RT9971 datasheet(15/22 Pages) RICHTEK

15 / 22 page

DS9971-01 April 2011

www.richtek.com

RT9971

CH6 Output Voltage Ripple

Time (1

μs/Div)

LX6

(10V/Div)

VOUT_CH6_ac

(10mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH6 = -8V,

IOUT = 50mA, L6 = 10

μH, C18 = 10μFx2

CH5 Output Voltage Ripple

Time (1

μs/Div)

LX5

(10V/Div)

VOUT_CH5_ac

(10mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH5 = 16V,

IOUT = 30mA, L5 = 10

μH, C16 = 10μF

CH3 Output Voltage Ripple

Time (1

μs/Div)

LX3

(2V/Div)

VOUT_CH3_ac

(10mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH3 = 2.5V,

IOUT = 300mA, L3 = 4.7

μH, C9 = 10μF

CH2 Output Voltage Ripple

Time (1

μs/Div)

LX2

(2V/Div)

VOUT_CH2_ac

(10mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH2 = 3.3V,

IOUT = 400mA, L2 = 4.7

μH, C5 = 10μF

Power Off

Time (1ms/Div)

VOUT_CH1

(5V/Div)

VOUT_CH2

(5V/Div)

VOUT_CH3

(2V/Div)

VOUT_CH4

(1V/Div)

VDDM = 5V, VBAT = 3.7V, SEL = Low

CH1 Output Voltage Ripple

Time (1

μs/Div)

LX1

(2V/Div)

VOUT_CH1_ac

(20mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH1 = 5V,

IOUT = 400mA, L1 = 2.2

μH, C1 = 10μFx2

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