QUICK START GUIDE FOR DC1394A PMIC High Voltage Adaptor Board With 5V Adaptor Inputs DESCRIPTION L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered Demonstration Circuit 1394A is a 38V, 2A, 2.4MHz trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy Drive, FilterCAD, Hot Swap, LinearView, Module, Micropower SwitcherCAD, Multimode Step-Down Switching Regulator with 70A Quiescent Dimming, No Latency , No Latency Delta-Sigma, No R , Operational Filter, PanelProtect, SENSE Current. The LT3480EDD is available in a 10-pin PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names (3mm 3mm) DFN surface mount package. may be trademarks of the companies that manufacture the products. PERFORMANCE SUMMARY Specifications are at T = 25C A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS HVIN High Voltage Input Voltage Range Input disabled from 38-60V 8 60 V 5V ADAPTOR 5V Adaptor Input Voltage Range 4.5 5.5 V HVBUCK Output Voltage Range Range is mode and load dependant 3.5 5.5 V I Output Current 2 A HVBUCK 3. Set Load1 to 2A. Observe that 4.60V < VOUT (VM3) 4.80V. Set Load1 to 0A. QUICK START PROCEDURE The 2A load on VOUT loads HVBUCK, so Using short twisted pair leads for any power the LT3480EDD is supplying 2A. connections, with all loads and power supplies 4. Set PS1 to 38V. Observe that 4.60V < off, refer to Figures 1 & 2 for the proper meas- VOUT (VM3) < 4.80V. The LT3480 is de- urement and equipment setup. signed to operate from HVIN = 8V to 38V. A companion PMIC demo board is required for 5. Set Load1 to 2A. Observe that 4.60V < this check out procedure. The DC1303A VOUT (VM3) < 4.80V. Set Load1 to 0A. (LTC4098EPDC) board is recommended, and The LT3480 is now supplying 2A, while will be used for the following procedure. operating from 38V. Please refer to the DC1303A Quick Start Guide for further information. 6. Set COMP jumper (JP2) to REMOTE. Observe that 3.80V < VOUT (VM3) < Follow the procedure below: 4.10V. The LTC4098EPDC is now control- 1. Set PS1 to 8V, PS2 to 0V, and PS3 to ling the LT3480 output voltage to approxi- 3.6V. Set Load1 to 0A. Ensure that jump- mately V(BAT) + 0.3V. ers are configured as per Figure 1, except 7. Set Load1 to 2A. Observe that 3.80V < the D2 jumper (JP3) on the DC1303A VOUT (VM3) < 4.10V. Set Load1 to 0A. should be set to 1. LT3480 is supplying 2A, while under 2. Observe that 4.60V < VOUT (VM3) < LTC4098 control. 4.80V. The LT3480 HV Buck regulator is 8. Set PS1 to 8V. Observe that 3.80V < running with its control loop closed locally. VOUT (VM3) < 4.10V. The nominal HVBUCK voltage is 4.75V, and the LTC4098EPDC on the DC1303A board has connected HVBUCK to VOUT. 1 9. Set Load1 to 2A. Observe that 3.80V < (VM3) < 4.10V. Set Load1 to 0A. 10. Set PS2 to 4.5V, and WALL jumper (JP3) to 5V ADAPTOR. Observe that 4.40 < VOUT (VM3) < 4.50V. The LT3480 is not supplying power to VOUT. This verifies that the LTC4098 recognizes the 5V Ada- pator input, and connects it to VOUT. 11. Set Load1 to 1A. Observe that 4.40V < VOUT (VM3) < 4.50V. Set Load1 to 0A. 12. Set PS2 to 5.5V. Observe that 5.40V < VOUT (VM3) < 5.50V. 13. Set Load1 to 1A. Observe that 5.40V < VOUT (VM3) < 5.50V. 2