LTC4056-4.2_15 Datasheet, PDF (3/16 Pages) Linear Technology – Linear Li-Ion Charger with Termination in ThinSOT

LTC4056-4.2
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 5V.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
∆V_RECHRG
Recharge Threshold Voltage
V_FLOAT – V_RECHRG, V_BAT > V_TRIKL,
Charge Termination Timer Expired
100 150 200
mV
T_TIMER
TIMER/SHDN Accuracy
Charger Manual Control
C_TIMER = 1µF R_PROG = 1.43k
q
10
12
%
V_MSDT
V_MSHYS
I_SHDN
Protection
Manual Shutdown Threshold Voltage
Manual Shutdown Hysteresis Voltage
TIMER/SHDN Pin Pull-up Current
V_TIMER/SHDN Increasing
V_TIMER/SHDN Decreasing
V_TIMER/SHDN = 0V
q 0.6
0.82
1
V
50
75
125
mV
– 10
–7
–4
µA
I_DSHRT
I_PSHRT
Status Output
Drive Output Short-Circuit Current Limit
PROG Pin Short-Circuit Current Limit
V_DRIVE = V_CC
V_PROG = 0V
q 30
65
130
mA
1.4
mA
I_CHRG
V_CHRG
CHRG Pin Weak Pull-Down Current
CHRG Output Low Voltage
V_CHRG = 1V, V_TIMER/SHDN = 0V
I_CHRG = 10mA
6
12
18
µA
q
0.2
0.4
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC4056E is guaranteed to meet performance specifications
from 0°C to 70°C ambient 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: Although the LTC4056 will operate with input voltages as low as
4.5V, charging will not begin until V_CC exceeds V_UVCL.
Note 4: 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 5: 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).
TYPICAL PERFOR A CE CHARACTERISTICS
Float Voltage vs Temperature and
Supply Voltage
4.215
4.210
I_BAT = 10mA
PNP = FZT749
4.205
4.200
4.195
V_CC = 6.5V
V_CC = 4.75V
4.190
4.185
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4056-4.2 G01
Float Voltage vs I_BAT
4.202
4.201
V_CC = 5V
T_A = 25°C
PNP = FZT749
R_PROG = 1.30k
4.200
4.199
4.198
0 100 200 300 400 500 600 700
I_BAT (mA)
4056-4.2 G02
I_BAT vs Temperature and
Supply Voltage
220
R_PROG = 4.53k
215 ^{PNP = FZT749}
210
205
V_CC = 6.5V
200
V_CC = 4.75V
195
190
185
180
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
4056-4.2 G03
405642f
3