MAX608 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller

19-0438; Rev 0; 9/95
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5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
_______________General Description
The MAX608 low-voltage step-up controller operates
from a 1.8V to 16.5V input voltage range. Pulse-fre-
quency-modulation (PFM) control provides high effi-
ciency at heavy loads, while using only 85µA (typical)
when operating with no load. In addition, a logic-con-
trolled shutdown mode reduces supply current to 2µA
typical. The output voltage is factory-set at 5V or can be
adjusted from 3V to 16.5V with an external resistor
divider.
The MAX608 is ideal for two- and three-cell battery-
powered systems. An operating frequency of up to
300kHz allows use with small surface-mount compo-
nents.
The MAX608 operates in “bootstrapped” mode only
(with the chip supply, OUT, connected to the DC-DC
output). For a 12V output without external resistors, or
for nonbootstrapped applications (chip supply connect-
ed to input voltage), refer to the pin-compatible
MAX1771. The MAX608 is available in 8-pin DIP and
SO packages.
____________________________Features
o 1.8V to 16.5V Input Range
o 85% Efficiency for 30mA to 1.5A Load Currents
o Up to 10W Output Power
o 110µA Max Supply Current
o 5µA Max Shutdown Current
o Preset 5V or Adjustable Output (3V to 16.5V)
o Current-Limited PFM Control Scheme
o Up to 300kHz Switching Frequency
o Evaluation Kit Available
________________________Applications
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
______________Ordering Information
PART
TEMP. RANGE
MAX608C/D
0°C to +70°C
MAX608EPA
-40°C to +85°C
MAX608ESA
-40°C to +85°C
* Contact factory for dice specifications.
PIN-PACKAGE
Dice*
8 Plastic DIP
8 SO
__________Typical Operating Circuit __________________Pin Configuration
INPUT
1.8V TO VOUT
MAX608
ON/OFF
SHDN
EXT
N
REF
CS
FB AGND GND OUT
OUTPUT
5V
TOP VIEW
EXT 1
OUT 2
FB 3
SHDN 4
MAX608
DIP/SO
8 CS
7 GND
6 AGND
5 REF
________________________________________________________________ Maxim Integrated Products 1
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