The TPS55340-Q1 device is a monolithic non-synchronous switching converter with an integrated 5-A, 40-V power switch. The device can be configured in several standard switching regulator topologies, including boost, SEPIC, and isolated flyback. The device has a wide input voltage range to support applications with input voltage from 2.9 V to 38 V.
The TPS55340-Q1 device regulates the output voltage with current mode PWM (pulse width modulation) control, and has an internal oscillator. The switching frequency of PWM is set by either an external resistor or by synchronizing to an external clock signal. The user can program the switching frequency from 100 kHz to 2.5 MHz.
The device features a programmable soft-start function to limit inrush current during start-up and has other built-in protection features including cycle-by-cycle overcurrent limit and thermal shutdown.
The TPS55340-Q1 device is available in a small 3-mm × 3-mm 16-pin WQFN package with PowerPad for enhanced thermal performance.
PART NUMBER | PACKAGE(1) | BODY SIZE (NOM) |
---|---|---|
TPS55340-Q1 | WQFN (16) | 3.00 mm × 3.00 mm |
Changes from Revision B (January 2019) to Revision C (September 2021)
PIN | DESCRIPTION | |
---|---|---|
NAME | NO. | |
AGND | 6 | Signal ground of the IC |
COMP | 7 | Output of the transconductance error amplifier. An external RC network connected to this pin compensates the regulator feedback loop. |
EN | 3 | Enable pin. When the voltage of this pin falls below the enable threshold for more than 1 ms, the IC turns off. |
FB | 8 | Error amplifier input and feedback pin for positive voltage regulation. Connect the FB pin to the center tap of a resistor divider to program the output voltage. |
FREQ | 9 | Switching frequency program pin. An external resistor connected between the FREQ pin and the AGND pin sets the switching frequency. |
NC | 10 | This pin is reserved and must be connected to ground. |
14 | ||
PGND | 11 | Power ground of the IC. The PGND pin is connected to the source of the internal power MOSFET switch. |
12 | ||
13 | ||
SS | 4 | Soft-start programming pin. A capacitor between the SS pin and AGND pin programs soft-start timing. |
SW | 1 | SW is the drain of the internal power MOSFET. Connect the SW pin to the switched side of the boost or SEPIC inductor or the flyback transformer. |
15 | ||
16 | ||
SYNC | 5 | Switching frequency synchronization pin. An external clock signal can set the switching frequency between 200 kHz and 1 MHz. If this pin is not used, it must be tied to AGND. |
VIN | 2 | The input supply pin to the IC. Connect the VIN pin to a supply voltage between 2.9 V and 32 V. The voltage on the VIN pin can be different from the boost power stage input. |
PowerPAD | The PowerPAD must be soldered to AGND. If possible, use thermal vias to connect the PowerPAD to PCB ground plane layers for improved power dissipation. |