TS1583 datasheet(4/7 Pages) TSC

部品番号	TS1583

部品情報	1.5A Dual Input Low Dropout Positive Voltage Regulator

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メーカー	TSC [Taiwan Semiconductor Company, Ltd]

ホームページ	http://www.taiwansemi.com

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TS1583 series

4-4

2003/12 rev. A

Application Information

Application

The TS1583 is a low dropout regulator designed to

make used of multiple power supplies, present in most

systems, to reduce the dropout voltage. One of the

advantages of the two supply approach is maximizing

the efficiency. The second supply is at least 1V greater

than output voltage and is providing the power for the

control circuitry and supplies the drive current to the

NPN output transistor. This allows the NPN output

transistor to be driven into saturation. For the control

voltage the current requirement is small equal to about

1% of the output current or approximately 50mA for a

1.5A load. This drive current becomes part of the

output current. The maximum voltage on the Control

Pin is 15V. The maximum voltage at the Power in is

7V. By tying the control and power inputs together the

TS1583 can also be operated as a single supply

device. In single supply operation the dropout will be

determined by the minimum control voltage.

Both the fixed and adjustable versions have remote

sense pins, permitting very accurate regulation of

output voltage. As a result, over and output current

range of 100mA to 1.5A, the typical load regulation is

less than 1mV. For the fixed voltages the adjust pin is

brought out allowing the user to improve transient

response by bypassing the internal resistor divider.

Optimum transient response is provided using a

capacitor in the range of 0.1uF to 1uF for bypassing the

adjust pin.

The new generation of microprocessors cycle load

current from several hundred million amperes to

several amperes in tens of nanoseconds. Output

voltage tolerances are tighter and include transient

response as part of the specification. Designed to meet

the fast current load step requirements of these

microprocessors, the TS1583 also saves total cost by

needing less output capacitance to maintain regulation.

Typical applications for the TS1583 include 3.3V to

2.5V conversion with a 5V control supply, 5V to 4.2V

conversion with a 12V control supply or 5V to 3.6V

conversion with a 12V control supply. It is easy to

obtain dropout voltages less than 0.5V at 0.8A along

with excellent static and dynamic specifications. It is

fully

protected

against

over

current

and

over

temperature conditions.

Grounding and Output Sensing

The TS1583 allows true Kelvin sensing for both the

high & low side of the load. A result the voltage

regulation at the load can be easily optimized. Voltage

drops due to parasitic resistances between the

regulator and the load can be placed inside the

regulation loop. The advantages of remote sensing are

illustrated in Figure 1 through 3.

Figure 1 show the device connected as a conventional

3 terminal regulator with the Sense lead connected

directly to the output of the device. Rp is the parasitic

resistance of the connections between the device and

the load. Trace A of Figure 3 illustrates the effect of Rp

Figure 1. Conventional Load Sensing

Figure 2 show the device connected to take advantage

of the remote sense feature. The Sense Pin and the

top of the resistor divider are connected to the top of

the load; the bottom of the resistor divider is connected

to the bottom of the load.

Figure 2. Remote Load Sensing

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