DEMO MANUAL DC2177A-A LT3061 45V VIN, Micropower, Low Noise, 100mA LDO with Output Discharge Description Demonstration circuit 2177A-A features the LT®3061, a micropower, low noise and low dropout voltage linear regulator with output discharge. The input voltage ranges from 2.1V to 45V and the maximum output current is 100mA. A resistor divider determines the output voltage, and a jumper adjusts the divider to set the output voltage to either 1.2V, 1.5V, 1.8V, 2V, 2.5V, 3.3V, 5V or a voltage that is user-programmed but requires the installation of a resistor. The output uses a 10µF ceramic capacitor and the internal reference is bypassed with a 10nF capacitor to reduce output noise and program the soft-start. There is also a 10nF feedforward capacitor to improve load transient response and decrease noise at higher output voltages. The position of the VOUTEN jumper either pulls up the SHDN pin to the input supply through a 100k resistor, shorts SHDN to ground or floats the SHDN pin so it can be driven directly by a signal applied to the SHDN terminal. The input supply to the LT3061 is bypassed by a 2.2µF ceramic capacitor and there is also a 50V tantalum Performance Summary polymer capacitor on the input to dampen ringing that may occur when the input is hot-plugged using long leads. The LT3061 saves energy by being micropower and low dropout. The LT3061 has excellent regulation and fast response to load transients and also tolerates wide input voltage variations and discharges its output in a controlled manner as required by some image sensor loads. The LT3061 targets systems with inputs that are batterypowered or have multiple sources, especially those with sensitive loads. DC2177A-A features the LT3061 in the 8-lead 2mm × 3mm DFN package. The LT3061 data sheet must be read in conjunction with this demo manual to properly use or modify demo circuit DC2177A-A. Design files for this circuit board are available at http://www.linear.com/demo/DC2177A-A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETER CONDITIONS Minimum Input Voltage, VIN VIN – VOUT ≥ 290mV MIN TYP MAX 2.1 45 Maximum Input Voltage, VIN Output Voltage, VOUT VOUT SELECT = 1.2V VOUT SELECT = 1.5V VOUT SELECT = 1.8V VOUT SELECT = 2V VOUT SELECT = 2.5V VOUT SELECT = 3.3V VOUT SELECT = 5V 1.17 1.47 1.76 1.97 2.43 3.23 4.85 Maximum Output Current, IOUT VIN = 2.2V, VOUT = 1.8V 100 Output Discharge Time VOUT = 2.9V, COUT = 10µF UNITS V V 1.2 1.5 1.8 2.0 2.5 3.3 5.0 1.23 1.54 1.85 2.07 2.56 3.41 5.13 V V V V V V V mA 750 µs dc2177aaf 1 DEMO MANUAL DC2177A-A Quick Start Procedure To use DC2177A-A to evaluate the performance of the LT3061, refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: 1.With the input supply and load off and turned down, make all connections according to Figure 1. Make sure the jumper to set VOUT is in the proper position for the desired output voltage and the VOUTEN jumper is in the ON position. 2.Turn on the input supplies and increase them to the desired input voltages. 3.Increase the load to the desired output current. Verify that the VOUT voltage is as programmed by the jumper. Note: If the output voltage is low, temporarily disconnect the load to make sure that it is not set too high. 4.Once the proper output voltage is established, adjust the input voltage and load within the operating range and observe the output voltage regulation, low quiescent current, shutdown, output discharge operation and other parameters. Note When Setting The Input Voltage: An input voltage that is too close to the programmed output voltage (too low) may cause dropout operation and a loss of output voltage regulation. Also, an input voltage that is too high above the output may increase power dissipation to an unacceptable level. 2 dc2177aaf DEMO MANUAL DC2177A-A Quick Start Procedure Figure 1. Proper Measurement Equipment Setup for DC2177A-A dc2177aaf 3 DEMO MANUAL DC2177A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 Cap., X5R 2.2µF 50V 10% 1206 Murata GRM31CR61H225KA88K 2 1 C2 Cap., X7R 10µF 25V 20% 1206 TDK C3216X7R1E106MT 3 2 R1, R2 Res., Chip 60.4k 0.06W 1% 0402 Vishay CRCW040260K4FKED 4 1 U1 I.C., Low Dropout Reg. DFN(08)(DCB)2MMX3MM Linear Tech. Corp. LT3061EDCB Optional Demo Circuit Components 1 2 C3, C4 Cap., X7R 0.01µF 25V 10% 0603 AVX 06033C103KAT2A 2 1 C5 Cap., Tant. Polymer 10µF 50V 20% 7343 AVX TCJD106M050R0120 3 0 C6 (Opt) Cap., 0805 4 0 C7 (Opt) Cap., 7343 5 1 R3 Res., Chip 90.9k 0.06W 1% 0402 Vishay CRCW040290K9FKED 6 1 R4 Res., Chip 121k 0.06W 1% 0402 Vishay CRCW0402121KFKED 7 1 R5 Res., Chip 143k 0.06W 1% 0402 Vishay CRCW0402143KFKED 8 1 R6 Res., Chip 191k 0.06W 1% 0402 Vishay CRCW0402191KFKED 9 1 R7 Res., Chip 274k 0.06W 1% 0402 Vishay CRCW0402274KFKED 10 1 R8 Res., Chip 442k 0.06W 1% 0402 Vishay CRCW0402442KFKED 11 0 R9 (Opt) Res., 0603 12 1 R10 Res., Chip 100k 0.06W 5% 0603 Vishay CRCW0603100KJNEA Hardware 1 5 E1, E2, E3, E4, E5 Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0 2 1 JP1 Headers, 2 x 8 (2mm Ctrs.) Sullins NRPN082PAEN-RC 3 1 JP2 Headers, 4 Pins 2mm Ctrs. Sullins NRPN041PAEN-RC 4 2 XJP1, XJP2 Shunt, 2mm Ctrs. Samtec 2SN-BK-G 4 dc2177aaf VIN E2 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 1 C5 + 10µF 50V 7343 C6 (Opt) 0805 R10 100k 5% 0603 C1 2.2µF 50V 1206 7 5 6 9 GND SHDN IN IN 8 NOTES: UNLESS OTHERWISE SPECIFIED: 1. RESISTORS ARE 0402 1%, CAPACITORS ARE 06O3. ADJ OUT OUT 1 2 3 4 C3 0.01µF GND REF/BYP U1 LT3061EDCB PERFORMANCE SUMMARY FOR * SEE MINIMUM INPUT VOLTAGE CONDITIONS SHDN 4 EXT E5 3 OFF JP2 2 ON VOUTEN GND E4 2.1V - 45V * R1 60.4k C4 0.01µF (Opt) 0603 R9 442k R8 274k R7 191k R6 143k R5 121k R4 90.9K R3 60.4k R2 JP1 14 16 15 12 11 13 10 8 6 4 2 9 7 5 3 1 C2 10µF 25V 1206 USER SELECT 5.0V 3.3V 2.5V 2.0V 1.8V 1.5V 1.2V VOUT C7 (Opt) 7343 + E3 E1 VOUT GND 100mA DEMO MANUAL DC2177A-A Schematic Diagram dc2177aaf 5 DEMO MANUAL DC2177A-A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 6 dc2177aaf Linear Technology Corporation LT 0714 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014