The TPS7A3501 is a positive voltage, low-noise
(3.8-µVRMS) power filter capable of sourcing a 1-A load suitable for quiet supply solutions. Power filters, such as the TPS7A3501, provide voltage regulation across the input and output terminals with high efficiency (low insertion loss), and power-supply rejection. The device is ideally suited as a noise filter for 3.3-V, 2.5-V, and 1.8-V supplies at up to 1 A.
The input-to-output voltage regulation is also user-programmable, from 200 mV to 500 mV, with a single external resistor. If no resistor is used, the TPS7A3501 provides 330 mV of input-to-output voltage regulation. The device is stable with 10-µF input and output ceramic capacitors and a 10-nF noise-reduction ceramic capacitor.
The TPS7A3501 is fully specified over a wide temperature of –40°C to 125°C. The device is offered in a low thermal resistance, 2-mm × 2-mm, WSON-6 package. Unlike passive filters, the TPS7A3501 provides thermal and current protection for itself and surrounding circuitry.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS7A3501 | WSON (6) | 2.00 mm × 2.00 mm |
Changes from A Revision (October 2013) to B Revision
Changes from * Revision (July 2013) to A Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
EN | 2 | I | Enable pin. Driving EN high turns on the device (if driven low, EN turns off the device). EN must not be left floating and can be connected to IN if not used. |
GND | 3 | — | Ground |
IN | 1 | I | Input supply. A capacitor greater than or equal to 10 µF must be tied from this pin to ground to assure stability. This configuration is especially important when long input traces or high source impedances are encountered. TI recommends using X5R- or X7R-type dielectrics to minimize the temperature variations inherent to capacitors. |
NR | 4 | O | Noise-reduction pin. When a capacitor is connected from this pin to GND, RMS noise can be reduced to very low levels. A capacitor greater than or equal to 10 nF must be tied from this pin to ground to assure stability. TI recommends connecting a 1-µF capacitor from NR to GND (as close to the device as possible) to maximize AC performance and minimize noise. TI recommends using X5R- or X7R-type dielectrics to minimize the temperature variations inherent to capacitors. In addition, when a resistor is connected from this pin to GND or IN, the device input-to-output voltage can be programmed; see Feature Description for details. |
OUT | 6 | O | Regulator output. A capacitor greater than or equal to 10 µF must be tied from this pin to ground to assure stability. TI recommends using a X5R- or X7R-type dielectrics to minimize the temperature variations inherent to capacitors. |
PowerPAD™ | — | — | Connect the PowerPAD to the ground plane for improved thermal performance. |
SENSE | 5 | I | Control-loop error amplifier input. This pin must be connected to OUT. TI recommends connecting SENSE at the point of load to maximize accuracy. |