廬
ISL6271A
Data Sheet
October 8, 2004
FN9171.1
Integrated XScale Regulator
The ISL6271A is a versatile power management IC (PMIC)
designed for the Xscale type of processors. The device
integrates three regulators, two fault indicators and an I
2
C
bus for communication with a host microprocessor. Two of
the three regulators function as low power, low drop out
regulators, designed to power SRAM and phase-lock loop
circuitry internal to the Xscale processor. The third regulator
uses a proprietary switch-mode topology to power the
processor core and facilitate Dynamic Voltage Management
(DVM), as defined by Intel.
Since power dissipation inside a microprocessor is
proportional to the square of the core voltage, Intel XScale
processors implement DVM as a means to more efficiently
utilize battery capacity. To support this power saving
architecture, the ISL6271A integrates an I
2
C bus for
communication with the host processor. The processor, acting
as the bus master, transmits a 鈥渧oltage level鈥?and 鈥渧oltage
slew rate鈥?to the ISL6271A appropriate to the processing
requirements; higher core voltages support higher operating
frequencies and code execution. The bus is fully compliant
with the Phillips廬 I
2
C protocol and supports both standard
and fast data transmission modes. Alternatively, the output of
the core regulator can be programmed in 50mV increments
from 0.85V to 1.6V using the input Voltage ID (VID) pins. All
three regulators share a common enable pin and are
protected against overcurrent, over temperature and
undervoltage conditions. When disabled via the enable pin,
the ISL6271A enters a low power state that can be used to
conserve battery life while maintaining the last programmed
VID code and slew rate. An integrated soft-start circuit
transitions the ISL6271A output voltages to their default
values at a rate determined by an external soft-start capacitor.
Features
鈥?Three Voltage Regulators (1 Buck, 2 LDOs)
鈥?High-Efficiency, fully-Integrated synchronous buck
regulator with DVM
鈥?800mA DC output current for the buck regulator
鈥?Proprietary 鈥楽ynthetic Ripple鈥?Control Topology
鈥?Greater than 1MHz Switching Frequency
鈥?Diode emulation for light load efficiency
鈥?I
2
C Interface Module for DVM from 0.85V to 1.6V
鈥?Optional fixed 4-bit VID-control in lieu of DVM
鈥?Small Output Inductor and Capacitor
鈥?Battery Fault signal
鈥?Input Supply Voltage Range: 2.76V-5.5V
鈥?4x4 mm QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
鈥?Pb-free Available (RoHS Compliant)
Applications
鈥?PDA
鈥?Cell Phone
鈥?Tablet Devices
鈥?Embedded Processors
Related Literature
鈥?Technical Brief TB379 鈥淭hermal
Characterization of
Packaged Semiconductor Devices鈥?/div>
鈥?Technical Brief TB389 鈥淧CB
Land Pattern Design and
Surface Mount Guidelines for QFN Packages鈥?/div>
Pinout
ISL6271A (4x4 QFN)
TOP VIEW
BFLT#
BBAT
SOFT
GND
EN
鈥?Application Note AN1139
鈥淪etup Instruction for the
ISL6271 Evaluation Kit鈥?/div>
20
VCC
VIDEN
SCL/VID0
SDA/VID1
VID2
1
2
3
4
5
6
VID3
19
18
17
16
15 LVCC
14 VPLL
13 VSRAM
12 FB
11 VOUT
Ordering Information
PART NUMBER*
ISL6271ACR
ISL6271ACRZ (Note)
TEMP.
RANGE (擄C)
-25 to 85
-25 to 85
PACKAGE
20 Ld 4x4 QFN
20 Ld 4x4 QFN
(Pb-free)
PKG.
DWG. #
L20.4x4
L20.4x4
*Add 鈥?T鈥?suffix for tape and reel.
NOTE: Intersil Pb-free 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-020C.
7
PGND
8
PHASE
9
PVCC
10
PGOOD
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved
Intel廬 is a registered trademark of Intel Corporation. All other trademarks mentioned are the property of their respective owners.
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