MAX765ESA+ Maxim Integrated Products, MAX765ESA+ Datasheet

IC DC/DC INV -12V HI-EFF 8-SOIC

MAX765ESA+

Manufacturer Part Number
MAX765ESA+
Description
IC DC/DC INV -12V HI-EFF 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Invertingr
Datasheet

Specifications of MAX765ESA+

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
-12V, -1 ~ -16 V
Current - Output
120mA
Frequency - Switching
300kHz
Voltage - Input
3 ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
471mW
Output Voltage
- 12 V
Output Current
0.12 A
Input Voltage
3 V to 16.5 V
Switching Frequency
300 KHz
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX764/MAX765/MAX766 inverting switching regu-
lators are highly efficient over a wide range of load cur-
rents, delivering up to 1.5W. A unique, current-limited,
pulse-frequency-modulated (PFM) control scheme com-
bines the benefits of traditional PFM converters with the
benefits of pulse-width-modulated (PWM) converters.
Like PWM converters, the MAX764/MAX765/MAX766 are
highly efficient at heavy loads. Yet because they are PFM
devices, they use less than 120µA of supply current (vs.
2mA to 10mA for a PWM device).
The input voltage range is 3V to 16V. The output volt-
age is preset at -5V (MAX764), -12V (MAX765), or -15V
(MAX766); it can also be adjusted from -1V to -16V
using two external resistors (Dual Mode
mum operating V
These devices use miniature external components; their
high switching frequencies (up to 300kHz) allow for less
than 5mm diameter surface-mount magnetics. A stan-
dard 47µH inductor is ideal for most applications, so no
magnetics design is necessary.
An internal power MOSFET makes the MAX764/MAX765/
MAX766 ideal for minimum component count, low- and
medium-power applications. For increased output drive
capability or higher output voltages, use the
MAX774/MAX775/MAX776 or MAX1774, which drive an
external power P-channel MOSFET for loads up to 5W.
________________________Applications
19-0176; Rev 0; 6/94
Call toll free 1-800-998-8800 for free samples or literature.
__________Typical Operating Circuit
_______________General Description
3V TO 15V
INPUT
ON/OFF
LCD-Bias Generators
Portable Instruments
LAN Adapters
Remote Data-Acquisition Systems
Battery-Powered Applications
IN
SHDN
REF
________________________________________________________________ Maxim Integrated Products
- V
High-Efficiency, Low I
FB
OUT
MAX764
V+
GND
differential is 20V.
OUT
LX
47µH
TM
). The maxi-
OUTPUT
-5V/-12V/-15V or Adjustable,
-5V
____________________________Features
Ordering Information continued on last page.
* Dice are tested at T
**Contact factory for availability and processing to MIL-STD-883.
__________________Pin Configuration
______________Ordering Information
MAX764CPA
MAX764CSA
MAX764C/D
MAX764EPA
MAX764ESA
MAX764MJA
MAX765CPA
MAX765CSA
MAX765C/D
MAX765EPA
MAX765ESA
MAX765MJA
High Efficiency for a Wide Range of Load Currents
250mA Output Current
120µA Max Supply Current
5µA Max Shutdown Current
3V to 16V Input Voltage Range
-5V (MAX764), -12V (MAX765), -15V (MAX766),
or Adjustable Output from -1V to -16V
Current-Limited PFM Control Scheme
300kHz Switching Frequency
Internal, P-Channel Power MOSFET
TOP VIEW
PART
Q
SHDN
DC-DC Inverters
OUT
REF
FB
A
-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
TEMP. RANGE
= +25°C, DC parameters only.
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
1
2
3
4
MAX764
MAX765
MAX766
DIP/SO
PIN-PACKAGE
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**
LX
V+
V+
GND
1

Related parts for MAX765ESA+

MAX765ESA+ Summary of contents

Page 1

... LX MAX764 SHDN ON/OFF OUT REF FB GND ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. -5V/-12V/-15V or Adjustable, Q ____________________________Features High Efficiency for a Wide Range of Load Currents 250mA Output Current 120µA Max Supply Current 5µA Max Shutdown Current ...

Page 2

Adjustable, High-Efficiency, Low I ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +17V OUT to GND ...........................................................+0.5V to -17V Maximum Differential (V+ to OUT) ......................................+21V REF, SHDN GND ...............................-0.3V to (V+ + 0.3V V+..................................................................+0.3V ...

Page 3

High-Efficiency, Low I ELECTRICAL CHARACTERISTICS (continued) ( 0mA 0.1µ LOAD REF A PARAMETER SYMBOL LX Leakage Current LX On-Resistance Peak Current PEAK Maximum Switch On-Time t ON Minimum ...

Page 4

Adjustable, High-Efficiency, Low I ____________________________Typical Operating Characteristics (continued) ( -5V +25°C, unless otherwise noted.) OUT A MAXIMUM OUTPUT CURRENT vs. SUPPLY VOLTAGE 600 CIRCUIT OF FIGURE 2 500 V = -5V OUT ...

Page 5

High-Efficiency, Low I ____________________________Typical Operating Characteristics (continued) ( -5V +25°C, unless otherwise noted.) OUT A LX ON-RESISTANCE vs. TEMPERATURE 2.2 2 (V+) = 10V OUT 1.8 1 ...

Page 6

Adjustable, High-Efficiency, Low I ____________________________Typical Operating Characteristics (continued) ( -5V +25°C, unless otherwise noted.) OUT A TIME TO ENTER/EXIT SHUTDOWN 0V 0V 2ms/div CIRCUIT OF FIGURE 5V ...

Page 7

High-Efficiency, Low I ____________________________Typical Operating Characteristics (continued) ( -5V +25°C, unless otherwise noted.) OUT A DISCONTINUOUS CONDUCTION AT HALF CURRENT LIMIT s/div CIRCUIT OF FIGURE 5V ...

Page 8

Adjustable, High-Efficiency, Low I REF SHDN ERROR COMPARATOR Q ONE-SHOT TRIG Q ONE-SHOT Figure 1. Block Diagram _______________Detailed Description Operating Principle The MAX764/MAX765/MAX766 are BiCMOS, inverting, switch-mode power supplies that provide fixed outputs of -5V, -12V, and -15V, ...

Page 9

High-Efficiency, Low I switch is OFF), the range of input and output voltages is limited to a 21V absolute maximum differential voltage. When output voltages more negative than -16V are required, substitute the MAX764/MAX765/MAX766 with Maxim’s MAX774/MAX775/MAX776 or MAX1774, which ...

Page 10

Adjustable, High-Efficiency, Low I Modes of Operation When delivering high output currents, the MAX764/ MAX765/MAX766 operate in continuous-conduction mode. In this mode, current always flows in the induc- tor, and the control circuit adjusts the duty-cycle of the ...

Page 11

High-Efficiency, Low I Reference Capacitor Bypass REF with a 0.1µF capacitor (C3). The REF out- put can source up to 100µA for external loads. Layout Considerations Proper PC board layout is essential to reduce noise generated by high current levels ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1994 Maxim Integrated Products ...

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