Datasheet

3
LTC1734
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, GND = 0V and V
BAT
is equal to the float voltage unless
otherwise noted. All current into a pin is positive and current out of a pin is negative. All voltages are referenced to GND, unless
otherwise specified.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Charger Manual Control
V
MSDT
Manual Shutdown Threshold V
PROG
Increasing ● 2.05 2.15 2.25 V
V
MSHYS
Manual Shutdown Hysteresis V
PROG
Decreasing from V
MSDT
90 mV
I
PROGPU
Programming Pin Pull-Up Current V
PROG
= 2.5V –6 –3 –1.5 µA
Protection
I
DSHRT
Drive Output Short-Circuit Current Limit V
DRIVE
= V
CC
● 35 65 130 mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1734E is guaranteed to meet performance specifications
from 0°C to 70°C ambient temperature range and 0°C to 100°C junction
temperature range. Specifications over the –40°C to 85°C operating
ambient temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Assumes that the external PNP pass transistor has negligible B-C
reverse-leakage current when the collector is biased at 4.2V (V
BAT
) and the
base is biased at 5V (V
CC
).
Note 4: Assumes that the external PNP pass transistor has negligible B-E
reverse-leakage current when the emitter is biased at 0V (V
CC
) and the
base is biased at 4.2V (V
BAT
).
Note 5: The 4.68V maximum undervoltage lockout (UVLO) exit threshold
must first be exceeded before the minimum V
CC
specification applies.
Short duration drops below the minimum V
CC
specification of several
microseconds or less are ignored by the UVLO. If manual shutdown is
entered, then V
CC
must be higher than the 4.68V maximum UVLO
threshold before manual shutdown can be exited. When operating near the
minimum V
CC
, a suitable PNP transistor with a low saturation voltage
must be used.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Float Voltage vs Temperature
and Supply Voltage
TEMPERATURE (°C)
–50
4.19
FLOAT VOLTAGE (V)
4.20
4.21
0
50
75
1734 G01
–25
25
100
125
I
BAT
= 10mA
PNP = FCX589
4.2V OPTION
V
CC
= 8V
V
CC
= 4.55V
I
BAT
(mA)
0
4.199
FLOAT VOLTAGE (V)
4.200
4.201
200
400
500
1734 G02
100
300
600
700
V
CC
= 5V
T
A
= 25°C
PNP = FCX589
4.2V OPTION
R
PROG
= 2150Ω
TEMPERATURE (°C)
–50
190
I
BAT1
(mA)
200
210
0
50
75
1734 G03
–25
25
100
125
R
PROG
= 7.5k
PNP = FCX589
V
CC
= 4.55V AND 8V
Float Voltage vs I
BAT
I
BAT1
vs Temperature
and Supply Voltage