LTC3445 - LTC3445是I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN
LTC3445是Linear公司的一款内部开关电源降压产品，LTC3445是I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN，本站介绍了LTC3445的封装应用图解、特点和优点、功能等，并给出了与LTC3445相关的凌力尔特元器件型号供参考。
LTC3445 - I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN
LTC3445 - I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN - Linear Technology（凌力尔特）
功能描述
The LTC3445 contains a high efficiency monolithic synchronous current mode buck regulator, two LDO regulators, a PowerPathTM controller and an I2CTM interface.
The buck regulator has a 6-bit programmable output range of 0.85V to 1.55V. Also, the buck regulator uses either a constant (1.5MHz) or a spread spectrum switching frequency. Using the spread spectrum option allows for a lower noise regulated output as well as low noise at the input. In addition, the regulated output voltage slew rate is programmable via the I2C interface.
The LTC3445 contains two LDO voltage regulators. The regulator output voltages are externally resistor programmable. Each LDO is capable of delivering up to 50mA.
The LTC3445 contains control circuitry (PowerPath) for automatic back-up battery selection. VBACKUP is typically a coin cell.
Typical supply current during operation is only 360µA and drops to 27µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3445 ideal for single Li-Ion battery-powered applications. Automatic Burst Mode operation increases efficiency at light loads, further extending battery life.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, Spread Spectrum patent pending.
特点
Buck Regulator High Efficiency: Up to 93% 600mA Output Current (VCC1 = 3V, VOUT = 1.3V) Programmable Output Voltage: 0.85V to 1.55V 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency or Spread Spectrum Option Soft-Start LDOs Two LDO Regulators: 0.3V Dropout at 50mA PowerPath Controller Dynamically Regulates VCC BATT I2C Standard (100kHz) or Fast Mode (400kHz) 24-Lead (4mm × 4mm) QFN Package应用
Intel’s Microprocessor Supply (PXA27X) Portable Instruments以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
| 器件型号 | 封装 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) |
| LTC3445EUF#PBF | 4x4 QFN-24 | E | $3.50 | $2.45 |
| LTC3445EUF#TRPBF | 4x4 QFN-24 | E | | $2.51 |
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