Rainbow Electronics MAX608 - Manual

_______________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.
________________________Applications
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
____________________________Features
♦ 1.8V to 16.5V Input Range
♦ 85% Efficiency for 30mA to 1.5A Load Currents
♦ Up to 10W Output Power
♦ 110µA Max Supply Current
♦ 5µA Max Shutdown Current
♦ Preset 5V or Adjustable Output (3V to 16.5V)
♦ Current-Limited PFM Control Scheme
♦ Up to 300kHz Switching Frequency
♦ Evaluation Kit Available
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
8
7
6
5
CS
GND
AGND
REF SHDN
FB
OUT
EXT
TOP VIEW
MAX608
DIP/SO
__________________Pin Configuration
FB AGND GND OUT
CS
EXT N
REF
SHDN ON/OFF
OUTPUT
5V
INPUT
1.8V TO V OUT
MAX608
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0438; Rev 0; 9/95
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
* Contact factory for dice specifications.
______________Ordering Information
PART
MAX608C/D
MAX608EPA
MAX608ESA
-40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
Dice*
8 Plastic DIP
-40°C to +85°C 8 SO