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| LTC3520 Datasheet, PDF (5/24 Pages) Linear Technology – Synchronous 1A Buck-Boost and 600mA Buck Converters | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3520
Buck Efï¬ciency
Lithium-Ion to 1.8V
100
Burst Mode
90 OPERATION
80
70
60
50
800
700
PWM MODE
600
VIN = 4.2V 500
VIN = 3V
400
40
30
20 L = SUMIDA
10 CDRH3D16NP-4R7N
RBURST = 249k
0
1
10
Burst Mode
OPERATION
POWER LOSS
100
LOAD CURRENT (mA)
300
200
100
0
1000
3520 G03
LDO Load
Transient Response
LDO VOUT
100mV/DIV
LOAD
CURRENT
100mA/DIV
(20mA TO
210mA STEP)
VIN = 3.6V
VOUT = 1.5V
50µs/DIV
3520 G05
COUT = 4.7µF
LDO INPUT VOLTAGE = 1.8V
Switching Frequency vs RT
10000
1000
100
10
100
RT (k)
Buck-Boost Load
Transient Response
VOUT
VIN = 5V
200mV/DIV
VOUT
VIN = 2.2V
500mV/DIV
LOAD CURRENT
500mA/DIV
COUT = 47µF
L = 4.7µH
VIN = 3.3V
200µs/DIV
1000
3520 G04
3520 G06
Buck Load Transient
Response (PWM Mode)
BUCK VOUT
100mV/DIV
LOAD CURRENT
500mA/DIV
(50mA TO
500mA STEP)
VIN = 3.6V
VOUT = 1.8V
COUT = 10µF
100µs/DIV
3520 G07
Buck Load Transient
Response (Burst Mode Operation)
BUCK VOUT
100mV/DIV
LOAD CURRENT
200mA/DIV
(5mA TO
300mA STEP)
VIN = 3.6V
VOUT = 1.8V
100µs/DIV
COUT = 22µF
RBURST = 249k
3520 G08
3520f
5
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