LTC3552 Datasheet, PDF (3/24 Pages) Linear Technology – Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter

LTC3552
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 5V, V_CC = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
V⎯_E⎯_N(IL)
V⎯_E⎯_N(IH)
R⎯_E⎯_N
V_ASD
I_TERM
V_PROG
V⎯_C⎯_H⎯_R⎯_G
V⎯_P⎯_W⎯_R
ΔV_RECHRG
T_LIM
⎯E⎯N Pin Input Low Voltage
⎯E⎯N Pin Input High Voltage
⎯EN Pin Pull-Down Resistor
V_IN – V_BAT Lockout Threshold Voltage
Charge Termination Current Threshold
PROG Pin Voltage
⎯C⎯H⎯R⎯G Pin Output Low Voltage
⎯P⎯W⎯R Pin Output Low Voltage
Recharge Battery Threshold Voltage
Junction Temperature in Constant-
Temperature Mode
V_IN from Low to High
V_IN from High to Low
R_TERM = 1k
R_TERM = 5k
R_PROG = 10k, Current Mode
I⎯_C⎯_H⎯_R⎯_G = 5mA
I⎯_P⎯_W⎯_R = 5mA
V_FLOAT – V_RECHRG, 0°C < T_A < 85°C
● 0.4
0.7
●
0.7
1
● 1.2
2
5
70
100 140
5
30
50
● 90
100 110
● 17.5
20
22.5
0.93
1
1.07
0.35 0.6
0.35 0.6
60
100 140
120
R_ON-CHRG
t_SS-CHRG
t_RECHRG
t_TERM
Charger’s Power FET On-Resistance
(Between V_IN and BAT)
Charger Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
I_BAT = 0 to I_BAT = 1000V/R_PROG
V_BAT High to Low
I_BAT Drops Below Charge Termination
Threshold
600
100
0.75
2
4.5
0.4
1
2.5
Switching Regulator
V_CC
I_FB
V_FB
ΔV_{LINE_REG}
ΔV_{LOAD_REG}
I_S
f_OSC
f_SYNC
I_LIM
R_DS(ON)
Operating Voltage Range for Regulator
● 2.5
5.5
Feedback Pin Input Current
●
30
Feedback Voltage (Note 5)
Reference Voltage Line Regulation
Output Voltage Load Regulation
0°C ≤ T_A ≤ 85°C
–40°C ≤ T_A ≤ 85°C
V_CC = 2.5V to 5.5V (Note 5)
(Note 5)
0.588 0.6 0.612
● 0.585 0.6 0.612
0.3
0.5
0.5
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronization Frequency
V_FB1 = V_FB2 = 0.5V
V_FB1 = V_FB2 = 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V_CC = 5.5V, MODE/SYNC = 0V
700 950
40
60
0.1
1
V_FB = 0.6V
● 1.8
2.25
2.7
2.25
Peak Switch Current Limit Regulator 1
Peak Switch Current Limit Regulator 2
Top Switch On-Resistance
Bottom Switch On-Resistance
V_CC = 3V, V_FB = 0.5V, Duty Cycle < 35%
V_CC = 3V, V_FB = 0.5V, Duty Cycle < 35%
(Note 6)
(Note 6)
0.95 1.2
1.6
0.6
0.7
0.9
0.35 0.45
0.30 0.45
I_SW(LKG)
POR
Switch Leakage Current
Power-On Reset Threshold
Power-On Reset On-Resistance
V_CC = 5V, V_RUN = 0V, V_FB = 0V
V_FB Ramping Down, MODE/SYNC = 0V
0.01
1
–8.5
100 200
Power-On Reset Delay
262,144
V_RUN
I_RUN
RUN Threshold Voltage
RUN Leakage Current
● 0.3
1
1.5
●
0.01
1
UNITS
V
V
MΩ
mV
mV
mA
mA
V
V
V
mV
°C
mΩ
µs
ms
ms
V
nA
V
V
%/V
%
µA
µA
µA
MHz
MHz
A
A
Ω
Ω
µA
%
Ω
Cycles
V
µA
3552f
3