LTC3553-2_15 Datasheet, PDF (4/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

LTC3553-2
POWER MANAGER ELECTRICAL CHARACTERISTICS
The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at T_A = 25°C (Note 2),
V_BUS = 5V, V_BAT = 3.8V, HPWR = SUSP = BUCK_ON = 0V, R_PROG = 1.87k, STBY = high, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Ideal Diode
V_FWD
Forward Voltage Detection
R_DROPOUT Diode On-Resistance, Dropout
I_MAX
Diode Current Limit
Logic Inputs (HPWR, SUSP)
(Note 12)
I_OUT = 200mA, V_BUS = 0V
(Note 7)
15
mV
240
mΩ
1
A
V_IL
Input Low Voltage
V_IH
Input High Voltage
R_PD
Internal Pull-Down Resistance
Logic Output (CHRG)
0.4
V
1.2
V
4
MΩ
V_OL
I_CHRG
Output Low Voltage
Output Hi-Z Leakage Current
I_CHRG = 5mA
V_BAT = 4.5V, V_CHRG = 5V
65
250
mV
0
1
μA
BUCK REGULATOR ELECTRICAL CHARACTERISTICS
The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at T_A = 25°C (Note 2).
BUCK_ON = V_OUT = BVIN = 3.8V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
BVIN
Input Supply Voltage
(Note 9)
l 2.7
5.5
V
V_OUT UVLO V_OUT Undervoltage Lockout
f_OSC
Oscillator Frequency
I_{BUCK_FB} BUCK_FB Input Current (Note 8)
R_{SW_PD} SW Pull-Down in Shutdown
Logic Input Pin (STBY)
V_OUT Falling
V_OUT Rising
BUCK_ON = 0V
2.5
2.6
V
2.8
2.9
V
0.955 1.125 1.295
MHz
–0.05
0.05
μA
10
kΩ
Input High Voltage
1.2
V
Input Low Voltage
0.4
V
Input Current
–1
1
μA
Buck Regulator in Normal Operation (STBY Low)
I_LIM
Peak PMOS Current Limit
V_{BUCK_FB} Regulated Feedback Voltage
D_MAX
Max Duty Cycle
R_P
R_DS(ON) of PMOS
R_N
R_DS(ON) of NMOS
Buck Regulator in Standby Mode (STBY High)
BUCK_ON = 3.8V (Note 7)
BUCK_ON = 3.8V
I_SW = 100mA
I_SW = –100mA
300
500
650
mA
l 780
800
820
mV
100
%
1.1
Ω
0.7
Ω
Feedback Voltage Threshold
Short-Circuit Current
BUCK_ON = 3.8V, V_{BUCK_FB} Falling
l 770
800
820
mV
30
50
100
mA
Standby Mode Dropout Voltage
BUCK_ON = 2.9V, I_SW = 10mA, V_{BUCK_FB} = 0.76V,
V_OUT = 2.9V, BVIN = 2.9V
50
100
mV
35532f
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