MAX761CSA+T Datasheet MAX761ESA+, MAX762ESA+, MAX761CPA+ | P1-P3

_______________General Description

The MAX761/MAX762 step-up switching regulators

provide high efficiency over a wide range of load currents,

delivering up to 150mA. A unique, current-limited

pulse-frequency-modulated (PFM) control scheme gives

the devices the benefits of pulse-width-modulated (PWM)

converters (high efficiency with heavy loads), while using

less than 110µA of supply current (vs. 2mA to 10mA for

PWM converters). The result is high efficiency over a wide

range of loads.

The MAX761/MAX762 input voltage range is 2V to 16.5V.

Output voltages are preset to 12V (MAX761) and 15V

(MAX762), or they can be set with two external resistors.

With a 5V input, the MAX761 guarantees a 12V, 150mA

output. Its high efficiency, low supply current, fast start-up

time, SHDN controlling capability, and small size make the

MAX761 ideal for powering flash memory.

The MAX761/MAX762 have an internal 1A power MOS-

FET, making them ideal for minimum-component, low- and

medium-power applications. These devices use tiny exter-

nal components, and their high switching frequencies (up

to 300kHz) allow for small surface-mount magnetics.

For increased output drive capability or higher output volt-

ages, use the MAX770–MAX773, which are similar in

design to the MAX761/MAX762, but drive external power

MOSFETs. For stepping up to 5V, see the MAX756/

MAX757 and MAX856-MAX859 data sheets.

_________________________Applications

Flash Memory Programming

PCMCIA Cards

Battery-Powered Applications

High-Efficiency DC-DC Converters

____________________________Features

♦ High Efficiency for a Wide Range of Load Currents

♦ 12V/150mA Flash Memory Programming Supply

♦ 110µA Max Supply Current

♦ 5µA Max Shutdown Supply Current

♦ 2V to 16.5V Input Voltage Range

♦ 12V (MAX761), 15V (MAX762) or Adjustable Output

♦ Current-Limited PFM Control Scheme

♦ 300kHz Switching Frequency

♦ Internal, 1A, N-Channel Power FET

♦ LBI/LBO Low-Battery Comparator

______________Ordering Information

MAX761/MAX762

12V/15V or Adjustable, High-Efficiency,

Low I

, Step-Up DC-DC Converters

________________________________________________________________

Maxim Integrated Products

V+

GND

REF

SHDN

LBI

LBO

MAX761

MAX762

DIP/SO

TOP VIEW

__________________Pin Configuration

MAX761

LBI

SHDN

V+

REF

OUTPUT

12V

150mA

LOW-BATTERY

DETECTOR OUTPUT

LOW-BATTERY

DETECTOR INPUT

INPUT

4.75V

TO 12V

ON/OFF

GND

LBO

33µF

18µH

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

19-0201; Rev 0; 11/93

PART TEMP. RANGE PIN-PACKAGE

MAX761CPA

0°C to +70°C 8 Plastic DIP

MAX761CSA 0°C to +70°C 8 SO

MAX761C/D 0°C to +70°C Dice*

MAX761ESA -40°C to +85°C 8 SO

MAX761EPA -40°C to +85°C 8 Plastic DIP

MAX761MJA -55°C to +125°C 8 CERDIP**

MAX762CPA

0°C to +70°C 8 Plastic DIP

MAX762CSA 0°C to +70°C 8 SO

MAX762C/D 0°C to +70°C Dice*

MAX762EPA -40°C to +85°C 8 Plastic DIP

MAX762ESA -40°C to +85°C 8 SO

MAX762MJA -55°C to +125°C 8 CERDIP**

* Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883.

Evaluation Kit

Available

MAX761/MAX762

12V/15V or Adjustable, High-Efficiency,

Low I

, Step-Up DC-DC Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Supply Voltage V+ to GND.......................................-0.3V to 17V

REF, LBO, LBI, SHDN, FB............................-0.3V to (V+ + 0.3V)

LX..............................................................................-0.3V to 17V

LX Peak Current....................................................................1.5A

LBO Current..........................................................................5mA

Continuous Power Dissipation (T

= +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

SO (derate 5.88mW/°C above +70°C).........................471mW

CERDIP (derate 8.00mW/°C above +70°C).................640mW

Operating Temperature Ranges:

MAX76_C_A........................................................0°C to +70°C

MAX76_E_A.....................................................-40°C to +85°C

MAX76_MJA ..................................................-55°C to +125°C

Junction Temperatures:

MAX76_C_A/E_A..........................................................+150°C

MAX76_MJA.................................................................+175°C

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

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

ELECTRICAL CHARACTERISTICS

(V+ = 5V, I

LOAD

= 0mA, C

REF

= 0.1µF, T

= T

MIN

to T

MAX,

typical values are at T

= +25°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.

PARAMETER SYMBOL MIN TYP MAX

88 110

Minimum Start-Up Voltage 1.7 2.0 V

Minimum Operating Voltage 1.7 V

Supply Current

300

µA

Shutdown Current 15µA

11.52 12.0 12.48

2 16.5

3 16.5Supply Voltage V+

3.1 16.5

11.52 12.0 12.48

14.4 15.0 15.6

Output Voltage

(Note 1)

OUT

14.4 15.0 15.6

Peak Current at LX I

PEAK

0.75 1.0 1.25 A

Maximum Switch-On Time t

6810µs

Minimum Switch-Off Time t

OFF

1.0 1.3 1.6 µs

Load Regulation 0.0042 %/mA

Line Regulation 0.08 %/V

Efficiency 86 %

1.4700 1.50 1.5300

1.4625 1.50 1.5375

Reference Voltage V

REF

1.4550 1.50 1.5450

CONDITIONS

Figure 2,

MAX761,

bootstrapped

V+ = 16.5V, normal operation, SHDN = 0V,

non-bootstrapped

Figure 2, bootstrapped

Figure 2, MAX761, V

= 5V, SHDN = 0V,

normal operation

Figure 2,

MAX762,

bootstrapped

V+ = 10.0V, shutdown mode, SHDN = V+

See Figure 4b

Figure 2, 0mA ≤ I

LOAD

≤ 200mA, bootstrapped

Figure 2, bootstrapped

Figure 2, 4V ≤ V

≤ 6V, bootstrapped

Figure 2, bootstrapped, V

OUT

= 12V,

60mA ≤ I

LOAD

≤ 120mA

Figure 3 or 5 with

external resistors.

MAX76_C

MAX76_E

MAX76_M

MAX76_C/E

MAX76_M

UNITS

0mA ≤ I

LOAD

≤ 75mA,

3V ≤ V+ ≤ 12V

0mA ≤ I

LOAD

≤ 150mA,

4.75V ≤ V+ ≤ 12V

0mA ≤ I

LOAD

≤ 50mA,

3V ≤ V+ ≤ 15V

0mA ≤ I

LOAD

≤ 100mA,

4.75V ≤ V+ ≤ 15V

MAX761/MAX762

12V/15V or Adjustable, High-Efficiency,

Low I

, Step-Up DC-DC Converters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V, I

LOAD

= 0mA, C

REF

= 0.1µF, T

= T

MIN

to T

MAX

, typical values are at T

= +25°C, unless otherwise noted.)

Note 1: See

Typical Operating Characteristics

for output current capability versus input voltage. Guarantees based on correlation

to switching on and off times, on-resistance, and peak-current ratings.

PARAMETER

Voltage Trip Point

SYMBOL MIN TYP MAX

1.4550 1.50 1.5450

UNITS

-20 20

LX On Resistance

LX Leakage Current

1.0 2.2

-30 30

µA

-10 10

Ω

-5 5

SHDN Input High Voltage

-40 40FB Leakage Current I

-60 60

1.6 V

SHDN Input Low Voltage V

1.4700 1.50 1.5300

0.4 V

1.4625 1.50 1.5375

SHDN Leakage Current -1 1 µA

Reference Load Regulation

1.4700 1.50 1.5300

1.4625 1.50 1.5375

LBI Threshold Voltage

1.4550 1.50 1.5450

LBI Hysteresis 20 mV

LBI Leakage Current

Reference Line Regulation

-20 20 nA

LBO Leakage Current -1 1 µA

LBO Voltage V

0.4 V

LBI to LBO Delay 2.5 µs

CONDITIONS

MAX76_M

MAX76_C

V+ > 5.0V

V+ = 16.5V,

LX = 17V

MAX76_E

MAX76_M

2.0V ≤ V+ ≤ 16.5V

MAX76_C

MAX76_E

V+ = 16.5V, SHDN = 0V or V+

LBI falling

0µA ≤ I

LOAD

≤ 100µA

V+ = 16.5V, V

LBI

= 1.5V

3.0V ≤ V+ ≤ 16.5V

V+ = 16.5V, V

LBO

= 16.5V

V+ = 5.0V, I

SINK

= 1mA

Overdrive = 5mV

MAX76_C

MAX76_M

MAX76_E

30 100 µV/V

MAX76_C/E

MAX76_M

MAX76_C

MAX76_M

MAX76_E

P1-P3 P4-P6 P7-P9 P10-P12

MAX761CSA+T

Mfr. #:

Buy MAX761CSA+T

Manufacturer:

Maxim Integrated

Description:

IC REG BOOST ADJ/12V 1.5A 8SOIC

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MAX761CSA+T

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