MAX1771ESAT

Manufacturer Part NumberMAX1771ESAT
DescriptionSOP8
ManufacturerMaxim Integrated Products
MAX1771ESAT datasheet
 


Specifications of MAX1771ESAT

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19-0263; Rev 2; 3/02
12V or Adjustable, High-Efficiency,
General Description
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.
Positive LCD-Bias Generators
Flash Memory Programmers
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
Typical Operating Circuit
INPUT
2V TO V
OUT
EXT
MAX1771
ON/OFF
SHDN
CS
REF
V+
FB AGND GND
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low I
, Step-Up DC-DC Controller
Q
o 90% Efficiency for 30mA to 2A Load Currents
o Up to 24W Output Power
o 110µA (max) Supply Current
o 5µA (max) Shutdown Current
o 2V to 16.5V Input Range
o Preset 12V or Adjustable Output Voltage
o Current-Limited PFM Control Scheme
o Up to 300kHz Switching Frequency
o Evaluation Kit Available
PART
MAX1771CPA
MAX1771CSA
MAX1771C/D
MAX1771EPA
MAX1771ESA
Applications
MAX1771MJA
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
TOP VIEW
OUTPUT
12V
N
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
0°C to +70°C
8 Plastic DIP
0°C to +70°C
8 SO
0°C to +70°C
Dice*
-40°C to +85°C
8 Plastic DIP
-40°C to +85°C
8 SO
-55°C to +125°C
8 CERDIP**
Pin Configuration
1
8
EXT
CS
2
7
V+
GND
MAX1771
3
6
AGND
FB
4
5
REF
SHDN
DIP/SO
1