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LTC3252 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3252 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC3252 1 3252f The LTC ®3252 is a switched capacitor step-down DC/DC converter that produces two adjustable regulated outputs from a single 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical effi- ciency increase of 50% over that of a linear regulator. No inductors are required. A unique constant frequency, spread spectrum architec- ture provides a very low noise regulated output as well as low noise at the input. The part also has Burst Mode ® operation to provide high efficiency at low output currents, as well as ultralow current shutdown. Low operating currents (60 µA with both outputs enabled, 35 µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-con- strained battery-powered applications. The part is short- circuit and overtemperature protected and is available in a tiny 4mm × 3mm 12-pin DFN package. s Handheld Electronic Devices s Cellular Phones s Low Voltage Logic Supplies s DSP Power Supplies s 3.3V to 1.5V Conversion , LTC and LT are registered trademarks of Linear Technology Corporation. s 2.7V to 5.5V Input Voltage Range s No Inductors s Typical Efficiency 50% Higher than LDOs s Spread Spectrum Operation s Low Input and Output Noise s Shutdown Disconnects Load from VIN s Dual Adjustable Independent Outputs (Range: 0.9V to 1.6V) s Output Current: 250mA Each Output s Low Operating Current: IIN = 60µA Typ (35 µA with One Output Enabled) s Low Shutdown Current: IIN = 0.01µA Typ s Soft-Start Limits Inrush Current at Turn On s Short Circuit and Over Temperature Protected s Available in 4mm × 3mm 12-Pin DFN Package Dual, Low Noise, Inductorless Step-Down DC/DC Converter Burst Mode is a registered trademark of Linear Technology Corporation. 1.5V and 1.2V Output Voltages with Shutdown 470k 5 510k 4.7 µF OUT1 1 FB1 261k 9 510k 4.7 µF LTC3252 3252 TA01 1-CELL Li-ION OR 3-CELL NiMH VOUT = 1.5V IOUT ≤ 250mA VOUT = 1.2V IOUT ≤ 250mA 4.7 µF 1 µF OUT2 12 FB2 2 EN1 3 VIN 10 C2+ 8 C2– 1 µF 4 C1+ 6 C1– 7 GND OFF ON 11 EN2 OFF ON 1.5V/1.2V Efficiency vs Input Voltage VIN (V) 2.7 100 90 80 70 60 50 40 30 20 10 0 3252 TA01a 3.1 3.5 3.9 4.3 4.7 5.1 5.5 IOUT (1.5V) = 100mA IOUT (1.2V) = 100mA LTC3252-1.5V LTC3252-1.2V LDO-1.5V LDO-1.2V DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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