MAX1673ESA-T Maxim Integrated Products, MAX1673ESA-T Datasheet

MAX1673ESA-T

Manufacturer Part Number

MAX1673ESA-T

Description

Charge Pumps Regulated 125mA Charge Pump

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1673ESA.pdf (8 pages)

Specifications of MAX1673ESA-T

Function

Inverting

Output Voltage

- 2.9 V to - 3.15 V

Output Current

125 mA

Maximum Operating Temperature

+ 85 C

Package / Case

SOIC-8 Narrow

Minimum Operating Temperature

- 40 C

Mounting Style

SMD/SMT

Current page: 1 of 8
Download datasheet (82Kb)

The MAX1673 charge-pump inverter provides a low-

cost, compact means of generating a regulated nega-

tive output from a positive input at up to 125mA. It

requires only three small capacitors, and only two resis-

tors to set its output voltage. The input range is 2V to

5.5V. The regulated output can be set from 0V to -V

Skip regulation mode or -1.5V to -V

regulation mode.

In Skip mode, the MAX1673 regulates by varying its

switching frequency as a function of load current. This

On-Demand™ switching gives the MAX1673 two

advantages: very small capacitors and very low quies-

cent supply current. At heavy loads, it transfers energy

from the input to the output by switching at up to

350kHz. It switches more slowly at light loads, using

only 35µA quiescent supply current.

In Linear mode, the MAX1673 switches at a constant

350kHz at all loads and regulates by controlling

the current-path resistance. This provides constant-

frequency ripple, which is easily filtered for low-noise

applications.

This device also features a 1µA logic-controlled shut-

down mode and is available in a standard 8-pin SO

package. For a device that delivers about 10mA and

fits in a smaller package, refer to the MAX868.

Hard Disk Drives

Camcorders

Analog Signal-Processing

Applications

________________________Applications

19-1334; Rev 0; 1/98

________________General Description

___________________Pin Configuration

On-Demand™ is a trademark of Maxim Integrated Products.

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

For small orders, phone 408-737-7600 ext. 3468.

TOP VIEW

LIN/SKIP

SHDN

CAP+

CAP-

________________________________________________________________ Maxim Integrated Products

MAX1673

Measurement Instruments

Modems

Digital Cameras

GND

OUT

in Linear (LIN)

Charge-Pump DC-DC Inverter

Regulated, 125mA-Output,

____________________________Features

_______________Ordering Information

MAX1673ESA

Regulated Negative Output Voltage

(up to -1 x V

125mA Output Current

35µA Quiescent Supply Current

(Skip-mode regulation)

350kHz Fixed-Frequency, Low-Noise Output

(Linear-mode regulation)

2V to 5.5V Input Range

1µA Logic-Controlled Shutdown

INPUT 2V TO 5.5V

PART

OFF

Typical Operating Circuit

)

SHDN

CAP+

CAP-

TEMP. RANGE

-40°C to +85°C

MAX1673

LIN/SKIP

GND

OUT

PIN-PACKAGE

8 SO

(UP TO -1 x V

UP TO 125mA)

REGULATED

NEGATIVE

OUTPUT

Related parts for MAX1673ESA-T

MAX1673ESA-T Summary of contents

Page 1

... Regulated Negative Output Voltage ( 125mA Output Current 35µA Quiescent Supply Current in IN (Skip-mode regulation) in Linear (LIN) IN 350kHz Fixed-Frequency, Low-Noise Output (Linear-mode regulation 5.5V Input Range 1µA Logic-Controlled Shutdown _______________Ordering Information PART MAX1673ESA INPUT GND OUT ) IN TEMP. RANGE PIN-PACKAGE -40°C to +85°C ...

Page 2

Regulated, 125mA-Output, Charge-Pump DC-DC Inverter ABSOLUTE MAXIMUM RATINGS IN ..............................................................................-0.3V to +6V CAP+, FB, LIN/SKIP.....................................-0. SHDN........................................................................-0.3V to +6V OUT, CAP-................................................................-6V to +0.3V Continuous Output Current ...............................................135mA Output Short-Circuit Duration to GND (Note 1) ....................1sec Note 1: Shorting OUT ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +5V 10µF, C SHDN IN IN OUT T = +25°C.) (Note 2) A PARAMETER SYMBOL Switching Frequency (LIN Mode) FB Threshold V FB Input Bias Current Input Bias Current (SHDN, LIN/SKIP) ...

Page 4

Regulated, 125mA-Output, Charge-Pump DC-DC Inverter (Circuit of Figure +5V 2.2µ FLY OUTPUT RIPPLE vs. LOAD CURRENT (LIN MODE) 140 C OUT C = FLY OUT 10 120 100 C ...

Page 5

Figure +5V 2.2µ FLY LOAD-TRANSIENT RESPONSE (LIN MODE) I OUT 100mA/div V OUT 50mV/div CIRCUIT OF FIGURE 4 250 s/div LINE-TRANSIENT RESPONSE (LIN MODE 2V/div V OUT I = ...

Page 6

Regulated, 125mA-Output, Charge-Pump DC-DC Inverter ______________________________________________________________Pin Description PIN NAME Regulation-Mode Select Input. Driving LIN/SKIP high or connecting selects LIN mode, with regula- 1 LIN/SKIP tion accomplished by modulating switch resistance. Driving LIN/SKIP low or connecting it to ...

Page 7

Linear Mode (Constant-Frequency Mode) In LIN mode (LIN/SKIP = IN), the charge pump runs con- tinuously at 350kHz. The MAX1673 controls the charge varying the gate drive on S1 (Figure 2). FLY When the output voltage falls, ...

Page 8

... 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. _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 8 © ...

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