DC437A - Demo Manual

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
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