19-0176; Rev 0; 6/94
-5 V/-1 2 V/-1 5 V o r Ad ju s t a b le ,
Hig h -Effic ie n c y, Lo w I DC-DC In ve rt e rs
Q
45/MAX76
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ High Efficiency for a Wide Range of Load Currents
♦ 250mA Output Current
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).
♦ 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
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-
♦ Current-Limited PFM Control Scheme
♦ 300kHz Switching Frequency
♦ Internal, P-Channel Power MOSFET
mum operating V - V
differential is 20V.
IN
OUT
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.
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX764CPA
MAX764CSA
MAX764C/D
MAX764EPA
MAX764ESA
MAX764MJA
MAX765CPA
MAX765CSA
MAX765C/D
MAX765EPA
MAX765ESA
MAX765MJA
0°C to +70°C
0°C to +70°C
Dice*
An internal power MOSFET makes the MAX764/MAX765/
MAX766 ideal for minimum component count, low- and
medium-power applications. For increased output drive
c a p a b ility or hig he r outp ut volta g e s , us e the
MAX774/MAX775/MAX776 or MAX1774, which drive an
external power P-channel MOSFET for loads up to 5W.
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
8 Plastic DIP
8 SO
8 CERDIP**
8 Plastic DIP
8 SO
0°C to +70°C
________________________Ap p lic a t io n s
LCD-Bias Generators
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
Portable Instruments
LAN Adapters
8 CERDIP**
Remote Data-Acquisition Systems
Battery-Powered Applications
Ordering Information continued on last page.
* Dice are tested at T = +25°C, DC parameters only.
A
**Contact factory for availability and processing to MIL-STD-883.
__________________P in Co n fig u ra t io n
__________Typ ic a l Op e ra t in g Circ u it
INPUT
3V TO 15V
TOP VIEW
V+
OUTPUT
-5V
LX
OUT
FB
LX
1
2
3
4
8
7
6
5
MAX764
47µH
V+
MAX764
MAX765
MAX766
SHDN
ON/OFF
SHDN
REF
V+
GND
OUT
REF
FB
DIP/SO
GND
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
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