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reference designLT7809

Analog Devices LT7809

135V Synchronous Buck Controller with Symmetrical Sink/Source Capability and Dynamically Adjustable Output Voltage Programming

Overview

TopologyBuck Converter
Input voltage8-135 V
Switching frequency100-2500 kHz
IC revisionA

Description

The LT7809 is a high-performance, step-down, DC/DC switching regulator controller that drives a N-channel synchronous silicon metal oxide semiconductor fieldeffect transistor (MOSFET) stage and can operate voltages up to 135V. Its constant frequency current mode architecture allows a phase-lockable switching frequency of up to 2.5MHz. The gate drive voltage for the LT7809 is 10V to drive standard-threshold MOSFETs to maximize efficiency. An internal charge pump allows for 100% duty cycle operation. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LT7809 features a precision 0.8V reference, enabling the output voltage to be statically programmed from 0.8V to 135V. An output voltage adjustment pin, combined with the LT7809’s symmetrical sink and source current capability, allows the output voltage to be dynamically slewed up or down.

Features

Wide Input Voltage (VIN - VSS) Range:8.0V to 135V (140V ABS MAX) Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140VABS MAX) Dynamically Adjustable VOUT Programming Symmetrical Sink and Source Current Capability forFast VOUT Slewing Up or Down Split-Output Gate Drivers for Adjustable Turn-Onand Turn-Off Driver Strengths and Small DeadTimes (35ns) Floating I/O Control Pins Referenced to System GND 100% Duty Cycle Operation Programmable or Synchronizable Frequency(100kHz to 2.5MHz) 32-Pin (5mm x 5mm) QFN Package

Typical applications

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
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Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
fres(MHz)
Wire Type
C
VR(V (DC))
Endurance(h)
IRIPPLE(mA)
ILeak(µA)
DF(%)
Pitch(mm)
Ø D(mm)
L(mm)
Packaging
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7443631500
SPECWE-HCF SMT High Current Inductor, 15 µH, 15.4 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance15 µH
Performance Rated Current15.4 A
Saturation Current @ 10%19 A
Saturation Current @ 30%21 A
DC Resistance9.57 mΩ
Self Resonant Frequency12.8 MHz
Wire TypeFlat 
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Length20.8 mm
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860241078002
SPECWCAP-AT1H Aluminum Electrolytic Capacitors, –, –
Simu­lation
Availability
–
Downloads7 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors
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Capacitance47 µF
Rated Voltage200 V (DC)
Endurance 10000
Ripple Current980 mA
Leakage Current476 µA
Dissipation Factor15 %
Pitch5 mm
Diameter13 mm
Length20 mm
PackagingAmmopack 
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Additional parts recommended by Würth Elektronik

Recommended parts are Würth Elektronik alternatives that are not formally approved for this reference design. Please verify it is suitable for your application, and contact us if you have any questions.

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IR(A)
ISAT(A)
RDC max.(mΩ)
fres(MHz)
SamplesAvailability & Sample
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7687714471
SPECWE-PD HV SMT Power Inductor (High Voltage), 470 µH, 0.6 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
–
Downloads10 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PD HV SMT Power Inductor (High Voltage)
Inductance470 µH
Rated Current0.6 A
Saturation Current0.8 A
DC Resistance1450 mΩ
Self Resonant Frequency2.7 MHz
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