ISL6273 Datasheet, PDF (1/12 Pages) Intersil Corporation – 1.2A Low Quiescent Current 1.5MHz High Efficiency Synchronous Buck Regulator

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Data Sheet
March 7, 2006
ISL6273
FN9256.0
1.2A Low Quiescent Current 1.5MHz High
Efficiency Synchronous Buck Regulator
ISL6273 is a 1.2A, 1.5MHz step-down regulator, which is
ideal for powering low-voltage microprocessors in compact
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 the use of a
single Li+ cell, three NiMH cells or a regulated 5V input. It
has guaranteed minimum output current of 1.2A. 1.5MHz
pulse-width modulation (PWM) switching frequency allows
using small external components. It has flexible operation
mode selection of forced PWM mode and low IQ mode with
as low as 25µA quiescent current for highest light load
efficiency to maximize battery life.
The ISL6273 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 1.2A.
The ISL6273 offers a 200ms Power-On-Reset (POR) timer
at power up. The timer output can be reset by RSI. When
shutdown, ISL6273 discharges the output capacitor. Other
features include internal digital soft-start, enable for power
sequence, overcurrent protection, and thermal shutdown.
The ISL6273 is offered in a 10 Ld 3x3mm DFN package with
1mm maximum height. The complete converter occupies
less than 1 cm² area.
Ordering Information
PART
NUMBER
(NOTE)
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL6273IRZ 273Z
-40 to 85 10 Ld 3x3 DFN L10.3x3C
ISL6273IRZ-T 273Z
-40 to 85 10 Ld 3x3 DFN L10.3x3C
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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 requirements of
IPC/JEDEC J STD-020.
Features
• High efficiency Synchronous Buck Regulator with up to
95% Efficiency
• 200ms Reset Timer
• Discharge Output Cap when Shutdown
• 2.7V to 5.5V Supply Voltage
• 3% Output Accuracy Over Temperature/Load/Line
• 1.2A Guaranteed Output Current
• 25µA Quiescent Supply Current in IQ Mode
• Selectable Forced PWM Mode and IQ Mode
• Less than 1µA Logic Controlled Shutdown Current
• 100% Maximum Duty Cycle for Lowest Dropout
• Internal Loop Compensation
• Internal Digital Soft-Start
• Peak Current Limiting, Short Circuit Protection
• Over-Temperature Protection
• Enable
• Small 10 Ld 3x3mm DFN
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Single Li-Ion Battery-Powered Equipment
• DSP Core Power
• PDAs and Palmtops
Pinout
ISL6273 (10 LD 3X3 DFN)
TOP VIEW
PVIN 1
VCC 2
EN 3
POR 4
MODE 5
10 PHASE
9 PGND
8 SGND
7 FB
6 RSI
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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