lt3688fe Linear Technology Corporation, lt3688fe Datasheet - Page 5
lt3688fe
Manufacturer Part Number
lt3688fe
Description
Lt3688 - Dual 800ma Step-down Switching Regulator With Power-on Reset And Watchdog Timer
Manufacturer
Linear Technology Corporation
Datasheet
1.LT3688FE.pdf
(28 pages)
TYPICAL PERFORMANCE CHARACTERISTICS
160
140
120
100
350
300
250
200
150
100
1.5
0.5
80
60
40
20
50
0
2
1
0
0
0
0
0
No-Load Supply Current (Input)
Maximum Load Current (3.3V)
Switch Voltage Drop
f
SW
= 1MHz
200
10
10
SWITCH CURRENT (mA)
INPUT VOLTAGE (V)
400
L = 15μH
V
IN
20
20
(V)
L = 10μH
600
V
30
30
OUT2
V
800
OUT1
= 3.3V
3688 G04
3688 G07
3688 G10
= 5V
1000
40
40
3000
2500
2000
1500
1000
500
1.8
1.6
1.4
1.2
0.8
0.6
0.4
0.2
25
20
15
10
0
–50 –25
1
0
5
0
0
0
No-Load Supply Current
(Temperature)
Switch Current Limit
vs Duty Cycle
BST Pin Current
CATCH DIODE: B140HB
V
V
V
IN
OUT1
OUT2
= 12V
= 5V
= 3.3V
200
20
0
SWITCH CURRENT (mA)
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT HIGH
TEMPERATURE
TEMPERATURE (°C)
DUTY CYCLE (%)
25
400
40
TYPICAL
MIN
50
600
60
75
100 125 150
800
80
3688 G05
T
3688 G08
3688 G11
A
1000
= 25°C unless otherwise noted.
100
0.810
0.805
0.800
0.795
0.790
2.0
1.5
1.0
0.5
1.5
0.5
0
2
1
0
–50 –25
–50 –20
0
Feedback Voltage
Maximum Load Current (5V)
Switch Current Limit
vs Temperature
DC = 15%
f
SW
= 1MHz
10
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
25
25
L = 15μH
50
50
20
L = 10μH
LT3688
75
75
100 125 150
100 125
30
3688 G09
3688 G06
3688 G12
5
3688f
150
40