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RT9270PF

High Performance, Low Noise Boost Converter

Richtek Technology 

RT9270

Preliminary

Load

Current

(200mA/Div)

Output

Voltage

AC-Coupled

(200mV/Div)

Load-Transient Response

VIN = 3.3V, VOUT = 12V

R3 = 47kΩ

C3 = 1000pF

C4 = 22pF

Inductor

Current

(1A/Div)

fOSC = 670kHz, L = 4.7uH, COUT = 33uF+0.1uF

Time (100us/Div)

Load

Current

(500mA/Div)

Output

Voltage

AC-Coupled

(200mA/Div)

Load-Transient Response

VIN = 3.3V, VOUT = 7.2V

R3 = 22kΩ

C3 = 820pF

C4 = 56pF

Inductor

Current

(1A/Div)

fOSC = 670kHz, L = 4.7uH ,COUT = 47uF+0.1uF

Time (100us/Div)

EN

(2V/Div)

Startup Waveform Without Soft-Start

VIN= 3.3V, VOUT= 12V, IOUT= 10mA

Output

Voltage

(5V/Div)

Inductor

Current

(1A/Div)

fOSC = 670kHz, NO Soft-Start Capacitor

Time (200us/Div)

EN

(2V/Div)

Startup Waveform With Soft-Start

VIN = 3.3V, VOUT= 12V, IOUT= 10mA

Output

Voltage

(5V/Div)

Inductor

Current

(500mA/Div)

fOSC = 670kHz, CSS = 0.027uF

Time (1ms/Div)

EN

(2V/Div)

Startup Waveform With Soft-Start

VIN = 3.3V, VOUT= 12V, IOUT= 100mA

Output

Voltage

(5V/Div)

Inductor

Current

(500mA/Div)

fOSC = 670kHz, CSS = 0.027uF

Time (1ms/Div)

Switching Waveform

LX Switching

Waveform

(5V/Div)

Output

Voltage

AC-Coupled

(200mV/Div)

Inductor

Current

(1A/Div)

VIN = 3.3V, VOUT= 12V, IOUT= 200mA

fOSC = 670kHz, L = 10uH, COUT = 33uF+0.1uF

Time (400ns/Div)

www.richtek.com

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DS9270-09 March 2007

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