Datasheet TK11821MTL, TK11821MMG, TK11821MBX Datasheet (TOKO)

TK11821

B

D

G

S

DC-DC CONVERTER

FEATURES

■ Very Low Noise

■ Very Small Size

■ Few External Components

■ Wide Supply Voltage Range (0.9 to 10 V)

■ Sinewave Oscillator

■ Selectable Output Voltages

DESCRIPTION

The TK11821 is a low power, low input voltage DC-DC converter. The device has been optimized for variable capacitance diode and PIN photodiode bias applications. It generates 10 Vdc and 24 Vdc output voltages from an input voltage as low as 0.9 V.

Since the built-in high frequency oscillator generates sinewaves, the TK11821 produces very low RF interference noise. The internal oscillator is capable of operation at frequencies as high as 6-8 MHz, therefore, interference filtering is simple and effective. This unique feature makes the TK11821 ideally suitable for RF and fiber optic receiver applications.

APPLICATIONS

■ Variable Capacitance and PIN Photodiode Bias

■ Portable Instrumentation

■ Radio Control Systems

■ Mobile Radios

■ Cellular Telephones

■ Cordless Telephones

■ Fiberoptic Receivers

■ Local Area Network (LAN) Receivers

■ Battery Operated Equipment

TK11821M

1

OSC

2

YPASS

V

D

3 4

O

821

A21

8

V

FB

7

GN V

6

IN

T1

5

The device is capable of operation in the 0.9 to 10 V power supply voltage range.

The output voltage is 24 V when T1 is not connected. When T1 is connected to VO, the output voltage is set to 10 V.

The TK11821 is available in an 8-pin plastic surface mount (MFP-8) package. External inductive components are also available.

ORDERING INFORMATION

V

6

IN

BLOCK DIAGRAM

V

FB

5

Feedback

Control

OSC

V

D

1

2

V

4

O

TK11821M

Tape/Reel Code

5

ND

7

V REF

TAPE/REEL CODE

BX: Bulk/Bag TL: Tape Left MG: Magazine

January, 1996 TOKO, Inc.

1-30-96

T1

3

BYPAS

Page 1

TK11821

ABSOLUTE MAXIMUM RATINGS

Input Voltage............................................................ 10 V

Output Voltage ......................................................... 26 V

Output Current ..................................................... 0.5 mA

Operating Voltage Range............................... 0.9 to 10 V

Power Dissipation (Note 1) ................................ 350 mW

ELECTRICAL CHARACTERISTICS

Test conditions: VIN = 0.9 V → 2.0 V Operating Conditions: V

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

I

V

CC

O

Input Current

Output Voltage

= 1.1 V, TA = 25 °C unless otherwise specified.

IN

IO = 0 , VO = 10 V 3.5 7.0 mA IO = 50 µA, VO = 10 V 5.5 9.0 mA

IO = 0 µA, 1.6 V ≤ VIN ≤ 2.0 V 22.5 24.0 25.5 V VO - T1 shorted, IO = 50 µA 9.6 10.0 10.4 V

Junction Temperature .......................................... 150 °C

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

Operating Temperature Range .................-20 to +70 °C

Lead Soldering Temp. (10 sec.)........................... 260 °C

I

O

Output Current VO - T1 shorted 90 100 µA Load Reg Load Regulation Note 2 0.1 0.35 % ∆VO/T

V

OSC-S

f

OSC

A

Output Voltage

Temperature Dependency

Oscillation Starting Voltage IO = 0 µA 0.75 V

Oscillation Frequency IO = 0 µA, Note 2 4.0 MHz

VO = 24 V, IO = 50 µA +2.3 mV/°C VO = 10 V, IO = 50 µA -1.5 mV/°C

ELECTRICAL CHARACTERISTICS

Test conditions: VIN = 1.8 V → 10.0 V Operating Conditions: V

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

I

V

I

CC

O

Input Current

Output Voltage

Output Current VO - T1 shorted 90 100 µA Load Reg Load Regulation Note 2 0.1 0.35 % ∆VO/T

A

Output Voltage

Temperature Dependency

= 3.0 V, TA = 25 °C unless otherwise specified.

IN

IO = 0 , VO = 10 V 3.5 7.0 mA IO = 50 µA, VO = 10 V 5.5 9.0 mA

IO = 0 µA, 1.6 V ≤ VIN ≤ 2.0 V 22.5 24.0 25.5 V VO - T1 shorted, IO = 50 µA 9.6 10.0 10.4 V

VO = 24 V, IO = 50 µA +2.3 mV/°C VO = 10 V, IO = 50 µA -1.5 mV/°C

V

OSC-S

f

OSC

Note 1: Power dissipation must be derated at the rate of 3 mW/°C for operation at TA = 25 °C and above. Note 2: Use the same value for L that was used in the measurement circuit. Note 3: Output Voltage Variation = (∆V Note 4: The circuit constants will be changed by the input voltage at the 0.9 V to 2.0 V range and 1.8 V to 10 V range.

Page 2

Oscillation Starting Voltage IO = 0 µA 1.5 V

Oscillation Frequency IO = 0 µA, Note 2 3.5 MHz

O1/VO1

) X 100 (%), ∆V

= VO1 (no load) - V

O1

1-30-96

O1 (IO

= 50 µA).

January, 1996 TOKO, Inc.

TK11821

0

3

0

4

0

5

0

1

0

2

0 0.2 0.4 0.6 0.8 1.0

I (mA)

O

0

5

10

V (V)

O

TPC06

OUTPUT VOLTAGE vs. OUTPUT CURRENT

24 V OUTPUT

T = 25°C

A

V = 2 V

IN

3 V 4 V 5 V

2

TEST CIRCUIT

V

IN

The value of the circuit constants against the input voltage.

+

2 µF

L

1

3

C

A

C

OUTPUT VOLTAGE vs. INPUT VOLTAGE

10 V OUTPUT

0 µA 40 µA 80 µA

120 µA

O

V (V)

10

5

T

6

4

B

821

C2 0.1 µF

0.1 µF

GND

+

1 µF

V

O

The output voltage is 24 V. When connected between the V and the T terminal, the output voltage will be 10 V.

INPUT TOKO COIL VOLTAGE C

A CB

0.9 V to 2 V 33 pF 10 pF PS5CDLN-1250

1.8 V to 10 V 820 pF 33 pF PS5CDLN-1303

O

TYPICAL PERFORMANCE CHARACTERISTICS

T = 25 °C

A

OUTPUT VOLTAGE vs. OUTPUT CURRENT

10 V OUTPUT

10

IN

V

= 2 V

O

V (V)

5

V

IN

V = 4 V

= 3 V

IN

INPUT CURRENT vs. INPUT VOLTAGE

10

(mA)

5

IN

I

PART NUMBER

10 V OUTPUT

T = 25°C

A

IO = 120 µA

IO = 80 µA

IO = 40 µA

TA = 25 °C

V

= 1 V

0

0 0.4 0.8 1.2 1.6 2.

V (V)

IN

TPC0

0

OUTPUT VOLTAGE vs. INPUT VOLTAGE

24 V OUTPUT

T = 25 °C

A

24

IO = 0 µA

V (V)

O

10

0

0 0.8 1.6 2.4 3.2 4.

IO = 40 µA

IO = 80 µA

IO = 120 µA

V (V)

IN

TPC0

20

(mA)

10

IN

I

0

0 0.8 1.6 2.4 3.2 4.

January, 1996 TOKO, Inc.

IN

0 0.2 0.4 0.6 0.8 1.

I (mA)

O

TPC0

INPUT CURRENT vs. INPUT VOLTAGE

24 V OUTPUT

T = 25°C

A

1-30-96

V (V)

IN

IO = 80 µA

IO = 40 µA

IO = 0 µA

TPC0

IO = 120 µA

0

0 0.4 0.8 1.2 1.6 2.

V

IO = 0 µA

(V)

IN

TPC0

Page 3

TK11821

OUTPUT VOLTAGE vs.

T

VIN

G

1

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

10.3

10.2 V = 10 V

O

10.1

O

V (V)

10.0 V = 24 V

O

9.9

0

-30 -20 0 20 40 60

TEMPERATURE

TEMP (°C)

TK11821 • TPC07

24.6

24.5

24.4

24.3

24.2

O

V (V)

TYPICAL AM/FM VARACTOR DIODE BIAS CIRCUIT

+

1

ND

C A

C B

6

43

1

821

0.1

+

h

C 2

TR

AM HIGH FM LOW

TK 11821 BD FIG 0

Page 4

1-30-96

January, 1996 TOKO, Inc.

PACKAGE OUTLINES

MFP-8

0.76

TK11821

8

1 4

+0.1

-0.01

0.4

0.12

M

5

1.27

0.2 ±

4.4

e

1.27

Recommended Mount Pad

±

0.2

5.0

0.2 ±

1.4

0.1min

1.7max

6.0

e

1.27

0.1

5.5

1

e

±

0.2

0.5

0°~10°

-0.05

+0.1

0.15

0.3

±

Unit:mm

Marking Information

821

The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.

TOKO America, Inc. 1250 Feehanville Dr. Mt. Prospect, IL 60056 Tel: (800) PIK-TOKO Fax: (847) 699-1194

January, 1996 TOKO, Inc.

YOUR LOCAL REPRESENTATIVE IS:

1-30-96

Order this literature by: IC-109-TK11821

Page 5

Printed in U.S.A.