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 interfer-
ence 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.
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 V
O
, 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.
VFB
5
821 21
A
TK11821M
OSC
VD
BYPASS
VO
1
2
3
4
8
7
VFB
GND
6 VIN
5
T1
BLOCK DIAGRAM
OSC
1
VD
2
4
VO
ORDERING INFORMATION
TK11821M
Tape/Reel Code
VIN
6
Feedback
Control
GND
7
5
T1
BYPASS
V REF
3
TAPE/REEL CODE
BX:
TL:
MG:
Bulk/Bag
Tape Left
Magazine
January, 1996 TOKO, Inc.
1-30-96
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
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
ELECTRICAL CHARACTERISTICS
Test conditions: V
IN
= 0.9 V
→
2.0 V
Operating Conditions: V
IN
= 1.1 V, T
A
= 25
°C
unless otherwise specified.
SYMBOL
I
CC
V
O
I
O
Load Reg
∆V
O
/T
A
V
OSC-S
f
OSC
PARAMETER
Input Current
Output Voltage
Output Current
Load Regulation
Output Voltage
Temperature Dependency
Oscillation Starting Voltage
Oscillation Frequency
TEST CONDITIONS
I
O
= 0 , V
O
= 10 V
I
O
= 50
µA,
V
O
= 10 V
I
O
= 0
µA,
1.6 V
≤
V
IN
≤
2.0 V
V
O
- T1 shorted, I
O
= 50
µA
V
O
- T1 shorted
Note 2
V
O
= 24 V, I
O
= 50
µA
V
O
= 10 V, I
O
= 50
µA
I
O
= 0
µA
I
O
= 0
µA,
Note 2
0.75
4.0
22.5
9.6
90
MIN
TYP
3.5
5.5
24.0
10.0
100
0.1
+2.3
-1.5
0.35
MAX
7.0
9.0
25.5
10.4
UNITS
mA
mA
V
V
µA
%
mV/°C
mV/°C
V
MHz
ELECTRICAL CHARACTERISTICS
Test conditions: V
IN
= 1.8 V
→
10.0 V
Operating Conditions: V
IN
= 3.0 V, T
A
= 25
°C
unless otherwise specified.
SYMBOL
I
CC
V
O
I
O
Load Reg
∆V
O
/T
A
V
OSC-S
f
OSC
Note 1:
Note 2:
Note 3:
Note 4:
PARAMETER
Input Current
Output Voltage
Output Current
Load Regulation
Output Voltage
Temperature Dependency
Oscillation Starting Voltage
Oscillation Frequency
TEST CONDITIONS
I
O
= 0 , V
O
= 10 V
I
O
= 50
µA,
V
O
= 10 V
I
O
= 0
µA,
1.6 V
≤
V
IN
≤
2.0 V
V
O
- T1 shorted, I
O
= 50
µA
V
O
- T1 shorted
Note 2
V
O
= 24 V, I
O
= 50
µA
V
O
= 10 V, I
O
= 50
µA
I
O
= 0
µA
I
O
= 0
µA,
Note 2
MIN
TYP
3.5
5.5
24.0
10.0
100
0.1
+2.3
-1.5
MAX
7.0
9.0
25.5
10.4
UNITS
mA
mA
V
V
µA
22.5
9.6
90
0.35
%
mV/°C
mV/°C
V
1.5
3.5
MHz
Power dissipation must be derated at the rate of 3 mW/°C for operation at T
A
= 25
°C
and above.
Use the same value for L that was used in the measurement circuit.
Output Voltage Variation = (∆V
O1
/V
O1
) X 100 (%),
∆V
O1
= V
O1
(no load) - V
O1
(I
O
= 50
µA).
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.
1-30-96
Page 2
January, 1996 TOKO, Inc.
TK11821
TEST CIRCUIT
V
IN
The value of the circuit constants
against the input voltage.
+
L
1
3
6
4
1
µF
V
O
The output voltage is 24 V.
When connected between the VO
and the T terminal, the output
voltage will be 10 V.
821
GND
0.1
µF
T
22
µF
INPUT
VOLTAGE
0.9 V to 2 V
C
A
C
B
TOKO COIL
PART NUMBER
PS5CDLN-1250
PS5CDLN-1303
33 pF 10 pF
1.8 V to 10 V 820 pF 33 pF
C
A
C
B
C2 0.1
µF
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT VOLTAGE vs. INPUT VOLTAGE
10 V OUTPUT
10
0
µA
40
µA
80
µA
120
µA
V
O
(V)
5
T
A
= 25
°C
5
VIN = 2 V
TA = 25
°C
0
0
0.4
0.8
V
IN
(V)
1.2
1.6
2.0
TPC01
10
VIN = 3 V
IIN (mA)
V
O
(V)
0
0
OUTPUT VOLTAGE vs. INPUT VOLTAGE
24 V OUTPUT
T
A
= 25
°C
24
IO = 0
µA
IO = 40
µA
IIN (mA)
V
O
(V)
IO = 80
µA
10
IO = 120
µA
10
20
IO = 40
µA
V
O
(V)
0
0
0.8
1.6
V
IN
(V)
2.4
3.2
4.0
TPC04
0
0
0.8
1.6
V
IN
(V)
2.4
3.2
4.0
TPC05
January, 1996 TOKO, Inc.
+
OUTPUT VOLTAGE vs. OUTPUT CURRENT
10 V OUTPUT
V
IN
= 4 V
10
INPUT CURRENT vs. INPUT VOLTAGE
10 V OUTPUT
T
A
= 25°C
IO = 120
µA
IO = 80
µA
IO = 40
µA
5
VIN = 1 V
0.2
0.4
0.6
I
O
(mA)
0.8
1.0
TPC02
IO = 0
µA
0
0
0.4
0.8
VIN (V)
1.2
1.6
2.0
TPC03
INPUT CURRENT vs. INPUT VOLTAGE
24 V OUTPUT
T
A
= 25°C
10
OUTPUT VOLTAGE vs. OUTPUT CURRENT
24 V OUTPUT
T
A
= 25°C
IO = 120
µA
IO = 80
µA
5
V
IN
= 2 V
3V
4V
5V
IO = 0
µA
0
0
0.2
0.4
0.6
I
O
(mA)
0.8
1.0
TPC06
1-30-96
Page 3
TK11821
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
10.3
10.2
V
O
= 10 V
V
O
(V)
V
O
(V)
OUTPUT VOLTAGE vs.
TEMPERATURE
24.6
24.5
24.4
24.3
10.1
10.0
9.9
V
O
= 24 V
24.2
0
-30 -20
0
20
TEMP (°C)
40
60
TK11821 • TPC07
TYPICAL AM/FM VARACTOR DIODE BIAS CIRCUIT
VIN
T
+
1
GND
3
4
1
PIN
6
821
0.1
h
C
A
C
B
C
2
AM HIGH
FM LOW
TR
TK 11821 BD FIG 01
Page 4
1-30-96
+
January, 1996 TOKO, Inc.
TK11821
PACKAGE OUTLINES
MFP-8
0.76
8
5
1.27
4.4
± 0.2
e
1.27
1
4
Recommended Mount Pad
e1
5.5
± 0.2
0.5
5.0
± 0.2
1.7max
± 0.2
+0.1
-0.05
0.4
+0.1
-0.01
e
0.1min
1.4
1.27
0.1
6.0
± 0.3
0.12 M
0.15
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.
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