DEMO BOARD QUICK START GUIDE DC437 LOW DROPOUT LINEAR REGULATOR LT1964 DESCRIPTION Demonstration circuit DC437 is a low noise negative micropower voltage regulator using the LT1964 low dropout linear regulator, which comes in a tiny 5-Pin SOT-23 package. The DC437 has an input voltage range from –2.3V to –20V, and is capable of delivering 200mA max. With the small size of the LT1964, plus its ability to maintain a stable output (no oscillations) with ceramic output capacitors, the DC437 voltage regulator is ideally suited for hand-held applications, such as cellular phones or PDAs. There are two circuits on this demo board. When looking at the board right-side up (the title is at the top of the board): • the upper circuit is a regulator that uses the LT1964ES5-BYP • the lower circuit is a regulator that uses the LT1964ES5-SD. Gerber files for this circuit are available. Call the LTC Factory. QUICK START PROCEDURE position also allows a user selectable output voltage with the installation of R3. The DC437 demonstration board is easy to set up to evaluate the performance of the LT1964 negative micropower LDO regulator. Refer to Figure 1 for the connection diagram and follow the procedures below: NOTE Be careful when you connect the test equipment to the board. Remember, ground (Gnd) is the most positive potential on the board, and Vin is the most negative potential. Thus, current flows from Gnd to Vout and Vin, and from Vout to Vin. Set up the circuit appropriately. EVALUATING THE LT1964ES5-SD (LOWER CIRCUIT) 1. Connect the input power supply to the Vin and GND terminals on the left-side of the board. 2. Connect the load between the Vout and GND terminals on the right-side of the board. 3. To start the circuit, insert a jumper into the upper position of JP2. 4. Select the desired output voltage using JP3. To select an output voltage of –1.22V, insert the jumper into the lower position. Inserting the jumper into the upper position forces the output to –5V. The upper position also allows a user selectable output voltage with the installation of R6. 5. To shut down the circuit, connect the SHDN pin to ground by inserting a jumper into the lower position of JP2. Do not leave this pin floating. EVALUATING THE LT1964ES5-BYP (UPPER CIRCUIT) 1. Connect the input power supply to the Vin and GND terminals on the left-side of the board. 2. Connect the load between the Vout and GND terminals on the right-side of the board. 3. Select the desired output voltage using JP1. To select an output voltage of –1.22V, insert the jumper into the lower position. Inserting the jumper into the upper position forces the output to –5V. The upper 1 DEMO BOARD QUICK START GUIDE DC437 LOW DROPOUT LINEAR REGULATOR + – + + + – + – – LOAD – + – + – + + + – + – – LOAD – + – Figure 1. Proper Measurement Equipment Setup 2 1 2 REVISION HISTORY LTC CONFIDENTIAL - For Customer Use Only ECO REV 0 DESCRIPTION DATE PROTO 2 09-19-01 APPROVED > A A GND TP3 1 1 GND TP4 R1 249K 1% C1 1uF C2 10uF 1 ADJ TP1 1 2 IN OUT 3 R3 USER SELECT 2 -5V/USER SELECT -1.22V JP1 5 10V 1 R2 768K 1% C3 BYP Vin 4 0.01uF 1 3 U1 GND 25V -5.4 TO -20V Vout TP2 200mA (max) LT1964ES5-BYP B UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 THIRD ANGLE PROJECTION B CONTRACT NO. APPROVALS DRAWN MEI CHECKED DATE TECHNOLOGY 06-05-01TITLE APPROVED ENGINEER DESIGNER SIZE LT1964 NEGATIVE LOW NOISE LDO REGULATOR 200mA CAGE CODE DWG NO 1 Wednesday, September 26, 2001 SCALE: NONE REV 2 DC437A A DO NOT SCALE DRAWING 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 FILENAME: 437A-2.PCB 2 SHEET 1 OF 2 1 2 REVISION HISTORY ECO REV 0 DESCRIPTION DATE PROTO 2 09-19-01 APPROVED > A A GND TP7 1 1 OFF 2 3 /SD ADJ R5 768K 1% R6 USER SELECT 1 -1.22V JP3 3 Vin TP5 4 10V -5V/USER SELECT 2 1 ON C5 10uF 1 U2 JP2 GND 25V 3 C4 1uF TP8 R4 249K 1% 1 R7 4.7M GND 2 IN OUT 5 1 -5.4 TO -20V Vout TP6 200mA (max) LT1964ES5-SD SHDN TP9 B 1 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 THIRD ANGLE PROJECTION B CONTRACT NO. APPROVALS DRAWN MEI CHECKED DATE TECHNOLOGY 06-13-01TITLE APPROVED ENGINEER DESIGNER SIZE LT1964 NEGATIVE LOW NOISE LDO REGULATOR 200mA CAGE CODE DWG NO 1 Wednesday, September 26, 2001 SCALE: NONE REV 2 DC437A-2 A DO NOT SCALE DRAWING 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 FILENAME: 437A-2.PCB 2 SHEET 2 OF 2 LINEAR TECHNOLOGY CORPORATION LT1964ES5 Item 1 2 3 4 5 6 7 8 9 10 11 Qty 2 2 1 3 2 2 0 1 9 1 1 Ref C1,C4 C2,C5 C3 JP1,JP2,JP3 R1,R4 R2,R5 R3,R6 (OPT) R7 TP1-TP9 U1 U2 BILLS OF MATERIAL Desc CAP,X7R 1uF 25V 20% 1206 CAP,X7R 10uF 10V 20% 1210 CAP,X7R 0.01uF 16V 5% 0402 HEADER,3 PINS 2mm RES,249K OHM 1% 1/16W 0402 RES,768K OHM 1% 1/16W 0603 DO NOT STUFF RES,4.7MEG OHM 5% 1/16W 0402 TURRET IC,LT1964ES5-BYP LOW NOISE NEGATIVE REGULATOR IC,LT1964ES5-SD LOW NOISE NEGATIVE REGULATOR DC437A REV 2 9/26/01 Part Number TAIYO YUDEN TMK316BJ105ML TAIYO YUDEN LMK325BJ106MN-T AVX 0402YC103JAT2A COMM 2802S-03G2 AAC CR05-2493FM AAC CR16-7683FM OPTION AAC CR05-474JM MILL MAX2501-2 LT1964ES5-BYP LT1964ES5-SD