DEMO MANUAL DC093 DEMO MANUAL DC093NO-DESIGN SWITCHER LT1371 5V to 12V Step-Up Converter U DESCRIPTIO Demonstration board DC093A is a complete DC/DC step- High frequency switching allows the use of small induc- up switching regulator using the LT 1371 constant fre- tors, making this all surface mount solution ideal for space quency, high efficiency converter in a 7-pin DD package. conscious systems. , LTC and LT are registered trademarks of Linear Technology Corporation. WWU W T = 25C, V = 5V, S/S pin open, unless otherwise specified. PERFOR A CE SU ARY A IN PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage R2 = R3 = 1% (Note 1) 11.60 12.04 12.50 V Output Current V = 5V 800 mA IN Input Voltage Range (Note 2) 2.7 11 V Switching Frequency 500 kHz Output Ripple Voltage I = 800mA 140 mV LOAD P-P Supply Current I = 0A 5 mA LOAD Shutdown Supply Current I = 0A, V = 0V (Note 3) 100 A LOAD S/S Note 1: The reference voltage tolerance of the LT1371 is 1.6% over Note 3: Single inductor step-up converters have a direct path from the input supply to the output, and therefore draw some supply current even temperature. Output voltage is a worst-case summation of R2, R3 and reference tolerances, plus feedback input current times R3. For a tighter when the LT1371 is in shutdown. Shutdown supply current will also output voltage range, use lower tolerance feedback resistors, or a fixed increase with the addition of an output load. Applications are available that voltage version of the LT1371 (consult Linear Technology Marketing). remove this direct path and reduce shutdown supply current to 30A maximum, independent of loading. Note 2: Increase L1 to 15H for V < 3.3V. IN W U U TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO 12V Output Efficiency Maximum Output Current vs Input Voltage* Component Side 2.50 100 V = 5V IN V = 12V OUT 2.25 90 2.00 1.75 80 1.50 1.25 70 1.00 0.75 60 0.50 50 0.25 0.01 0.1 1 2354 67189 101 OUTPUT CURRENT (A) INPUT VOLTAGE (V) DM093A TA01 DM093A TA02 DC093A BP *INCREASE L1 TO 15H FOR V < 3.3V IN 1 EFFICIENCY (%) MAXIMUM OUTPUT CURRENT (A)DEMO MANUAL DC093 PACKAGE A D SCHE ATIC DIAGRA SM L1 10H 100M E3 V IN C1 22F FRONT VIEW 25V 7 V D1 IN 6 S/S 7 MBRS330 TAB 5 V E4 6 5 E2 SW V IN S/S V SW IS 4 GND S/S V OUT R1 GND 3 NFB U1 53.6K 2 FB LT1371 C4 1/8W 1 2 1 V C V FB 22F C 1% NFB GND TAB 25V R PACKAGE C2 C5 7-LEAD PLASTIC DD 34 8 0.047F R2 22F C2 6.19K LT1371CR 25V 0.0047F 1/8W R3 C6 1% 2K 2.2F 1/8W 1% E2 GND DB093A SCEMATIC Figure 1. Switching Regulator 5V to 12V, 0.25A PARTS LIST REFERENCE DESIGNATOR QUANTITY PART NUMBER DESCRIPTION VENDOR TELEPHONE C1, C4, C5 3 TPSD226M025R0200 22F, 25V, 20%, Tantalum Capacitor AVX (803) 448-9411 C2 1 08055G473MATIA 0.047F, 50V, 20%,Capacitor AVX C3 1 08055G472MATIA 0.0047F, 50V, 20%, Capacitor AVX C6 1 1206YG225ZATMAM 2.2F, 16V, 20%, Capacitor AVX D1 1 MBRS330T3 MBRS330, Diode Motorola (602) 244-5768 E1, E2, E3, E4, E5 4 1502-2 Turret Keystone (718) 950-8900 L1 1 CD104-100MC 10H, Inductor Sumida (708) 956-0666 R1 1 CR215362FT 53.6k, 1/8W, 1%, Resistor AVX R2 1 CR216191FT 6.19k, 1/8W, 1%, Resistor AVX R3 1 CR212001FT 2k, 1/8W, 1%, Resistor AVX U1 1 LT1371CR Switching Regulator IC LTC (408) 432-1900 1 216-40CT Heat Sink, Optional Wakefield Eng. (617) 245-5900 U OPERATIO DC093A Operation Hook-Up This DC093A demonstration board is intended for evalu- Connect the input supply and measurement instruments ating the LT1371 switching regulator in a typical step-up to the V and GND terminals. The S/S pin (synchroniza- IN application. Solid turret terminals are provided for easy tion/shutdown) can be connected to V or left open. IN connection to test equipment. A device pinout and board Connect the output load and measurement instruments to schematic are shown in Figure 1. Please refer to the LT1371 the V and GND terminals. OUT data sheet for additional specifications and applications information. You may find Linear Technologys SwitcherCAD software helpful for creating your own designs. 2 + + + W W U