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RT9173

Peak 3A Bus Termination Regulator

Richtek Technology 

RT9173/A

Typical Application Circuit

VCNTL = 3.3V

VIN = 2.5V

2N7002

EN

R1

VIN

VCNTL

RT9173/A

REFEN

VOUT

R2

CSS

GND

CIN CCNTL

RTT

COUT

RDUMMY

R1 = R2 = 100kΩ, RTT = 50Ω / 33Ω / 25Ω

COUT(MIN) = 10μF (Ceramic) + 1000μF under the worst case testing condition

RDUMMY = 1kΩ as for VOUT discharge when VIN is not present but VCNTL is present

CSS = 1μF, CIN = 470μF (Low ESR), CCNTL = 47μF

Test Circuit

2.5V

3.3V

1.25V

VIN

VCNTL

RT9173/A

REFEN

VOUT

GND

VOUT

COUT V

IL

Figure 1. Output Voltage Tolerance, ΔVLOAD

2.5V

A

3.3V

1.25V

0.2V

VIN

VCNTL

RT9173/A

REFEN

VOUT

GND

VOUT

1.25V

0V

RL

COUT V

RL and COUT

Time deleay

Figure 2. Current in Shutdown Mode, ISHDN

www.richtek.com

2

DS9173/A-18 March 2007

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