Richtek RT9724GB, RT9724GQW Schematic [ru]

RT9724

100m

ΩΩ

Ω, 2A Slew Rate Controlled Load Switch

ΩΩ

General Description

The RT9724 is a cost-effective, low-voltage, single

N-MOSFET high-side Power Switch IC. Low switch-on

resistance (typ. 100mΩ) and low supply current (typ. 50uA)

are realized in this IC. The RT9724 integrates an over-

current protection circuit, a short fold back circuit, a

thermal shutdown circuit and an under-voltage lockout

circuit for overall protection. Besides, a slew rate

controlled function is embedded for turn-on rising time

control. The RT9724 is available in SOT-23-5 and WDFN-

8L 2x2 package.

Ordering Information

RT9724

Package Type B : SOT-23-5

QW : WDFN-8L 2x2 (W-Type)

Lead Plating System 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

z Operating Range : 2.7V to 5.5V

z Reverse Blocking Current

z Under Voltage Lockout

z Thermal Protection with Foldback

z Over Current Protection

z Short Circuit Protection

z Slew Rate Limited Turn-On Time 3ms (5V)

z RoHS Compliant and Halogen Free

ΩΩ

100m

Ω (typ.) N-MOSFET Switch

ΩΩ

Applications

z Cellular Phones

z Digital still Camera

z Hot swap Supplies

z Notebook Computers

z Personal Communication Devices

z Personal Digital Assistants

Pin Configurations

(TOP VIEW)

VIN

Marking Information

RT9724GB

1Y= : Product Code

1Y=DNN

DNN : Date Code

RT9724GQW

GV : Product Code

GVW

W : Date Code

DS9724-02 July 2012 www.richtek.com

EN GND VOUT

SOT-23-5

VOUT

GND

WDFN-8L 2x2

GND

VIN

VINEN

VIN

RT9724

Typical Application Circuit

2.7V to 5.5V

Chip Enable

1µF

VOUTVIN

RT9724

GND

Functional Pin Description

Pin No.

SOT-23-5 WDFN-8L 2x2

1 3 EN Chip Enable (Active High).

9 (Exposed Pad)

3 2 VOUT Power-Switch Output.

4, 5 5, 6, 7, 8 VIN Power Input Voltage.

-- 1 NC No Internal Connection.

Pi n Na me Pi n Functi o n

GND

Ground. The exposed pad must be soldered to a large PCB and

connected to GND for maximum power dissipation.

Function Block Diagram

OUT

0.1µF

Load

Bias

Oscillator

UVLO

Charge

Pump

Thermal

Protection

Gate

Control

Current Limiting

Output Voltage

Detection

Auto Discharge

VIN

VOUT

GND

DS9724-02 July 2012www.richtek.com

RT9724

Absolute Maximum Ratings (Note 1)

z Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 6V

z Enable Input Voltage, EN ------------------------------------------------------------------------------------------------ −0.3V to 6V

z Power Dissipation, P

SOT-23-5 -------------------------------------------------------------------------------------------------------------------- 0.458W

WDFN-8L 2x2 -------------------------------------------------------------------------------------------------------------- 0.833W

z Package Thermal Resistance (Note 2)

SOT-23-5, θJA-------------------------------------------------------------------------------------------------------------- 218.1°C/W

WDFN-8L 2x2, θJA-------------------------------------------------------------------------------------------------------- 120°C/W

z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C

z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C

z ESD Susceptibility (Note 3)

HBM (Human Body Model)---------------------------------------------------------------------------------------------- 4kV

Recommended Operating Conditions (Note 4)

z Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 2.7V to 5.5V

z Enable Input Voltage, EN ------------------------------------------------------------------------------------------------ 0V to 5.5V

z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 100°C

z Ambient Temperature Range --------------------------------------------------------------------------------------------

@ T

= 25°C

−40°C to 85°C

Electrical Characteristics

(VIN = 5V, CIN = 1μF, C

Parameter Symbol Test Conditions Min Typ Max Unit

Operation Voltage VIN 2.7 -- 5 V

Under Voltage Lookout V

Under Voltage Lockout Hysteresis

Quiescent Current IQ EN = High -- 50 70 μA

Off Supply Current I

Off Switch Current I

On-Resistance R

Curr ent Limiting I

Short Circuit Current I

Thermal shutdown Threshold TSD

Hysteresis -- 20 -- °C

EN Threshold Voltage

Enable Input Leakage IEN V

= 0.1μF, T

OUT

Logic-Low VIL V

Logic-High V

= 25°C, unless otherwise specified)

VIN Falling 1.3 1.7 2.1 V

UVLO

ΔV

SHDN

LEAKA GE

LIM

SC_FB

-- 50 -- mV

UVLO

EN = Low, V

VIN = 3.3V, I

DS(ON)

= 3.3V, V

= 0V, Measured Prior to

OUT

Thermal Shutdown V

> 1V -- 130 -- °C

OUT

= 0V -- 100 -- °C

OUT

= 2.7V to 5.5V -- -- 0.8 V

= 2.7V to 5.5V 2 -- -- V

= 5.5V -- -- 1 μA

= Open -- -- 1 μA

OUT

= 0 -- -- 1 μA

OUT

= 1.3 A -- 100 120 mΩ

OUT

= 2.3V 1.5 2 2.5 A

OUT

0.4 0.8 1.5 A

DS9724-02 July 2012 www.richtek.com

RT9724

Parameter Symbol Test Conditions Min Typ Max Unit

Output Turn-On Delay Time T

Output Turn-On Rise Time TON V

Output Turn-Off Delay Time T Output Pull-Down Resistance

During OFF

Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in

the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may

affect device reliability.

Note 2. θ Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions.

is measured at T

= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.

VIN = 5V, R

D_ON

VIN = 5V, R

D_OFF

DI SCHA RGE

= 10Ω -- 60 100 μs

LOAD

= 5V, R

= 10Ω 1 3 -- ms

LOAD

= 10Ω -- 4 10 μs

LOAD

EN = Low -- 150 -- Ω

DS9724-02 July 2012www.richtek.com

Typical Operating Characteristics

)

RT9724

On Resistance vs. Input Voltage

115

EN = 5V, I

114

113

112

On Resistance (mΩ)

111

110

2.7 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5

OUT

= 1.5A

Input Voltage (V)

Quiescent Current vs. Input Voltage

VEN = 5V, No Load

On Resistance vs. Temperature

150

VIN = VEN = 5V, I

140

130

120

110

100

On Resistance (mΩ)

-40 -20 0 20 40 60 80 100

OUT

= 1.5A

Temperature (°C)

Quiescent Current vs. Temperature

VIN = VEN = 5.5V, No Load

Quiescent Current (µA

2.7 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5

Input Voltage (V)

Shutdown Current vs. Input Voltage

0.30

VEN = 0V,No Load

0.25

0.20

0.15

0.10

Shutdown Current (µA) 1

0.05

0.00

2.7 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5

Input Voltage (V)

Quiescent Current (µA

-40 -20 0 20 40 60 80 100

Temperature (°C)

Shutdown Current vs. Tem perature

VIN = 5.5V, VEN = 0V, No Load

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

Shutdown Current (µA) 1

0.1

-40-200 20406080100

Temperature (°C)

DS9724-02 July 2012 www.richtek.com

+ 9 hidden pages