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| LM34919_14 Datasheet, PDF (6/21 Pages) Texas Instruments – Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator | |||
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LM34919
SNOSAY2D â MAY 2007 â REVISED JUNE 2008
www.ti.com
Typical Performance Characteristics (continued)
Voltage at the RON/SD Pin
Shutdown and Operating Current into VIN
TYPICAL APPLICATION CIRCUIT AND BLOCK DIAGRAM
8V-40V
Input
VIN
C5
C1
RON
RON/SD
7V SERIES
REGULATOR
LM34919
ON TIMER
RON
START
COMPLETE
VCC
UVLO
OFF TIMER
START
COMPLETE
-
+
0.8V
VCC
C3
BST
2.5V
10.5 PA
SS
C6
FB
RTN
+
-
REGULATION
COMPARATOR
+
- OVER-
2.9V VOLTAGE
COMPARATOR
LOGIC
DRIVER
GATE DRIVE
UVLO
C4
VIN
LEVEL
SHIFT
DRIVER
L1
SW
THERMAL
SHUTDOWN
CURRENT LIMIT
COMPARATOR
+
-
-
64 mV +
D1
RSENSE
100 m:
R1
ISEN
SGND R2
VOUT
R3
C2
6
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Copyright © 2007â2008, Texas Instruments Incorporated
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