LT1613 Linear Technology Corporation, LT1613 Datasheet
LT1613
Available stocks
Related parts for LT1613
LT1613 Summary of contents
Page 1
... A constant frequency, internally compensated current mode PWM architecture results in low, predictable output noise that is easy to filter. The high voltage switch on the LT1613 is rated at 36V, making the device ideal for boost converters up to 34V as well as for Single-Ended Primary Inductance Converter (SEPIC) and flyback designs. The device can generate 200mA from a 3 ...
Page 2
... IN = 300mA = Note 2: The LT1613C is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Current limit guaranteed by design and/or correlation to static test. U ...
Page 3
... TEMPERATURE ( 1613 G04 Switching Waveforms, Circuit of Figure 1 V OUT 150mA 200ns/DIV LOAD LT1613 SHDN Pin Current 100 SHDN PIN VOLTAGE (V) 1613 G02 Feedback Pin Voltage 1.25 1.24 VOLTAGE 1 ...
Page 4
... R4 140k U OPERATIO The LT1613 is a current mode, internally compensated, fixed frequency step-up switching regulator. Operation can be best understood by referring to the Block Diagram. Q1 and Q2 form a bandgap reference core whose loop is closed around the output of the regulator. The voltage drop across R5 and R6 is low enough such that Q1 and Q2 do not saturate, even when ...
Page 5
... IN oscillation. The ground terminal of output capacitor C2 should tie close to Pin 2 of the LT1613. Doing this reduces dI/dt in the ground copper which keeps high frequency spikes to a minimum. The DC/DC converter ground should tie to the PC board ground plane at one place only, to avoid intro- ducing dI/dt in the ground plane ...
Page 6
... Diodes A Schottky diode is recommended for use with the LT1613. The Motorola MBR0520 is a very good choice. Where the input to output voltage differential exceeds 20V, use the MBR0530 (a 30V diode). If cost is more important than efficiency, the 1N4148 can be used, but only at low current loads ...
Page 7
... LT1613 node due to parasitic PC OUT , is pictured the improved PL and R3, is pictured OUT 330pF IN R1 LT1613 R3 C2 37.4k 10k 10 F SHDN FB GND R2 12.1k 1613 F08 Added to Increase Phase Margin, PL 200 s/DIV 1613 F09 and 10k in Series with FB Pin PL 7 ...
Page 8
... Ceramic Output Capacitor 50mV/DIV AC COUPLED 120mA LOAD CURRENT 1613 F12 Figure 15. 5V Output SEPIC with 10 F Ceramic Output Capacitor, 330pF 330pF LT1613 R3 10k SHDN FB R1 GND R2 37.4k 12.1k Adds Phase Margin PL V OUT 20mA 200 s/DIV . ...
Page 9
... U OPERATIO START-UP/SOFT-START When the LT1613 SHDN pin voltage goes high, the device rapidly increases the switch current until internal current limit is reached. Input current stays at this level until the output capacitor is charged to final output voltage. Switch current can exceed 1A. Figure 16’s oscillograph details start-up waveforms of Figure 17’ ...
Page 10
... C3: AVX 1206YG105 CERAMIC D1: MBR0520 4-Cell to 15V/30mA DC/DC Converter D1 V OUT 15V/30mA SW 1nF R1 + 137k C2 1% 10k 4 12.1k 1613 TA04 0.22 F 0. 274k LT1613 C1 4.7 F SHDN FB GND 48. OUT 5V 175mA 1613 • TA03 Efficiency 6. 3. ...
Page 11
... 270pF IN LT1613 102k SHDN FB GND 33. (847) 639-6400 3. LT1613 SHDN FB GND 33.2k LT1613 15V/10mA 12V/10mA 5V/50mA 1613 TA07 15V/10mA 5V/50mA C5 4 –7.5V/10mA 270pF 102k 1613 TA08 11 ...
Page 12
... Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com Li-Ion to 16V/20mA Step-Up DC/DC Converter 4.7 F LT1613 165k 1% SHDN SHDN FB GND 13. Dimensions in inches (millimeters) unless otherwise noted. S5 Package 5-Lead Plastic SOT-23 (LTC DWG # 05-08-1633) 0.00 – 0.15 0.90 – ...