_______________General Description
The MAX662A is a regulated +12V, 30mA-output, charge-
pump DC-DC converter. It provides the necessary +12V
±5% output to program byte-wide flash memories, and
requires no inductors to deliver a guaranteed 30mA out-
put from inputs as low as 4.75V. It fits into less than 0.1in
2
of board space. The MAX662A is a pin-compatible
upgrade to the MAX662, and is recommended for new
designs. The MAX662A offers lower quiescent and shut-
down currents, and guarantees the output current over all
temperature ranges.
The MAX662A is the first charge-pump boost converter to
provide a regulated +12V output. It requires only a few
inexpensive capacitors, and the entire circuit is complete-
ly surface-mountable.
A logic-controlled shutdown pin that interfaces directly
with microprocessors reduces the supply current to only
0.5µA. The MAX662A comes in 8-pin narrow SO and DIP
packages.
For higher-current flash memory programming solutions,
refer to the data sheets for the MAX734 (120mA output
current, guaranteed) and MAX732 (200mA output cur-
rent, guaranteed) PWM, switch-mode DC-DC converters.
Or, refer to the MAX761 data sheet for a 150mA, PFM
switch-mode DC-DC converter that operates from inputs
as low as 2V.
________________________Applications
+12V Flash Memory Programming Supplies
Compact +12V Op-Amp Supplies
Switching MOSFETs in Low-Voltage Systems
Dual-Output +12V and +20V Supplies
____________________________Features
♦ Regulated +12V ±5% Output Voltage
♦ 4.5V to 5.5V Supply Voltage Range
♦ Fits in 0.1in
2
♦ Guaranteed 30mA Output
♦ No Inductor—Uses Only 4 Capacitors
♦ 185µA Quiescent Current
♦ Logic-Controlled 0.5µA Shutdown
♦ 8-Pin Narrow SO and DIP Packages
______________Ordering Information
MAX662A
+12V, 30mA Flash Memory
Programming Supply
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
SHDN
GND
V
OUT
V
CC
C2+
C2-
C1+
C1-
MAX662A
DIP/SO
TOP VIEW
__________________Pin Configuration
MAX662A
FLASH
MEMORY
4.7µF
4.7µF
0.22µF 0.22µF
OUTPUT
12V ±5%
30mA
V
CC
SHDN
C1+
C1-
V
OUT
C2-
C2+
GND
INPUT
4.75V TO 5.5V
V
pp
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0253; Rev 1; 8/94
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
PART
MAX662ACPA
MAX662ACSA
MAX662AC/D 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
MAX662AEPA -40°C to +85°C 8 Plastic DIP
MAX662AESA -40°C to +85°C 8 SO
MAX662AMJA -55°C to +125°C 8 CERDIP**
* Dice are tested at T
A
= +25°C.
** Contact factory for availability and processing to MIL-STD-883.
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