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RT9728AHGE

P1-P3P4-P6P7-P9P10-P12P13-P13
RT9728A
7
DS9728A-06 November 2013 www.richtek.com
©
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Current Limit
Time (2.5ms/Div)
Short Circuit to Full Load (5Ω)
V
OUT
(2V/Div)
Fault
(5V/Div)
I
IN
(1A/Div)
V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ
V
OUT
(2V/Div)
Fault
(5V/Div)
I
IN
(1A/Div)
Current Limit
Time (2.5ms/Div)
V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ
Full Load (5Ω) to Short Circuit
Power On from EN
Time (500μs/Div)
V
OUT
(5V/Div)
V
EN
(10V/Div)
I
IN
(1A/Div)
RT9728AH, V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ, R
OUT
= 5Ω
Power Off from EN
Time (500μs/Div)
V
OUT
(5V/Div)
V
EN
(10V/Div)
I
IN
(1A/Div)
RT9728AH, V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ, R
OUT
= 5Ω
Power Off from EN
Time (500μs/Div)
V
OUT
(5V/Div)
V
EN
(10V/Div)
I
IN
(1A/Div)
RT9728AL, V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ, R
OUT
= 5Ω
Power On from EN
Time (500μs/Div)
V
OUT
(5V/Div)
V
EN
(10V/Div)
I
IN
(1A/Div)
RT9728AL, V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ, R
OUT
= 5Ω
RT9728A
8
DS9728A-06 November 2013www.richtek.com
©
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Static Drain-Source Current vs. V
IN
- V
OUT
0
20
40
60
80
100
120
140
160
0 200 400 600 800 1000
V
IN
- V
OUT
(mV)
Static Drain-Source Current (mA) 1
V
IN
= 5.5V, R
ILIM
= 200kΩ
Static Drain-Source Current vs. V
IN
- V
OUT
0
200
400
600
800
1000
1200
1400
1600
0 200 400 600 800 1000
V
IN
- V
OUT
(mV)
Static Drain-Source Current (mA)1
V
IN
= 5.5V, R
ILIM
= 20kΩ
Current Limit
Time (2.5ms/Div)
No Load to Short Circuit
V
OUT
(2V/Div)
Fault
(5V/Div)
I
IN
(1A/Div)
V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ
Current Limit
Short Circuit to No Load
V
OUT
(2V/Div)
Fault
(5V/Div)
I
IN
(1A/Div)
V
IN
= 5V, C
OUT
= 150μF,
R
ILIM
= 20kΩ
Time (2.5ms/Div)
RT9728A
9
DS9728A-06 November 2013 www.richtek.com
©
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Applications Information
The RT9728A is a single P-MOSFET high side power
switch with active-high/low enable input, optimized for self-
powered and bus-powered Universal Serial Bus (USB)
applications. The switch's low R
DS(ON)
meets USB voltage
drop requirements and a flag output is available to indicate
fault conditions to the local USB controller.
Current Limiting and Short Circuit Protection
When a heavy load or short circuit situation occurs while
the switch is enabled, large transient current may flow
through the device. The RT9728A includes a current-limit
circuitry to prevent these large currents from damaging
the MOSFET switch and the hub downstream ports. The
RT9728A provides an adjustable current limit threshold
between 120mA and 1.3A (typ) via an external resistor,
R
ILIM
, between 19.1kΩ and 232kΩ. However, if the ILIM
pin is connected to V
IN
, the current limit threshold will be
75mA (typ). Once the current limit threshold is exceeded,
Figure 1. Current Limit Threshold vs R
ILIM
Current Limit Threshold vs. R
ILIM
0
200
400
600
800
1000
1200
1400
1600
20 50 80 110 140 170 200 230
R
ILIM
(k )
Current Limit Threshold (mA
)
Ω
the device enters constant-current mode until either
thermal shutdown occurs or the fault is removed. The
table1 shows a recommended current limit value vs. R
ILIM
resistor.
Table 1. Recommended R
ILIM
Resistor Selections
Desired Nominal
Current Limit
(mA)
Ideal Resistor
(k)
Closet 1%
Resistor (k)
Actual Limits (Include R Tolerance)
IOS Min (mA) IOS Nom (mA) IOS Max (mA)
75 Short ILIM to VIN 50.0 75.0 100.0
120 226.1 226.0 101.3 120.0 142.1
200 134.0 133.0 173.7 201.5 233.9
300 88.5 88.7 262.1 299.4 342.3
400 65.9 66.5 351.1 396.7 448.7
500 52.5 52.3 443.9 501.6 562.4
600 43.5 43.2 535.1 604.6 674.1
700 37.2 37.4 616.0 696.0 776.0
800 32.4 32.4 708.7 800.8 892.9
900 28.7 28.7 797.8 901.5 1005.2
1000 25.8 26.1 875.4 989.1 1102.8
1100 23.4 23.2 982.1 1109.7 1237.3
1200 21.4 21.5 1057.9 1195.4 1332.9
1300 19.7 19.6 1178.0 1308.5 1439.0
P1-P3P4-P6P7-P9P10-P12P13-P13

RT9728AHGE

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Description:
USB Power Switch
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New from this manufacturer.
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