Datasheet CS5206-3GT3, CS5206-3GDPR3, CS5206-3GDP3, CS5206-1GT3, CS5206-1GDPR3 Datasheet (Cherry Semiconductor)

1

Features

■ Output Current to 6A

■ Output Trimmed to +/- 1%

■ Dropout Voltage

1.3V @ 6A

■ Fast Transient Response

■ Fault Protection Circuitry

Thermal Shutdown
Overcurrent Protection
Safe Area Protection

Package Options

3L TO-220

Tab (V

OUT

)

CS5206 -1,-3,-5

6A Adjustable, and Fixed 3.3V

and 5V Linear Regulators

1

CS5206 -1,-3,-5

The CS5206 -X series of linear regu­lators provides 6A at adjustable
and fixed voltages of 3.3V and 5V
with an accuracy of ±1% and ±2%
respectively. The adjustable version
uses two external resistors to set
the output voltage within a 1.25V
to 13V range.

The regulators are intended for use
as post regulators and microproces­sor supplies. The fast loop response
and low dropout voltage make
these regulators ideal for applica­tions where low voltage operation

and good transient response are
important.

The circuit is designed to operate
with dropout voltages as low as 1V
depending on the output current
level. The maximum quiescent cur­rent is only 10mA at full load.

The regulators are fully protected
against overload conditions with
protection circuitry for Safe
Operating Area (SOA), overcurrent
and thermal shutdown.

The regulators are available in TO­220 and surface mount D2packages.

Block Diagram

CS5206 -3, -5

1 Gnd
2V

OUT

3V

IN

CS5206 -1

1 Adj
2V

OUT

3V

IN

CS5206 -1

CS5206 -3, -5

Description

3L D2PAK

1

Rev. 7/8/97

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

A Company

¨

V

IN

Output

Current

Limit

Thermal

Shutdown

Bandgap

+

-

Error

Amplifier

V

Adj

OUT

V

Gnd

OUT

V

IN

Output

Current

Limit

Thermal

Shutdown

Bandgap

+

-

Error

Amplifier

2

Electrical Characteristics: C

IN

= 10µF, C

OUT

= 22µF Tantalum, V

IN

Ð V

OUT

=3V, VIN² 10V, 0¡C ² TA ² 70¡C, TJ² +150¡C,

unless otherwise specified, I

full load

= 6A.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS5206 -1,-3,-5

Absolute Maximum Ratings

Supply Voltage, V

CC

..................................................................................................................................................................17V

Operating Temperature Range................................................................................................................................-40¡C to 70¡C

Junction Temperature ............................................................................................................................................................150¡C

Storage Temperature Range ..................................................................................................................................-60¡C to 150¡C

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

Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak

Electrical Characteristics: C

IN

= 10µF, C

OUT

= 22µF Tantalum, V

IN

Ð V

OUT

=3V, VIN² 15V, 0¡C ² TA ² 70¡C, TJ² +150¡C,

unless otherwise specified, I

full load

= 6A.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

■ Fixed Output Voltage (CS5206 -3, -5)

CS5206 -5 VINÐV

OUT

= 1.5V; 4.9 5.0 5.1 V

(Notes 1 and 2) 0²I

OU T

²6A (-2%) (+2%)

CS5206 -3 VINÐV

OUT

= 1.5V; 3.234 3.300 3.366 V

(Notes 1 and 2) 0²I

OUT

²6A (-2%) (+2%)

Line Regulation 1.5V²VINÐV

OUT

² 6V; I

OUT

=10mA 0.04 0.20 %

Load Regulation VINÐV

OUT

= 1.5V; 0.1 0.4 %

(Notes 1 and 2) 10mA ² I

OUT

²6A

Dropout Voltage (Note 3) I

OUT

=6A 1.3 1.4 V

Current Limit VINÐV

OUT

=3V; TJ³ 25¡C 6.5 8.5 A

VINÐV

OUT

=9V 1.0 A

Quiescent Current VIN²9V; I

OUT

=10mA 5.0 10.0 mA
Thermal Regulation 30ms pulse; TA=25¡C 0.003 %/W
Ripple Rejection f=120Hz; I

OUT

=6A 75 dB

Temperature Stability 0.5 %

■ Adjustable Output Voltage (CS5206 -1)

Reference Voltage VINÐV

OUT

= 1.5V; V

Adj

= 0V 1.241 1.254 1.266 V

(Notes 1 and 2) 10mA²I

OUT

²6A (-1%) (+1%)

Line Regulation 1.5V²VINÐV

OUT

²6V; I

OUT

=10mA 0.04 0.20 %

Load Regulation VINÐV

OUT

=1.5V; 0.1 0.4 %

(Notes 1 and 2) 10mA²I

OUT

²6A

Dropout Voltage (Note 3) I

OUT

=6A 1.3 1.4 V

Current Limit VINÐV

OUT

=3V; TJ³ 25¡C 6.5 8.5 A

VINÐV

OUT

=9V 1.0 A

Minimum Load Current VINÐV

OUT

=7V 1.2 6 mA
Adjust Pin Current 50 100 µA
Adjust Pin Current Change 1.5V²VINÐV

OUT

²4V; 0.2 5.0 µA

10mA²I

OUT

²6A
Thermal Regulation 30ms pulse; TA=25¡C 0.003 %W
Ripple Rejection f=120Hz; C

Adj

=25µF; I

OUT

=6A 82 dB
Temperature Stability 0.5 %
RMS Output Noise 10Hz²f²10kHz; TA=25¡C 0.003 %V

OUT

Thermal Shutdown 150 180 ¡C
Thermal Shutdown Hysteresis 25 ¡C

CS5206 -1,-3,-5

3

Typical Performance Characteristics

Dropout Voltage vs. Output Current Reference Voltage vs. Temperature

Load Regulation vs. Output Current

Package Pin Description

PACKAGE PIN # PIN SYMBOL FUNCTION

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

■ Fixed Output Voltage (CS5206 -3, -5)

RMS Output Noise (%V

OUT

) 10Hz²f²10kHz 0.003 %V

OUT

Thermal Shutdown 150 180 ¡C
Thermal Shutdown Hysteresis 25 ¡C

Note 1: Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in out-

put voltage due to thermal gradients or temperature changes must be taken into account separately.
Note 2: Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4Ó from the bottom of the package.
Note 3: Dropout voltage is a measurement of the minimum input/output differential at full load.

Electrical Characteristics: C

IN

= 10µF, C

OUT

= 22µF Tantalum, V

IN

Ð V

OUT

=3V, VIN² 10V, 0¡C ² TA ² 70¡C, TJ² +150¡C,

unless otherwise specified, I

full load

= 6A.

CS5206 -1 CS5206 -3, -5

D2PAK 3L TO-220 D2PAK 3L TO-220

1 1 N/A N/A Adj Adjust pin (low side of the internal reference).

222 2 V

OUT

Regulated output voltage (case).

333 3 VINInput voltage.

N/A N/A 1 1 Gnd Ground connection.

Minimum Load Current

1.40

1.35

1.30

1.25

1.20

1.15

1.10

1.05

1.00

0.95

Dropout Voltage (V)

0.90

0.85
T

= 25°C

CASE

0.80

0.75

0.70

01 2 3 4 5 6

0.200

0.175

0.150

0.125

0.100

0.075

0.050

Output Voltage Deviation (%)

0.025

0.000

01 2 3 4 5 6

T

= 0°C

CASE

Output Current (A)

Output Current (A)

T

= 125°C

CASE

T

= 125°C

CASE

T

= 25°C

CASE

T

= 0°C

CASE

0.10

0.08

0.06

0.04

0.02

0.00

-0.02

-0.04

-0.06

Output Voltage Deviation (%)

-0.08

-0.10

-0.12
0 10 130

20 30 40 50 60 70 80 90 100 110 120

2.500

2.175

1.850

1.525

1.200

Minimum Load Current (mA)

0.875
T

= 25°C

CASE

0.550

123456

VIN – V

TJ (°C)

OUT

(V)

T

CASE

7

T

= 0°C

CASE

= 125°C

8

9

4

The CS5206 -X family of linear regulators provide fixed or
adjustable voltages at currents up to 6A. The regulators
are protected against short circuit, and include thermal
shutdown and safe area protection (SOA) circuitry. The
SOA protection circuitry decreases the maximum avail­able output current as the input-output differential volt­age increases.

The CS5206 -X has a composite PNP-NPN output transistor
and requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.

The adjustable regulator (CS5206 -1) has an output voltage
range of 1.25V to 13V. An external resistor divider sets the
output voltage as shown in Figure 1. The regulator main­tains a fixed 1.25V (typical) reference between the output
pin and the adjust pin.

A resistor divider network R1 and R2 causes a fixed cur­rent to flow to ground. This current creates a voltage
across R2 that adds to the 1.25V across R1 and sets the
overall output voltage. The adjust pin current (typically
50µA) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of V

OUT

is necessary.

The output voltage is set according to the formula:

V

OUT

= V

REF

´

()

+ I

Adj

´ R2

The term I

Adj

´ R2 represents the error added by the adjust

pin current.
R1 is chosen so that the minimum load current is at least

10mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. The adjust pin is
bypassed to improve the transient response and ripple
rejection of the regulator.

Figure 1. Resistor divider scheme for the adjustable version.

R1 + R2

R1

Adjustable Operation

Applications Information

CS5206 -1,-3,-5

Typical Performance Characteristics: continued

70.0

Adjust Pin Current vs. Temperature Ripple Rejection vs. Frequency (Fixed Versions)

Ripple Rejection vs. Frequency (Adjustable Version)

65.0

60.0

55.0

50.0

Adjust Pin Current (mA)

45.0

40.0

IO = 10mA

02030405060

10 70

Temperature (°C)

100.0

90.0

80.0

70.0

60.0

50.0

40.0

Ripple Rejection (dB)

30.0

20.0

10.0

90

100

120

80

110

130

0.0

T

= 25°C

CASE

= 6A

I

OUT

Ð V

IN

RIPPLE

OUT

= 1.6V

2

10

) = 3V

PP

Frequency (Hz)

3

10

4

10

5

10

(V
V

1

10

100.0

90.0

80.0

70.0

60.0

50.0

40.0

Ripple Rejection (dB)

30.0

20.0

10.0

0.0

T
I
(V
V
C

1

10

CASE

OUT

IN

RIPPLE

Adj

= 25°C
= 6A
Ð V

OUT

= 1.6V

= 25mF

10

) = 3V

PP

2

Frequency (Hz)

3

10

4

10

5

10

V

IN

C

1

V

IN

CS5206-1

V

OUT

V

REF

Adj

I

Adj

C

Adj

R

1

R

2

V

OUT

C

2

5

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 is 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. However, when the circuit operates at low tempera­tures, both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturers data sheet pro­vides this information.

A 22µF tantalum capacitor will work for most applications,
but with high current regulators such as the CS5206 -X the
transient response and stability improve with higher val­ues of capacitor. The majority of applications for this regu­lator involve large changes in load current so the output
capacitor must supply the instantaneous load current. The
ESR of the output capacitor causes an immediate drop in
output voltage given by:

ÆV = ÆI ´ ESR

For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum
and ceramic capacitors in parallel. This reduces the overall
ESR and reduces the instantaneous output voltage drop
under load transient conditions. The output capacitor net­work should be as close as possible to the load for the best
results.

When large external capacitors are used with a linear regu­lator it is sometimes necessary to add protection diodes. If
the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator.
The discharge current depends on the value of the capaci­tor, the output voltage and the rate at which V

IN

drops. In
the CS5206-X family of linear regulators, the discharge
path is through a large junction and protection diodes are
not usually needed. If the regulator is used with large
values of output capacitance and the input voltage is
instantaneously shorted to ground, damage can occur. In
this case, a diode connected as shown in Figures 2a and 2b
is recommended.

Figure 2a. Protection diode scheme for adjustable output regulator.

Figure 2b. Protection diode scheme for fixed output regulators.

Since the CS5206 -X is a three terminal regulator, it is not
possible to provide true remote load sensing. Load regula­tion is limited by the resistance of the conductors connect­ing the regulator to the load. For best results the fixed reg­ulators should be connected as shown in Figure 3.

Figure 3. Conductor parasitic resistance can be minimized with the
above grounding scheme for fixed output regulators.

For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of
the regulator as shown in Figure 4. If R1 is connected to the
load, RCis multiplied by the divider ratio and the effective
resistance between the regulator and the load becomes

RC´

()

RC= conductor parasitic resistance

Figure 4. Grounding scheme for the adjustable output regulator to min­imize parasitics.

R1 + R2

R1

Output Voltage Sensing

Protection Diodes

Stability Considerations

Applications Information: continued

CS5206-1,-3,-5

IN4002 (optional)

V

IN

C

1

V

IN

CS5206-X

Gnd

V

OUT

V

OUT

C

2

V

IN

V

IN

CS5206-X

Gnd

V

OUT

conductor parasitic
resistance

R

C

R

LOAD

IN4002 (optional)

V

IN

C

1

V

IN

CS5206-1

Adj

V

OUT

R

1

R

C

Adj

2

V

OUT

C

2

V

IN

V

IN

CS5206-1

Adj

V

OUT

R

C

R

1

R

2

conductor parasitic
resistance

R

LOAD

6

Applications Information: continued

CS5206 -1,-3,-5

The CS5206 -X series of linear regulators includes thermal
shutdown and safe operating area circuitry to protect the
device. High power regulators such as these usually oper­ate at high junction temperatures so it is important to cal­culate the power dissipation and junction temperatures
accurately to ensure that an adequate heat sink is used.

The case is connected to V

OUT

on the CS5206 -X, electrical
isolation may be required for some applications. Thermal
compound should always be used with high current regu­lators such as these.

The thermal characteristics of an IC depend on the follow­ing four factors:

1. Maximum Ambient Temperature T

A

(¡C)

2. Power dissipation P

D

(Watts)

3. Maximum junction temperature T

J

(¡C)

4. Thermal resistance junction to ambient R

QJA

(C/W)

These four are related by the equation

TJ= TA+ PD´ R

QJA

(1)

The maximum ambient temperature and the power dissi­pation are determined by the design while the maximum
junction temperature and the thermal resistance depend
on the manufacturer and the package type.

The maximum power dissipation for a regulator is:

P

D(max)

={V

IN(max)ÐVOUT(min)}IOUT(max)+VIN(max)IQ

(2)

where
V

IN(max)

is the maximum input voltage,

V

OUT(min)

is the minimum output voltage,

I

OUT(max)

is the maximum output current, for the application

I

Q

is the maximum quiescent current at I

OUT

(max).

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 has a thermal resistance. Like series
electrical resistances, these resistances are summed to
determine R

QJA

, the total thermal resistance between the

junction and the surrounding air.

1. Thermal Resistance of the junction to case, R

QJC

(¡C/W)

2. Thermal Resistance of the case to Heat Sink, R

QCS

(¡C/W)

3. Thermal Resistance of the Heat Sink to the ambient air,
R

QSA

(¡C/W)

These are connected by the equation:

R

QJA

= R

QJC

+ R

QCS

+ R

QSA

(3)

The value for R

QJA

is calculated using equation (3) and the

result can be substituted in equation (1).
The value for R

QJC

is normally quoted as a single figure for
a given package type based on an average die size. For a
high current regulator such as the CS5206 -X the majority
of the heat is generated in the power transistor section.
The value for R

QSA

depends on the heat sink type, while

R

QCS

depends on factors such as package type, heat sink
interface (is an insulator and thermal grease used?), and
the contact area between the heat sink and the package.
Once these calculations are complete, the maximum per­missible value of R

QJA

can be calculated and the proper
heat sink selected. For further discussion on heat sink
selection, see application note ÒThermal Management for
Linear Regulators.Ó

Calculating Power Dissipation and Heat Sink Requirements

7

Part Number Type Description

CS5206 -1GT3 6A, adj. output 3 L TO-220 Straight
CS5206 -1GDP3 6A, adj. output 3 L D2PAK
CS5206 -1GDPR3 6A, adj. output 3 L D

2

PAK

(tape & reel)

CS5206 -3GT3 6A, 3.3V output 3 L TO-220 Straight
CS5206 -3GDP3 6A, 3.3V output 3 L D2PAK
CS5206 -3GDPR3 6A, 3.3V output 3 L D

2

PAK

(tape & reel)

CS5206 -5GT3 6A, 5V output 3 L TO-220 Straight

Ordering Information

Rev. 7/8/97

Package Specification

PACKAGE DIMENSIONS IN mm(INCHES)

Thermal Data 3L 3L

TO-220 D2PAK

R

QJC

typ 1.6 1.6 ûC/W

R

QJA

typ 50 10 - 50* ûC/W

*Depending on thermal properties of substrate. R

QJA

= R

QJC

+ R

QCA

PACKAGE THERMAL DATA

CS5206 -1,-3,-5

© 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.

3 Lead D2PAK (DP)

2.54 (.100) REF

10.31 (.406)

10.05 (.396)

8.53 (.336)

8.28 (.326)

0.91 (.036)

0.66 (.026)

1.40 (.055)

1.14 (.045)

4.57 (.180)

4.31 (.170)

1.68 (.066)

1.40 (.055)

2.74(.108)

2.49(.098)

1.40 (.055)

1.14 (.045)

0.10 (.004)

0.00 (.000)

.254 (.010) REF

15.75 (.620)

14.73 (.580)

2.79 (.110)

2.29 (.090)

3 Lead TO-220 (T) Straight

5.33 (.210)

4.83 (.190)

2.79 (.110)

2.29 (.090)

1.02 (.040)

0.63 (.025)

0.56 (.022)

0.38 (.014)

1.40 (.055)

1.14 (.045)

4.83 (.190)

4.06 (.160)

6.17 (.243) REF

1.14 (.045)

1.52 (.060)

1.14 (.045)

1.40 (.055)

2.87 (.113)

2.62 (.103)

6.55 (.258)

5.94 (.234)

14.22 (.560)

13.72 (.540)

2.92 (.115)

2.29 (.090)

9.78 (.385)

10.54 (.415)

3.71 (.146)

3.96 (.156)

14.99 (.590)

14.22 (.560)