MAX1771CSA Maxim Integrated Products, MAX1771CSA Datasheet

IC DC/DC CTRLR STEP-UP HE 8-SOIC

MAX1771CSA

Manufacturer Part Number
MAX1771CSA
Description
IC DC/DC CTRLR STEP-UP HE 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet

Specifications of MAX1771CSA

Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
12V, 2 ~ 16.5 V
Current - Output
2A
Frequency - Switching
300kHz
Voltage - Input
2 ~ 16.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
471mW
Output Voltage
12 V
Output Current
2 A
Input Voltage
2 V to 16.5 V
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Case
SOP8
Dc
02+
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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.
19-0263; Rev 2; 3/02
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.
2V TO V
INPUT
Positive LCD-Bias Generators
Flash Memory Programmers
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
ON/OFF
OUT
Typical Operating Circuit
SHDN
REF
________________________________________________________________ Maxim Integrated Products
MAX1771
FB AGND GND
General Description
EXT
CS
V+
12V or Adjustable, High-Efficiency,
Low I
Applications
N
Q
OUTPUT
12V
, Step-Up DC-DC Controller
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
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
MAX1771CPA
MAX1771CSA
MAX1771C/D
MAX1771EPA
MAX1771ESA
MAX1771MJA
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
Ordering Information
MAX1771
DIP/SO
Pin Configuration
8
7
6
5
CS
GND
AGND
REF
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
PIN-PACKAGE
Features
1

Related parts for MAX1771CSA

MAX1771CSA Summary of contents

Page 1

... Shutdown Current 16.5V Input Range o Preset 12V or Adjustable Output Voltage o Current-Limited PFM Control Scheme 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. ...

Page 2

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller Q ABSOLUTE MAXIMUM RATINGS Supply Voltage V+ to GND ...............................................................-0.3V, 17V EXT, CS, REF, SHDN GND ...................-0.3V, (V+ + 0.3V) GND to AGND.............................................................0.1V, -0.1V Continuous Power Dissipation (T ...

Page 3

Adjustable, High-Efficiency, ELECTRICAL CHARACTERISTICS (continued) ( 0mA LOAD A MIN PARAMETERS SYMBOL FB Input Current I SHDN Input High Voltage V SHDN Input Low Voltage V SHDN Input Current ...

Page 4

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE 12V OUT IN CIRCUIT OF FIGURE 2a BOOTSTRAPPED MODE 3 ENTIRE CIRCUIT ...

Page 5

Adjustable, High-Efficiency, (Circuit of Figure 2a +25°C, unless otherwise noted.) A HEAVY-LOAD SWITCHING WAVEFORMS 2µs/div 900mA 12V IN OUT OUT A: EXT VOLTAGE, 10V/div B: INDUCTOR ...

Page 6

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller Q (Circuit of Figure 2a +25°C, unless otherwise noted.) A PIN NAME 1 EXT Gate Drive for External N-Channel Power Transistor 2 V+ Power-Supply Input. Also acts as ...

Page 7

Adjustable, High-Efficiency, Detailed Description The MAX1771 is a BiCMOS, step-up, switch-mode power-supply controller that provides a preset 12V out- put, in addition to adjustable-output operation. Its unique control scheme combines the advantages of pulse-frequency modulation (low supply current) ...

Page 8

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller 0.1µ REF C3 L1 0.1µF MAX1771 22µH 4 SHDN 1N5817- EXT Si9410DY/ MTD20N03HDL 8 6 AGND CS ...

Page 9

Adjustable, High-Efficiency, The control circuitry allows the IC to operate in continu- ous-conduction mode (CCM) while maintaining high efficiency with heavy loads. When the power switch is turned on, it stays on until either 1) the maximum on- ...

Page 10

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller Q 3 OUT L = 22µH 3 20mΩ SENSE 2 25mΩ SENSE 2.0 R SENSE 1.5 1.0 R SENSE 0 100mΩ ...

Page 11

Adjustable, High-Efficiency, Power Transistor Selection Use an N-channel MOSFET power transistor with the MAX1771. To ensure the external N-channel MOSFET (N-FET) is turned on hard, use logic-level or low-threshold N-FETs when the input drive voltage is less than ...

Page 12

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller Q Table 1. Component Suppliers PRODUCTION INDUCTORS Sumida CD54 series CDR125 series Coiltronics Surface Mount CTX20 series Coilcraft DO3316 series DO3340 series Sumida RCH855 series Through Hole RCH110 series SUPPLIER ...

Page 13

Adjustable, High-Efficiency 2.2µ 11V 1N5817 20µ CTX20-4 SHDN 3V = OFF MAX1771 EXT Q1** REF 0.1µ GND AGND ...

Page 14

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controller 4.5V TO 15V C1 33µF L1 16V 2 20µH OFF V+ 4 C2* SHDN 1µF ON MAX1771 1 Q1** EXT AGND ...

Page 15

Adjustable, High-Efficiency, D03340 220µH–680µ EXT SHDN C5 0.1µ REF 2 MAX1771 AGND GND C6 10µF 100V Figure 7. -48V Input to 5V Output at 300mA, Without a Transformer ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products OUTPUT ...

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