LP6261 POWER | Alldatasheet
Document overview
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Technical content
Features
5.1V output voltage Up to 95% efficiency Output to Input Disconnect at Shutdown Mode Shut-down current:<0.1uA Over Output Voltage Protection Over Current Protection Over Temperature Protection Internal Compensation of Soft-start 1.2MHz fixed frequency switching Typical Application Circuit VIN SW VOUT GND EN VIN VOUT 10uF 10uF 2.2uH EN NC/FB RUP 53MΩ RDN 20MΩ Marking Information Device Marking Package Shipping LP6261B6F LP6261 YWX SOT23-6 3K/REEL LP6261AB6F LP6261A YWX SOT23-6 3K/REEL Marking indication: Y:Production year W:Production week X: Series Number
LP6261-02 Dec.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 2 of 7 Preliminary Datasheet LP6261 Functional Pin Description Package Type Pin Configurations SOT23-6 VOUT GND EN SW NC/FB VIN SOT23-6 (Top View) Pin Description Pin No. Name Description 1 VOUT Voltage output pin. 2 GND Ground pin. 3 EN Chip enable pin. Logic high voltage enables the device; logic low voltage disables the device. Do not leave it floating. 4 VIN Voltage supply input pin. NC (LP6261) No Connect. FB (LP6261A) Feedback pin. The feedback voltage is 1.36V. 6 SW Pin for switching.
LP6261-02 Dec.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 3 of 7 Preliminary Datasheet LP6261 Absolute Maximum Ratings Note 1 Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Thermal Information ESD Susceptibility
LP6261-02 Dec.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 4 of 7 Preliminary Datasheet LP6261
Electrical Characteristics
(VIN=3.5V, VOUT=5V, CIN=10uF, COUT=22uF, L=2.2uH) Parameter Condition Min Typ Max Units Output Voltage LP6261B6F 5.0 5.1 5.2 V Feedback Voltage LP6261AB6F 1.333 1.36 1.388 V Supply Voltage 1 5 V Input UVLO IOUT=1mA 0.8 V Supply Current VEN=High, VIN=5V, No load 1 uA Supply Current(Shutdown) VEN=0V, VIN=5V 0.05 1 uA Switching Frequency 1200 KHz EN Input Low Voltage 0.3 V EN Input High Voltage 1.4 V EN Input Current VEN=5V 0.1 uA Low-side Current Limit VIN=3.5V 1 A Star-up Current Limit 1 A High-side On Resistance IDS=-100mA 160 mΩ Low-side On Resistance IDS=100mA 220 mΩ Thermal Shutdown 150 ℃ Thermal Shutdown Hysteresis 25 ℃
LP6261-02 Dec.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 5 of 7 Preliminary Datasheet LP6261 Typical Operating Characteristics 80% 82% 84% 86% 88% 90% 92% 94% 96% 98% 100% 0 50 100 150 200 250 300 350 400 450 500 Efficiency（%） Iout（mA) Efficiency VS. Iout VBAT=3V VBAT=3.3V VBAT=3.7V VBAT=4.2V
LP6261-02 Dec.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 6 of 7 Preliminary Datasheet LP6261
Application Information
The LP6261 uses a synchronous 1.2MHz fixed frequency with 1uA ultra-low quiescent current . It is designed for alkaline battery, coin-cell battery, Li-ion or Li -polymer battery powered systems, which requires long battery running time and tiny solution size. The LP6261 uses cycle -by-cycle overcurrent protection. If the inductor peak current reaches the current limit, the chip turns off the main switch to stop the further increase in input current. In this case, the output voltage will decrease until the power balance between the input and output is reached. Short-Circuit Protection Unlike most boost converters, the LP6261 allows output shorts. In the case of a short circuit, the LP6261 first turns off the NMOS when the current detected by the chip reaches the current limit. When VOUT falls below VIN, the device enters a linear mode of operation with the same current limit as the start-up period. In addition, the thermal shutdown circuits disable switching if the die tempe rature rises above 150°C. Setting the Output Voltage Set the output voltage by selecting the resistive voltage divider ratio. The voltage divider drops the output voltage to the 1.36V feedback voltage. Determine the resistor RUP and RDN by the following equation: VOUT = (RUP RDN +1)×VFB Layout Guide For high frequency switching power supplies, the PCB layout is important step in system application design. In order to let IC achieve good regulation, high efficiency and stability, it is strongly recommended the power components(Inductor, input and output capacitor) should be placed as close as possible to chip. The set races should be wide and short.
LP6261-02 Dec.-2019 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 7 of 7 Preliminary Datasheet LP6261 Packaging Information SOT23-6