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LM2695 Datasheet Preview

LM2695 Datasheet

Step Down Switching Regulator

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LM2695
www.ti.com
SNVS413A – JANUARY 2006 – REVISED APRIL 2013
LM2695 High Voltage (30V, 1.25A) Step Down Switching Regulator
Check for Samples: LM2695
FEATURES
1
2 Integrated 33V, 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
• Maximum Duty Cycle Limited During Start-Up
• Adjustable Output Voltage
• Valley Current Limit At 1.25A
• Precision Internal Reference
• Low Bias Current
• Highly Efficient Operation
• Thermal Shutdown
TYPICAL APPLICATIONS
• High Efficiency Point-Of-Load (POL) Regulator
• Non-Isolated Telecommunication Buck
Regulator
• Secondary High Voltage Post Regulator
DESCRIPTION
The LM2695 Step Down Switching Regulator features
all of the functions needed to implement a low cost,
efficient, buck bias regulator capable of supplying
1.25A to the load. This buck regulator contains a 33V
N-Channel Buck Switch, and is available in the
thermally enhanced WSON-10 and HTSSOP-14
packages. The hysteretic 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
current limit detection is set at 1.25A. Additional
features include: VCC under-voltage lockout, thermal
shutdown, gate drive under-voltage lockout, and
maximum duty cycle limiter.
PACKAGE
• 10-Pin WSON (4 mm x 4 mm)
• 14-Pin HTSSOP
• Exposed Thermal Pad For Improved Heat
Dissipation
Basic Step Down Regulator
8V - 30V
Input
C1
SHUTDOWN
VIN
VCC
RON
LM2695
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

LM2695 Datasheet Preview

LM2695 Datasheet

Step Down Switching Regulator

No Preview Available !

LM2695
SNVS413A – JANUARY 2006 – REVISED APRIL 2013
Connection Diagram
www.ti.com
1
NC
2
SW
3
BST
4 ISEN
5
SGND
6
RTN
7 NC
14
NC
13
VIN
12
VCC
11
RON/SD
10
SS
9
FB
NC 8
Figure 1. 14-Lead HTSSOP (Top View)
See PWP0014A Package
1
SW
2
BST
3
ISEN
4
SGND
5
RTN
10
VIN
9
VCC
8
RON/SD
7
SS
FB 6
Figure 2. 10-Lead WSON (Top View)
See DPR0010A Package
Pin Number
WSON-10 HTSSOP-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
Name
SW
BST
ISEN
SGND
RTN
FB
SS
RON/SD
VCC
VIN
NC
EP
PIN DESCRIPTIONS
Description
Application Information
Switching Node
Boost pin for bootstrap capacitor
Current sense
Sense Ground
Circuit Ground
Feedback input from the regulated
output
Softstart
On-time control and shutdown
Output from the startup regulator
Input supply voltage
No connection.
Exposed Pad
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 this pin.
The capacitor is charged from VCC via an internal
diode during each off-time.
The re-circulating current flows through the internal
sense resistor, and out of this pin to the free-wheeling
diode. Current limit is nominally set at 1.25A.
Re-circulating current flows into this pin to the current
sense resistor.
Ground for all internal circuitry other than the current
limit detection.
Internally connected to the regulation and over-
voltage comparators. The regulation level is 2.5V.
An internal 12.3 µA current source charges an
external capacitor to 2.5V, providing the softstart
function.
An external resistor from VIN to this pin sets the buck
switch on-time. Grounding this pin shuts down the
regulator.
Nominally regulates at 7.0V. An external voltage (8V-
14V) can be applied to this pin to reduce internal
dissipation. An internal diode connects VCC to VIN.
Nominal input range is 8.0V to 30V.
No internal connection.
Exposed metal pad on the underside of the device. It
is recommended to connect this pad to the PC board
ground plane to aid in heat dissipation.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Product Folder Links: LM2695
Copyright © 2006–2013, Texas Instruments Incorporated


Part Number LM2695
Description Step Down Switching Regulator
Maker etcTI
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