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Buck Regulator. LM2696 Datasheet

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Buck Regulator. LM2696 Datasheet
















LM2696 Regulator. Datasheet pdf. Equivalent













Part

LM2696

Description

Constant On Time Buck Regulator



Feature


LM2696 www.ti.com SNVS375B – OCTOBER 2005 – REVISED APRIL 2013 LM2696 3A , Constant On Time Buck Regulator Check for Samples: LM2696 FEATURES 1 •2 I nput Voltage Range of 4.5V–24V • Co nstant On-Time • No Compensation Need ed • Maximum Load Current of 3A • S witching Frequency of 100 kHz–500 kHz • Constant Frequency Across Input Ra nge • TTL Compatible Shutdown Threshol.
Manufacture

Texas Instruments

Datasheet
Download LM2696 Datasheet


Texas Instruments LM2696

LM2696; ds • Low Standby Current of 12 µA • 130 mΩ Internal MOSFET Switch APPLIC ATIONS • High Efficiency Step-Down Sw itching Regulators • LCD Monitors • Set-Top Boxes DESCRIPTION The LM2696 is a pulse width modulation (PWM) buck regulator capable of delivering up to 3 A into a load. The control loop utilize s a constant on-time control scheme wit h input voltage feed forward. T.


Texas Instruments LM2696

his provides a topology that has excelle nt transient response without the need for compensation. The input voltage fee d forward ensures that a constant switc hing frequency is maintained across the entire VIN range. The LM2696 is capabl e of switching frequencies in the range of 100 kHz to 500 kHz. Combined with a n integrated 130 mΩ high side NMOS sw itch the LM2696 can .


Texas Instruments LM2696

utilize small sized external components and provide high efficiency. An interna l soft-start and power-good flag are al so provided to allow for simple sequenc ing between multiple regulators. The LM 2696 is available with an adjustable ou tput in an exposed pad HTSSOP-16 packag e. Typical Application Circuit LM2696 VPGOOD VSD VIN CSD RON CIN CAVIN C SS PGOOD EXTVCC S.





Part

LM2696

Description

Constant On Time Buck Regulator



Feature


LM2696 www.ti.com SNVS375B – OCTOBER 2005 – REVISED APRIL 2013 LM2696 3A , Constant On Time Buck Regulator Check for Samples: LM2696 FEATURES 1 •2 I nput Voltage Range of 4.5V–24V • Co nstant On-Time • No Compensation Need ed • Maximum Load Current of 3A • S witching Frequency of 100 kHz–500 kHz • Constant Frequency Across Input Ra nge • TTL Compatible Shutdown Threshol.
Manufacture

Texas Instruments

Datasheet
Download LM2696 Datasheet




 LM2696
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




 LM2696
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




 LM2696
LM2696
www.ti.com
SNVS375B – OCTOBER 2005 – REVISED APRIL 2013
ABSOLUTE MAXIMUM RATINGS(1)(2)(3)
Voltages from the indicated pins to GND
AVIN
PVIN
CBOOT
CBOOT to SW
FB, SD, SS, PGOOD
Storage Temperature Range
Junction Temperature
Lead Temperature (Soldering, 10 sec.)
Minimum ESD Rating
0.3V to +26V
0.3V to (AVIN+0.3V)
0.3V to +33V
0.3V to +7V
0.3V to +7V
65°C to +150°C
+150°C
260°C
1.5 kV
(1) Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications, see Electrical
Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(3) Without PCB copper enhancements. The maximum power dissipation must be derated at elevated temperatures and is limited by TJMAX
(maximum junction temperature), θJ-A (junction to ambient thermal resistance) and TA (ambient temperature). The maximum power
dissipation at any temperature is: PDissMAX = (TJMAX - TA) /θJ-A up to the value listed in the Absolute Maximum Ratings. θJ-A for HTSSOP-
16 package is 38.1°C/W, TJMAX = 125°C.
OPERATING RANGE
Junction Temperature
AVIN to GND
PVIN
40°C to +125°C
4.5V to 24V
4.5V to 24V
ELECTRICAL CHARACTERISTICS
Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over the full Operating
Temperature Range (TJ = 40°C to +125°C). Minimum and Maximum limits are specified through test, design or statistical
correlation. Typical values represent the most likely parametric norm at TJ = 25°C and are provided for reference purposes
only. Unless otherwise specified VIN = 12V.
Symbol
Parameter
Condition
Min
Typ
Max Units
VFB
ICL
RDS_ON
IQ
VUVLO
VUVLO HYS
ISD
kON
VD ON
TOFF_MIN
Feedback Pin Voltage
Switch Current Limit
Switch On Resistance
Operating Quiescent Current
AVIN Under Voltage Lockout
AVIN Under Voltage Lockout Hysteresis
Shutdown Quiescent Current
Switch On-Time Constant
RON Voltage
Minimum Off Time
VIN = 4.5V to 24V
ISW = 0A to 3A
VCBOOT = VSW + 5V
ISW = 3A
VFB = 1.5V
Rising VIN
VSD = 0V
ION = 50 µA to 100 µA
FB = 1.24V
FB = 0V
1.225
3.6
3.9
50
0.35
1.254
4.9
0.13
1.3
4.125
60
12
66
0.65
165
12
1.282
6.4
0.22
2
4.3
120
25
82
0.95
250
30
V
A
mA
V
mV
µA
µA µs
V
ns
µs
TON MIN
VEXTV
ΔVEXTV
VPWRGD
Minimum On-time
EXTVCC Voltage
EXTVCC Load Regulation
PGOOD Threshold (PGOOD Transition
from Low to High)
IEXTV = 0 µA to 50 µA
With respect to VFB
400
ns
3.30
3.65
4.00
V
0.03
0.5
%
91.5
93.5
95.5
%
VPG_HYS
IOL
IOH
IFB
ISS_SOURCE
PGOOD Hysteresis
PGOOD Low Sink Current
PGOOD High Leakage Current
Feedback Pin Bias Current
Soft-Start Pin Source Current
VPGOOD = 0.4V
VFB = 1.2V
VSS = 0V
1
2.1
%
0.5
2
mA
50
nA
0
nA
0.7
1
1.4
µA
Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LM2696
Submit Documentation Feedback
3




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