TOKO Inc.
IC Data Sheet
TK740xxL
TK740xxL
Dual Low DropOut regulator with independent on/off switches
Features
・
2Ch
Low Drop-Out regulator built into one package
・Independent
on/off Switch for each LDO regulator (high on)
・Ability
to set out put voltage by external resistors
・Wide
operating voltage range（1.8V∼14.5V）
・Very
good Ripple Rejection Ratio（84dB）
・Very
small Drop Out Voltage Side A 90mV / 100mA：160mV /200mA
Side B 80mV / 50mA：135mV / 100mA
（A
side // B side）:Vdrop=70mV/100mA：125mV/200mA：180mV/300mA
・Very
small quiescent current
(45µA /ch）
・High
output voltage accuracy
（±60mV
or±2.0%
Iout＝5mA
1.3V∼5.0V）
・Low
value output capacitor requirements for stability (
CL
Min
=0.1µF)
・Operates
with Low ESR ceramic capacitors in most applications
・
Built-in reverse bias voltage protection. Built-in thermal / short circuit current
protection.
・Wide
operating ambient temperature range (-40℃ to +85℃)
・SOT23L
8-pin surface mount package
Description
The TK740xxL is an integrated circuit with a silicon monolithic bipolar structure. The regulator is of the
low saturation voltage output type with very little quiescent current (45µA/ch)
The TK740xx Dual Ultra Low-Drop-Out regulator operates from a 1.8V to 14.5V input supply voltage
range. The A- Side delivers up to 200mA output current and the B-Side delivers up to 120mA output
current over the full temperature range.
The TK740xx features very high stability in both DC and AC. The capacitor on the output side provides
stable operation with 0.1µF with 1.8V≦Vout. A capacitor of any type can be used; however, the larger
this capacitor is, the better the overall characteristics are.
The TK740xx makes it very suitable for portable and battery powered applications. TK740xx has
independent on/off control functions. The internal switches can each be controlled by electric levels.
The device is in the ON State when the control pin is pulled to a logic high level. An internal PNP pass
transistor is used to achieve a low dropout voltage of 90mV (typ.) at 50mA load current. The TK740xx
has an exceptionally low quiescent current of 45
µA
at no load and 0.4mA with a 50mA load. The standby
current is typically 100pA. The internal thermal shutdown circuitry limits the junction temperature to
below 150℃．The load current is internally monitored and the device will be shutdown by a short circuit
or excessive current condition at the output. The TK740xxL provides low noise performance by using the
external noise bypass capacitor Cfb. The output voltage can be changed by using external resistors. A
special good point is the ripple rejection ratio. A value of 80dB at 1kHz and 83dB at 400Hz can be
obtained.
May 2001
GC3-H010 /D
Page
2
TOKO Inc.
Parameter
Supply voltage
Storage Temperature Range
Reverse Bias
Control pin
Power Dissipation
Thermal protection
Operating
Temperature Range
Voltage Range
IC Data Sheet
Absolute Maximum Ratings
Symbol
Rating
Unit
V
℃
V
V
(Mounted on board
℃
TK740xxL
Ta=25℃
Vcc
-0.4∼16
Ｔstg
-55∼150
VR Max
-0.4∼10
Vcont
-0.4∼Vop
Ｐd
Max
Internal limited
Ohp
140
Condition
Ｔop −30∼80(−40∼85)
℃
Ta
Ｖop
1.8∼14.5
Ｖ
600mW)
Short circuit current: Side A
Short circuit current: Side B
Ishort
Ishort
430
330
mA
mA
(
fold-down protection.)
Electrical Characteristics(C rank)
Parameter
Output voltage
Line Regulation
Quiescent current
Standby current
V test=Vout
Typ
+1v；Vcont=1.8V（Ta=25
℃）
Symbol
Vout
LinReg
I½
Istandby
Condition
Refer to Table 1
Iout=5mA
Vtest=Vout
Typ
+1v∼to increase 5V
；Iout=5mA
Vtest-Max 18V
Min
Typ
0.0
45
0.0
Max
5.0
75
0.1
1.29
5
0.8
Unit
mV
µA
µA
V
µA
V
V
mV
mV
Common
Iout=0mA Except Icont
Vcc=10V
Off mode
Feedback term. Volt
Vfb
1.11
1.19
on/off control
Pull
down resistor for control terminal isn’t built in.
1.8
Control current
Icont
Vcont=1.8V On mode
Control voltage
Vcont
Output On
Output Off
Load regulation
LoaReg
Vdrop
Iout=5mA∼100mA
Iout=5mA∼200mA
Ｉout=100mA
Ｉout=150mA
Ｉout=200mA
Drop out voltage
Max. output current
Vdrop
Iout
Max
（14）
（33）
90
125
160
1.8
（30）
（70）
150
180
250
Note 1
Side A
Drop out voltage
1 . 3 V
≦V
o u t
≦2
. 0 V
：N
o r e g u l a t i o n
Because of Vop
Min
=1.8V
290
380
Vout: 10% Down point、Note 2
mA
Iout=5mA∼100m
Ｉout=50mA
Ｉout=100mA
（17）
80
135
（40）
125
220
mV
mV
Load regulation: Note 1
LoaReg
Side B
Drop out voltage
Drop out voltage
Max output current
Vdrop
Vdrop
out
Max
ΔVo/Ta
1 . 3 V
≦V
o u t
≦2
. 0 V
N o r e g u l a t i o n
Because of Vop
Min
=1.8V
190
280
Vout: 10% Down point、Note 2
mA
Ｉo=5mA Reference
Value
70 PPM/℃
Vout Temp. coefficient
The operation of -30℃-80℃ is guaranteed in the design by a usual inspection.
Note 1: This value depends on the output voltage. (It is a value of Vout=3V device. The value of details is
described to Electrical specifications)
Note 2:The output current is limited by the power dissipation of the total of both sides.
Parameters with only typical values are just reference. (Not guaranty)
General Note:
Limits are guaranteed by production testing or correction techniques using Statistical Quality Control (SQC)
methods. Unless otherwise noted. Vtest=Vout
Typ
+1v；IL=1mA（Tj=25
℃）The
operation of -30
℃-80℃
is
guaranteed in the design by a usual inspection.
General Note: Exceeding the “Absolute Maximum Rating “ may damage the device
General Note: Ripple rejection is approximately 84dB
May 2001
GC3-H010 /D
Page
5
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