RT9953 datasheet(12/19 Pages) RICHTEK

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RT9953

DS9953-02 April 2011

www.richtek.com

CH4 Step-Down Output Voltage vs. Output Current

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

100

200

300

400

500

600

Output Current (mA)

VBAT = 4.5V

VBAT = 5V

VDDM = 5V

CH3 Output Voltage Ripple

Time (500ns/Div)

LX3

(2V/Div)

VOUT_CH3_ac

(5mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH3 = 1.8V,

IOUT = 300mA, L3 = 4.7

μH, C8 = 10μF

CH4 Output Voltage Ripple

Time (500ns/Div)

LX4

(2V/Div)

VOUT_CH4_ac

(5mV/Div)

VDDM = 5V, VBAT = 4.2V, VOUT_CH4 = 3.3V,

IOUT = 300mA, L4 = 4.7

μH, C11 = 10μF

CH2 Step-Up Output Voltage Ripple

Time (500ns/Div)

LX2

(2V/Div)

VOUT_CH2_ac

(10mV/Div)

VDDM = 3V, VBAT = 1.8V, VOUT_CH2 = 3.3V,

IOUT = 300mA, L2 = 2.2

μH, C5 = 10μFx2

CH2 Step-Down Output Voltage Ripple

Time (500ns/Div)

LX2

(2V/Div)

VOUT_CH2_ac

(5mV/Div)

VDDM = 5V, VBAT = 3.7V, VOUT_CH2 = 1.2V,

IOUT = 300mA, L2 = 2.2

μH, C5 = 10μF

CH1 Output Voltage Ripple

Time (500ns/Div)

LX1

(2V/Div)

VOUT_CH1_ac

(10mV/Div)

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

IOUT = 300mA, L1 = 2.2

μH, C2 = 10μFx2

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