MAX1642 Datasheet, PDF (2/12 Pages) Maxim Integrated Products – High-Efficiency, Step-Up DC-DC Converters for 1V Inputs

High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
ABSOLUTE MAXIMUM RATINGS
BATT to GND ...........................................................-0.3V to 6.0V
BATT Forward Current ..........................................................0.5A
OUT to GND.............................................................-0.3V to 6.0V
OUT, LX Current.......................................................................1A
LX to GND................................................................-0.3V to 6.0V
SHDN, FB, BATTLO, PFO to GND ...........................-0.3V to 6.0V
PFI to GND ............................................................-0.3V to V_BATT
Reverse Battery Current (T_A = +25°C) (Note 1) ...............220mA
Continuous Power Dissipation
µMAX (derate 4.1mW/°C above 70°C)..........................330mW
Operating Temperature Range
MAX1642EUA/MAX1643EUA ............................-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 = 0mA, 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)
Maximum Operating Input Voltage
0.7
V
1.65
V
Start-Up Voltage (Note 2)
Start-Up Voltage Tempco
R_L = 3kΩ, T_A = +25°C
0.88
-2
V
mV/°C
Output Voltage
V_OUT
V_FB < 0.1V
3.16 3.30 3.44
V
Output Voltage Range
External feedback
2.0
5.2
V
FB Set Voltage
N-Channel On-Resistance
P-Channel On-Resistance
V_FB
External feedback
V_OUT = 3.3V
V_OUT = 3.3V
1.18 1.225 1.27
V
1
1.5
Ω
1.5
2.2
Ω
P-Channel Catch-Diode Voltage
I_DIODE = 100mA, P-channel switch off
0.8
V
On-Time Constant
Off-Time Tracking Ratio (Note 3)
K
RATIO
0.9V < V_BATT < 1.5V (t_ON = K / V_BATT)
0.9V < V_BATT < 1.5V, V_OUT = 3.3V
17
25
35
V-µs
1
1.5
Quiescent Current into OUT
Quiescent Current into BATT
I_QOUT
I_QBATT
V_OUT = 3.5V
11
18
µA
4
6.5
µA
Shutdown Current into OUT
I_SHDN,OUT V_OUT = 3.5V (MAX1642)
0.1
1
µA
Shutdown Current into BATT
Efficiency
I_SHDN,BATT V_BATT = 1.0V (MAX1642)
η
I_LOAD = 20mA
2
3.5
µA
80
%
FB Input Current
PFI Trip Voltage
V_FB = 1.3V
Falling PFI, hysteresis = 1%
10
nA
590
614
632
mV
PFI Input Current
PFO, BATTLO Low Output Voltage
PFO, BATTLO Leakage Current
BATTLO Trip Voltage
SHDN Input Low Voltage
SHDN Input High Voltage
SHDN Input Current
V_PFI = 650mV
10
nA
V_OL
V_PFI = 0V, V_OUT = 3.3V, I_SINK = 1mA
0.4
V
V_PFI = 650mV, V_PFO = 6V
1
µA
V_OUT = 3.3V, hysteresis = 2% (MAX1643) 0.96
1.0
1.04
V
V_IL
% of V_BATT (MAX1642)
20
%
V_IH
% of V_BATT (MAX1642)
80
%
(MAX1642)
10
nA
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