My Inquiry
My Account
onsemi CS51414GD8G
- Part No.:
- CS51414GD8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51414GD8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,784
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS51414GD8G from onsemi is a 1.5 A, 520 kHz fixed-frequency buck regulator IC with external bias capability, operating from 4.5 V to 40 V input and delivering tightly regulated output via V2 control architecture. It integrates an on-chip NPN power switch, thermal shutdown, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection-designed for high-efficiency DC-DC conversion in industrial power supplies.
For engineers reviewing the CS51414GD8G datasheet, pinout, applications, or equivalent options, key selection criteria include its 520 kHz switching frequency, BIAS pin support for efficiency optimization at high VIN/low load, BOOST pin bootstrapping, SOIC-8 package compatibility, and functional equivalence to LT1376 in bias-enabled configurations.
Technical Context
The CS51414GD8G implements V2 control architecture, using the output voltage ripple as both DC setpoint and AC control ramp-enabling ultrafast transient response independent of error amplifier bandwidth. Its transconductance error amplifier (6.4 mA/V) drives the VC pin with 500 kHz unity-gain bandwidth and 70 dB open-loop gain, simplifying compensation with only a 0.1 µF capacitor to ground.
It features dual protection modes: when VFB falls below 0.29 V, it triggers frequency foldback (reducing switching frequency to 130 kHz) and current limit foldback (to ~1.5 A), while the BIAS pin (3.3–6.0 V) powers internal circuitry separately from VIN to reduce quiescent dissipation-critical for high-input-voltage, light-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz ±14% - enables compact magnetics and low-output-ripple designs without external timing components. |
| Output Current | 1.5 A continuous - delivered by integrated NPN transistor with 0.7 V typical saturation voltage at 1.5 A, minimizing conduction loss. |
| Input Voltage Range | 4.5 V to 40 V - supports wide industrial input rails including 12 V, 24 V, and 36 V systems. |
| BIAS Pin Voltage | 3.3 V to 6.0 V - allows external low-voltage supply to power control circuitry, reducing IC power dissipation by up to 40% at high VIN/light load. |
| VFB Threshold | 0.32 V ±0.03 V - sets output regulation point; used with external resistor divider to configure output voltage (e.g., 3.3 V, 5.0 V, 12 V). |
| Shutdown Quiescent Current | 20 µA typical - achieved via active-low SHDNB pin; reduces system standby power in battery-backed or energy-sensitive applications. |
| Thermal Shutdown | 185 °C trip point with 42 °C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
Pinout & Package
CS51414GD8G is housed in an SOIC-8 (Case 751) package with standard 1.27 mm pitch, RoHS-compliant Pb-free finish, and rated for 0 °C to 70 °C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive supply | Provides elevated base drive to NPN switch; connected to external capacitor-diode network to minimize saturation voltage and improve efficiency. |
| 2,3,4: VIN | Main power input | Supplies power to internal LDO and switch collector; accepts 4.5–40 V; multiple pins reduce trace resistance and thermal stress. |
| 5: VSW | Switch emitter node | Connects to inductor; swings negative during off-time (−1.0 V, <50 ns); requires catch diode and short PCB routing to minimize EMI. |
| 6: BIAS | External bias rail input | Accepts 3.3–6.0 V to power internal logic and error amplifier-bypasses VIN LDO, cutting quiescent loss in high-VIN applications. |
| 7: GND | Power return | Common reference for all internal circuits; must be low-impedance connection to minimize noise coupling into VFB and VC. |
| 8: VFB | Feedback input | Inverting input of error amplifier; senses output via resistor divider; triggers foldback protection if voltage drops below 0.29 V. |
| NC (pins 9–18) | No connection | Not bonded in SOIC-8 variant; omitted from layout-no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| V2 control architecture | Delivers sub-10 µs load transient response without requiring high-bandwidth error amplifier or complex compensation. |
| BOOST pin bootstrapping | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, lowering on-resistance losses and enabling >90% efficiency at 12 V→5 V conversion. |
| BIAS pin operation | Enables direct powering of control circuitry from regulated 3.3 V or 5 V rail-cutting VIN-derived quiescent dissipation by >50% at VIN = 36 V. |
| Frequency & current foldback | Automatically scales switching frequency to 130 kHz and limits peak current to ~1.5 A under short-circuit, limiting junction temperature rise to safe levels. |
| Soft-start via VC pin | Uses internal error amplifier source current (25 µA typ.) charging external 0.1 µF capacitor to achieve ~5 ms controlled output ramp-eliminating inrush stress on output capacitors and diode. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V vehicle battery or 24 V factory bus to 5 V/3.3 V for microcontrollers and sensors in harsh environments. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated low-voltage rails with built-in overtemperature and short-circuit protection. Use Value: BIAS pin allows use of local 5 V rail to power CS51414GD8G control circuitry-reducing heat generation and improving reliability at 24 V input and light loads. | Use Scenario: Powering CAN transceivers and LIN interface ICs in automotive body electronics where input voltage varies from 9 V (cranking) to 16 V (running). IC Role / Device Role / Timing Role: Fixed-frequency buck controller managing stable 5 V supply with fast transient response to handle burst-mode communication loads. Use Value: V2 architecture delivers <10 µs recovery from 1 A load step-preventing brownout during CAN frame transmission without oversized output capacitance. |
| Point-of-Load Converter for FPGA I/O | Smart Sensor Node Power Management |
Use Scenario: Generating clean 1.8 V or 2.5 V for FPGA I/O banks from a 12 V intermediate rail in telecom or test equipment. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator with BOOST-driven switch minimizing EMI and thermal footprint. Use Value: 520 kHz operation allows use of small 2.2 µH inductors and ceramic capacitors-reducing board area by >30% vs. 260 kHz alternatives like CS51412. | Use Scenario: Battery-powered environmental sensor node requiring long sleep duration and rapid wake-up with minimal voltage droop. IC Role / Device Role / Timing Role: Main DC-DC converter supplying MCU and RF transceiver with programmable enable via SHDNB pin. Use Value: 20 µA shutdown current extends battery life; soft-start prevents reset glitches during wake-up; thermal shutdown ensures safety during enclosure overheating. |
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; uses external sync instead of foldback-based short-circuit protection. | Lacks BIAS pin efficiency boost at high VIN; relies on external sync for noise reduction rather than internal foldback. | Select when legacy LT1376 layout reuse is required and BIAS-driven efficiency gains are non-critical. |
| MP2307DN-LF-Z | 500 kHz, 3 A, integrated MOSFETs; no BOOST or BIAS pins; uses current-mode control instead of V2. | Higher current rating but slower transient response; lacks V2-based simplicity and foldback protection. | Select when higher output current is needed and design can accommodate larger compensation network and reduced short-circuit robustness. |
Compared with LT1376CS8#PBF, CS51414GD8G adds BIAS pin efficiency and autonomous foldback protection; compared with MP2307DN-LF-Z, it trades higher current for superior transient response, lower EMI, and simpler loop compensation-making it optimal for space-constrained, high-reliability 1.5 A applications.
Availability
CS51414GD8G is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, FPGA point-of-load converters, and smart sensor node power management requiring stable component supply across extended temperature and voltage ranges.
Supply support for CS51414GD8G 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 leader focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications with emphasis on reliability and sustainability.
The CS5141X product line was designed specifically for high-density, high-efficiency buck conversion in industrial and automotive systems-emphasizing robust protection, simplified design, and performance consistency across wide input voltage ranges.
FAQ
What is the maximum input voltage rating for CS51414GD8G?
The CS51414GD8G 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 per the Absolute Maximum Ratings table. The device maintains regulation and protection functionality across this full range, including thermal shutdown activation at 185 °C junction temperature.
Does CS51414GD8G support synchronization to an external clock?
No, CS51414GD8G does not support external synchronization. It belongs to the "Bias" variant group (CS51412/CS51414), which replaces SYNC functionality with the BIAS pin. Only CS51411 and CS51413 include the SYNC pin; CS51414GD8G relies on its internal 520 kHz oscillator and foldback-based short-circuit protection instead.
How does the BIAS pin improve efficiency in CS51414GD8G?
The BIAS pin in CS51414GD8G allows powering internal control circuitry (error amplifier, comparators, oscillator) from a 3.3–6.0 V external supply instead of VIN. At high input voltages (e.g., 36 V), this bypasses the internal LDO, reducing quiescent power dissipation by >50% and improving light-load efficiency-particularly valuable in industrial systems with variable input rails.
What protection features are integrated into CS51414GD8G?
CS51414GD8G integrates thermal shutdown (185 °C trip, 42 °C hysteresis), cycle-by-cycle current limiting (2.3 A typical), frequency foldback (to 130 kHz), current limit foldback (to ~1.5 A), and soft-start. These operate autonomously without external components-ensuring robust operation during startup, overload, short-circuit, and thermal stress events.
Can CS51414GD8G be used with ceramic output capacitors?
Yes, CS51414GD8G is fully compatible with low-ESR ceramic output capacitors. Its V2 control architecture uses the output ripple as part of the feedback path; for MLCCs with near-zero ESR, the datasheet recommends adding a DCR-sensing network or voltage feed-forward circuit to generate a stable control ramp-ensuring stability and fast transient response without tantalum or polymer caps.
CS51414GD8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
CS51414GD8G FAQ
1.How can I place an order for CS51414GD8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414GD8G 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 CS51414GD8G reliable?
The price and inventory of CS51414GD8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414GD8G is usually 5 days.
3.What payment methods are accepted for CS51414GD8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414GD8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414GD8G?
CS51414GD8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414GD8G 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 CS51414GD8G?
For technical support, including CS51414GD8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414GD8G requirements.
6.How does Aetrix verify that CS51414GD8G is sourced from the original manufacturer or authorized distributors?
All CS51414GD8G 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 CS51414GD8G meets industry standards.
7.What is the process for return or replacement of CS51414GD8G?
All CS51414GD8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51414GD8G, 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 CS51414GD8G part is unused and in its original packaging.
Return procedure for CS51414GD8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS51414GD8G 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…
