MAX1678 Datasheet, PDF (2/12 Pages) Maxim Integrated Products – 1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter

1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
BATT, OUT,LX, SHDN to GND ..............................-0.3V to +6.0V
OUT, LX Current.......................................................................1A
FB, PFI, PFO to GND ................................-0.3V to (V_OUT + 0.3V)
Reverse Battery Current (T_A = +25°C) (Note 1) ...............220mA
Continuous Power Dissipation (T_A = +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
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.
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
(V_BATT = V_SHDN = 1.3V, I_LOAD = 0, FB = GND, T_A = 0°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Input
Voltage
V_BATT(MIN)
0.7
V
Maximum Operating Input
Voltage
V_BATT(MAX)
5.5
V
Start-Up Voltage (Note 2)
Start-Up Voltage Tempco
R_L = 3kΩ, T_A = +25°C
0.87
-2
V
mV/°C
Output Voltage (Fixed Mode)
Output Voltage Range
(Adjustable Mode)
V_OUT
V_FB < 0.1V
External feedback
3.16
3.3
3.44
V
2.0
5.5
V
FB Set Voltage
N-Channel On-Resistance
P-Channel On-Resistance
P-Channel Catch Diode Voltage
Maximum Peak LX Current
On-Time Constant
Quiescent Current into OUT
Quiescent Current into BATT
Shutdown Current into OUT
Shutdown Current into BATT
Efficiency
FB Input Current
PFI Trip Voltage
PFI Input Current
PFO Low Output Voltage
PFO Leakage Current
SHDN Input Low Voltage
SHDN Input High Voltage
SHDN Input Current
V_FB
I_LX(MAX)
K
I_Q,OUT
I_Q,BATT
I_SHDN,OUT
I_SHDN,BATT
η
V_IL,PFI
V_OL
V_IL
V_IH
External feedback
V_OUT = 3.3V
V_OUT = 3.3V
I_DIODE = 100mA, P-channel switch off
0.9V < V_BATT < 3.3V (t_ON = K / V_BATT)
V_OUT = 3.5V
V_OUT = 3.5V
V_BATT = 1V
I_LOAD = 20mA, V_BATT = 2.5V (Figure 7)
V_FB = 1.3V
Falling PFI hysteresis 2%
V_PFI = 650mV
V_PFI = 0, V_OUT = 3.3V, I_SINK = 1mA
V_PFI = 650mV, V_PFO = 6V
SHDN = GND or BATT
1.19 1.23 1.26
1
1.5
1.5
2.2
0.8
550
5.60
8
11.2
37
65
4
8
0.1
1
2
3.5
90
0.1
10
590
614
632
0.1
10
0.04
0.4
0.01
1
0.8 x V_BATT
0.2 x V_BATT
0.1
10
V
Ω
Ω
V
mA
V-µs
µA
µA
µA
µA
%
nA
mV
nA
V
µA
V
V
nA
2 _______________________________________________________________________________________