MAX761C/D MAXIM [Maxim Integrated Products], MAX761C/D Datasheet

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MAX761C/D

Manufacturer Part Number
MAX761C/D
Description
12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Converters
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX761CD.pdf (12 pages)
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.
19-0201; Rev 0; 11/93
_________________________Applications
Call toll free 1-800-998-8800 for free samples or literature.
__________Typical Operating Circuit
_______________General Description
TO 12V
Flash Memory Programming
PCMCIA Cards
Battery-Powered Applications
High-Efficiency DC-DC Converters
INPUT
4.75V
DETECTOR INPUT
LOW-BATTERY
ON/OFF
33µF
________________________________________________________________ Maxim Integrated Products
SHDN
LBI
REF
12V/15V or Adjustable, High-Efficiency,
FB
MAX761
GND
LBO
LX
V+
Low I
18µH
LOW-BATTERY
DETECTOR OUTPUT
OUTPUT
150mA
33µF
Q
12V
, Step-Up DC-DC Converters
____________________________Features
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
__________________Pin Configuration
______________Ordering Information
MAX761CPA
MAX761CSA
MAX761C/D
MAX761EPA
MAX761ESA
MAX761MJA
MAX762CPA
MAX762CSA
MAX762C/D
MAX762EPA
MAX762ESA
MAX762MJA
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
TOP VIEW
PART
SHDN
LBO
LBI
FB
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
1
2
3
4
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX761
MAX762
DIP/SO
8
7
6
5
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
V+
LX
GND
REF
PIN-PACKAGE
1

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MAX761C/D Summary of contents

Page 1

... 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 PART MAX761CPA MAX761CSA MAX761C/D MAX761EPA MAX761ESA MAX761MJA MAX762CPA MAX762CSA MAX762C/D MAX762EPA MAX762ESA MAX762MJA * Contact factory for dice specifications. ...

Page 2

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Converters Q 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 ...

Page 3

Adjustable, High-Efficiency, Low I ELECTRICAL CHARACTERISTICS (continued) ( 0mA 0.1µ LOAD REF A PARAMETER SYMBOL Reference Load Regulation Reference Line Regulation LX Leakage Current FB Leakage Current I FB ...

Page 4

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Converters Q __________________________________________Typical Operating Characteristics (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. OUTPUT CURRENT BOOTSTRAPPED 100 V = 10V ...

Page 5

Adjustable, High-Efficiency, Low I ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted LEAKAGE vs. TEMPERATURE 1000 V+ = 15V 100 16. ...

Page 6

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Converters Q _____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A LOAD–TRANSIENT RESPONSE 5µs/div (0mA to 200mA) LOAD ...

Page 7

Adjustable, High-Efficiency, Low I LBO LBI LBI REF Q ONE-SHOT TRIG ONE-SHOT CURRENT CONTROL CIRCUITRY Figure 1. Simple Block Diagram ________________Detailed Description Operating Principle The MAX761/MAX762 BiCMOS step-up switch-mode power supplies provide fixed outputs of ...

Page 8

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Converters 18µH 1N5817 +5V C1 33µ REF C3 MAX761 0.1µ SHDN LBI LBO ...

Page 9

Adjustable, High-Efficiency, Low I Figure 4a. CCM, Heavy Load Current Waveform (500mA/div) used in a bootstrapped circuit (Figure 5), undervoltage lockout prevents start-up at low input voltages; but once started, operation can continue down to a lower voltage ...

Page 10

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Converters 1N5817 18µ MAX761 REF MAX762 C3 2 LBI SHDN GND C1 = 33µ ...

Page 11

Adjustable, High-Efficiency, Low I Reference Capacitor Bypass REF with a 0.1µF capacitor. REF can source up to 100µA. Setting the Low-Battery Detector Voltage To set the low-battery detector’s falling trip voltage (V ), select R3 between 10kΩ and ...

Page 12

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Converters Q ___________________Chip Topography LBO V+ LBI FB SHDN 0.080" (2.030mm) TRANSISTOR COUNT: 492; SUBSTRATE CONNECTED TO V+. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely ...

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