Datasheet

LTC4020
14
4020fd
For more information www.linear.com/LTC4020
block DiagraM
DC/DC Controller Block Diagram
A
SWITCH DRIVERS
B
NOL
PV
IN
FEEDBACK
REFERENCE
(2.5V)
SHUTDOWN/REFERENCES
PWM CONTROL
COUNTER
(128 CYCLES)
INTERNAL ENABLE
2mV
(V
SENS
)
SHDN RT
VOLTAGE/CURRENT SENSE
SENSVIN SENSTOP V
FBMAX
2.75V
1V
I
LIMIT
SENSBOT SENSGND
ITH VC
INTV
CC
BST1
TG1
SW1
INTV
CC
BG1
PGND
×2.04
×2
1.225V
+
–
–
+ +
OSCILLATOR
FREQUENCY SET
–
+
–
+
–
+
200µ EA-C
A
Ω
+
–
200µ EA-C
B
Ω
+
–
95µ EA-V
Ω
+
–
5k
5k
gm = 10µ
VC
BUCK
VC
BOOST
1V CLAMP/
DETECT
S R
Q
S R
Q
CLK
4020 BDa
RESET
128
INTV
CC
BG2
PGND
BST2
TG2
SW2
SGND
C
D
NOL
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