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 ..
MAX1673ESA-T ,Regulated, 125mA Output, Charge Pump DC-DC InverterApplications Typical Operating CircuitINPUT 2V TO 5.5V___________________Pin ConfigurationONINREGUL ..
MAX1673ESA-T ,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 ..
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MAX1674EUA ,High-Efficiency / Low-Supply-Current / Compact / Step-Up DC-DC ConvertersELECTRICAL CHARACTERISTICS (continued)(V = 2V, FB = OUT (V = 3.3V), R = ˙∞, T = 0°C to +85°C, unles ..
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MAX1673ESA+-MAX1673ESA+T-MAX1673ESA-T
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 Shutdowngulated, 125mA-Output,
Charge-Pump DC-DC InverterOUTSHDN
GNDCAP+
CAP-
LIN/SKIP
TOP VIEW
MAX1673
MAX1673
INPUT 2V TO 5.5V
REGULATED
NEGATIVE
OUTPUT
(UP TO -1 x VIN,
UP TO 125mA)
LIN/SKIP
OUT
GND
CAP+
OFFSHDN
CAP-
Typical Operating Circuit
___________________Pin Configuration19-1334; Rev 0; 1/98
PARTMAX1673ESA-40°C to +85°C
TEMP. RANGEPIN-PACKAGE8 SO
_______________Ordering InformationOn-Demand™ is a trademark of Maxim Integrated Products.
gulated, 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.
Output Resistance to Ground
in Shutdown Mode15ΩSHDN= GND
Load RegulationΔVLDR
%/mA
LIN/SKIP= IN
(LIN mode)
LIN/SKIP= GND
(Skip mode)
IOUT= 25mA to
125mA, Figure 1
LIN/SKIP= GND
(Skip mode)
LIN/SKIP= IN
(LIN mode)
SHDN= GND
VFB= -25mV, VOUT= -3V,
LIN/SKIP= GND (Skip mode)
VFB= -100mV, VOUT= -3V,
LIN/SKIP= IN (LIN mode)
LIN/SKIP= GND
(Skip mode)
LIN/SKIP= IN
(LIN mode)R1 =100kΩ, ±1%,
R2 = 60.4kΩ, ±1%,
IOUT= 0mA to
125mA, Figure 1
PARAMETERSYMBOLMINTYPMAXUNITSOutput VoltageVOUT
Maximum Output CurrentIOUT(MAX)125mA
Minimum Output Voltage-1.5
Input Voltage RangeVIN2.05.5V2.75.5
VOUT0V
Quiescent Current (IINCurrent)IQ16
Shutdown Current (IINCurrent)ISHDN0.11μA
Line RegulationΔVLNR
%/V
Open-Loop Output Resistance
(Dropout)RO3.510Ω
CONDITIONSLIN/SKIP= IN
VIN= 4.5V to 5.5V,
Figure 4,
VREF≠VIN
LIN/SKIP= GND (Skip mode)
LIN/SKIP= IN (LIN mode)
LIN/SKIP= GND
LIN/SKIP= GND (Skip mode)
VFB= -25mV
gulated, 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.
Logic Low Input
(SHDN, LIN/SKIP)VIL0.3 x VINV2V ≤VIN≤5.5V
Logic High Input
(SHDN, LIN/SKIP)VIH0.7 x VINV2V ≤VIN≤5.5V
FB Input Bias CurrentIFB
LIN/SKIP= IN
(LIN mode)
PARAMETERSYMBOLMINTYPMAXUNITSFB ThresholdVFBT-25025mV
Switching Frequency
(LIN Mode)ƒOSC250350460kHz
CONDITIONSInput Bias Current
(SHDN, LIN/SKIP)
LIN/SKIP= GND (Skip mode)= +25°CμA100LIN/SKIP= GND
(Skip mode)
VFB= -25mV= -40°C to +85°C205515
gulated, 125mA-Output,Charge-Pump DC-DC Inverter
Typical Operating Characteristics(Circuit of Figure 1, VIN= +5V, CFLY= 2.2μF, COUT= 22μF, TA= +25°C, unless otherwise noted.)
OUTPUT RIPPLE
vs. LOAD CURRENT (LIN MODE)
X1673 RTOC01
LOAD CURRENT (mA)
(m
COUT = 10mFCFLY = COUT
10
COUT = 22mF
COUT = 47mF
OUTPUT RIPPLE
vs. LOAD CURRENT (SKIP MODE)
1673 TO
C02
LOAD CURRENT (mA)
(m
COUT = 10mF
COUT = 22mF
COUT = 47mF
CFLY = COUT
10-2.98
OUTPUT VOLTAGE
vs. LOAD CURRENT
AX1673 TOC03
LOAD CURRENT (mA)
T (V
LIN MODE
SKIP MODE
EFFICIENCY vs. LOAD CURRENT
(SKIP MODE)
1673 TO
C04
LOAD CURRENT (mA)
(%
VIN = 3.5V
VIN = 4V
VIN = 5V
CIRCUIT OF FIGURE 4
VREF „ VIN
TA = +25°C4356
DROPOUT OUTPUT RESISTANCE
vs. INPUT VOLTAGE1673 TO
C07
VIN (V)
(W
TA = +85°C
TA = -40°C40602080100120140
EFFICIENCY vs. LOAD CURRENT
(LIN MODE)AX1673 TOC
LOAD CURRENT (mA)
(%
VIN = 4V
VIN = 4.5V
VIN = 5V
CIRCUIT OF FIGURE 4
VREF „ VIN
EFFICIENCY vs. INPUT VOLTAGE
AX1673 TOC
VIN (V)
(%
SKIP MODE
LIN MODE
100mA LOAD
VOUT = -3V
CIRCUIT OF FIGURE 4
VREF „ VIN4356
QUIESCENT CURRENT vs. INPUT VOLTAGE
(LIN MODE)1673 TO
C08
VIN (V)
Q
(m
DOES NOT INCLUDE BIAS CURRENT
FOR RESISTOR DIVIDER
VREF „ VIN
CIRCUIT OF FIGURE 44356
QUIESCENT CURRENT vs. INPUT VOLTAGE
(SKIP MODE)AX1673 TOC
VIN (V)
Q
(m
DOES NOT INCLUDE BIAS CURRENT
FOR RESISTOR DIVIDER
gulated, 125mA-OutputCharge-Pump DC-DC InverterVOUT
50mV/div
25mA
125mAIOUT
100mA/div
LOAD-TRANSIENT RESPONSE (LIN MODE)MAX1673 TOC10
250ms/div
CIRCUIT OF FIGURE 4
VOUT
50mV/div
25mA
125mA
LOAD-TRANSIENT RESPONSE (SKIP MODE)MAX1673 TOC11
250ms/div
CIRCUIT OF FIGURE 4
IOUT
100mA/div
VOUT
50mV/div
4.5V
5.5VVIN
2V/div
LINE-TRANSIENT RESPONSE (LIN MODE)MAX1673 TOC12
50ms/div
IOUT = 100mA
CIRCUIT OF FIGURE 4
VOUT
50mV/div
4.5V
5.5VVIN
2V/div
LINE-TRANSIENT RESPONSE (SKIP MODE)MAX1673 TOC13
50ms/div
IOUT = 100mA
CIRCUIT OF FIGURE 4
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= +5V, CFLY= 2.2μF, COUT= 22μF, TA= +25°C, unless otherwise noted.)
tailed 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).
gulated, 125mA-Output,
Charge-Pump DC-DC Inverter
______________________________________________________________Pin DescriptionMAX1673
INPUT
5.0V
OUTPUT
-3V
CIN
10mF
COUT
22mF
CFLY
2.2mF
LIN/SKIP
100k
60.4k
OUT
GND
CAP+
OFF4
SHDN
CAP-
LIN
SKIP1
Figure 1. Standard Application Circuit
OUT
COUTCFLYCAP+
CAP-
350kHz
Figure 2. Charging CFLY
OUT
COUTCFLY
350kHz
CAP+
CAP-
Figure 3. Transferring Charge on CFLYto COUT
Inverting Charge-Pump OutputOUT5
Feedback Input. Connect FB to a resistor-divider from IN (or other reference source) to OUT for regulated
output voltages (Figures 1 and 4).FB6
GroundGND7
Power-Supply Positive Voltage InputIN8
Shutdown Control Input. Drive SHDNlow to shut down the MAX1673. Connect SHDNto IN for normal
operation. OUT connects to GND through a 1Ω(typical) resistor in shutdown mode.SHDN4
Negative Terminal of Flying CapacitorCAP-3
PINPositive Terminal of Flying CapacitorCAP+2
Regulation-Mode Select Input. Driving LIN/SKIPhigh or connecting it to IN selects LIN mode, with regula-
tion accomplished by modulating switch resistance. Driving LIN/SKIPlow or connecting it to GND selects
Skip mode, where the device regulates by skipping charge-pump pulses.
LIN/SKIP1
FUNCTIONNAME
