MAX1673ESA+T Maxim Integrated Products, MAX1673ESA+T Datasheet

IC DC-DC INVERT 125MA 8-SOIC

MAX1673ESA+T

Manufacturer Part Number
MAX1673ESA+T
Description
IC DC-DC INVERT 125MA 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet

Specifications of MAX1673ESA+T

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
-1.5 ~ -5.5 V
Current - Output
125mA
Frequency - Switching
350kHz
Voltage - Input
2 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
450mW
Function
Inverting
Output Voltage
- 2.9 V to - 3.15 V
Output Current
125 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
1
2
4
3
MAX1673
SO
Measurement Instruments
Modems
Digital Cameras
6
8
7
5
IN
IN
GND
FB
OUT
in Linear (LIN)
Charge-Pump DC-DC Inverter
IN
Regulated, 125mA-Output,
in
____________________________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
ON
INPUT 2V TO 5.5V
PART
OFF
IN
Typical Operating Circuit
)
SHDN
CAP+
CAP-
TEMP. RANGE
-40°C to +85°C
MAX1673
LIN/SKIP
IN
GND
OUT
FB
PIN-PACKAGE
8 SO
(UP TO -1 x V
UP TO 125mA)
REGULATED
NEGATIVE
OUTPUT
IN
,
1

Related parts for MAX1673ESA+T

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 © ...

Related keywords