RT9173BPS Просмотр технического описания (PDF) - Richtek Technology

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RT9173BPS

2A Bus Termination Regulator

Richtek Technology 

RT9173B

Typical Application Circuit

VCNTL = 3.3V

CCNTL

2N7002

EN

R1 VCNTL

VIN

RT9173B

REFEN

VOUT

R2

GND

VIN = 2.5V

RTT

CIN

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

CIN = 470μF (Low ESR), CCNTL = 47μF

Test Circuit

3.3V

2.5V

1.25V

VCNTL

VIN

RT9173B

REFEN

VOUT

GND

VOUT

COUT V

IL

Figure 1. Output Voltage Tolerance, ΔVOUT

1.25V

0.2V

3.3V

A

2.5V

VCNTL

VIN

RT9173B

REFEN

VOUT

GND

1.25V

VOUT

0V

RL

COUT V

RL and COUT

Time deleay

Figure 2. Current in Shutdown Mode, ΙSHDN

www.richtek.com

2

DS9173B-09 March 2007

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