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TC120303EHA bảng dữ liệu(PDF) 1 Page - Microchip Technology |
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TC120303EHA bảng dữ liệu(HTML) 1 Page - Microchip Technology |
1 / 16 page 2001-2012 Microchip Technology Inc. DS21365C-page 1 TC120 Features • Internal Switching Transistor Supports 600mA Output Current • External Switching Transistor Control for Output Currents of 2A+ • 300kHz Oscillator Frequency Supports Small Inductor Size • Short Circuit Protection • Built-In Undervoltage Lockout • 95% Typical Efficiency • Automatic Switchover to Current-Saving PFM Mode at Low Output Loads • Automatic Output Capacitor Discharge While in Shutdown • Programmable Soft-Start • Power-Saving Shutdown Mode • Small 8-Pin SOP Package Applications • Portable Test Equipment • Local Logic Supplies • Portable Audio Systems • Portable Scanners • Palmtops • Electronic Organizers Device Selection Table Package Type General Description TC120 is a 300kHz PFM/PWM step-down (Buck) DC/ DC regulator/controller combination for use in systems operating from two or more cells, or in line-powered applications. It uses PWM as the primary modulation scheme, but automatically converts to PFM at low output loads for greater efficiency. It requires only an external inductor, Schottky diode, and two capacitors to implement a step-down converter having a maximum output current of 600mA (VIN = 5V, VOUT = 3.3V). An external switching transistor (P-channel MOSFET) can be added to increase output current capability to support output loads of 2A or more. The TC120 consumes only 55 A (max) of supply current (VOUT = 3.3V) and can be placed in shutdown mode by bringing the shutdown input (SHDN) low. During shutdown, the regulator is disabled, supply current is reduced to 2.5 A (max), and V OUT is internally pulled to ground, discharging the output capacitor. Normal operation resumes when SHDN is brought high. Other features include a built-in under- voltage lockout (UVLO), an externally programmable soft start time, and output short circuit protection. The TC120 operates from a maximum input voltage of 10V and is available in a low-profile 8-Pin SOP package. Functional Block Diagram Part Number Output Voltage (V) Package Operating Temp. Range TC120503EHA 5.0 8-Pin SOP -40°C to +85°C TC120333EHA 3.3 8-Pin SOP -40°C to +85°C TC120303EHA 3.0 8-Pin SOP -40°C to +85°C 1 2 3 4 8 7 6 5 TC120 8-Pin SOP EXTW CPC SHDN/SS VIN GND EXT SENSE LX TC120XX03 VIN EXTW CPC SHDN/SS LX EXT GND SENSE CIN D1 L1 VOUT VIN COUT CSS 4.7nF PWM/PFM Step-Down Combination Regulator/Controller |
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Mô tả tương tự - TC120303EHA |
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