TPS7A9001DSKT

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1. Describe

The TPS7A9001DSKT is a low noise (4.7 µVRMS), low dropout (LDO) regulator capable of delivering 500 mA with only 100 mV of maximum dropout to 5 V and 200 mV to 5.7 V. The TPS7A9001DSKT output can be adjusted from 0.8 V to 5.7 V with an external adjustment resistor. The TPS7A90 wide input voltage range supports as low as 1.4 V and as high as 6.5 V. With 1% output voltage accuracy (at line, load, and temperature) and soft-start capability to reduce inrush current, the TPS7A90 is ideal for supply-sensitive analog low-voltage devices [such as voltage-controlled oscillators (VCOs), analog-to-digital converters ( ADC) and digital-to-analog converters. The TPS7A90 is designed to power noise-sensitive power supplies such as those found in high-speed component communications, video, medical or test and measurement applications. Very low 4.7µVRMS output noise and wideband PSRR (30 dB at 1 MHz) minimize phase noise and clock jitter. These functions maximize the performance of clocking devices, ADCs and DACs.

2. Feature

    1. 1.0% line, load and temperature accuracy

    2. Low output noise: 4.7 µVRMS (10 Hz–100 kHz)

    3. Low dropout: 100 mV (max) at 0.5 A

    4. Wide input voltage range: 1.4 V to 6.5 V

    5. Wide output voltage range: 0.8 V to 5.7 V

    6. High Power Supply Rejection Ratio (PSRR):

        – 60 dB at DC

        – 50 dB at 100 kHz

        – 30 dB at 1 MHz

    7. Fast transient response

    8. Adjustable start-up inrush control with selectable soft-start charge current

    9. Open-drain power good (PG) output

  10. RθJC = 3.2ºC/W

  11. 2.5mm × 2.5mm, 10-pin WSON package

3. Application

    1. Macro Remote Radio Unit (RRU)

    2. Outdoor backhaul unit

    3. Active Antenna System mMIMO (AAS)

    4. Ultrasound scanner

    5. Laboratory and field instruments

    6. Sensors, Imaging and Radar

4. Pin configuration

5. Pin Description

6. Output enable

The enable pin (EN) of the TPS7A9001DSKT is active high. The output voltage is enabled when the enable pin voltage is greater than VIH(EN) and disabled when the enable pin voltage is less than VIL(EN). If the output voltage is not required for independent control, then connect the enable pin to the input. The TPS7A90 has an internal pull-down MOSFET to actively release the output voltage when the device is disabled.

7. Output Voltage Accuracy

Output Voltage Accuracy specifies the minimum and maximum output voltage error relative to the expected nominal value The output voltage is expressed as a percentage. The TPS7A90 has 1% output voltage accuracy, including errors introduced by internal reference, load regulation, and line regulation differences over the full range Rated load and line operating conditions over temperature, as specified in the Electrical Characteristics table. The output voltage accuracy also takes into account any variation between manufacturing batches.

8. High power supply rejection ratio

PSRR measures how well the LDO control loop rejects noise from the input source so that the DC output voltage is as noise-free as possible across the entire spectrum (usually measured from 10 Hz to 10 MHz). Although PSRR is the loss of noise signal amplitude, the PSRR curves in the Typical Characteristics section are presented as positive values, in decibels (dB), for convenience. Equation 2 gives the PSRR calculation as a function of frequency, where the input noise voltage [VIN(f)] and output noise voltage [VOUT(f)] are the amplitudes of their respective sinusoidal signals.