Datasheet CS8147YTVA5, CS8147YTHA5, CS8147YT5 Datasheet (Cherry Semiconductor)

■ Two Regulated Outputs

10V ± 5%; 500 mA

5V ± 3%; 70 mA

■ 70µA SLEEP Mode Current

■ Inherently Stable

Secondary Output
(No Output Capacitor

Required)

■ Fault Protection

Overvoltage Shutdown
Reverse Battery
60V Peak Transient

-50V Reverse Transient
Short Circuit
Thermal Shutdown

■ CMOS Compatible

Input with Low

(I

OUT(max)

) Input Current.

ENABLE

1

Features

Package Options

5 Lead TO-220

Tab (Gnd)

1

CS8147

10V/5V Low Dropout Dual Regulator

with

ENABLE

CS8147

Description

Block Diagram

Absolute Maximum Ratings

Input Voltage (V

IN

)

DC .............................................................................................-18V to 26V

Positive Peak Transient Voltage

(46V Load Dump @ VIN= 14V) .......................................................60V

Negative Peak Transient Voltage ......................................................-50V

ESD (Human Body Model) ...........................................................................2kV

Input...................................................................................-0.3 to 10V

Internal Power Dissipation..................................................Internally Limited

Junction Temperature Range...................................................-40¡C to +150¡C

Storage Temperature Range ....................................................-65¡C to +150¡C

Lead Temperature Soldering

Wave Solder (through hole styles only)..........10 sec. max, 260¡C peak

ENABLE

The CS8147 is a 10V/5V dual out­put linear regulator. The 10V ±.5%
output sources 500mA and the 5V
±3% output sources 70mA. The
secondary output is inherently sta­ble and does not require an external
capacitor.

The on board function
controls the regulatorÕs two out­puts. When is high, the
regulator is placed in SLEEP mode.
Both outputs are disabled and the

regulator draws only 70µA of qui­escent current.

The regulator is protected against
overvoltage conditions. Both out­puts are protected against short
circuit and thermal runaway
conditions.

The CS8147 is packaged in a 5 lead
TO-220 with copper tab. The cop­per tab can be connected to a heat
sink if necessary.

ENABLE

ENABLE

1
2 V

IN

3 Gnd
4V

OUT1

(10V)

5V

OUT2

(5V)

ENABLE

A Company

¨

Rev. 4/5/99

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

V

IN

ENABLE

­Pre-Regulator

+

Primary Output

Over Voltage

Shutdown

+

-

Anti-saturation

and

Current Limit

V

OUT1

Gnd

Bandgap

Reference

Thermal

Shutdown

Secondary Output

-

+

Current Limit

V

OUT2

2

CS8147

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Electrical Characteristics for V

OUT

: VIN= 14V, I

OUT1

= I

OUT2

= 5mA, -40¡C < TJ< 150¡C, -40¡C ² TA² 125ûC,

= LOW; unless otherwise specified.

ENABLE

Package Lead Description

PACKAGE LEAD # LEAD SYMBOL FUNCTION

5 Lead TO-220

1 CMOS compatible input lead; switches V

OUT1

and V

OUT2

on

and off. When is low, V

OUT1

and V

OUT2

are active.

2V

IN

Supply voltage, usually direct from battery.
3 Gnd Ground connection.
4V

OUT1

Regulated output 10V, 500mA (typ)
5V

OUT2

Secondary output 5V, 70mA (typ).

ENABLE

ENABLE

■ Primary Output (V

OUT1

)

Output Voltage 13V ² V

IN

² 26V, I

OUT1

² 500mA, 9.50 10.00 10.50 V

Dropout Voltage I

OUT1

= 500mA 0.5 0.7 V

Line Regulation 11V ² V

IN

² 18V, I

OUT1

= 250mA 45 90 mV

Load Regulation 5mA ² I

OUT1

² 500mA 15 75 mV

Quiescent Current I

OUT1

² 1mA, No Load on V

OUT2

, V

IN

= 18V 3 7 mA

I

OUT1

= 500mA, No Load on V

OUT2

, V

IN

= 11V 60 120 mA

Quiescent Current = HIGH 70 200 µA

V

OUT1,VOUT2

= OFF
Current Limit 0.55 0.80 A
Long Term Stability 50 mV/khr
Over Voltage Shutdown V

OUT1

and V

OUT2

32 36 40 V

■ Secondary Output (V

OUT2

)

Output Voltage 6V ² V

IN

² 26V, 1mA ² I

OUT2

² 70mA 4.85 5.00 5.15 V

Dropout Voltage I

OUT2

² 70mA 1.5 2.5 V

Line Regulation 11 ² V

IN

² 18V, I

OUT

= 70µA 4 50 mV

Load Regulation 1mA ² I

OUT2

² 70mA, V

IN

= 14V 10 50 mV

Current Limit 150 mA

■ Function ( )

Input Threshold V

OUT2(ON)

1.40 2.50 V

V

OUT1(OFF)

.8 1.40 V

Input Current Input Voltage Range 0 to 5V -10 10 µA

ENABLE

ENABLE

ENABLE

ENABLE

ENABLE

3

Typical Performance Characteristics

Output Current (mA)

Dropout Voltage (mV), V

OUT

1

0 50 100 150 200 300 350 400 450 500 550 600250

0

50

100

150

200

250

300

350

400

450

500

550

600

125°C

25°C

-40°C

Dropout Voltage vs. Output Current (V

OUT1

)

Output Current (mA) V

OUT2

(5V)

Dropout Voltage (V), V

OUT

2

0

10

0

0.20

125°C

25°C

-40°C

20 30 40 50 60 70 80 90 100

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

2.00

VIN = 6.00V

Output Current (mA)

Quiescent Current (mA)

0 50 100 150 200 300 350 400 450 500 550 600250

0

10

100

20

30

40

50

60

70

80

90

125°C

25°C

-40°C

V

IN

= 14V

Output Current (mA), V

OUT2

(5V)

Quiescent Current (mA)

0

10

0

1

125°C

25°C

-40°C

20 30 40 50 60 70 80 90 100

2

3

4

5

6

7

V

IN

= 14V

Quiescent Current vs. Output Current (V

OUT2

)

Quiescent Current vs. Output Current (V

OUT1

)

Dropout Voltage vs. Output Current (V

OUT2

)

Temp (C°)

PART1 V

IN

=14V, RLOAD=0

V

OUT

(Volts)

-50

4.98

4.99

5.00

5.01

5.02

-40 -30 -20 -10 0 10 20 30 40 50 60 80 90 100 110 120 13070 140

Output Current (mA), V

OUT

1

(10V)

Line Regulation (mV)

0 50 100 150 200 300 350 400 450 500 550 600250

0

10

100

20

30

40

50

60

70

80

90

-40°C

110

120

125°C

V

IN

= 11V - 26V

25°C

Line Regulation vs. Output Current (V

OUT1

)

V

OUT

2

vs. Temperature

CS8147

4

Typical Performance Characteristics

Output Current (mA), V

OUT

1

(10V)

Load Regulation (mV)

0 50

100

150 200 300 350 400 450 500 550 600250

-10

-6

22

-2

2

6

10

14

18

125°C

25°C

-40°C

26

30

VIN = 14V

Load Regulation vs. Output Current (V

OUT1

)

Output Current (mA), V

OUT

2

(5V)

Load Regulation (mV)

0

10

0

1

20 30 40 50 60 70 80 90 100

2

3

8

4

5

6

7

9

10

V

IN

= 14V

-40°C

25°C

125°C

Load Regulation vs. Output Current (V

OUT2

)

V

ENABLE

1.000/div (V)

I

ENABLE

(mA)

-1.000

0

-100.0

9.000

20.00
/div

0

100.0

ENABLE Input Current vs. Input Voltage

-40ûC

25ûC

V10 = 500mA Load
V5 = 70mA Load

350

300

250

200

150

100

50

0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

V

IN

(V)

ICQ

(mA)

125ûC

0

1 2 3 4 5 6 7 8 9 101112131415

0

50

100

150

200

250

300

ICQ (mA)

VIN (V)

V

OUT

1

= 500mA Load

V

OUT

2

= 100mA Load

V10 = 500mA Load
V5 = No Load

V

OUT

1

= No Load

V

OUT

2

= No Load

Quiescent Current (ICQ) vs. V

IN

over R

LOAD

TEMP (°C)

V

OUT

(V)

-50

-30

9.975

9.980

-10 10 30 50 70 90 110 130 150

9.985

9.990

9.995

10.000

10.005

10.010

10.015

10.020

10.025

VIN = 14V
IO = 30mA

V

OUT1

vs. Temperature

Quiescent Current (ICQ) vs. V

IN

over Temperature

CS8147

5

Definition of Terms

Typical Circuit Waveform

Test & Applications Circuit

Dropout Voltage: The input-output voltage differential at which

the circuit ceases to regulate against further reduction
in input voltage. Measured when the output voltage
has dropped 100mV from the nominal value obtained
at 14V input, dropout voltage is dependent upon load
current and junction temperature.

Current Limit: Peak current that can be delivered to the output.

Input Voltage: The DC voltage applied to the input terminals

with respect to ground.

Input Output Differential: The voltage difference between the

unregulated input voltage and the regulated output
voltage for which the regulator will operate.

Line Regulation: The change in output voltage for a change in

the input voltage. The measurement is made under
conditions of low dissipation or by using pulse tech­niques such that the average chip temperature is not
significantly affected.

Load Regulation: The change in output voltage for a change in

load current at constant chip temperature.

Long Term Stability: Output voltage stability under accelerated

life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.

Output Noise Voltage: The rms AC voltage at the output, with

constant load and no input ripple, measured over a
specified frequency range.

Quiescent Current: The part of the positive input current that

does not contribute to the positive load current. The
regulator ground lead current.

Ripple Rejection: The ratio of the peak-to-peak input ripple

voltage to the peak-to-peak output ripple voltage.

Temperature Stability of V

OUT

: The percentage change in out-

put voltage for a thermal variation from room tempera­ture to either temperature extreme.

* C1is required if the regulator is located away from the power source filter.

**C

2

is required for stability.

CS8147

V

ENABLE

V

OUT1

60V

14V

IN

2.0V

0.8V

0V

31V

10V10V

5V

26V

5V

10V

0V

14V

10V 10V

0V

0V

V

OUT2

System

Condition

0V

Turn

On

Control

5V

Load

Dump

C1*

0.1 mF

5V 5V

3V

Low V

IN

Line Noise, Etc. V

V

IN

CS8147

ENABLE

Gnd

OUT

Short

Circuit

V

OUT1

V

OUT2

0V

5V

10V

C2**
10mF

5V

0V

Thermal

Shutdown

DISPLAY

Tuner IC

5V

0V

Turn

Off

6

CS8147

Since both outputs are controlled by the same ,

the CS8147 is ideal for applications where a sleep mode is
required. Using the CS8147, a section of circuitry such as a
display and nonessential 5V circuits can be shut down
under microprocessor control to conserve energy.

The test applications circuit diagram shows an automotive
radio application where the display is powered by 10V
from V

OUT1

and the Tuner IC is powered by 5V from

V

OUT2

. Neither output is required unless both the ignition

and the Radio On/OFF switch are on.

The secondary output V

OUT2

is inherently stable and does
not require a compensation capacitor. However a compen­sation capacitor connected between V

OUT1

and ground is

required for stability in most applications.
The output or compensation capacitor helps determine

three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.

The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum
or aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause instabili­ty. The aluminum electrolytic capacitor is the least expen­sive solution, but, if the circuit operates at low tempera-

tures (-25¡C to -40¡C), both the value and ESR of the capac­itor will vary considerably. The capacitor manufacturers
data sheet usually provides this information.

The value for the output capacitor C2 shown in the test
and applications circuit should work for most applications,
however it is not necessarily the optimized solution.

To determine acceptable value for C2 for a particular
application, start with a tantalum capacitor of the recom­mended value and work towards a less expensive alterna­tive part.

Step 1: Place the completed circuit with a tantalum capaci­tor of the recommended value in an environmental cham­ber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade
box outside the chamber, the small resistance added by the
longer leads is negligible.

Step 2: With the input voltage at its maximum value,
increase the load current slowly from zero to full load
while observing the output for any oscillations. If no oscil­lations are observed, the capacitor is large enough to
ensure a stable design under steady state conditions.

Step 3: Increase the ESR of the capacitor from zero using
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that
cause the greatest oscillation. This represents the worst
case load conditions for the regulator at low temperature.

Step 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage condi­tions.

Step 5: If the capacitor is adequate, repeat steps 3 and 4
with the next smaller valued capacitor. A smaller capacitor
will usually cost less and occupy less board space. If the
output oscillates within the range of expected operating
conditions, repeat steps 3 and 4 with the next larger stan­dard capacitor value.

Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.

Step 7: Raise the temperature to the highest specified oper­ating temperature. Vary the load current as instructed in
step 5 to test for any oscillations.

Once the minimum capacitor value with the maximum
ESR is found for each output, a safety factor should be
added to allow for the tolerance of the capacitor and any
variations in regulator performance. Most good quality
aluminum electrolytic capacitors have a tolerance of ±20%
so the minimum value found should be increased by at
least 50% to allow for this tolerance plus the variation
which will occur at low temperatures. The ESR of the
capacitors should be less than 50% of the maximum allow­able ESR found in step 3 above.

The maximum power dissipation for a dual output regula­tor (Figure 1) is

P

D(max)

= {V

IN(max)

Ð V

OUT1(min)}IOUT1(max)

+

{V

IN(max)

Ð V

OUT2(min)}IOUT2(max)

+ V

IN(max)

IQ (1)

Where:

V

IN(max)

is the maximum input voltage,

V

OUT1(min)

is the minimum output voltage from V

OUT1

,

V

OUT2(min)

is the minimum output voltage from V

OUT2

,

I

OUT1(max)

is the maximum output current, for the appli-

cation,

I

OUT2(max)

is the maximum output current, for the appli-

cation, and

IQis the quiescent current the regulator consumes at
I

OUT(max)

.

Once the value of P

D(max)

is known, the maximum permissi-

ble value of R

QJA

can be calculated:

R

QJA

=

(2)

The value of R

QJA

can then be compared with those in
the package section of the data sheet. Those packages with
R

QJA

's less than the calculated value in equation 2 will keep

the die temperature below 150¡C.

In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.

150¡C - T

A

P

D

ENABLE

Applications

Stability Considerations

Calculating Power Dissipation

in a Dual Output Linear Regulator

7

Application Notes: continued

A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.

Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed
to determine the value of R

QJA

:

R

QJA

= R

QJC

+ R

QCS

+ R

QSA

(3)

where:

R

QJC

= the junctionÐtoÐcase thermal resistance,

R

QCS

= the caseÐtoÐheatsink thermal resistance, and

R

QSA

= the heatsinkÐtoÐambient thermal resistance.

R

QJC

appears in the package section of the data sheet. Like

R

QJA

, it too is a function of package type. R

QCS

and R

QSA

are functions of the package type, heatsink and the inter­face between them. These values appear in heat sink data
sheets of heat sink manufacturers.

Figure 1: Dual output regulator with key performance parameters
labeled.

Heat Sinks

CS8147

I

V

IN

IN

Smart

Regulator

Control
Features

}

I

Q

I

I

OUT

OUT

1

2

V

V

OUT

OUT

1

2

Thermal Data 5 Lead TO-220

R

Q

JC

typ 2.4 ûC/W

R

Q

JA

typ 50 ûC/W

8

Rev. 4/5/99

CS8147

Part Number Description

CS8147YT5 5 Lead TO-220 Straight
CS8147YTVA5 5 Lead TO-220 Vertical
CS8147YTHA5 5 Lead TO-220 Horizontal

Ordering Information

Package Specification

PACKAGE THERMAL DATA

PACKAGE DIMENSIONS IN MM (INCHES)

© 1999 Cherry Semiconductor Corporation

Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.

5 Lead TO-220 (T) Straight

2.87 (.113)

2.62 (.103)

6.93(.273)

6.68(.263)

9.78 (.385)

10.54 (.415)

1.02(.040)

0.63(.025)

1.83(.072)

1.57(.062)

0.56 (.022)

0.36 (.014)

2.92 (.115)

2.29 (.090)

1.40 (.055)

1.14 (.045)

4.83 (.190)

4.06 (.160)

6.55 (.258)

5.94 (.234)

14.22 (.560)

13.72 (.540)

1.02 (.040)

0.76 (.030)

3.71 (.146)

3.96 (.156)

14.99 (.590)

14.22 (.560)

5 Lead TO-220 (THA) Horizontal

0.81(.032)

1.70 (.067)

6.81(.268)

1.40 (.055)

1.14 (.045)

5.84 (.230)

6.60 (.260)

6.83 (.269)

0.56 (.022)

0.36 (.014)

10.54 (.415)

9.78 (.385)

6.55 (.258)

5.94 (.234)

3.96 (.156)

3.71 (.146)

1.68

(.066)

TYP

14.99 (.590)

14.22 (.560)

2.77 (.109)

2.29 (.090)

2.92 (.115)

4.83 (.190)

4.06 (.160)

2.87 (.113)

2.62 (.103)

5 Lead TO-220 (TVA) Vertical

1.68
(.066) typ

1.70 (.067)

7.51 (.296)

1.78 (.070)

4.34 (.171)

0.56 (.022)

0.36 (.014)

1.40 (.055)

1.14 (.045)

4.83 (.190)

4.06 (.160)

14.99 (.590)

14.22 (.560)

2.92 (.115)

2.29 (.090)

.94 (.037)
.69 (.027)

8.64 (.340)

7.87 (.310)

6.80 (.268)

10.54 (.415)

9.78 (.385)

2.87 (.113)

2.62 (.103)

6.55 (.258)

5.94 (.234)

3.96 (.156)

3.71 (.146)