用户手册 Rev. 0
1 查看全部

概览

优势和特点

  • Input voltage range: 0.6V to 5.5V
  • BIAS voltage range: 2.375V to 5.5V
  • Maximum output current: 3A
  • I2C/PMBus communication
  • Jumper selects bias mode of either external bias voltage or 3.3V internal logic power from the PMBus interface
  • Output voltage is precisely programmed to 1.20V by two 1%m resistors in series
  • BNC connectors for noise and PSRR measurement
  • Component placeholder can connect the PGFB pin directly to BIASAF to keep PG high
  • Operates standalone without PMBus programming
  • Jumper turns regulator on or off
  • Jumper enables or disables the internal clocks of LT3074 for noise performance verification
  • Jumper and resistor combinations select the serial bus interface address
  • Stacking connectors allow PMBus communication to multiple EVAL-LT3074-AZ
  • 6-pin 0.1 inch pitch connector implements Pmod Type 6 I2C
  • LED indication of POWER ON, POWER GOOD and PMBus ALERT
  • Terminals provide output current and output regulation status monitoring
  • The VIOC pin of the LT3074 manages power dissipation and PSRR
  • Banana jacks minimize VIN and VOUT connection voltage drops
  • VO+, VO−, and VI+ terminals for regulation and dropout monitoring
  • Component footprint for an SMA connector that allows a shielded VIN power connection
  • 22-lead (3mm x 4mm) LQFN package

产品详情

The EVAL-LT3074-AZ evaluation board features the LT3074, a 3A, ultralow noise, high power-supply rejection ratio (PSRR), 45mV dropout ultrafast linear regulator with PMBus capability. The input voltage (VIN) range for the VIN power is from 0.6V to 5.5V. The maximum output current is 3A. The output voltage is precisely programmed to 1.20V by two 1% resistors in series. The EVAL-LT3074-AZ requires a BIAS voltage (VBIAS) that is at least 1.2V higher than VOUT and is between 2.375V and 5.5V. There is a jumper (JP4), which gives an option to connect the BIAS pin to either an external bias voltage or the internal 3.3V logic power from the PMBus interface (discussed later in this section). The EVAL-LT3074-AZ can operate standalone without PMBus programming.

The LT3074 of the EVAL-LT3074-AZ requires few external components. Therefore, it simplifies circuit design. The external component choice and careful printed circuit board (PCB) design help optimize noise, PSRR, load transient response, and VOUT regulation performance. The LT3074 requires capacitors for the internal reference, power input, BIASAF pin, BIASDF pin, and the power output. The internal reference is bypassed with a 16V, 0805-sized, 4.7μF capacitor, which is placed at the SETCAP pin, to reduce output noise and program the soft-start. Larger capacitor case sizes and higher voltage ratings decrease 1/f noise for otherwise comparable capacitors. The 22μF capacitor at the circuit output is chosen for high-frequency PSRR performance and to minimize VOUT deviation during load transients.

Please see the User Guide for the full description.

技术与领域

相关产品

使用入门

EQUIPMENT NEEDED

  • DC power supplies
  • Multimeters for voltage and current measurements
  • Electronic or resistive load

文档

  • 查看全部 (3)
  • 演示板原理图 (1)
  • 用户手册 (1)
  • 评估设计文件 (1)
    • Document Type