Model No: LMR38020SDDAR
Texas Instruments LMR38020SDDAR
Manufacturer: Texas Instruments
SEMICON NO.: LMR38020SDDAR
Package: 8-HSOIC
Stock: In stock
Description: Buck Converter DC/DC Positive 2A 40 µA
SEMICON NO.: LMR38020SDDAR
Package: 8-HSOIC
Stock: In stock
Description: Buck Converter DC/DC Positive 2A 40 µA
Quantity :
| Mfr | Texas Instruments |
| Device Type | Synchronous Step-Down (Buck) DC/DC Converter |
| Series / Family | SIMPLE SWITCHER® |
| Input Voltage | 4.2 V to 80 V |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Output Voltage | 1 V to 75 V |
| Output Current (Max) | 2 A (Continuous) |
| Synchronous Rectification | Yes |
| Switching Frequency (fSW) | 200 kHz to 2.2 MHz |
| Quiescent Current (IQ) | 40 µA (Typical) |
| Output Voltage Accuracy | ±1.0% |
| Operating Temperature | -40°C to +150° |
| Package | 8-HSOIC |
| Mounting Type | Surface Mount |
| Compliance | RoHS Compliant |
LMR38020SDDAR synchronous step-down converter
The LMR38020SDDAR is a SIMPLE SWITCHER synchronous step-down (buck) converter designed for rugged industrial and high-voltage applications, delivered in an 8-pin HSOIC (DDA) PowerPAD surface-mount package. The buck converter outputs an adjustable voltage from 1 V to 75 V, draws an ultra-low 40 µA typical quiescent current, tolerates absolute-maximum input transients up to 85 V, and supports a junction temperature range of -40 C to +150 C. What sets the LMR38020SDDAR apart is its combination of high-voltage tolerance, ultra-low quiescent current. The integrated synchronous rectification, internal compensation network, ±1.0% room-temperature voltage reference, and precision enable pin minimize external component count and eliminate the need for a separate supervisor. A configurable RT/SYNC pin sets the switching frequency anywhere from 200 kHz to 2.2 MHz or synchronizes to an external 300 kHz to 2.1 MHz clock, allowing designers to trade efficiency for solution size.
Typical application scenarios for the LMR38020SDDAR center on wide-input power conversion where reliability and low EMI matter more than extreme power density. It is widely deployed in industrial transport, factory automation and control, wireless infrastructure and networking, power-delivery equipment, and Power-over-Ethernet (PoE) powered devices (PDs) where its 80 V rating absorbs TVS-clamped surge events that would destroy lower-voltage buck predecessors such as the LMR16020. The device also serves as the primary switcher in Fly-Buck isolated power supplies for intelligent electric meters, communication power modules, and low-power medical or industrial isolation rails, leveraging its internal compensation and synchronous architecture to simplify what would otherwise be a tricky flyback design.
Alternative step-down converters
1. LMR38020FDDAR: Same 4.2 V to 80 V, 2 A core in the 8-pin HSOIC PowerPAD package but with forced-PWM (FPWM) operation and no spread spectrum, ideal for designs that prioritize tight output ripple over light-load efficiency.
2. LMR38020FSDDAR: Identical 2 A, 80 V buck with both forced-PWM and pseudo-random spread spectrum enabled, the lowest-EMI member of the family for stringent electromagnetic-compliance systems.
3. LMR38010SQDDARQ1: Automotive-grade (AEC-Q) 1-A version of the same 80 V SIMPLE SWITCHER architecture in HSOIC-8, suited to lower-current loads that still require the wide-VIN capability and automotive qualification.
4. LM5012: TI non-synchronous 65 V to 100 V buck converter offered as a next-generation alternative when a higher input-voltage ceiling is needed and a 2-A load is acceptable without integrated low-side FET.
5. LMR33620-Q1: Automotive-grade 3.8 V to 36 V, 2 A synchronous buck that serves as a lower-voltage alternative for 12 V/24 V automotive or industrial rails where the 80 V rating of the LMR38020SDDAR is not required.
The LMR38020SDDAR is a SIMPLE SWITCHER synchronous step-down (buck) converter designed for rugged industrial and high-voltage applications, delivered in an 8-pin HSOIC (DDA) PowerPAD surface-mount package. The buck converter outputs an adjustable voltage from 1 V to 75 V, draws an ultra-low 40 µA typical quiescent current, tolerates absolute-maximum input transients up to 85 V, and supports a junction temperature range of -40 C to +150 C. What sets the LMR38020SDDAR apart is its combination of high-voltage tolerance, ultra-low quiescent current. The integrated synchronous rectification, internal compensation network, ±1.0% room-temperature voltage reference, and precision enable pin minimize external component count and eliminate the need for a separate supervisor. A configurable RT/SYNC pin sets the switching frequency anywhere from 200 kHz to 2.2 MHz or synchronizes to an external 300 kHz to 2.1 MHz clock, allowing designers to trade efficiency for solution size.
Typical application scenarios for the LMR38020SDDAR center on wide-input power conversion where reliability and low EMI matter more than extreme power density. It is widely deployed in industrial transport, factory automation and control, wireless infrastructure and networking, power-delivery equipment, and Power-over-Ethernet (PoE) powered devices (PDs) where its 80 V rating absorbs TVS-clamped surge events that would destroy lower-voltage buck predecessors such as the LMR16020. The device also serves as the primary switcher in Fly-Buck isolated power supplies for intelligent electric meters, communication power modules, and low-power medical or industrial isolation rails, leveraging its internal compensation and synchronous architecture to simplify what would otherwise be a tricky flyback design.
Alternative step-down converters
1. LMR38020FDDAR: Same 4.2 V to 80 V, 2 A core in the 8-pin HSOIC PowerPAD package but with forced-PWM (FPWM) operation and no spread spectrum, ideal for designs that prioritize tight output ripple over light-load efficiency.
2. LMR38020FSDDAR: Identical 2 A, 80 V buck with both forced-PWM and pseudo-random spread spectrum enabled, the lowest-EMI member of the family for stringent electromagnetic-compliance systems.
3. LMR38010SQDDARQ1: Automotive-grade (AEC-Q) 1-A version of the same 80 V SIMPLE SWITCHER architecture in HSOIC-8, suited to lower-current loads that still require the wide-VIN capability and automotive qualification.
4. LM5012: TI non-synchronous 65 V to 100 V buck converter offered as a next-generation alternative when a higher input-voltage ceiling is needed and a 2-A load is acceptable without integrated low-side FET.
5. LMR33620-Q1: Automotive-grade 3.8 V to 36 V, 2 A synchronous buck that serves as a lower-voltage alternative for 12 V/24 V automotive or industrial rails where the 80 V rating of the LMR38020SDDAR is not required.
