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Overview
| Topology | Buck Converter |
| Input voltage | 3-36 V |
| Switching frequency | 200-2200 kHz |
| Output 1 | 34.2 V / 4 A |
| IC revision | A |
Description
The LM61440 is a high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The LM61440 implements soft recovery from dropout eliminating overshoot on the output.The LM61440 is specifically designed for minimal EMI. The device incorporates adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be set or synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.Electrical characteristics are specified over a junction temperature range of –40°C to +150°C.
Features
- Optimized for ultra low EMI requirements
- Hotrod™ package minimizes switch node ringing
- Parallel input path minimizes parasitic inductance
- Adjustable SW node rise time
- Designed for reliable and rugged applications
- Supports 42-V transients
- ±1% total output regulation accuracy
- VOUT adjustable from 1 V to 95% of VIN
- 0.3-V dropout with 3-A load (typical)
- High efficiency power conversion at all loads
- 7-µA no load current at 13.5 VIN, 3.3 VOUT
- 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
- Low MOSFET ON resistance
- RDS_ON_HS = 41 mΩ (typical)
- RDS_ON_LS = 21 mΩ (typical)
- External bias option for improved efficiency
- Suitable for scalable power supplies
- Pin compatible with:
- LM61440-Q1 (36 V, 4 A, adjustable fSW)
- LM61460 (36 V, 6 A, adjustable fSW)
Typical applications
- USB type-C / Industrial robot: CPU board / Industrial PC: single board computer
- Test and measurement instrumentation
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | Mount | ISAT,10%(A) | RDC(mΩ) | Material | RDC max.(mΩ) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAPI SMT Power Inductor, 1 µH, 10.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance1 µH | Performance Rated Current10.1 A | Saturation Current @ 30%11.5 A | DC Resistance12 mΩ | Self Resonant Frequency55 MHz | Operating Voltage80 V | MountSMT | Saturation Current @ 10%5.3 A | – | – | DC Resistance15 mΩ | ||||
| WE-MAPI SMT Power Inductor, 1.5 µH, 7.45 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance1.5 µH | Performance Rated Current7.45 A | Saturation Current @ 30%9 A | DC Resistance18 mΩ | Self Resonant Frequency40 MHz | Operating Voltage80 V | MountSMT | Saturation Current @ 10%4.2 A | – | – | DC Resistance20.7 mΩ | ||||
 | WE-HCI SMT Flat Wire High Current Inductor, 2.2 µH, 9.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.2 µH | Performance Rated Current9.2 A | Saturation Current @ 30%7.5 A | – | Self Resonant Frequency108 MHz | – | MountSMT | Saturation Current @ 10%3.5 A | DC Resistance11.3 mΩ | MaterialSuperflux | DC Resistance12.43 mΩ | ||||
 | WE-XHMI SMT Power Inductor, 8.2 µH, 6.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | Inductance8.2 µH | Performance Rated Current6.95 A | Saturation Current @ 30%9.3 A | DC Resistance23 mΩ | Self Resonant Frequency19 MHz | Operating Voltage120 V | MountSMT | Saturation Current @ 10%4.6 A | DC Resistance23 mΩ | – | DC Resistance25.3 mΩ |