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onsemi CS51412GDR8G
- Part No.:
- CS51412GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51412GDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
CS51412GDR8G from onsemi is a 1.5 A, 260 kHz fixed-frequency buck regulator IC with external BIAS supply capability and V² control architecture. It operates from 4.5 V to 40 V input, delivers ultrafast transient response via output-derived ramp control, and integrates an on-chip NPN power switch with BOOST pin for saturation optimization. It is used in industrial power supplies requiring high efficiency at light loads and wide VIN ranges.
For engineers reviewing the CS51412GDR8G datasheet, pinout, applications, or equivalent options, key selection criteria include BIAS pin support (3.3–6.0 V), 260 kHz switching frequency, thermal shutdown (175–195 °C trip), 0.29 V foldback threshold, and SOIC-8 package compatibility with LT1376.
Technical Context
The CS51412GDR8G implements V² control - using the feedback signal (VFB) both as DC error reference and AC control ramp - enabling load-transient response independent of error amplifier bandwidth. Its transconductance error amplifier (6.4 mA/V) drives the VC node with simplified compensation (0.1 µF typical).
It features cycle-by-cycle current limiting (1.6–3.0 A), frequency foldback (25% nominal frequency under short circuit), and soft-start via VC pin charging. The BIAS pin powers internal circuitry from an external 3.3–6.0 V rail, reducing quiescent dissipation when VIN is high - critical for >24 V input, light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 260 kHz ±13% - enables compact magnetics and EMI filtering; tighter tolerance than standard oscillator-based controllers. |
| Output Current | 1.5 A continuous - supported by integrated NPN switch 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 12 V, 24 V, and 36 V industrial bus rails without pre-regulation. |
| BIAS Pin Voltage | 3.3 V to 6.0 V - allows efficient biasing from regulated 3.3 V/5 V rail, cutting IC quiescent loss by >50% vs. VIN-powered operation at high VIN. |
| VFB Foldback Threshold | 0.29 V (min) - triggers current limit reduction to ~1.5 A and 65 kHz switching under overload, limiting thermal stress. |
| Shutdown Quiescent Current | 20 µA typical - ensures <100 µW standby power in sleep mode, suitable for battery-backed systems. |
| Thermal Shutdown Trip | 175–195 °C - protects against sustained overloads; 42 °C hysteresis prevents oscillation near trip point. |
Pinout & Package
CS51412GDR8G is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin 1 is BOOST; pin 2 is VIN; pin 3 is VSW; pin 4 is BIAS; pin 5 is SHDNB; pin 6 is GND; pin 7 is VFB; pin 8 is VC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Bootstrap drive voltage source | Provides elevated base drive to NPN switch; reduces saturation voltage and improves efficiency - requires external 0.1 µF capacitor and diode. |
| VIN | Main power input | Supplies collector of internal NPN switch and bias for high-side driver; rated to 40 V absolute max. |
| VSW | Switch emitter node | Connects to inductor; swings negative during flyback - requires catch diode and low-inductance layout to limit ringing. |
| BIAS | External bias rail input | Enables internal logic and error amplifier from 3.3–6.0 V supply - bypasses VIN LDO, reducing power loss at high input voltages. |
| SHDNB | Active-low shutdown control | TTL-compatible input; pulls IC into sleep mode (<85 µA) when ≤1.0 V; internal pull-up eliminates need for external resistor. |
| GND | Power return reference | Common return for switch emitter, error amp, and internal regulators - must be low-impedance connection to minimize noise coupling. |
| VFB | Feedback input | Inverting input of error amplifier; 0.29 V threshold initiates foldback protection - sets output voltage via resistive divider (e.g., 3.3 V = R1/R2 = 10.2k/1.0k). |
| VC | Error amplifier output | Drives PWM comparator; clamped to limit recovery time after overcurrent - compensation capacitor (0.1 µF) sets dominant pole for stability. |
Key Features
| Feature | Design Value |
|---|---|
| V² Control Architecture | Uses output ripple as control ramp - eliminates need for current-sense resistor and enables sub-10 µs load transient recovery without complex compensation. |
| External BIAS Supply | Reduces IC power dissipation by powering internal circuitry from 3.3–6.0 V rail - improves light-load efficiency by up to 8% at VIN = 36 V. |
| Frequency & Current Foldback | Under short circuit, switches to 65 kHz and limits peak current to ~1.5 A - cuts power dissipation by >60% versus full-frequency operation. |
| Soft-Start via VC Pin | No dedicated SS pin required - 0.1 µF capacitor on VC provides ~5 ms controlled output ramp - prevents inrush stress on output capacitors and catch diode. |
| Thermal Shutdown with Hysteresis | 175–195 °C trip range with 42 °C hysteresis - avoids thermal cycling during marginal overload conditions. |
Applications
| Industrial 24 V DC-DC Converter | Automotive Body Control Module Power |
|---|---|
Use Scenario: Converting 24 V vehicle battery to 3.3 V for microcontroller and CAN transceiver in body electronics. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3 V rail with BIAS pin powered from 5 V MCU supply to maximize efficiency at partial load. Use Value: Achieves >88% efficiency at 100 mA load and 24 V input - extends battery life and reduces thermal load in sealed enclosures. | Use Scenario: Powering programmable logic controllers (PLCs) in factory automation with 36 V industrial bus input. IC Role / Device Role / Timing Role: Fixed-frequency buck controller delivering 5 V/1.5 A with V² control ensuring stable regulation during motor startup transients. Use Value: Maintains ±1.5% output regulation across 10–100% load step changes - eliminates need for post-regulation LDOs. |
| Telecom Remote Radio Unit (RRU) | Medical Point-of-Care Instrumentation |
Use Scenario: Generating isolated 12 V bias for RF power amplifiers in outdoor wireless infrastructure. IC Role / Device Role / Timing Role: High-input-voltage buck stage (VIN = 48 V) using BIAS pin tied to local 5 V rail - minimizes heat generation in thermally constrained RF enclosure. Use Value: Reduces junction temperature rise by 22 °C vs. VIN-biased operation - enables reliable 24/7 operation without forced air cooling. | Use Scenario: Powering portable diagnostic devices with lithium-ion battery input (3.6–4.2 V) and 5 V system rail requirement. IC Role / Device Role / Timing Role: Buck regulator operating in 4.5–40 V range with soft-start and shutdown control for safe power sequencing during battery insertion. Use Value: 20 µA shutdown current extends battery runtime in standby mode - meets IEC 62304 Class C energy budget requirements. |
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 but uses voltage-mode control; no BIAS pin; higher quiescent current (6 mA vs. 6.25 mA active, 20 µA shutdown). | Lacks V² transient performance and BIAS efficiency boost - less suitable for high-VIN, light-load scenarios. | Choose only if legacy LT1376 layout reuse is mandatory and transient response is non-critical. |
| MP2315GJ-Z | 40 V, 1.5 A synchronous buck; 500 kHz; no BIAS pin; integrated MOSFETs; smaller QFN-8 package. | Higher frequency enables smaller inductors but lacks V² architecture - slower transient recovery and more complex loop compensation. | Select for space-constrained designs where footprint matters more than sub-10 µs load steps. |
Compared with LT1376CS8#PBF and MP2315GJ-Z, CS51412GDR8G uniquely combines BIAS-enabled efficiency at high VIN, V²-controlled transient response, and SOIC-8 manufacturability - making it optimal for industrial and automotive power stages demanding robustness and design simplicity.
Availability
CS51412GDR8G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and telecom power conversion requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for CS51412GDR8G 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, wide-input-voltage buck conversion in space- and thermal-constrained environments - emphasizing V² control for fast transient immunity and BIAS/SYNC flexibility for system-level optimization.
FAQ
What is the function of the BIAS pin on the CS51412GDR8G?
The BIAS pin on the CS51412GDR8G accepts an external 3.3 V to 6.0 V supply to power internal control circuitry - bypassing the VIN LDO. This reduces quiescent power dissipation significantly, especially at high input voltages (e.g., 36 V), improving light-load efficiency by up to 8%. When unused, the BIAS pin must be left floating; connecting it to ground or VIN will disable the feature or damage the device.
Does the CS51412GDR8G support synchronization to an external clock?
No, the CS51412GDR8G does not support external synchronization. Synchronization capability is exclusive to the CS51411 and CS51413 variants (marked "Sync" in the product selection guide). The CS51412GDR8G is designated as a "Bias" variant and lacks the SYNC pin - its oscillator is internally trimmed to 260 kHz with ±13% tolerance and no external frequency adjustment.
What is the minimum output voltage achievable with the CS51412GDR8G?
The CS51412GDR8G does not have a fixed output voltage - it is a controller requiring external feedback resistors. With the internal 1.270 V reference (±2.0% tolerance), the minimum practical output is ~1.3 V, set by VOUT = 1.270 V × (1 + R1/R2). Lower outputs require precision resistors and careful layout to mitigate noise sensitivity at the VFB node, but the architecture supports down to 1.25 V with appropriate divider design.
How does the V² control architecture in the CS51412GDR8G improve transient response?
The V² control in the CS51412GDR8G uses the output voltage ripple (via VFB) directly as the PWM ramp signal - eliminating dependence on error amplifier bandwidth for transient correction. Load steps cause immediate modulation of the duty cycle through the fast feedback path, achieving sub-10 µs recovery without additional compensation components. This contrasts with voltage-mode controllers that require multi-pole compensation and exhibit slower response.
Can the CS51412GDR8G operate with an input voltage below 4.5 V?
No, the CS51412GDR8G has a specified minimum input voltage of 4.5 V per the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables. Startup voltage is guaranteed at 2.2–4.4 V, but stable regulation and full functionality (including BIAS operation and current limiting) require VIN ≥ 4.5 V. Operation below this risks undervoltage lockout activation, erratic switching, or failure to sustain 1.5 A output current.
CS51412GDR8G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
CS51412GDR8G FAQ
1.How can I place an order for CS51412GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51412GDR8G 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 CS51412GDR8G reliable?
The price and inventory of CS51412GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51412GDR8G is usually 5 days.
3.What payment methods are accepted for CS51412GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51412GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51412GDR8G?
CS51412GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51412GDR8G 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 CS51412GDR8G?
For technical support, including CS51412GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51412GDR8G requirements.
6.How does Aetrix verify that CS51412GDR8G is sourced from the original manufacturer or authorized distributors?
All CS51412GDR8G 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 CS51412GDR8G meets industry standards.
7.What is the process for return or replacement of CS51412GDR8G?
All CS51412GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51412GDR8G, 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 CS51412GDR8G part is unused and in its original packaging.
Return procedure for CS51412GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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