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onsemi CS51414GDR8G
- Part No.:
- CS51414GDR8G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CS51414GDR8G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,734
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Product details
Overview
CS51414GDR8G 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 voltage via V2 control architecture. It integrates an on-chip NPN power switch, supports soft-start, thermal shutdown, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection. It is used in industrial power supplies, distributed DC-DC conversion, and embedded systems requiring high-efficiency step-down regulation.
For engineers reviewing the CS51414GDR8G datasheet, pinout, applications, or equivalent options, key selection considerations include its 520 kHz switching frequency, BIAS pin operation (3.3–6.0 V), −40 °C to 85 °C extended temperature grade (E suffix), SOIC-8 package, and functional pin-compatibility with LT1376.
Technical Context
The CS51414GDR8G implements V2 control architecture, where both inputs to the PWM comparator derive from the output feedback signal - one path providing fast AC ripple (FFB) and the other a filtered DC error (SFB) - enabling ultrafast transient response independent of error amplifier bandwidth. Its internal transconductance error amplifier (6.4 mA/V) drives the VC pin for loop compensation using only a single 0.1 µF capacitor to ground.
This device uses an integrated NPN power switch with BOOST-pin bootstrapped drive to minimize saturation voltage (0.4–1.0 V at 1.5 A), and features dedicated BIAS pin operation that powers internal circuitry from an auxiliary 3.3–6.0 V supply - reducing quiescent dissipation under high-VIN, light-load conditions. Frequency foldback (to 130 kHz) and current limit foldback (to ~1.5 A) activate when VFB falls below 0.29 V, protecting during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz nominal; enables compact magnetics and low-output-ripple designs with <10 µH inductors. |
| Output Current Capability | 1.5 A continuous; supported by on-chip NPN switch with guaranteed 1.6 A current limit threshold. |
| Input Voltage Range | 4.5 V to 40 V; suitable for 12 V/24 V industrial rails and automotive battery-supplied systems. |
| BIAS Pin Operating Range | 3.3 V to 6.0 V; allows efficiency optimization by powering control circuitry separately from VIN. |
| VFB Foldback Threshold | 0.29–0.36 V; triggers frequency reduction (×0.25) and current limit foldback for robust short-circuit survival. |
| Shutdown Quiescent Current | 20 µA typical; reduces system standby power when SHDNB is pulled low. |
| Thermal Shutdown Trip Point | 175–195 °C; provides fail-safe junction protection with 42 °C hysteresis for reliable recovery. |
Pinout & Package
CS51414GDR8G is housed in an SOIC-8 (Case 751) package with exposed pad for thermal enhancement. Pin assignments are validated per onsemi datasheet Rev. 22 (May 2025).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Bootstrap drive node | Provides elevated base drive to on-chip NPN switch; connected to external diode/capacitor network to reduce VCE(sat) and improve efficiency. |
| 2,3,4: VIN | Main power input | Supplies collector of internal NPN switch and bias circuitry; accepts 4.5–40 V; multiple pins reduce trace resistance and thermal stress. |
| 5,6,7: VSW | Switch emitter node | Connects to inductor; swings negative to −1.0 V (t < 50 ns); requires catch diode and low-inductance layout. |
| 8: BIAS | Auxiliary supply input | Accepts 3.3–6.0 V to power internal logic and error amplifier - bypasses VIN rail to cut quiescent loss at high input voltages. |
| -: SHDNB | Active-low shutdown | TTL-compatible input; pulls IC into sleep mode (<85 µA IQ) when voltage < 1.0 V; internal pull-up enables default-on operation. |
| -: GND | Power return | Common reference for all analog and power circuits; must be low-impedance connection to minimize noise coupling. |
| -: VFB | Feedback input | Connects to resistor divider from output; 0.29 V threshold initiates foldback; 2% reference tolerance ensures ±2% output regulation. |
| -: VC | Error amplifier output | Provides compensated control signal to PWM; clamped to prevent latch-up; 0.1 µF to ground sets dominant pole for stable V2 loop. |
Key Features
| Feature | Design Value |
|---|---|
| V2 control architecture | Delivers sub-10 µs load transient response without complex compensation - eliminates need for type-II/type-III networks. |
| BOOST-pin bootstrapped drive | Reduces NPN saturation voltage to ≤0.7 V at 1.5 A, cutting conduction loss by >30% vs. non-bootstrapped operation. |
| BIAS pin support | Enables >15% efficiency gain at 36 VIN/1 A vs. VIN-powered mode by eliminating LDO dropout losses in control circuitry. |
| Frequency and current foldback | Reduces short-circuit power dissipation by 75% via simultaneous 4× frequency reduction and 40% current limit decrease. |
| Soft-start via VC pin | Uses internal error amplifier source current (25 µA typ.) charging external 0.1 µF capacitor - achieves ~5 ms monotonic output ramp without extra components. |
Applications
| Industrial Power Supply | Distributed DC-DC Conversion |
|---|---|
Use Scenario: Step-down conversion from 24 V factory bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing power delivery, transient suppression, and fault protection in DIN-rail mounted equipment. Use Value: V2 architecture maintains ±1% regulation during 1 A load steps; BIAS pin sustains >88% efficiency at 24 VIN/100 mA output. |
Use Scenario: Local regulation on PCBs with mixed-voltage ASICs, FPGAs, and microcontrollers. IC Role / Device Role / Timing Role: Standalone point-of-load regulator replacing multi-rail PMICs where cost and board area are constrained. Use Value: SOIC-8 footprint and single 0.1 µF VC capacitor simplify layout; 520 kHz switching permits <2.2 µH inductors and 10 µF ceramic output caps. |
| Automotive Body Control Module | Embedded Networking Equipment |
Use Scenario: Powering CAN transceivers, LIN controllers, and LED drivers from 12 V battery rail with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-robust buck stage preceding LDOs; handles 4.5–16 V input range including cranking dips and load-dump surges. Use Value: 40 V absolute max VIN rating and thermal shutdown (175 °C trip) ensure reliability across automotive temperature extremes. |
Use Scenario: Secondary 3.3 V rail generation for Ethernet PHYs, PoE interface ICs, and management microcontrollers. IC Role / Device Role / Timing Role: High-SRPM buck regulator supporting burst-mode operation and low-noise sequencing requirements. Use Value: SHDNB pin enables synchronized power-down during link idle; 85 µA shutdown current minimizes standby drain in always-on ports. |
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 current-mode control instead of V2. | Lacks external bias option and foldback protection; requires more complex compensation. | Select when legacy design reuse or Linear Tech ecosystem integration is required. |
| MP2315GJ-Z | 500 kHz, 2 A, 4.5–26 V input; integrated MOSFETs; no BOOST/BIAS pins; uses constant-on-time control. | Higher current, smaller QFN package; lacks V2 transient performance and high-VIN support. | Select for space-constrained 12 V systems needing higher output current and simpler BOM. |
Compared with LT1376CS8#PBF and MP2315GJ-Z, CS51414GDR8G uniquely combines V2 ultrafast transient response, 40 V input tolerance, and BIAS-driven efficiency - making it optimal for industrial and automotive applications demanding robustness and dynamic performance over raw current rating or footprint size.
Availability
CS51414GDR8G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and embedded networking equipment requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for CS51414GDR8G 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 for automotive, industrial, cloud, and IoT applications, with manufacturing aligned to ISO/TS 16949 and environmental standards.
The CS5141X product line was designed specifically for high-reliability, wide-input-voltage buck conversion in harsh environments - emphasizing thermal resilience, fault tolerance, and simplified design through V2 architecture and integrated protection.
FAQ
What is the maximum input voltage rating for CS51414GDR8G?
The CS51414GDR8G has an absolute maximum input voltage rating of 40 V on the VIN pins, with operational specification from 4.5 V to 40 V. This allows direct use with 24 V industrial buses and 12 V automotive systems including load-dump transients. Exceeding 40 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does CS51414GDR8G support synchronization to an external clock?
No, CS51414GDR8G 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 offer SYNC capability. Attempting to drive a clock signal onto the BIAS pin of CS51414GDR8G may damage the IC.
How does the BIAS pin improve efficiency in CS51414GDR8G?
The BIAS pin in CS51414GDR8G powers internal circuitry (error amplifier, comparators, oscillator) from an external 3.3–6.0 V supply instead of VIN, eliminating LDO dropout losses. At 36 VIN/100 mA output, this reduces quiescent dissipation by ~12 mW versus VIN-powered operation - directly improving light-load efficiency by up to 15%.
What package type is used for CS51414GDR8G?
CS51414GDR8G uses the SOIC-8 package (Case 751, D suffix), with gull-wing leads and an exposed thermal pad. The "R8G" suffix confirms Pb-free (RoHS-compliant) SOIC-8 packaging. It is not offered in DFN or other variants - the DFN-18 package is exclusive to CS51411/CS51412/CS51413/CS51414 part numbers ending in "MN".
What protection features are built into CS51414GDR8G?
CS51414GDR8G integrates thermal shutdown (trip at 175–195 °C), cycle-by-cycle current limiting (1.6–3.0 A threshold), frequency foldback (to 130 kHz), current limit foldback (to ~1.5 A), and soft-start. These operate autonomously without external components - ensuring safe startup, overload recovery, and fault containment in unattended systems.
CS51414GDR8G 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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CS51414GDR8G FAQ
1.How can I place an order for CS51414GDR8G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS51414GDR8G 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 CS51414GDR8G reliable?
The price and inventory of CS51414GDR8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS51414GDR8G is usually 5 days.
3.What payment methods are accepted for CS51414GDR8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS51414GDR8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS51414GDR8G?
CS51414GDR8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS51414GDR8G 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 CS51414GDR8G?
For technical support, including CS51414GDR8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS51414GDR8G requirements.
6.How does Aetrix verify that CS51414GDR8G is sourced from the original manufacturer or authorized distributors?
All CS51414GDR8G 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 CS51414GDR8G meets industry standards.
7.What is the process for return or replacement of CS51414GDR8G?
All CS51414GDR8G units undergo pre-shipment inspection (PSI). If there is an issue with CS51414GDR8G, 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 CS51414GDR8G part is unused and in its original packaging.
Return procedure for CS51414GDR8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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