TOKO TK11811MTL Datasheet
TK11811
20P
DC-DC CONVERTER
FEATURES
■ Miniature Package (SOT-23L)
■ Low Start-up Voltage [0.6 V (typ.)]
■ Few External Components
■ Selectable Output Voltage (1.9 V or 2.8 V)
■ High and Low Current Optimized Designs
DESCRIPTION
The TK11811 is a low power, low input voltage DC-DC
converter.
This device can be optimized for use in high or low current
applications through component selection. The output
voltage is selectable for 1.9 or 2.8 V operation and can be
trimmed to any voltage in between.
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
TK11811
V
IN
F
B
OSC
T
GND
V
OUT
The TK11811 is available in a miniature SOT-23L surface
mount package.
BLOCK DIAGRAM
V
IN
F
B
OSC V
OUT
ORDERING INFORMATION
TK11811M
V
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
OSCILLATOR
ref
-
+
GND
January 1999 TOKO, Inc. Page 1
T
TK11811
ABSOLUTE MAXIMUM RATINGS
Input Voltage ............................................................ 16 V
Power Dissipation (Note 1) ................................ 200 mW
Junction Temperature ........................................... 150 °C
TK11811 ELECTRICAL CHARACTERISTICS
Test Conditions: TA = 25 °C, V
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
= 2.9 V (V
OUT
to T open), unless otherwise specified.
OUT
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-10 to +65 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
V
NI
V
TRATS
I
NI
V
TUO
V
I
)WOL(TUO
TUO
tnerruCtupnI
egatloVtuptuO
tnerruCtuptuO
geReniLnoitalugeReniLI
geRdaoLnoitalugeRdaoLV
FFEycneiciffEV
F
CSO
∆V
/∆T
TUO
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.
200 mW when in Free Air. Derate at 1.6 mW/°C for operation above 25 °C.
egnaRegatloVylppuS 6.041V
egatloVpu-tratSI
)WOL(egatloVtuptuO
ycneuqerFrotallicsOV
tneiciffeoCerutarepmeTV
TUO
V
NI
V
NI
V
NI
V
NI
V
NI
V
NI
V
NI
TUO
NI
NI
NI
NI
Am0=6.057.0V
I,V1.1=
TUO
I,V4.1=
TUO
I,V1.1=
TUO
I,V4.1=
TUO
I,V1.1=
VotT
TUO
TUO
Am3=0.11Am
Am3=3.8Am
Am3=58.2V
Am3=07.258.20.3V
,Am3=
detcennoc
57.109.150.2V
V1.1=0.45.4Am
V4.1=0.68.6Am
V1.1,Am3= ≤ VNI≤ V0.201Vm
Am5.0,V1.1= ≤ I
I,V4.1=
TUO
I,V4.1=
TUO
I,V4.1=
TUO
≤ Am354Vm
TUO
Am3=3627%
)2etoN(,Am3=003zHk
Am3=7.0C°/Vm
Page 2 January 1999 TOKO, Inc.
TEST CIRCUIT
R
1
V
IN
C
10 µF
10 KΩ
C2 3300 pF
+
1
L
13
R
2
46
22 KΩ
V
IN
F
B
Di
OSC
T
GND
V
OUT
Note: Di: IS2837,38 (NEC)
L: Toko 395KN-0369AQ
Toko PS5CDL-1639X
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise specified.
TK11811
(See “Voltage
Adjustment Circuit”)
V
OUT
+
C
3
10 µF
OUTPUT VOLTAGE VS. OUTPUT
CURRENT (V
OUT
= 1.9 V)
2.5
2.0
(V)
1.5
OUT
V
1.0
1.0 V
.5
0
0 2 4 6 8 10
0.8 V
V
= 0.6 V
IN
I
OUT
EFFICIENCY
CURRENT (V
(mA)
VS.
OUT
OUTPUT
= 2.8 V)
100
1.2 V
50
EFF (%)
1.0 V
1.2 V
1.4 V
1.6 V
1.4 V
1.6 V
EFFICIENCY VS. OUTPUT CURRENT
(V
= 1.9 V)
OUT
100
50
EFF (%)
1.0 V
0.8 V
VIN = 0.6 V
0
0 5 10
I
(mA)
OUT
INPUT CURRENT
VOLTAGE (I
200
OUT
V
OUT
(µA)
IN
I
1.2 V
VS.
INPUT
= 0 mA)
= 2.8 V
1.6 V
1.4 V
OUTPUT VOLTAGE
CURRENT (V
OUT
VS.
= 2.8 V, I
5
4
(V)
3
OUT
V
2
1
VIN = 0.6 V
0
.5 5 10
1.0 V
0.8 V
1.2 V
I
(mA)
OUT
OUTPUT VOLTAGE DRIFT
VS. TEMPERATURE
+50
(mV)
0
OUT
∆V
OUTPUT
= 0 mA)
LOAD
1.6 V
1.4 V
0.8 V
V
= 0.6 V
IN
0
0 5 10
I
(mA)
OUT
100
V
OUT
= 1.9 V
0 10 20
VIN (V)
-50
-50 0 50 100
TA (°C)
January 1999 TOKO, Inc. Page 3
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