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onsemi CS51411EMNR2G
- Part No.:
- CS51411EMNR2G
- Manufacturer:
- onsemi
- Package:
- 18-VFDFN Exposed Pad
- Datasheet:
-
CS51411EMNR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 18DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,654
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Product details
Overview
CS51411EMNR2G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with V² control architecture, external BOOST capacitor support, SYNC input, and thermal shutdown protection. It operates from 4.5 V to 40 V input, delivers regulated output via integrated NPN switch, and targets industrial power supplies and embedded DC-DC conversion where fast transient response and simplified compensation are required.
For engineers reviewing the CS51411EMNR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its 260 kHz switching frequency, SYNC capability for noise-sensitive multi-rail systems, BOOST-driven NPN saturation voltage ≤0.7 V at 1.5 A, 0.29 V frequency foldback threshold, and functional pin-compatibility with LT1375 in SOIC-8 and DFN-18 packages.
Technical Context
The CS51411EMNR2G implements V² control architecture-using the converter's output voltage ripple as both DC setpoint and AC control ramp-enabling ultrafast load transient response independent of error amplifier bandwidth and eliminating need for complex loop compensation. Its internal transconductance error amplifier (6.4 mA/V) drives the VC pin with 1.270 V reference and 500 kHz unity-gain bandwidth.
This device integrates a 1.5 A NPN power switch biased via BOOST pin, supports synchronization up to 470 kHz, and features cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz under short circuit), and soft-start via VC pin capacitor charging. It lacks BIAS pin functionality-exclusive to CS51412/CS51414 variants-and is rated for −40 °C to 85 °C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz ±13% - enables compact magnetics and EMI filtering; stable across line/load per V² architecture |
| Output Current Capability | 1.5 A continuous - delivered by on-chip NPN transistor with BOOST-assisted saturation |
| Input Voltage Range | 4.5 V to 40 V - supports wide industrial and automotive battery-fed inputs |
| Frequency Foldback Threshold | 0.29 V on VFB pin - triggers 4:1 frequency reduction and current limit foldback during overload/short circuit |
| Reference Voltage Accuracy | ±2.0% (1.244–1.296 V) - ensures tight output regulation without external trimming |
| Shutdown Quiescent Current | 85 µA max - enables low-power sleep mode with active-low SHDNB control |
| Thermal Shutdown Trip Point | 175–195 °C - protects die under sustained overloads; 42 °C hysteresis prevents oscillation |
Pinout & Package
CS51411EMNR2G is housed in an exposed-pad 18-lead DFN package (Case 505, MN suffix), thermally optimized for high-current DC-DC applications. Pin 1 is marked with a dot; pin 9 is NC and not bonded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive supply | Provides elevated base drive to NPN switch; connects to external capacitor-diode network to minimize VCE(sat) and on-chip dissipation |
| 2–4 (VIN) | Main power input | Supplies collector of internal NPN switch and bias circuitry; accepts 4.5–40 V; multiple pins reduce trace resistance |
| 5–7 (VSW) | Switch emitter node | Connects to inductor; swings negative to −1.0 V (50 ns); requires catch diode and short, low-inductance layout |
| 8 (SHDNB) | Active-low shutdown | TTL-compatible input; pulls below 1.0 V to enter <85 µA sleep mode; internal pull-up enables default-on operation |
| 10 (SYNC) | External clock input | Accepts 305–470 kHz TTL sync signal; overrides internal oscillator; disables foldback during sync mode |
| 13 (GND) | Power ground | Primary return path for switch current and bias circuits; tied to exposed thermal pad for heatsinking |
| 16 (VFB) | Feedback input | Inverting input of error amp; 0.29 V threshold triggers protection; sets output voltage via resistor divider |
| 17 (VC) | Error amplifier output | Open-collector node for loop compensation; 0.1 µF to GND provides soft-start and stability |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers sub-µs load transient response without requiring high-bandwidth error amplifier or complex RC compensation |
| BOOST pin bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss and enabling >90% efficiency at mid-load |
| SYNC input (305–470 kHz) | Enables synchronized multi-phase operation or EMI peak shifting-critical for noise-sensitive instrumentation and comms systems |
| Frequency & current foldback | Under short-circuit, reduces switching frequency to 65 kHz and limits peak current to ~1.5 A, limiting junction temperature rise |
| Soft-start via VC pin | Uses internal error amp source current (25 µA typ.) and external capacitor to ramp output voltage smoothly-no extra components needed |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Generating stable 3.3 V or 5 V rails from 12 V or 24 V vehicle batteries in body control units with strict EMI limits. IC Role / Device Role / Timing Role: Primary buck controller regulating microcontroller I/O and sensor interface supplies; SYNC input aligns switching to system clock to avoid beat frequencies. Use Value: V² control maintains regulation during cranking (6–16 V input dips); BOOST minimizes dropout at cold start; thermal shutdown prevents latch-up during under-hood overheating. |
Use Scenario: Powering CAN transceivers and EEPROMs in distributed automotive ECUs where board space and thermal management are constrained. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down regulator replacing discrete solutions; DFN-18 package enables dense layout near load points. Use Value: 1.5 A output supports burst-mode CAN traffic; 85 µA shutdown current extends battery life in sleep mode; 40 V abs max rating handles load-dump transients. |
| Factory Automation Sensors | Point-of-Sale Terminal Power |
Use Scenario: Converting 24 V factory bus to 5 V for analog sensor front-ends and ADC references in noisy industrial environments. IC Role / Device Role / Timing Role: Regulator with inherent ripple rejection (40 dB PSRR on reference) and fast transient recovery to maintain ADC accuracy during motor switching events. Use Value: V² architecture rejects line noise without additional LC filters; frequency foldback prevents thermal runaway during sensor cable shorts. |
Use Scenario: Providing clean 3.3 V for ARM-based payment terminals powered from universal AC adapters (12–19 V DC input). IC Role / Device Role / Timing Role: Main DC-DC converter with soft-start and shutdown control for user-initiated power cycling. Use Value: 260 kHz switching allows small 4.7 µH inductors; SYNC capability enables coordinated power sequencing with display backlight drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1375CS8#PBF | Pin-compatible SOIC-8; 1.5 A, 250 kHz; no SYNC; higher quiescent current (6 mA vs. 6.25 mA typical) | Lacks SYNC and BOOST optimization; less suitable for noise-critical or high-efficiency light-load designs | Select when legacy SOIC-8 footprint is mandatory and SYNC/foldback are not required |
| MP2307DN-LF-Z | 1.2 A, 340 kHz; MOSFET-based; no BOOST/SYNC; different pinout; RoHS-compliant but non-Pb-free | Lower current rating and no foldback protection; requires external bootstrap diode; not functionally pin-compatible | Choose for cost-sensitive consumer applications where 1.2 A suffices and thermal robustness is secondary |
Compared with LT1375CS8#PBF, CS51411EMNR2G adds SYNC and BOOST for better EMI control and efficiency; versus MP2307DN-LF-Z, it offers higher current, integrated NPN with proven foldback, and Pb-free DFN packaging-making it preferable for industrial reliability and thermal safety.
Availability
CS51411EMNR2G is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body electronics, and point-of-sale terminal designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51411EMNR2G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5141X product line was designed specifically for high-reliability, wide-input-voltage DC-DC conversion in harsh environments-emphasizing robust protection (foldback, thermal shutdown), simplified design (V² control), and compatibility with legacy footprints like LT1375.
FAQ
What is the maximum input voltage rating for CS51411EMNR2G?
The CS51411EMNR2G has an absolute maximum VIN rating of 40 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V risks permanent damage to the internal NPN switch and bias circuitry. The device includes built-in protection against input transients up to this limit, but external clamping is advised for automotive load-dump scenarios exceeding 40 V.
Does CS51411EMNR2G support external synchronization, and what is its sync frequency range?
Yes, CS51411EMNR2G supports external synchronization via its SYNC pin (Pin 10). The valid sync frequency range is 305 kHz to 470 kHz, compatible with TTL-level signals. During sync operation, the internal oscillator is disabled, frequency foldback is suppressed, and switching is locked to the external clock edge-enabling precise EMI management in multi-rail systems.
How does the BOOST pin improve efficiency in CS51411EMNR2G?
The BOOST pin in CS51411EMNR2G supplies elevated base drive to the internal NPN transistor, reducing saturation voltage (VCE(sat)) to ≤0.7 V at 1.5 A. This directly lowers conduction losses-especially critical at high input voltages and light loads-improving full-load efficiency by up to 3% compared to non-boosted operation. A 0.1 µF ceramic capacitor and 1N4148 diode form the standard boost network.
What protection features are integrated into CS51411EMNR2G?
CS51411EMNR2G integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz), and short-circuit current foldback (to ~1.5 A). It also features soft-start via VC pin and under-voltage lockout (startup threshold 2.2–4.4 V). These protections operate autonomously without external components, ensuring robust operation during faults.
Is CS51411EMNR2G pin-compatible with LT1375, and which packages match?
Yes, CS51411EMNR2G is functionally pin-compatible with LT1375 in both SOIC-8 (D suffix) and 18-lead DFN (MN suffix) packages. Pin mapping for VIN, VSW, GND, VFB, VC, SHDNB, BOOST, and SYNC matches LT1375's SOIC-8 layout when using the DFN variant's designated pin groups-enabling drop-in replacement in existing designs with verified layout adaptation.
CS51411EMNR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 18-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.27V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-DFN (5x6)
CS51411EMNR2G FAQ
1.How can I place an order for CS51411EMNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51411EMNR2G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CS51411EMNR2G reliable?
The price and inventory of CS51411EMNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51411EMNR2G is usually 5 days.
3.What payment methods are accepted for CS51411EMNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51411EMNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51411EMNR2G?
CS51411EMNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51411EMNR2G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CS51411EMNR2G?
For technical support, including CS51411EMNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51411EMNR2G requirements.
6.How does Aetrix verify that CS51411EMNR2G is sourced from the original manufacturer or authorized distributors?
All CS51411EMNR2G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CS51411EMNR2G meets industry standards.
7.What is the process for return or replacement of CS51411EMNR2G?
All CS51411EMNR2G units undergo pre-shipment inspection (PSI). If there is an issue with CS51411EMNR2G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CS51411EMNR2G part is unused and in its original packaging.
Return procedure for CS51411EMNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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