Linear Technology introduced dual-mode high-efficiency step-up charge pump
The LTC3203-1 automatically bursts Mode operation at light loads to achieve low 120uA supply current. The LTC3203B and LTC3203B-1's patented constant-frequency architecture ensures low input and output ripple in all load conditions to minimize switching noise, making both devices ideal for applications that are sensitive to variable frequency operation . Other features of the LTC3203-1 / B / B-1 include an auto-soft-start circuit to prevent excessive inrush current at start-up, load and input shutdown during shutdown, and short circuit and thermal shutdown protection.
The high switching frequency of the LTC3203-1 / B / B-1 allows the use of tiny external ceramic capacitors, reducing the solution size and cost. The small number of external components (two floating capacitors at VIN and VOUT and two bypass capacitors) and a flat DFN package allow extremely compact solutions for space-constrained applications.
LTC3203EDD-1, LTC3203BEDD and LTC3203BEDD-1 in a flat 10-lead DFN (3mm x 3mm x 0.75mm) package are already shipping. In 1,000-unit quantities, each starting at $ 2.00.
Photo Description: 500mA high efficiency boost pump
Summary of Features: LTC3203 / B / -1
• Optional dual-mode operation for efficiency optimization: 1: 1.5 or 1: 2
• Large output current: up to 500mA
• Low Noise Constant Frequency (1MHz) Operation • No Inductor • Wide Input Voltage Range: 2.7V to 5.5V
• LTC3203B: Adjustable Output Voltage at All Loads and Operates at Constant Frequencies • LTC3203B-1: 4.5V or 5V User Selectable Fixed Output Voltage and Constant Frequencies at All Loads • LTC3203-1 : Automatic Burst Mode Operation, IQ About 120uA and 4.5V or 5V User-Selectable Fixed Output Voltage • Operates at Constant Frequency for All Loads (LTC3203B / LTC3203B-1)
• Soft-start limits inrush current when switched on • Short circuit / thermal protection • Load and input disconnect at shutdown • Shutdown current <1uA
• Flat (3mm x 3mm x 0.75mm) DFN-10 package
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