LTC4009-2_15 Datasheet, PDF (5/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger

Test Circuits
LTC4009
FROM ICL
(CLP = CLN)
1.2085V
–
–
–
EA
+
PROG V_FB
13
10
1.2085V
TARGET
LTC1055
ITH
12
0.6V
4009 TC01
LTC4009
LTC4009-1/LTC4009-2
LTC4009-1
LTC4009-2
FROM ICL
(CLP = CLN)
1.2085V
–
–
–
EA
+
PROG BAT
13
11
TARGET VARIES
WITH FVS0,1
LTC1055
ITH
12
0.6V
4009 TC02
Typical Performance Characteristics
(T_A = 25°C unless otherwise noted. D_IN = SSB44, L = IHLP-2525 6.8µH)
Efficiency at DCIN = 20V, BAT = 8V
100
R_SENSE = 33mΩ
R_IN = 3.01k
10000
95
POWER LOSS
90
1000
EFFICIENCY
85
Efficiency at DCIN = 20V, BAT = 12V
100
R_SENSE = 33mΩ
R_IN = 3.01k
10000
95
POWER LOSS
EFFICIENCY
90
1000
85
80
0
0.5 1.0 1.5 2.0 2.5
CHARGE CURRENT (A)
100
3.0
4009 G01
80
0
0.5 1.0 1.5 2.0 2.5
CHARGE CURRENT (A)
100
3.0
4009 G02
Efficiency at DCIN = 20V, BAT = 16V
100
R_SENSE = 33mΩ
R_IN = 3.01k
10000
95
EFFICIENCY
POWER LOSS
90
1000
85
80
0
0.5 1.0 1.5 2.0 2.5
CHARGE CURRENT (A)
100
3.0
4009 G03
V_FB Line Regulation
0.10
LTC4009 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
CLP (V)
25
30
4009 G04
FBDIV R_ON vs BAT
300
275
CLP = BAT + 3V
(CLP ≥ 6V)
250
225
200
175
150
125
100
75
0
5
10
15
20
25
BAT (V)
4009 G05
4009fd