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PI5PD2556/2557
Precision Adjustable Current -Limited Power Switch
Features
Meets USB Current-Limiting Requirement
±
6.5% Current-Limit Accuracy at 4.0A
Adjustable Current Limit, 500mA-5A (typ.)
Fast Over-current Response - 3.5μS (typ.)
22mΩ High-Side MOSFET
Operating Range: 2.5 V to 5.5V
2-μA Maximum Standby Supply Current
Built-in Soft-Start
15 kV / 8 kV System-Level ESD Capable
Device Package: TDFN 3x3-8L
Description
The PI5PD2556/2557 series is single-channel power-
distribution switch intended for applications where
precision current limiting is required or heavy capacitive
loads and short circuits are encountered. These devices
offer a programmable current-limit threshold between
500 mA and 5A (typ) per channel via an external resistor.
The power-switch rise and fall times are controlled to
minimize current surges during turn on/off.
Each channel of the PI5PD2556/2557 devices limits the
output current to a safe level by switching into a
constant-current mode when the output load exceeds the
current-limit threshold.
UL Listed
–
File No. E341484
CB Certified
Applications
USB Ports/Hubs
Digital TV
Set-Top Boxes
VOIP Phones
Typical Application Circuit
Vout
V
IN
R1
10 0k
Cin
0. 1uF
IN
IN
O UT
Vout
Cout
O UT
IL IM
/FAULT1 Sign al
/FAU LT
Radj
Con trol In put
EN
G ND
P ow er Pa d
Pin Configuration
GND
IN
IN
1
2
3
8 FAULT
7
6
5
OUT
OUT
ILIM
/EN(EN) 4
Figure 1
Typical Application Circuit
TDFN 3x3-8L (Top View)
TDFN 2x3-8L (Top View)
Pin Description
Pin Name
Pin No.
PI5PD2556
1
2, 3
4
5
6, 7
8
/EN
ILIM
OUT
/FAULT
PI5PD2557
-
I
EN
I
I
O
O
Power input voltage.
Enable input, logic low turns on power switch for PI5PD2556, logic high
turns on power switch for PI5PD2557.
External resistor used to set current-limit threshold; recommended 20 kΩ ≤
RILIM ≤ 187 kΩ.
Power switch output for channel two
Active-low open-drain output, asserted during over-current or over-
temperature condition or reverse voltage occurs
Ground.
GND
IN
Type
Description
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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Maximum Ratings
Storage Temperature ................................................................................... -65oC to +150oC
Supply Voltage to Ground Potential ............................................................-0.5V to +6.0V
DC Input Voltage......................................................................................-0.5V to V
DD
+0.5V
Voltage range from IN to OUT ......................................................................-0.5V to+6.0V
Control Input Voltage (VIN) ...........................................................................-0.5V to+6.0V
Continuous total power dissipation
(1)
.......................................................................2400mW
Continuous FAULT sink current ..................................................................................25mA
Power Dissipation .............................................................................................................. 0.5W
ESD: HBM Mode...........................................................................................................4000V
CDM Mode.............................................................................................................. 500V
ESD-system level (contact/air)...............................................................................8kV/15kV
Note:
1. Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating only
and functional operation of the device at these or
any other conditions above those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
reliability.
2. The JEDEC high-K (2s2p) board used to derive
this data was a 3in × 3in, multilayer board with 1-
ounce internal power and ground planes and 2-
ounce copper traces on top and bottom of the board.
Recommended operation conditions
Symbol
V
IN
V
EN
Input Voltage
V/
EN
V
IH
V
IL
I
OUT
I
FAULT
R
ILIM
T
A
PI5PD2557
High-level input voltage on EN
Low-level input voltage on EN
Continuous output current per channel, OUT
Continuous /FAULT sink current
Recommended resistor limit range
Operating Temperature Range
-
-
-
-
-
-
0
1.1
-
0
-
20
-40
-
-
-
-
-
-
-
5.5
-
0.66
5
10
187
85
V
V
A
mA
kΩ
º
C
Input Voltage
PI5PD2556
Parameter
Conditions
-
-
Min
2.5
0
Typ
-
-
Max
5.5
5.5
V
Unit
V
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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DC Electrical Characteristics
V
I(IN)
= 5.0V; T
A
=-40° to +85° unless otherwise specified.
C
C;
Sym
Power Switch
R
DS(on)
t
r
t
f
Enable EN
V
IH
V
IL
t
on
t
off
High-level input voltage
Low-level input voltage
Turn on time
Turn off time
2.5 V ≤ V
I(IN)
≤ 5.5 V
2.5 V ≤ V
I(IN)
≤ 5.5 V
1.1
-
-
-
-
-
-
-
-
0.6
5
2
V
ms
Static drain-source on-state resistance
Rise time, output
Fall time, output
V
I(IN)
= 5.0V
V
I(IN)
= 2.5V
V
I(IN)
= 5.0V
V
I(IN)
= 2.5V
-
-
22
2
1
0.5
0.4
35
4
3
1.0
0.6
mΩ
Description
Test Conditions
(1)
Min
Typ
Max
Unit
C
L
= 1F,
R
L
= 100Ω
1
0.5
0.3
0.2
ms
C
L
= 1F, R
L
= 100Ω
Current Limit
I
OS
Current-limit threshold @ V
OUT
= V
IN
* 0.8
R
ILIM
=27.4 kΩ
R
ILIM
=61.9kΩ
R
ILIM
=100kΩ
V
IN
= 5 V, current ramp
(≤ 100 A/s) on OUT
3750
1590
935
3800
4040
1785
1100
4500
4260
1960
1260
5000
mA
I
OC_TRIP
Overcurrent trip threshold
R
ILIM
=27.4kΩ
V
IN
= 5 V, current ramp
(≤ 100 A/s) on OUT
950
-
1250
3.5
1500
-
s
R
ILIM
=100kΩ
t
IOS
Response time to short circuit
V
IN
= 5.0V
No load on OUT, V
EN
=disable
T
A
=25°
C
No load on OUT, R
ILIM
=24.9kΩ
V
EN
=5.0V ,
R
ILIM
=100kΩ
T
A
=25°
C
V
OUTx
=5.5V, V
IN
=0V， T
A
=25°
C
V
IN
Rising
T
A
=25°
C
I
/FAULT
=1mA
V
/FAULT
=5.5V
FAULT assertion or de-assertion
due to over-current condition
-
-
-
Supply Current
I
STB
I
SS
I
REV
UVLO
Input supply current at output disable
Input supply current at output enable
Reverse Leakage Current
Low-level input voltage
Hysteresis for low-level input voltage
/FAULT FLAG
V
OL
I
OFF
T
D
Output low voltage
Off-state leakage
/FAULT deglitch
-
-
4
-
-
9
180
1
15
mV
A
ms
-
-
-
-
-
-
0.1
95
85
0.01
2.35
35
2
120
110
1.0
2.45
-
V
mV
A
Under Voltage Lockout
Thermal Shutdown
OTSD2
OTSD
Thermal shutdown threshold
Thermal shutdown threshold in current-
limit
Hysteresis
-
-
-
155
135
20
-
-
-
°
C
Note:
Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account
separately.
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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Parameter Measurement information
Figure 2 Test Circuit and Voltage Waveforms
V
IN
Vout
IN
R1
10 0k
IN
O UT
Vout
Cout
=150uF
C
OUT
Cin
0. 1uF
O UT
IL IM
/FAULT1 Sign al
/FAU LT
Radj
LIM
=24.9kohm
R
Con trol In put
EN
G ND
P ow er Pa d
Figure 3 Typical Characteristics Reference Schematic
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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Typical characteristic
V
OUT
2V/div
V
OUT
2V/div
V
EN
5V/div
V
EN
5V/div
I
IN
2A/div
I
IN
2A/div
t - Time - 2 mS/div
t - Time - 2 mS/div
Figure 3 Turn-on Delay and Rise Time
Figure 4 Turn-off Delay and Fall Time
V
EN
5V/div
V
FAULT
5V/div
V
OUT
2V/div
V
FAULT
5V/div
I
IN
2AV/div
t - Time - 2 mS/div
I
IN
5A/div
t - Time - 4 mS/div
Figure 5 Device Enabled into Short-Circuit
Figure 6 Full-Load to Short-Circuit Transient Response
V
OUT
5V/div
V
FAULT
5V/div
I
IN
5A/div
t - Time - 10 ms/div
Figure 7 Short-Circuit to Full-Load Recovery Response
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