Datasheet

LTC4425
5
4425fa
For more information www.linear.com/LTC4425
Typical perForMance characTerisTics
Charge Current
vs (V
IN
–V
OUT
) Differential
PROG Pin Voltage
vs (V
IN
– V
OUT
) Differential
V
IN
Quiescent Current
vs Temperature (V
IN
≥ V
OUT
)
Charge Current
vs Junction Temperature
Charge Current
vs V
OUT
in Thermal Regulation
V
OUT
Quiescent Current
vs Temperature (V
IN
< V
OUT
)
LDO Regulation Voltage
vs Charge Current
LDO Regulation Voltage
vs Temperature
Charger FET On-Resistance
vs Supply Voltage
I
CHG
(mA)
0
3.255
VOLTAGE (V)
3.290
3.285
3.280
3.275
3.270
3.265
3.260
3.295
200 1000 1200400 600 800
4425 G01
V
IN
= 3.8V
R
PROG
= 1k
V
OUT
SET FOR 3.3V
TEMPERATURE (°C)
–45
3.277
V
OUT
(V)
3.285
3.284
3.283
3.282
3.281
3.280
3.278
3.279
3.286
–30 30 45 60 75 90–15 0 15
4425 G02
V
IN
= 3.8V
V
OUT
SET FOR 3.3V
INPUT VOLTAGE (V)
2.7
0
ON-RESISTANCE (mΩ)
70
60
50
40
30
10
20
80
3 4.2 4.5 4.83.3 3.6 3.9
4425 G03
25°C
90°C
–45°C
V
IN
TO V
OUT
DIFFERENTIAL (V)
0
0
CHARGE CURRENT (mA)
1000
800
600
200
400
1200
0.1 0.5 0.6 0.7 0.8 0.9 10.2 0.3 0.4
4425 G04
NORMAL MODE
V
IN
= 3.8V
R
PROG
= 1k
LDO MODE (FB GROUNDED)
V
IN
TO V
OUT
DIFFERENTIAL (V)
0
0
PROG VOLTAGE (mV)
1000
800
400
200
600
1200
0.1 0.5 0.6 0.7 0.8 0.9 10.2 0.3 0.4
4425 G05
V
IN
= 3.8V
R
PROG
= 1k
NORMAL MODE
LDO MODE (FB GROUNDED)
TEMPERATURE (°C)
–45
0
CURRENT (µA)
20
15
5
10
25
–25 55 75 90–5 15 35
4425 G06
V
IN
= 3.8V
V
IN
= 2.7V
TEMPERATURE (°C)
–45
0
CHARGE CURRENT (mA)
800
1000
600
200
400
1200
–30 30 45 60 75 90 105 120–15 0 15
4425 G07
V
IN
= 3.8V
R
PROG
= 1k, FB GROUNDED
OUTPUT VOLTAGE (V)
0
0
CHARGE CURRENT (mA)
2000
2500
1500
500
1000
3000
0.5 2.5 3 3.5 4 4.51 1.5 2
4425 G08
THERMAL REGULATION
ON-CHIP POWER DISSIPATION ~4W
CASE TEMP ~100°C
V
IN
= 5V
FB, PROG PINS SHORTED TO GND
AMBIENT TEMP 25°C
TEMPERATURE (°C)
–45
0
CURRENT (µA)
8
10
12
14
16
18
6
2
4
20
–25 55 75 90–5 15 35
4425 G09
V
OUT
= 3.8V
V
OUT
= 2.7V
T
A
= 25°C, unless otherwise noted.
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