QUICK START GUIDE FOR LT3505EDD DC1395A LT3505EDD: PMIC High Voltage Adaptor Board with 5 Volt Adaptor Inputs DESCRIPTION L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered Demonstration Circuit 1395A is a 1.2A, Step-Down trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy Drive, FilterCAD, Hot Swap, LinearView, Module, Micropower SwitcherCAD, Multimode Switching Regulator in a 3mm 3mm DFN. The Dimming, No Latency , No Latency Delta-Sigma, No R , Operational Filter, PanelProtect, SENSE LT3505EDD is available in an 8-pin (3mm 3mm) PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names 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 36-40V 8 40 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 LTC4098EPDC on the DC1303A board has con- QUICK START PROCEDURE nected HVBUCK to VOUT. 3. Set Load1 to 1A. Observe that 4.35V < VOUT Using short twisted pair leads for any power con- (VM3) 4.55V. Set Load1 to 0A. The 1A load on nections, with all loads and power supplies off, refer VOUT loads HVBUCK, so the LT3505EDD is to Figures 1 & 2 for the proper measurement and supplying 1A. equipment setup. 4. Set PS1 to 36V. Observe that 4.50V < VOUT A companion PMIC demo board is required for this (VM3) < 4.70V. The LT3505 is designed to op- check out procedure. The DC1303A erate from HVIN = 8V to 36V. (LTC4098EPDC) board is recommended, and will be used for the following procedure. Please refer to 5. Set Load1 to 1A. Observe that 4.20V < VOUT the DC1303A Quick Start Guide for further informa- (VM3) < 4.55V. Set Load1 to 0A. The LT3505 tion. is now supplying 1A, while operating from 38V. Follow the procedure below: 6. Set COMP jumper (JP2) to REMOTE. Ob- serve that 3.80V < VOUT (VM3) < 4.10V. The 1. Set PS1 to 8V, PS2 to 0V, and PS3 to 3.6V. Set LTC4098EPDC is now controlling the LT3505 Load1 to 0A. Ensure that jumpers are config- output voltage to approximately V(BAT) + 0.3V. ured as per Figure 1, except the D2 jumper (JP3) on the DC1303A should be set to 1. 7. Set Load1 to 1A. Observe that 3.70V < VOUT (VM3) < 3.90V. Set Load1 to 0A. LT3505 is 2. Observe that 4.50V < VOUT (VM3) < 4.70V. The supplying 1A, while under LTC4098 control. LT3480 HV Buck regulator is running with its control loop closed locally. The nominal 8. Set PS1 to 8V. Observe that 3.80V < VOUT HVBUCK voltage is 4.75V, and the (VM3) < 4.10V. 1 LT3505EDD 9. Set Load1 to 1A. Observe that 3.70V < (VM3) < 3.90V. 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 LT3505 is not supplying power to VOUT. This verifies that the LTC4098 recognizes the 5V Adaptor input, and connects it to VOUT. 11. Set Load1 to 1A. Observe that 4.10V < VOUT (VM3) < 4.40V. 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 5.10V < VOUT (VM3) < 5.50V. 2