SNVSBE0G October 2020 – May 2024 LMR43610-Q1 , LMR43620-Q1
PRODUCTION DATA
The LMR436x0-Q1 is the industry smallest 36V, 2A, and 1A synchronous step-down DC/DC converters in a 2mm × 2mm HotRod package. This easy-to-use converter supports a wide input voltage range of 3.0V to 36V with transients up to 42V.
The LMR43620-Q1 is specifically designed to meet low standby power requirements for always on, automotive applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of 1.5µA at 13.5VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances provide exceptional efficiency across the entire load range.
The control architecture and feature set are designed for an ultra-small design size. The device uses peak current mode control to minimize output capacitance. The LMR436x0-Q1 minimizes input filter size by using dual random spread spectrum, a low-EMI HotRod package, and an optimized pinout. The MODE/SYNC and RT pin variants can be used to set or synchronize the frequency between 200kHz and 2.2MHz to avoid noise sensitive frequency bands.
The rich feature set of the LMR436x0-Q1 is designed to simplify implementation for a wide range of automotive end equipments.
PART NUMBER(3) | RATED CURRENT | PACKAGE (1) | PACKAGE SIZE(2) |
---|---|---|---|
LMR43620-Q1 | 2A | RPE (VQFN-HR, 9) | 2.00mm × 2.00mm |
LMR43610-Q1 | 1A |
ORDERABLE PART NUMBER (1) | OUTPUT CURRENT | OUTPUT VOLTAGE | EXTERNAL SYNC | FSW | SPREAD SPECTRUM |
---|---|---|---|---|---|
LMR43620MSC3RPERQ1 | 2A | 3.3V fixed / adjustable | Yes (PFM/FPWM selectable) |
Fixed 2.2MHz |
Yes |
LMR43620MSC5RPERQ1 | 2A | 5V fixed / adjustable | Yes (PFM/FPWM selectable) |
Fixed 2.2MHz |
Yes |
LMR43620MC3RPERQ1 | 2A | 3.3V fixed / adjustable | Yes (PFM/FPWM selectable) |
Fixed 2.2MHz |
No |
LMR43620MC5RPERQ1 | 2A | 5V fixed / adjustable | Yes (PFM/FPWM selectable) |
Fixed 2.2MHz |
No |
LMR43620RS3QRPERQ1 | 2A | 3.3V fixed / adjustable | No (Default PFM at light load) |
Adjustable with RT resistor |
Yes |
LMR43620RS5QRPERQ1 | 2A | 5V fixed / adjustable | No (Default PFM at light load) |
Adjustable with RT resistor |
Yes |
LMR43610MSC3RPERQ1 | 1A | 3.3V fixed / adjustable | Yes (PFM/FPWM selectable) |
Fixed 2.2MHz |
Yes |
LMR43610MSC5RPERQ1 | 1A | 5V fixed / adjustable | Yes (PFM/FPWM selectable) |
Fixed 2.2MHz |
Yes |
LMR43610RS3QRPERQ1 | 1A | 3.3V fixed / adjustable | No (Default PFM at light load) |
Adjustable with RT resistor |
Yes |
LMR43610RS5QRPERQ1 | 1A | 5V fixed / adjustable | No (Default PFM at light load) |
Adjustable with RT resistor |
Yes |
PIN | TYPE | DESCRIPTION | ||
---|---|---|---|---|
NO. | NAME | |||
1 | RT or MODE/SYNC | A | For the RT variant, the switching frequency
can be adjusted from 200kHz to 2.2MHz. For the MODE/SYNC variant, the switching frequency can operate in user-selectable PFM/FPWM mode and can be synchronized to an external clock.Do not float this pin. | |
2 | PGOOD | A | Open-drain power-good flag output. Connect to a suitable voltage supply through a current limiting resistor. High = power OK, low = power bad. This pin goes low when EN = low. This pin can be open or grounded when not used. | |
3 | EN/UVLO | A | Enable input to regulator. High = ON, low = OFF. Can be connected directly to VIN. Do not float this pin. | |
4 | VIN | P | Input supply to regulator. Connect a high-quality bypass capacitor or capacitors directly to this pin and GND. | |
5 | SW | P | Regulator switch node. Connect to power inductor. | |
6 | BOOT | P | Bootstrap supply voltage for internal high-side driver. Connect a high-quality 100nF capacitor from this pin to the SW pin. | |
7 | VCC | P | Internal 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 1µF capacitor from this pin to GND. | |
8 | VOUT/FB | A | Fixed output options and adjustable output options are available with the VOUT/FB pin variant. Connect to the output voltage node for fixed VOUT. Connect to tap point of feedback voltage divider for adjustable VOUT. See Section 8.2.2.2.1 for how to select feedback resistor divider values. Check Section 4 for more details. Do not float this pin. | |
9 | GND | G | Power ground terminal. Connect to system ground. Connect to CIN with short, wide traces. | |
A = Analog, P = Power, G = Ground |