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KB3511 数据表(PDF) 1 Page - Kingbor Technology Co |
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KB3511 数据表(HTML) 1 Page - Kingbor Technology Co |
1 / 14 page 1 ■ Up to 97% Efficiency ■ 25uA No Load Current Per Channel ■ 800mA Output Current ■ 2.5V to 6.5V Input Voltage Range ■ 2.2MHz Constant Frequency Operation ■ No Schottky Diode Required ■ Low Dropout Operation: 100% Duty Cycle ■ 0.6V Reference Allows Low Output Voltages ■ Shutdown Mode Draws 1 µA Supply Current ■ Current Mode Operation for Excellent Line and Load Transient Response ■ Overtemperature Protected ■ DFN33-10 Package The KB3511 is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.8V and 3.3V. Supply current during operation is only 25 µA and drops to 1µA in shutdown. The 2.5V to 6.5V input voltage range makes the KB3511 ideally suited for single Li-Ion battery-pow- ered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Trickle Mode operation increases efficiency at light loads, further extending battery life. Switching frequency is internally set at 2.2MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feed- back reference voltage. The KB3511 is available in a low profile (0.8mm) DFN33-10 package. ■ Cellular Telephones ■ Personal Information Appliances ■ Wireless and DSL Modems ■ Digital Still Cameras ■ MP3 Players ■ Portable Instruments KB3511 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 APPLICATIONS FEATURES DESCRIPTION TYPICAL APPLICATION KB3511 Efficiency Curve Figure 1. 3.3V/1.8V at 800mA Step-Down Regulators LOAD CURRENT (mA) 1 100 95 90 85 80 75 70 65 60 10 100 1000 3.3V 1.8V VIN=3.6V 1.3mm Height Core Supply Dual 800mA, 2.2MHz Step-Down DC/DC Converter High Efficiency, Low Noise, Fast Transient System-Power RUN1 VIN VIN = 3.6V TO 6.0V VOUT2 = 3.3V AT 800mA VOUT1 = 1.8V AT 800mA RUN2 POR SW2 VFB2 GND VFB1 SW1 MODE/SYNC C1 R5 100k RESET C4, 22pF C5, 22pF L1 2.2 µH L2 2.2 µH R4 680k R2 300k R1 150k R3 150k C3 4.7 µF C2 4.7 µF C1, C2, C3: 4.7uF 6.3V 0603 L1, L2: EVERCOM SD11-2R2 (3x3x1.2mm) 10 11 9 6 7 8 4 5 3 2 1 KB3511A DFN3x3mm RESET 4.7 µF 10 µ F 1 R1 * * * Vin>4.5V Used C6 |
类似零件编号 - KB3511 |
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类似说明 - KB3511 |
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