QUICK START GUIDE FOR LT3505EDD DC1395A LT3505EDD: PMIC High Voltage Adaptor Board with 5 Volt Adaptor Inputs DESCRIPTION Demonstration Circuit 1395A is a 1.2A, Step-Down Switching Regulator in a 3mm × 3mm DFN. The LT3505EDD is available in an 8-pin (3mm × 3mm) DFN surface mount package. L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode Dimming, No Latency ΔΣ, No Latency Delta-Sigma, No RSENSE, Operational Filter, PanelProtect, PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names may be trademarks of the companies that manufacture the products. PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL HVIN 5V ADAPTOR HVBUCK IHVBUCK PARAMETER High Voltage Input Voltage Range 5V Adaptor Input Voltage Range Output Voltage Range Output Current CONDITIONS Input disabled from 36-40V Range is mode and load dependant QUICK START PROCEDURE MIN 8 4.5 3.5 TYP MAX 40 5.5 5.5 2 UNITS V V V A LTC4098EPDC on the DC1303A board has connected HVBUCK to VOUT. Using short twisted pair leads for any power connections, with all loads and power supplies off, refer to Figures 1 & 2 for the proper measurement and equipment setup. 3. Set Load1 to 1A. Observe that 4.35V < VOUT (VM3) 4.55V. Set Load1 to 0A. The 1A load on VOUT loads HVBUCK, so the LT3505EDD is supplying 1A. A companion PMIC demo board is required for this check out procedure. The DC1303A (LTC4098EPDC) board is recommended, and will be used for the following procedure. Please refer to the DC1303A Quick Start Guide for further information. 4. Set PS1 to 36V. Observe that 4.50V < VOUT (VM3) < 4.70V. The LT3505 is designed to operate from HVIN = 8V to 36V. Follow the procedure below: 6. Set “COMP” jumper (JP2) to “REMOTE”. Observe that 3.80V < VOUT (VM3) < 4.10V. The LTC4098EPDC is now controlling the LT3505 output voltage to approximately V(BAT) + 0.3V. 1. Set PS1 to 8V, PS2 to 0V, and PS3 to 3.6V. Set Load1 to 0A. Ensure that jumpers are configured as per Figure 1, except the “D2” jumper (JP3) on the DC1303A should be set to “1”. 2. Observe that 4.50V < VOUT (VM3) < 4.70V. The LT3480 HV Buck regulator is running with its control loop closed locally. The nominal HVBUCK voltage is 4.75V, and the 1 5. Set Load1 to 1A. Observe that 4.20V < VOUT (VM3) < 4.55V. Set Load1 to 0A. The LT3505 is now supplying 1A, while operating from 38V. 7. Set Load1 to 1A. Observe that 3.70V < VOUT (VM3) < 3.90V. Set Load1 to 0A. LT3505 is supplying 1A, while under LTC4098 control. 8. Set PS1 to 8V. Observe that 3.80V < VOUT (VM3) < 4.10V. 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 LT3505EDD - + PS1 + 0V-40V supply 1A - VM1 - + PS2 + 0V-6V supply 2A - + AM1 AM2 + VM2 - D2 D1 D0 AM3 - + + + VM3 - - Load 1 0V-5V 5A AM4 + - + VM4 - 3.6Ω + - VM6 Note: All connections from equipment should be Kelvin connected directly to the Board PINS which they are connected to on this diagram and any input, or output, leads should be twisted pair Figure 1. Proper Measurement Equipment Setup for DC1395A GND VIN Figure 2. Measuring Input or Output Ripple 3 PS3 0V-5V supply 2A LT3505EDD Figure 3. DC1395A Schematic 4 LT3505EDD Figure 4. DC1395A BOM 5