LTC3553 Linear Technology Corporation, LTC3553 Datasheet - Page 11

• Manufacturer Part Number: LTC3553
• Description: Micropower USB Power Manager
• Manufacturer: Linear Technology Corporation

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LDO (3.3V)
TYPICAL PERFORMANCE CHARACTERISTICS
50mV/DIV
50mV/DIV
I
LDO
100mA
V
1mA
(AC)
(AC)
300
250
200
150
100
OUT
50
0
0
LDO Output Transient
(STBY = Low)
LDO Dropout Voltage at
V
V
V
STBY = LOW
BUS
BAT
INLDO
= 3.8V
= 0V
25
–45°C
25°C
90°C
= 3.8V
50
LDO LOAD (mA)
50μs/DIV
75
100
125
3553 G37
3553 G40
150
100mV/DIV
LDO (3.3V)
50mV/DIV
I
LDO
100mA
V
1mA
(AC)
(AC)
300
250
200
150
100
OUT
50
0
0
LDO Dropout Voltage at
V
LDO Output Transient
(STBY = High)
V
V
STBY = HIGH
BUS
BAT
INLDO
= 3.8V
= 0V
25
–45°C
25°C
90°C
= 2.5V
50
LDO LOAD (mA)
50μs/DIV
75
100
125
3553 G38
3553 G41
T
A
150
= 25°C, unless otherwise specifi ed.
10mV/DIV (AC)
10mV/DIV (AC)
BUCK OUTPUT
LDO OUTPUT
1.8V
1.2V
150
300
250
200
100
50
0
0
LDO Dropout Voltage at
V
LDO Rejection of Buck
Output Ripple
BUCK OUTPUT CONNECTED TO V
5mA LDO LOAD
4.7μF LDO OUTPUT CAPACITOR
V
BAT
INLDO
= 3.8V, V
15
–45°C
25°C
90°C
= 1.8V
BUS
LDO LOAD (mA)
30
= 0V
10μs/DIV
LTC3553
45
INLDO
11
60
3553 G42
3553f
3553 G39
75