LTC4012-2_15 Datasheet, PDF (6/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

LTC4012/
LTC4012-1/LTC4012-2
Typical Performance Characteristics
(T_A = 25°C unless otherwise noted. L = IHLP-2525 6.8µH)
Efficiency at DCIN = 20V, BAT = 8V
100
R_SENSE = 33mΩ
R_IN = 3.01k
10000
95
EFFICIENCY
90
POWER LOSS
1000
Efficiency at DCIN = 20V, BAT = 12V
100
R_SENSE = 33mΩ
R_IN = 3.01k
10000
95
EFFICIENCY
90
POWER LOSS
1000
85
85
80
0
0.5 1 1.5 2
CHARGE CURRENT (A)
100
2.5 3
4012 G01
80
0
0.5 1 1.5 2
CHARGE CURRENT (A)
100
2.5 3
4012 G02
Efficiency at DCIN = 20V, BAT = 16V
100
10000
EFFICIENCY
95
90
1000
POWER LOSS
85
80
0
R_SENSE = 33mΩ
R_IN = 3.01k
100
0.5 1 1.5 2 2.5 3
CHARGE CURRENT (A)
4012 G03
V_FB Line Regulation
0.10
LTC4012 TEST CIRCUIT
0.08
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
5
10
15
20
25
30
CLP PIN VOLTAGE (V)
4012 G04
FBDIV Pin R_ON vs Battery Voltage
300
CLP = BAT + 3V
275
(CLP ≥ 6V)
250
225
200
175
150
125
100
75
0
5
10
15
20
25
BATTERY VOLTAGE (V)
4012 G05
Battery Load Dump
2A
12.1V
1A
1A
3A
LOAD
STATE
RECONNECT
DISCONNECT
TIME (1ms/DIV)
4012 G06
CLP = 20V
V_OUT = 12.3V

Charge Current Accuracy
2
1
0
–1
DCIN = 24V
R_PROG = 35.7k
–2
DCIN = 12V
R_PROG = 26.7k
–3
–4
–5
R_SENSE = 33mΩ
R_IN = 3.01k
–6
0 2 4 6 8 10 12 14 16 18 20 22 24
BATTERY VOLTAGE (V)
4012 G07
4012fa