MAX618 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 28V, PWM, Step-Up DC-DC Converter

19-1462; Rev 0; 6/99
28V, ^{EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL} PWM, Step-Up DC-DC Converter
General Description
The MAX618 CMOS, PWM, step-up DC-DC converter
generates output voltages up to 28V and accepts
inputs from +3V to +28V. An internal 2A, 0.3Ω switch
eliminates the need for external power MOSFETs while
supplying output currents up to 500mA or more. A
PWM control scheme combined with Idle Mode™ oper-
ation at light loads minimizes noise and ripple while
maximizing efficiency over a wide load range. No-load
operating current is 500µA, which allows efficiency up
to 93%.
A fast 250kHz switching frequency allows the use of
small surface-mount inductors and capacitors. A shut-
down mode extends battery life when the device is not
in use. Adaptive slope compensation allows the
MAX618 to accommodate a wide range of input and
output voltages with a simple, single compensation
capacitor.
The MAX618 is available in a thermally enhanced 16-
pin QSOP package that is the same size as an industry-
standard 8-pin SO but dissipates up to 1W. An
evaluation kit (MAX618EVKIT) is available to help
speed designs.
Features
o Adjustable Output Voltage Up to +28V
o Up to 93% Efficiency
o Wide Input Voltage Range (+3V to +28V)
o Up to 500mA Output Current at +12V
o 500µA Quiescent Supply Current
o 3µA Shutdown Current
o 250kHz Switching Frequency
o Small 1W 16-Pin QSOP Package
PART
MAX618EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
Applications
Automotive-Powered DC-DC Converters
Industrial +24V and +28V Systems
LCD Displays
Palmtop Computers
Typical Operating Circuit
Pin Configuration
TOP VIEW
GND 1
LX 2
LX 3
LX 4
SHDN 5
COMP 6
FB 7
GND 8
MAX618
16 GND
15 PGND
14 PGND
13 PGND
12 GND
11 VL
10 IN
9 GND
V_IN
3V TO 28V
IN
LX
MAX618
SHDN
PGND
VL
FB
COMP
GND
V_OUT
UP TO 28V
QSOP
Idle Mode is a trademark of Maxim Integrated Products.
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