LT3431 LINER [Linear Technology], LT3431 Datasheet - Page 24

• Manufacturer Part Number: LT3431
• Description: High Voltage, 3A,500kHz Step-Down Switching Regulator
• Manufacturer: LINER [Linear Technology]

LT3431
APPLICATIO S I FOR ATIO
24
1200
1000
800
600
400
200
0
0
Figure 14b. V
Allowable Load Current vs V
(5V) Load Current
V
500
OUT1
LOAD CURRENT (mA)
OUT2
1000
U
(–5V) Maximum
Figure 14a. Dual Polarity Output Converter with all Components Under 3mm Height
V
IN
U
1500
= 16V
V
2.2 F
†
* SEE FIGURE 14c FOR V
IN
36V TRANSIENT
CER
TO IMPROVE LOAD REGULATION.
LOAD CURRENT RELATIONSHIP
50V
FOR LOAD CURRENT LESS THAN 25mA,
A PRELOAD OF 200 SHOULD BE USED
V
C3
= 12V
OUT1
IN
9V TO 16V
= 9V
3431F14b
V
IN
2000
W
SHDN
SYNC
GND
V
IN
LT3431EFE
5.30
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4/75
4.70
OUT1
0
Figure 14c. V
Output Voltage vs Load Current
V
U
, V
OUT1
BOOST
OUT2
V
BIAS
C
SW
F
AT 500mA
200
R
1.5k
B
C
V
C
10nF
OUT2
C
LOAD CURRENT (mA)
400
15.4k
4.99k
OUT2
C
220pF
F
R2
R3
V
V
OUT1
OUT1
C2
0.22 F
(–5V)
600
AT 1A
V
OUT1
MMSD914T1
AT 1.5A
C4
10 F
6.3V
0805
X5R
CER
800
V
D2
IN
L2
CDRH6D28-100
10 H
3431 F14c
CDRH6D28-100
= 12V
1000
B140A
D1
B140A
10 H
D3
L1
C5
22 F
6.3V
X5R CER
C6
22 F
6.3V
X5R CER
V
–5V AT 0.9A*
100
OUT2
95
90
85
80
75
70
65
60
V
5V AT
1.5A*
3431 F14a
0
OUT1
V
†
OUT1
Figure 14d. Dual Polarity
Output Converter Efficiency
200
AT 500mA
V
OUT2
LOAD CURRENT (mA)
V
400
OUT1
AT 1A
V
600
OUT1
AT 1.5A
800
V
sn3431 3431fs
IN
= 12V
3431 F14d
1000