PI5PD2556ZCEX [PERICOM]
Precision Adjustable Current -Limited Power Switch;
| 型号： | PI5PD2556ZCEX |
| 厂家： | 
PERICOM SEMICONDUCTOR CORPORATION |
| 描述： | Precision Adjustable Current -Limited Power Switch |
| 文件： | 总12页 (文件大小：897K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PI5PD2556/2557
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Precision Adjustable Current -Limited Power Switch
Features
Description
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
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.
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
UL Listed – File No. E341484
CB Certified
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.
Applications
Typical Application Circuit
USB Ports/Hubs
Digital TV
IN
IN
OUT
VIN
Vout
Cout
Set-Top Boxes
VOIP Phones
R1
Cin
OUT
ILIM
100k
0.1uF
/FAULT
EN
/FAULT1 Signal
Pin Configuration
Radj
Control Input
GND
1
GND
8
7
6
5
FAULT
OUT
P ower Pa d
2
3
4
IN
IN
OUT
Figure 1 Typical Application Circuit
ILIM
/EN(EN)
TDFN 3x3-8L (Top View)
Pin Description
Pin Name
Pin No.
Type
Description
PI5PD2556 PI5PD2557
1
2, 3
4
GND
IN
-
I
Ground.
Power input voltage.
Enable input, logic low turns on power switch for PI5PD2556, logic high
turns on power switch for PI5PD2557.
/EN
EN
I
External resistor used to set current-limit threshold; recommended 20 kΩ ≤
RILIM ≤ 187 kΩ.
5
ILIM
OUT
I
6, 7
8
O
O
Power switch output for channel two
Active-low open-drain output, asserted during over-current or over-
temperature condition or reverse voltage occurs
/FAULT
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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Maximum Ratings
Note:
o
o
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.
StorageTemperature...................................................................................-65 Cto+150 C
SupplyVoltage toGroundPotential............................................................-0.5Vto+6.0V
DCInputVoltage......................................................................................-0.5VtoVDD+0.5V
VoltagerangefromINtoOUT......................................................................-0.5Vto+6.0V
ControlInputVoltage(VIN)...........................................................................-0.5Vto+6.0V
(1)
Continuoustotalpowerdissipation .......................................................................2400mW
ContinuousFAULTsinkcurrent..................................................................................25mA
PowerDissipation.............................................................................................................. 0.5W
ESD:HBMMode...........................................................................................................4000V
CDMMode..............................................................................................................500V
ESD-systemlevel(contact/air)...............................................................................8kV/15kV
Recommended operation conditions
Symbol
Parameter
Conditions
Min
2.5
0
Typ
Max
5.5
5.5
5.5
-
Unit
V
IN
Input Voltage
Input Voltage
-
-
-
-
-
-
-
-
-
-
-
V
VEN
PI5PD2556
PI5PD2557
V
V/EN
0
V
IH
High-level input voltage on EN
Low-level input voltage on EN
-
-
-
-
-
-
1.1
-
V
V
V
IL
0.66
5
IOUT
Continuous output current per channel, OUT
Continuous /FAULT sink current
Recommended resistor limit range
Operating Temperature Range
0
A
IFAULT
-
10
mA
kΩ
ºC
R
ILIM
20
-40
187
85
TA
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Precision Adjustable
Current-Limited Power Switch
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DC Electrical Characteristics
VI(IN)= 5.0V; TA=-40°C to +85°C ; unless otherwise specified.
Sym
Description
Test Conditions(1)
Min
Typ
Max
Unit
Power Switch
RDS(on)
Static drain-source on-state resistance
Rise time, output
-
-
22
35
mΩ
VI(IN) = 5.0V
1
2
1
0.5
0.4
4
3
1.0
0.6
tr
VI(IN) = 2.5V
VI(IN) = 5.0V
VI(IN) = 2.5V
0.5
0.3
0.2
CL = 1F,
RL = 100Ω
ms
tf
Fall time, output
Enable EN
VIH
VIL
ton
High-level input voltage
Low-level input voltage
Turn on time
2.5 V ≤ VI(IN) ≤ 5.5 V
2.5 V ≤ VI(IN) ≤ 5.5 V
1.1
-
-
-
-
-
-
0.6
5
V
ms
CL = 1F, RL = 100Ω
toff
Turn off time
-
-
2
Current Limit
RILIM=27.4 kΩ
RILIM=61.9kΩ
3750
1590
4040
1785
4260
1960
Current-limit threshold @ VOUT = VIN * 0.8
IOS
RILIM=100kΩ
935
1100
1260
VIN = 5 V, current ramp
(≤ 100 A/s) on OUT
RILIM=27.4kΩ
VIN = 5 V, current ramp
(≤ 100 A/s) on OUT
RILIM=100kΩ
mA
s
3800
4500
5000
Overcurrent trip threshold
IOC_TRIP
950
-
1250
3.5
1500
-
tIOS
Response time to short circuit
VIN = 5.0V
Supply Current
No load on OUT, VEN=disable
TA =25°C
ISTB
Input supply current at output disable
-
0.1
2
No load on OUT,
VEN=5.0V ,
TA=25°C
RILIM=24.9kΩ
-
-
-
95
85
120
110
1.0
A
ISS
Input supply current at output enable
Reverse Leakage Current
RILIM=100kΩ
IREV
0.01
VOUTx=5.5V, VIN=0V， TA=25°C
Under Voltage Lockout
UVLO Low-level input voltage
Hysteresis for low-level input voltage
/FAULT FLAG
VIN Rising
TA=25°C
-
-
2.35
35
2.45
-
V
mV
VOL
IOFF
Output low voltage
I/FAULT =1mA
V/FAULT =5.5V
-
-
-
-
180
1
mV
Off-state leakage
/FAULT deglitch
A
FAULT assertion or de-assertion
due to over-current condition
TD
4
9
15
ms
Thermal Shutdown
-
-
-
-
-
-
155
135
20
-
-
-
OTSD2
OTSD
Thermal shutdown threshold
Thermal shutdown threshold in current-
limit
°C
Hysteresis
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
IN
IN
OUT
V
VIN
Vout
Cout
R1
Cin
0.1uF
OUT
ILIM
100k
/FAULT
EN
/FAULT1 Signal
RLIM=24.9kohm
Control Input
GND
P ower Pa d
Figure 3 Typical Characteristics Reference Schematic
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Precision Adjustable
Current-Limited Power Switch
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Typical characteristic
VOUT
2V/div
VOUT
2V/div
VEN
5V/div
VEN
5V/div
IIN
2A/div
IIN
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
VOUT
2V/div
VEN
5V/div
VFAULT
5V/div
VFAULT
5V/div
IIN
5A/div
IIN
2AV/div
t - Time - 2 mS/div
t - Time - 4 mS/div
Figure 5 Device Enabled into Short-Circuit
Figure 6 Full-Load to Short-Circuit Transient Response
VOUT
5V/div
VFAULT
5V/div
IIN
5A/div
t - Time - 10 ms/div
Figure 7 Short-Circuit to Full-Load Recovery Response
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Precision Adjustable
Current-Limited Power Switch
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Figure 8 IIN & Junction Temperature, Output Disabled
Figure 9 IIN & Junction Temperature , Output Enabled
Figure 10 IIN & VIN Supply Voltage
Figure 11 MOSFET Ron & Junction Temperature
-40°C
25°C
125°C
RLIM = 100kohm
VIN-VOUT mV/div
Figure 12 UVLO – Under voltage Lockout – V
Figure 13 Switch Current Vs. Drain-Source Voltage Across
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Precision Adjustable
Current-Limited Power Switch
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-40°C
25°C
125°
RLIM =61.9 kohm
VIN-VOUT mV/div
Figure 14 Switch Current Vs. Drain-Source Voltage Across
Functional Block Diagram
Figure 15 Functional Block Diagram
Functional Description
Overview
The PI5PD2556/2557 is a single-channel, current-limited power-distribution switch using N-channel MOSFETs for applications
where short circuits or heavy capacitive loads will be encountered. This device allows the user to program the current-limit
threshold between 500 mA and 5.0 A (typ) via an external resistor. This device incorporates an internal charge pump and gate
drive circuitry necessary to drive the N-channel MOSFETs. The charge pump supplies power to the driver circuit for each channel
and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input
voltages as low as 2.5 V and requires little supply current. The driver controls the gate voltage of the power switch. The driver
incorporates circuitry that controls the rise and fall times of the output voltage to limit large current and voltage surges and
provides built-in soft-start functionality. The PI5PD2556/2557 limits the output current to the programmed current-limit threshold
IOS during an over-current or short-circuit event by reducing the charge pump voltage driving the N-channel MOSFET and
operating it in the linear range of operation. The result of limiting the output current to IOS reduces the output voltage at OUT
because the N-channel MOSFET is no longer fully enhanced.
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Precision Adjustable
Current-Limited Power Switch
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Over-current Conditions
When an over-current condition is detected, the device maintains a constant output current and reduces the output voltage
accordingly.
The PI5PD2556/2557 thermal cycles if an overload condition is present long enough to activate thermal limiting in any of the
above cases. The device turns off when the junction temperature exceeds 135°C (min) while in current limit. The device remains
off until the junction temperature cools 20°C (typ) and then restarts. The PI5PD2556/2557 cycles on/off until the overload is
removed.
/FAULT Response
The FAULT open-drain outputs are asserted (active low) during an over-current or over-temperature condition. The
PI5PD2556/2557 asserts the FAULTx signal until the fault condition is removed and the device resumes normal operation. The
PI5PD2556/2557 is designed to eliminate false FAULT reporting by using an internal delay "deglitch" circuit (9-ms typ) for over-
current conditions without the need for external circuitry. This ensures that FAULT is not accidentally asserted due to normal
operation such as starting into a heavy capacitive load. The deglitch circuitry delays entering and leaving current-limited induced
fault conditions. The FAULT signal is not deglitched when the MOSFET is disabled due to an over-temperature condition but is
deglitched after the device has cooled and begins to turn on. This unidrectional deglitch prevents FAULT oscillation during an
over-temperature event.
Under-voltage Lockout (UVLO)
The under-voltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn-on threshold.
Built-in hysteresis prevents unwanted on/off cycling due to input voltage droop during turn on.
Enable (EN OR /EN)
The logic enables control the power switches and device supply current. The supply current is reduced to less than 2-μA when a
logic high is present on /EN or when a logic low is present on EN. A logic low input on /EN or a logic high input on EN enables
the driver, control circuits, and power switches. The enable inputs are compatible with both TTL and CMOS logic levels.
Thermal Sense
The PI5PD2556/2557 self protects by using two independent thermal sensing circuits that monitor the operating temperature of the
power switch and disable operation if the temperature exceeds recommended operating conditions. The PI5PD2556/2557 operates
in constant-current mode during an over-current condition, which increases the voltage drop across the power switch. The power
dissipation in the package is proportional to the voltage drop across the power switch, which increases the junction temperature
during an over-current condition. The first thermal sensor (OTSD) turns off the power switch when the die temperature exceeds
135°C (min) and the chip is in current limit. Hysteresis is built into the thermal sensor, and the switch turns on after the device has
cooled approximately 20°C.
The PI5PD2556/2557 also has a second ambient thermal sensor (OTSD2). The ambient thermal sensor turns off power switch
when the die temperature exceeds 155°C (min) regardless of whether the power switch are in current limit and will turn on the
power switches after the device has cooled approximately 20°C. The PI5PD2556/2557 continues to cycle off and on until the fault
is removed.
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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Application Information
Input and Output Capacitance
Input and output capacitance improves the performance of the device; the actual capacitance should be optimized for the particular
application. For all applications, a 0.1uF or greater ceramic bypass capacitor between IN and GND is recommended as close to the
device as possible for local noise decoupling. This precaution reduces ringing on the input due to power-supply transients.
Additional input capacitance may be needed on the input to reduce voltage overshoot from exceeding the absolute-maximum
voltage of the device during heavy transient conditions or output shorting. This is especially important during bench testing when
long inductive cables are used to connect the evaluation board to the bench power supply. Normally suggested the distance
between IC and DC supply source is less than 15cm.
Output capacitance also need to be close to IC as possible. When large transient currents are expected on the output , placing a
high-value electrolytic capacitor on the output pin is recommended.
Programming the Current-Limit Threshold
The overcurrent threshold is user programmable via an external resistor. The PI5PD2556/57 uses an internal regulation loop to
provide a regulated voltage on the ILIM pin. The current-limit threshold is proportional to the current sourced out of ILIM. The
recommended 1% resistor range for RILIM is 20 kΩ ≤ RILIM ≤ 187 kΩ to ensure stability of the internal regulation loop.
Many applications require that the minimum current limit is above a certain current level or that the maximum current limit is
below a certain current level, so it is important to consider the tolerance of the overcurrent threshold when selecting a value for
RILIM. The following equations approximate the resulting overcurrent threshold for a given external resistor value ®ILIM).
Consult the Electrical Characteristics table for specific current limit settings. The traces routing the RILIM resistor to the
PI5PD2556/57 should be as short as possible to reduce parasitic effects on the current-limit accuracy.
Figure 16 Current Limit Threshold & RILIM
Application 1: Designing above a Minimum Current Limit
Some applications require that current limiting cannot occur below a certain threshold. For this example, assume
that 3 A must be delivered to the load so that the minimum desired current-limit threshold is 3000 mA. Use the
IOS equations and Figure 7 to select RILIM.
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Precision Adjustable
Current-Limited Power Switch
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Select the closest 1% resistor less than the calculated value: RILIM = 33.2 kΩ. This sets the minimum current-limit
threshold at 3000 mA . Use the IOS equations, Figure 7, and the previously calculated value for RILIM to
calculate the maximum resulting current-limit threshold.
The resulting maximum current-limit threshold is 3592 mA with a 33.2 kΩ resistor.
Application 2: Designing Below a Maximum Current Limit
Some applications require that current limiting must occur below a certain threshold. For this example, assume
that the desired upper current-limit threshold must be below 5000 mA to protect an up-stream power supply. Use
the IOS equations and Figure 7 to select RILIM.
Select the closest 1% resistor greater than the calculated value: RILIM = 23.7kΩ. This sets the maximum
current-limit threshold at 5000 mA . Use the IOS equations, Figure 7, and the previously calculated value for
RILIM to calculate the minimum resulting current-limit threshold.
The resulting minimum current-limit threshold is 4316 mA with a 23.7 kΩ resistor
Accounting For resistor Tolerance
The previous sections described the selection of RILIM given certain application requirements and the importance of
understanding the current-limit threshold tolerance. The analysis focused only on the PI5PD2556/57 performance and assumed an
exact resistor value. However, resistors sold in quantity are not exact and are bounded by an upper and lower tolerance centered
around a nominal resistance. The additional RILIM resistance tolerance directly affects the current-limit threshold accuracy at a
system level. The following table shows a process that accounts for worst-case resistor tolerance assuming 1% resistor values.
Step one follows the selection process outlined in the application examples above. Step two determines the upper and lower
resistance bounds of the selected resistor. Step three uses the upper and lower resistor bounds in the IOS equations to calculate the
threshold limits. It is important to use tighter tolerance resistors, e.g. 0.5% or 0.1%, when precision current limiting is desired.
Table 1. Common RILIM Resistor Selections
Desired Nominal
Current Limit (mA) Resistor
Ideal
Closet 1%
Resistor
(kΩ)
Resistor Tolerance
Actual Limits
Ios Min
(mA)
605
Ios Nor
(mA)
749
1002
1244
1508
1742
2012
2269
Ios Max
(mA)
886
1166
1430
1725
1965
2252
2523
1% Low (kΩ) 1% High(kΩ)
(kΩ)
750
146.9
110.2
88.2
73.6
63.1
55.2
49.1
147
110
145.5
108.9
87.8
72.5
62.8
54.4
48.2
148.5
111.1
89.6
73.9
64
1000
1250
1500
1750
2000
2250
825
88.7
73.2
63.4
54.9
48.7
1039
1276
1489
1737
1975
55.4
49.2
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PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
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2500
2750
3000
3250
3500
3750
4000
4250
4500
4750
5000
5250
5500
44.2
40.2
36.9
34
31.6
29.5
27.7
26.0
24.6
23.3
22.1
21.1
20.1
44.2
40.2
36.5
34
31.6
29.4
27.4
26.1
24.9
23.2
22.1
21
43.8
39.8
36.1
33.7
31.3
29.1
27.1
25.8
24.7
23
44.6
40.6
36.9
34.3
31.9
29.7
27.7
26.4
25.1
23.4
22.3
21.2
20.2
2191
2425
2689
2901
3138
3390
3656
3851
4050
4369
4602
4861
5121
2501
2750
3030
3253
3501
3764
4039
4241
4446
4773
5011
5274
5539
2765
3025
3315
3545
3800
4068
4349
4554
4761
5091
5331
5595
5859
21.9
20.8
19.8
20
2015-08-0011
PT0497-4
08/31/15
11
PI5PD2556/2557
Precision Adjustable
Current-Limited Power Switch
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mechanical Information
TDFN 3.0x3.0-8L
Ordering Information
Part No.
Package Code
Package
Lead free and Green 8-pin TDFN3.0x3.0
Tape & reel
PI5PD2556ZCEX
PI5PD2557ZCEX
ZC
ZC
Lead free and Green 8-pin TDFN3.0x3.0
Tape & reel
Note:
E = Pb-free and Green
Adding X Suffix= Tape/Reel
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply
the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The
company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
2015-08-0011
PT0497-4
08/31/15
12
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