LTC3520 Linear Technology, LTC3520 Datasheet - Page 5

• Manufacturer Part Number: LTC3520
• Description: Synchronous 1A Buck-Boost and 600mA Buck Converters
• Manufacturer: Linear Technology

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TYPICAL PERFORMANCE CHARACTERISTICS
LOAD CURRENT
500mA STEP)
210mA STEP)
BUCK V
100mV/DIV
500mA/DIV
100mV/DIV
100mA/DIV
(50mA TO
LDO V
CURRENT
(20mA TO
LOAD
100
OUT
OUT
60
90
80
70
50
40
30
20
10
0
Buck Effi ciency
Lithium-Ion to 1.8V
1
LDO Load
Transient Response
Buck Load Transient
Response (PWM Mode)
V
V
V
V
C
Burst Mode
OPERATION
IN
OUT
OUT
IN
OUT
L = SUMIDA
CDRH3D16NP-4R7N
R
BURST
= 3.6V
= 3.6V
= 1.8V
= 10µF
= 1.5V
= 249k
LOAD CURRENT (mA)
10
C
LDO INPUT VOLTAGE = 1.8V
OUT
100µs/DIV
50µs/DIV
= 4.7µF
Burst Mode
OPERATION
POWER LOSS
100
PWM MODE
V
V
IN
IN
= 4.2V
= 3V
3520 G05
3520 G07
1000
3520 G03
800
700
600
500
400
300
200
100
0
LOAD CURRENT
LOAD CURRENT
300mA STEP)
200mV/DIV
500mV/DIV
500mA/DIV
BUCK V
100mV/DIV
200mA/DIV
V
IN
(5mA TO
V
IN
= 2.2V
10000
1000
V
V
= 5V
100
OUT
OUT
OUT
10
C
L = 4.7µH
V
Switching Frequency vs R
V
V
Buck-Boost Load
Transient Response
Buck Load Transient
Response (Burst Mode Operation)
OUT
IN
IN
OUT
= 3.3V
= 3.6V
= 47µF
= 1.8V
C
R
OUT
BURST
200µs/DIV
100µs/DIV
= 22µF
100
= 249k
R
T
(k)
T
3520 G04
3520 G08
3520 G06
1000
LTC3520
5
3520f