MAX1636 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1636

Low-Voltage, Precision Step-Down Controller for Portable CPU Power

Maxim Integrated 

19-1268; Rev 3; 8/05

EVAALVUAAILTAIOBNLEKIT

Low-Voltage, Precision Step-Down

Controller for Portable CPU Power

General Description

The MAX1636 is a synchronous, buck, switch-mode,

power-supply controller that generates the CPU supply

voltage in battery-powered systems. It achieves ±1%

output voltage accuracy and offers the excellent load-

transient response needed by upcoming generations of

dynamic-clock CPUs.

Up to 95% efficiency is achieved through synchronous

rectification and Maxim’s proprietary Idle Mode™ con-

trol scheme. Efficiency is greater than 80% over a

1000:1 load-current range, extending battery life in sys-

tem-suspend or standby modes. Excellent dynamic

response corrects output load transients caused by the

latest dynamic-clock CPUs within five 300kHz clock

cycles. Strong, 1A, on-board gate drivers ensure fast,

external N-channel MOSFET switching.

The MAX1636 features a logic-controlled and synchro-

nizable, fixed-frequency, pulse-width-modulation (PWM)

operating mode that reduces noise and RF interference

in sensitive mobile communications and pen-entry appli-

cations. Holding SKIP high forces fixed-frequency mode

for lowest noise under all load conditions.

For a low-cost version that omits the +5V VL linear-

regulator block and comes in a smaller 16-pin QSOP

package, refer to the MAX1637 data sheet.

Applications

Notebook Computers

Subnotebook Computers

Desktop Computers

Bus-Termination Supplies

Pin Configuration

Features

♦ ±1% DC Accuracy (Adjustable Mode)

♦ Output Overvoltage Crowbar Protection

♦ Output Undervoltage Shutdown

♦ Adjustable Switching Frequency to 340kHz

♦ Low-Dropout Operation

♦ Idle Mode Pulse-Skipping Operation

♦ 1.10V to 5.5V Adjustable Output Voltage

♦ 2.5V/3.3V Dual-Mode Fixed-Output Settings

♦ Internal Digital Soft-Start

♦ 1.1V ±1% Reference Output

♦ 3μA (typ) Shutdown Current

♦ Open-Drain Power-Good Output (RESET)

♦ 20-Pin SSOP Package

Ordering Information

PART

MAX1636EAP

MAX1636EAP+

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

20 SSOP

20 SSOP

+Denotes lead-free package.

Typical Operating Circuit

VIN

V+ SHDN OVP

VL

VCC

TOP VIEW

CSH 1

CSL 2

RESET 3

SHDN 4

OVP 5

CC 6

REF 7

SYNC 8

GND 9

GND 10

MAX1636

20 SKIP

19 LX

18 DH

17 BST

16 PGND

15 DL

14 VL

13 V+

12 VCC

11 FB

SSOP

Idle Mode is a trademark of Maxim Integrated Products.

CC

DH

BST

LX

MAX1636

DL

SKIP

SYNC

GND

PGND

CSH

CSL

REF

FB

RESET

GND

TO μP

________________________________________________________________ Maxim Integrated Products 1

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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