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LM2696 Datasheet Preview

LM2696 Datasheet

Constant On Time Buck Regulator

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LM2696
www.ti.com
SNVS375B – OCTOBER 2005 – REVISED APRIL 2013
LM2696 3A, Constant On Time Buck Regulator
Check for Samples: LM2696
FEATURES
1
2 Input Voltage Range of 4.5V–24V
• Constant On-Time
• No Compensation Needed
• Maximum Load Current of 3A
• Switching Frequency of 100 kHz–500 kHz
• Constant Frequency Across Input Range
• TTL Compatible Shutdown Thresholds
• Low Standby Current of 12 µA
• 130 mInternal MOSFET Switch
APPLICATIONS
• High Efficiency Step-Down Switching
Regulators
• LCD Monitors
• Set-Top Boxes
DESCRIPTION
The LM2696 is a pulse width modulation (PWM) buck
regulator capable of delivering up to 3A into a load.
The control loop utilizes a constant on-time control
scheme with input voltage feed forward. This provides
a topology that has excellent transient response
without the need for compensation. The input voltage
feed forward ensures that a constant switching
frequency is maintained across the entire VIN range.
The LM2696 is capable of switching frequencies in
the range of 100 kHz to 500 kHz. Combined with an
integrated 130 mhigh side NMOS switch the
LM2696 can utilize small sized external components
and provide high efficiency. An internal soft-start and
power-good flag are also provided to allow for simple
sequencing between multiple regulators.
The LM2696 is available with an adjustable output in
an exposed pad HTSSOP-16 package.
Typical Application Circuit
LM2696
VPGOOD
VSD
VIN
CSD
RON
CIN
CAVIN CSS
PGOOD EXTVCC
SD
CEXT
RON CBOOT
AVIN
CBOOT
SW
PVIN
SS
GND
FB
L
DCATCH
RFB1
RFB2
VOUT
COUT
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 © 2005–2013, Texas Instruments Incorporated




etcTI

LM2696 Datasheet Preview

LM2696 Datasheet

Constant On Time Buck Regulator

No Preview Available !

LM2696
SNVS375B – OCTOBER 2005 – REVISED APRIL 2013
Connection Diagram
SW 1
SW 2
SW 3
CBOOT 4
AVIN 5
EXTVCC 6
FB 7
N/C 8
Top View
16 PVIN
15 PVIN
14 PVIN
13 SD
12 RON
11 PGOOD
10 SS
9 GND
Figure 1. HTSSOP-16 Package
See Package Number PWP0016A
www.ti.com
Pin #
1, 2, 3
4
5
6
7
8
9
10
11
12
13
14, 15, 16
-
Name
SW
CBOOT
AVIN
EXTVCC
FB
N/C
GND
SS
PGOOD
RON
SD
PVIN
Exposed Pad
PIN DESCRIPTIONS
Function
Switching node
Bootstrap capacitor input
Analog voltage input
Output of internal regulator for decoupling
Feedback signal from output
No connect
Ground
Soft-start pin
Power-good flag, open drain output
Sets the switch on-time dependent on current
Shutdown pin
Power voltage input
Must be connected to ground
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
Submit Documentation Feedback
Product Folder Links: LM2696
Copyright © 2005–2013, Texas Instruments Incorporated


Part Number LM2696
Description Constant On Time Buck Regulator
Maker etcTI
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