Datasheet

2
LTC4050
4050f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Supply Voltage ● 4.5 10 V
I
CC
Input Supply Current Charger On, Current Mode ● 1.3 3 mA
Shutdown Mode
● 1.3 3 mA
Sleep Mode (Battery Drain Current) 5 15 µA
V
BAT
Regulated Output (Float) Voltage in LTC4050-4.1; 5V ≤ V
CC
≤ 10V, 0°C ≤ T
A
≤ 85°C 4.059 4.1 4.141 V
Constant Voltage Mode LTC4050-4.2; 5V ≤ V
CC
≤ 10V, 0°C ≤ T
A
≤ 85°C 4.158 4.2 4.242 V
LTC4050-4.1; 5V ≤ V
CC
≤ 10V ● 4.039 4.1 4.141 V
LTC4050-4.2; 5V ≤ V
CC
≤ 10V ● 4.137 4.2 4.242 V
I
BAT
Current Mode Charge Current R
PROG
= 19.6k, R
SENSE
= 0.2Ω 440 500 535 mA
R
PROG
= 19.6k, R
SENSE
= 0.2Ω ● 415 585 mA
R
PROG
= 97.6k, R
SENSE
= 0.2Ω 60 100 140 mA
I
TRIKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 19.6k, I
TRIKL
= (V
CC
– V
SENSE
)/0.2Ω ● 20 55 90 mA
V
TRIKL
Trickle Charge Threshold Voltage ● 2.41 2.49 2.58 V
V
UV
V
CC
Undervoltage Lockout Voltage ● 44.5 V
∆V
UV
V
CC
Undervoltage Lockout Hysteresis 130 mV
V
MSD
PROG Pin Manual Shutdown 3.6 V
Threshold Voltage
V
ASD
Automatic Shutdown Threshold Voltage (V
CC
– V
BAT
) High to Low 25 54 85 mV
(V
CC
– V
BAT
) Low to High 40 69 100 mV
I
PROG
PROG Pin Current Internal Pull-Up Current, No R
PROG
2.3 µA
PROG Pin Source Current, ∆V
PROG
≤ 5mV ● 300 µA
V
PROG
PROG Pin Voltage R
PROG
=19.6k 2.47 V
V
ACPR
ACPR Pin Output Low Voltage I
ACPR
= 5mA 0.525 V
I
CHRG
CHRG Pin Weak Pull-Down Current V
CHRG
= 1V 32 µA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 0.525 V
R
HOT
Thermistor Resistance for Hot Fault 3.7 4.1 4.4 kΩ
R
COLD
Thermistor Resistance for Cold Fault 25 28.5 31 kΩ
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage (V
CC
) ...................................... 12V
SENSE, DRV, BAT, SEL,
TIMER, PROG, CHRG, ACPR .................–0.3V to 12V
Operating Temperature Range (Note 2) . –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LTC4050EMS-4.1
LTC4050EMS-4.2
T
JMAX
= 140°C, θ
JA
= 180°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
MS PART MARKING
LTTW
LTTX
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 6V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
1
2
3
4
5
BAT
NTC
CHRG
TIMER
GND
10
9
8
7
6
ACPR
SENSE
V
CC
DRV
PROG
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