LDCL015M33R STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 17
Technical content
Datasheet sections
- 1 Block diagram
- 2 Pin configuration
- 3 Typical application
- 4 Maximum ratings
- 5 Electrical characteristics
- 6 Typical performance characteristics
- 7 Application information
- 7.1 General operation
- 7.2 Thermal and short-circuit protection
- 7.3 Output voltage setting for ADJ version
- 7.4 Enable pin
- 8 Package mechanical data
- 9 Packaging mechanical data
- 10 Revision history
Features
- No input or output capacitor required
- Input voltage from 1.8 V to 5.5 V
- Very low drop: 50 mV at 100 mA load
- ± 2% output voltage accuracy
- Output voltage tolerance over temperature: ±3 %
- Low noise
- 150 mA guaranteed output current
- Available in fixed and adjustable output voltages, from 0.8 V in 100 mV steps
- Internal current and thermal limit
- Operating temperature range: - 40 °C to 125 °C
- SOT23 5-lead package
Applications
- Space-sensitive applications
- Battery-powered equipment
- Cordless and mobile phones
- Industrial and medical equipment
- Portable equipment
Description
The LDCL015 provides 150 mA of maximum current from an input voltage ranging from 1.8 V to 5.5 V, with a typical dropout voltage of 50 mV. It is stable with no input or output capacitor. Low quiescent current, low noise and capless operation make it suitable for low power battery- powered applications and allows the reduction of board size. Typical power supply rejection ratio is 52 dB at low frequencies, and starts to roll off at 10 kHz. The Enable logic control function puts the LDCL015 in shutdown mode, reducing the total current consumption to less than 1 µA. The device also includes short-circuit constant current limit and thermal protection. Typical applications are mobile phones, personal digital assistants and similar battery-powered systems. SOT23-5L Table 1. Device summary
1 Block diagram
Figure 1. LDCL015 block diagram
2 Pin configuration
Figure 2. Pin connections (top view) Table 2. Pin description
2 GND Ground
3 Typical application
Figure 3. Typical application schematic - adjustable version Figure 4. Typical application schematic - fixed VOUT version Note: 1 R1 and R2 are calculated according to the following formula: R1 = R2 x (V OUT/VADJ-1). 2C IN and COUT are optional.
4 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Absolute maximum ratings Table 4. Thermal data
5 Electrical characteristics
Table 5. Electrical characteristics
10 Hz to 100k Hz; IO = 10 mA VOUT=1V 40 µV RMS
- Minimum V IN = VOUT + VDROP or 1.8 V, whichever is greater.
- Dropout voltage is the input-to-output voltage difference at whic h the output voltage is 100 mV below its nominal value; this
specification does not apply for nominal output voltages below 1.6 V.
- Turn-on time is the time measured between the enable input just exceeding V EN high value and the output voltage just
reaching 95% of its nominal value.
6 Typical performance characteristics
Figure 5. Output voltage vs. temperature Figure 6. Output voltage vs. temperature Figure 7. Output voltage vs. temperature Figure 8. Output voltage vs. temperature Figure 9. Output voltage vs. input voltage (VOUT Figure 10. Output voltage vs. input voltage
7 Application information
7.1 General operation
The main feature of the LDCL015 is its capability to operate with or without input and output capacitors. To achieve this goal, the LDO architecture is based on a robust operational amplifier which has sufficient phase margin over all positions of the output capacitor pole. The LDCL015 can operate with a 100 nF output capacitor, but also without an output capacitor, showing in both configurations good supply voltage rejection, stability and dynamic performance.
7.2 Thermal and short-circuit protection
The LDCL015 is self-protected from short-circuit condition and overtemperature. When the output load is higher than that supported by the device, the output current is increased until the limit of 220 mA (typ) is reached, at which point the current is kept constant even when the load impedance is zero. Thermal protection acts when the junction temperature reaches 170 °C. At this point the IC is completely shut down. As soon as the junction temperature falls back below 150 °C, the device begins operating again. To calculate the maximum power that the device can dissipate while keeping the junction temperature below the T J-OP, the following formula is used: Equation 1 PDMAX = (125-TAMB) / RthJA
7.3 Output voltage setting for ADJ version
In the adjustable version, the output voltage can be set from 0.8 V up to the input voltage, minus the voltage drop across the pass transistor (dropout voltage), by connecting a resistor divider between the ADJ pin and the output, thus allowing remote voltage sensing. The resistor divider should be selected using the following equation: Equation 2 V OUT = VADJ (1 + R1 / R2), with VADJ = 0.8 V (typ.) It is recommended to use resistors with values in the range of 10 kΩ to 50 kΩ. Lower values can also be suitable, but will increase current consumption.
7.4 Enable pin
The LDCL015 features an enable function. When the EN voltage is higher than 2 V, the device is ON; if it is lower than 0.8 V, the device is OFF. In shutdown mode, the current consumption is lower than 1 µA. The EN pin does not have an internal pull-up, which means that it cannot be left floating if it is not used.
8 Package mechanical data
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 21. SOT23-5L mechanical drawing
Figure 22. SOT23-5L footprint (dimensions in mm) Table 6. SOT23-5L mechanical data
9 Packaging mechanical data
Figure 23. SOT23-5L tape and reel drawing
Table 7. SOT23-5L tape and reel mechanical data
Table 8. Document revision history 05-Sep-2011 1 First release. Added part number LDCL015XX to document heading and Table 1. Part numbers LDCL015XX and LDCL015XX33 changed to LDCL015. Added Section 9: Packaging mechanical data.