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UM17512 Schematic ( PDF Datasheet ) - Union Semiconductor

Teilenummer UM17512
Beschreibung VLDO Linear Regulator
Hersteller Union Semiconductor
Logo Union Semiconductor Logo 




Gesamt 8 Seiten
UM17512 Datasheet, Funktion
UM175XX
300mA, Micropower, VLDO Linear Regulator
UM175XX SOT23-5
General Description
The UM175XX series are VLDO (very low dropout) linear regulators designed for low power
portable applications. Typical output noise is only 75μVRMS and maximum dropout is just 90mV
at the load current of 150mA.The internal P-channel MOSFET pass transistor requires no base
current, allowing the device to draw only 100μA during normal operation at the maximum load
current of 300mA.
Other features include high output voltage accuracy, excellent transient response, under voltage
lockout, stability with ultralow ESR ceramic capacitors as small as 1μF, short-circuit and thermal
overload protection and output current limiting.
The UM175XX series are available in a low profile SOT23-5 package.
Applications
z Bluetooth/802.11 Cards
z PDAs and Notebook Computers
z Portable Instruments and
Battery-Powered Systems
z Cellular Phones
Features
z Very Low Dropout: 90mV(max) at 150mA
z Maximum Input Voltage: 6.0V
z Low Noise:75μVRMS (10Hz to 100kHz)
z ±2%Voltage Accuracy at 150mA
z Fast Transient Response
z Under Voltage Lockout
z Fixed Output Voltage:
3.3V/3.0V/2.8V/2.7V/2.5V/1.8V/1.5V/1.3V/
1.2V
z Output Current Limit
z No Protection Diodes Needed
z Stable with 1μF Output Capacitor
z Short-Circuit and Thermal Overload
Protection
z Low Profile SOT23-5 Package
Pin Configurations
Top View
UM175XX
M: Monthly Code
SOT23-5
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http://www.union-ic.com Rev.02 Oct.2008
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UM17512 Datasheet, Funktion
UM175XX
Figure 2
Figure 3
Additionally, some ceramic capacitors have a piezoelectric response. A piezoelectric device
generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric
accelerometer or microphone works. For a ceramic capacitor the stress can be induced by
vibrations in the system or thermal transients. The resulting voltages produced can cause
appreciable amounts of noise, especially when a ceramic capacitor is used for noise bypassing.
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http://www.union-ic.com Rev.02 Oct.2008
6/8

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