DEMO MANUAL DC1601B LTM4607EV High Efficiency PolyPhase Buck-Boost Power Supply DESCRIPTION Demonstration circuit DC1601B is a PolyPhase power phases to minimize input and output ripple. An internal supply featuring the LTM 4607 power module, a complete phase-locked loop allows the LTM4607 to be synchro- high efficiency switching mode buck-boost power supply. nized to an external clock within the range of 200kHz to The DC1601B input voltage range is from 6V to 36V and 400kHz. The LTM4607 default switching frequency on the is capable of delivering high power through paralleled DC1601B is set to 300kHz through the onboard LTC6902 LTM4607 modules. The demo circuit can deliver up to 10A clock generator which interleaves the paralleled phases. of output current for two paralleled modules (DC1601B-A), The frequency and phase separation set by the LTC6902 15A for three paralleled modules (DC1601B-B) and up are resistor programmable. to 20A for four paralleled modules (DC1601B-C). The These features, including the availability of the LTM4607 in DC1601B demonstrates that paralleling modules is easy a compact thermally enhanced 15mm 15mm 2.8mm and reliable. LGA package make the demonstration circuit ideal for The output voltage for the board is 12V. The rated load use in high density point of load regulation applications. current per module is 5A in boost mode, however cur- Design files for this circuit board are available at rent derating may be necessary under certain V , V , IN OUT DEMO MANUAL DC1601B PERFORMANCE SUMMARY (T = 25C) A PARAMETER CONDITIONS VALUE Maximum Input Voltage 36V Minimum Input Voltage 6V Output Voltage V Programmed by R22 12V OUT Maximum Continuous Output Current I Current Derating May Be Necessary for 10A (DC1601B-A) OUT(MAX) Certain V , V , Frequency and Thermal 15A (DC1601B-B) IN OUT Conditions. 20A (DC1601B-C) Default Operating Frequency 300kHz External Clock Sync. Frequency Range 200kHz to 400kHz Output Voltage Ripple (Typical) V = 12V V = 9V, I = 10A (DC1601B-A), See Figure 5a OUT IN OUT 300kHz (20MHz BW) V = 12V, I = 15A (DC1601B-B), See Figure 5b IN OUT V = 32V, I = 20A (DC1601B-B), See Figure 5c IN OUT Efficiency V = 9V, V = 12V 95.7% at I = 10A (DC1601B-A), See Figure 2a IN OUT OUT 300kHz 94.8% at I = 15A (DC1601B-B), See Figure 2b OUT 94.8% at I = 20A (DC1601B-C), See Figure 2c OUT Load Transient V = 12V V = 9V, I = 10A (DC1601B-A), See Figure 4a OUT IN OUT 300kHz (20MHz BW) V = 12V, I = 15A (DC1601B-B), See Figure 4b IN OUT V = 32V, I = 20A (DC1601B-B), See Figure 4c IN OUT dc1601bf 2