LTC3785-1 Linear Technology, LTC3785-1 Datasheet - Page 4

• Manufacturer Part Number: LTC3785-1
• Description: Buck-Boost Controller
• Manufacturer: Linear Technology

www.DataSheet4U.com
LTC3785-1
TYPICAL PERFORMANCE CHARACTERISTICS
4
INDUCTOR
50mV/DIV
CURRENT
COUPLED
1.2255
1.2250
1.2245
1.2240
1.2235
1.2230
1.2225
1.2220
1.2215
1.2210
1A/DIV
V
100
OUT
AC
90
80
70
60
50
40
30
20
10
0.0001
0
–50
Burst Mode Ripple
Li-Ion to 3.3V Effi ciency vs
Load Current
V
C
V
OUT
OUT
FB
OPERATION
Burst Mode
–25
= 3.3V
= 100μF
vs Temperature
0.001
LOAD CURRENT (A)
TEMPERATURE (°C)
0
0.01
5μs/DIV
MOSFET Si7940
L = 4.7μH WURTH WE-PD
f
OSC
25
= 500kHz
FIXED
FREQUENCY
0.1
50
V
V
V
1
IN
IN
IN
75
= 4.2V
= 3.6V
= 3V
37851 G01
37851 G07
37851 G04
100
10
500mV/
3V TO
V
8.5V
–0.2
–0.4
–0.6
–0.8
–1.0
100
OUT
DIV
V
1.0
0.8
0.6
0.4
0.2
20
10
90
80
70
60
50
40
30
0.0001
IN
0
0
–50
Two Li-Ion to 7V Effi ciency vs
Load Current
Line Transient Response
I
V
C
Normalized Oscillator Frequency
vs Temperature
LOAD
OUT
OUT
OPERATION
Burst Mode
= 5V
= 100μF
–25
= 300μA
0.001
TEMPERATURE (°C)
LOAD CURRENT (A)
0
0.01
500μs/DIV
25
MOSFET Si7940
L = 5.6μH MSS1260
f
FIXED
FREQUENCY
OSC
0.1
50
= 430kHz
V
V
V
IN
IN
IN
1
75
= 8.4V
= 7.2V
= 5.4V
37851 G02
37851 G08
37851 G05
100
10
10mA TO 2A
200mV/
I
V
1200
1000
LOAD
100
OUT
800
600
400
200
DIV
90
80
70
60
40
30
20
10
50
0.0001
0
0
20
V
V
C
Li-Ion/9V to 5V V
Load Current
V
Oscillator Frequency vs RT
IN
OUT
OUT
OUT
OPERATION
= 3.6V
Burst Mode
= 3.3V
= 100μF
0.001
Load Transient
40
LOAD CURRENT (A)
0.01
100μs/DIV
RT (kΩ)
60
OUT
MOSFET Si7940
L = 5.6μH MSS1260
f
OSC
0.1
FIXED
FREQUENCY
Effi ciency vs
= 430kHz
80
V
V
V
V
IN
IN
IN
IN
1
= 9V
= 4.2V
= 3.6V
= 2.7V
37851 G03
37851 G06
37851 G09
37851f
100
10