RICHTEK RT9701CB, RT9701CBL Datasheet
RT9701
100mΩΩΩΩ Power Distribution Switches
General Description
The RT9701 is an integrated 100mΩ power switch
for self-powered and bus-powered Universal Series
Bus (USB) applications. A built-in charge pump is
used to drive the N-channel NMOSFET that is free
of parasitic body diode to eliminate any reversed
current flow across the switch when it is powered
off. Its low quiescent supply current (23µA) and
small package (SOT-25) is particularly suitable in
battery-powered portable equipment.
Several protection functions include soft start to limit
inrush current during plug-in, current limiting at 1.5A
to meet USB power requirement, and thermal
shutdown to protect damage under over current
conditions.
Applications
Battery-Powered Equipment
z
Motherboard USB Power Switch
z
USB Device Power Switch
z
Hot-Plug Power Supplies
z
Battery-Charger Circuits
z
Ordering Information
Features
z
100mΩΩΩΩ Typ. High-Side NMOSFET (SOT- 25)
Guaranteed 1.1A Continuous Current
z
1.5A Current Limit
z
Small SOT- 25 Package Minimizes Board Space
z
Soft Start
z
Thermal Protection
z
Low 23µµµµA Supply Current
z
Wide Input Voltage Range: 2.2V ~ 6V
z
UL Approved - #E219878
z
Pin Configurations
Part Number Pin Configurations
RT9701CBL
(Plastic SOT-25)
RT9701CB
(Plastic SOT-25)
54
321
54
321
TOP VIEW
1. VOUT
2. GND
3. VIN
4. VIN
5. VOUT
TOP VIEW
1. VOUT
2. GND
3. VIN
4. CE
5. VOUT
RT9701
Package type
Typical Application Circuit
BL : SOT-25
B : SOT-25
Operating temperature range
C: Commercial standard
IN
C
IN
1 µF
RT9 701 CBL
VINV
VIN
GND
VOUT
VOUT
*C
OUT
470 µF
V
OUT
Marking Information
Part Number Marking
RT9701CBL AH
RT9701CB C0
DS9701-05 October 2001 www.richtek-ic.com.tw
* 470µF, Lo w ESR Electro lyti c
1
RT9701
Pin Description
Pin Name Pin Function
VIN Power Input
VOUT Output Voltage
GND Ground
CE Chip Enable
Test Circuits
C
IN
V
IN
+
V
IN
Switch Off
V
OUT
RT9701 CBL
VIN
VIN
VOUT
VOUT
GND
I
OUT
+
C
L
I
R
L
L
Test Circuit 1
V
IN- SW
RT9701 CBL
VIN
VOUT
VOUTVIN
+
C
IN
GND
C
L
V
OUT
+
R
L
Test Circuit 2
V
IN
RT9701 CB
VIN
CE
V
+
C
IN
CE
VOUT
VOUT
GND
I
OUT
C
L
V
OUT
+
I
R
L
L
On
Off
Test Circuit 3
Test Circuit 2 is performed by charging an external tank of bulk capacitor to the input then applying this voltage to
the input of the unit.
All typical operating characteristics curves showed are referred to Test Circuit 1, unless specified to Test Circuit 2
or Test Circuit 3.
www.richtek-ic.com.tw DS9701-05 October 2001
2
Function Block Diagram
RT9701
CE
Bias
Charg e
Pump
Oscillator
Control
Thermal
Detection
Current
Limit
RS
NMOSFE T
VIN
(VIN)
(VOUT)
VOUT
GND
Absolute Maximum Ratings
z Supply Voltage 7V
z Chip Enable -0.3V ~ 7V
z Power Dissipation, P
SOT-25 0.25W
z Operating Junction Temperature Range -20°C ~ 100°C
z Storage Temperature Range -65°C ~ 150°C
z Package Thermal Resistance
SOT-25, θ
z V
OUT
JA
ESD Level
HBM (Human Body Mode) 8KV
MM (Machine Mode) 800V
@ TA = 25°C
D
250°C /W
DS9701-05 October 2001 www.richtek-ic.com.tw
3
RT9701
Electrical Characteristics
(V
= 5V, CIN = C
IN
= 1µF, TA = 25°C, unless otherwise specified)
OUT
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage Range
V
IN
2.2 -- 6 V
RT9701CBL IL = 1A -- 100 130
Output NMOFET R
DS(ON)
RT9701CB
R
DS(ON)
IL = 1A -- 105 135
mΩ
VIN = 3V -- 19 40
Supply Current
Output Turn-On Rising Time
Current Limit Threshold
Short-circuit Fold Back Current
T
R
I
LIMIT
I
OS
V
= 5V
IN
RL = 10Ω, 90% Settling
RL = 2Ω
V
= 0V, measured
OUT
prior to thermal shutdown
--
--
23 45
400 --
1.1 1.5 2 A
-- 1.0 -- A
µA
µS
CE Input High Threshold RT9701CB 2.0 -- -- V
CE Input Low Threshold RT9701CB -- -- 0.8 V
Shutdown Supply Current RT9701CB
Output Leakage Current RT9701CB
VIN Under Voltage Lockout
VIN Under Voltage Hysteresis
Thermal Limit
Thermal Limit Hysteresis
I
OFF
I
LEAKAGE
UVLO 1.3 1.8 -- V
T
SD
∆T
SD
CE = “0” -- 0.1 1
CE = “0”, V
= 0V -- 0.5 10
OUT
-- 100 -- mV
-- 130 --
-- 20 --
µA
µA
°C
°C
www.richtek-ic.com.tw DS9701-05 October 2001
4
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