(PDF) MAX764 Datasheet PDF | Maxim





MAX764 Datasheet PDF

Part Number MAX764
Description -5V/-12V/-15V or Adjustable / High-Efficiency / Low IQ DC-DC Inverters
Manufacture Maxim
Total Page 12 Pages
PDF Download Download MAX764 Datasheet PDF

Features: Datasheet pdf 19-0176; Rev 0; 6/94 K tion lua able a v E il Ava it -5V/-12V/-15V or Adjust able, High-Efficiency, Low IQ DC-DC Inv erters ____________________________Feat ures o High Efficiency for a Wide Range of Load Currents o 250mA Output Curren t o 120µA Max Supply Current o 5µA Ma x Shutdown Current o 3V to 16V Input Vo ltage Range o -5V (MAX764), -12V (MAX76 5), -15V (MAX766), or Adjustable Output from -1V to -16V o Current-Limited PFM Control Scheme o 300kHz Switching Freq uency o Internal, P-Channel Power MOSFE T _______________General Description T he MAX764/MAX765/MAX766 inverting switc hing regulators are highly efficient ov er a wide range of load currents, deliv ering up to 1.5W. A unique, current-lim ited, pulse-frequency-modulated (PFM) c ontrol scheme combines the benefits of traditional PFM converters with the ben efits of pulse-width-modulated (PWM) co nverters. Like PWM converters, the MAX7 64/MAX765/MAX766 are highly efficient a t heavy loads. Yet because they are PFM devices, they use less th.

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MAX764 datasheet
19-0176; Rev 0; 6/94
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_______________General Description
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 ModeTM). The maxi-
mum operating VIN - VOUT differential is 20V.
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
LCD-Bias Generators
Portable Instruments
LAN Adapters
Remote Data-Acquisition Systems
Battery-Powered Applications
__________Typical Operating Circuit
INPUT
3V TO 15V
V+
LX
OUTPUT
-5V
ON/OFF
MAX764
SHDN
47µH
REF
FB
OUT
GND
____________________________Features
o High Efficiency for a Wide Range of Load Currents
o 250mA Output Current
o 120µA Max Supply Current
o 5µA Max Shutdown Current
o 3V to 16V Input Voltage Range
o -5V (MAX764), -12V (MAX765), -15V (MAX766),
or Adjustable Output from -1V to -16V
o Current-Limited PFM Control Scheme
o 300kHz Switching Frequency
o Internal, P-Channel Power MOSFET
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX764CPA
0°C to +70°C
8 Plastic DIP
MAX764CSA
0°C to +70°C
8 SO
MAX764C/D
0°C to +70°C
Dice*
MAX764EPA
-40°C to +85°C
8 Plastic DIP
MAX764ESA
-40°C to +85°C
8 SO
MAX764MJA
-55°C to +125°C 8 CERDIP**
MAX765CPA
0°C to +70°C
8 Plastic DIP
MAX765CSA
0°C to +70°C
8 SO
MAX765C/D
0°C to +70°C
Dice*
MAX765EPA
-40°C to +85°C
8 Plastic DIP
MAX765ESA
-40°C to +85°C
8 SO
MAX765MJA
-55°C to +125°C 8 CERDIP**
Ordering Information continued on last page.
* Dice are tested at TA = +25°C, DC parameters only.
**Contact factory for availability and processing to MIL-STD-883.
__________________Pin Configuration
TOP VIEW
OUT 1
FB 2
SHDN 3
REF 4
MAX764
MAX765
MAX766
DIP/SO
8 LX
7 V+
6 V+
5 GND
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.

MAX764 datasheet
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low IQ DC-DC Inverters
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, FB to GND ...............................-0.3V to (V+ + 0.3V)
LX to V+..................................................................+0.3V to -21V
LX Peak Current ...................................................................1.5A
Continuous Power Dissipation (TA = +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
Maximum 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
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.
ELECTRICAL CHARACTERISTICS
(V+ = 5V, ILOAD = 0mA, CREF = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
V+ Input Voltage Range
Supply Current
Shutdown Current
FB Trip Point
FB Input Current
Output Current and Voltage
(Note 1)
Reference Voltage
REF Load Regulation
REF Line Regulation
Load Regulation (Note 2)
Line Regulation (Note 2)
Efficiency (Note 2)
SHDN Leakage Current
SHDN Input Voltage High
SHDN Input Voltage Low
SYMBOL
V+
IS
ISHDN
IFB
IOUT
VREF
VIH
VIL
CONDITIONS
MAX76_C/E
MAX76_M
V+ = 16V, SHDN < 0.4V
V+ = 16V, SHDN > 1.6V
V+ = 10V, SHDN > 1.6V
3V V+ 16V
MAX76_C
MAX76_E
MAX76_M
MAX764, -4.8V VOUT 5.2V
MAX765C/E, -11.52V VOUT 12.48V
MAX765M, -11.52V VOUT 12.48V
MAX766, -14.40V VOUT -15.60V
MAX76_C
MAX76_E
MAX76_M
0µA IREF 100µA
MAX76_C/E
MAX76_M
3V V+ 16V
0mA ILOAD 100mA
4V V+ 6V
10mA ILOAD 100mA, VOUT = -5V
VIN = 5V
VOUT = -15V
V+ = 16V, SHDN = 0V or V+
3V V+ 16V
3V V+ 16V
MIN
3.0
3.5
-10
150
68
50
35
1.4700
1.4625
1.4550
1.6
TYP
90
2
1
260
120
120
105
1.5
1.5
1.5
4
4
40
0.008
0.12
80
82
MAX UNITS
16.0
V
120
µA
5
10 mV
±50
±70 nA
±90
mA
1.5300
1.5375 V
1.5450
10
mV
15
100 µV/V
%/mA
%/V
%
±1 µA
V
0.4 V
2 _______________________________________________________________________________________




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