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What is UM17513?

This electronic component, produced by the manufacturer "Union Semiconductor", performs the same function as "VLDO Linear Regulator".


UM17513 Datasheet PDF - Union Semiconductor

Part Number UM17513
Description VLDO Linear Regulator
Manufacturers Union Semiconductor 
Logo Union Semiconductor Logo 


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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
________________________________________________________________________
http://www.union-ic.com Rev.02 Oct.2008
1/8

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UM17513 equivalent
UM175XX
Applications Information
The UM175XX series are 300mA very low dropout regulators with micropower quiescent current
and shutdown. The maximum dropout is only 90mV at the load current of 150mA. Output voltage
noise is as low as 75μVRMS over a 10Hz to 100kHz bandwidth.
In addition to the low quiescent current, the UM175XX regulators incorporate several protection
features which make them ideal for use in battery-powered systems. The devices also include
current limit and thermal overload protection, and will survive an output short circuit indefinitely.
The fast transient response over comes the traditional tradeoff between dropout voltage, quiescent
current and load transient response inherent in most regulators by using a proprietary new
architecture
Output Capacitance and Transient Response
The UM175XX regulators are designed to be stable with a wide range of output capacitors. The
ESR of the output capacitor affects stability, most notably with small capacitors. A minimum
output capacitor of 1μF with an ESR of 0.3or less is recommended to ensure stability. The
UM175XX series are micropower devices and output transient response will be a function of
output capacitance. Larger values of output capacitance decrease the peak deviations and provide
improved transient response for larger load current changes. The shaded region of Figure 1 defines
the region over which the UM175XX regulators are stable. The maximum ESR allowed is 0.3.
High ESR tantalum and electrolytic capacitors may be used, but a low ESR ceramic capacitor
must be in parallel at the output. There is no minimum ESR requirement.
Figure 1
Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are
manufactured with a variety of dielectrics, each with different behavior across temperature and
applied voltage. The most common dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong
voltage and temperature coefficients as shown in Figures 2 and 3. When used with a 5V regulator,
a 10μF Y5V capacitor can exhibit an effective value as low as 1μF to 2μF over the operating
temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more
suitable for use as the output capacitor. The X7R type has better stability across temperature,
while the X5R is less expensive and is available in higher values.
________________________________________________________________________
http://www.union-ic.com Rev.02 Oct.2008
5/8


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