BUCK CONTROLLER. LM5116-HT Datasheet

LM5116-HT CONTROLLER. Datasheet pdf. Equivalent

LM5116-HT Datasheet
Recommendation LM5116-HT Datasheet
Part LM5116-HT
Description WIDE RANGE SYNCHRONOUS BUCK CONTROLLER
Feature LM5116-HT; LM5116-HT www.ti.com SLVSBS8B – OCTOBER 2013 – REVISED JANUARY 2014 WIDE RANGE SYNCHRONOUS BUCK C.
Manufacture etcTI
Datasheet
Download LM5116-HT Datasheet




Texas Instruments LM5116-HT
LM5116-HT
www.ti.com
SLVSBS8B – OCTOBER 2013 – REVISED JANUARY 2014
WIDE RANGE SYNCHRONOUS BUCK CONTROLLER
Check for Samples: LM5116-HT
FEATURES
1
2 Emulated Peak Current Mode
• Wide Operating Range Up to 80 V
• Low IQ Shutdown (< 10 µA)
• Drives Standard or Logic Level MOSFETs
• Robust 3.5-A Peak Gate Drive
• Free-Run or Synchronous Operation to 1 MHz
• Optional Diode Emulation Mode
• Programmable Output from 1.215 V to 80 V
• Precision 1.5% Voltage Reference
• Programmable Current Limit
• Programmable Soft-Start
• Programmable Line Under-Voltage Lockout
• Automatic Switch to External Bias Supply
APPLICATIONS
• Down-Hole Drilling
• High Temperature Environments
SUPPORTS EXTREME TEMPERATURE
APPLICATIONS
• Controlled Baseline
• One Assembly and Test Site
• One Fabrication Site
• Available in Extreme (–55°C to 175°C)
Temperature Range
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
• Texas Instruments' high temperature products
utilize highly optimized silicon (die) solutions
with design and process enhancements to
maximize performance over extended
temperatures.
DESCRIPTION
The LM5116 is a synchronous buck controller intended for step-down regulator applications from a high voltage
or widely varying input supply. The control method is based upon current mode control utilizing an emulated
current ramp. Current mode control provides inherent line feed-forward, cycle by cycle current limiting and ease
of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width
modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 drives external high-side and low-
side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables
discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown
disables the controller and consumes less than 10 µA of total input current. Additional features include a high
voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown,
frequency synchronization, cycle by cycle current limit and adjustable line under-voltage lockout.
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 © 2013–2014, Texas Instruments Incorporated



Texas Instruments LM5116-HT
LM5116-HT
SLVSBS8B – OCTOBER 2013 – REVISED JANUARY 2014
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
TJ
–55°C to 175°C
ORDERING INFORMATION(1)
PACKAGE
PART NUMBER
JD LM5116HJD
TOP-SIDE MARKING
LM5116HJD
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
Typical Application
VIN
VIN
CIN RUV2
UVLO
RUV1
CSYNC
RT
EN
RT/ SYNC
LM 5116
VCC
HB
CHB
HO
SW
LO
CS
CHF
CCOMP
RCOMP
COMP
FB
SS
CSG
DEMB
RAMP
VOUT
VCCX
AGND PGND
CSS
C RAMP
C VCC
VIN
L
RS
R FB2
RFB1
VOUT
C OUT
Connection Diagram
JD PACKAGE
(TOP VIEW)
VIN
UVLO
RT/ SYNC
EN
RAMP
AGND
SS
FB
COMP
VOUT
1
2
3
4
5
6
7
8
9
10
20 SW
19 HO
18 HB
17 VCCX
16 VCC
15 LO
14 PGND
13 CSG
12 CS
11 DEMB
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Copyright © 2013–2014, Texas Instruments Incorporated



Texas Instruments LM5116-HT
LM5116-HT
www.ti.com
Pin Functions
SLVSBS8B – OCTOBER 2013 – REVISED JANUARY 2014
Pin Descriptions
Pin Name Description
1 VIN Chip supply voltage, input voltage monitor and input to the VCC regulator.
2 UVLO If the UVLO pin is below 1.215 V, the regulator will be in standby mode (VCC regulator running, switching regulator
disabled). If the UVLO pin voltage is above 1.215 V, the regulator is operational. An external voltage divider can be
used to set an under-voltage shutdown threshold. There is a fixed 5 µA pull up current on this pin when EN is high.
UVLO is pulled to ground in the event a current limit condition exists for 256 clock cycles.
3 RT/SYNC The internal oscillator is set with a single resistor between this pin and the AGND pin. The recommended frequency
range is 50 kHz to 1 MHz. The internal oscillator can be synchronized to an external clock by AC coupling a positive
edge onto this node.
4 EN If the EN pin is below 0.5 V, the regulator will be in a low power state drawing less than 10 µA from VIN. EN must be
pulled above 3.3 V for normal operation. The maximum EN transition time for proper operation is one switching period.
5 RAMP Ramp control signal. An external capacitor connected between this pin and the AGND pin sets the ramp slope used
for current mode control.
6 AGND Analog ground. Connect to PGND through the exposed pad ground connection under the LM5116.
7 SS An external capacitor and an internal 10 µA current source set the soft start time constant for the rise of the error amp
reference. The SS pin is held low during VCC < 4.5 V, UVLO < 1.215 V, EN input low or thermal shutdown.
8 FB Feedback signal from the regulated output. This pin is connected to the inverting input of the internal error amplifier.
The regulation threshold is 1.215 V.
9 COMP Output of the internal error amplifier. The loop compensation network should be connected between this pin and the
FB pin.
10 VOUT Output monitor. Connect directly to the output voltage.
11 DEMB Low-side MOSFET source voltage monitor for diode emulation. For start-up into a pre-biased load, tie this pin to
ground at the CSG connection. For fully synchronous operation, use an external series resistor between DEMB and
ground to raise the diode emulation threshold above the low-side SW on-voltage.
12 CS Current sense amplifier input. Connect to the top of the current sense resistor or the drain of the low-sided MOSFET if
RDS(ON) current sensing is used.
13 CSG Current sense amplifier input. Connect to the bottom of the sense resistor or the source of the low-side MOSFET if
RDS(ON) current sensing is used.
14 PGND Power ground. Connect to AGND through the exposed pad ground connection under the LM5116.
15 LO Connect to the gate of the low-side synchronous MOSFET through a short, low inductance path.
16 VCC Locally decouple to PGND using a low ESR/ESL capacitor located as close to the controller as possible.
17 VCCX Optional input for an externally supplied VCC. If VCCX > 4.5 V, VCCX is internally connected to VCC and the internal
VCC regulator is disabled. If VCCX is unused, it should be connected to ground.
18 HB High-side driver supply for bootstrap gate drive. Connect to the cathode of the bootstrap diode and the positive
terminal of the bootstrap capacitor. The bootstrap capacitor supplies current to charge the high-side MOSFET gate
and should be placed as close to the controller as possible.
19 HO Connect to the gate of the high-side synchronous MOSFET through a short, low inductance path
20 SW Switch node. Connect to the negative terminal of the bootstrap capacitor and the source terminal of the high-side
MOSFET.
Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: LM5116-HT
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