Datasheet CS8361YT7, CS8361YN16, CS8361YDWR20, CS8361YDWFR16, CS8361YDWF16 Datasheet (Cherry Semiconductor)

1

Features

■ 2 Regulated Outputs

Standby Output 5V

±2%; 100mA

Tracking Output 5V;

250mA

■ Low Dropout Voltage

(0.4V at rated current)

■ RESET Option

■ ENABLE Option

■ Low Quiescent Current

■ Protection Features

Independent Thermal

Shutdown
Short Circuit
60V Load Dump
Reverse Battery

Package Options

7L TO-220

CS8361

5V Dual Micropower Low Dropout

Regulator with ENABLE and RESET

CS8361

Block Diagram

Description

7L D2PAK

1

16 Lead PDIP & SOIC Wide

(internally fused leads)

NC

NC

NC

NC

NC

NC

V

IN

Gnd
Gnd

Gnd
Gnd

V

TRK

Adj

ENABLE

RESET

V

STBY

1. V

STBY

2. V

IN

3. V

TRK

4. Gnd

5. Adj

6. ENABLE

7. RESET

Also available in 20 Lead SOIC Wide.
Consult factory for 20 Lead PSOP .

* Consult factory for positive ENABLE option.

Rev. 5/4/99

The CS8361 is a precision micro­power dual voltage regulator with

and .

The 5V standby output is accurate
within ±2% while supplying loads
of 100mA and has a typical
dropout voltage of 400mV.
Quiescent current is low, typically
140µA with a 300µA load. The
active output monitors the
5V standby output and holds
the line low during power­up and regulator dropout condi­tions. The circuit includes
hysteresis and is guaranteed to
operate correctly with 1V on the
standby output.

The second output tracks the 5V
standby output through an external
adjust lead, and can supply loads
of 250mA with a typical dropout
voltage of 400mV. The logic level

lead is used to control

this tracking regulator output.

Both outputs are protected against
overvoltage, short circuit, reverse
battery and overtemperature condi­tions. The robustness and low qui­escent current of the CS8361 makes
it not only well suited for automo­tive microprocessor applications,
but for any battery powered micro­processor applications.

ENABLE

RESET

RESET

RESET

RESETENABLE

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

Overvoltage

Shutdown

OVSD

Current

Limit

Bandgap

BG

BG

+

–

RESET

V

STBY

5V,100mA,2%

1

V

IN

Thermal

Shutdown

ENABLE

Gnd

–

+

TSD

TSD

RESET

BG

OVSD

V

TRK

Current

Limit

–

+

V

STANDBY

OVSD

TSD

+

–

250mA

Adj

RESET

1

2

Electrical Characteristics: 6V ² V

IN

² 26V, I

OUT1

= I

OUT2

= 100µA, -40¡C ² TA ²+125¡C, -40¡C ²TJ² +150¡C,

unless otherwise specified.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS8361

Absolute Maximum Ratings

Supply Voltage, V

IN

.....................................................................................................................................................-16V to 26V

Positive Transient Input Voltage, tr > 1ms.............................................................................................................................60V

Negative Transient Input Voltage, T < 100ms, 1% Duty Cycle..........................................................................................-50V

Input Voltage Range ( , ) ...............................................................................................................-0.3V to 10V

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

Storage Temperature Range................................................................................................................................-55¡C to +150¡C

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

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

RESETENABLE

■ Tracking Output (V

TRK

)

V

STBY

Ð V

TRK

, 6V ² VIN² 26V -25 +25 mV

V

TRK

Tracking Error 100µA ² I

TRK

² 250mA (note 1)

Adjust Pin Current, I

Adj

Loop in Regulation 1.5 5 µA

Line Regulation 6V ² VIN² 26V (note 1) 5 50 mV

Load Regulation 100µA ² I

TRK

² 250mA (note 1) 5 50 mV

Dropout Voltage (VINÐ V

TRK

) I

TRK

= 100µA 100 150 mV

I

TRK

= 250mA 400 700 mV

Current Limit VIN= 12V, V

TRK

= 4.5 275 500 mA

Quiescent Current VIN= 12V, I

TRK

= 250mA 25 50 mA

No Load on V

STBY

Reverse Current V

TRK

= 5V, VIN= 0V 200 1500 µA

Ripple Rejection f = 120Hz, I

TRK

= 250mA 60 70 dB

7V ² VIN² 17V

■ Standby Output (V

STBY

)

Output Voltage, V

STBY

6V ² VIN² 26V 4.90 5.00 5.10 V
100µA ² I

STBY

² 100mA

Line Regulation 6V ² VIN² 26V 5 50 mV

Load Regulation 100µA ² I

STBY

² 100mA 5 50 mV

Dropout Voltage (VINÐ V

STBY

) I

STBY

= 100µA 100 150 mV

I

STBY

= 100mA 400 600 mV

Current Limit VIN= 12V, V

STBY

= 4.5V 125 200 mA

Short Circuit Current VIN= 12V, V

STBY

= 0V 10 100 mA

Quiescent Current V

IN

= 12V, I

STBY

= 100mA 10 20 mA

I

TRK

= 0mA

V

IN

= 12V, I

STBY

= 300µA 140 200 µA

I

TRK

= 0mA

Reverse Current V

STBY

= 5V, VIN= 0V 100 200 µA

Ripple Rejection f = 120Hz, I

STBY

= 100mA 60 70 dB

7V ² VIN² 17V

Note 1: V

TRK

connected to Adj lead. V

TRK

can be set to higher values by using an external resistor divider.

CS8361

3

Package Lead Description

PACKAGE LEAD # LEAD SYMBOL FUNCTION

Electrical Characteristics: 6V ² V

IN

² 26V, I

OUT1

= I

OUT2

= 100µA, -40¡C ² TA ²+125¡C, -40¡C ²TJ² +150¡C,

unless otherwise specified.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

■ Functions

Input Threshold 0.8 1.2 2.0 V

Input Bias Current V

ENABLE

= 0V to 10V -10 0 10 µA

Threshold High (VRH)V

STBY

Increasing 4.59 4.87 V

STBY

-0.02 V

Hysteresis 60 120 180 mV

Threshold Low (VRL)V

STBY

Decreasing 4.53 4.75 V

STBY

-0.08 V

Leakage 25 µA

Output Voltage

Low (V

RLO

); R

RST

= 10k½ 1V ² VS

TBY²VRL

0.1 0.4 V

Low (V

RPEAK

)V

STBY

, Power Up, Power Down 0.6 1.0 V

■ Protection Circuitry (Both Outputs)

Independent Thermal Shutdown V

STBY

150 180 ¡C

V

TRK

150 165 ¡C

Overvoltage Shutdown 30 34 38 V

RESET

RESET

RESET

RESET

ENABLE

ENABLE

ENABLERESET

16L PDIP & SO 20L SO Wide

7L 7L Wide (Internally (Internally

TO-220 D2PAK Fused Leads) Fused Leads)

1 1 16 20 V

STBY

Standby output voltage delivering 100mA.

22 1 1 V

IN

Input voltage.

33 3 2 V

TRK

Tracking output voltage controlled by

delivering 250mA.

4 4 4,5,12,13 4,5,6,7 Gnd Reference ground connection.

14,15,16,17

5 5 6 8 Adj Resistor divider from V

TRK

to Adj. Sets the

output voltage on V

TRK

. If tied to V

TRK

, V

TRK

will track V

STBY

.

66 8

10

Provides on/off control of the tracking output,
active LOW.

7 7 9 11 CMOS compatible output lead that goes low

whenever V

STBY

falls out of regulation.

2,7,10, 3,9,12,13, NC No Connection.

11,14,15 18,19

RESET

ENABLE

ENABLE

4

CS8361

Circuit Description

Application Notes

The function switches the output transistor for
V

TRK

on and off. When the lead voltage exceeds

1.4V(typ), V

TRK

turns off. This input has several hundred
millivolts of hysteresis to prevent spurious output activity
during power-up or power-down.

The is an open collector NPN transistor, con­trolled by a low voltage detection circuit sensing the V

STBY

(5V) output voltage. This circuit guarantees the
output stays below 1V (0.1V typ) when V

STBY

is as low as
1V to ensure reliable operation of microprocessor-based
systems.

This output uses the same type of output device as V

STBY

,
but is rated for 250mA. The output is configured as a
tracking regulator of the standby output. By using the
standby output as a voltage reference, giving the user an
external programming lead (Adj lead), output voltages
from 5V to 20V are easily realized. The programming is
done with a simple resistor divider (Figure 2), and follow­ing the formula:

V

TRK

= V

STBY

´ (1 + R1/R2) + I

Adj

´ R1

If another 5V output is needed, simply connect the Adj
lead to the V

TRK

output lead.

V

TRK

Output Voltage

RESET

RESET

RESET Function

ENABLE

ENABLE

ENABLE Function

Output capacitors for the CS8361 are required for stability.
Without them, the regulator outputs will oscillate. Actual
size and type may vary depending upon the application
load and temperature range. Capacitor effective series
resistance (ESR) is also a factor in the IC stability. Worst­case is determined at the minimum ambient temperature
and maximum load expected.

Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief
conditions of negative input transients that might be char­acteristic of a particular system.

Capacitors must also be rated at all ambient temperatures
expected in the system. To maintain regulator stability
down to -40ûC, capacitors rated at that temperature must
be used.

More information on capacitor selection for Smart
Regulatorsª is available in the Smart Regulator applica­tion note, ÒCompensation for Linear Regulators.Ó

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

PD(max) = {VIN(max)ÐV

OUT1

(min)}I

OUT1

(max)+

{V

IN

(max)ÐV

OUT2

(min)}I

OUT2

(max)+VIN(max)IQ (1)

Where

VIN(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

application

I

OUT2

(max) is the maximum output current, for the

application

IQis the quiescent current the regulator consumes at
I

OUT

(max).

Once the value of PD(max) is known, the maximum per­missible 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
heat sink will be required.

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

150¡C - T

A

P

D

Calculating Power Dissipation

in a Dual Output Linear Regulator

External Capacitors

I

V

IN

IN

Smart

Regulator

Control
Features

}

I

Q

I

OUT1

I

OUT2

V

V

OUT1

OUT2

5

CS8361

Test & Application Circuits

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 caseÐtoÐheat sink thermal resistance, and

R

QSA

= the heat sinkÐtoÐambient 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, heat sink and the inter­face between them. These values appear in heat sink data
sheets of heat sink manufacturers.

Heat Sinks

Application Notes: continued

Figure 2: 5V, 8V Regulator

Figure 3: Dual 5V Regulator

B+

0.1µF

C1*

V

IN

V

STBY

CS8361

RESET

ENABLE

Adj

Gnd

V

TRK

R3

R1

C3**

R2

10µF
ESR<8Ω

5V, 100mA

C2**

SW 8V,
250mA

10µF
ESR<8Ω

V

DD

RESET

I/O

Gnd

MCU

* C1 is required if regulator is located far from power supply filter.
** C2 and C3 are required for stability.

B+

0.1µF

C1*

For V

V

IN

Gnd

V

TRK

CS8361

~ V

TRK

(1 + R1/R2)

STBY

~ 8V, R1/R2 ~ 0.6

V

STBY

RESET

ENABLE

Adj

V

TRK

R1

C3**

5V, 100mA

C2**

10µF
ESR<8Ω

10µF
ESR<8Ω

SW 5V,
250mA

V

DD

RESET

I/O

Gnd

MCU

* C1 is required if regulator is located far from power supply filter.
** C2 and C3 are required for stability.

D

Lead Count Metric English

Max Min Max Min
16L PDIP 19.69 18.67 .775 .735
16L SO Wide* 10.50 10.10 .413 .398
20L SO Wide* 13.00 12.60 .512 .496

Part Number Description

CS8361YDPS7 7L D2PAK short-leaded
CS8361YDPSR7 7L D2PAK short-leaded, (tape & reel)
CS8361YT7 7L TO-220 (Straight)
CS8361YDWF16 16L SO Wide*
CS8361YDWFR16 16L SO Wide*, (tape & reel)
CS8361YN16 16L PDIP
CS8361YDW20 20L SO Wide*
CS8361YDWR20 20L SO Wide*, (tape & reel)

6

Ordering Information

Rev. 5/4/99 © 1999 Cherry Semiconductor Corporation

CS8361

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

Package Specification

PACKAGE DIMENSIONS IN mm(INCHES)

PACKAGE THERMAL DATA

Thermal Data typ R

QJA

R

QJC

ûC/W

7L D2PAK 10-50

**

3.5
7L TO-220 50 3.5
16L PDIP 80 42
16L SO Wide* 75 18
20L SO Wide* 55 9

** Depending on thermal properties of substrate. R

Q

JA

= R

Q

JC

+ R

Q

CA

Plastic DIP (N); 300 mil wide

0.39 (.015)
MIN.

2.54 (.100) BSC

1.77 (.070)

1.14 (.045)

D

Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.

.203 (.008)

.356 (.014)

REF: JEDEC MS-001

3.68 (.145)

2.92 (.115)

8.26 (.325)

7.62 (.300)

7.11 (.280)

6.10 (.240)

.356 (.014)

.558 (.022)

Surface Mount Wide Body (DW); 300 mil wide

1.27 (.050) BSC

7.60 (.299)

7.40 (.291)

10.65 (.419)

10.00 (.394)

D

0.32 (.013)

0.23 (.009)

1.27 (.050)

0.40 (.016)

REF: JEDEC MS-013

2.49 (.098)

2.24 (.088)

0.51 (.020)

0.33 (.013)

2.65 (.104)

2.35 (.093)

0.30 (.012)

0.10 (.004)

* Internally Fused Leads

7 Lead D2PAK (DPS)* Short-Leaded

1.98 (.078)

1.47 (.058)

14.71 (.579)

13.69 (.539)

4.57 (.180)

4.31 (.170)

1.40 (.055)

1.14 (.045)

2.79 (.110)

2.54 (.100)

TERMINAL 8

7.75 (.305)
REF

6.50 (.256) REF

10.31 (.406)

10.05 (.396)

1.27 (.050)
REF

1.68 (.066)

1.40 (.055)

.254 (.010)

REF

0.91 (.036)

0.66 (.026)

8.53 (.336)

8.28 (.326)

0.10 (.004)

0.00 (.000)

*CHERRY SEMICONDUCTOR SHORT-LEADED FOOTPRINT

7 Lead TO-220 (T) Straight

2.87 (.113)

2.62 (.103)

9.78 (.385)

10.54 (.415)

1.40 (.055)

1.14 (.045)

0.64 (.025)

0.38 (.015)

0.56 (.022)

0.36 (.014)

1.40 (.055)

1.14 (.045)

4.83 (.190)

4.06 (.160)

14.22 (.560)

13.72 (.540)

0.94 (.037)

0.58 (.023)

7.75 (.305)

7.49 (.295)

2.92 (.115)

2.29 (.090)

3.71 (.146)

3.96 (.156)

14.99 (.590)

14.22 (.560)

6.55 (.258)

5.94 (.234)