TOKO TK11830MTL Datasheet
TK11830
20P
POSITIVE-TO-NEGATIVE DC-DC CONVERTER
FEATURES
■ Positive-to-Negative Converter
■ Adjustable Output Voltage
■ On/Off Control
■ Thermal Protection Sensor
■ Broad Operating Voltage Range
■ Miniature Package (SOT-23L)
DESCRIPTION
The TK11830 is a positive-to-negative DC-DC converter.
This IC converts a positive input voltage into a regulated
negative output voltage. This DC-DC converter features
an On/Off function with an active low control. The internal
voltage reference provides a stable output voltage which
can be set from -0.5 to -12.5 V. The thermal protection
feature provides oscillator shutdown in the event of an
overload condition. The wide input voltage range of 2.5 to
15 V and a 60 mA output current capability allow flexible
operation in a large number of applications.
APPLICATIONS
■ Pagers
■ Cassette Recorders
■ Cordless Telephones
■ Portable Instrumentation
■ Radio Control Systems
■ Battery Operated Equipment
■ Local Area Network (LAN) Receivers
TK11830
V
ref
CONTROL
V
IN
V
FB
GND
V
OSC
The TK11830 is available in a miniature SOT-23L surface
mount package. Optimized Toko inductors are available.
ORDERING INFORMATION
BLOCK DIAGRAM
TK11830M
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
V
FB
THERMAL
PROTECTION
V
ref V
January 1999 TOKO, Inc. Page 1
COMP
GND
OSCILLATOR
CONTROL
REFERENCE
VOLTAGE
CONTROL
V
OSC
IN
TK11830
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................... 16 V
Operating Voltage ............................................Min. 2.5 V
Power Dissipation (Note 1) ................................ 400 mW
Storage Temperature Range ................... -55 to +150 °C
TK11830 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 5 V, L = 470 µH, TA = 25 °C, unless otherwise specified.
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
Operating Temperature Range ...................-20 to +75 °C
Junction Temperature ........................................... 150 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
V
V
∆V
I
I
NI
fer
egatloVtupnIV
egatloVecnerefeR32.182.133.1V
fotneiciffeoCerutarepmeT
fer
)FFO(NI
egatloVecnerefeR
nwodtuhStatnerruCtupnI
geReniLnoitalugeReniL
geRdaoLnoitalugeRdaoLV
TUO
tnerruCtuptuOV
V|+
NI
T
A
R
V
NI
V
NI
I
TUO
TUO
TUO
| ≤ V615.251V
TUO
08+ot03-= ° C1.0±/Vm ° C
TNOC
k003= ,Ω ,FFOtuptuO
V5=
V,V01ot5.2=
TUO
,V5-=
Am02=
I,V5-=
TUO
Am05ot1=02001Vm
52001Aµ
0105Vm
V5-=0506Am
LANIMRETLORTNOCFFO/NO
V
I
TNOC
V
V
Note 1: Power dissipation is 400 mW (internally limited) when mounted as recommended. Derate at 3.2 mW/°C for operation above 25 °C.
Gen Note: Output capacitor should have low ESR at reduced temperatures if used below 0 °C.
Gen Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
)NO(TNOC
)FFO(TNOC
tnerruClanimreTlortnoC
)NO(egatloVlortnoCR
)FFO(egatloVlortnoCR
TNOC
V
TNOC
TNOC
TNOC
R,V4.0=
TNOC
R,V0.5=
TNOC
k003= ,Ω NOtuptuO4.0V
k003= ,Ω FFOtuptuO2.2V
k003= Ω 2.0Aµ
k003= Ω 0.3Aµ
Page 2 January 1999 TOKO, Inc.
TK11830
Note: Toko Inductor (470 µH): 646CY-471M
or 636CE-471K (D73C)
V
= (V
OUT
where V
/ 5) x [ 1-4 x (R2 / R1)],
ref
= 1.28 V
ref
V
CONT
(ON/OFF)
+V
IN
GND
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT VOLTAGE
LOAD CURRENT
V
= -3 V
-3.1
-3.0
OUT
VIN = 8 V
VS.
R
CONT
300 kΩ
TEST CIRCUIT
R
20 k
+
C
ref
1 µF
V
ref
CONTROL
V
IN
C
IN
47 µF
1
Note: If a noise filter is desired, select:
V
FB
GND
V
OSC
RF = (50 to 150 mV) / I
where I
C
FB
0.1 µF
SD
L
R
103 KΩ
C
47 µF
+
2
V
OUT
OUT
= Load Current
OUT
R
F
,
OUT
V
O
C
F
GND
OUTPUT VOLTAGE AND EFFICIENCY
VS.
LOAD CURRENT
V
= -5 V
-5.1
V
OUT
OUT
VIN = 3 V
100
-5.0
(V)
-2.9
OUT
V
-2.8
VIN = 3 V
-2.7
-2.6
0 20 40 60 80 100
I
(mA)
LOAD
OUTPUT VOLTAGE
LOAD CURRENT
-5.1
V
OUT
-5.0
(V)
-4.9
OUT
V
-4.8
VIN = 3 V
VIN = 5 V
-4.7
-4.6
0 20 40 60 80 100
I
(mA)
LOAD
VIN = 5 V
VS.
= -5 V
VIN = 8 V
(V)
-4.9
OUT
V
-4.8
EFFICIENCY
-4.7
-4.6
0 6 12 18 24 30
I
(mA)
LOAD
OUTPUT VOLTAGE AND EFFICIENCY
-5.1
VS.
LOAD CURRENT
V
OUT
V
OUT
VIN = 5 V
-5.0
(V)
-4.9
OUT
V
-4.8
EFFICIENCY
-4.7
-4.6
0 10 20 30 40 50
I
(mA)
LOAD
= -5 V
50
100
50
(%)
EFF
(%)
EFF
January 1999 TOKO, Inc. Page 3
TK11830
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
OUTPUT VOLTAGE
LOAD CURRENT
V
LOAD
OUT
(mA)
TA = -50 °C
V
OUT
VIN = 5 V
-10.0
-9.9
(V)
-9.8
OUT
V
-9.7
-9.6
-9.5
-5.1
-5.0
(V)
-4.9
OUT
V
-4.8
-4.7
VIN = 3 V
VIN = 5 V
0 20 40 60 80 100
I
OUTPUT VOLTAGE VS.
LOAD CURRENT
VIN = 3 V
VS.
= -10 V
= -5 °V
VIN = 8 V
OUTPUT VOLTAGE AND EFFICIENCY
-5.1
-5.0
(V)
-4.9
OUT
V
-4.8
-4.7
-4.6
0 20 40 60 80 100
OUTPUT VOLTAGE AND EFFICIENCY
-5.1
-5.0
(V)
-4.9
OUT
V
-4.8
-4.7
VS.
LOAD CURRENT
V
OUT
I
LOAD
VS.
INPUT VOLTAGE
I
= 10 mA
LOAD
V
OUT
VIN = 10 V
EFFICIENCY
(mA)
TA = -50 °C
I
= 20 mA
LOAD
EFFICIENCY
= -5 V
100
50
100
50
(%)
EFF
(%)
EFF
-4.6
0 20 40 60 80 100
I
(mA)
LOAD
OUTPUT VOLTAGE
LOAD CURRENT
I
LOAD
TA = 25 °C
V
OUT
VIN = 5 V
(mA)
-5.1
-5.0
(V)
-4.9
OUT
V
-4.8
-4.7
-4.6
VIN = 3 V
0 20 40 60 80 100
VS.
= -5 °V
VIN = 8 V
-4.6
0 4 8 12 16 20
V
(V)
IN
OUTPUT VOLTAGE AND EFFICIENCY
-5.1
-5.0
(V)
-4.9
OUT
V
-4.8
-4.7
-4.6
0 4 8 12 16 20
VS.
INPUT VOLTAGE
TA = 25 °C
I
LOAD
I
= 10 mA
LOAD
V
IN
= 20 mA
EFFICIENCY
(V)
100
50
(%)
EFF
Page 4 January 1999 TOKO, Inc.
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