Microchip MIC5203/05/06/07/16/19 Bedienungsanleitung

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December 1998 1 LDO Regulator Evaluation Board
LDO Regulator Evaluation Board
MIC5203/05/06/07/16/19 LDO Regulators
General Description
This board can be used to evaluate several linear, low-
dropout voltage regulators in the SOT-23-5 package. The
board can accommodate any one of the following parts:
MIC5203
MIC5205
MIC5206
MIC5207
MIC5216
MIC5219
These regulators can be used to generate a well-regulated
voltage from a higher, unregulated dc voltage. Since each
regulator may have dierent features, this board has been
designed to ease the evaluation of any of these features. A
breadboarding area is also included so that further circuitry
can be designed for evaluation with the regulator.
Requirements
The LDO evaluation board requires a power source with a
voltage capability of 20V and at least 500mA of current.
Several digital multimeters will be used to evaluate the
dierent characteristics, as well as an oscilloscope to monitor
input and output waveforms.
Circuit Description
The evaluation board contains a basic circuit with jumpers to
connect dierent portions of the circuit depending on which
device is being evaluated. The MIC5203 in the SOT-23-5
package is a simple LDO that only requires pins 1 3, and–
pin 5 to be used. Pin 4 is a no connect and it is not used. The
xed voltage versions of the MIC5205/5207/5219 have a
noise bypass pin, which can be connected to the circuit for
evaluation through a simple jumper. The MIC5205/5207/
5219 adjustable parts give the user the option to set their own
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
output voltage. By switching the appropriate jumper, the
adjust resistors can be used to set the output voltage. The
bypass capacitor can be used in conjunction with the adjust
resistors to get a low-noise, adjustable output. Finally, the
MIC5206/5216 LDOs have an error ag output that can be
evaluated by using the appropriate jumper as well. The
functionality of each of the jumpers is described in the
Table 1.
The basic circuit contains an input capacitor, an output
capacitor and several other components that can be con-
nected through the jumpers.
Each device can be evaluated for the following characteris-
tics: dropout voltage, ground current, and enable turn-on
characteristics.
Ground Current
With JP2 open, an ammeter can be placed across the jumper
to measure current owing to ground. This places the meter
in series with the ground pin. The meter should be highly
accurate, preferably a 61⁄2 digit meter or better so that the
current can be measured reliably. The input and output
voltages need to be monitored so that the device is not
operating in dropout. The input should be 1V more positive
than the output to measure standard ground current mea-
surements at load. The output voltage will not be the nominal
rated output voltage due to the impedance that is introduced
into the ground lead. This is not important for the evaluation.
The key aspect of this evaluation is the dierential voltage
from input to output. This can be measured by putting a DMM
from input to output. JP2 need to be replaced to continue the
evaluation. (JP1 should be closed for this evaluation. JP3/4/5
may be needed depending on the part number. JP6 can be
left open on all circuits for this evaluation.)
U1
MIC52xx-BM5
IN OUT
GND
V
IN
EN ADJ C2
10ÂľF
35V
CON1
R1 10k
100k
C3
470pF
50V
V
EN
C1
1ÂľF
35V
TP2 TP1
JP1 JP5
JP3
R2
100k
JP4
CON1
J5
J4
CON1
CON1
CON1
GND
J1
J2
J3
VR1
JP2
JP6
Figure 1. Evaluation Board Schematic
LDO Regulator Evaluation Board Micrel
LDO Regulator Evaluation Board 2 December 1998
Enable Characteristics
The enable pin characteristics can be determined by remov-
ing the jumper from JP1 and driving the enable pin with a
power supply or a signal generator. Then, on an oscilloscope,
the output voltage can be monitored relative to the enable
voltage. JP1 can be replaced afterwards to do further mea-
surements.
(JP2 must be closed and JP6 can be left open. JP3/4/5/6 may
be open or closed depending on the part)
Dropout Voltage
Dropout voltage can be measured by using TP1 and TP2.
These test points allow the voltage directly across the pass
transistor to be monitored. DMMs can be used to monitor the
input voltage relative to ground and the output voltage relative
to ground, with a third DMM measuring directly across TP1
and TP2 to measure the dropout voltage. Dropout voltage is
typically dened as the voltage at which the output falls 2%
below the voltage measured at VIN = VOUT + 1V. In other
words, make a measurement of the output voltage relative to
ground when the voltage across the device (TP2-TP1) is 1V.
Then, reduce the input voltage until the output voltage is 2%
below the valued measured at that 1V dierential. At this
point, the voltage measured from TP2 to TP1 is the dropout
voltage. (Close JP1/2 for this evaluation. JP3/4/5/6 can be left
open, depending on the part.)
Error Flag
The error ag feature of the MIC5206/5216 can be evaluated
by connecting jumper JP6 to either the input voltage or output
voltage. The error output of these devices is an open collector
output, therefore, it needs to be connected through a resistor
to a high voltage. The output is active low. When there is a
fault condition resulting in a low voltage output (low input
voltage, or current limit), the transistor turns on and the
collector is pulled to ground. The 100k resistor limits the
current through the transistor. The resistor can be changed,
but care must be taken not to damage the board traces when
it is removed.
Adjustable Output Voltage
The board is equipped with a 10k resistor and a potentiometer
so that an adjustable part can be evaluated for its output
voltage accuracy. The output voltage is set for the MIC5205/
5207/5219 through the following equation:
V 1.242 1 VR1
R1
OUT = +





By connecting JP4 and JP5, the output will then be set to the
desired voltage. The voltage is adjusted by changing VR1.
Because VR1 is a 100k potentiometer, the output voltage is
limited to 13.7V. If a higher output voltage is required, R1 can
be lowered, taking care that the board is not damaged when
the resistor is removed. The minimum recommended output
voltage is 1.8V.
Noise Bypass Capacitor
C3 is a 470pF, 50V NPO ceramic bypass capacitor for
reducing noise on the MIC5205/5207/5219. JP3 connects
this capacitor to the circuit so that the characteristics of those
devices with the noise bypass capacitor attached can be
evaluated.
An area for breadboarding is also included with this evalua-
tion board so that additional testing can be performed. The
holes are connected in horizontal rows for ease of use.
Parts List
Reference Vendor Part Number Description Quantity
U1 Micrel MIC5205 LDO linear regulator 1
MIC5206
MIC5207
MIC5216
MIC5219
C1 AVX TAJA105K035R 1ÂľF, 35V Tantalum 1
C2 AVX TAJA106K035RBJ 10ÂľF, 35V Tantalum 1
C3 Panasonic PCC471CGCT-ND 470pF/50V ceramic 1
R1 1206-size resistor 10k 1% metal lm 1
R2 1206-size resistor 100k 1% metal lm 1
VR1 variable resistor 100k potentiometer 1
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Table 1.
December 1998 3 LDO Regulator Evaluation Board
LDO Regulator Evaluation Board Micrel
Printed Circuit Board Layouts
Component-Side Copper
Component-Side Silk Screen
Solder-Side Copper
Insert the device to be evaluated
in the half of the dual socket
nearest to jumper position JP2.
The half of the socket nearest
to JP1 is not connected.
Figure 2. Active Socket


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Kategorie: Nicht kategorisiert
Modell: MIC5203/05/06/07/16/19

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