19-0253; Rev 1; 8/94
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+12V, 30mA Flash Memory
Programming Supply
________________________Applications
____________________________Features
o Regulated +12V ±5% Output Voltage
o 4.5V to 5.5V Supply Voltage Range
o Fits in 0.1in2
o Guaranteed 30mA Output
o No Inductor—Uses Only 4 Capacitors
o 185µA Quiescent Current
o Logic-Controlled 0.5µA Shutdown
o 8-Pin Narrow SO and DIP Packages
______________Ordering Information
PART
TEMP. RANGE
MAX662ACPA
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
MAX662ACSA
MAX662AC/D
MAX662AEPA
MAX662AESA
MAX662AMJA
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
* Dice are tested at TA = +25°C.
** Contact factory for availability and processing to MIL-STD-883.
+12V Flash Memory Programming Supplies
Compact +12V Op-Amp Supplies
Switching MOSFETs in Low-Voltage Systems
Dual-Output +12V and +20V Supplies
__________Typical Operating Circuit
INPUT
4.75V TO 5.5V
TOP VIEW
4.7µF
OUTPUT
12V ±5%
30mA
VCC
SHDN
Vpp
VOUT
FLASH
MEMORY
MAX662A
0.22µF
C1+
C1-
__________________Pin Configuration
C2-
GND
0.22µF
4.7µF
C1- 1
8
SHDN
C1+ 2
7
GND
6
VOUT
5
VCC
C2- 3
MAX662A
C2+ 4
C2+
DIP/SO
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
MAX662A
_______________General Description
The MAX662A is a regulated +12V, 30mA-output, chargepump 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 output from inputs as low as 4.75V. It fits into less than 0.1in2
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 shutdown 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 completely 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 current, 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.
