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MAX1678 Datasheet(PDF) 2 Page - Maxim Integrated Products

Part No. MAX1678
Description  1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
Download  12 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1678 Datasheet(HTML) 2 Page - Maxim Integrated Products

 
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1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VBATT = VSHDN = 1.3V, ILOAD = 0, FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
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.
Note 1: The reverse battery current is measured from the
Typical Operating Circuit’s input terminal to GND when the battery is con-
nected backward. A reverse current of 220mA will not exceed package dissipation limits but, if left for an extended time
(more than 10 minutes), may degrade performance.
BATT, OUT,LX, SHDN to GND ..............................-0.3V to +6.0V
OUT, LX Current.......................................................................1A
FB, PFI, PFO to GND ................................-0.3V to (VOUT + 0.3V)
Reverse Battery Current (TA = +25°C) (Note 1) ...............220mA
Continuous Power Dissipation (TA = +70°C)
µMAX (derate 4.1mW/°C above +70°C) .......................330mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
VPFI = 650mV, VPFO = 6V
RL = 3kΩ, TA = +25°C
VPFI = 0, VOUT = 3.3V, ISINK = 1mA
VPFI = 650mV
Falling PFI hysteresis 2%
VFB = 1.3V
ILOAD = 20mA, VBATT = 2.5V (Figure 7)
VBATT = 1V
IDIODE = 100mA, P-channel switch off
VOUT = 3.5V
VOUT = 3.3V
VOUT = 3.3V
VFB < 0.1V
External feedback
VOUT = 3.5V
External feedback
0.9V < VBATT < 3.3V (tON = K / VBATT)
CONDITIONS
V
0.8 x VBATT
VIH
SHDN Input High Voltage
V
0.2 x VBATT
VIL
SHDN Input Low Voltage
µA
0.01
1
PFO Leakage Current
V
0.04
0.4
VOL
PFO Low Output Voltage
nA
0.1
10
PFI Input Current
mV
590
614
632
VIL,PFI
PFI Trip Voltage
nA
0.1
10
FB Input Current
%
90
η
Efficiency
µA
2
3.5
ISHDN,BATT
Shutdown Current into BATT
µA
0.1
1
ISHDN,OUT
Shutdown Current into OUT
µA
4
8
IQ,BATT
Quiescent Current into BATT
µA
37
65
IQ,OUT
Quiescent Current into OUT
V-µs
5.60
8
11.2
K
On-Time Constant
V
0.87
Start-Up Voltage (Note 2)
V
5.5
VBATT(MAX)
V
0.7
VBATT(MIN)
Minimum Operating Input
Voltage
Maximum Operating Input
Voltage
mA
550
ILX(MAX)
Maximum Peak LX Current
V
0.8
P-Channel Catch Diode Voltage
1.5
2.2
P-Channel On-Resistance
1
1.5
N-Channel On-Resistance
mV/°C
-2
Start-Up Voltage Tempco
V
3.16
3.3
3.44
VOUT
Output Voltage (Fixed Mode)
V
2.0
5.5
Output Voltage Range
(Adjustable Mode)
V
1.19
1.23
1.26
VFB
FB Set Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
SHDN = GND or BATT
nA
0.1
10
SHDN Input Current


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