LTC3553_15 Datasheet, PDF (11/36 Pages) Linear Technology – Micropower USB Power Manager With Li-Ion Charger, LDO and Buck Regulator

LTC3553
Typical Performance Characteristics T_A = 25°C, unless otherwise specified.
LDO Dropout Voltage at
V_INLDO = 3.8V
300
–45°C
25°C
250
90°C
200
LDO Dropout Voltage at
V_INLDO = 2.5V
300
–45°C
25°C
250
90°C
200
LDO Dropout Voltage at
V_INLDO = 1.8V
300
–45°C
25°C
250
90°C
200
150
150
150
100
100
100
50
50
50
0
0 25 50 75 100 125 150
LDO LOAD (mA)
3553 G37
0
0 25 50 75 100 125 150
LDO LOAD (mA)
3553 G38
0
0
15
30
45
60
75
LDO LOAD (mA)
3553 G39
LDO Output Transient
(STBY = Low)
LDO Output Transient
(STBY = High)
LDO Rejection of Buck
Output Ripple
V_OUT
50mV/DIV
(AC)
LDO (3.3V)
50mV/DIV
(AC)
100mA
I_LDO
1mA
V_BUS = 0V
V_BAT = 3.8V
STBY = LOW
50µs/DIV
V_OUT
50mV/DIV
(AC)
LDO (3.3V)
100mV/DIV
(AC)
3553 G40
100mA
I_LDO
1mA
V_BUS = 0V
V_BAT = 3.8V
STBY = HIGH
50µs/DIV
BUCK OUTPUT
1.8V
10mV/DIV (AC)
LDO OUTPUT
1.2V
10mV/DIV (AC)
3553 G41
10µs/DIV
BUCK OUTPUT CONNECTED TO V_INLDO
5mA LDO LOAD
4.7µF LDO OUTPUT CAPACITOR
V_BAT = 3.8V, V_BUS = 0V
3553 G42
3553fc
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