ISL8088 データシートの表示（PDF） - Renesas Electronics

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ISL8088

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

Renesas Electronics 

DATASHEET

ISL8088

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

Regulator

FN6858

Rev 2.00

May 26, 2011

The ISL8088 is a high efficiency, dual synchronous step-down

DC/DC regulator that can deliver up to 800mA continuous

output current per channel. The supply voltage range of 2.75V

to 5.5V allows the use of a single Li+ cell, three NiMH cells or a

regulated 5V input. The current mode control architecture

enables very low duty cycle operation at high frequency with

fast transient response and excellent loop stability. The

ISL8088 operates at 2.25MHz switching frequency allowing

the use of small, low cost inductors and capacitors. Each

channel is optimized for generating an output voltage as low

as 0.6V.

The ISL8088 has a user configurable mode of operation-forced

PWM mode and PFM/PWM mode. The forced PWM mode

operation reduces noise and RF interference while the PFM

mode operation provides high efficiency by reducing switching

losses at light loads. In PFM mode of operation, both channels

draw a total quiescent current of only 30µA hence enabling

high light load efficiency in order to maximize battery life.

The ISL8088 offers a 1ms Power-Good (PG) to monitor both

output at power-up. When shutdown, ISL8088 discharges the

outputs capacitor. Other features include internal digital soft-

start, enable for power sequence, overcurrent protection, and

thermal shutdown. The ISL8088 is offered in a 3mmx3mm 10

Ld DFN package with 1mm maximum height. The complete

converter occupies less than 1.8cm2 area.

Features

• Internal Current Mode Compensation

• 100% Maximum Duty Cycle for Lowest Dropout

• Selectable Forced PWM Mode and PFM Mode

• External Synchronization up to 4MHz

• Start-up with Pre-biased Output

• Soft-Stop Output Discharge During Disabled

• Internal Digital Soft-Start - 2ms

• Power-Good (PG) Output with 1ms Delay

Applications

• DC/DC POL Modules

• µC/µP, FPGA and DSP Power

• Plug-in DC/DC Modules for Routers and Switchers

• Test and Measurement Systems

• Li-ion Battery Power Devices

• Bar Code Readers

100

90

80

2.5VOUT-PFM

70

1.8VOUT-PFM

2.5VOUT-PWM

60

50

1.8VOUT- PWM

VIN = 5V

40

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

OUTPUT LOAD (A)

FIGURE 1. EFFICIENCY CHARACTERISTICS CURVE

FN6858 Rev 2.00

May 26, 2011

Page 1 of 18

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