LTC4007_1 Datasheet, PDF (5/24 Pages) Linear Technology – 4A, High Efficiency, Standalone Li-Ion Battery Charger

TYPICAL PERFOR A CE CHARACTERISTICS
LTC4007
INFET Response Time to
Reverse Current
V_gs = 0
V_gs OF PFET (2V/DIV)
V_s OF PFET (5V/DIV)
V_s = 0V
I_d (REVERSE) OF
PFET (5A/DIV)
I_d = 0A
1.25µs/DIV
TEST PERFORMED ON DEMOBOARD
V_IN = 15VDC
CHARGER = ON
V_CHARGE = 12.6V
PFET = 1/2 Si4925DY
I_CHARGE = <10mA
4007 G01
PWM Frequency vs Duty Cycle
350
300
250
200
Line Regulation
0.10
0.05
0
–0.05
–0.10
C3C4 = OPEN
–0.15
–0.20
–0.25
C3C4 = GND
–0.30
–0.35
–0.40
–0.45
13 15 17 19 21 23 25 27 29 31
VDCIN (V)
4007 G02
Disconnect/Reconnect Battery
(Load Dump)
V_FLOAT
1V/DIV
3A STEP
1A STEP
1A STEP
V_OUT vs I_OUT
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
0
3C4C = GND
3C4C = OPEN
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT (A)
4007 G03
1A Load Step (Battery Present)
CHARGER CURRENT (1A/DIV)
150
PROGRAMMED CURRENT = 10%
100
50
DCIN = 15V
DCIN = 20V
0
DCIN = 24V
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DUTY CYCLE (V_OUT/V_IN)
4007 G04
LOAD
STATE
3A STEP
DISCONNECT
RECONNECT
LOAD CURRENT = 1A, 2A, 3A
DCIN = 20V
V_FLOAT = 12.6V (3C4C = GND, CHEM = OPEN)
4007 G05
OUTPUT VOLTAGE (500mV/DIV)
DCIN = 20V
V_FLOAT = 12.6V
1A Load Step
(Battery Not Present)
Battery Leakage Current vs
Battery Voltage
40
VDCIN = 0V
35
30
25
CHARGER CURRENT (500mA/DIV)
20
15
OUTPUT VOLTAGE (5V/DIV)
10
5
DCIN = 20V
V_FLOAT = 12.6V
4007 G07
0
0
5 10 15 20 25 30
BATTERY VOLTAGE (V)
4007 G08
4007 G06
4007fa
5