Reset, Electrical characteristics (continued) – Rainbow Electronics MAX1947 User Manual
Page 3
MAX1947
Low Input/Output Voltage
Step-Up DC-DC Converter with
RESET
_______________________________________________________________________________________
3
Note 2: Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3: When BATT is greater than the output-voltage set point, the part is in track mode (see the Track Mode section).
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 1.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Startup to Normal-Mode Output
Transition Voltage
50mV hysteresis, rising edge
1.40
1.62
1.73
V
T
A
= 0°C to +85°C
600
800
1000
NFET Current Limit
T
A
= -40°C to +85°C
580
800
1000
mA
T
A
= 0°C to +85°C
15
75
150
PFET Turn-Off Current
T
A
= -40°C to +85°C
10
75
150
mA
MAX1947ETA18
0.3
0.6
MAX1947ETA25
0.22
0.44
MAX1947ETA30
0.17
0.34
Internal NFET
On-Resistance
I
LX
= 100mA
MAX1947ETA33
0.15
0.3
Ω
MAX1947ETA18
0.5
1.0
MAX1947ETA25
0.35
0.7
MAX1947ETA30
0.28
0.56
Internal PFET
On-Resistance
I
LX
= 100mA
MAX1947ETA33
0.25
0.5
Ω
T
A
= +25°C
0.1
1
LX Leakage Current
SHDN = GND, V
OUT
= 0V,
V
LX
= 3.6V
T
A
= +85°C
1
µA
SHUTDOWN MODE
Shutdown Supply Current
SHDN = GND
2
4
µA
V
IH
0.8 x
V
BATT
SHDN Input Voltage
V
IL
0.18 x
V
BATT
V
SHDN = OUT or GND, T
A
= +25
°
C
1
100
SHDN Input Bias Current
SHDN = OUT or GND, T
A
= +85
°
C
5
nA
OUT Discharge Resistance in
Shutdown
SHDN = GND
500
1000
Ω
RESET
OUTPUT
Reset OUT Voltage Trip Level
V
OUT
falling, 1% hysteresis
87
90
93
%
Minimum V
OUT
for Valid Reset
0.9
V
Reset Timeout
65
140
235
ms
I
SINK
= 200µA
0.3
RESET Output Voltage
I
SOURCE
= 200µA
0.8 x V
OUT
V