Rainbow-electronics MAX1545 User Manual download pdf

General Description

The MAX1519/MAX1545 are dual-phase, Quick-PWM™,

step-down controllers for desktop and mobile Pentium

(P4) CPU core supplies. Dual-phase operation reduces

input ripple current requirements and output voltage rip-

ple while easing component selection and layout difficul-

ties. The Quick-PWM control scheme provides

instantaneous response to fast load-current steps. The

MAX1519/MAX1545 include active voltage positioning

with adjustable gain and offset, reducing power dissipa-

tion and bulk output capacitance requirements.

The MAX1519/MAX1545 are intended for two different

notebook CPU core applications: stepping down the bat-

tery directly or stepping down the 5V system supply to

create the core voltage. The single-stage conversion

method allows these devices to directly step down high-

voltage batteries for the highest possible efficiency.

Alternatively, two-stage conversion (stepping down the

5V system supply instead of the battery) at a higher

switching frequency provides the minimum possible

physical size.

The MAX1519/MAX1545 comply with Intel’s P4 specifi-

cations. The switching regulator features soft-start,

power-up sequencing, and soft-shutdown. The

MAX1519/MAX1545 also feature independent four-level

logic inputs for setting the suspend voltage (S0–S1).

The MAX1519/MAX1545 include output undervoltage

protection (UVP), thermal protection, and voltage regula-

tor power-OK (VROK) output. When any of these protec-

tion features detect a fault, the controller shuts down.

Additionally, the MAX1519/MAX1545 include overvoltage

protection.

The MAX1519/MAX1545 are available in low-profile, 40-

pin, 6mm x 6mm thin QFN packages. For other CPU

platforms, refer to the pin-to-pin compatible MAX1544

and MAX1532/MAX1546/MAX1547 data sheets.

Applications

Desktop and Mobile P4 Computers

Multiphase CPU Core Supply

Voltage-Positioned Step-Down Converters

Servers/Desktop Computers

Low-Voltage, Digitally Programmable Power

Supplies

Features

♦ Dual-Phase, Quick-PWM Controllers

♦ ±0.75% V

OUT

Accuracy Over Line, Load, and

Temperature (1.3V)

♦ Active Voltage Positioning with Adjustable Gain

and Offset

♦ 5-Bit On-Board DAC

Mobile: 0.60V to 1.75V Output Range

Desktop: 1.10V to 1.85V Output Range

♦ Selectable 100kHz/200kHz/300kHz/550kHz

Switching Frequency

♦ 4V to 28V Battery Input Voltage Range

♦ Adjustable Slew-Rate Control

♦ Drive Large Synchronous Rectifier MOSFETs

♦ Output Overvoltage Protection (MAX1545 Only)

♦ Undervoltage and Thermal-Fault Protection

♦ Power Sequencing and Timing

♦ Selectable Suspend Voltage (0.675V to 1.45V)

♦ Soft-Shutdown

♦ Selectable Single- or Dual-Phase Pulse Skipping

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

________________________________________________________________ Maxim Integrated Products 1

DLM

LXM

BSTM

VROK

DHM

SUS

OFS

REF

ILIM

TON

TIME

OAIN-

OAIN+

CODE

CCI

GNDS

CCV

GND

CSN

CMN

CMP

V+

BSTS

LXS

DHS

DLS

PGND

CSP

THIN QFN

MAX1519

MAX1545

TOP VIEW

SHDN

SKIP

Pin Configuration

Ordering Information

19-2734; Rev 1; 9/03

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

PART TEMP RANGE PIN-PACKAGE

MAX1519ETL -40°C to +100°C 40 Thin QFN 6mm

✕ 6mm

MAX1545ETL -40°C to +100°C 40 Thin QFN 6mm ✕ 6mm

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

Pentium is a registered trademark of Intel Corp.

1 2 3 4 5 6 ... 42 43

MAX1519/MAX1545 1

Summary of Contents

Page 1 - MAX1519/MAX1545

General DescriptionThe MAX1519/MAX1545 are dual-phase, Quick-PWM™,step-down controllers for desktop and mobile Pentium®4(P4) CPU core supplies. Dual-p

Page 2

Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 se

Page 3

Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 se

Page 4

Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 se

Page 5

Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 se

Page 6

MAX1519/MAX1545Dual-Phase, Quick-PWM Controllers forProgrammable CPU Core Power Supplies14 ___________________________________________________________

Page 7