DATASHEET ISL9105 FN6415 Rev 2.00 600mA Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck March 28, 2008 Regulator ISL9105 is a 600mA, 1.6MHz step-down regulator that is Features ideal for powering low-voltage microprocessors in handheld High Efficiency Synchronous Buck Regulator with up to devices such as PDAs and cellular phones. It is optimized 95% Efficiency 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 Selectable Forced PWM Mode and SKIP Mode single Li+ cell, three NiMH cells or a regulated 5V input. It 25A Quiescent Supply Current in SKIP Mode has a guaranteed minimum output current of 600mA. 1.6MHz pulse-width modulation (PWM) switching frequency 2.7V to 5.5V Supply Voltage allows for use of small external components. It has flexible 216ms POR Timer operation mode selection of forced PWM mode and low IQ mode with typical 25A quiescent current for highest light 3% Output Accuracy Over Temperature/Line/Load load efficiency to maximize battery life. 600mA Guaranteed Output Current The ISL9105 includes a pair of low ON-resistance Less than 1A Logic Controlled Shutdown Current P-Channel and N-Channel internal MOSFETs to maximize efficiency and minimize external component count. 100% 100% Maximum Duty Cycle for Lowest Dropout duty-cycle operation allows less than 200mV dropout voltage Discharge Output Capacitor when Shutdown at 600mA output current. Internal Loop Compensation The ISL9105 offers a typical 216ms Power-On-Reset (POR) timer at power-up. The timer output can be reset by RSI. Internal Digital Soft-Start When shutdown, ISL9105 discharges the output capacitor. Peak Current Limit Protection, Short Circuit Protection Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal Over-Temperature Protection shutdown. Enable The ISL9105 is offered in a 2mmx3mm 8 Ld DFN package Small 8 Ld 2mmx3mm DFN with 1mm maximum height. The complete converter 2 occupies less than 1cm area. Pb-free (RoHS Compliant) Ordering Information Applications TEMP. Single Li-Ion Battery-Powered Equipment PART NUMBER PART RANGE PACKAGE PKG. DSP Core Power (NOTE) MARKING (C) (Pb-free) DWG. PDAs and Palmtops ISL9105IRZ-T* 05Z -40 to +85 8 Ld 2x3 DFN L8.2x3 *Please refer to TB347 for details on reel specifications. Pinout NOTE: These Intersil Pb-free plastic packaged products employ ISL9105 special Pb-free material sets molding compounds/die attach materials (8 LD DFN) and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which TOP VIEW is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb- free peak reflow temperatures that meet or exceed the Pb-free VIN PHASE 1 8 requirements of IPC/JEDEC J STD-020. EN 2 7 GND POR FB 3 6 MODE 4 5 RSI FN6415 Rev 2.00 Page 1 of 11 March 28, 2008ISL9105 Absolute Maximum Ratings (Reference to GND) Thermal Information Supply Voltage (VIN) -0.3V to 6.5V Thermal Resistance (Typical, Notes 1, 2) (C/W) (C/W) JA JC EN, RSI, MODE, POR . -0.3V to VIN+0.3V 2x3 DFN Package 75 6 PHASE . -1.5V to 6.5V Junction Temperature Range -55C to +125C FB -0.3V to 2.7V Storage Temperature Range -65C to +150C Pb-free reflow profile see link below Recommended Operating Conditions