LTC3553 Linear Technology Corporation, LTC3553 Datasheet - Page 9

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

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TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode is a registered trademark of Linear Technology Corporation.
100
460
420
400
100
500
480
440
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0.01
0.01
0
0
–75 –50 –25
Buck Regulator 1.2V Output
Effi ciency vs I
Buck Regulator 3.3V Output
Effi ciency vs Load
Buck Regulator Short-Circuit
Current vs Temperature
STBY = L
STBY = L
STBY = L
0.1
0.1
TEMPERATURE (°C)
BUCK LOAD (mA)
BUCK LOAD (mA)
0
1
1
LOAD
25
50
10
10
75 100
100
100
125
3.8V
5V
3553 G22
3.8V
5V
3553 G19
3553 G25
1000
1000
150
BUCK (1.2V)
I
BUCK
50mV/DIV
10mV/DIV
100μA
V
(AC)
(AC)
5mA
100
OUT
15
35
30
25
20
10
30
20
10
90
80
70
60
50
40
5
0
0
0.01
2.5
Buck Regulator Output Transient
(STBY = High)
Buck Switching Regulator 2.5V
Output Effi ciency vs Load
Buck Regulator Burst Mode
Operation BVIN Supply Current
V
V
STBY = HIGH
NO LOAD
STBY = L
BUS
BAT
STBY = L
= 3.8V
= 0V
3
0.1
BVIN SUPPLY VOLTAGE (V)
3.5
BUCK LOAD (mA)
1
50μs/DIV
4
10
4.5
100
®
5
–45°C
25°C
90°C
3.8V
5V
3553 G23
3553 G26
3553 G20
T
A
1000
5.5
= 25°C, unless otherwise specifi ed.
BUCK (1.2V)
I
BUCK
50mV/DIV
50mV/DIV
100mA
V
1mA
(AC)
(AC)
100
1.5
0.5
OUT
3.0
2.5
2.0
1.0
30
20
10
90
80
70
60
50
40
0
0
0.01
2.5
Buck Switching Regulator 1.8V
Output Effi ciency vs Load
Buck Regulator Standby Mode
BVIN Supply Current
Buck Regulator Output Transient
(STBY = Low)
V
V
STBY = LOW
NO LOAD
STBY = H
STBY = L
BUS
BAT
= 3.8V
= 0V
3
0.1
BVIN SUPPLY VOLTAGE (V)
3.5
BUCK LOAD (mA)
1
100μs/DIV
LTC3553
4
10
4.5
100
5
–45°C
25°C
90°C
3.8V
5V
3553 G24
3553 G21
3553 G27
9
3553f
1000
5.5