RT9701 Datasheet PDF - Richtek

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RT9701
Richtek

Part Number RT9701
Description Power Distribution Switches
Page 10 Pages


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RT9701
100mΩ 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 MOSFET that is free of parasitic
body diode to eliminate any reversed current flow across
the switch when it is powered off. Its low quiescent current
(23uA) and small package (SOT-23-5) 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.
Ordering Information
RT9701
Package Type
B : SOT-23-5
BL : SOT-23-5 (L-Type)
Note :
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z 100mΩ Typ. High-Side NMOSFET (SOT-23-5)
z Guaranteed 1.1A Continuous Current
z 1.5A Current Limit
z Small SOT-23-5 Package Minimizes Board Space
z Soft Start
z Thermal Protection
z Low 23uA Supply Current
z Wide Input Voltage Range : 2.2V to 6V
z UL Approved - #E219878
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Battery-Powered Equipment
z Motherboard USB Power Switch
z USB Device Power Switch
z Hot-Plug Power Supplies
z Battery-Charger Circuits
Pin Configurations
(TOP VIEW)
VOUT
5
EN
4
23
VOUT GND VIN
SOT-23-5
VOUT
5
VIN
4
23
VOUT GND VIN
SOT-23-5 (L-Type)
Typical Application Circuit
VIN
CIN
1uF
RT9701xBL
VIN VOUT
VIN VOUT
GND
VOUT
* COUT
470uF
* 470uF, Low ESR Electrolytic
DS9701-16 April 2011
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RT9701
Test Circuits
VIN
CIN +
1uF
RT9701xBL
VIN VOUT
VIN VOUT
GND
IOUT
VOUT
CL RL IL
VIN VIN-SW
Switch Off
CIN +
1uF
RT9701xBL
VIN VOUT
VIN VOUT
GND
VOUT
CL RL
Test Circuit 1
VIN
+
CIN
1uF
RT9701xB
VIN VOUT
EN VOUT
GND
Test Circuit 2
IOUT
VOUT
CL RL IL
Chip Enable
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.
Functional Pin Description
Pin Name Pin Function
VIN Power Input Voltage
V OU T
Output Voltage
GND
Ground
EN Chip Enable (Active High)
Function Block Diagram
EN
Bias
Charge
Pump
Oscillator
Control
Thermal
Detection
Current
Limit
RS
NMOSFET
VIN
(VIN)
(VOUT)
VOUT
GND
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DS9701-16 April 2011



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RT9701
Absolute Maximum Ratings
z Supply Voltage --------------------------------------------------------------------------------------------------------- 7V
z Chip Enable ------------------------------------------------------------------------------------------------------------- 0.3V to 7V
z Power Dissipation, PD @ TA = 25°C
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.25W
z Package Thermal Resistance
SOT-23-5, θJA ----------------------------------------------------------------------------------------------------------- 250°C /W
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
z Operating Junction Temperature Range -------------------------------------------------------------------------- 20°C to 100°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- 65°C to 150°C
z VOUT ESD Level
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 8kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 800V
Electrical Characteristics
(VIN = 5V, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified)
P ara meter
Symbol
Test Conditions
Min Typ Max Units
Input Voltage Range
VIN
2.2 -- 6 V
Output NMOSFET RDS(ON)
Quiescent Current
RT97 01x BL
RT9701xB R DS(ON)
IL = 1A
IL = 1A
VIN = 3V
VIN = 5V
-- 85 100
mΩ
-- 87 100
-- 19 40
μA
-- 23 45
Output Turn-On Rising Time
TR
RL = 10Ω, 90% Settling
-- 400 --
μs
Current Limit Threshold
Short-circuit Fold Back Current
ILIMIT
IOS
RL = 2Ω
VOUT = 0V, measured prior
to thermal shutdown
1.1
--
1. 5
1. 0
2
--
A
A
EN Input High Threshold RT9701xB
EN Input Low Threshold RT9701xB
Shutdown Supply Current RT9701xB
Output Leakage Current RT9701xB
VIN Under Voltage Lockout
VIN Under Voltage Hysteresis
Thermal Limit
Thermal Limit Hysteresis
I OFF
EN = “0”
ILEAKAGE EN = “0”, VOUT = 0V
U VLO
TS D
ΔTSD
2.0 -- -- V
-- -- 0.8 V
-- 0.1 1 μA
-- 0.5 10 μA
1.3 1.8
--
V
-- 100 -- mV
-- 130 --
-- 20 --
°C
°C
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RT9701
Typical Operating Characteristics
Quiescent Current vs. Temperature
40
VIN = 5V
35
30
25
20
15
10
5
0
-40 -20
0 20 40 60 80 100 120
Temperature (°C)
On-Resistance vs. Temperature
200
VIN = 5V
150 RT9701xBL
100
RT9701xB
50
0
-40 -20
0 20 40 60 80 100 120
Temperature ((°C))
Current Limit vs. Temperature
2.20
2.00
VIN = 5V
1.80
1.60
1.40
1.20
1.00
0.80
0.60
-40 -20
0 20 40 60 80 100 120
Temperature (°C)
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Quiescent Current vs. Input Voltage
40
TA = 25°C
35
30
25
20
15
10
5
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
On-Resistance vs. Input Voltage
100
TA = 25°C
95
90
RT9701xB
85
RT9701xBL
80
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage(V)
Current Limit vs. Input Voltage
1.80
TA = 25°C
1.58
1.35
1.13
0.90
0.68
0.45
0.23
0.00
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
DS9701-16 April 2011



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