General description

LP2966 Double ultra -low voltage difference (LDO) regulator work from+2.70V to+7.0V input power. Each output is 150 mAh within the entire temperature range. Integrated circuits work with extremely low drop voltage and static currents are very suitable for battery power supply and portable applications. Each LDO in LP2966 has an independent closing function. LP2966 provides low-noise performance MSOP-8 packaging under extremely low ground pins (more information about MSOP-8 packaging, please refer to the packaging size and connection chart). A preset voltage options are available for selecting output. In addition to the voltage combination listed in, a total of 256 voltage combinations are possible.

Main specifications

Falling voltage: Linearly changes with the load current. The typical 1MA load current is 0.9 MV, and the 150mA load current is 135MV. Ground pin current: Under 1MA load current is 300 μA at 340 μA under 100mA load (with a closed pins low).

Shipping mode: When the two stops were sold down.

Error sign: The output of the leak opening road, when the corresponding output drops to the lower than the nominal value of 10%.

Precision output voltage: The multi -output voltage option voltage range is 1.8V to 5.0V, and the guaranteed accuracy of the guarantee at room temperature is ± 1%.

Features

Ultra -low drop voltage

Low -connected pins current

lt; static current under 1μA shutdown mode

Each each Independent shutdown of a LDO regulator

Output voltage accuracy ± 1%

The guarantee 150mA output current each output

Low output noise

Error sign Instructions of each output state

Provide

low output capacitance requirements (1 μF) in MSOP-8 surface installation packaging (1 μF). In most cases, N work with low ESR ceramic capacitors [[ 123]

Application

overcurrent protection

-40 ° C to+125 ° C knot temperature range

Honeycomb and wireless applications

Palm computer/laptop computer

GPS system

Tablet display

rear regulator

a USB application

Handheld Equipment and multimeter

Wireless data terminal

Other battery power supply applications

1.SD1 and SD2 must be actively active through pull -up resistors.catch. If it is not used, it is associated with VIN.

2.RROR1 and Error2 are the output of the leakage road. If not used, these pin must be grounded.

3. The minimum output capacitor is 1 μF to ensure the stability within the full load range. More capacitors improve the excellent dynamic performance and provide additional stability.

Absolutely maximum rated value (Note 1)

Storage temperature range 65 to+150 ; C

Destructory temperature. (Welding, 5 seconds) 260 ; C

Power consumption (Note 2) Internal limited

ESD rated value (Note 3) 2KV

Input power supply voltage (survival (survival (survival (survival (survival (survival ) 0.3V to 7.5V

The input voltage of the stop (survival) 0.3v to (vin+0.3V)

Maximum error voltage

Different needle

10 volts

iOUT (survival) short circuit

The protected output voltage (survival) (Note 6), (Note 7) 0.3v to to to the end (VIN+0.3V)

Work rated value (Note 1)

Input power supply voltage 2.7V to 7.0V

The input voltage of the stop 0.3v to (0.3v to ( Vin+0.3V)

Operation cross port

The temperature range

40 Maximum voltage

Error pins 10 volts

Electrical characteristics

The limit of standard fonts is suitable for TJ 25 ° C. The limit of black body characters is suitable for the entire work knot Warm range. Unless there are other regulations, VIN VO (nominal value)+1V, (Note 16), Cout 1 μF, IOUT 1MA, CIN 1 μF, vsd1 vsd2 VIN.

Electrical characteristics (continued)

The limit of the standard font is suitable for TJ 25 ° C. The limit of black body characters is suitable for the entire work knot temperature scope. Unless there are other regulations, VIN VO (nominal value)+1V, (Note 16), Cout 1 μF, IOUT 1MA, CIN 1 μF, vsd1 vsd2 VIN.

Note 1: Absolute maximum rated value indicates the limit value that may be damaged by the device. The work rated value indicates that the device is in normal working state, but does not guarantee specific performance restrictions. relatedPlease refer to the electrical characteristics of the specifications and test conditions. The guarantee specifications are only applicable to the test conditions listed. When the device does not run under the test, certain performance characteristics may be reduced.

Note 2: At high temperature, the rated value of the device must be reduced according to the heat resistance of the packaging. The equipment in the surface installation package must be reduced at θja 235 ; C/W to connect to the environment. For more information, see the part of the application about the maximum current capacity. The equipment has internal heat protection.

Note 3: The human model is a 100pf capacitor, which is transplanted by 1.5K resistance to each pin.

Note 4: 25 ; and 4 is likely to be typical parameter numbers.

Note 5: The limit is 100%production test performed under 25 ° C. By using the correlation of statistical quality control, the limit (SQC) method within the working temperature range can be guaranteed. These limits are used to calculate the national average factory quality level (AOQL).

Note 6: If you use it in the dual power system where the regulator load returns the negative power supply, the LP2966 output must be ground pipe pliers.

Note 7: The output PMOS structure contains a diode between VIN and VOUT terminals, usually reverse bias. The reversal polarity from VIN and VOUT will open this diode.

Note 8: The output voltage line adjustment refers to the change of the output voltage from the nominal value due to changes in the input line voltage.

Note 9: The output voltage load adjustment refers to the change of the output voltage from the nominal value when the load current changes from 1MA to 100mA.

Note 10: The cross -adjustment of the output voltage means that when the load current is the load current, the percentage changes between the output voltage and the nominal value change from 1MA to full load. This is an important parameter in the multi -output regulator. ΔVO1/ #8710; IOUT2 specifications are equal to the specifications of #8710; vo2/ #8710; IOUT1.

Note 11: The threshold and lag of the error sign are specified as a percentage below the specified output voltage.

Note 12: When the output voltage is dropped to 100mV below the nominal value, the input output extension of the output voltage. The drop voltage specification is only applicable to the output voltage greater than 2.7V. For the output voltage below 2.7V, the drop voltage is only an input output difference, because the minimum input voltage is 2.7V.

Note 13: The output voltage tolerance specification also includes line adjustment and load adjustment.

Electrical characteristics (continued)

Note 14: LP2966 has a discount of short circuit protection. The inflection point refers to the current when the output voltage is lower than the nominal value of 10%.

Note 15: VSDT is a corporal pins voltage threshold, lower than thatThreshold, output is disabled.

Note 16: When Vout1 Vout2, condition VIN VO (NOM)+1V is applicable. If VOUT1 u Vout2, this condition is suitable for large outputs. For example, if VOUT1 3.3V and VOUT2 5V, the condition VIN VO (NOM)+1V is only applicable to VOUT2.

Note 17: Direction delay refers to a time interval at which from low to high conversion to the output voltage from the low to high conversion to the output voltage at 5%. Treatment delay refers to the time interval between the high to low from the high to low to the output voltage to the output voltage below 50%. The external load impedance affects the attenuation of the output voltage in the shutdown mode.

Note 18: The limit of the current (0,1) of the current specification of the ground pins will be the same as the limit of the specification IGND (1,0). LP2966 double 150mA ultra -low

Typical performance characteristics, unless there are other regulations, VIN VO (nominal value)+1V, vout 3.3V, COUT 1 μF, IOUT 1MA, CIN 1 μF, vsd1 Vsd2 vin, TA 25 ; C.

Typical performance characteristics, unless there are other regulations, VIN VO (nominal value)+1V, vout 3.3V, COUT 1 μF, IOUT 1MA, CIN 1 μF, vsd1 vsd2 vin, TA 25 ; C (continued)

] Application Information

Input Capacitor Selection

LP2966 requires the minimum input capacitor between input and ground pins to prevent any impedance and supply interaction. The capacitor should be very close to the input pin. This capacitor may be any type of ceramics, pupae or aluminum. Is there any good quality? The capacitor has good temperature resistance and recommended frequency.

Output capacitor selects

LP2966 requesting each output in

correctly operated. In order to ensure stability, the capacitor should maintain its ESR (equivalent series resistance) in the stable area of the ESR curve (Figure 1 and Figure 2 applications of the entire working temperature range. The output capacitor should have a good tolerance temperature, voltage, and frequency excessive frequency. High. Output capacitors can be improved infinitely. Big capacitors provide better stability and noise performance. The output capacitor should be very close to IC.

LP2966 and the electric container cooperate with the use The effect is the best. But the ESR and capacitor values of these capacitors have a large temperature, voltage, and frequency. Therefore, the use of a capacitor should ensureElectric slag melting is within the stability range of the entire working temperature range. The output voltage is greater than 2.5V, and high -quality ceramic capacitors (such as Taiyoyuden's X7R series) can also be used with LP2966 to use load operation in applications without light (5V output options lt; 5mA). Once again, the stability range of the capacitance and ESR should be within the entire working temperature range. ESRD series polymer aluminum electrolytic capacitors come from Dubilier at Cornell University at high temperatures very stable frequency. Excellent capacitors and ESR tolerance are overvoltage, and the temperature and frequency make these capacitors very suitable for use with the LDO regulator.

Output noise

There are two specified ways to point noise or output noise density in the noise. Measurement). This type of noise is usually a function drawn on a curve as a frequency. Total output noise or broadband noise is equal to square roots and point noise on specific bandwidths, usually several frequency levels. Pay attention to the measurement unit. The spots noise measurement unit is μV/√Hz or NV/√Hz, and the total output noise measurement unit is μV (RMS). The main noise source of the low -voltage differential regulator is internal reference. In the CMOS regulator, the noise has a low -frequency component and a high -frequency component depending on the silicon area and static current. There are two ways to reduce noise: increase the area of transistor or increase internal current reference. Increasing the area will increase the size of the mold and reduce the opportunity to assemble the mold into the small packaging. Increasing the input current will increase the integrated circuit. Use ground pins and mold size, LP2966 to achieve static current in low noise performance MSOP-8 packaging.

Short -circuit reserve protection

Under the condition of short -circuit or excessive load current, LP2966 uses the internal short -circuit back regression to adjust the maximum output mechanism current. A strong negative temperature coefficient is designed in the circuit to achieve a high peak output current (the temperature of more than 400 mA in each output in the room see the typical curve). Therefore, system designers can obtain higher peak output currents using LP2966, which is suitable for LP2966's internal connector temperature to remain below 125 ° C. Please refer to the application to calculate the maximum output current capacity part of the error sign. Operation. LP2966 generates a logic low signal (error) at the wrong sign pin. The corresponding output is limited when the corresponding output is lost due to low input voltage, current limit or heat. This sign has a built -in lag. The timing diagram in FIG. 3 shows the relationship between the error and the output voltage. In this example, change the input voltage to prove the wrong functional flag.

The internal error logo comparator has the output phase of the leakage road. Therefore, the error pin should be pulled up by pulling the resistor. Although the error pins may sink the current to 1mA, this current increases the power consumption of the battery. thereforeThe value of the pull -up resistor should be 100k to 1M . Error pins must be connected to the ground if you do not use this function. It should also be noted that when the shutdown pin is low, the error pin is forced to fail due to saving power in the shutdown mode.

Torter operation

Two LDO regulator in LP2966 has an independent shutdown. The CMOS logic level signal (SD) pin when closed will turn off the corresponding regulator. SD1 and SD2 must be actively connected through 100K upper pull -up resistors to work normally. If these sales are the power supply from actively pulling and lowering (such as the CMOS guide for the track comparator), there is no need to pull the resistor. If these are not used, they must be tied to VIN.

Falling voltage

The voltage drop of the regulator is defined as the minimum input and output difference required within this range to measure the output voltage measured by 1V differential measurement. LP2966 uses internal MOSFET, its RDS (on) is 1 For CMOS LDO, the drop voltage is the load current and RDS (on) of the internal MOSFET.

Internal MOSFET in the reverse current path

in the internal MOSFET in LP2966 has an inherent auxiliary diode. When working normally, the input voltage is higher than the output voltage, and the parasitic diode reverse bias. However, if the output is pulled to the input in the application, when the parasite diode is positive bias, the current flows from the output to the input end. As long as the output is limited to 150mA in the parasitic diode. Each output in the maximum output current capacity LP2966 can provide 150 mAh greater than the entire working temperature range. However, the maximum output current ability should be reduced. Under all possible conditions, the knot temperature must be within the scope of the work conditions. LP2966 in MSOP-8 software package. This parcel has a connected temperature coefficient (θJa) connected to the environment of 235 ° C/W, and the minimum copper area. The total power consumption of the device is:

pd (VIN-VOUT1) iOUT1+(VIN-VOUT2) IOUT2 device can achieve the maximum power consumption PDMAX to calculate the following formula PDMAX (TJMAX-TA) In /θja, TJMAX is the prescribed highest knot temperature (125 ° C), and the TA is the ambient temperature. The following figure shows changes in the heating coefficient under different layout schemes.