Richtek RT9701GB, RT9701GBL, RT9701PB, RT9701PBL Schematic [ru]
RT9701
100m
ΩΩ
Ω Power Distribution Switches
ΩΩ
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-Cha
nnel 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)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
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.
Features
zz
z
zz
zz
z Guaranteed 1.1A Continuous Current
zz
zz
z 1.5A Current Limit
zz
zz
z Small SOT-23-5 Package Minimizes Board Space
zz
zz
z Soft Start
zz
zz
z Thermal Protection
zz
zz
z Low 23uA Supply Current
zz
zz
z Wide Input Voltage Range : 2.2V to 6V
zz
zz
z UL Approved - #E219878
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
zz
Ω Ω
100m
Ω T yp. High-Side NMOSFET (SOT-23-5)
Ω Ω
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
VOUT
EN
23
GND
VIN
VOUT
4
5
VOUT
VIN
23
VIN
GND
4
SOT-23-5
SOT-23-5 (L-Type)
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9701-16 April 2011 www.richtek.com
Typical Application Circuit
RT9701xBL
V
IN
C
IN
1uF
VIN
VIN
* 470uF, Low ESR Electrolytic
VOUT
VOUT
GND
* C
OUT
470uF
V
OUT
1
RT9701
Test Circuits
V
IN
VIN
C
1uF
+
IN
VIN
V
C
1uF
IN
IN-SW
+
RT9701xBL
VIN
VIN
GND
RT9701xBL
VOUT
VOUT
GND
I
OUT
V
IN
V
OUT
+
C
L
I
L
R
L
Switch Off
Test Circuit 1 Test Circuit 2
VOUT
VOUT
V
OUT
+
C
L
R
L
V
OUT
+
I
L
L
R
L
C
1uF
IN
V
IN
+
Chip Enable
RT9701xB
VIN
EN
GND
VOUT
VOUT
I
OUT
C
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
VOUT Output Voltage
GND Ground
EN Chip Enable (Active H igh)
Function Block Diagram
EN
Bias
Charge
Pump
Oscillator
2
Control
Thermal
Detection
Current
Limit
NMOSFET
RS
VIN
(VIN)
(VOUT)
VOUT
GND
DS9701-16 April 2011www.richtek.com
RT9701
Absolute Maximum Ratings
z Supply Voltage --------------------------------------------------------------------------------------------------------- 7V
z Chip Enable ------------------------------------------------------------------------------------------------------------- −0.3V to 7V
z Power Dissipation, P
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 V
ESD Level
OUT
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 8kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 800V
Electrical Characteristics
(V
= 5V, C
IN
= C
IN
OUT
Parameter Symbol Test Conditions Min Typ Max Units
@ T
= 25°C
D
A
= 1μF, TA = 25°C, unless otherwise specified)
Input Voltage Range
RT97 01xBL
Output NMOSFET R
DS(ON)
RT97 01xB
Quiescent Current
Output Turn-On Rising Time
Current Limit Threshold
Short-circuit Fo ld Back Current
EN Input High Threshold RT97 01xB
V
IN
R
DS(ON )
R
T
R
I
LIMIT
I
OS
2.2 -- 6 V
= 1A
I
L
= 1A
I
L
= 3 V
V
IN
VIN = 5 V
= 10Ω, 90% Settling
L
RL = 2Ω
= 0V, measured prior
V
OUT
to thermal shutdown
-- 85 100
mΩ
-- 87 100
-- 19 40
μA
-- 23 45
-- 400 -- μs
1.1 1.5 2 A
-- 1.0 -- A
2.0 -- -- V
EN Input Low Threshold RT97 01xB -- -- 0.8 V
Shutdown S upp ly Current RT97 01xB
Outpu t Lea kage Current RT97 01xB
VIN Under Voltage Lockout
VIN Under Voltage Hysteresis
Thermal Limit
Thermal Limit Hysteresis
I
OFF
I
LEAKAGE
UVLO 1.3 1.8 -- V
-- 100 -- mV
T
SD
ΔT
SD
EN = “0” -- 0.1 1
EN = “0”, V
OUT
= 0V
-- 0.5 10 μ A
-- 130 --
-- 20 --
μA
°C
°C
DS9701-16 April 2011 www.richtek.com
3
RT9701
Typical Operating Characteristics
Quiescent Current vs. Temperature
40
35
30
25
20
15
10
Quiescent Current ( uA)
5
0
-40 -20 0 20 40 60 80 100 120
Temperature
(°C)
On-Resistance vs. Temperature
200
150
RT9701xBL
V
V
IN
IN
= 5V
= 5V
Quiescent Current vs. Input Voltage
40
T
35
30
25
20
15
10
Quiescent Current (uA)
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. In put Volt age
100
T
95
= 25°C
A
= 25°C
A
100
50
On-Resistance (mΩ)
0
-40-20 0 20 40 60 80100120
Temperature (℃)
RT9701xB
(°C)
Current Limit vs. Temperature
2.20
2.00
1.80
1.60
1.40
1.20
Current Limit (A)
1.00
0.80
0.60
-40-20 0 20406080100120
Temperature
(°C)
V
IN
= 5V
90
RT9701xB
85
On-Resistance (mΩ)
80
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
RT9701xBL
Input Voltage(V)
Current Limit vs. Input Voltage
1.80
T
1.58
1.35
1.13
0.90
0.68
Current Limit (A)
0.45
0.23
0.00
2.02.53.03.54.04.55.05.56.0
Input Voltage (V)
A
= 25°C
DS9701-16 April 2011www.richtek.com
4
Loading...