Datasheet LT8471 (Analog Devices) - 36

LT8471
Typical applicaTion Efficiency and Power Loss 500kHz ZETA and 2L Inverting Converters Generates V ±5V Outputs with Low Output Ripple CC = 12V, with Load Current from VOUT2 to VOUT1
90 4 L1A, 10µH • 80 EFFICIENCY C4 C6 2.2µF 1µF L1B 70 V 10µH 3 CC POWER LOSS ( 4V TO VIN1 C1 • VOUT1, –5V 60 25V C7 0.55A (VCC = 4V) 2.2µF D1 0.95A (V 50 CC = 12V) 80.6k 2 V 1.05A (V IN2 CC = 24V) 40 POWER LOSS C3 W 1µF C1 EFFICIENCY (%) 30 ) SHOUT FB1 47µF LT8471 E1 15k ×3 20 1 C3 GND L3 C5 10 280k 15µH 2.2µF 15k C2 C2 0 0 OV/UV FB2 47µF 0 0.2 0.4 0.6 0.8 1.0 SS1 C8 ×3 80.6k LOAD CURRENT (A) L2B, 10µH 8471 TA02b 182k 1µF SS2 E2 V • OUT2, 5V 0.55A (VCC = 4V) SYNC RT PG1 PG2 • L2A 0.95A (VCC = 12V) D2 0.1µF 10µH 1.05A (VCC = 24V) 0.1µF
Output Voltage Ripple in CCM, VCC = 10V
169k 100k 100k VOUT1 20mV/DIV 8471 TA02a AC-COUPLED C1, C2: 10V, X7R, 1210 VOUT2 C3, C4, C5, C7: 35V, X7R, 1206 20mV/DIV C6, C8: 50V, X7R, 1206 AC-COUPLED D1, D2: MICROSEMI UPS140 L1, L2: COOPER BUSSMANN DRQ74-100-R IL2 L3: WÜRTH 744025 150 500mA/DIV IL1 500mA/DIV 8471 TA02c 1µs/DIV
relaTeD parTs PART NUMBER DESCRIPTION COMMENTS
LT8610/LT8611 42V, 2.5A, 96% Efficiency, 2.2MHz Synchronous Micropower VIN: 3.4V to 42V, VOUT(MIN) = 0.985V, IQ = 2.5µA, ISD <1µA, Step-Down DC/DC Converter with IQ = 2.5µA and Input/ MSOP-16E and 3mm × 5mm QFN-24 Packages Output Current Limit/Monitor (LT8611 Only) LT8610A/ 42V, 3.5A, 96% Efficiency, 2.2MHz Synchronous Micropower VIN: 3.4V to 42V, VOUT(MIN) = 0.985V, IQ = 2.5µA, ISD <1µA, LT8610AB Step-Down DC/DC Converter with IQ = 2.5µA MSOP-16E and 3mm × 5mm QFN-24 Package LT8582 40V, Dual 3A, 2.5MHz High Efficiency Boost Converter VIN: 2.5V to 22V, 40VMAX, VOUT(MAX) = ±40V, IQ = 2.8µA, ISD <1µA, 7mm × 4mm DFN-24 Package LT3581 40V, 3.3A, 2.5MHz High Efficiency Boost Converter VIN: 2.5V to 22V, 40VMAX, VOUT(MAX) = ±40V, IQ = 1mA, ISD <1µA, 4mm × 3mm DFN-14 and MSOP-16E Packages LT8582 40V, Dual 3A Boost, Inverter, SEPIC, 2.5MHz High Efficiency VIN: 2.5V to 22V, 40VMAX, VOUT(MAX) = ±40V, IQ = 2.1mA, Boost Converter ISD <1µA, 7mm × 4mm DFN-24 Package LT3579/LT3579-1 40V, 3.3A Boost, Inverter, SEPIC, 2.5MHz High Efficiency VIN: 2.5V to 22V, 40VMAX, VOUT(MAX) = ±40V, IQ = 1mA, ISD <1µA, Boost Converter 4mm × 5mm QFN-20 and TSSOP-20E Packages LT3471 40V Dual 1.3A Boost, Inverter, 1.2MHz High Efficiency VIN: 2.4V to 16V, 40VMAX, VOUT(MAX) = ±40V, IQ = 2.4mA, Boost Converter ISD <1µA, 3mm × 3mm DFN Package 8471fd 36 Linear Technology Corporation LT 0915 REV D • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 950 F3or5 -m 7 o4re 17in formation www.linear.com/8471 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/8471 LINEAR TECHNOLOGY CORPORATION 2014 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Related Parts