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

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Side 1/4

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.)

MIC52xx-BM5

IN OUT

GND

EN ADJ C2

10µF

35V

CON1

R1 10k

100k

470pF

50V

1µF

35V

TP2 TP1

JP1 JP5

JP3

100k

JP4

CON1

GND

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

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 1µF, 35V Tantalum 1

C2 AVX TAJA106K035RBJ 10µF, 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.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC5203/05/06/07/16/19

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