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LM2694 Datasheet Preview

LM2694 Datasheet

Step Down Switching Regulator

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LM2694
www.ti.com
SNVS444A – MAY 2006 – REVISED APRIL 2013
LM2694 30V, 600 mA Step Down Switching Regulator
Check for Samples: LM2694
FEATURES
1
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
RON
LM2694
BST
RON/SD
SW
SS
ISEN
C6
FB
RTN
SGND
C3
C4
L1
D1
R1
R2
VOUT
R3
C2
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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.
Copyright © 2006–2013, Texas Instruments Incorporated




etcTI

LM2694 Datasheet Preview

LM2694 Datasheet

Step Down Switching Regulator

No Preview Available !

LM2694
SNVS444A – MAY 2006 – REVISED APRIL 2013
Connection Diagrams
www.ti.com
1
NC
2
SW
3
BST
4
ISEN
5
SGND
6 RTN
7 NC
14
NC
VIN 13
12
VCC
11
RON/SD
SS 10
9
FB
NC 8
1 SW
2 BST
3
ISEN
4
SGND
5 RTN
10
VIN
9
VCC
8
RON/SD
7
SS
FB 6
Figure 1. 14-Lead TSSOP Package
See Package Number PW0014A
Figure 2. 10-Lead WSON Package
See Package Number DSC0010A
PIN NUMBER
WSON-10 TSSOP-14
1
2
2
3
3
4
4
5
5
6
6
9
7
10
8
11
9
12
10
13
1,7,8,14
EP
NAME
SW
BST
ISEN
SGND
RTN
FB
SS
RON/SD
VCC
VIN
NC
EP
Pin Descriptions
DESCRIPTION
Switching Node
Boost pin for bootstrap capacitor
Current sense
Current Sense Ground
Circuit Ground
Voltage feedback input from the
regulated output
Softstart
On-time control and shutdown
Output of the startup regulator
Input supply voltage
No connection.
Exposed Pad
APPLICATION INFORMATION
Internally connected to the buck switch source.
Connect to the inductor, free-wheeling diode, and
bootstrap capacitor.
Connect a 0.022 µF capacitor from SW to the BST
pin. The capacitor is charged from VCC via an
internal diode during the buck switch off-time.
During the buck switch off-time, the inductor current
flows through the internal sense resistor, and out of
the ISEN pin to the free-wheeling diode. The current
limit is nominally set at 0.62A.
Re-circulating current flows into this pin to the current
sense resistor.
Ground return for all internal circuitry other than the
current sense resistor.
Input to both the regulation and over-voltage
comparators. The FB pin regulation level is 2.5V.
An internal current source charges the SS pin
capacitor to 2.5V to soft-start the reference input of
the regulation comparator.
An external resistor from VIN to the RON/SD pin sets
the buck switch on-time. Grounding this pin shuts
down the regulator.
The voltage at VCC is nominally regulated at 7V.
Connect a 0.1 µF, or larger capacitor from VCC to
ground, as close as possible to the pins. An external
voltage can be applied to this pin to reduce internal
dissipation. MOSFET body diodes clamp VCC to VIN
if VCC > VIN.
Nominal input range is 8V to 30V. Input bypass
capacitors should be located as close as possible to
the VIN pin and RTN pins.
No internal connection. Can be connected to ground
plane to improve heat dissipation.
Exposed metal pad on the underside of the WSON
package. It is recommended to connect this pad to
the PC board ground plane to aid in heat dissipation.
2
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Product Folder Links: LM2694
Copyright © 2006–2013, Texas Instruments Incorporated


Part Number LM2694
Description Step Down Switching Regulator
Maker etcTI
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