Rev. 1.1 August 2008
www.aosmd.com
Page 1 of 15
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 1µs).
The slew rate of AOZ1321DI-03L and AOZ1321DI-06L is
100µs. 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
Ω
. The very low R
DS(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 -40°C to +85°C ambient
temperature range.
Features
●
1.6V to 5.5V input voltage range
●
Low R
DS(ON)
(60m
Ω
typical at 5V)
●
Controlled turn-on slew rate
◗
800µs (AOZ1321DI-01L, -04L)
◗
100µs (AOZ1321DI-03L, -06L)
◗
1µs (AOZ1321DI-02L, -05L)
●
Output discharge function (-03L, -04L, -05L)
●
Low quiescent current (1.0µA typical)
●
Low shutdown current (<1µA)
●
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
OUT
VIN VOUT
IN
EN GND
C2
1µF/10µF
C1
R1
OFF ON
AOZ1321DI
AOZ1321DI
Rev. 1.1 August 2008
www.aosmd.com
Page 2 of 15
Ordering Information
• 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
Pin Description
Part Number Slew Rate Output Discharge Package Environmental
AOZ1321DI-04L 800µs Yes
1.2
x
1.6 DFN-4 Green Product
AOZ1321DI-01L 800µs No
AOZ1321DI-05L 1µs Yes
AOZ1321DI-02L 1µs No
AOZ1321DI-03L 100µs Yes
AOZ1321DI-06L 100µs No
Pin Name Pin Number Pin Function
IN 3 Input. IN is the drain of the P-channel MOSFET. It is the supply input of the IC.
GND 2 Ground.
OUT 1 Output. OUT is the source of the P-channel MOSFET.
EN 4 Enable. The P-channel MOSFET turns on when EN is logic HIGH.
1
2
EN
VIN
4
3
VOUT
GND
Pad is
GND
DFN-4 1.2mm x 1.6mm
(Top View)
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the device.
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model is a 100pF capacitor discharging
through a 1.5k
Ω
resistor.
Recommend Operating Ratings
The device is not guaranteed to operate beyond the Maximum
Operating Ratings.
Parameter Rating
Input Voltage (V
IN
)6V
Enable Voltage (V
IN
)6V
Continuous Drain Current (I
D
)
T
A
= 25°C
T
A
= 85°C
±2A
±1.4A
Pulsed Drain Current (I
DP
) ±6A
Continuous Diode Current (I
S
) –50mA
Storage Temperature (T
S
) –55°C to +150°C
ESD Rating
(1)
4kV
Parameter Rating
Input Voltage (V
IN
) 1.6V to 5.5V
Junction Temperature (T
J
) -40°C to +125°C
Package Thermal Resistance
1.2 x 1.6 DFN-4 (
Θ
JA
)
1.2 x 1.6 DFN-4 (
Θ
JC
)
143.17°C/W
128.1°C/W
Rev. 1.1 August 2008
www.aosmd.com
Page 3 of 15
AOZ1321DI
Electrical Characteristics
T
A
= 25°C, V
IN
= V
EN
= 5V, unless otherwise specified.
Symbol Parameter Conditions Min. Typ. Max. Units
V
EN_TH
Enable Threshold Voltage V
IN
= 1.6V to 4.5V, I
D
= –250uA 0.3 1.2 V
I
IN
Quiescent Supply Current
AOZ1321DI -02L/05L V
IN
= V
EN
= 5.5V 13µA
AOZ1321DI -01L/03L/04L/06L 1.6 3
I
OFF
OFF State Leakage Current V
IN
= +5.5V, V
EN
= 0V 1µA
R
DS(ON)
Switch On-Resistance V
IN
= 5.0V, I
D
= –100mA, V
EN
= 1.5V 60 85
m
Ω
V
IN
= 4.5V, I
D
= –100mA, V
EN
= 1.5V 62 90
V
IN
= 3.6V, I
D
= –100mA, V
EN
= 1.5V 65 95
V
IN
= 2.5V, I
D
= –100mA, V
EN
= 1.5V 75 120
V
IN
= 1.8V, I
D
= –100mA, V
EN
= 1.5V 95 180
V
IN
= 1.7V, I
D
= –100mA, V
EN
= 1.5V 101 195
V
IN
= 1.6V, I
D
= –100mA, V
EN
= 1.5V 114 223
R
SHUTDOWN
Tu r n-Off Resistance V
IN
= 3.6V, I
TEST
= 1mA, V
EN
= 0V 162 220
Ω
AOZ1321DI–05L (T
R
= 1µs with Output Discharge)
T
D(ON)
Output Turn-on delay
V
IN
= 3.6V, I
D
= –100mA, V
EN
= 1.5V
1.3 2.5 µs
T
R
Output Rise-time 0.5 1.7 4.0 µs
T
D(OFF)
Output Turn-off delay 100 200 ns
T
F
Output Fall-time 20 100 ns
AOZ1321DI–02L (T
R
= 1µs without Output Discharge)
T
D(ON)
Output Turn-On Delay
V
IN
= 3.6V, I
D
= –100mA, V
EN
= 1.5V
1.3 2.5 µs
T
R
Output Rise-time 0.5 1.7 4.0 µs
T
D(OFF)
Output Turn-Off Delay 100 200 ns
T
F
Output Fall-time 20 100 ns
AOZ1321DI–04L (T
R
= 800µs with Output Discharge)
T
D(ON)
Output Turn-On Delay
V
IN
= 3.6V, I
D
= –100mA, V
EN
= 1.5V
320 700 µs
T
R
Output Rise Time 500 800 1500 µs
T
D(OFF)
Output Turn-Off Delay 60 200 ns
T
F
Output Fall-time 20 100 ns
AOZ1321DI–01L (T
R
= 800µs without Output Discharge)
T
D(ON)
Output Turn-On Delay
V
IN
= 3.6V, I
D
= –100mA, V
EN = 1.5V
320 700 µs
TROutput Rise Time 500 800 1500 µs
TD(OFF) Output Turn-Off Delay 60 200 ns
TFOutput Fall-time 20 100 ns
AOZ1321DI–03L (TR = 100µs with Output Discharge)
TD(ON) Output Turn-On Delay
VIN = 3.6V, ID = –100mA, VEN = 1.5V
120 220 µs
TROutput Rise Time 50 100 200 µs
TD(OFF) Output Turn-Off Delay 110 200 ns
TFOutput Fall-time 20 100 ns
AOZ1321DI–06L (TR = 100µs without Output Discharge)
TD(ON) Output Turn-On Delay
VIN = 3.6V, ID = –100mA, VEN = 1.5V
120 220 µs
TROutput Rise Time 50 100 200 µs
TD(OFF) Output Turn-Off Delay 110 200 ns
TFOutput Fall-time 20 100 ns
Rev. 1.1 August 2008 www.aosmd.com Page 4 of 15
AOZ1321DI
Typical Operating Characteristics
RDS(ON) Variance with Temperature
RDS(ON) (MΩ)
Temperature (°C)
ON Resistance vs. Input Voltage
Turn-on Delay vs. Input Voltage
(AOZ1321DI-02L/05L)
RDS(ON) (MΩ)Turn-On (µs)
Input Voltage (V)
Input Voltage (V)
ON Resistance vs. Input Voltage
VDROP) (mV)
Load Current (A)
EN Threshold Votlage (V)
Input Voltage (V)
EN Threshold Voltage vs. Input Voltage
50
55
60
65
70
75
80
85
90 Vds = 3.6V, Id = 0.1A
0
50
100
150
200
250
300
350
400
450
500
Vin=1.8V
Vin=2.5V
Vin=4.5V
0.4
0.5
0.6
0.7
0.8
0.9
1
1.5
-40 -20 0 20 40 60 80 100 120 140 160 2.5 3.5 4.5 5.5
VIH, Id = -250uA
VIL, Id = -250uA
0
2
4
6
8
10
12
50
60
70
80
90
100
110
120
1.5 0 0.5 1 1.5 2 2.5 32.5 3.5 4.5 5.5
IL = 1.2A
IL = 0.9A
IL = 0.1A
0
1
2
3
4
5
6
7
8
1.5 2 2.5 3 3.5 4 4.5 5
Rise Time vs. Input Voltage
(AOZ1321DI-02L/05L)
Rise Time (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Rev. 1.1 August 2008 www.aosmd.com Page 5 of 15
AOZ1321DI
Typical Operating Characteristics (Continued)
Turn-off Delay vs. Input Voltage
(AOZ1321DI-02L/05L)
Turn-Off (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Fall Time vs. Input Voltage
(AOZ1321DI-02L/05L)
Fall Time (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
0
20
40
60
80
100
120
140
160
180
200
0
200
400
600
800
1000
1200
0
5
10
15
20
25
30
35
40
0
20
40
60
80
100
120
140
160
180
0
50
100
150
200
250
300
350
400
450
0
5
10
15
20
25
30
35
40
45
Turn-on Delay vs. Input Voltage
(AOZ1321DI-01L/04L)
Turn-On (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Rise Time vs. Input Voltage
(AOZ1321DI-01L/04L)
Rise Time (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Turn-off Delay vs. Input Voltage
(AOZ1321DI-01L/04L)
Turn-Off (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Fall Time vs. Input Voltage
(AOZ1321DI-01L/04L)
Fall Time (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Rev. 1.1 August 2008 www.aosmd.com Page 6 of 15
AOZ1321DI
Typical Operating Characteristics (Continued)
0
50
100
150
200
250
300
350
0
20
40
60
80
100
120
0
50
100
150
200
250
300
0
5
10
15
20
25
30
35
40
45
50
Turn-on Delay vs. Input Voltage
(AOZ1321DI-03L/06L)
Turn-on (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Rise Time vs. Input Voltage
(AOZ1321DI-03L/06L)
Rise Time (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Turn-off Delay vs. Input Voltage
(AOZ1321DI-03L/06L)
Fall Time (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Fall Time vs. Input Voltage
(AOZ1321DI-03L/06L)
Turn-off (µs)
Input Voltage (V)
1.5 2 2.5 3 3.5 4 4.5 5
Rev. 1.1 August 2008 www.aosmd.com Page 7 of 15
AOZ1321DI
Functional Characteristics
AOZ1321DI-02L, AOZ1321DI-05L
Turn-On Timing
Time: 4µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
500mA/div
Turn-Off Timing
Time: 40µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-On Timing
Time: 10µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
2A/div
Turn-Off Timing
Time: 400µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Rev. 1.1 August 2008 www.aosmd.com Page 8 of 15
AOZ1321DI
Functional Characteristics (Continued)
AOZ1321DI-01L, AOZ1321DI-04L
Turn-On/Turn-Off Timing
Time: 1ms/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-Off Timing
Time: 40µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-On/Turn-Off Timing
Time: 1ms/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-Off Timing
Time: 400µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Rev. 1.1 August 2008 www.aosmd.com Page 9 of 15
AOZ1321DI
Functional Characteristics (Continued)
AOZ1321DI-03L, AOZ1321DI-06L
Turn-On/Turn-Off Timing
Time: 1ms/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-Off Timing
Time: 40µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-On/Turn-Off Timing
Time: 1ms/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
Turn-Off Timing
Time: 400µs/div
ENABLE
2V/div
VOUT
2V/div
IOUT
100mA/div
AOZ1321DI
Rev. 1.1 August 2008 www.aosmd.com Page 10 of 15
Timing Diagram
Figure 1. AOZ1321 Timing Diagram
Functional Block Diagram
Figure 2. Functional Block Diagram
10%
90% 90%
VIL
VIH
EN
T
D(ON)
T
R
OUT
T
D(OFF)
IN OUT
EN
GND
Gate Driver &
Slew Rate
Control
AOZ1321DI
160Ω
AOZ1321DI
Rev. 1.1 August 2008 www.aosmd.com Page 11 of 15
Detailed Description
Internal Discharge Resistor
The AOZ1321DI has an internal 160Ω 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 100µs. 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 1µF or larger capacitor for input bypassing.
Place the capacitor close to the IN pins of AOZ1321DI.
Output Capacitor Selection
Use a 0.1µF 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.
AOZ1321DI
Rev. 1.1 August 2008 www.aosmd.com Page 12 of 15
Layout Guidelines
Good PCB is important for improving the thermal perfor-
mance 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
AOZ1321DI
Rev. 1.1 August 2008 www.aosmd.com Page 13 of 15
Package Dimensions, DFN 1.2 x 1.6 4L
TOP VIEW BOTTOM VIEW
SIDE VIEW
RECOMMENDED LAND PATTERN
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.
Symbols
A
A1
A3
b
E
E1
D
D1
e
L
aaa
bbb
ccc
Dimensions in millimeters
Min.
0.50
0
0.20
1.55
0.45
1.15
0.81
0.30
—
—
—
Nom.
0.55
—
0.152 REF.
0.25
1.60
0.50
1.20
0.86
0.5 BSC
0.35
0.15
0.10
0.10
Max.
0.60
0.05
0.30
1.65
0.55
1.25
0.91
0.40
—
—
—
Symbols
A
A1
A3
b
E
E1
D
D1
e
L
aaa
bbb
ccc
Dimensions in inches
Min.
0.020
0
0.008
0.061
0.018
0.045
0.032
0.012
—
—
—
Nom.
0.022
—
0.006 REF.
0.010
0.063
0.020
0.047
0.034
0.020 BSC
0.014
0.006
0.004
0.004
Max.
0.024
0.002
0.012
0.065
0.022
0.049
0.036
0.016
—
—
—
UNIT: mm
E
DD1
e
Exposed
Pad
b
E1 A3
Pin #1ID
R0.100
Seating
Plane
Pin 1 Dot
0.30
0.65
1.30
0.86
0.55
0.275
0.40
0.50
A1
A
Rev. 1.1 August 2008 www.aosmd.com Page 14 of 15
AOZ1321DI
Tape and Reel Dimensions, DFN 1.2 x 1.6 4L
Carrier Tape
Reel
A–A' Section
B–B' Section
Section: A–A' Section: B–B'
Arbor Hole Detail A
Scale 2:1 Front View
Leader / Trailer & Orientation
Tape Size
8mm
Reel Size
ø149
M
ø179.0
±0.50
Package
DFN 1.2x1.6
T
0.254
±0.02
B0
1.78
±0.05
A0
1.38
±0.05
K0
0.78
±0.05
D0
ø1.5
±0.10
D1
ø0.6
±0.05
E
8.00
+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
N
ø55.0
±0.5
Trailer Tape
300mm Min.
Components Tape
Orientation in Pocket
Leader Tape
500mm Min.
K0
P1 P2 D0 D1 E1
E2
E3
5°
A0
E
B0
T
65°45°
E
M
W1
S
K
H
N
P0
5°
UNIT: mm
UNIT: mm
Feeding Direction
W
8.4
+1.5/-0.0
H
ø13.0
+0.5/-0.2
W1
14.4
Max.
S
1.5
Min.
K
10.1
Min.
E
2.70
±0.2
AOZ1321DI
Rev. 1.1 August 2008 www.aosmd.com Page 15 of 15
Package Marking
DFN 1.2 x 1.6
$P $W $L
Part Number Code
Underline Denotes Green Product
Lot Numbe
r
Week
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.
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.
