LTC4012-2 Linear Technology Corporation, LTC4012-2 Datasheet - Page 6

• Manufacturer Part Number: LTC4012-2
• Description: Multi-Chemistry Battery Charger
• Manufacturer: Linear Technology Corporation

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LTC4012/
LTC4012-1/LTC4012-2
TYPICAL PERFORMANCE CHARACTERISTICS
(T
6
A
300
275
250
225
200
175
125
150
100
= 25°C unless otherwise noted. L = IHLP-2525 6.8μH)
75
0
FBDIV Pin R
5
100
100
BATTERY VOLTAGE (V)
95
90
85
80
95
90
85
80
Effi ciency at DCIN = 20V, BAT = 8V
0
Effi ciency at DCIN = 20V, BAT = 16V
0
ON
10
R
R
SENSE
IN
vs Battery Voltage
= 3.01k
0.5
EFFICIENCY
0.5
= 33mΩ
EFFICIENCY
15
CHARGE CURRENT (A)
CHARGE CURRENT (A)
CLP = BAT + 3V
(CLP ≥ 6V)
1
1
POWER LOSS
20
1.5
1.5
POWER LOSS
4012 G05
25
R
R
2
2
SENSE
IN
= 3.01k
2.5
= 33mΩ
2.5
STATE
LOAD
4012 G01
4012 G03
3
3
Battery Load Dump
12.1V
CLP = 20V
V
10000
1000
100
10000
1000
100
OUT
= 12.3V
DISCONNECT
2A
1A
TIME (1ms/DIV)
3A
1A
RECONNECT
–0.02
–0.04
–0.06
–0.08
–0.10
0.10
0.08
0.06
0.04
0.02
100
95
90
85
80
0
5
Effi ciency at DCIN = 20V, BAT = 12V
0
V
LTC4012 TEST CIRCUIT
FB
4012 G06
R
R
SENSE
IN
Line Regulation
= 3.01k
0.5
10
= 33mΩ
CHARGE CURRENT (A)
CLP PIN VOLTAGE (V)
1
15
–1
–2
–3
–4
–5
–6
1.5
2
1
0
0
Charge Current Accuracy
EFFICIENCY
POWER LOSS
20
2
2
4
25
6
BATTERY VOLTAGE (V)
2.5
8
DCIN = 12V
R
4012 G02
4012 G04
PROG
10
30
3
12
= 26.7k
10000
1000
100
14
R
R
16 18
DCIN = 24V
R
SENSE
IN
PROG
= 3.01k
20
= 35.7k
= 33mΩ
4012 G07
22
4012f
24