IC DC-DC INVERT 125MA 8-SOIC

 

MAX1673ESA+T

Manufacturer Part NumberMAX1673ESA+T
DescriptionIC DC-DC INVERT 125MA 8-SOIC
ManufacturerMaxim Integrated Products
TypeSwitched Capacitor (Charge Pump), Inverting
MAX1673ESA+T datasheets

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Specifications of MAX1673ESA+T

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - Output-1.5 ~ -5.5 V
Current - Output125mAFrequency - Switching350kHz
Voltage - Input2 ~ 5.5 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case8-SOIC (3.9mm Width)
Power - Output450mWFunctionInverting
Output Voltage- 2.9 V to - 3.15 VOutput Current125 mA
Maximum Operating Temperature+ 85 CMinimum Operating Temperature- 40 C
Mounting StyleSMD/SMTLead Free Status / RoHS StatusLead free / RoHS Compliant
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19-1334; Rev 0; 1/98
________________General Description
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.
________________________Applications
Hard Disk Drives
Measurement Instruments
Camcorders
Modems
Analog Signal-Processing
Digital Cameras
Applications
___________________Pin Configuration
TOP VIEW
LIN/SKIP
1
CAP+
2
MAX1673
CAP-
3
SHDN
4
SO
On-Demand™ is a trademark of Maxim Integrated Products.
________________________________________________________________ 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.
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
____________________________Features
Regulated Negative Output Voltage
(up to -1 x V
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)
2V to 5.5V Input Range
1µA Logic-Controlled Shutdown
_______________Ordering Information
PART
MAX1673ESA
INPUT 2V TO 5.5V
ON
8
IN
7
GND
6
FB
5
OUT
)
IN
TEMP. RANGE
PIN-PACKAGE
-40°C to +85°C
8 SO
Typical Operating Circuit
IN
OFF
SHDN
FB
MAX1673
CAP+
OUT
CAP-
LIN/SKIP
GND
REGULATED
NEGATIVE
OUTPUT
(UP TO -1 x V
,
IN
UP TO 125mA)
1

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MAX1673ESA+T Summary of contents

  • Page 1

    ... MAX1673 CAP- 3 SHDN 4 SO On-Demand™ trademark of Maxim Integrated Products. ________________________________________________________________ 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. Regulated, 125mA-Output, Charge-Pump DC-DC Inverter ____________________________Features Regulated Negative Output Voltage ...

  • 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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