LTC3637_15 Datasheet, PDF (8/26 Pages) Linear Technology – 76V, 1A Step-Down Regulator

LTC3637
BLOCK DIAGRAM
11 ^ISET
1.3V
ACTIVE: 5µA
SLEEP: 1µA
RUN
14
+
1.21V
–
+
OVLO
12
–
+
PEAK CURRENT
COMPARATOR
V_IN
3
V_IN
C_IN
LOGIC
SW
1
GND
16
L1
D1 _COUT
V_OUT
INTV_CC*
20µA
REVERSE CURRENT
COMPARATOR
FBO
5
GND
8
GND
17
FEEDBACK
COMPARATOR
VOLTAGE _INTVCC*
REFERENCE
70Ω
0.800V
SOFTSTART
START-UP: 50µA
NORMAL: 5µA
SS
10
R1
V_FB
9
R2
V_PRG1
7
V_PRG2 V_PRG1
V_OUT
R1 R2
GND GND ADJUSTABLE 1.0M ∞
GND SS 5V FIXED 4.2M 800k
SS GND 3.3V FIXED 2.5M 800k
SS SS 1.8V FIXED 1.0M 800k
IMPLEMENT DIVIDER
EXTERNALLY FOR
ADJUSTABLE VERSION
V_PRG2
6
*WHEN V_IN > 5V, INTV_CC = 5V
WHEN V_IN ≤ 5V, INTV_CC FOLLOWS V_IN
3637 BD
3637fa
8
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