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ISL8088

Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Intersil 

ISL8088

Typical Operating Performance (Unless otherwise noted) operating conditions are:

TA = +25°C, VIN = 2.75V to 5.5V, EN = VIN, L1 = L2 = 2.2µH, C1 = 10µF, C2 = C4 = 10µF, VOUT1 = 2.5V, VOUT2 = 1.8V,

IOUT1 = IOUT2 = 0A to 800mA. (Continued)

200ns/DIV

LX1 2V/DIV

200ns/DIV

LX1 2V/DIV

SYNCH 2V/DIV

IL1 0.5A/DIV

VOUT1 RIPPLE 20mV/DIV

FIGURE 31. CH1 STEADY STATE OPERATION AT NO

LOAD (PFM) WITH FREQUENCY = 4MHz

SYNCH 2V/DIV

IL1 0.5A/DIV VOUT1 RIPPLE 20mV/DIV

FIGURE 32. CH1 STEADY STATE OPERATION AT FULL

LOAD (PFM) WITH FREQUENCY = 4MHz

200ns/DIV

LX2 2V/DIV

200ns/DIV

LX2 2V/DIV

SYNCH 2V/DIV

VOUT2 RIPPLE 20mV/DIV

IL2 0.5A/DIV

FIGURE 33. CH2 STEADY STATE OPERATION AT NO

LOAD (PFM) WITH FREQUENCY = 4MHz

SYNCH 2V/DIV

IL2 0.5A/DIV

VOUT2 RIPPLE 20mV/DIV

FIGURE 34. CH2 STEADY STATE OPERATION AT FULL

LOAD (PFM) WITH FREQUENCY = 4MHz

100ns/DIV

LX1 5V/DIV

100ns/DIV

LX1 5V/DIV

LX2 5V/DIV

LX2 5V/DIV

SYNCH 5V/DIV

VOUT1 RIPPLE 20mV/DIV

VOUT2 RIPPLE 20mV/DIV

FIGURE 35. CH1 AND CH2 STEADY STATE OPERATION

AT NO LOAD (PFM) WITH

FREQUENCY = 4MHz

SYNCH 5V/DIV

VOUT1 RIPPLE 20mV/DIV

VOUT2 RIPPLE 20mV/DIV

FIGURE 36. CH1 AND CH2 STEADY STATE OPERATION

AT FULL LOAD (PFM) WITH

FREQUENCY = 4MHz

11

FN6858.1

April 29, 2010

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