LTC3646-1 Datasheet, PDF (24/28 Pages) Linear Technology – 40V, 1A Synchronous Step-Down Converter 1A Guaranteed Output Current

LTC3646/LTC3646-1
Typical Applications
12V to 1.8V Output with 400kHz External Sync
V_IN
12V
2Ω
22µF
2.2µF
R_COMP
49.9k
4.7µF
400kHz
EXTERNAL
CLOCK
226k
C_COMP
220pF
100k
PVIN
SVIN
RUN
INTV_CC
BOOST
LTC3646
SW
ITH
RT
SWITCH ^VON
MODE/SYNC ^CONTROL
EXTV_CC
0.6V
+ – _VFB
SGND
PGND
L1: WÜRTH WE-TPC-744-065-100
0.1µF
L1
10µH
V_OUT
1.8V
274k
C_F
4.7pF
100µF
137k
3646 TA02a
100
90
80
70
60
50
40
30
20
10
0
0.001
Efficiency Curve
0.01
0.1
LOAD CURRENT (A)
1
3646 TA02b
50mA to 1A Load Step
I_LOAD
1A/DIV
I_L
1A/DIV
V_OUT
100mV/DIV
AC-COUPLED
40µs/DIV
3646 TA02c
36461f
24