LTC3553 Linear Technology Corporation, LTC3553 Datasheet - Page 10

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

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20mV/DIV (AC)
50mV/DIV (AC)
BUCK OUTPUT
1.2V AT 10mA
3.3V AT 10mA
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3553
LDO OUTPUT
10
795
785
780
820
815
810
805
800
790
0.6
0.2
STBY
1.6
1.4
1.2
1.0
0.8
0.4
0
–75 –50 –25
HIGH
–50 –30 –10
LOW
Regulated LDO Feedback Voltage
vs Temperature
Buck Regulator Switch
Impedance vs Temperature
BVIN = 3.2V
STBY = L
100μA LDO LOAD
Regulator Output Transient
During STBY Transition
V
V
BUS
BAT
= 3.8V
= 0V
V
V
V
INLDO
INLDO
INLDO
TEMPERATURE (°C)
TEMPERATURE (°C)
10
0
PMOS
= 2.9V
= 3.8V
= 5V
25
30
50μs/DIV
50
50
NMOS
75 100
70
90
125
110
3553 G28
3553 G34
150
130
3553 G31
0.795
0.785
0.780
0.820
0.815
0.810
0.805
0.800
0.790
799
797
796
801
800
798
200
180
160
140
120
100
80
60
40
20
0.1
0
0
LDO Load Regulation
Buck Regulator Feedback
Voltage vs Output Current
0
Buck Regulator Dropout Voltage in
Standby Mode vs Load Current
3.8V
5V
STBY = L
BVIN = 2.9V
25
5
1
OUTPUT CURRENT (mA)
–45°C
25°C
90°C
LOAD CURRENT (mA)
50
LDO LOAD (mA)
10
75
10
15
LDO IN UNITY GAIN
V
V
V
STBY = LOW
INLDO
OUT
BUS
100
20
= V
= 0V
100
= 3.8V
BAT
125
= 3.8V
25
3553 G29
3553 G35
3553 G32
T
1000
150
A
30
= 25°C, unless otherwise specifi ed.
BUCK OUTPUT
BUCK OUTPUT
LDO OUTPUT
LDO OUTPUT
0.5V/DIV
0.5V/DIV
1V/DIV
1V/DIV
150
400
350
300
250
200
100
0V
0V
50
0V
0V
0
1
Power-Up Sequencing with SEQ
Low
Power-Up Sequencing with SEQ
High
FRONT PAGE APPLICATION CIRCUIT
LDO Short-Circuit Current
FRONT PAGE APPLICATION CIRCUIT
2
100μs/DIV
V
100μs/DIV
INLDO
3
(V)
4
3553 G30
3553 G36
3553 G33
3553f
5