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TS9020 датащи(PDF) 3 Page - Taiwan Semiconductor Company, Ltd

номер детали TS9020
подробное описание детали  200mA Dual Channel CMOS LDO with Enable Function
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производитель  TSC [Taiwan Semiconductor Company, Ltd]
домашняя страница  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS9020 датащи(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

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Preliminary
TS9020
200mA Dual Channel CMOS LDO
with Enable Function
3/6
Version: Preliminary
Function Description
The TS9020 is a highly accurate, dual, low noised, CMOS LDO voltage regulators with enable function. The output
voltage for each regulator is set independently by fuse trimming. As illustrated in function block diagram, it consists of a
reference, error amplifier, a P-channel pass transistor, an ON/OFF control logic and an internal feedback voltage
divider. The band gap reference is connected to the error amplifier, which compares the reference with the feedback
voltage and amplifies the voltage difference. If the feedback voltage is lower than the reference voltage, the pass-
transistor gate is pulled lower, which allows more current to pass to the VOUT pin and increases the output voltage. If
the feedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. The output
voltage is feed back through an internal resistive divider connected to VOUT pin. Additional blocks include an output
current limiter, thermal sensor, and shutdown logic.
Enable
EN1 and EN2 pin start and stop the corresponding outputs independently. When the EN pin is switched to the power
off level, the operation of all internal circuit stops, the build-in P-channel MOSFET output transistor between pins VIN
and VOUT is switched off, allowing current consumption to be drastically reduced.
Dropout Voltage
A regulator’s minimum input-output voltage differential, or dropout voltage, determines the lowest usable supply
voltage. The TS9020 use a P- channel MOSFET pass transistor, its dropout voltage is function of drain-to-source on-
resistance RDS(ON) multiplied by the load current
VDROP = VIN-VOUT = RDSON * IOUT
Current Limit
Each channel of TS9020 includes a fold back current limiter. It monitors and controls the pass transistor’s gate voltage,
estimates the output current, and limits the output current within 250mA.
Thermal Shutdown Protection
Thermal Shutdown protection limits total power dissipation of TS9020. When the junction temperature exceeds TJ=
+150°C, a thermal sensor turns off the pass transistor, allowing the IC to cool down. The thermal sensor turns the pass
transistor on again after the junction temperature cools down by 40°C, resulting in a pulsed output during continuous
thermal shutdown conditions. Thermal shutdown protection is designed to protect the TS9020 in the event of fault
conditions. For continuous operation, the absolute maximum operating junction temperature rating of TJ=+125°C
should not be exceeded.
Application Information
Like any low-dropout regulator, the TS9020 requires input and output decoupling capacitors. The device is specifically
designed for portable applications requiring minimum board space and smallest components. These capacitors must
be correctly selected for good performance (see Capacitor Characteristics Section). Please note that linear regulators
with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by
insufficient decoupling capacitance.
Input Capacitor
The TS9020 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor
(temperature characteristics X7R, X5R) in 1µF is suitable for the TS9020 application. The recommended minimum
capacitance for the device is 1µF, X5R or X7R dielectric ceramic, between VOUT and GND for stability, but it may be
increased without limit. Higher capacitance values help to improve transient. The output capacitor’s ESR is critical
because if forms a zero to provide phase lead which is required for loop stability.


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