MAX1631EAI+ Datasheet MAX1632EAI+, MAX1634CAI+, MAX1631EAI+ | P1-P3

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 MAX1630–MAX1635 are buck-topology, step-down,

switch-mode, power-supply controllers that generate

logic-supply voltages in battery-powered systems. These

high-performance, dual/triple-output devices include on-

board power-up sequencing, power-good signaling with

delay, digital soft-start, secondary winding control, low-

dropout circuitry, internal frequency-compensation net-

works, and automatic bootstrapping.

Up to 96% efficiency is achieved through synchronous

rectification and Maxim’s proprietary Idle Mode™ control

scheme. Efficiency is greater than 80% over a 1000:1

load-current range, which extends battery life in system-

suspend or standby mode. 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.

These devices feature a logic-controlled and synchroniz-

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

operating mode. This reduces noise and RF interference

in sensitive mobile communications and pen-entry appli-

cations. Asserting the SKIP pin enables fixed-frequency

mode, for lowest noise under all load conditions.

The MAX1630–MAX1635 include two PWM regulators,

adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V

modes. All these devices include secondary feedback

regulation, and the MAX1630/MAX1632/MAX1633/

MAX1635 each contain 12V/120mA linear regulators. The

MAX1631/MAX1634 include a secondary feedback input

(SECFB), plus a control pin (STEER) that selects which

PWM (3.3V or 5V) receives the secondary feedback sig-

nal. SECFB provides a method for adjusting the sec-

ondary winding voltage regulation point with an external

resistor divider, and is intended to aid in creating auxiliary

voltages other than fixed 12V.

The MAX1630/MAX1631/MAX1632 contain internal out-

put overvoltage and undervoltage protection features.

________________________Applications

Notebook and Subnotebook Computers

PDAs and Mobile Communicators

Desktop CPU Local DC-DC Converters

____________________________Features

♦ 96% Efficiency

♦ +4.2V to +30V Input Range

♦ 2.5V to 5.5V Dual Adjustable Outputs

♦ Selectable 3.3V and 5V Fixed or Adjustable

Outputs (Dual Mode™)

♦ 12V Linear Regulator

♦ Adjustable Secondary Feedback

(MAX1631/MAX1634)

♦ 5V/50mA Linear Regulator Output

♦ Precision 2.5V Reference Output

♦ Programmable Power-Up Sequencing

♦ Power-Good (RESET) Output

♦ Output Overvoltage Protection

(MAX1630/MAX1631/MAX1632)

♦ Output Undervoltage Shutdown

(MAX1630/MAX1631/MAX1632)

♦ 200kHz/300kHz Low-Noise, Fixed-Frequency

Operation

♦ Low-Dropout, 99% Duty-Factor Operation

♦ 2.5mW Typical Quiescent Power (+12V input, both

SMPSs on)

♦ 4μA Typical Shutdown Current

♦ 28-Pin SSOP Package

MAX1630–MAX1635

Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

________________________________________________________________ Maxim Integrated Products 1

LINEAR

12V

LINEAR

POWER-UP

SEQUENCE

POWER-

GOOD

3.3V

SMPS

RESETON/OFF

+5V (RTC)

+3.3V

INPUT

+5V

+12V

________________Functional Diagram

19-0480; Rev 4; 8/05

EVALUATION KIT

AVAILABLE

_______________Ordering Information

Ordering Information continued at end of data sheet.

Pin Configurations and Selector Guide appear at end of data

sheet.

Idle Mode and Dual Mode are trademarks of Maxim Integrated

Products.

+ Denotes lead-free package.

PART TEMP RANGE

PIN-PACKAGE

MAX1630CAI 0°C to +70°C 28 SSOP

MAX1630CAI+ 0°C to +70°C 28 SSOP

MAX1630EAI+ -40°C to +85°C 28 SSOP

MAX1630–MAX1635

Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, T

= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

= +25°C.)

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 GND ..............................................................-0.3V to +36V

PGND to GND.....................................................................±0.3V

VL to GND ................................................................-0.3V to +6V

BST3, BST5 to GND ...............................................-0.3V to +36V

LX3 to BST3..............................................................-6V to +0.3V

LX5 to BST5..............................................................-6V to +0.3V

REF, SYNC, SEQ, STEER, SKIP, TIME/ON5,

SECFB, RESET to GND ............................................-0.3V to +6V

to GND............................................................-0.3V to +20V

RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V)

12OUT to GND ...........................................-0.3V to (V

+ 0.3V)

DL3, DL5 to PGND........................................-0.3V to (VL + 0.3V)

DH3 to LX3 ...............................................-0.3V to (BST3 + 0.3V)

DH5 to LX5 ...............................................-0.3V to (BST5 + 0.3V)

VL, REF Short to GND ................................................Momentary

12OUT Short to GND..................................................Continuous

REF Current...........................................................+5mA to -1mA

VL Current.........................................................................+50mA

12OUT Current ...............................................................+200mA

Shunt Current............................................................+15mA

Operating Temperature Ranges

MAX163_CAI.......................................................0°C to +70°C

MAX163_EAI....................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Continuous Power Dissipation (T

= +70°C)

SSOP (derate 9.52mW/°C above +70°C) ....................762mW

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

CONDITIONS

V4.2 30.0Input Voltage Range

UNITSMIN TYP MAXPARAMETER

Either SMPS

V+ = 4.2V to 30V, CSH3–CSL3 = 0V,

CSL3 tied to FB3

VREF 5.5

V2.42 2.5 2.58

3V Output Voltage in

Adjustable Mode

Output Voltage Adjust Range

Either SMPS, 5.2V < V+ < 30V %/V0.03

Either SMPS, 0V < CSH_–CSL_ < 80mV

Line Regulation

Dual Mode comparator

%-2

V0.5 1.1Adjustable-Mode Threshold Voltage

Load Regulation

SYNC = VL

From enable to 95% full current limit with respect to

OSC

(Note 1)

270 300 330

Clk512

SKIP = 0V, not tested

Soft-Start Ramp Time

mV10 25 40Idle Mode Threshold

SYNC = 0V

kHz

170 200 230

Oscillator Frequency

V+ = 4.2V to 30V, 0mV < CSH3–CSL3 < 80mV,

FB3 = 0V

V3.20 3.39 3.473V Output Voltage in Fixed Mode

V+ = 4.2V to 30V, CSH5–CSL5 = 0V,

CSL5 tied to FB5

V2.42 2.5 2.58

5V Output Voltage in

Adjustable Mode

V+ = 5.2V to 30V, 0mV < CSH–CSL5 < 80mV,

FB5 = 0V

V4.85 5.13 5.255V Output Voltage in Fixed Mode

SYNC = VL 97 98

SYNC = 0V (Note 2)

98 99

Maximum Duty Factor

CSH3–CSL3 or CSH5–CSL5 80 100 120

SKIP = VL or V

< 13V or SECFB < 2.44V

-50 -100 -150

Current-Limit Threshold

MAIN SMPS CONTROLLERS

MAX1630–MAX1635

Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, T

= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

= +25°C.)

V+ = VL = 0V,

CSL3 = CSH3 = CSL5 = CSH5 = 5.5V

µA0.01 10

Not tested

Current-Sense Input Leakage Current

Not tested

Rising edge, hysteresis = 1% (Note 3)

< 13V or SECFB < 2.44V

V18 20

µs1

Falling edge (MAX1631/MAX1634)

DL Pulse Width

Falling edge (Note 3)

Shunt Threshold

V2.44 2.60

V13 14

CONDITIONS

Regulation Threshold

SECFB Regulation Threshold

= 20V (Note 3)

= 5V, off mode (Notes 3, 4) µA30V

Leakage Current

mA10V

Shunt Sink Current

ns200

ns200SYNC Input High Pulse Width

SYNC Input Low Pulse Width

13V < V

< 18V, 0mA < I

LOAD

< 120mA V11.65 12.1 12.5012OUT Output Voltage

UNITSMIN TYP MAXPARAMETER

Not tested ns200SYNC Rise/Fall Time

kHz240 350SYNC Input Frequency Range

= 18V, run mode, no 12OUT load

12OUT forced to 11V, V

= 13V

µA50 100

mA15012OUT Current Limit

Quiescent V

Current

Rising edge of CSL5, hysteresis = 1%

Falling edge, hysteresis = 1%

V4.2 4.5 4.7

V3.5 3.6 3.7

VL Undervoltage Lockout

Fault Threshold

VL Switchover Threshold

SHDN = V+, RUN/ON3 = TIME/ON5 = 0V,

5.3V < V+ < 30V, 0mA < I

LOAD

< 50mA

V4.7 5.1VL Output Voltage

Falling edge V1.8 2.4

µA10REF Sink Current

REF Fault Lockout Voltage

V+ = 4V to 24V, SHDN = 0V

V+ = 4.2V to 5.5V, both SMPSs off,

includes current into SHDN

µA410

µA50 200

V+ Standby Supply Current

in Dropout

V+ Shutdown Supply Current

V+ = 5.5V to 30V, both SMPSs off,

includes current into SHDN

VL switched over to CSL5, 5V SMPS on

µA30 60

µA550V+ Operating Supply Current

V+ Standby Supply Current

0µA < I

LOAD

< 50µA

No external load (Note 5)

12.5

V2.45 2.5 2.55REF Output Voltage

2.5 4

Both SMPSs enabled, FB3 = FB5 = 0V,

CSL3 = CSH3 = 3.5V,

CSL5 = CSH5 = 5.3V

1.5 4

Quiescent Power Consumption

(Note 3)

MAX1631/

MAX1634

0mA < I

LOAD

< 5mA

100.0

REF Load Regulation

FLYBACK CONTROLLER

12V LINEAR REGULATOR (Note 3)

INTERNAL REGULATOR AND REFERENCE

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P29

MAX1631EAI+

Mfr. #:

Buy MAX1631EAI+

Manufacturer:

Maxim Integrated

Description:

Switching Controllers Multi-Out Low-Noise Power-Supply Ctlr

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

MAX1631EAI+

MAX1631EAI+

Products related to this Datasheet