, AOZ1321DI-04L, and AOZ1321DI-05L provide an output discharge circuit to quickly discharge the output when the switch is disabled. The P-channel MOSFET has typical on resistance of 60m. The very low RDS(ON) significantly reduces the power path dissipation. The input voltage range of AOZ1321DI is from 1.6V to 5.5V. The control input is compatible with both TTL and CMOS logic. Ultra low quiescent current makes this product suitable for any portable applications. The AOZ1321DI is available in 4-pin 1.2x1.6 DFN package and is rated over the -40C to +85C ambient temperature range.
Features

1.6V to 5.5V input voltage range Low RDS(ON) (60m typical at 5V) Controlled turn-on slew rate 800s (AOZ1321DI-01L, -04L) 100s (AOZ1321DI-03L, -06L) 1s (AOZ1321DI-02L, -05L) Output discharge function (-03L, -04L, -05L) Low quiescent current (1.0A typical) Low shutdown current (<1A) 4kV ESD Rating Tiny 1.2x1.6 DFN package

Applications

Cellular phones MP3 players Personal media players Notebook computers Digital still cameras Hot-swap applications
Typical Application
VIN IN
C1
VOUT OUT
AOZ1321DI
EN
R1
C2 1F/10F
OFF ON
GND
Rev. 1.1 August 2008
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Page 1 of 15
AOZ1321DI
Ordering Information
Part Number
AOZ1321DI-04L AOZ1321DI-01L AOZ1321DI-05L AOZ1321DI-02L AOZ1321DI-03L AOZ1321DI-06L
Slew Rate
800s 800s 1s 1s 100s 100s
Output Discharge
Yes No Yes No Yes No
Package
Environmental
1.2 x 1.6 DFN-4
Green Product
* All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards. * Parts marked as Green Products (with "L" suffix) use reduced levels of Halogens, and are also RoHS compliant. Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Pin Configuration
VOUT 1 Pad is GND GND 2 DFN-4 1.2mm x 1.6mm
(Top View)
4
EN
3
VIN
Pin Description
Pin Name
IN GND OUT EN
Pin Number
3 2 1 4 Ground.
Pin Function
Input. IN is the drain of the P-channel MOSFET. It is the supply input of the IC. Output. OUT is the source of the P-channel MOSFET. Enable. The P-channel MOSFET turns on when EN is logic HIGH.
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the device.
Recommend Operating Ratings
Rating
6V 6V 2A 1.4A 6A -50mA -55C to +150C 4kV
The device is not guaranteed to operate beyond the Maximum Operating Ratings.
Parameter
Input Voltage (VIN) Enable Voltage (VIN) Continuous Drain Current (ID) TA = 25C TA = 85C Pulsed Drain Current (IDP) Continuous Diode Current (IS) Storage Temperature (TS) ESD Rating(1)
Parameter
Input Voltage (VIN) Junction Temperature (TJ) Package Thermal Resistance 1.2 x 1.6 DFN-4 (JA) 1.2 x 1.6 DFN-4 (JC)
Rating
1.6V to 5.5V -40C to +125C 143.17C/W 128.1C/W
Note: 1. Devices are inherently ESD sensitive, handling precautions are required. Human body model is a 100pF capacitor discharging through a 1.5k resistor.
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AOZ1321DI
Electrical Characteristics
TA = 25C, VIN = VEN = 5V, unless otherwise specified.
Symbol
VEN_TH IIN
Parameter
Enable Threshold Voltage Quiescent Supply Current AOZ1321DI -02L/05L AOZ1321DI -01L/03L/04L/06L
Conditions
VIN = 1.6V to 4.5V, ID = -250uA VIN = VEN = 5.5V VIN = +5.5V, VEN = 0V VIN = 5.0V, ID = -100mA, VEN = 1.5V VIN = 4.5V, ID = -100mA, VEN = 1.5V VIN = 3.6V, ID = -100mA, VEN = 1.5V VIN = 2.5V, ID = -100mA, VEN = 1.5V VIN = 1.8V, ID = -100mA, VEN = 1.5V VIN = 1.7V, ID = -100mA, VEN = 1.5V VIN = 1.6V, ID = -100mA, VEN = 1.5V
Min.
0.3
Typ.
Max.
1.2
Units
V A A
1 1.6 60
62 65 75 95 101 114
3 3 1
85 90 95 120 180 195 223
IOFF RDS(ON)
OFF State Leakage Current Switch On-Resistance
m
RSHUTDOWN TD(ON) TR TD(OFF) TF TD(ON) TR TD(OFF) TF TD(ON) TR TD(OFF) TF TD(ON) TR TD(OFF) TF TD(ON) TR TD(OFF) TF TD(ON) TR TD(OFF) TF
Turn-Off Resistance
VIN = 3.6V, ITEST = 1mA, VEN = 0V
162 1.3
220 2.5 4.0 200 100 2.5 4.0 200 100 700 1500 200 100 700 1500 200 100 220 200 200 100 220 200 200 100
s s ns ns s s ns ns s s ns ns s s ns ns s s ns ns s s ns ns
AOZ1321DI-05L (TR = 1s with Output Discharge) Output Turn-on delay Output Rise-time Output Turn-off delay Output Fall-time VIN = 3.6V, ID = -100mA, VEN = 1.5V
0.5
1.7 100 20 1.3
AOZ1321DI-02L (TR = 1s without Output Discharge) Output Turn-On Delay Output Rise-time Output Turn-Off Delay Output Fall-time VIN = 3.6V, ID = -100mA, VEN = 1.5V
0.5
1.7 100 20 320
AOZ1321DI-04L (TR = 800s with Output Discharge) Output Turn-On Delay Output Rise Time Output Turn-Off Delay Output Fall-time VIN = 3.6V, ID = -100mA, VEN = 1.5V
500
800 60 20 320
AOZ1321DI-01L (TR = 800s without Output Discharge) Output Turn-On Delay Output Rise Time Output Turn-Off Delay Output Fall-time VIN = 3.6V, ID = -100mA, VEN = 1.5V
500
800 60 20 120
AOZ1321DI-03L (TR = 100s with Output Discharge) Output Turn-On Delay Output Rise Time Output Turn-Off Delay Output Fall-time VIN = 3.6V, ID = -100mA, VEN = 1.5V
50
100 110 20 120
AOZ1321DI-06L (TR = 100s without Output Discharge) Output Turn-On Delay Output Rise Time Output Turn-Off Delay Output Fall-time VIN = 3.6V, ID = -100mA, VEN = 1.5V
50
100 110 20
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AOZ1321DI
Typical Operating Characteristics
RDS(ON) Variance with Temperature
90 Vds = 3.6V, Id = 0.1A 85 80 RDS(ON) (M) 75 70 65 60 55 50 -40 EN Threshold Votlage (V) 0.9 1 VIH, Id = -250uA VIL, Id = -250uA
EN Threshold Voltage vs. Input Voltage
0.8
0.7
0.6
0.5
0.4 -20 0 20 40 60 80 100 120 140 160 1.5 2.5 Temperature (C) 3.5 Input Voltage (V) 4.5 5.5
ON Resistance vs. Input Voltage
120 110 100 RDS(ON) (M) VDROP) (mV) 90 80 70 60 50 50 1.5 2.5 3.5 Input Voltage (V) 4.5 5.5 0 0 IL = 1.2A IL = 0.9A IL = 0.1A 500 450 400 350 300 250 200 150 100
ON Resistance vs. Input Voltage
Vin=1.8V Vin=2.5V Vin=4.5V
0.5
1 1.5 2 Load Current (A)
2.5
3
Turn-on Delay vs. Input Voltage (AOZ1321DI-02L/05L)
12 8 7 6 Rise Time (s) 8 Turn-On (s) 5 4 3 2 2 1 0 1.5 0 1.5
Rise Time vs. Input Voltage (AOZ1321DI-02L/05L)
10
6
4
2
2.5
3 3.5 Input Voltage (V)
4
4.5
5
2
2.5
3 3.5 Input Voltage (V)
4
4.5
5
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AOZ1321DI
Typical Operating Characteristics (Continued)
Turn-off Delay vs. Input Voltage (AOZ1321DI-02L/05L)
200 180 160 Fall Time (s) Turn-Off (s) 140 120 100 80 60 10 40 20 0 1.5 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5 5 0 1.5 30 25 20 15 40 35
Fall Time vs. Input Voltage (AOZ1321DI-02L/05L)
2
2.5
3 3.5 Input Voltage (V)
4
4.5
5
Turn-on Delay vs. Input Voltage (AOZ1321DI-01L/04L)
450 400 350 Turn-On (s) 300 250 200 150 100
Rise Time vs. Input Voltage (AOZ1321DI-01L/04L)
1200
1000
Rise Time (s) 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5
800
600
400
200 50 0 1.5 0 1.5 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5
Turn-off Delay vs. Input Voltage (AOZ1321DI-01L/04L)
180 160 140 45 40 35
Fall Time vs. Input Voltage (AOZ1321DI-01L/04L)
Turn-Off (s)
100 80 60 40 20 0
Fall Time (s) 1.5 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5
120
30 25 20 15 10 5 0
1.5
2
2.5
3 3.5 Input Voltage (V)
4
4.5
5
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AOZ1321DI
Typical Operating Characteristics (Continued)
Turn-on Delay vs. Input Voltage (AOZ1321DI-03L/06L)
350 300 250
Rise Time (s) Turn-on (s)
Rise Time vs. Input Voltage (AOZ1321DI-03L/06L)
120
100
80
200 150 100 50 0
1.5 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5
60
40
20
0
1.5 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5
Turn-off Delay vs. Input Voltage (AOZ1321DI-03L/06L)
300 50 45 250 40 35
Fall Time (s)
Fall Time vs. Input Voltage (AOZ1321DI-03L/06L)
Turn-off (s)
200
30 25 20 15 10 5
150
100
50
0 1.5
0 2 2.5 3 3.5 Input Voltage (V) 4 4.5 5 1.5 2 2.5 3 3.5 4 Input Voltage (V) 4.5 5
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AOZ1321DI
Functional Characteristics
AOZ1321DI-02L, AOZ1321DI-05L Turn-On Timing
ENABLE 2V/div ENABLE 2V/div VOUT 2V/div
Turn-Off Timing
VOUT 2V/div
IOUT 500mA/div
IOUT 100mA/div
Time: 4s/div
Time: 40s/div
Turn-On Timing
ENABLE 2V/div ENABLE 2V/div VOUT 2V/div
Turn-Off Timing
VOUT 2V/div
IOUT 2A/div
IOUT 100mA/div
Time: 10s/div
Time: 400s/div
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AOZ1321DI
Functional Characteristics (Continued)
AOZ1321DI-01L, AOZ1321DI-04L Turn-On/Turn-Off Timing Turn-Off Timing
ENABLE 2V/div
ENABLE 2V/div
VOUT 2V/div IOUT 100mA/div
VOUT 2V/div
IOUT 100mA/div
Time: 1ms/div
Time: 40s/div
Turn-On/Turn-Off Timing
Turn-Off Timing
ENABLE 2V/div
ENABLE 2V/div
VOUT 2V/div
VOUT 2V/div
IOUT 100mA/div
IOUT 100mA/div
Time: 1ms/div
Time: 400s/div
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AOZ1321DI
Functional Characteristics (Continued)
AOZ1321DI-03L, AOZ1321DI-06L Turn-On/Turn-Off Timing Turn-Off Timing
ENABLE 2V/div
ENABLE 2V/div
VOUT 2V/div
VOUT 2V/div
IOUT 100mA/div
IOUT 100mA/div
Time: 1ms/div
Time: 40s/div
Turn-On/Turn-Off Timing
Turn-Off Timing
ENABLE 2V/div
ENABLE 2V/div
VOUT 2V/div
VOUT 2V/div
IOUT 100mA/div
IOUT 100mA/div
Time: 1ms/div
Time: 400s/div
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AOZ1321DI
Timing Diagram
VIH
EN
90%
VIL 90%
OUT TD(ON)
10%
TD(OFF) TR
Figure 1. AOZ1321 Timing Diagram
Functional Block Diagram
IN
OUT
Gate Driver & Slew Rate Control
EN
160
AOZ1321DI
GND
Figure 2. Functional Block Diagram
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Page 10 of 15
AOZ1321DI
Detailed Description
Internal Discharge Resistor The AOZ1321DI has an internal 160 resistor to discharge any remaining voltage from the system to the ground that is store in a capacitive load. This provides a safe shutdown of the system to prevent any damages to the devices. This function is controlled from the Enable pin. Slew Rate Control The AOZ1321DI is a family of P-channel high-side load switches with controlled slew rate. The device is enabled when the EN pin is high. Once enabled, the gate driver and slew-rate control circuitry immediately raises the source-to-gate voltage of the P-channel MOSFET to its threshold level, and then gradually turns on the MOSFET by linearly increasing the source-to-gate voltage. This slow turn-on action effectively limits the input inrush current and provides a nice ramp for the output voltage. After the MOSFET is fully enhanced, the AOZ1321DI quickly increases the source-to-gate voltage to the full input voltage to minimize on resistance and reduce power dissipation. Three slew-rate options are available. AOZ1321DI-01L and AOZ1321DI-04L have slew rate of 800us. This option significantly reduces the inrush current when the MOSFET turns on, allowing the use of very small input capacitor. AOZ1321DI-02L and -05L have no slew rate control and the MOSFET can be turned on within 1us. This option is suitable for applications that require very fast switching. AOZ1321DI-03L and -06L have moderate slew rate to 100s. The AOZ1321DI-03L, -04L and -05L options include an internal output discharge circuit that quickly discharges the output to ground when the device is disabled. On/Off Control The AOZ1321DI is enabled when the EN pin is asserted high. The device is disabled when the EN pin is asserted low. The EN input is compatible with both TTL and CMOS logic.
Applications Information
Input Capacitor Selection Use a 1F or larger capacitor for input bypassing. Place the capacitor close to the IN pins of AOZ1321DI. Output Capacitor Selection Use a 0.1F or larger capacitor between OUT and GND. The capacitance does not affect the turn-on slew rate. However, a larger capacitor makes the initial turn-on transient smoother.
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AOZ1321DI
Layout Guidelines
Good PCB is important for improving the thermal performance of AOZ1321DI. Place the input and output bypass capacitors close to the IN and OUT pins. The input and output PCB traces should be as wide as possible for the given PCB space. Use a ground plane to enhance the power dissipation capability of the device. The AOZ1321DI evaluation board can be used as a layout example. The PCB layout of AOZ1321DI evaluation board is shown in Figure 3.
Figure 3. AOZ1321DI PCB Layout
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AOZ1321DI
Package Dimensions, DFN 1.2 x 1.6 4L
Pin 1 Dot
E E1 b D D1
Pin #1 ID R0.100
Seating Plane A3 A1 A
e Exposed Pad
TOP VIEW
BOTTOM VIEW
SIDE VIEW
Dimensions in millimeters
RECOMMENDED LAND PATTERN
1.30 0.65 Symbols A A1 A3 b E E1 D 0.30 0.55 0.50 UNIT: mm 0.40 D1 e L aaa bbb ccc Min. 0.50 0 Nom. Max. 0.55 0.60 -- 0.05 0.152 REF. 0.20 0.25 0.30 1.55 1.60 1.65 0.45 0.50 0.55 1.15 1.20 1.25 0.81 0.86 0.91 0.5 BSC 0.30 0.35 0.40 -- -- -- 0.15 0.10 0.10 -- -- --
Dimensions in inches
Symbols A A1 A3 b E E1 D D1 e L aaa bbb ccc Min. Nom. Max. 0.020 0.022 0.024 0 -- 0.002 0.006 REF. 0.008 0.010 0.012 0.061 0.063 0.065 0.018 0.020 0.022 0.045 0.047 0.049 0.032 0.034 0.036 0.020 BSC 0.012 0.014 0.016 -- -- -- 0.006 0.004 0.004 -- -- --
0.86
0.275
Notes: 1. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 2. Coplanarity ccc applies to the terminals and all other bottom surface metallization.
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AOZ1321DI
Tape and Reel Dimensions, DFN 1.2 x 1.6 4L
Carrier Tape
P1 K0 B0 E2 E P2 D0
D1
E1
5 T P0 A0 5
E3 Feeding Direction
B-B' Section
UNIT: mm
A-A' Section
B0 1.78 0.05 A0 1.38 0.05 K0 0.78 0.05 D0 D1 E o1.5 o0.6 8.00 0.10 0.05 +0.30/-0.10 E1 1.75 0.10 E2 3.50 0.05 P0 4.00 0.10 P1 4.00 0.10 P2 2.00 0.05
Package T DFN 1.2x1.6 0.254 0.02
Reel
65
45
W1 S
K M E N
Section: A-A'
UNIT: mm
Section: B-B'
H Arbor Hole Detail A Scale 2:1
Front View
Tape Size Reel Size 8mm o149
M o179.0 0.50
N o55.0 0.5
W 8.4 +1.5/-0.0
W1 14.4 Max.
H o13.0 +0.5/-0.2
S 1.5 Min.
K 10.1 Min.
E 2.70 0.2
Leader / Trailer & Orientation
Trailer Tape 300mm Min.
Components Tape Orientation in Pocket
Leader Tape 500mm Min.
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AOZ1321DI
Package Marking
DFN 1.2 x 1.6
$P $W $L
Part Number Code Underline Denotes Green Product Week Lot Number
Alpha & Omega Semiconductor reserves the right to make changes at any time without notice. LIFE SUPPORT POLICY ALPHA & OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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