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1. Describe
The TLV1117CKCT device is a positive low dropout voltage Regulator designed to provide up to 800 mA output current. The device offers 1.5-V, 1.8-V, 2.5-V, 3.3V, 5V and adjustable output voltage options. all Internal circuitry designed for as low as 1V Input to output differential. The dropout voltage is Specified as 1.3 V max at 800 mA, drops at lower load currents.
2. Feature
1. 1.5V, 1.8V, 2.5V, 3.3V, 5V and adjustable output voltage options
2. 800 mA output current
3. Specified dropout voltage at multiple current levels
4. 0.2% line regulation max
5. 0.4% load regulation maximum
3. Application
1. Electronic point of sale
2. Medical, health and fitness applications
3. Printer
4. Appliances and White Goods
5. cable box
4. Pin configuration
5. Pin Description
6. Feature Description
1. NPN Output Drive
NPN output topology provides lower output impedance than most LDOs. However, an output capacitor is required. To support maximum current and lowest temperature, 1.4-V headroom is recommended (less for lower currents) (VI – VO).
2. Programmable Feedback
Op amp with 1.25-V offset input at the ADJUST pin provides easy output voltage programming. For current regulation applications, a single resistor whose resistance value is 1.25 V / IOUT and power rating is greater than (1.25 V)2 / R should be used. For voltage regulation applications, two resistors set the output voltage.
7. Device Functional Modes
1. Operation With Low Input Voltage
The adjustable version of the device requires 1-V headroom (VI – VO) to operate in regulation. With less headroom, the device may drop out and OUTPUT voltage will be INPUT voltage minus drop out voltage.
2. Operation at Light Loads
The device passes its bias current to the OUTPUT pin. The load or feedback must consume this minimum current for regulation or the output may be too high.
3. Operation in Self Protection
When an overload occurs the device will shut down the output stage or reduce the output current to prevent device damage. The device will automatically reset from the overload. The output may be reduced or alternate between on and off until the overload is removed.
8. Typical Application
The adjustable version of the TLV1117CKCT will take a 2.7 to 15-V input. The voltage VREF refers to the voltage between the output and the ADJUST pin, typically 1.25 V. The VREF voltage causes a current to flow across R1, which is the same current that will flow across R2 (minus the negligible 50-µA IADJ). Therefore, R2 can be adjusted to create a larger voltage drop from GND and set the output voltage.
