MAX652CPA Maxim Integrated Products, MAX652CPA Datasheet

MAX652CPA

Manufacturer Part Number

MAX652CPA

Description

3V or adjustable, high-efficiency, current-limited control scheme, step-down DC-DC controller.

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX652CPA.pdf (16 pages)

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Bonase Electronics (HK) Co., Limited

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MAX652CPA

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The MAX649/MAX651/MAX652 BiCMOS, step-down DC-

DC switching controllers provide high efficiency over

three decades of load current. A unique, current-limited

pulse-frequency-modulated (PFM) control scheme gives

these devices the benefits of pulse-width-modulation

(PWM) converters (high efficiency at heavy loads), while

using only 100µA of supply current (vs. 2mA to 10mA for

PWM converters). The result is high efficiency over loads

ranging from 10mA to more than 2.5A.

These devices use miniature external components.

Their high switching frequency (up to 300kHz) allows

for less than 9mm diameter surface-mount inductors.

The MAX649/MAX651/MAX652 have dropout voltages

less than 1V and accept input voltages up to 16.5V.

Output voltages are preset at 5V (MAX649), 3.3V

(MAX651), and 3V (MAX652). These controllers can

also be adjusted to any voltage from 1.5V to the input

voltage by using two resistors.

These step-down controllers drive external P-channel

MOSFETs at loads greater than 10W. If less power is

required, use the MAX639/MAX640/MAX653 step-down

converters with on-chip FETs, which allow up to a

225mA load current.

________________________Applications

19-0225; Rev 3; 9/97

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

__________Typical Operating Circuit

_______________General Description

ON/OFF

4V TO 16.5V

5V-to-3.3V Green PC Applications

High-Efficiency Step-Down Regulation

Minimum-Component DC-DC Converters

Battery-Powered Applications

INPUT

SHDN

REF

5V/3.3V/3V or Adjustable, High-Efficiency,

MAX651

________________________________________________________________ Maxim Integrated Products

GND

OUT

EXT

Low I

V+

, Step-Down DC-DC Controllers

OUTPUT

3.3V

____________________________Features

Ordering Information continued at end of data sheet.

* Dice are tested at T

**Contact factory for availability and processing to MIL-STD-883.

______________Ordering Information

__________________Pin Configuration

MAX649CPA

MAX649CSA

MAX649C/D

MAX649EPA

MAX649ESA

MAX649MJA

More than 90% Efficiency (10mA to 1.5A Loads)

More than 12.5W Output Power

100µA Max Quiescent Supply Current

5µA Max Shutdown Supply Current

Less than 1.0V Dropout Voltage

16.5V Max Input Voltage

5V (MAX649), 3.3V (MAX651), 3V (MAX652),

or Adjustable Output Voltage

Current-Limited Control Scheme

Up to 300kHz Switching Frequency

TOP VIEW

PART

SHDN

OUT

REF

-40°C to +85°C

-55°C to +125°C

TEMP. RANGE

= +25°C.

0°C to +70°C

MAX649

MAX651

MAX652

DIP/SO

8 Plastic DIP

8 SO

Dice*

8 Plastic DIP

8 SO

8 CERDIP**

PIN-PACKAGE

GND

EXT

V+

Related parts for MAX652CPA

MAX652CPA Summary of contents

Page 1

... CS ON/OFF EXT P OUT REF FB GND ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. , Step-Down DC-DC Controllers Q ____________________________Features More than 90% Efficiency (10mA to 1.5A Loads) More than 12.5W Output Power 100µA Max Quiescent Supply Current 5µ ...

Page 2

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q ABSOLUTE MAXIMUM RATINGS Supply Voltage GND.......................................-0.3V, +17V REF, SHDN, FB, CS, EXT, OUT .......................-0.3V, (V+ + 0.3V) Continuous Power Dissipation (T = +70°C) A Plastic DIP (derate ...

Page 3

Adjustable, High-Efficiency, Low I ELECTRICAL CHARACTERISTICS (continued) ( unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL Output Voltage Circuit of Load Regulation Figure 1 Circuit ...

Page 4

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE 16. 10V ...

Page 5

Adjustable, High-Efficiency, Low I ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A EXT RISE AND FALL TIMES vs. TEMPERATURE (1nF) 130 C = 1nF V+ = 5V, t 120 EXT RISE 110 100 90 80 ...

Page 6

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q _____________________________Typical Operating Characteristics (continued) MAX649 LINE-TRANSIENT RESPONSE 250 s/div LOAD A: INPUT VOLTAGE (7V & 12V), 5V/div B: 5V OUT, AC COUPLED, 100mV/div ______________________________________________________________Pin Description PIN ...

Page 7

Adjustable, High-Efficiency, Low MAX649 0.1 MAX651 6 CS MAX652 Si9430 SHDN EXT 4 1 REF OUT FB GND 0.1 F NSQ03A02L * SILICONIX SURFACE-MOUNT MOSFET ...

Page 8

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q MAX649 MAX651 MAX652 SHDN REF MINIMUM Q OFF-TIME TRIG ONE-SHOT MAXIMUM TRIG ON-TIME Q ONE-SHOT CURRENT CONTROL CIRCUITS Figure 2. Block Diagram 8 _______________________________________________________________________________________ V+ FB DUAL-MODE™ COMPARATOR ERROR ...

Page 9

Adjustable, High-Efficiency, Low I 2 s/div V+ = 10V 1.3A LOAD CIRCUIT OF FIGURE 150m Figure 3a. MAX649 Continuous-Conduction Mode, Heavy Load-Current Waveform (500mA/div) inductor, and the control circuit adjusts the switch duty ...

Page 10

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q 3 0.06 2 0. 0. 0. 0.14 S ...

Page 11

Adjustable, High-Efficiency, Low I Standard wire-wound and metal-film resistors have an inductance high enough to degrade performance. Surface-mount (chip) resistors have very little induc- tance and are well suited for use as current-sense resistors. A wire resistor made ...

Page 12

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q a drain-to-source rating of -20V and a typical on-resis- tance of 0.115Ω with V = -4.5V. Tables 1 and 2 GS list suppliers of switching transistors suitable ...

Page 13

... MAX651CSA 0°C to +70°C MAX651C/D 0°C to +70°C MAX651EPA -40°C to +85°C MAX651ESA -40°C to +85°C MAX651MJA -55°C to +125°C MAX652CPA 0°C to +70°C MAX652CSA 0°C to +70°C MAX652C/D 0°C to +70°C MAX652EPA -40°C to +85°C MAX652ESA -40°C to +85°C MAX652MJA -55° ...

Page 14

Adjustable, High-Efficiency, Low I , Step-Down DC-DC Controllers Q ________________________________________________________Package Information 14 ______________________________________________________________________________________ ...

Page 15

Adjustable, High-Efficiency, Low I ___________________________________________Package Information (continued) ______________________________________________________________________________________ , Step-Down DC-DC Controllers Q 15 ...

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 © 1997 Maxim Integrated Products ...

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