MAX1771 Maxim, MAX1771 Datasheet
MAX1771
Manufacturer Part Number
MAX1771
Description
12V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controller
Manufacturer
Maxim
Datasheet
1.MAX1771.pdf
(16 pages)
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DataSheet4U.com
www.DataSheet4U.com
DataSheet
4
U
.com
The MAX1771 step-up switching controller provides
90% efficiency over a 30mA to 2A load. A unique cur-
rent-limited pulse-frequency-modulation (PFM) control
scheme gives this device the benefits of pulse-width-
modulation (PWM) converters (high efficiency at heavy
loads), while using less than 110µA of supply current (vs.
2mA to 10mA for PWM converters).
This controller uses miniature external components. Its
high switching frequency (up to 300kHz) allows sur-
face-mount magnetics of 5mm height and 9mm diame-
ter. It accepts input voltages from 2V to 16.5V. The
output voltage is preset at 12V, or can be adjusted
using two resistors.
The MAX1771 optimizes efficiency at low input voltages
and reduces noise by using a single 100mV current-limit
threshold under all load conditions. A family of similar
devices, the MAX770–MAX773, trades some full-load
efficiency for greater current-limit accuracy; they provide
a 200mV current limit at full load, and switch to 100mV
for light loads.
The MAX1771 drives an external N-channel MOSFET
switch, allowing it to power loads up to 24W. If less power
is required, use the MAX756/MAX757 or MAX761/MAX762
step-up switching regulators with on-board MOSFETs.
An evaluation kit is available. Order the MAX1771EVKIT-SO.
________________________Applications
19-0263; Rev 1; 7/95
Call toll free 1-800-998-8800 for free samples or literature.
__________Typical Operating Circuit
_______________General Description
2V TO V
INPUT
ON/OFF
Positive LCD-Bias Generators
Flash Memory Programmers
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
OUT
SHDN
REF
________________________________________________________________ Maxim Integrated Products
MAX1771
FB AGND GND
EXT
CS
V+
12V or Adjustable, High-Efficiency,
Low I
N
DataSheet4U.com
OUTPUT
Q
12V
, Step-Up DC-DC Controller
____________________________Features
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
__________________Pin Configuration
______________Ordering Information
MAX1771CPA
MAX1771CSA
MAX1771C/D
MAX1771EPA
MAX1771ESA
MAX1771MJA
90% Efficiency for 30mA to 2A Load Currents
Up to 24W Output Power
110µA Max Supply Current
5µA Max Shutdown Current
2V to 16.5V Input Range
Preset 12V or Adjustable Output Voltage
Current-Limited PFM Control Scheme
Up to 300kHz Switching Frequency
Evaluation Kit Available
TOP VIEW
PART
SHDN
EXT
V+
FB
1
2
3
4
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX1771
DIP/SO
8
7
6
5
CS
GND
AGND
REF
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
PIN-PACKAGE
1
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