ISL9105 600mA Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator

ISL9105

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600mA Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator

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Ordering Information

iBuy direct from Intersil	iBuy direct - out of stock	Request samples
Check distributor inventory	Available in RoHS/Pb-Free

Part No.

Design-In
Status

Temp.

Package

MSL

Price
US $

ISL9105EVAL1Z

Active

Eval Board

N/A

ISL9105IRZ-T

Active

Ind

8 Ld DFN T+R

1.81

The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.

MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020

SMD = Standard Microcircuit Drawing

Description

ISL9105 is a 600mA, 1.6MHz step-down regulator that is ideal for powering low-voltage microprocessors in handheld devices such as PDAs and cellular phones. It is optimized for generating low output voltages down to 0.8V. The supply voltage range is from 2.7V to 5.5V, allowing for the use of a single Li+ cell, three NiMH cells or a regulated 5V input. It has a guaranteed minimum output current of 600mA. 1.6MHz pulse-width modulation (PWM) switching frequency allows for use of small external components. It has flexible operation mode selection of forced PWM mode and low IQ mode with typical 25μA quiescent current for highest light load efficiency to maximize battery life.

The ISL9105 includes a pair of low ON-resistance P-Channel and N-Channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty-cycle operation allows less than 200mV dropout voltage at 600mA output current.

The ISL9105 offers a typical 216ms Power-On-Reset (POR) timer at power-up. The timer output can be reset by RSI. When shutdown, ISL9105 discharges the output capacitor. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown.

The ISL9105 is offered in a 2mmx3mm 8 Ld DFN package with 1mm maximum height. The complete converter occupies less than 1cm² area.

Key Features

High Efficiency Synchronous Buck Regulator with up to 95% Efficiency
Selectable Forced PWM Mode and SKIP Mode
25μA Quiescent Supply Current in SKIP Mode
2.7V to 5.5V Supply Voltage
216ms POR Timer
3% Output Accuracy Over Temperature/Line/Load
600mA Guaranteed Output Current
Less than 1μA Logic Controlled Shutdown Current
100% Maximum Duty Cycle for Lowest Dropout
Discharge Output Capacitor when Shutdown
Internal Loop Compensation
Internal Digital Soft-Start
Peak Current Limit Protection, Short Circuit Protection
Over-Temperature Protection
Enable
Small 8 Ld 2mmx3mm DFN
Pb-free (RoHS Compliant)

Related Documentation

Datasheet(s):
600mA Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator

Evaluation Board(s):
ISL9105EVAL1Z Evaluation Board Application Manual

Parametric Data


V_IN (min) (V)		2.7

V_IN (max) (V)		5.5

V_OUT (min) (V)		.8

V_OUT (max) (V)		V_IN

I_OUT (max) (A)		.6

Iq (µA)		25

Switching Frequency (MHz)		1.6

Peak Efficiency (%)		96

POR		Y

BOM Total Footprint		0.17" x 0.45"

Application Block Diagrams

Applications

Single Li-Ion Battery-Powered Equipment
DSP Core Power
PDAs and Palmtops

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