LTC4006_15 Datasheet, PDF (4/20 Pages) Linear Technology – 4A, High Efficiency, Standalone Li-Ion Battery Charger

LTC4006
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range (Note 4), otherwise specifications are at T_A = 25°C. V_DCIN = 20V, V_BAT = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Oscillator
f_OSC
Regulator Switching Frequency
f_MIN
Regulator Switching Frequency in Drop Out
DC_MAX Regulator Maximum Duty Cycle
Gate Drivers (TGATE, BGATE)
Duty Cycle ≥ 98%
V_CSP = V_BAT
255
300
345
kHz
20
25
kHz
98
99
%
TGTR
TGTF
BGTR
BGTF
V_TGATE High (V_CLN – V_TGATE)
V_BGATE High
V_TGATE Low (V_CLN – V_TGATE)
V_BGATE Low
TGATE Transition Time
TGATE Rise Time
TGATE Fall Time
BGATE Transition Time
BGATE Rise Time
BGATE Fall Time
V_TGATE at Shutdown (V_CLN – V_TGATE)
V_BGATE at Shutdown
I_TGATE = –1mA
C_LOAD = 3000pF
C_LOAD = 3000pF
I_BGATE = 1mA
C_LOAD = 3000pF, 10% to 90%
C_LOAD = 3000pF, 10% to 90%
C_LOAD = 3000pF, 10% to 90%
C_LOAD = 3000pF, 10% to 90%
I_TGATE = –1µA, DCIN = 0V, CLN = 12V
I_BGATE = 1µA, DCIN = 0V, CLN = 12V
50
mV
4.5
5.6
10
V
4.5
5.6
10
V
50
mV
50
110
ns
50
100
ns
40
90
ns
40
80
ns
100
mV
100
mV
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: See Test Circuit
Note 3: Does not include tolerance of current sense resistor.
Note 4: The LTC4006E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
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
LTC4006-2
INFET = 1/2 Si4925DY
I_CHARGE = <10mA
4006 G01
V_OUT vs I_OUT
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5 ^{DCIN = 20V}
V_BAT = 12.6V
–5.0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT (A)
4006 G02
PWM Frequency vs Duty Cycle
350
300
250
200
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)
4006 G03
4006fa
4