19-0201; Rev 0; 11/93
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 , Ste p-Up DC-DC Conve rte rs
Q
1/MAX762
_______________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
♦ 12V/150mA Flash Memory Programming Supply
♦ 110µA Max Supply Current
The MAX761/MAX762 s te p -up s witc hing re g ula tors
provide high efficiency over a wide range of load currents,
d e live ring up to 150mA. A uniq ue , c urre nt-limite d
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.
♦ 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
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.
♦ Internal, 1A, N-Channel Power FET
♦ LBI/LBO Low-Battery Comparator
______________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
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.
MAX761CPA
MAX761CSA
MAX761C/D
MAX761EPA
MAX761ESA
MAX761MJA
MAX762CPA
MAX762CSA
MAX762C/D
MAX762EPA
MAX762ESA
MAX762MJA
0°C to +70°C
0°C to +70°C
Dice*
-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
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.
8 CERDIP**
8 Plastic DIP
8 SO
0°C to +70°C
0°C to +70°C
Dice*
_________________________Applic a t io n s
Flash Memory Programming
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
PCMCIA Cards
8 CERDIP**
Battery-Powered Applications
High-Efficiency DC-DC Converters
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
__________Typ ic a l Op e ra t in g Circ u it
__________________P in Co n fig u ra t io n
INPUT
4.75V
TO 12V
TOP VIEW
33µF
18µH
OUTPUT
12V
150mA
LX
LBO
LBI
1
2
3
4
V+
8
7
6
5
33µF
MAX761
LX
SHDN
V+
ON/OFF
MAX761
MAX762
FB
GND
REF
LBI
LOW-BATTERY
DETECTOR OUTPUT
SHDN
LOW-BATTERY
LBO
DETECTOR INPUT
REF
FB
GND
DIP/SO
________________________________________________________________ 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 .