Datasheet
Table Of Contents
- Features
- Applications
- Description
- Typical Application
- Absolute Maximum Ratings
- Pin Configuration
- Order Information
- Electrical Characteristics
- Typical Performance Characteristics
- Pin Functions
- Block Diagram
- Operation
- Applications Information
- Typical Applications
- Package Description
- Revision History
- Typical Application
- Related Parts
LT3990/LT3990-3.3/LT3990-5
8
3990fa
BLOCK DIAGRAM
R
SWITCH LATCH
D
BOOST
D
CATCH
BOOST
OSCILLATOR
200kHz TO 2.2MHz
SLOPE COMP
S
Q
–
+
–
+
–
+
Burst Mode
DETECT
ERROR
AMP
1.09V
SHDN
EN/UVLO
1.19V
C1
V
IN
INTERNAL 1.21V REF
–
+
RT
R
T
PG
FB
*LT3990-3.3: R1 = 12.65M, R2 = 7.35M
LT3990-5: R1 = 15.15M, R2 = 4.85M
LT3990
ONLY
LT3990-X
ONLY*
R2 R1
R1R2
V
C
V
OUT
GND
V
IN
BD
SW
V
OUT
C2
C3
3990 BD
L1