ISL8009A Datasheet, PDF (1/13 Pages) Intersil Corporation – 1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator

1.5A Low Quiescent Current 1.6MHz High
Efficiency Synchronous Buck Regulator
ISL8009A
The ISL8009A is a high efficiency, monolithic,
synchronous step-down DC/DC regulator that can deliver
up to 1.5A continuous output current. It is optimized for
generating low output voltages down to 0.8V. The supply
voltage range of 2.7V to 5.5V, allows the use of single
Li+cell, three NiMH cells or a regulated 5V input. The
ISL8009A uses current mode control architecture to
deliver very low duty cycle operation at high frequency
with fast transient response and excellent loop stability.
It has flexible operation mode selection of forced PWM
mode and automatic PFM/PWM with as low as 17µA
quiescent current, achieving high power conversion
efficiency under light load condition, hence maximizing
battery life. High 1.6MHz pulse-width modulation (PWM)
switching frequency allows the use of small external
components.
The ISL8009A integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The
100% duty-cycle operation allows less than 400mV
dropout voltage at 1.5A output current.
The ISL8009A offers a 2ms Power-On-Reset (POR) timer
at power-up. The timer output can be reset by RSI.
When shutdown, ISL8009A discharges the output
capacitor through a 100Ω resistor. Other features include
internal digital soft-start, enable for power sequence,
overcurrent protection, and thermal shutdown.
The ISL8009A is offered in a 2mmx3mm 8 Ld DFN
package with 1mm maximum height. The complete
converter occupies less than 1cm² area.
Features
• High Efficiency Synchronous Buck Regulator with up
to 95% Efficiency
• 2ms Reset Timer
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over-Temperature/Load/Line
• 1.5A Guaranteed Output Current
• 17µA Quiescent Supply Current in PFM Mode
• Selectable Forced PWM Mode and PFM Mode
• Less Than 1µA Logic Controlled Shutdown Current
• 90% Maximum Duty Cycle for Lowest Dropout at
1.5A
• Internal Current Mode Compensation
• Internal Digital Soft-Start
• Peak Current Limiting, Short Circuit Protection
• Over-Temperature Protection
• Enable
• Soft Discharge Disable
• Small 8 Ld 2mmx3mm DFN
• Pb-Free (RoHS Compliant)
Applications
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
• Portable Instruments
• Test and Measurement Systems
Pin Configuration
ISL8009A
(8 LD DFN)
TOP VIEW
VIN ₁
EN 2
POR 3
SKIP 4
8 ^LX
7 GND
6 VFB
5 RSI
*EXPOSED PAD MUST BE CONNECTED
TO THE GND PIN*
November 19, 2009
FN6656.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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