TOKO TK11812MTL Datasheet
TK11812
20P
DC-DC CONVERTER
FEATURES
■ Miniature Package (SOT-23L)
■ Low Start-up Voltage [0.6 V (typ.)]
■ Few External Components
■ Adjustable Output Voltage (1.5 to 15 V)
■ Wide Input Voltage Range (0.6 to 14 V)
DESCRIPTION
The TK11812 is a low power, low input voltage step-up
DC-DC converter.
This device can be set to an output of 1.5 to 15 V DC using
two resistors. The output current is dependent upon the
input voltage and ranges from 8 mA at 1.6 V to 24 mA at
3.5 V. The efficiency is over 80% for an output current of
4 mA to 32 mA with a 3.5 V input and 5 V output.
The frequency of the built-in relaxation oscillator is set by
external components. The internal voltage regulator
provides a stable output voltage. Optimized Toko inductor
components are available.
APPLICATIONS
■ Pagers
■ Cassette Recorders
■ Cordless Telephones
■ Portable Instrumentation
■ Radio Control Systems
■ Mobile Radios
■ Battery Operated Equipment
■ Local Area Network (LAN) Receivers
TK11812
V
IN
F
B
OSC
FB
GND
V
OUT
The TK11812 is available in a miniature 6-pin SOT-23L
surface mount package.
BLOCK DIAGRAM
OSC
GND
V
OUT
V
ref
-
+
FB
ORDERING INFORMATION
TK11812M
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
V
IN
OSCILLATOR
F
B
June 1999 TOKO, Inc. Page 1
TK11812
ABSOLUTE MAXIMUM RATINGS
Input Voltage ............................................................ 16 V
Output Voltage ......................................................... 15 V
Power Dissipation (Note 1) ................................ 400 mW
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-10 to +65 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
Junction Temperature ........................................... 150 °C
TK11812 ELECTRICAL CHARACTERISTICS
Test Conditions: TA = 25 °C, V
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
V
NI
V
TRATS
I
NI
V
TUO
I
TUO
tnerruCtupnI
geReniLnoitalugeReniLI
geRdaoLnoitalugeRdaoLV
FFEycneiciffEV
F
CSO
∆V
/∆T
TUO
V
fer
Note 1: Power dissipation is 400 mW when mounted as recommended. Derate at 3.2 mW/°C for operation above 25 °C. Power dissipation is
Note 2: This IC is a frequency-controlled DC-DC converter, thus, the value is varied by condition.
Note 3: Output with R1/R2 set for 3.0 V nominal.
Note 4: Reference voltage is measured at FB pin (pin 6).
200 mW when in Free Air. Derate at 1.6 mW/°C for operation above 25°C.
= 3.0 V, unless otherwise specified.
OUT
egnaRegatloVylppuS6.041V
egatloVpu-tratSI
egatloVtuptuO
tnerruCtuptuO
ycneuqerFrotallicsOV
tneiciffeoCerutarepmeTV
egatloVecnerefeRV
TUO
V
NI
V
NI
V
NI
V
NI
V
NI
V
NI
TUO
NI
NI
NI
NI
NI
Am0=6.057.0V
I,V1.1=
TUO
I,V4.1=
TUO
I,V1.1=
TUO
I,V4.1=
TUO
Am3=61151Am
Am3=53.841Am
V1.1=0.45.4Am
V4.1=0.68.6Am
V1.1,Am3= ≤ VNI≤ V2.201001Vm
Am5.0,V1.1= ≤ I
TUO
I,V4.1=
TUO
I,V4.1=
TUO
I,V4.1=
TUO
I,V4.1=
TUO
Am3=3627%
Am3=4.0C°/Vm
)3etoN(,Am3=58.20.351.3V
)3etoN(,Am3=58.20.351.3V
≤ Am354031Vm
)2etoN(Am3=003zHk
)4etoN(,Am3=22.1V
Page 2
June 1999 TOKO, Inc.
TEST CIRCUIT
R
1
R
2
TK11812
V
OUT
+
10 µF
Note: Di: IS2837,38, or equivalent
L: Toko 395KN-0369AQ
Toko PS5CDL-1639X
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT VOLTAGE VS. OUTPUT
CURRENT (V
5
4
(V)
3
OUT
V
2
1
0
0 2 4 6 8 10
V
IN
0.8 V
= 0.6 V
1.2 V
I
OUT
OUT
1.0 V
(mA)
= 3.0 V)
1.4 V
1.6 V
GND
10 µF
V
IN
+
10 KΩ
Di
C
1
3300 pF
13
L
46
R
22 KΩ
3
TA = 25 °C, unless otherwise specified.
VS.
1.0 V
OUTPUT
OUT
1.2 V
(mA)
= 3.0 V)
EFFICIENCY
CURRENT (V
100
50
EFF (%)
0.8 V
V
= 0.6 V
IN
0
0 2 4 6 8 10
I
OUT
1.4 V
1.6 V
GND
Note: V
V
R1 = 100 k to 150 k
V
= V
OUT
ref
ref
[1 + (R2 / R1)]
ref
= 1.22 V
is the FB pin voltage.
OUTPUT VOLTAGE VS. OUTPUT
CURRENT (V
5
4
(V)
3
OUT
V
2
1
VIN = 0.6 V
0
0 2 4 6 8 10
0.8 V
I
OUT
OUT
1.0 V
(mA)
= 3.3 V)
1.6 V
1.4 V
1.2 V
OUTPUT VOLTAGE
CURRENT (V
5
4
OUT
VS.
OUTPUT
= 4.0 V)
100
EFFICIENCY
CURRENT (V
VS.
OUTPUT
OUT
= 4.0 V)
100
EFFICIENCY
CURRENT (V
VS.
OUT
OUTPUT
= 3.3 V)
1.6 V
1.6 V
(V)
50
EFF (%)
V
= 0.6 V
IN
0
0 2 4 6 8 10
0.8 V
I
OUT
1.0 V
1.2 V
(mA)
1.4 V
3
OUT
V
2
1.2 V
1
V
= 0.6 V
IN
0
0 2 4 6 8 10
0.8 V
I
OUT
1.0 V
(mA)
1.4 V
50
EFF (%)
1.2 V
1.0 V
0.8 V
V
= 0.6 V
IN
0
0 2 4 6 8 10
I
(mA)
OUT
1.6 V
1.4 V
June 1999 TOKO, Inc. Page 3
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