LR1108资料

UNISONIC TECHNOLOGIES CO., LTD

LR1108

1A FAST ULTRA LOW DROPOUT LINEAR REGULATOR

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DESCRIPTION

321

CMOS IC

SOT-89154The UTC LR1108 operate from a +2.5V ~ +7.0V input supply as fast ultra low-dropout linear regulators. Wide output voltage range options are available. The fast response characteristic to make UTC LR1108 suitable for low voltage microprocessor application.The low quiescent current operation and low dropout quality caused by the CMOS process.

The UTC LR1108 has ultra low dropout voltage; 300mV at 600mA load current typically.

The ground pin current is typically 200uA at 1mA load current. ERROR Flag: When the output voltage drops 10% below nominal value Error flag goes low.

Output Voltage Precision: Multiple output voltage options are available and ranging from 1.2V ~ 5.0V at room temperature with a guaranteed accuracy of ±1.5%, and ±3.0% when varying line, load and temperature.

SOT-25*Pb-free plating product number: LR1108L

󰂄 FEATURES

* Ultra low dropout voltage * Low ground pin current * 0.04% load regulation

* The guaranteed output current is 1A DC * Output voltage accuracy ± 1.5%

* ERROR flag indicates output status * Low output capacitor required

* Overtemperature protection and overcurrent protection

󰂄 ORDERING INFORMATION

Ordering Number

Package

Normal Lead Free Plating LR1108-xx-AB3-A-R LR1108L-xx-AB3-A-RSOT-89LR1108-xx-AB3-C-R LR1108L-xx-AB3-C-RSOT-89LR1108-xx-AF5-R LR1108L-xx-AF5-R SOT-25

Pin Assignment

Packing

123 4 5 GOI - - Tape Reel GI O- - Tape Reel I GSDERROR O Tape Reel

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LR1108 CMOS IC

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MARKING INFORMATION

VOLTAGE CODE PIN CODE PIN 1PIN 2PIN 3PIN 4PIN 5MARKING PACKAGE A GND VOUTSOT-89 15 :1.5V 18:1.8V 25:2.5V 2J:2.85V 33:3.3V SOT-25 C GND VIN VIN - - VOUT SD - - ERROR321󰀎 VIN GNDVOUT SPXXLead Plating45󰂄 PIN DESCRIPTION Pin Description for SOT-89 Package PIN CODE & NO. PIN NAMEI/O DESCRIPTION A C 2 3 VOUT O Output Voltage 1 1 GND Ground 3 2 VIN Input Supply Pin Description for SOT-25 Package PIN NO. PIN NAME I/O DESCRIPTION 1 VIN Input supply 2 GND Ground Shutdown LR1108 enable; when the SD pin connects to GND will shutdown the 3 SD I LR1108; At normal operation, SD must be tied to VDD through a 10KΩ pull up resistor. Error flag, active low; when the output dropout of regulation due to low input O 4 voltage, the LR1108 produces a logic low signal at the ERROR pin. ERROR 5 VOUT O Output voltage

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LR1108 CMOS IC

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BLOCK DIAGRAM

VIN

SDVOUT

ERRORGND

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LR1108 CMOS IC

󰂄 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNITInput Voltage (Operating), (Note 10) 2.5~7.0 V VIN Input Voltage (Survival) -0.3~+7.5 V Shutdown Input Voltage VIN(SHDN) -0.3~VIN+0.3 V Output Voltage (Survival), (Note 4), (Note 5) VOUT -0.3~+7.5 V IOUT (Survival) Short Circuit Protected Maximum Voltage for ERROR Pin VIN+0.3 V Maximum Operating Current (DC) 1 A Power Dissipation (Note 2) PD Internally Limited Junction Temperature TJ +125 󰄊 Operating Temperature TOPR -40~+125 󰄊 Storage Temperature TSTG -65~+150 󰄊 Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 󰂄 ELECTRICAL CHARACTERISTICS Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. (TJ = 25󰄊, VIN = VO(NOM) + 1V, IL = 10 mA, COUT = 2.2µF, VSD = VIN-0.3V, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MINTYP MAX UNIT0 mA ≤ IL ≤ 1A -1.5 +1.5 Output Voltage Tolerance (Note 6) VOUT 0 % -3 +3 VOUT +1 ≤ VIN≤ 7.0V Output Voltage Line Regulation (Note 6) 󰂶VOUT VOUT+1VLR1108 CMOS IC

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ELECTRICAL CHARACTERISTICS(Cont.)

Note 1. Conditions for which the device is intended to be functional is indicated by operating ratings, but specific

performance limits isn’t be guaranteed. To make sure of specifications and test conditions, read Electrical Characteristics. Only for the test conditions listed the guaranteed specifications can be applied. When the device is not operated under the listed test conditions some performance characteristics may degrade. 2. Devices must be derated based on package thermal resistance at elevated temperatures. 3. The most likely parametric norm represents at 25󰄊.

4. The LR1108 output must be diode-clamped to ground. If used in a dual-supply system where the regulator load is returned to a negative supply.

5. Between the VIN and VOUT terminals the output PMOS structure contains a diode. This diode is reverse biased normally. If the voltage at the output terminal is forced to be higher than the voltage at the input terminal this diode will get forward biased. This diode can withstand 1Amp of peak current and 200mA of DC current typically.

6. Output voltage line regulation is the change in output voltage from the nominal value which is due to change in the input line voltage. Which is defined as the change in output voltage from the nominal value due to change in load current is output voltage load regulation. The load regulation and line regulation specification include the typical number only. But, the limits for load and line regulation are included in the output voltage tolerance specification.

7. Error Flag hysteresis and threshold are specified as regulated output voltage’s percentage.

8. At which the output drops 2% below the normal value dropout voltage is defined as the minimum input to output differential voltage. Only to output voltages of 2.5V and above dropout voltage specification applies. For output voltages below 2.5V, since the minimum input voltage is 2.5V, the drop-out voltage is nothing but the input to output differential.

9. Specification has been tested at −40󰄊 ≤ TJ ≤ 85󰄊cause under shutdown conditions the temperature rise of

the device is negligible.

10. The minimum operating VIN value is equal to [VOUT(NOM) + VDROPOUT] or 2.5V, just the greater.

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LR1108 CMOS IC

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TYPICAL APPLICATION CIRCUIT

UTC assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, orother parameters) listed in products specifications of any and all UTC products described or containedherein. UTC products are not designed for use in life support appliances, devices or systems wheremalfunction of these products can be reasonably expected to result in personal injury. Reproduction inwhole or in part is prohibited without the prior written consent of the copyright owner. The informationpresented in this document does not form part of any quotation or contract, is believed to be accurateand reliable and may be changed without notice. www.unisonic.com.tw UNISONIC TECHNOLOGIES CO., LTD 6 of 6 QW-R102-031.󰀣