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参数资料
| 型号： | TK7403232LCLEX |
| 厂商： | TOKO INC |
| 元件分类： | 固定正电压多路输出LDO稳压器 |
| 英文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封装： | SOT-23, 8 PIN |
| 文件页数： | 12/30页 |
| 文件大小： | 913K |
| 代理商： | TK7403232LCLEX |
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TOKO@Inc.
IC Data Sheet
TK740xxL
May 2001
GC3-H010 /D
Page 2
TK740xxL
Dual Low DropOut regulator with independent on/off switches
Features
E
2Ch Low Drop-Out regulator built into one package
EIndependent on/off Switch for each LDO regulator (high on)
EAbility to set out put voltage by external resistors
EWide operating voltage rangei1.8V`14.5Vj
EVery good Ripple Rejection Ratioi84dBj
EVery small Drop Out Voltage Side A 90mV / 100mAF160mV /200mA
Side B 80mV / 50mAF135mV / 100mA
iA side // B sidej:Vdrop=70mV/100mAF125mV/200mAF180mV/300mA
EVery small quiescent current (45
A /chj
EHigh output voltage accuracy i}60mV or}2.0%@Iout5mA @1.3V`5.0Vj
ELow value output capacitor requirements for stability (CLMin =0.1
F)
EOperates with Low ESR ceramic capacitors in most applications
EBuilt-in reverse bias voltage protection. Built-in thermal / short circuit current
protection.
EWide operating ambient temperature range (-40to +85)
ESOT23L 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 (45
A/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 0.1
F 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
A 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 150DThe 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.
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