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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1771 Datasheet

Step-Up DC-DC Controller

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AVAILABLE
EVALUATION KIT AVAILABLE
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
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.
Applications
Positive LCD-Bias Generators
Flash Memory Programmers
Functional Diagrams
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
Features
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
Ordering Information
PART
MAX1771CPA
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
MAX1771CSA
MAX1771C/D
MAX1771EPA
MAX1771ESA
MAX1771MJA
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
Pin Configuration
Typical Operating Circuit
INPUT
2V TO VOUT
ON/OFF
MAX1771 EXT
SHDN
CS
N
OUTPUT
12V
REF
V+
Pin Configurations apFpBeAaGrNDatGNeDnd of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
TOP VIEW
EXT 1
V+ 2
FB 3
SHDN 4
MAX1771
DIP/SO
8 CS
7 GND
6 AGND
5 REF
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0263; Rev 2; 3/02


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1771 Datasheet

Step-Up DC-DC Controller

No Preview Available !

MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V+ to GND ...............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND ...................-0.3V, (V+ + 0.3V)
GND to AGND.............................................................0.1V, -0.1V
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW
Operating Temperature Ranges
MAX1771C_ A .....................................................0°C to +70°C
MAX1771E_ A ..................................................-40°C to +85°C
MAX1771MJA ................................................-55°C to +125°C
Junction Temperatures
MAX1771C_ A/E_ A.......................................................+150°C
MAX1771MJA ..............................................................+175°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MAX1771 (internal feedback resistors)
MIN
2.0
Input Voltage Range
MAX1771C/E (external resistors)
MAX1771MJA (external resistors)
3.0
3.1
Minimum Start-Up Voltage
Supply Current
Standby Current
V+ = 16.5V, SHDN = 0V (normal operation)
V+ = 10V, SHDN 1.6V (shutdown)
V+ = 16.5V, SHDN 1.6V (shutdown)
Output Voltage (Note 1)
V+ = 2V to 12V, over full load range,
Circuit of Figure 2a
11.52
Output Voltage Line Regulation
(Note 2)
V+ = 5V to 7V, VOUT = 12V
ILOAD = 700mA, Circuit of Figure 2a
Output Voltage Load Regulation
(Note 2)
V+ = 6V, VOUT = 12V, ILOAD = 0mA to
500mA, Circuit of Figure 2a
Maximum Switch On-Time
Minimum Switch Off-Time
Efficiency
Reference Voltage
REF Load Regulation
REF Line Regulation
FB Trip Point Voltage
tON(max)
tOFF(min)
VREF
VFB
V+ = 5V, VOUT = 12V, ILOAD = 500mA,
Circuit of Figure 2a
MAX1771C
IREF = 0µA
MAX1771E
MAX1771M
0µA IREF 100µA
3V V+ 16.5V
MAX1771C/E
MAX1771M
MAX1771C
MAX1771E
MAX1771M
12
1.8
1.4700
1.4625
1.4550
1.4700
1.4625
1.4550
TYP MAX UNITS
12.5
16.5 V
16.5
1.8 2.0
V
85 110
µA
25
µA
4
12.0 12.48
V
5 mV/V
20 mV/A
16 20
2.3 2.8
µs
µs
92 %
1.5 1.5300
1.5 1.5375
V
1.5 1.5450
4 10
mV
4 15
40 100 µV/V
1.5 1.5300
1.5 1.5375
V
1.5 1.5450
2 Maxim Integrated


Part Number MAX1771
Description Step-Up DC-DC Controller
Maker Maxim
Total Page 16 Pages
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