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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1673 Datasheet

Regulated / 125mA-Output / Charge-Pump DC-DC Inverter

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MAX1673 pdf
19-1334; Rev 0; 1/98
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
________________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 -VIN in
Skip regulation mode or -1.5V to -VIN in Linear (LIN)
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
Camcorders
Measurement Instruments
Modems
Analog Signal-Processing Digital Cameras
Applications
____________________________Features
o Regulated Negative Output Voltage
(up to -1 x VIN)
o 125mA Output Current
o 35µA Quiescent Supply Current
(Skip-mode regulation)
o 350kHz Fixed-Frequency, Low-Noise Output
(Linear-mode regulation)
o 2V to 5.5V Input Range
o 1µA Logic-Controlled Shutdown
_______________Ordering Information
PART
MAX1673ESA
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Typical Operating Circuit
___________________Pin Configuration
TOP VIEW
LIN/SKIP 1
CAP+ 2
CAP- 3
SHDN 4
MAX1673
8 IN
7 GND
6 FB
5 OUT
INPUT 2V TO 5.5V
ON
OFF
SHDN IN
FB
MAX1673
CAP+
OUT
CAP-
LIN/SKIP GND
REGULATED
NEGATIVE
OUTPUT
(UP TO -1 x VIN,
UP TO 125mA)
SO
On-Demand™ is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1673 Datasheet

Regulated / 125mA-Output / Charge-Pump DC-DC Inverter

No Preview Available !

MAX1673 pdf
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
ABSOLUTE MAXIMUM RATINGS
IN ..............................................................................-0.3V to +6V
CAP+, FB, LIN/SKIP.....................................-0.3V to (VIN + 0.3V)
SHDN........................................................................-0.3V to +6V
OUT, CAP-................................................................-6V to +0.3V
Continuous Output Current ...............................................135mA
Output Short-Circuit Duration to GND (Note 1) ....................1sec
Continuous Power Dissipation (TA = +70°C)
(derate 5.88mW/°C above +70°C) ...............................450mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: Shorting OUT to IN may damage the device and should be avoided.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = V SHDN = +5V, CIN = 10µF, COUT = 22µF, CFLY = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
LIN/SKIP = GND (Skip mode)
VIN LIN/SKIP = IN (LIN mode)
2.0 5.5
V
2.7 5.5
Minimum Output Voltage
VOUT
LIN/SKIP = GND
LIN/SKIP = IN
0
-1.5
V
Maximum Output Current
IOUT(MAX)
125 mA
Output Voltage
VOUT
R1 =100k, ±1%,
R2 = 60.4k, ±1%,
IOUT = 0mA to
125mA, Figure 1
LIN/SKIP = IN
(LIN mode)
LIN/SKIP = GND
(Skip mode)
-2.90 -3.02 -3.15
-2.92 -3.02 -3.12
V
Quiescent Current (IIN Current)
Shutdown Current (IIN Current)
Line Regulation
Load Regulation
Open-Loop Output Resistance
(Dropout)
Output Resistance to Ground
in Shutdown Mode
IQ
ISHDN
VLNR
VLDR
RO
VFB = -100mV, VOUT = -3V,
LIN/SKIP = IN (LIN mode)
VFB = -25mV, VOUT = -3V,
LIN/SKIP = GND (Skip mode)
SHDN = GND
VIN = 4.5V to 5.5V,
Figure 4,
VREF VIN
LIN/SKIP = IN
(LIN mode)
LIN/SKIP = GND
(Skip mode)
IOUT = 25mA to
125mA, Figure 1
LIN/SKIP = IN
(LIN mode)
LIN/SKIP = GND
(Skip mode)
LIN/SKIP = GND (Skip mode)
SHDN = GND
8 16
0.035
0.1
0.01
0.2
1
1
mA
µA
%/V
0.01
0.005
%/mA
3.5 10
15
2 _______________________________________________________________________________________


Part Number MAX1673
Description Regulated / 125mA-Output / Charge-Pump DC-DC Inverter
Maker Maxim
Total Page 8 Pages
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