Refer to the PDF data sheet for device specific package drawings
The LMR33620 SIMPLE SWITCHER® regulator is an easy-to-use, synchronous, step-down DC/DC converter that delivers best-in-class efficiency for rugged industrial applications. The LMR33620 drives up to 2 A of load current from an input of up to 36 V. The LMR33620 provides high light load efficiency and output accuracy in a very small solution size. Features such as a power-good flag and precision enable provide both flexible and easy-to-use solutions for a wide range of applications. The LMR33620 automatically folds back frequency at light load to improve efficiency. Integration eliminates most external components and provides a pinout designed for simple PCB layout. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. The LMR33620 is available in an 8-pin HSOIC package and in a 12-pin 3 mm × 2 mm next generation VQFN package with wettable flanks. This device is also available in an AEC-Q100-qualified version.
PART NUMBER | PACKAGE(1) | BODY SIZE (NOM) |
---|---|---|
LMR33620 | HSOIC (8) | 5.00 mm × 4.00 mm |
LMR33620 | VQFN (12) | 3.00 mm × 2.00 mm |
Changes from Revision D (May 2020) to Revision E (November 2020)
Changes from Revision C (March 2019) to Revision D (May 2020)
Changes from Revision B (June 2018) to Revision C (March 2019)
Changes from Revision A (April 2018) to Revision B (June 2018)
Changes from Revision * (February 2018) to Revision A (April 2018)
DEVICE OPTION | PACKAGE | FREQUENCY | RATED CURRENT | OUTPUT VOLTAGE |
---|---|---|---|---|
LMR33620ADDA | DDA (8-pin HSOIC) 5 × 4 mm |
400 kHz | 2 A | Adjustable |
LMR33620BDDA | 1400 kHz | 2 A | ||
LMR33620CDDA | 2100 kHz | 2 A | ||
LMR33620ARNX | RNX (12-pin VQFN) 3 × 2 × 0.85 mm |
400 kHz | 2 A | Adjustable |
LMR33620BRNX | 1400 kHz | 2 A | ||
LMR33620CRNX | 2100 kHz | 2 A |
PIN | TYPE | DESCRIPTION | ||
---|---|---|---|---|
HSOIC | VQFN | NAME | ||
1 | 1,11 | PGND | G | Power ground terminal. Connect to system ground and AGND. Connect to bypass capacitor with short wide traces. |
2 | 2,10 | VIN | P | Input supply to regulator. Connect a high-quality bypass capacitor or capacitors directly to this pin and PGND. |
3 | 9 | EN | A | Enable input to regulator. High = ON, low = OFF. Can be connected directly to VIN; Do not float. |
4 | 8 | PG | A | Open drain power-good flag output. Connect to suitable voltage supply through a current limiting resistor. High = power OK, low = power bad. Flag pulls low when EN = Low. Can be left open when not used. |
5 | 7 | FB | A | Feedback input to regulator. Connect to tap point of feedback voltage divider. Do not float. Do not ground. |
6 | 5 | VCC | P | Internal 5-V LDO output. Used as supply to internal control circuits. Do not connect to external loads. Can be used as logic supply for power-good flag. Connect a high-quality 1-µF capacitor from this pin to GND. |
7 | 4 | BOOT | P | Boot-strap supply voltage for internal high-side driver. Connect a high-quality 100-nF capacitor from this pin to the SW pin. On the VQFN package connect the SW pin to NC on the PCB. This simplifies the connection from the CBOOT capacitor to the SW pin. |
8 | 12 | SW | P | Regulator switch node. Connect to power inductor. On the VQFN package connect the SW pin to NC on the PCB. This simplifies the connection from the CBOOT capacitor to the SW pin. |
THERMAL PAD |
6 | AGND | G | Analog ground for regulator and system. Ground reference for internal references and logic. All electrical parameters are measured with respect to this pin. Connect to system ground on PCB. For the HSOIC package, the pad on the bottom of the device serves as both the AGND connection and a thermal connection to the heat sink ground plane. This pad must be soldered to a ground plane to achieve good electrical and thermal performance. |
— | 3 | NC | — | On the VQFN package the SW pin must be connected to NC on the PCB. This simplifies the connection from the CBOOT capacitor to the SW pin. This pin has no internal connection to the regulator. |
A = Analog, P = Power, G = Ground |