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onsemi CS51412ED8G
- Part No.:
- CS51412ED8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412ED8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
CS51412ED8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with external bias capability, designed for high-efficiency DC-DC conversion in industrial and embedded power supplies. It features V² control architecture, 4.5 V to 40 V input range, integrated NPN switch, and thermal shutdown protection - enabling stable 3.3 V/5 V output generation in automotive body electronics and programmable logic power rails.
For engineers reviewing the CS51412ED8G datasheet, pinout, applications, or equivalent options, key selection considerations include its BIAS pin operation (3.3–6.0 V external bias support), 260 kHz switching frequency, SOIC-8 package compatibility with LT1376, and foldback current limiting under short-circuit conditions.
Technical Context
The CS51412ED8G implements V² control architecture, using the output voltage ripple as both DC reference and AC control ramp to achieve 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.
This device operates at 260 kHz nominal frequency with ±13% tolerance, supports frequency foldback to 65 kHz during overcurrent, and integrates cycle-by-cycle current limiting (1.6–3.0 A), soft-start via VC pin ramp-up, and thermal shutdown at 175–195 °C. The BIAS pin enables internal circuitry to be powered from an auxiliary 3.3–6.0 V supply, reducing quiescent dissipation at high VIN/light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz ±13% - enables compact magnetics and EMI filtering; foldbacks to 65 kHz under short-circuit to limit power dissipation. |
| Output Current | 1.5 A continuous - delivered by integrated NPN transistor with 0.4–1.0 V saturation voltage at 1.5 A, minimizing conduction loss. |
| Input Voltage Range | 4.5 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| BIAS Pin Voltage | 3.3 V to 6.0 V - powers internal bias rails externally to improve efficiency at high VIN/light load, verified per datasheet Section 10. |
| Current Limit Threshold | 1.6–3.0 A - cycle-by-cycle protection with foldback to 0.9–2.1 A when VFB < 0.29 V, safeguarding switch and diode during overload. |
| Thermal Shutdown Trip | 175–195 °C - protects against sustained overtemperature; includes 42 °C hysteresis for reliable recovery. |
| Shutdown Quiescent Current | 20 µA typical - reduces system standby power when SHDNB is pulled low, critical for always-on applications. |
Pinout & Package
CS51412ED8G is housed in an SOIC-8 (Case 751, D suffix) package with 1.27 mm pitch, RoHS-compliant Pb-free finish, and rated for −40 °C to 85 °C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Bootstrap drive node | Provides elevated base drive to NPN switch; connected to external capacitor-diode network to minimize saturation voltage and boost efficiency. |
| 2,3,4 - VIN | Main power input | Supplies IC core 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 to −1.0 V (t < 50 ns); requires catch diode and short PCB routing to limit EMI. |
| 6 - BIAS | External bias rail input | Enables powering internal logic from 3.3–6.0 V source - reduces VIN-related dissipation and improves light-load efficiency. |
| 7 - GND | Power return | Common reference for all internal circuits; must be low-impedance connection to minimize noise coupling into VFB/VC. |
| 8 - VFB | Feedback input | Inverting input of error amplifier; 0.29–0.36 V threshold triggers frequency/current foldback during fault conditions. |
| - VC | Error amplifier output | Exposed at pin 8? No - VC is internal; not brought out in SOIC-8; only available in DFN variant per datasheet Figure 2. |
| - SHDNB | Active-low shutdown | Not present in CS51412ED8G SOIC-8 pinout - SHDNB is assigned to pin 1 in CS51411/CS51413 variants; CS51412 uses pin 6 for BIAS instead. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Delivers ultrafast load transient response without requiring high-bandwidth error amplifier - regulation stability achieved via output ripple-derived ramp. |
| External BIAS Operation | Reduces IC power dissipation at high input voltage and light load by powering internal circuitry from 3.3–6.0 V auxiliary rail instead of VIN. |
| Frequency & Current Foldback | Under short-circuit (VFB < 0.29 V), switches to 65 kHz and limits peak current to ~1.5 A - cuts power dissipation by >75% vs. full-frequency operation. |
| Integrated NPN Switch | 1.5 A capable with 0.4–1.0 V saturation voltage - eliminates need for external MOSFET driver and reduces BOM count in cost-sensitive designs. |
| Soft-Start via VC Pin | No dedicated SS pin required - error amplifier's output source current (15–35 µA) charges external 0.1 µF capacitor to ramp output voltage gradually over >5 ms. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
Use Scenario: Providing regulated 5 V for microcontroller, CAN transceiver, and sensor interface circuitry in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.5 A at 5 V from 12–24 V battery bus; BIAS pin powered from local 5 V rail to maximize light-load efficiency. Use Value: Eliminates need for discrete driver + MOSFET; V² control ensures <10 µs recovery from 1 A load step without output overshoot. |
Use Scenario: Generating 3.3 V for infotainment MCU and memory subsystem in vehicle door modules with wide input range (9–16 V). IC Role / Device Role / Timing Role: Fixed-frequency buck controller with thermal shutdown and foldback protection - critical for unventilated enclosures exposed to engine bay temperatures. Use Value: 260 kHz switching allows use of small 4.7 µH inductors; SOIC-8 package supports automated assembly and rework in high-volume automotive production. |
| Programmable Logic Supply | Industrial Sensor Hub |
Use Scenario: Powering FPGA configuration banks and I/O banks requiring tightly regulated 3.3 V/2.5 V with fast transient response. IC Role / Device Role / Timing Role: Core DC-DC converter implementing V² control to maintain <±1% output regulation during dynamic FPGA core switching events. Use Value: 2.0% reference tolerance and 0.29 V foldback threshold ensure precise setpoint accuracy and robust fault containment during partial reconfiguration. |
Use Scenario: Supplying 3.3 V to multi-sensor nodes (temperature, humidity, pressure) in factory automation gateways with 24 V field bus input. IC Role / Device Role / Timing Role: High-input-voltage buck regulator leveraging BIAS pin to sustain >85% efficiency at 10 mA load - extending battery life in wireless edge nodes. Use Value: 6.25 mA quiescent current and 20 µA shutdown mode enable >1-year operation on primary lithium cells without external LDO staging. |
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, same SOIC-8 footprint and BIAS functionality; 1.5 A rating, 250 kHz switching; no V² control - uses traditional current-mode architecture. | Lacks V²'s ultrafast transient response; requires more complex compensation; higher EMI due to fixed ramp slope. | Choose LT1376 if legacy design reuse or Analog Devices ecosystem alignment is prioritized over transient performance. |
| MP2451DT-LF-Z | Monolithic 2 A buck with 340 kHz switching; no BIAS pin; uses voltage-mode control; 4.5–36 V input; requires external compensation. | Higher current rating but lacks foldback protection and external bias option; less suitable for high-VIN/light-load scenarios. | Prefer MP2451 for cost-sensitive 2 A applications where BIAS efficiency gains are unnecessary and thermal margin is ample. |
Compared with LT1376CS8#PBF and MP2451DT-LF-Z, CS51412ED8G uniquely combines V² control for sub-10 µs transient recovery, BIAS-enabled efficiency at high input voltage, and integrated foldback protection - making it optimal for space-constrained industrial and automotive power rails demanding reliability under dynamic loads.
Availability
CS51412ED8G is available at Aetrix Electronics and suitable for industrial PLC I/O power, automotive body control modules, and programmable logic supply applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CS51412ED8G 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 CS51412ED8G belongs to onsemi's high-performance analog power management portfolio, engineered specifically for wide-input DC-DC conversion in harsh environments where efficiency, fault resilience, and transient response are critical.
FAQ
What is the function of the BIAS pin on the CS51412ED8G?
The BIAS pin on the CS51412ED8G allows the internal control circuitry to be powered from an external 3.3 V to 6.0 V supply instead of VIN, reducing power dissipation - especially beneficial at high input voltages and light loads. This feature is confirmed in the datasheet Section 10 and distinguishes CS51412ED8G from CS51411/CS51413 variants. When unused, the BIAS pin must be left floating.
Is the CS51412ED8G pin-compatible with the LT1376?
Yes, the CS51412ED8G is functionally pin-compatible with the LT1376 per the onsemi datasheet page 1, which explicitly states "CS51412 and CS51414 are functionally pin-compatible with the LT1376." Both share identical SOIC-8 pin assignments for VIN, VSW, GND, VFB, BOOST, and BIAS - enabling drop-in replacement in existing LT1376 layouts without PCB changes.
Does the CS51412ED8G support synchronization to an external clock?
No, the CS51412ED8G does not support external synchronization. Synchronization capability is exclusive to CS51411 and CS51413 variants (pin 5 = SYNC), while CS51412ED8G uses pin 6 for BIAS and has no SYNC function. This is clearly differentiated in the Product Selection Guide (page 3) and PIN CONNECTIONS diagram (page 2) of the datasheet.
What protection features are integrated into the CS51412ED8G?
The CS51412ED8G integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (to 65 kHz), and soft-start. These protections are active during startup, overload, and short-circuit conditions - verified in Electrical Characteristics tables (pages 4–5) and Applications Information (pages 9–11). No external components are required to enable them.
What is the maximum allowable voltage on the BOOST pin of the CS51412ED8G?
The maximum allowable voltage on the BOOST pin of the CS51412ED8G is 40 V, as specified in the Absolute Maximum Ratings table (page 3). Exceeding this voltage risks permanent damage. The BOOST pin is designed to operate at VIN + 2.5 V during normal bootstrapped operation, and its current includes a constant 7 mA predriver component plus base current proportional to switching current.
CS51412ED8G 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:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51412ED8G FAQ
1.How can I place an order for CS51412ED8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412ED8G 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 CS51412ED8G reliable?
The price and inventory of CS51412ED8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412ED8G is usually 5 days.
3.What payment methods are accepted for CS51412ED8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412ED8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412ED8G?
CS51412ED8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412ED8G 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 CS51412ED8G?
For technical support, including CS51412ED8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412ED8G requirements.
6.How does Aetrix verify that CS51412ED8G is sourced from the original manufacturer or authorized distributors?
All CS51412ED8G 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 CS51412ED8G meets industry standards.
7.What is the process for return or replacement of CS51412ED8G?
All CS51412ED8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51412ED8G, 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 CS51412ED8G part is unused and in its original packaging.
Return procedure for CS51412ED8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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