LM2694_15 Datasheet, PDF (1/26 Pages) Texas Instruments – LM2694 30V, 600 mA Step Down Switching Regulator

LM2694
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SNVS444A – MAY 2006 – REVISED APRIL 2013
LM2694 30V, 600 mA Step Down Switching Regulator
Check for Samples: LM2694
FEATURES
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•2 Integrated N-Channel Buck Switch
• Integrated Start-Up Regulator
• Input Voltage Range: 8V to 30V
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Operating Frequency Remains Constant with
Load Current and Input Voltage Variations
• Maximum Duty Cycle Limited During Start-Up
• Adjustable Output Voltage
• Valley Current Limit At 0.6A
• Maximum Switching Frequency: 1 MHz
• Precision Internal Reference
• Low Bias Current
• Highly Efficient Operation
• Thermal Shutdown
DESCRIPTION
The LM2694 Step Down Switching Regulator features
all of the functions needed to implement a low cost,
efficient, buck bias regulator capable of supplying
0.6A to the load. This buck regulator contains an N-
Channel Buck Switch, and is available in the 3 x 3
thermally enhanced WSON-10 package and a
TSSOP-14 package. The feedback regulation
scheme requires no loop compensation, results in
fast load transient response, and simplifies circuit
implementation. The operating frequency remains
constant with line and load variations due to the
inverse relationship between the input voltage and
the on-time. The valley current limit results in a
smooth transition from constant voltage to constant
current mode when current limit is detected, reducing
the frequency and output voltage, without the use of
foldback. Additional features include: VCC under-
voltage lockout, thermal shutdown, gate drive under-
voltage lockout, and maximum duty cycle limiter.
TYPICAL APPLICATIONS
• High Efficiency Point-Of-Load (POL) Regulator
• Non-Isolated Telecommunication Buck
Regulator
• Secondary High Voltage Post Regulator
Package
• WSON-10 (3 mm x 3 mm) w/Exposed Pad
• TSSOP-14
Basic Step Down Regulator
8V - 30V
Input
C1
SHUTDOWN
VIN
VCC
R_ON
LM2694
BST
RON/SD
SW
SS
ISEN
C6
FB
RTN
SGND
C3
C4
L1
D1
R1
R2
V_OUT
R3
C2
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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