MAX1673ESA ,Regulated / 125mA-Output / Charge-Pump DC-DC InverterELECTRICAL CHARACTERISTICS(V = V = +5V, C = 10µF, C = 22µF, C = 2.2µF, T = -40°C to +85°C, unless o ..
MAX1673ESA ,Regulated / 125mA-Output / Charge-Pump DC-DC InverterApplications Typical Operating CircuitINPUT 2V TO 5.5V___________________Pin ConfigurationONINREGUL ..
MAX1673ESA ,Regulated / 125mA-Output / Charge-Pump DC-DC InverterFeaturesThe MAX1673 charge-pump inverter provides a low-' Regulated Negative Output Voltagecost, co ..
MAX1673ESA+ ,Regulated, 125mA Output, Charge Pump DC-DC InverterApplicationsHard Disk Drives Measurement InstrumentsCamcorders ModemsAnalog Signal-Processing Digit ..
MAX1673ESA+T ,Regulated, 125mA Output, Charge Pump DC-DC InverterFeaturesThe MAX1673 charge-pump inverter provides a low-♦ Regulated Negative Output Voltagecost, co ..
MAX1673ESA+T ,Regulated, 125mA Output, Charge Pump DC-DC Inverterfeatures a 1μA logic-controlled shut-MAX1673ESA -40°C to +85°C 8 SOdown mode and is available in a ..
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MAX1673ESA
Regulated / 125mA-Output / Charge-Pump DC-DC Inverter
________________General DescriptionThe 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 -VINin
Skip regulation mode or -1.5V to -VINin 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.
________________________ApplicationsHard Disk DrivesMeasurement Instruments
CamcordersModems
Analog Signal-Processing Digital Cameras
Applications
____________________________FeaturesRegulated Negative Output Voltage
(up to -1 x VIN)125mA Output Current35µA Quiescent Supply Current
(Skip-mode regulation)350kHz Fixed-Frequency, Low-Noise Output
(Linear-mode regulation)2V to 5.5V Input Range1µA Logic-Controlled Shutdown
MAX1673
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverterypical Operating Circuit
___________________Pin Configuration19-1334; Rev 0; 1/98
On-Demand™ is a trademark of Maxim Integrated Products.
MAX1673
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VSHDN= +5V, CIN= 10µF, COUT= 22µF, CFLY= 2.2µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.) (Note 2)
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.
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.
MAX1673
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
ELECTRICAL CHARACTERISTICS (continued)(VIN= VSHDN= +5V, CIN= 10µF, COUT= 22µF, CFLY= 2.2µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.) (Note 2)
Note 2:Specifications to -40°C are guaranteed by design, not production tested.
MAX1673
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverterypical Operating Characteristics(Circuit of Figure 1, VIN= +5V, CFLY= 2.2µF, COUT= 22µF, TA= +25°C, unless otherwise noted.)
MAX1673
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= +5V, CFLY= 2.2µF, COUT= 22µF, TA= +25°C, unless otherwise noted.)
MAX1673
Detailed DescriptionThe MAX1673 new-generation, high-output-current,
regulated charge-pump DC-DC inverter provides up to
125mA. Designed specifically for compact applica-
tions, a complete regulating circuit requires only three
small capacitors and two resistors. The MAX1673
employs On-Demand™ regulation circuitry, providing
output regulation modes optimized for either lowest out-
put noise or lowest supply current. In addition, the
MAX1673 includes shutdown control.
In Linear (LIN) mode or when heavily loaded in Skip
mode, the charge pump runs continuously at 350kHz.
During one-half of the oscillator period, switches S1 and
S2 close (Figure 2), charging the transfer capacitor
(CFLY) to the input voltage (CAP- = GND, and CAP+ =
IN). During the other half cycle, switches S3 and S4
close (Figure 3), transferring the charge on CFLYto the
output capacitor (CAP+ = GND, CAP- = OUT).
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
______________________________________________________________Pin DescriptionFigure 1. Standard Application Circuit
Figure 2. Charging CFLY
Figure 3. Transferring Charge on CFLYto COUT
