MAX1845EEImaxim美信芯片电子元器件中文版规格手册.pdf资源-CSDN文库

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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.

General Description

The MAX1845 is a dual PWM controller configured for

step-down (buck) topologies that provides high efficien-

cy, excellent transient response, and high DC output

accuracy necessary for stepping down high-voltage bat-

teries to generate low-voltage chipset and RAM power

supplies in notebook computers. The CS_ inputs can be

used with low-side sense resistors to provide accurate

current limits or can be connected to LX_, using low-side

MOSFETs as current-sense elements.

The on-demand PWM controllers are free running, con-

stant on-time with input feed-forward. This configuration

provides ultra-fast transient response, wide input-output

differential range, low supply current, and tight load-reg-

ulation characteristics. The MAX1845 is simple and easy

to compensate.

Single-stage buck conversion allows the MAX1845 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 bat-

tery at a higher switching frequency) allows the minimum

possible physical size.

The MAX1845 is intended for generating chipset, DRAM,

CPU I/O, or other low-voltage supplies down to 1V. For a

single-output version, refer to the MAX1844 data sheet.

The MAX1845 is available in 28-pin QSOP and 36-pin

thin QFN packages.

Applications

Notebook Computers

CPU Core Supplies

Chipset/RAM Supply as Low as 1V

1.8V and 2.5V I/O Supplies

Features

♦ Ultra-High Efficiency

♦ Accurate Current-Limit Option

♦ Quick-PWM™ with 100ns Load-Step Response

♦ 1% V

OUT

Accuracy over Line and Load

♦ Dual Mode™ Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs

♦ Adjustable 1V to 5.5V Output Range

♦ 2V to 28V Battery Input Range

♦ 200/300/420/540kHz Nominal Switching Frequency

♦ Adjustable Overvoltage Protection

♦ 1.7ms Digital Soft-Start

♦ Drives Large Synchronous-Rectifier FETs

♦ Power-Good Window Comparator

♦ 2V ±1% Reference Output

MAX1845

Dual, High-Efficiency, Step-Down

Controller with Accurate Current Limit

________________________________________________________________ Maxim Integrated Products 1

19-1955; Rev 2; 1/03

Pin Configurations appear at end of data sheet.

Quick-PWM and Dual Mode are trademarks of Maxim Integrated

Products.

EVALUATION KIT

AVAILABLE

OUTPUT1

1.8V

BATTERY

4.5V TO 28V

ILIM1

ON2

DL1

TON

OUT1

LX1

DH1

FB1

GND

BST1

ILIM2

ON1

REF

DL2

CS2

OUT2

LX2

DH2

FB2

V+

BST2

SKIP

5V INPUT

PGOOD

OUTPUT2

2.5V

MAX1845EEI

UVP

OVP

CS1

Minimal Operating Circuit

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX1845EEI

-40°C to +85°C 28 QSOP

MAX1845ETX

-40°C to +85°C

36 Thin QFN

6mm

✕ 6mm

MAX1845

Dual, High-Efficiency, Step-Down

Controller with Accurate Current Limit

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

V+ to AGND..............................................................-0.3 to +30V

to AGND............................................................-0.3V to +6V

to PGND............................................................-0.3V to +6V

AGND to PGND .....................................................-0.3V to +0.3V

PGOOD, OUT_ to AGND..........................................-0.3V to +6V

OVP, UVP, ILIM_, FB_, REF,

SKIP, TON, ON_ to AGND......................-0.3V to (V

+ 0.3V)

DL_ to PGND..............................................-0.3V to (V

+ 0.3V)

BST_ to AGND........................................................-0.3V to +36V

CS_ to AGND.............................................................-6V to +30V

DH1 to LX1 ..............................................-0.3V to (V

BST1

+ 0.3V)

LX_ to BST_ ..............................................................-6V to +0.3V

DH2 to LX2 ..............................................-0.3V to (V

BST2

+ 0.3V)

REF Short Circuit to GND ...........................................Continuous

Continuous Power Dissipation (T

= +70°C)

28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW

36-Pin 6mm

6mm Thin QFN

(derate 26.3mW/°C above +70°C).............................2105mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V

= V

= 5V, SKIP = AGND, V+ = 15V, T

= 0°C to +85°C, typical values are at +25°C, unless otherwise

noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

PWM CONTROLLERS

V+ Battery voltage, V+ 2 28

Input Voltage Range

, V

4.5 5.5

FB1 to AGND

1.782

1.8

1.818

FB1 to V

1.485

1.5

1.515

V+ = 2V to 28V, I

LOAD

= 0 to 8A, SKIP = V

+25°C to +85°C

FB1 to OUT1

0.99

1.01

FB1 to AGND

1.773

1.8

1.827

FB1 to V

1.477

1.5

1.523

DC Output Voltage OUT1

(Note 2)

OUT1

V+ = 2V to 28V, I

LOAD

= 0 to 8A, SKIP = V

0°C to +85°C

FB1 to OUT1

0.985

1.015

FB2 to AGND

2.475

2.5

2.525

V+ = 4.5V to 28V,

LOAD

= 0 to 4A,

SKIP = V

+25°C to +85°C

FB2 to OUT2

0.99

1.01

FB2 to AGND

2.463

2.5

2.537

DC Output Voltage OUT2

(Note 2)

OUT2

V+ = 4.5V to 28V,

LOAD

= 0 to 4A,

SKIP = V

0°C to +85°C

FB2 to OUT2

0.985

1.015

Output Voltage Adjust Range OUT1, OUT2 1 5.5 V

Dual-Mode Threshold, Low OVP, FB_

0.05

0.1

0.15

OVP, ILIM_

1.5

0.4

Dual-Mode Threshold, High

FB1 1.9 2.0 2.1

OUT1

= 1.5V 75

OUT_ Input Resistance

OUT2

= 2.5V 100

kΩ

FB_ Input Bias Current I

-0.1

0.1 µA

Soft-Start Ramp Time Zero to full ILIM

1700

µs

Note 1: For the MAX1845EEI, AGND and PGND refer to a single pin designated GND.

MAX1845

Dual, High-Efficiency, Step-Down

Controller with Accurate Current Limit

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

= V

= 5V, SKIP = AGND, V+ = 15V, T

= 0°C to +85°C, typical values are at +25°C, unless otherwise

noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TON = AGND 120 137

153

TON = REF 153 174

195

TON = float 222 247

272

On-Time, Side 1 (Note 3) t

ON1

V+ = 24V,

OUT1

= 2V

TON = V

316 353

390

TON = AGND 160 182

204

TON = REF 205 234

263

TON = float 301 336

371

On-Time, Side 2 (Note 3) t

ON2

V+ = 24V,

OUT2

= 2V

TON = V

432 483

534

TON = AGND 125 135

145

TON = REF 125 135

145

TON = float 125 135

145

On-Time Tracking (Note 3)

On-time 2 with

respect to on-

time 1

TON = V

125 135

145

Minimum Off-Time (Note 3) t

OFF

400

500

Quiescent Supply Current (V

FB_ forced above the regulation point

1100 1500

µA

Quiescent Supply Current (V

FB_ forced above the regulation point <1 5 µA

Quiescent Supply Current (V+) I+ Measured at V+ 25 70 µA

ON1 = ON2 = AGND, OVP = V

or AGND <1 5

Shutdown Supply Current (V

)

ON1 = ON2 = AGND, V

OVP

= 1.8V 1 5

µA

Shutdown Supply Current (V

) ON1 = ON2 = AGND <1 5 µA

Shutdown Supply Current (V+)

ON1 = ON2 = AGND, measured at V+,

= AGND or 5V

<1 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, no external REF load

1.98

2.02

Reference Load Regulation I

REF

= 0 to 50µA

0.01

REF Sink Current REF in regulation 10 µA

REF Fault Lockout Voltage Falling edge, hysteresis = 40mV 1.6 V

Overvoltage Trip Threshold

(Fixed-Threshold Mode)

OVP = AGND, with respect to error-

comparator trip threshold

112 114

117

1V < V

OVP

< 1.8V, external feedback,

measured at FB_ with respect to V

OVP

-28 0 28 mV

Overvoltage Comparator Offset

(Adjustable-Threshold Mode)

1V < V

OVP

< 1.8V, internal feedback,

measured at OUT_ with respect to OUT_

regulation point

-3.5

+3.5

OVP Input Leakage Current 1V < V

OVP

< 1.8V

-100

100

Overvoltage Fault Propagation

Delay

FB_ forced 2% above trip threshold 1.5 µs

Output Undervoltage Threshold

UVP = V

, with respect to error-comparator

trip threshold

65 70 75 %

Output Undervoltage Protection

Blanking Time

From ON_ signal going high 10 30 ms

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