RT9173B Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
componentes Descripción
Fabricante
RT9173B Datasheet PDF : 13 Pages
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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
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2
DS9173B-09 March 2007
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