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onsemi CS51412ED8
- Part No.:
- CS51412ED8
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412ED8.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,353
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Product details
Overview
CS51412ED8 from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with external BIAS supply capability for improved light-load efficiency in high-input-voltage applications. It integrates an on-chip NPN power switch, V² control architecture for ultrafast transient response, and protection features including thermal shutdown, cycle-by-cycle current limiting, and frequency foldback. It operates from 4.5 V to 40 V input and delivers regulated output in industrial power supplies.
For engineers reviewing the CS51412ED8 datasheet, pinout, applications, or equivalent options, key selection considerations include its BIAS-enabled efficiency optimization at VIN > 12 V, 260 kHz switching frequency, SOIC-8 package compatibility with LT1376, and V² control loop stability with ceramic output capacitors.
Technical Context
The CS51412ED8 implements V² control architecture, where both PWM comparator inputs derive from the output voltage-fast feedback (AC + DC) and slow feedback (error amplifier output)-enabling transient response independent of error amplifier bandwidth. Its transconductance error amplifier (6.4 mA/V) interfaces via VC and VFB pins, with internal 1.270 V reference (±2.0% tolerance).
It uses an integrated NPN power switch with BOOST-pin-assisted saturation (VCE(sat) ≤ 0.7 V @ 1.5 A), and supports external BIAS supply (3.3–6.0 V) to power internal circuitry-reducing quiescent dissipation when VIN exceeds 12 V. Frequency foldback activates below 0.29 V on VFB, reducing switching frequency to 65 kHz and current limit to ~1.5 A during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz nominal; enables compact magnetics and EMI filtering for industrial DC/DC converters |
| Output Current | 1.5 A continuous; supported by on-chip NPN switch with BOOST-assisted saturation |
| Input Voltage Range | 4.5 V to 40 V; suitable for 12 V/24 V/36 V industrial bus rails |
| BIAS Supply Range | 3.3 V to 6.0 V; powers internal bias rails to reduce VIN-related quiescent loss |
| V² Reference Voltage | 1.270 V ±2.0%; sets output voltage via resistive divider on VFB pin |
| Shutdown Quiescent Current | 20 µA typical; enables low-power sleep mode via active-low SHDNB |
| Thermal Shutdown Threshold | 185 °C typical; latches off until junction cools by 42 °C hysteresis |
Pinout & Package
CS51412ED8 is housed in an SOIC-8 (Case 751) package with standard 1.27 mm pitch and exposed pad not present. Pin functions are validated per onsemi datasheet Rev. 22 (May 2025).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive node | Supplies elevated base drive to NPN switch; reduces VCE(sat) and improves efficiency at high VIN |
| 2: VIN | Main power input | Connects to 4.5–40 V source; supplies collector of internal NPN switch |
| 3: VSW | Switch emitter node | Drives inductor; swings negative to −1.0 V (50 ns max); requires catch diode |
| 4: BIAS | External bias rail input | Accepts 3.3–6.0 V to power internal logic-bypasses VIN LDO, cutting quiescent loss |
| 5: SHDNB | Active-low enable | TTL-compatible shutdown; pulls <1.0 V to enter 20 µA sleep mode; internal pull-up |
| 6: GND | Power return | Common reference for all internal circuits and external compensation network |
| 7: VFB | Error amplifier inverting input | Monitors output via resistor divider; triggers foldback if <0.29 V |
| 8: VC | Error amplifier output | Provides compensated loop signal to PWM; connect 0.1 µF to GND for pole placement |
Key Features
| Feature | Design Value |
|---|---|
| V² control architecture | Delivers load transient response independent of error amplifier bandwidth; stabilizes loop with ceramic output caps |
| BOOST-assisted NPN switch | Reduces conduction loss by maintaining saturation at high VIN; enables >90% efficiency at 24 V→5 V |
| BIAS pin operation | Lowers total IC dissipation by powering internal rails from regulated 3.3–6 V instead of VIN, critical for high-VIN/light-load |
| Frequency and current foldback | Under short-circuit, cuts frequency to 65 kHz and peak current to ~1.5 A-limits power dissipation and thermal stress |
| Soft-start via VC pin | Uses error amplifier's 25 µA source current charging external 0.1 µF cap; achieves ~5 ms ramp without extra components |
Applications
| Industrial 24 V DC Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Converting 24 V battery rail to 5 V for microcontroller, CAN transceivers, and sensors in harsh under-hood environments. IC Role / Device Role / Timing Role: Primary buck controller providing regulated 5 V with BIAS pin powered from local 5 V rail to minimize heat at 24 V input. Use Value: Enables >88% efficiency at 100 mA load and 24 V input-reducing thermal design burden versus non-BIAS alternatives. |
Use Scenario: Powering infotainment subsystems requiring stable 3.3 V from variable 9–16 V automotive battery with cold-crank immunity. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with V² control ensuring fast recovery from 6 V cold-crank dips without output droop. Use Value: Maintains regulation during 6 V transients due to V²'s feed-forward response-no additional hold-up capacitance needed. |
| Programmable Logic Controller (PLC) I/O Module | Industrial Motor Drive Auxiliary Supply |
Use Scenario: Generating isolated 5 V for digital I/O isolation barriers and ADC references in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: High-reliability buck stage with thermal shutdown and cycle-by-cycle current limiting protecting against field-wiring faults. Use Value: Foldback protection limits fault energy during sustained overloads-prevents damage to downstream optocouplers and level shifters. |
Use Scenario: Providing 15 V gate drive supply for IGBT drivers and 3.3 V logic supply from 48 V DC bus in servo drives. IC Role / Device Role / Timing Role: Dual-output buck controller (using two CS51412ED8s) with synchronized switching to suppress common-mode noise coupling into sensitive analog circuits. Use Value: 260 kHz fixed frequency allows predictable EMI filter design; SOIC-8 footprint simplifies layout in space-constrained gate driver PCBs. |
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 current-mode architecture | Requires slope compensation for stability with ceramic outputs; slower transient response than CS51412ED8 under step loads | Select LT1376CS8#PBF only if legacy design reuse or Analog Devices ecosystem alignment is required |
| MP2307DN-LF-Z | SOIC-8, 2 A rating, 500 kHz switching; integrated MOSFETs (not bipolar); no BIAS pin; uses voltage-mode control | Lacks BIAS efficiency boost at high VIN; higher switching loss at 24 V input; requires external compensation | Choose MP2307DN-LF-Z for cost-sensitive, high-frequency designs where 24 V→5 V efficiency >85% is acceptable |
Compared with LT1376CS8#PBF and MP2307DN-LF-Z, the CS51412ED8 uniquely combines BIAS-enabled high-VIN efficiency, V²'s ceramic-capable stability, and factory-trimmed 260 kHz frequency-making it optimal for industrial 24 V systems demanding robustness and minimal external components.
Availability
CS51412ED8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS51412ED8 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications. It emphasizes high-reliability analog and power management solutions.
The CS51412ED8 belongs to the CS5141X family of V²-controlled buck regulators designed specifically for high-transient industrial and automotive DC/DC conversion where ceramic capacitor compatibility and BIAS-driven efficiency are critical.
FAQ
What is the function of the BIAS pin on the CS51412ED8?
The BIAS pin on the CS51412ED8 accepts a 3.3 V to 6.0 V external supply to power internal control circuitry-bypassing the VIN-based LDO. This reduces quiescent power dissipation significantly at high input voltages (e.g., 24 V or 36 V), improving light-load efficiency. When unused, the BIAS pin must be left floating; connecting it to GND or VIN disables BIAS operation.
Does the CS51412ED8 support synchronization to an external clock?
No, the CS51412ED8 does not support external synchronization. Synchronization capability is exclusive to the CS51411 and CS51413 variants in the family. The CS51412ED8 is designated as a "Bias" variant (not "Sync"), and its pinout omits the SYNC terminal-replacing it with the BIAS pin in SOIC-8 packaging.
What is the minimum output voltage achievable with the CS51412ED8?
The CS51412ED8 regulates output voltage using a resistor divider on the VFB pin, referenced to its internal 1.270 V bandgap. With standard 1% resistors, the practical minimum output is 1.27 V. Lower outputs require precision divider networks and careful layout to mitigate noise injection on VFB, but are not recommended for production due to reduced regulation margin and increased sensitivity to trace resistance.
Can the CS51412ED8 drive a MOSFET instead of using its internal NPN switch?
No, the CS51412ED8 is not a controller IC-it integrates a dedicated on-chip NPN power transistor and is not designed to drive external MOSFETs. Its VSW pin is the emitter of that internal NPN device. Attempting to substitute an external MOSFET would violate the BOOST drive topology and disable critical protection features like current limiting and thermal shutdown.
What is the maximum allowable voltage on the BOOST pin of the CS51412ED8?
The absolute maximum voltage on the BOOST pin of the CS51412ED8 is 40 V, as specified in the Maximum Ratings table. Exceeding this risks permanent damage. In normal bootstrapped operation, BOOST voltage equals VIN + VOUT − VF (diode forward drop), so design must ensure this sum stays ≤40 V-for example, at VIN = 36 V and VOUT = 5 V, a Schottky diode with VF ≥ 1.0 V is required to keep BOOST ≤ 40 V.
CS51412ED8 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
CS51412ED8 FAQ
1.How can I place an order for CS51412ED8 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412ED8 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 CS51412ED8 reliable?
The price and inventory of CS51412ED8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412ED8 is usually 5 days.
3.What payment methods are accepted for CS51412ED8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412ED8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412ED8?
CS51412ED8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412ED8 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 CS51412ED8?
For technical support, including CS51412ED8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412ED8 requirements.
6.How does Aetrix verify that CS51412ED8 is sourced from the original manufacturer or authorized distributors?
All CS51412ED8 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 CS51412ED8 meets industry standards.
7.What is the process for return or replacement of CS51412ED8?
All CS51412ED8 units undergo pre-shipment inspection (PSI). If there is an issue with CS51412ED8, 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 CS51412ED8 part is unused and in its original packaging.
Return procedure for CS51412ED8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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