MAX1653EEE Datasheet MAX1655EEE+, MAX1653EEE+T, MAX1655EEE+T | P1-P3

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General Description

The MAX1652–MAX1655 are high-efficiency, pulse-

width-modulated (PWM), step-down DC-DC controllers

in small QSOP packages. The MAX1653/MAX1655 also

come in 16-pin narrow SO packages that are pin-

compatible upgrades to the popular MAX797. Improve-

ments include higher duty-cycle operation for better

dropout, lower quiescent supply currents for better

light-load efficiency, and an output voltage down to 1V

(MAX1655).

The MAX1652–MAX1655 achieve up to 96% efficiency

and deliver up to 10A using a unique Idle Mode™ syn-

chronous-rectified PWM control scheme. These devices

automatically switch between PWM operation at heavy

loads and pulse-frequency-modulated (PFM) operation

at light loads to optimize efficiency over the entire out-

put current range. The MAX1653/MAX1655 also feature

logic-controlled, forced PWM operation for noise-sensi-

tive applications.

All devices operate with a selectable 150kHz/300kHz

switching frequency, which can also be synchronized

to an external clock signal. Both external power switch-

es are inexpensive N-channel MOSFETs, which provide

low resistance while saving space and reducing cost.

The MAX1652 and MAX1654 have an additional feed-

back pin that permits regulation of a low-cost second

output tapped from a transformer winding. The

MAX1652 provides an additional positive output. The

MAX1654 provides an additional negative output.

The MAX1652–MAX1655 have a 4.5V to 30V input volt-

age range. The MAX1652/MAX1653/MAX1654’s output

range is 2.5V to 5.5V while the MAX1655’s output range

extends down to 1V. An evaluation kit (MAX1653EVKIT)

is available to speed designs.

Applications

Notebook Computers

PDAs

Cellular Phones

Hand-Held Computers

Handy-Terminals

Mobile Communicators

Distributed Power

____________________________Features

♦ 96% Efficiency

♦ Small, 16-Pin QSOP Package

(half the size of a 16-pin narrow SO)

♦ Pin-Compatible with MAX797 (MAX1653/MAX1655)

♦ Output Voltage Down to 1V (MAX1655)

♦ 4.5V to 30V Input Range

♦ 99% Duty Cycle for Lower Dropout

♦ 170µA Quiescent Supply Current

♦ 3µA Logic-Controlled Shutdown

♦ Dual, N-Channel, Synchronous-Rectified Control

♦ Fixed 150kHz/300kHz PWM Switching,

or Synchronized from 190kHz to 340kHz

♦ Programmable Soft Start

♦ Low-Cost Secondary Outputs (MAX1652/MAX1654)

MAX1652–MAX1655

High-Efficiency, PWM, Step-Down

DC-DC Controllers in 16-Pin QSOP

________________________________________________________________

Maxim Integrated Products

19-1357; Rev 1; 7/98

EVALUATION KIT

AVAILABLE

Ordering Information

Selection Guide

Pin Configurations appear at end of data sheet.

Idle Mode is a trademark of Maxim Integrated Products.

PART

FEEDBACK

VOLTAGE (V)

SPECIAL

FEATURE

COMPATIBILITY

MAX1652 2.5

Regulates positive

secondary voltage

(such as +12V)

Same pin order

as MAX796, but

smaller package

MAX1653 2.5

Logic-controlled,

low-noise mode

Pin-compatible

with MAX797

MAX1654 2.5

Regulates negative

secondary voltage

(such as -5V)

Same pin order

as MAX799, but

smaller package

MAX1655 1

Low output volt-

ages (1V to 5.5V);

logic-controlled,

low-noise mode

Pin compatible

with MAX797

(except for feed-

back voltage)

PART

MAX1652EEE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

MAX1653EEE -40°C to +85°C 16 QSOP

MAX1654EEE

-40°C to +85°C 16 QSOP

MAX1653ESE

-40°C to +85°C 16 Narrow SO

MAX1655ESE

-40°C to +85°C 16 Narrow SO

MAX1655EEE -40°C to +85°C 16 QSOP

MAX1652–MAX1655

High-Efficiency, PWM, Step-Down

DC-DC Controllers in 16-Pin QSOP

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +15V, GND = PGND = 0V, SYNC = REF, I

= I

REF

= 0A, T

= 0°C to +85°C, unless otherwise noted.)

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

GND to PGND .......................................................-0.3V to +0.3V

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

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

DH to LX.....................................................-0.3V to (BST + 0.3V)

LX to BST..................................................................-6V to +0.3V

SHDN to GND...............................................-0.3V to (V+ + 0.3V)

SYNC, SS, REF, SECFB, SKIP, FB to GND...-0.3V to (VL + 0.3V)

DL to PGND..................................................-0.3V to (VL + 0.3V)

CSH, CSL to GND ....................................................-0.3V to +6V

VL Short Circuit to GND..............................................Momentary

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

VL Output Current...............................................+50mA to -1mA

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

Continuous Power Dissipation (T

= +70°C)

SO (derate 8.70mW/°C above +70°C) .......................696mW

QSOP (derate 8.3mW/°C above +70°C) ....................667mW

Operating Temperature Range

MAX165_E_E ..................................................-40°C to +85°C

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

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

Rising edge, falling edge hysteresis = 60mV

Rising edge, falling edge hysteresis = 50mV

SHDN = 2V, 0 < I

< 25mA, 5.5V < V+ < 30V

Rising edge, falling edge, hysteresis = 22mV (MAX1654)

CSH - CSL, negative

CSH - CSL, positive

Falling edge, rising edge, hysteresis = 22mV (MAX1652)

6V < V+ < 30V

25mV < (CSH - CSL) < 80mV

0 < (CSH - CSL) < 80mV, FB = VL, 6V < V+ < 30V,

includes line and load regulation

External resistor divider

= 4V

0 < (CSH - CSL) < 80mV

= 0V

CONDITIONS

V4.2 4.5 4.7VL/CSL Switchover Voltage

V3.8 3.9 4.0VL Fault Lockout Voltage

V4.7 5.0 5.3VL Output Voltage

-0.05 0 0.05

2.45 2.50 2.55

SECFB Regulation Setpoint

mA2.0SS Fault Sink Current

µA2.5 4.0 6.5SS Source Current

V4.5 30Input Supply Range

-50 -100 -160

80 100 120

Current-Limit Voltage

%/V0.03 0.06Line Regulation

1.2

V4.85 5.06 5.255V Output Voltage (CSL)

1 5.5

Nominal Adjustable Output

Voltage Range

Load Regulation

UNITSMIN TYP MAXPARAMETER

0 < (CSH - CSL) < 80mV, FB = 0V, 4.5V < V+ < 30V,

includes line and load regulation

V3.20 3.34 3.463.3V Output Voltage (CSL)

2.5 5.5

MAX1655

MAX1652/MAX1653/

MAX1654

2.43 2.50 2.57

MAX1652/MAX1653/

MAX1654

CSH - CSL = 0V, CSL = FB,

SKIP = 0V, 4.5V < V+ < 30V

MAX1655

0.97 1.00 1.03

Feedback Voltage

3.3V AND 5V STEP-DOWN CONTROLLERS

FLYBACK/PWM CONTROLLER

INTERNAL REGULATOR AND REFERENCE

MAX1652–MAX1655

High-Efficiency, PWM, Step-Down

DC-DC Controllers in 16-Pin QSOP

_______________________________________________________________________________________ 3

Note 1: Since the reference uses VL as its supply, V+ line-regulation error is insignificant.

Note 2: At very low input voltages, quiescent supply current may increase due to excessive PNP base current in the VL linear

regulator. This occurs if V+ falls below the preset VL regulation point (5V nominal).

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +15V, GND = PGND = 0V, SYNC = REF, I

= I

REF

= 0A, T

= 0°C to +85°C, unless otherwise noted.)

SECFB, 0 or 4V

SHDN, 0 or 30V

SHDN, SKIP

SYNC

SYNC = 0 or 5V

SYNC = REF

Guaranteed by design, not tested

CSH = CSL = 5.5V

V+ = 4.5V, CSH = CSL = 4.0V (Note 2)

SYNC = 0 or 5V

Falling edge

0 < I

REF

< 100µA

SYNC = REF

SHDN = 0V, CSL = 5.5V, CSH = 5.5V, V+ = 0 or 30V,

VL = 0V

CONDITIONS

0.1

µA

3.0

No external load (Note 1)

Input Current

2.0

VL - 0.5

Input High Voltage

98 99

97 98

Dropout-Mode Maximum Duty

Cycle

kHz190 340Oscillator Sync Range

ns200SYNC Rise/Fall Time

ns200SYNC Low Pulse Width

ns200SYNC High Pulse Width

125 150 175

kHz

270 300 330

Oscillator Frequency

2.46 2.50 2.54

1 2Quiescent Power Consumption

1 8Dropout Power Consumption

5 15

V+ Shutdown Current

V2.0 2.4Reference Fault Lockout Voltage

mV15Reference Load Regulation

µA0.1 1

CSL, CSH Shutdown Leakage

Current

UNITSMIN TYP MAXPARAMETER

SHDN = 0V, V+ = 30V, CSL = 0 or 5.5V

FB = CSH = CSL = 5.5V, VL switched over to CSLV+ Off-State Leakage Current

DL forced to 2V

FB, FB = REF

CSH, CSL, CSH = CSL ≤ 4V

SYNC, SKIP

A1DL Sink/Source Current

±0.1

1.0

SHDN, SKIP

SYNC

0.5

0.8

Input Low Voltage

DH forced to 2V, BST - LX = 4.5V A1DH Sink/Source Current

High or low, BST - LX = 4.5V

High or low

Ω1.5 5DH On-Resistance

Ω1.5 5DL On-Resistance

Reference Output Voltage V

OSCILLATOR AND INPUTS/OUTPUTS

3 7

5 15

µA

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

MAX1653EEE

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