LTC3559-1_15 Datasheet, PDF (4/24 Pages) Linear Technology – Linear USB Battery Charger with Dual Buck Regulators

LTC3559/LTC3559-1
ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T_A = 25°C.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_FB
Feedback Voltage
I_FB
FB Input Current
FB1, FB2 = 0.82V
l 780 800 820
mV
–0.05
0.05
μA
D_MAX
R_PMOS
Maximum Duty Cycle
R_DS(ON) of PMOS
FB1, FB2 = 0V
I_SW = 150mA
100
%
0.65
Ω
R_NMOS
R_DS(ON) of NMOS
I_SW = –150mA
0.75
Ω
R_SW(PD) SW Pull-Down in Shutdown
13
kΩ
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: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
T_J = T_A + (P_D • θ_JA°C/W)
Note 3: The LTC3559/LTC3559-1 are guaranteed to meet specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4: V_CC supply current does not include current through the PROG pin
or any current delivered to the BAT pin. Total input current is equal to this
specification plus 1.00125 • I_BAT where I_BAT is the charge current.
Note 5: I_C/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6: FB high, regulator not switching.
TYPICAL PERFORMANCE CHARACTERISTICS
Suspend State Supply and BAT
Currents vs Temperature
10
9
I_VCC
8
7
6
5
V_CC = 5V
BAT = 4.2V
4 ^{SUSP = 5V}
EN1 = EN2 = 0V
3
2
I_BAT
1
0
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
3559 G01
Battery Regulation (Float)
Voltage vs Temperature
4.250
V_CC = 5V
4.225
4.200
LTC3559
4.175
4.150
4.125
4.100
LTC3559-1
4.075
4.050
–55 –35
–15 5 25 45
TEMPERATURE (°C)
65 85
3559 G02
Battery Regulation (Float) Voltage
vs Battery Charge Current,
Constant-Voltage Charging
4.205
4.200
4.195
4.190
4.185
4.180
4.175
4.170
4.165 _{VCC = 5V}
4.160 HPWR = 5V
4.155
R_PROG = 845Ω
EN1 = EN2 = 0V
4.150
0 100 200 300 400 500 600 700 800 900 1000
I_BAT (mA)
3559 G03
3559fb
4