High-side Power Distribution Switch with Enable AP2821
Advance Datasheet
General Description
The AP2821 is an integrated high-side power switch
that consists of TTL compatible enables input, a
charge pump, and N-Channel MOSFET. The switch’s
low RDS (ON), 120mΩ, meets USB voltage drop
requirements. It includes soft-start to limit inrush
current, over-current protection with fold-back, and
thermal shutdown to avoid switch failure during hot
plug-in. Under voltage lockout (UVLO) function is
used to ensure the device remain off unless there is a
valid input voltage present. And no reverse current
when power off, with shutdown pull-low resistor to
discharge the output capacitor when EN is disable.
The AP2821 is available in standard package of
SOT-23-5.
Features
•
Low MOSFET on Resistance: 120mΩ
=5.0V
@V
IN
Compliant to USB Specifications
•
• Operating Voltage Range: 2.7V to 5.5V
• Low Supply Current: 35μA (Typ.)
• Low Shutdown Current: <1μA
• Current Limit with Fold-back: 2A
• Under-voltage Lockout
• Soft Start-up
• Over-current Protection
• Over Temperature Protection
• Load Short Protection with Fold-back
• No Reverse Current when Power off
• Pass System ESD: IEC61000-4-2
± 16KV (Air Discharge) and ± 8KV (Contact
Discharge) on USB Connector
Applications
• USB Power Management
USB Bus/Self Powered Hubs
•
• Hot-plug Power Supplies
• Battery-charger Circuits
• Notebooks, Motherboard PCs
Figure 1. Package Type of AP2821
SOT-23-5
Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Pin Configuration
K Package
（SOT-23-5）
Figure 2. Pin Configuration of AP2821 (Top View)
Pin Descriptions
Pin No. Name Descriptions
1 VOUT Switch Output Voltage
2 GND Ground
3 EN Chip Enable Control Input, Active High
4, 5 VIN Supply Input Pin
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Functional Block Diagram
VIN
EN
3
4, 5
GND
2
Clock
Band Gap
Reference
UVLO
Gate Control
Over Current
Limiting
Thermal
Sense
Figure 3. Functional Block Diagram of AP2821
CMP
Current
Sense
Shutdown
Signal
1
VOUT
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Ordering Information
AP2821 -
Circuit Type
Package
K: SOT-23-5
Package
SOT-23-5
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and Green.
Temperature
Range
-40 to 85°C
Part Number Marking ID Packing Type
AP2821KTR-G1 G4E Tape & Reel
G1: Green
TR: T ape & Reel
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Power Supply Voltage VIN 6.0 V
Operating Junction Temperature
Range
Storage Temperature Range T
Lead Temperature (Soldering,10
Seconds)
Thermal Resistance
(Junction to Ambient)
ESD (Machine Model)
150 ºC
T
J
-65 to 150 ºC
STG
260 ºC
T
LEAD
θ
JA
235 ºC/W
200 V
ESD (Human Body Model) 2000 V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Supply Voltage VIN 2.7 5.5 V
Ambient Operation Temperature
Range
-40 85 °C
T
A
Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited
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t
f
Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Electrical Characteristics
(VIN=5.0V, CIN=4.7μF, C
Parameter Symbol Test Conditions Min Typ Max Unit
=4.7μF , Typical TA=25°C, unless otherwise specified)
OUT
Input Voltage Range VIN
Switch On Resistance R
Current Limit I
Supply Current I
Fold-back Short Current I
Shutdown Supply Current I
Output Leakage Current I
Enable High Voltage V
Enable Low Voltage V
DS(ON)
LIMIT
SUPPLY
SHORT
SHUTDOWN
LEAKAGE
ENH
ENL
VIN=5V, I
V
OUT
VIN=5V, R
V
OUT
=0.5A 120 140 mΩ
OUT
=4.0V 1.5 2.0 2.8 A
Open 35 65 μA
LOAD
=0V 1.5 A
VEN=0V, Shutdown Mode 0.1 1 μA
VEN=0V, V
=0V 0.1 1 μA
OUT
Enable Logic High 2.0 6.0 V
Enable Logic Low 0 1.2 V
2.7 5.5 V
Enable Pin Input Current IEN Force 0V to 5.0V at EN Pin 0 1.0 μA
Under Voltage Lockou
Threshold Voltage
Under Voltage Hysteresis V
Reverse Current I
V
VIN Increasing from 0V 2.2 2.5 2.7 V
UVLO
0.2 V
UVLOHY
VEN=0V, V
REVERSE
OUT>VIN
0.1 1.0 μA
Shutdown Pull Low Resistance R
DISCHARGE
Output Turn-on Time tON
Thermal Shutdown
Temperature
T
Thermal Shutdown Hysteresis T
Thermal Resistance
(Junction to Case)
VEN is disable 100 250
OTSD
HYOTSD
θ
JC
From Enable Active to 90% o
Output, R
=10Ω
L
1.9 ms
145
20
70 ºC/W
Ω
o
C
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics
80
75
70
65
60
55
50
45
40
35
30
25
Supply Current (μA)
20
15
10
5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
VEN=V
TA=-40oC
TA=25oC
TA=85oC
IN
3.0
2.8
2.6
2.4
2.2
Current Limit (A)
2.0
1.8
1.6
-40 -20 0 20 40 60 80
Temperature (oC)
VIN=5V
Figure 4. Supply Current vs. Input Voltage Figure 5. Current Limit vs. Temperature
2.4
2.1
1.8
1.5
1.2
0.9
0.6
Enable Input Threshold (V)
0.3
0.0
-40-200 20406080
VEN Rising
VEN Falling
Temperature (oC)
VIN=5V
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
Enable Input Threshold (V)
0.4
0.2
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
TA=25oC
VEN Rising
VEN Falling
Figure 6. Enable Input Threshold vs. Temperature Figure 7. Enable Input Threshold vs. Input Voltage
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics (Continued)
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
UVLO Threshold (V)
1.4
1.2
1.0
-40-200 20406080
Temperature (oC)
VIN Rising
VIN Falling
5
4
3
2
1
Output Voltage (V)
0
012345
UVLO
Input Voltage (V)
No Load
VIN Rising
VIN Falling
Figure 8. UVLO Threshold Voltage vs. Temperature Figure 9. UVLO Function
400
350
300
250
200
150
100
Switch-on Resistance (mΩ)
50
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
TA=-40oC
TA=25oC
TA=85oC
Input Voltage (V)
I
=1A
OUT
300
280
260
240
220
200
180
160
140
120
Switch-on Resistance (mΩ)
100
80
60
-40-200 20406080
I
=1A
OUT
Temperature (oC)
VIN=3V
VIN=4V
VIN=5V
Figure 10. Switch-on Resistance vs. Input Voltage Figure 11. Switch-on Resistance vs. Temperature
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v
v
v
Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics (Continued)
2.0
1.8
TA=25OC
1.6
1.4
1.2
Output Short to GND Current (A)
1.0
3.03.54.04.55.05.5
Input Voltage (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
Output Short to GND Current (A)
0.6
-40-200 20406080
Temperature (OC)
VIN=5V
V
Figure 12. Output Short to GND Current Figure 13. Output Short to GND Current
vs. Input Voltage vs. Temperature
5
4
3
V
5V/di
EN
2
Output Voltage (V)
1
0
0.0 0.5 1.0 1.5 2.0 2.5
Output Current (A)
VIN=5V
V
EN
=25OC
T
A
=5V
V
1V/di
OUT
Time 1ms/di
Figure 14. Output Voltage vs. Output Current Figure 15. Switch Turn-on and Rise Time
(VIN=3.3V, C
=4.7μF, No Load)
OUT
=5V
EN
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v
v
v
/
v
v
v
v
v
Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics (Continued)
V
5V/div
EN
V
5V/di
EN
V
1V/div
OUT
Time 1ms/di
Figure 16. Switch Turn-on and Rise Time Figure 17. Switch Turn-on and Rise Time
(V
=5.0V, C
IN
=4.7μF, No Load) (VIN=3.3V, C
OUT
V
OUT
1V/di
I
OUT
500mA
div
Time 1ms/di
=4.7μF, R
OUT
=10Ω)
L
V
EN
5V/div
V
OUT
1V/div
I
OUT
500mA
/div
Time 1ms/di
Figure 18. Switch Turn-on and Rise Time Figure 19. Switch Turn-on and Rise Time
(VIN=5.0V, C
=4.7μF, RL=10Ω) (VIN=3.3V, C
OUT
V
EN
5V/di
V
OUT
1V/di
I
OUT
500mA
/div
Time 1ms/di
=100μF, RL=10Ω)
OUT
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v
v
v
v
v
v
v
v
Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics (Continued)
V
EN
5V/div
V
5V/di
EN
(V
(V
IN
=5.0V, C
IN
=5.0V, C
V
OUT
1V/di
Time 1ms/di
OUT
Time 1ms/di
=4.7μF, No Load) (VIN=3.3V, C
OUT
=100μF, RL=10Ω) (VIN=3.3V, C
V
EN
5V/di
V
OUT
1V/di
Time 1ms/di
OUT
Time 10ms/di
OUT
=4.7μF, No Load)
=100μF, No Load)
V
OUT
1V/div
I
OUT
500mA
/div
V
EN
5V/div
V
OUT
1V/div
Figure 20. Switch Turn-on and Rise Time Figure 21. Switch Turn-off and Fall Time
Figure 22. Switch Turn-off and Fall Time Figure 23. Switch Turn-off and Fall Time
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v
v
v
v
v
v
v
v
Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics (Continued)
5V/div
V
1V/div
V
OUT
EN
V
EN
5V/di
V
OUT
1V/di
I
OUT
500mA
/div
Time 10ms/di
Time 500µs/di
Figure 24. Switch Turn-off and Fall Time Figure 25. Switch Turn-off and Fall Time
(V
IN
=5.0V, C
=100μF, No Load) (VIN=3.3V, C
OUT
=100μF, RL=10Ω)
OUT
V
5V/div
EN
V
OUT
2V/di
V
OUT
1V/div
I
OUT
500mA
/div
I
1A/di
OUT
Time 500µs/di
Time 100μs/di
Figure 26. Switch Turn-off and Fall Time Figure 27. Resistance Load Inrush Response
(VIN=5.0V, C
=100μF, RL=10Ω) (C
OUT
=4.7μF, R
OUT
=1.65Ω)
L
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v
v
v
v
Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Performance Characteristics (Continued)
V
V
EN
5V/div
I
OUT
1A/div
5V/di
V
OUT
2V/di
I
OUT
1A/di
EN
Time 200μs/di
Time 100ms/div
Figure 28. Short-circuit Current, Figure 29. Thermal Shutdown Response
Device Enable into Short (V
(V
=5.0V, C
IN
=4.7μF)
OUT
=5.0V, C
IN
=4.7μF, RL=1.65Ω)
OUT
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Typical Application
Note 2: 4.7μF input capacitor is enough in most application cases.
If the PCB trace of power rail to V
is long, larger input capacitor is necessary.
IN
Figure 30. AP2821 Typical Application
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Mechanical Dimensions
SOT-23-5 Unit: mm(inch)
2.820(0.111)
3.100(0.122)
)
)
2
4
1
2
0
0
.
.
0
)
)
9
)
)
4
8
0
1
1
1
.
.
0
0
(
(
0
0
5
0
6
0
.
.
2
3
5
0
.
0
(
0
0
5
.
1
7
6
0
.
0
(
0
0
0.200(0.008)
7
.
1
0
(
(
0
0
0
0
6
3
.
.
0
0
0.100(0.004)
0.200(0.008)
0
0
7
.
0.950(0.037)
P
Y
T
)
7
5
0
.
X
0
A
(
0
M
5
4
.
1
1.800(0.071)
2.000(0.079)
0.300(0.012)
0.500(0.020)
0
0
9
.
0
0
0
0
3
.
1
0
0
R
0
(
0
0
0
.
0
(
0
5
1
.
3
0
.
0
(
)
5
)
1
5
0
.
0
(
)
8
2
0
.
0
(
F
E
0°
8°
)
0
0
0
.
0
.
)
6
0
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Advance Datasheet
High-side Power Distribution Switch with Enable AP2821
Mounting Pad Layout
SOT-23-5
E2
G
Z
E1
Y
X
Dimensions
Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 1.900/0.075
Z
(mm)/(inch) G (mm)/(inch)X (mm)/(inch)Y (mm)/(inch)
E1
(mm)/(inch)
E2
(mm)/(inch)
Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited
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