My Inquiry
My Account
onsemi CS51414GMNR2G
- Part No.:
- CS51414GMNR2G
- Manufacturer:
- onsemi
- Package:
- 18-VFDFN Exposed Pad
- Datasheet:
-
CS51414GMNR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 18DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS51414GMNR2G from onsemi is a 1.5 A, 520 kHz fixed-frequency buck regulator IC with external BIAS supply capability, V2 control architecture, 4.5–40 V input range, and integrated NPN power switch. It delivers fast transient response for point-of-load DC/DC conversion in industrial power supplies and embedded systems requiring high efficiency at light loads.
For engineers reviewing the CS51414GMNR2G datasheet, pinout, applications, or equivalent options, key selection criteria include BIAS pin operation (3.3–6.0 V), 520 kHz switching frequency, thermal shutdown (175–195 °C trip), foldback current limiting (0.9–2.1 A), and SOIC-8 package compatibility with LT1376.
Technical Context
The CS51414GMNR2G implements V2 control architecture-using the output voltage ripple as both DC setpoint and AC control ramp-to achieve ultrafast load transient response independent of error amplifier bandwidth. Its transconductance error amplifier (6.4 mA/V) drives the PWM comparator with simplified compensation (0.1 µF VC-to-GND).
This device operates at 520 kHz nominal frequency with ±14% tolerance, supports frequency foldback to 130 kHz under short-circuit (VFB < 0.29 V), and integrates cycle-by-cycle current limiting with 120–160 ns delay. The BIAS pin powers internal circuitry from an external 3.3–6.0 V rail to reduce quiescent dissipation at high VIN/light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz ±14%; enables compact magnetics and high power density designs. |
| Input Voltage Range | 4.5 V to 40 V; supports wide industrial input rails including 12 V, 24 V, and 36 V systems. |
| Output Current | 1.5 A continuous; limited by on-chip NPN transistor with 0.4–1.0 V saturation voltage at 1.5 A. |
| BIAS Supply Range | 3.3 V to 6.0 V; reduces IC power loss when VIN > 12 V and load < 200 mA. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction and current limit foldback for short-circuit protection. |
| Thermal Shutdown | 175–195 °C trip point with 42 °C hysteresis; prevents permanent damage during sustained overload. |
| Shutdown Quiescent Current | 20 µA typical; enables ultra-low-power sleep mode via active-low SHDNB pin. |
Pinout & Package
CS51414GMNR2G is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST; pins 2–4 are VIN; pin 5 is BIAS; pin 6 is SHDNB; pin 7 is GND; pin 8 is VFB; VC and VSW are not brought out in SOIC-8 - only available in DFN-18 variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive node | Provides elevated base drive to NPN switch; connects to external capacitor-diode network to minimize saturation voltage and improve efficiency. |
| 2–4 (VIN) | Main power input | Supplies power to internal bias rails and collector of on-chip NPN switch; accepts 4.5–40 V DC. |
| 5 (BIAS) | Secondary bias supply | Accepts 3.3–6.0 V external supply to power control circuitry, reducing VIN-derived losses at high input voltage. |
| 6 (SHDNB) | Active-low enable | TTL-compatible shutdown input; pulls low (<1.0 V) to enter sleep mode (≤85 µA IQ); internal pull-up defaults to enabled state. |
| 7 (GND) | Power return | Common reference for all internal circuits and external feedback network; must be low-impedance connection to PCB ground plane. |
| 8 (VFB) | Error amplifier inverting input | Monitors output voltage via resistor divider; initiates foldback protection when voltage drops below 0.29 V. |
Key Features
| Feature | Design Value |
|---|---|
| V2 control architecture | Delivers sub-µs load transient response without complex loop compensation; eliminates need for high-bandwidth error amplifier. |
| BIAS pin operation | Enables >30% reduction in IC power dissipation at VIN = 24 V and IOUT < 200 mA versus VIN-only biasing. |
| Frequency foldback | Reduces switching frequency to 130 kHz during overcurrent, cutting short-circuit power dissipation by ~75%. |
| Integrated thermal shutdown | Auto-recovers after cooldown; hysteresis prevents oscillation near trip point in thermally constrained enclosures. |
| Soft-start via VC pin | Uses internal error amplifier source current to charge external 0.1 µF capacitor; achieves ~5 ms controlled output ramp without extra components. |
Applications
| Industrial Motor Drives | Programmable Logic Controllers (PLCs) |
|---|---|
Use Scenario: Powering FPGA I/O banks and microcontroller cores from 24 V DC bus in servo drive modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V/1.5 A with fast transient response to handle burst logic currents. Use Value: V2 control ensures <10 µs recovery from 1 A load step; BIAS pin improves efficiency by 18% at 24 V input and 50 mA load. | Use Scenario: Generating 5.0 V rail for analog sensor interfaces and communication peripherals in modular PLC backplanes. IC Role / Device Role / Timing Role: Fixed-frequency buck converter with foldback protection against field-wiring faults and shorted sensor outputs. Use Value: 0.29 V VFB threshold triggers immediate frequency/current foldback, limiting fault energy to safe levels during 24 V bus shorts. |
| Telecom Remote Radio Units (RRUs) | Test & Measurement Equipment |
Use Scenario: Point-of-load regulation for RF power amplifier bias supplies in outdoor 4G/5G base stations. IC Role / Device Role / Timing Role: High-efficiency buck stage converting -48 V derived 12 V intermediate rail to 6.0 V for GaN driver stages. Use Value: BIAS pin allows use of local 5.0 V LDO output to power CS51414GMNR2G, eliminating VIN-related dropout and improving PSRR by 40 dB. | Use Scenario: Supplying stable 3.3 V to high-speed ADCs and DACs in portable oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Low-noise, tightly regulated buck regulator with soft-start to prevent digital supply rail overshoot during power-on reset. Use Value: Internal soft-start (5 ms ramp) eliminates need for external timing components; 2.0% reference tolerance ensures ±33 mV output accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376CS8#PBF | Pin-compatible, 500 kHz, 1.5 A; no BIAS pin; requires external sync for multi-phase operation. | Lacks BIAS functionality-less efficient at high VIN/light load; higher quiescent current (100 µA vs 6.25 mA active). | Select when legacy LT1376 footprint reuse is required and BIAS efficiency gain is non-critical. |
| MP2315GJ-Z | 500 kHz, 2 A, 4.5–36 V; integrated MOSFETs; no BIAS pin; different pinout and compensation scheme. | Higher current rating but lacks V2 architecture-slower transient response (>50 µs); requires full loop redesign. | Select for higher output current needs where board space permits new layout and compensation tuning. |
Compared with LT1376CS8#PBF, CS51414GMNR2G adds BIAS-driven efficiency gains and tighter VFB foldback control; compared with MP2315GJ-Z, it offers superior transient performance and drop-in replacement for LT1376-based designs-but with lower max current and no integrated high-side FET.
Availability
CS51414GMNR2G is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers (PLCs), telecom remote radio units (RRUs), and test & measurement equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS51414GMNR2G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CS5141X product line was designed specifically for high-efficiency, high-transient-response DC/DC buck conversion in space-constrained industrial and telecom systems-emphasizing simplicity, robustness, and thermal resilience.
FAQ
What is the function of the BIAS pin on the CS51414GMNR2G?
The BIAS pin on the CS51414GMNR2G accepts an external 3.3–6.0 V supply to power internal control circuitry, reducing power dissipation when VIN exceeds 12 V. This feature improves efficiency by up to 30% at light loads and high input voltages. In CS51414GMNR2G designs, connecting BIAS to a local 5.0 V rail lowers total IC power loss versus VIN-only biasing, especially critical in thermally constrained enclosures.
Does the CS51414GMNR2G support synchronization with an external clock?
No, the CS51414GMNR2G does not support external synchronization. It belongs to the "Bias" variant group (CS51412/CS51414), which replaces the SYNC pin with BIAS functionality. Only CS51411 and CS51413 variants include SYNC capability. Attempting to drive a clock signal into the BIAS pin of CS51414GMNR2G may damage the IC or cause undefined behavior.
What is the maximum allowable voltage on the BOOST pin of the CS51414GMNR2G?
The maximum allowable voltage on the BOOST pin of the CS51414GMNR2G is 40 V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage-even momentarily-may cause permanent damage. During normal bootstrapped operation, BOOST voltage equals VIN + VO − VF (diode forward drop), so design must ensure VIN + VO ≤ 40 V + VF. A 1N4148 diode (VF ≈ 0.7 V) limits BOOST to safe levels for VIN ≤ 36 V and VO ≤ 5 V.
How does the CS51414GMNR2G implement short-circuit protection?
The CS51414GMNR2G implements short-circuit protection via dual-stage foldback: when VFB falls below 0.29 V, it reduces switching frequency to 130 kHz (25% of nominal) and lowers current limit from 1.6–3.0 A to 0.9–2.1 A. This cuts power dissipation in the IC and external components by ~75%. The feature is fully automatic, requires no external components, and recovers once VFB rises above 0.32 V. This behavior is confirmed in the Electrical Characteristics table and Short Circuit section of the CS51414GMNR2G datasheet.
Is the CS51414GMNR2G pin-compatible with the LT1376?
Yes, the CS51414GMNR2G is functionally pin-compatible with the LT1376 in SOIC-8 packages, as explicitly stated in the datasheet: "CS51412 and CS51414 are functionally pin-compatible with the LT1376." Pin mapping matches for BOOST, VIN, BIAS (replaces LT1376's SYNC), SHDNB, GND, VFB, and unused pins. However, note that CS51414GMNR2G uses V2 control (vs. current-mode in LT1376), requiring minor compensation adjustments for optimal stability.
CS51414GMNR2G 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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-DFN (5x6)
CS51414GMNR2G FAQ
1.How can I place an order for CS51414GMNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414GMNR2G 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 CS51414GMNR2G reliable?
The price and inventory of CS51414GMNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414GMNR2G is usually 5 days.
3.What payment methods are accepted for CS51414GMNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414GMNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414GMNR2G?
CS51414GMNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414GMNR2G 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 CS51414GMNR2G?
For technical support, including CS51414GMNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414GMNR2G requirements.
6.How does Aetrix verify that CS51414GMNR2G is sourced from the original manufacturer or authorized distributors?
All CS51414GMNR2G 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 CS51414GMNR2G meets industry standards.
7.What is the process for return or replacement of CS51414GMNR2G?
All CS51414GMNR2G units undergo pre-shipment inspection (PSI). If there is an issue with CS51414GMNR2G, 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 CS51414GMNR2G part is unused and in its original packaging.
Return procedure for CS51414GMNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS51414GMNR2G Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
