19-0438; Rev 0; 9/95
UAL
IT MAN
TION K
A
EET
EVALU
ATA SH
OWS D
FOLL
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
____________________________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
_______________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.
MAX608
________________________Applications
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
______________Ordering Information
PART
MAX608C/D
MAX608EPA
MAX608ESA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
Dice*
8 Plastic DIP
8 SO
* Contact factory for dice specifications.
__________Typical Operating Circuit
INPUT
1.8V TO V
OUT
OUTPUT
5V
EXT
CS
N
__________________Pin Configuration
TOP VIEW
ON/OFF
MAX608
SHDN
REF
EXT
OUT
1
2
8
CS
GND
AGND
REF
MAX608
7
6
5
FB
3
SHDN
4
FB AGND GND OUT
DIP/SO
________________________________________________________________
Maxim Integrated Products
1
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