Absolute maximum ratings, Electrical characteristics – Rainbow Electronics MAX1643 User Manual
Page 2
MAX1642/MAX1643
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
2
_______________________________________________________________________________________
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
R
L
= 3k
Ω
, T
A
= +25°C
V
FB
= 1.3V
I
LOAD
= 20mA
V
BATT
= 1.0V (MAX1642)
0.9V < V
BATT
< 1.5V (t
ON
= K / V
BATT
)
V
OUT
= 3.5V (MAX1642)
I
DIODE
= 100mA, P-channel switch off
V
OUT
= 3.3V
V
FB
< 0.1V
External feedback
External feedback
V
OUT
= 3.5V
V
OUT
= 3.3V
0.9V < V
BATT
< 1.5V, V
OUT
= 3.3V
CONDITIONS
nA
10
FB Input Current
%
80
η
Efficiency
µA
2
3.5
I
SHDN,BATT
Shutdown Current into BATT
µA
0.1
1
I
SHDN,OUT
Shutdown Current into OUT
µA
4
6.5
I
QBATT
Quiescent Current into BATT
µA
11
18
I
QOUT
Quiescent Current into OUT
1
1.5
RATIO
Off-Time Tracking Ratio (Note 3)
mV/°C
-2
Start-Up Voltage Tempco
V
0.88
V
0.7
V
BATT(MIN)
Minimum Operating Input Voltage
Start-Up Voltage (Note 2)
V-µs
17
25
35
K
On-Time Constant
V
0.8
P-Channel Catch-Diode Voltage
Ω
1.5
2.2
P-Channel On-Resistance
V
3.16
3.30
3.44
V
OUT
Output Voltage
V
2.0
5.2
Output Voltage Range
V
1.18
1.225
1.27
V
FB
FB Set Voltage
Ω
1
1.5
N-Channel On-Resistance
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
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.)
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.
V
1.65
Maximum Operating Input Voltage
Falling PFI, hysteresis = 1%
mV
590
614
632
PFI Trip Voltage
V
PFI
= 0V, V
OUT
= 3.3V, I
SINK
= 1mA
V
PFI
= 650mV
V
0.4
V
OL
PFO, BATTLO Low Output Voltage
nA
10
PFI Input Current
V
OUT
= 3.3V, hysteresis = 2% (MAX1643)
V
PFI
= 650mV, V
PFO
= 6V
V
0.96
1.0
1.04
BATTLO Trip Voltage
µA
1
PFO, BATTLO Leakage Current
% of V
BATT
(MAX1642)
% of V
BATT
(MAX1642)
%
80
V
IH
SHDN Input High Voltage
%
20
V
IL
SHDN Input Low Voltage
(MAX1642)
nA
10
SHDN Input Current