Datasheet LT8709 (Analog Devices) - 48

ManufacturerAnalog Devices
DescriptionNegative Input Synchronous Multi-Topology DC/DC Controller
Pages / Page48 / 48 — TYPICAL APPLICATION. 250kHz, Wide Input Range, Buck-Boost Converter …
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TYPICAL APPLICATION. 250kHz, Wide Input Range, Buck-Boost Converter Generates a –5V Output with Up to 7A Output Current

TYPICAL APPLICATION 250kHz, Wide Input Range, Buck-Boost Converter Generates a –5V Output with Up to 7A Output Current

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LT8709
TYPICAL APPLICATION 250kHz, Wide Input Range, Buck-Boost Converter Generates a –5V Output with Up to 7A Output Current
C1 L1 L2 • 10µF ×2 3.5µH 3.5µH • VOUT –5V 7A MN MP COUT2 + 330µF R ×2 CIN SENSE1
Efficiency and Power Loss vs
10µF 1.5mΩ ×4
Load Current
–VIN 100 7 C R OUT1 SENSE2 –VIN = –5V –VIN = –12V BG CSN CSP TG 100µF 2.2µF 5mΩ ×3 90 6 GND ISP 80 5 POWER LOSS (W) 13.3k LT8709 EN/FBIN ISN 70 4 –V + 330µF IN = –5V 10k 2.2µF 45.3k FBY 60 3 INTVCC EFFICIENCY (%) BIAS 50 2 100k MODE 2.2µF –VIN = –12V PG INTV 40 1 EE RT VC 30 0 0 1 2 3 4 5 6 7 SYNC 11k LOAD CURRENT (A) 8709 TA07b –V 100pF 2.2µF IN IMON SS 143k 68nF 470nF 3.3nF –VIN 8709 TA07a –4.5V TO –25V
Transient Response with 2.5A to 6.5A to 2.5A Output Load
L1, L2: WÜRTH-CFWI, 3.5µH, 74485540350 CIN: 50V, 10µF, X7R, 1210
Step (–V
MP: FAIRCHILD FDD4141 C1: 50V, 10µF, X7R, 1210
IN = –12V)
MN: INFINEON, BSC026N04LS COUT1: 16V, 100µF, X5R, 1210 RSENSE1: 1.5mΩ, 2512 COUT2: OSCON, 16V, 330µF, 16SEQP330M ILOAD RSENSE2: 5mΩ, 2512 5A/DIV VOUT 200mV/DIV AC-COUPLED IL1 + IL2 5A/DIV 200µs/DIV 8709 TA07c
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LT3757A Boost, Flyback, SEPIC and Inverting Controller 2.9V ≤ VIN ≤ 40V, 100kHz to 1MHz Programmable Operating Frequency, 3mm × 3mm DFN-10 and MSOP-10E Packages LT3758A Boost, Flyback, SEPIC and Inverting Controller 5.5V ≤ VIN ≤ 100V, 100kHz to 1MHz Programmable Operating Frequency, 3mm × 3mm DFN-10 and MSOP-10E Packages LT3759 Boost, SEPIC and Inverting Controller 1.6V ≤ VIN ≤ 42V, 100kHz to 1MHz Programmable Operating Frequency, MSOP-12E Package LT3957A Boost, Flyback, SEPIC and Inverting Converter 3V ≤ VIN ≤ 40V, 100kHz to 1MHz Programmable Operating Frequency, with 5A, 40V Switch 5mm × 6mm QFN Package LT3958 Boost, Flyback, SEPIC and Inverting Converter 5V ≤ VIN ≤ 80V, 100kHz to 1MHz Programmable Operating Frequency, with 3.3A, 84V Switch 5mm × 6mm QFN Package LT3959 Boost, SEPIC and Inverting Converter with 6A, 1.6V ≤ VIN ≤ 40V, 100kHz to 1MHz Programmable Operating Frequency, 40V Switch 5mm × 6mm QFN Package LT8710 Synchronous SEPIC/Inverting/Boost Controller with 4.5V ≤ VIN ≤ 80V, Rail to Rail Output Current Monitor and Control, C/10 or Output Current Control Power Good 8709fa 48 Linear Technology Corporation LT 0316 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95 F 0 o3r 5m -7or4e1 i7nformation www.linear.com/LT8709 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT8709 LINEAR TECHNOLOGY CORPORATION 2015
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