LMR33630
Synchronous Buck ConverterThe LMR33630 is a synchronous buck converter from Texas Instruments. View the full LMR33630 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official LMR33630 datasheet (PDF) — the source this page was extracted from.
Manufacturer
Texas InstrumentsCategory
Integrated CircuitsLMR33630 Key Specifications
| Parameter | Value |
|---|---|
| Output Current | 3A |
| Switching Frequency | 400kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Package / Case | 8-PowerSOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 8-SO PowerPad |
| Synchronous Rectifier | Yes |
| Topology | Buck |
| Input Voltage (Max) | 36V |
| Input Voltage (Min) | 3.8V |
| Output Voltage (Max) | 24V |
| Output Voltage | 1V |
LMR33630 Overview
Part: LMR33630ADDAR — Texas Instruments
Type: Synchronous Buck Converter
Description: 3.8–36 V input, 3 A synchronous buck converter with 75 mΩ/50 mΩ integrated MOSFETs, 400 kHz switching (A option), peak efficiency >95% and 25 μA operating quiescent current.
Operating Conditions:
- Supply voltage (VIN): 3.8–36 V
- Operating temperature: -40 to 125 °C (junction)
- Output voltage range: 1–24 V (adjustable)
- Output current: 0–3 A
Absolute Maximum Ratings:
- Max supply voltage (VIN to PGND): 38 V
- Max junction temperature: 150 °C
- Storage temperature: -55 to 150 °C
Key Specs:
- Input voltage range: 3.8–36 V
- Output current: 3 A
- Adjustable output voltage: 1–24 V
- Switching frequency: 400 kHz (A option; B = 1.4 MHz, C = 2.1 MHz)
- Minimum on-time: 68 ns
- Power MOSFET RDS(on): 75 mΩ / 50 mΩ
- Peak efficiency: >95%
- Operating quiescent current: as low as 25 μA
Features:
- Functional safety capable
- Peak current mode control
- Integrated compensation network
- Low EMI and switching noise, HotRod™ package with parallel input current paths
- Frequency foldback at light load for high efficiency
- Power-good flag and precision enable
- Thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, hiccup short-circuit protection
- AEC-Q100 qualified versions available
Applications:
- Motor drive systems: drones, AC inverters, variable frequency drives, servo systems
- Factory and building automation: PLC CPU, HVAC control, elevator control
- General wide-input-voltage power supplies
Package:
- DDA 8-pin HSOIC with PowerPAD™ (5.00 mm × 4.00 mm)
- RNX 12-pin VQFN (3.00 mm × 2.00 mm)
LMR33630 Pin Configuration
图 6-1. DDA Package 8-Pin HSOIC With PowerPAD ™ Top View
图 6-2. RNX Package 12-Pin VQFN Top View
表 6-1. Pin Functions
| PIN - HSOIC | PIN - VQFN | PIN - NAME | TYPE | DESCRIPTION |
|---|---|---|---|---|
| 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 C BOOT 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 C BOOT 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 C BOOT capacitor to the SW pin. This pin has no internal connection to the regulator. |
| A = Analog, P = Power, G = Ground | A = Analog, P = Power, G = Ground | A = Analog, P = Power, G = Ground | A = Analog, P = Power, G = Ground | A = Analog, P = Power, G = Ground |
表 6-1. Pin Functions
LMR33630 Electrical Characteristics
Limits apply over the operating junction temperature (T J ) range of -40°C to +125°C, unless otherwise stated. Minimum and maximum limits are specified through test, design or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated, the following conditions apply:
= 4 V.
VIN = 12 V, V EN
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| SUPPLY VOLTAGE | SUPPLY VOLTAGE | SUPPLY VOLTAGE | SUPPLY VOLTAGE | SUPPLY VOLTAGE | SUPPLY VOLTAGE | SUPPLY VOLTAGE |
| V IN | Minimum operating input voltage | 3.8 | V | |||
| I Q | Non-switching input current; measured at VIN pin (2) | V FB = 1.2 V | 24 | 34 | μA | |
| I SD | Shutdown quiescent current; measured at VIN pin | EN = 0 | 5 | 10 | μA | |
| ENABLE | ENABLE | ENABLE | ENABLE | ENABLE | ENABLE | ENABLE |
| V EN-VCC-H | EN input level required to turn on internal LDO | Rising threshold | 1 | V | ||
| V EN-VCC-L | EN input level required to turn off internal LDO | Falling threshold | 0.3 | V | ||
| V EN-H | EN input level required to start switching | Rising threshold | 1.2 | 1.231 | 1.26 | V |
| V EN-HYS | Hysteresis below V EN-H | Hysteresis below V EN-H ; falling | 100 | mV | ||
| I LKG-EN | Enable input leakage current | V EN = 3.3 V | 0.2 | nA | ||
| INTERNAL SUPPLIES | INTERNAL SUPPLIES | INTERNAL SUPPLIES | INTERNAL SUPPLIES | INTERNAL SUPPLIES | INTERNAL SUPPLIES | INTERNAL SUPPLIES |
| VCC | Internal LDO output voltage appearing at the VCC pin | 6 V ≤ V IN ≤ 36 V | 4.75 | 5 | 5.25 | V |
| V BOOT-UVLO | Bootstrap voltage undervoltage lock-out threshold (3) | 2.2 | V | |||
| VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) |
| V FB | Feedback voltage; ADJ option | 0.985 | 1 | 1.015 | V | |
| I FB | Current into FB pin; ADJ option | FB = 1 V | 0.2 | 50 | nA | |
| CURRENT LIMITS (4) | CURRENT LIMITS (4) | CURRENT LIMITS (4) | CURRENT LIMITS (4) | CURRENT LIMITS (4) | CURRENT LIMITS (4) | CURRENT LIMITS (4) |
| I SC | High-side current limit | LMR33630 | 3.85 | 4.5 | 5.05 | A |
| I LIMIT | Low-side current limit | LMR33630 | 2.9 | 3.5 | 4.1 | A |
| I PEAK-MIN | Minimum peak inductor current | LMR33630 | 0.69 | A |
LMR33630 Absolute Maximum Ratings
Over the recommended operating junction temperature range (1)
| PARAMETER | PARAMETER | MIN | MAX | UNIT |
|---|---|---|---|---|
| Voltages | VIN to PGND | - 0.3 | 38 | |
| Voltages | EN to AGND (2) | - 0.3 | V IN + 0.3 | |
| Voltages | FB to AGND | - 0.3 | 5.5 | V |
| Voltages | PG to AGND (2) | 0 | 22 | |
| Voltages | AGND to PGND | - 0.3 | 0.3 | |
| Voltages | SW to PGND | - 0.3 | V IN + 0.3 | V |
| Voltages | SW to PGND less than 100-ns transients | - 3.5 | 38 | V |
| Voltages | BOOT to SW | - 0.3 | 5.5 | V |
| Voltages | VCC to AGND (4) | - 0.3 | 5.5 | V |
| T J | Junction temperature (3) | - 40 | 150 | °C |
| T stg | Storage temperature | - 55 | 150 | °C |
- (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions . Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
- (2) The voltage on this pin must not exceed the voltage on the VIN pin by more than 0.3 V
- (3) Operating at junction temperatures greater than 125°C, although possible, degrades the lifetime of the device.
- (4) Under some operating conditions the VCC LDO voltage may increase beyond 5.5V.
LMR33630 Recommended Operating Conditions
Over the recommended operating temperature range of -40 °C to 125 °C (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Input voltage | VIN to PGND EN (2) | 3.8 0 | 36 V IN | V |
| PG (2) | 0 | 18 | V | |
| Adjustable output voltage | V OUT (3) | 1 | 24 | V |
| Output current | I OUT | 0 | 3 | A |
- (2) The voltage on this pin must not exceed the voltage on the VIN pin by more than 0.3 V.
(3) The maximum output voltage can be extended to 95% of VIN; contact TI for details. Under no conditions should the output voltage be allowed to fall below zero volts.
LMR33630 Thermal Information
The value of R θ JA given in this table is only valid for comparison with other packages and can not be used for design purposes. These values were calculated in accordance with JESD 51-7, and simulated on a 4-layer JEDEC board. They do not represent the performance obtained in an actual application. For design information see Maximum Ambient Temperature section.
| LMR336x0 | LMR336x0 | |||
|---|---|---|---|---|
| THERMAL METRIC (1) | (2) | DDA (HSOIC) 8 PINS | RNX (VQFN) 12 PINS | UNIT |
| R θ JA | Junction-to-ambient thermal resistance | 42.9 (2) | 72.5 (2) | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 54 | 35.9 | °C/W |
| R θ JB | Junction-to-board thermal resistance | 13.6 | 23.3 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 4.3 | 0.8 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 13.8 | 23.5 | °C/W |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | 4.3 | N/A | °C/W |
LMR33630 Typical Application
The LMR33630 step-down DC-to-DC converter is typically used to convert a higher DC voltage to a lower DC voltage with a maximum output current of 3 A. The following design procedure can be used to select components for the LMR33630. Alternately, the WEBENCH Design Tool can be used to generate a complete design. This tool utilizes an iterative design procedure and has access to a comprehensive database of components. This allows the tool to create an optimized design and allows the user to experiment with various options.
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| LMR33630-Q1 | Texas Instruments | — |
| LMR33630ADDA | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
| LMR33630ADDAR | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
| LMR33630ARNX | Texas Instruments | VQFN-12 3x2mm |
| LMR33630ARNXR | Texas Instruments | 12-PowerVFQFN |
| LMR33630ARNXT | Texas Instruments | VQFN-HR-12 3x2mm |
| LMR33630BDDA | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
| LMR33630BDDAR | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
| LMR33630BRNX | Texas Instruments | VQFN-12 3x2mm |
| LMR33630BRNXR | Texas Instruments | 12-PowerVFQFN |
| LMR33630BRNXT | Texas Instruments | 12-PowerVFQFN |
| LMR33630CDDA | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
| LMR33630CDDAR | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
| LMR33630CRNX | Texas Instruments | VQFN-12 3x2mm |
| LMR33630CRNXR | Texas Instruments | 12-PowerVFQFN |
| LMR33630CRNXT | Texas Instruments | VQFN-HR-12 3x2mm |
| LMR33630IS | Texas Instruments | — |
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