DEMO MANUAL DC140 DESIGN-READY SWITCHERS LTC1436-PLL 2-Output Synchronous Buck Converter with Versatile Frequency Controller DESCRIPTIO Demonstration circuit DC140 is a 2-output, general pur- DC140 is intended for users with noise-sensitive applica- pose evaluation platform intended to demonstrate the tions where conducted and radiated emissions are impor- many functions of the LTC 1436-PLL and to make it easy tant design considerations. These applications include to implement circuit changes. The switching frequency of radio, cell-phone and other wireless communication prod- the LTC1436-PLL can be synchronized to an external ucts. Two versions of DC140 are available they differ only clock frequency or modulated to reduce EMI by decreas- in the magnitude of the second output voltage. Both ing the average power of the switching harmonics. The versions provide 5V at 3A on the main output. The second high efficiency, constant-frequency advantages of the output is derived from the main 5V output and postregulated TM Adaptive Power output stage can be observed under by an internal auxiliary linear regulator. Version A pro- light load conditions. The enable and soft start features of vides a second output voltage of 3.3V at 0.1A, whereas the LTC1436-PLL can also be observed, along with a version B provides a second output of 12V at 0.1A. power-on reset (POR) signal for the main output. , LTC and LT are registered trademarks of Linear Technology Corporation. Adaptive Power is a trademark of Linear Technology Corporation. PERFOR A CE SU ARY Operating Temperature Range 0C to 50C PARAMETER CONDITIONS VALUE Input Voltage Range Maximum Input Voltage (Limited by External MOSFETs) 5.5V to 28V Output Voltage Main Output, 5V 4.9V to 5.1V 3.3V Output (Version A) 3.13V to 3.47V 12V Output (Version B) 11.4V to 12.6V W U U TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO Efficiency Component Side 100 CONTINUOUS 95 INDUCTOR CURRENT 90 85 TRANSITION 80 REGION 75 70 65 ADAPTIVE 60 V = 10V IN POWER MODE V = 5V 55 O f 170kHz 50 1 10 100 1A 3.2A LOAD CURRENT (mA) DC140 TA01 1 EFFICIENCY (%) WW U W UDEMO MANUAL DC140 DESIGN-READY SWITCHERS Operating Temperature Range 0C to 50C PERFOR A CE SU ARY PARAMETER CONDITIONS VALUE Output Voltage Ripple 5V Output, 3A Load, 10MHz Bandwidth Limited 60mV P-P 3.3V Output, 0.1A Load, 10MHz Bandwidth Limited 20mV P-P 12V Output, 0.1A Load, 10MHz Bandwidth Limited 20mV P-P Line Regulation V = 6V to 20V, 5V Output 5mV IN Load Regulation I = 0A to 3A, 5V Output 40mV O Frequency Typical Free-Running Frequency, C = 68pF 170kHz OSC Supply Current Typical, V = 15V, Both Outputs On (No Load) 320A IN Shutdown Current Typical, V = 15V, RUN/SS = 0V 16A IN W PACKAGE DIAGRA TOP VIEW PLL LPF 1 24 PLLIN C 2 23 POR OSC RUN/SS 3 22 BOOST I 4 21 TGL TH SFB 5 20 SW SGND 6 19 TGS V 7 18 V PROG IN V 8 17 INTV OSENSE CC SENSE 9 16 BG + SENSE 10 15 PGND AUXON 11 14 EXTV CC AUXFB 12 13 AUXDR GN PACKAGE 24-LEAD PLASTIC SSOP (150 MIL SSOP) LTC1436CGN-PLL 2 WW U W