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High-Efficiency,
Low-IQ PMIC |
The RS2586/RS2587 power-management
ICs are optimized for devices using Intel X-Scale®
microprocessors, including third-generation smart cell phones, PDAs, internet appliances, and other portable devices requiring
substantial computing and multimedia capability at low power.
The ICs integrate seven high-performance, low-operating-current
power supplies along with supervisory and management 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 values. The DRAM supply on the RS2586A and RS2587A is
preset for 1.8V or 2.5V, while the RS2586B 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 voltage 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 control for all DC-DC
converters, low-battery and dead-battery 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-frequency PWM
control and automatically switch from PWM to skip-mode operation
at light loads to reduce operating current and extend battery
life. The core output 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 RS2587 is available in a tiny 6mm x 6mm,
40-pin thin QFN package. The RS2586 features an additional
linear regulator (V6) for VCC_USIM and low-battery and dead-
battery comparators. The RS2586 is available in a 7mm x 7mm,
48-pin thin QFN package.
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Key Features |
- Six
Regulators in One Package:
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Step-Down DC-DC for I/O at 1.3A
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Step-Down DC-DC for Memory at 0.9A
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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
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Key Specifications:
Switch-Mode DC-DC Power Supplies |
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Part Number |
VIN (min) (V) |
VIN (max) (V) |
Number of DC-DC Outputs |
D/VID Prog Output |
Min. Adj. VOUT
(V) |
Max. Adj. VOUT
(V) |
IOUT (A) |
Operating Current, ICC
(max) (mA) |
Fixed Freq/PWM Operation |
Operating Freq. (kHz) |
Internal Power Switch(es) |
Synchronous Rectifier |
Min. Foot-
print (mm2) |
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RS2586A |
2.6 |
5.5 |
3 |
Yes |
0.7 |
5.5 |
1.2 |
0.06 |
Yes |
1000 |
Yes |
Yes |
50 |
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RS2586B
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50 |
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RS2586C
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50 |
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RS2587A
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37 |
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RS2587C
|
37 |
EvalKit
The RS2586A evaluation kit (EV kit) is a fully assembled and
tested surface-mount PCB that evaluates the RS2586A
power-management IC (PMIC). The IC is optimized for
microprocessor-based applications. The RS2586A integrates three
high-performance synchronous step-down DC-DC power supplies,
three low-dropout (LDO) regulators, a battery backup supply, and
various power-management functions.
The RS2586A evaluation system (EV system) consists of a RS2586A
evaluation kit.
The SMBus™ interface board allows a PC to use its USB port to
emulate an SMBus/I²C-compatible 2-wire interface. Windows®
98SE/2000/XP-compatible software provides a professional
interface to exercise the features of the RS2586A. The program
is menu driven and offers a graphical user interface (GUI) with
control buttons and a status display.
The RS2586AEV includes both the EV kit interface board. Order
the RS2586A EV kit if you already have an SMBus interface.
Price(US$)
|
Module |
1 - 10
pcs. |
11 - 999
pcs. |
1k - 9999
pcs. |
¡Ý 10k
pcs. |
|
RS258x |
25 |
21 |
15 |
8 |
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