LTC3630A Datasheet, PDF (21/24 Pages) Linear Technology – High Efficiency, 76V 500mA Synchronous Step-Down Converter

Typical Applications
5V to 76V Input to 5V Output,150mA Regulator
with 20kHz Minimum Burst Frequency
V_IN
5V TO 76V
C_IN
2.2µF
R_ISET
60.4k
V_IN
SW
LTC3630A
RUN V_FB
I_SET
SS
V_PRG2 V_PRG1
FBO
GND
L1
33µH
C_OUT
10µF
30.1Ω
IN
OUT
LTC6994-1
V⁺
976k
C_IN: TDK C3225X7R2AA225M
C_OUT: AVX 12063D106KAT
L1: COOPER BUSSMAN SD25-330
SET DIV
196k
GND
100k
3630a TA04
V_OUT
5V
150mA
LTC3630A
Burst Frequency vs Load Current
60
V_IN = 12V
50
40
30
20kHz LIMIT
20
10
0
0
NO LIMIT
1
10
LOAD CURRENT (mA)
100
3630a TA04b
24.5V to 76V Input to 24V Output with 150mA Input Current Limit
V_IN
24.5V TO 76V
C_IN
2.2µF
R3
806k
R4
7.5k
V_IN
SW
LTC3630A
RUN
V_FB
I_SET
SS
FBO V_PRG1
V_PRG2
GND
L1
22µH
R1
200k
R2
53.6k
3630a TA05
V_OUT
C_OUT ^24V
22µF
C_IN: TDK C3225X7R2A225M
C_OUT: TAIYO YUDEN EMK316BJ226ML-T
L1:TDK SLF10145T-220M1R9
Maximum Input and Load Current vs Input Voltage
500
400
MAXIMUM LOAD CURRENT
300
200
MAXIMUM INPUT CURRENT
100
0
25 30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
3630a TA05b
INPUT CURRENT LIMIT ≈ ^VOUT • ^R4
2 R3+R4
MAXIMUM LOAD CURRENT ≈ ^VIN • ^R4
2 R3+R4
For more information www.linear.com/LTC3630A
3630af
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