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| LTC3554 Datasheet, PDF (10/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators | |||
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LTC3554
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise speciï¬ed.
Step-Down Switching
Regulator Output Transient
(FSEL Low to High)
Step-Down Switching
Regulator Output Transient
(STBY High to Low)
VOUT1
50mV/DIV
(AC)
VOUT2
20mV/DIV
(AC)
FSEL
VOUT1 = 3.3V
IOUT1 = 100mA
VOUT2 = 1.2V
IOUT2 = 50mA
50μs/DIV
VOUT1
20mV/DIV
(AC)
VOUT2
20mV/DIV
(AC)
STBY
3554 G29
VOUT1 = 3.3V
IOUT1 = 5mA
VOUT2 = 1.2V
IOUT2 = 5mA
50μs/DIV
3554 G30
Step-Down Switching Regulator
Dropout Voltage in Standby Mode
vs Load Current
200
VBVIN + 2.9V
180
â45°C
160
25°C
90°C
140
120
100
80
60
40
20
0
0 2 4 6 8 10 12 14
LOAD CURRENT (mA)
3554 G23
3554p
10
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