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LTC1772B Datasheet(PDF) 1 Page - Linear Technology |
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LTC1772B Datasheet(HTML) 1 Page - Linear Technology |
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1 / 16 page  LTC1772B 1 1772bfa TYPICAL APPLICATION DESCRIPTION Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 The LTC®1772B is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772B when the input voltage falls below 2.0V. The LTC1772B provides a ± 2.5% output voltage accuracy and consumes only 270μA of quiescent current. In shut- down, the device draws a mere 8μA. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor. The LTC1772B is available in a small footprint 6-lead TSOT-23. For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet. Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES APPLICATIONS n Burst Mode® Operation Disabled for Lower Output Ripple at Light Loads n High Efficiency: Up to 94% n High Output Currents Easily Achieved n Wide VIN Range: 2.5V to 9.8V n Constant Frequency 550kHz Operation n Low Dropout: 100% Duty Cycle n Output Voltage Down to 0.8V n Current Mode Operation for Excellent Line and Load Transient Response n Shutdown Mode Draws Only 8µA Supply Current n Tiny 6-Lead TSOT-23 Package n One or Two Lithium-Ion-Powered Applications n Cellular Telephones n Wireless Devices n Portable Computers n Distributed 3.3V, 2.5V or 1.8V Power Systems ITH/RUN LTC1772B 10k R1 0.03Ω 174k 80.6k L1 4.7μH M1 D1 220pF C1: TAIYO YUDEN LMK325BJ106K-T C2A: SANYO 6TPA47M C2B: AVX 0805ZC105KAT1A D1: MOTOROLA MBRM120T3 L1: MURATA LQN6C-4R7 M1: FAIRCHILD FDC638P R1: IRC LRC-LR1206-01-R030F GND VFB 6 5 4 1772 F01a 1 2 3 PGATE VIN SENSE– C1 10μF 10V C2B 1μF 10V VIN 2.5V TO 9.8V VOUT 2.5V 2A C2A 47μF 6V + LOAD CURRENT (mA) 80 85 100 70 75 65 60 90 95 100 1000 10000 10 VIN = 3.6V VOUT = 2.5V LTC1772 Burst Mode OPERATION LTC1772B NON-Burst Mode OPERATION *OUTPUT RIPPLE WAVEFORMS FOR THE CIRCUIT OF FIGURE 1 APPEAR IN FIGURE 2. 1772 F01b Efficiency vs Load Current* |
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