LT3959E View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3959E
Linear Technology
LT3959E Datasheet PDF : 26 Pages
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LT3959
Block Diagram (QFN Package)
VIN
R4 R3
SGND
L1
CDC
D1
VOUT
CIN
L2
R2
• FBX
COUT
R1
2.5V
IS3
VC
30
CC2
RC
CC1
SGND
1.72V – A11
+
G6
– A12
–0.86V +
FBX 31 FBX
VIN
RPG
35 PGOOD
1.6V +
A1
–
+
A2
–0.8V –
Q4
G8
1.52V – A13
+
G7
– A14
–0.76V +
25
EN/UVLO
IS1
2.2µA
27
VIN
A10
1.22V
2.5V
IS2
10µA
Q3
BANDGAP
REFERENCE
BG INTERNAL BIAS
GENERATOR
BG_LOW
G4
UVLO INTERNAL BIAS
OTP
A8
TSD
~165˚C
VC –
+A7
G5
Q2
PWM
COMPARATOR
SGND
CURRENT
LIMIT
VIN LDO
1.2V
SR1
RQ
S
A15
–
1.25V
+A3
SLOPE
RAMP
VISENSE
2.7V
RAMP
GENERATOR
G1
100kHz ~ 1MHz
OSCILLATOR
28
DRIVE
CURRENT
LIMIT
DRIVE LDO
INTVCC 36 CVCC
DRIVER
G2
SGND
8, 9, 20, 21
SW
M1
45mV
A6
A5
RSENSE
GND
13, 14
15, 16
17
FREQUENCY
FOLDBACK
FREQ
FOLDBACK
1.25V
+
+ A4
Q1
–
FREQ
PROG
SS
32
CSS
SYNC
34
RT
33
RT
SGND
4, 24
GNDK
12
3759 F01
Figure 1. LT3959 Block Diagram Working as a SEPIC Converter (Shown for QFN Package)
3959fa
8
For more information www.linear.com/LT3959
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