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| LTC3785 Datasheet, PDF (4/20 Pages) Linear Technology – 10V, High Effi ciency, Synchronous, No RSENSE Buck-Boost Controller | |||
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LTC3785
TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25°C unless otherwise noted)
Li-Ion to 3.3V Efï¬ciency vs
Load Current
100
Burst Mode
90 OPERATION
80
70
60
FIXED
FREQUENCY
50
40
30
20
10
0
0.0001
VIN = 4.2V
VIN = 3.6V
VIN = 3V
MOSFET Si7940
L = 4.7µH WURTH WE-PD
fOSC = 500kHz
0.001 0.01 0.1
1
10
LOAD CURRENT (A)
3785 G01
Two Li-Ion to 7V Efï¬ciency vs
Load Current
100
90 Burst Mode
OPERATION
80
70
60
FIXED
FREQUENCY
50
40
30
20
10
0
0.0001
VIN = 8.4V
VIN = 7.2V
VIN = 5.4V
MOSFET Si7940
L = 5.6µH MSS1260
fOSC = 430kHz
0.001 0.01 0.1
1
10
LOAD CURRENT (A)
3785 G02
Li-Ion/9V to 5V VOUT Efï¬ciency vs
Load Current
100
Burst Mode
90 OPERATION
80
70
60
50
40
30
20
10
0
0.0001
FIXED
FREQUENCY
VIN = 9V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
MOSFET Si7940
L = 5.6µH MSS1260
fOSC = 430kHz
0.001 0.01 0.1
1
10
LOAD CURRENT (A)
3785 G02
Burst Mode Ripple
Line Transient Response
VOUT Load Transient
VOUT
50mV/DIV
AC
COUPLED
INDUCTOR
CURRENT
1A/DIV
VOUT = 3.3V
COUT = 100µF
5µs/DIV
VOUT
500mV/
DIV
VIN
3V TO
8.5V
3785 G04
ILOAD = 300mA 500µs/DIV
VOUT = 5V
COUT = 100µF
VOUT
200mV/
DIV
3785 G05
ILOAD
10mA TO 2A
VIN = 3.6V
VOUT = 3.3V
COUT = 100µF
100µs/DIV
3785 G06
VFB vs Temperature
1.2255
1.2250
1.2245
1.2240
1.2235
1.2230
1.2225
1.2220
1.2215
1.2210
â50 â25
0 25 50
TEMPERATURE (°C)
75 100
3785 G07
Normalized Oscillator Frequency
vs Temperature
1.0
0.8
0.6
0.4
0.2
0
â0.2
â0.4
â0.6
â0.8
â1.0
â50 â25 0
25 50 75 100
TEMPERATURE (°C)
3785 G08
Oscillator Frequency vs RT
1200
1000
800
600
400
200
0
20
40
60
80
100
RT (kâ¦)
3785 G09
3785f
4
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