LM2696_15 Datasheet, PDF (1/28 Pages) Texas Instruments – LM2696 3A, Constant On Time Buck Regulator

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 mΩ Internal 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 V_IN range.
The LM2696 is capable of switching frequencies in
the range of 100 kHz to 500 kHz. Combined with an
integrated 130 mΩ high 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
V_PGOOD
V_SD
V_IN
C_SD
R_ON
C_IN
C_AVIN ^CSS
PGOOD EXTVCC
SD
C_EXT
RON CBOOT
AVIN
C_BOOT
SW
PVIN
SS
GND
FB
L
D_CATCH
R_FB1
R_FB2
V_OUT
C_OUT
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