Rainbow Electronics MAX1587A - Manual

General Description
The MAX1586/MAX1587 power-management ICs are
optimized for devices using Intel X-Scale™ micro-
processors, including third-generation smart cell
phones, PDAs, internet appliances, and other portable
devices requiring substantial computing and multime-
dia capability at low power.
The ICs integrate seven high-performance, low-operating-
current power supplies along with supervisory and man-
agement functions. Regulator outputs include three step-
down DC-DC outputs, three linear regulators, and a
seventh always-on output. DC-DC converter outputs
power I/O, DRAM, and the CPU core. The I/O supply can
be preset to 3.3V or 3.0V, or can be adjusted to other val-
ues. The DRAM supply on the MAX1586A and MAX1587A
is preset for 1.8V or 2.5V, while the MAX1586B DRAM
supply is preset for 3.3V or 2.5V. The DRAM supply on all
parts can also be adjusted with external resistors. The
CPU core supply is serial programmed for dynamic volt-
age management. Linear-regulated outputs are provided
for SRAM, PLL, and USIM supplies.
To minimize sleep-state quiescent current, critical
power supplies have bypass “sleep” LDOs that can be
activated to minimize battery drain when output current
is very low. Other functions include separate on/off con-
trol for all DC-DC converters, low-battery and dead-bat-
tery detection, a reset and power-OK output, a backup-
battery input, and a two-wire serial interface.
All DC-DC outputs use fast, 1MHz PWM switching and
small external components. They operate with fixed-fre-
quency PWM control and automatically switch from
PWM to skip-mode operation at light loads to reduce
operating current and extend battery life. The core out-
put is capable of operating in forced-PWM mode at all
loads to minimize ripple and noise. A 2.6V to 5.5V input
voltage range allows 1-cell lithium-ion (Li+), 3-cell
NiMH, or a regulated 5V input. The MAX1587 is avail-
able in a tiny 6mm x 6mm, 40-pin thin QFN package.
The MAX1586 features an additional linear regulator
(V6) for VCC_USIM and low-battery and dead- battery
comparators. The MAX1586 is available in a 7mm x
7mm, 48-pin thin QFN package.
Applications
PDA, Palmtop, and Wireless Handhelds
Third-Generation Smart Cell Phones
Internet Appliances and Web-Books
Features
♦ Six Regulators in One Package:
Step-Down DC-DC for I/O at 1.3A
Step-Down DC-DC for Memory at 0.9A
Step-Down Serial-Programmed DC-DC for CORE
Three LDO Outputs for SRAM, PLL, and USIM
Always-On Output for VCC_BATT
♦ Low Operating Current
60µA in Sleep Mode (Sleep LDOs On)
130µA with DC-DCs On (Core Off)
200µA All Regulators On, No Load
5µA Shutdown Current
♦ Optimized for X-Scale Processors
♦ Backup-Battery Input
♦ Separate ON Controls for Any Desired Power
Sequencing
♦ 1MHz PWM Switching Allows Small External
Components
♦ Tiny 6mm x 6mm, 40-Pin and 7mm x 7mm, 48-Pin
Thin QFN Packages
MAX1586A/MAX1586B/MAX1587A
High-Efficiency, Low-I
Q
PMICs with
Dynamic Core for PDAs and Smart Phones
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX1586
MAX1587
V1
V2
V3
V4
V5
V6
V7
VCC_IO 3.3V
VCC_MEM 2.5V
VCC_CORE
0.8V TO 1.3V
VCC_USIM
0V, 1.8V, 3.0V
MAIN BATTERY
VCC_PLL 1.3V
VCC_SRAM 1.1V
BACKUP
BATTERY
IN
BKBT
MR
RSO
VCC_BATT
POK
nRESET
nVCC_FAULT
SYS_EN
PWR_EN
ON1-2
ON3-6
nBATT_FAULT DBO
Simplified Functional Diagram
19-3089; Rev 1; 12/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Pin Configurations appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX1586A ETM -40°C to +85°C 48 Thin QFN 7mm x 7mm
MAX1586B ETM -40°C to +85°C 48 Thin QFN 7mm x 7mm
MAX1587A ETL -40°C to +85°C 40 Thin QFN 6mm x 6mm
X-Scale is a trademark of Intel Corp.