My Inquiry
My Account
onsemi CS2001YDWF20
- Part No.:
- CS2001YDWF20
- Manufacturer:
- onsemi
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CS2001YDWF20.pdf
- Description:
- IC REG LINEAR SWITCHED CAP REG
- Quantity:
- Payment:
- Shipping:
Inventory:570
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CS2001YDWF20 from onsemi is an automotive-grade smart power supply ASIC for airbag systems, integrating a 1.2 A current-mode switching regulator (boost/flyback configurable), a 5.0 V ±2% 100 mA linear regulator with RESETB output, and a switched-capacitor voltage tripler generating VCHG ≈ VER + 8.0 V. It features smart switchover between VBAT and VER inputs, NERD energy-reserve status indication, and 50 V peak transient tolerance.
For engineers reviewing the CS2001YDWF20 datasheet, pinout, applications, or equivalent options, key selection considerations include its dual-supply smartswitch logic, VER-adjustable fault shutdown, RESETB hysteresis (25–200 mV), tripler output clamping (25–40 V), and SO-20L package thermal resistance (RΘJA = 55 °C/W).
Technical Context
The CS2001YDWF20 implements a dual-path power architecture: under normal battery conditions (VBAT > 8.0 V), the linear regulator draws from VBAT while the switcher operates; during low-battery events, it seamlessly transfers linear regulation to VER and disables the switcher via internal smartswitch logic. This reduces power dissipation and eliminates need for oversized inductors.
Its voltage tripler uses CPUMP-driven charge-pump topology with externally timed oscillator (135–165 kHz), delivers VCHG up to 40 V (clamped), and supports external energy reserve monitoring via VER detection (1.5–6.5 V threshold) and NERD logic-level reporting. Protection includes overtemperature shutdown (160–210 °C), current limiting (1.2 A switch / 120 mA linear), and 50 V transient survival without linear regulator dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Linear Output | 5.0 V ±2% @ 100 mA - stable MCU core supply with ≤0.025 V load/line regulation. |
| Switch Peak Current | 1.2 A internal switch - enables compact boost/flyback designs for energy reserve charging. |
| Voltage Tripler Output | VCHG = VER + 6.25–8.0 V (clamped to 40 V max) - drives high-side FET gates without external boost IC. |
| RESETB Threshold | 4.5–4.85 V rising, 4.5–4.825 V falling - provides clean microprocessor reset with 25–200 mV hysteresis. |
| Smart Switch Threshold | 6.5–8.0 V with 0.5–1.0 V hysteresis - triggers automatic switchover from VBAT to VER at defined low-battery point. |
| Transient Tolerance | 50 V peak (36 V load dump) - maintains linear regulation without shutdown during automotive transients. |
| Operating Temp | −40°C to +125°C junction - qualified for under-hood airbag control module environments. |
Pinout & Package
CS2001YDWF20 is housed in a thermally enhanced SO-20L (Case 751D) package with eight ground pins (GND1–GND8) for noise isolation and EMI reduction in safety-critical airbag systems. The 20-pin layout supports separate power domains (VER, VBAT, VCHG, VSW), analog sensing (VFB, CPUMP, COMP, IBIAS), and digital interface (RESETB, NERD, SWSD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VER | Energy reserve input | Accepts 8–25 V external reserve source; enables switchover and tripler operation. |
| 2 VBAT | Battery input | Main 8–16 V automotive supply; powers linear regulator and switcher under normal conditions. |
| 3 VFB | Feedback input | Sets switching regulator output via resistor divider; detects open/short faults. |
| 8 VSW | Switch collector | Drives external flyback/boost inductor; rated for 50 V peak with 1.6 V saturation at 1.2 A. |
| 13 VCHG | Voltage tripler output | Delivers ~VER+8 V for high-side FET gate drive; clamped at 40 V maximum. |
| 18 NERD | No energy reserve detected | Open-drain output indicating VER presence (low = VER connected, high = absent or <1.5 V). |
| 19 RESETB | Active-low reset | Asserts low when VOUT falls below 4.5 V; releases after 6.25–11 ms power-on delay. |
| 20 VOUT | Linear regulator output | 5.0 V ±2% supply for microcontroller; requires ≥3.3 μF output capacitor with 100 mΩ–1 Ω ESR. |
Key Features
| Feature | Design Value |
|---|---|
| Smart Switchover Logic | Automatically shifts linear regulator supply from VBAT to VER at 6.5–8.0 V threshold, minimizing heat and enabling reserve-powered operation. |
| Integrated Voltage Tripler | Generates VCHG ≈ VER + 8.0 V using internal charge pump - eliminates discrete tripler IC and associated timing components. |
| Dual-Mode RESETB | Provides both POR delay (6.25–11 ms) and brownout reset with programmable hysteresis (25–200 mV) for robust MCU sequencing. |
| NERD Energy Reserve Status | Direct logic-level reporting of VER connection state - simplifies microcontroller firmware verification of backup power readiness. |
| Transient-Robust Linear Regulator | Maintains regulation during 50 V load-dump events without dropout or shutdown - critical for airbag deployment continuity. |
Applications
| Automotive Airbag Control Unit | Passive Safety System Power Management |
|---|---|
|
Use Scenario: Primary power management in electronic control units (ECUs) for driver/passenger airbag deployment systems. IC Role / Device Role / Timing Role: ASIC-level power hub providing regulated 5 V for MCU, tripler voltage for squib drivers, and RESET/NERD signaling for system health monitoring. Use Value: Enables single-chip solution for dual-supply redundancy, eliminating discrete LDO + boost + supervisor ICs and reducing BOM count by ≥3 components. |
Use Scenario: Power conditioning and fault-aware sequencing in seatbelt pretensioner and side-impact sensor modules. IC Role / Device Role / Timing Role: Supplies stable VOUT while monitoring VER integrity and asserting RESETB only after full regulation - ensures deterministic startup before crash detection. Use Value: Guarantees <11 ms power-on delay and <200 mV reset hysteresis, meeting ISO 26262 ASIL-B timing requirements for passive safety functions. |
| Energy Reserve Backup Systems | High-Voltage Gate Driver Supply |
|
Use Scenario: Maintaining MCU and sensor operation during battery disconnect or cranking events in ADAS-integrated airbag ECUs. IC Role / Device Role / Timing Role: Smart switch monitors VBAT and automatically engages VER path within microseconds, sustaining VOUT without interruption. Use Value: Achieves zero-downtime switchover and eliminates need for external OR-ing diodes or ideal diode controllers. |
Use Scenario: Generating gate drive voltage for high-side MOSFETs controlling squib firing circuits. IC Role / Device Role / Timing Role: Voltage tripler converts VER (e.g., 12 V) into VCHG (~20 V) with built-in 40 V clamp - directly drives gate without external level-shifting. Use Value: Delivers 30 μA tripler output current at 14.25 V within 30 ms, supporting fast squib precharge prior to deployment command. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP380LSN3T2G | Single 3 A synchronous buck regulator; no linear regulator, no tripler, no VER switchover logic. | Supports basic 5 V rail generation only; lacks airbag-specific features (NERD, RESETB, energy reserve interface). | Use where only primary VBAT-to-5 V conversion is needed and reserve power is handled externally. |
| TPS65381AQDAGQ1 | Automotive PMIC with dual LDOs, buck, watchdog, but no integrated voltage tripler or VER-input switchover. | Targets general automotive MCUs; requires external circuitry for squib gate drive and energy reserve monitoring. | Choose when system needs multi-rail support and functional safety diagnostics beyond airbag-specific power sequencing. |
Compared with NCP380LSN3T2G and TPS65381AQDAGQ1, the CS2001YDWF20 uniquely integrates VER-aware smart switchover, a dedicated voltage tripler, and NERD/RESETB signaling - making it the only single-package solution qualified for end-to-end airbag ECU power architecture.
Availability
CS2001YDWF20 is available at Aetrix Electronics and suitable for automotive safety systems, airbag control units, and energy-reserve backup power designs requiring stable component supply across extended temperature and high-reliability automotive qualification.
Supply support for CS2001YDWF20 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CS2001YDWF20 belongs to onsemi's automotive safety power management ASIC family, designed specifically to consolidate airbag ECU power functions - including reserve-aware regulation, squib driver supply, and fault-tolerant reset - into a single AEC-Q100 qualified device.
FAQ
What is the function of the VER pin on the CS2001YDWF20?
The VER pin on the CS2001YDWF20 serves as the energy reserve input, accepting 8–25 V to power the linear regulator and voltage tripler during low-battery or battery-loss conditions. It enables automatic switchover from VBAT, triggers NERD status reporting, and feeds the tripler to generate VCHG. VER must be present and ≥1.5 V for NERD to indicate "connected" (low logic level).
How does the CS2001YDWF20 handle automotive load-dump transients?
The CS2001YDWF20 withstands 50 V peak transients (per 36 V load dump at 14 V battery) without linear regulator dropout or shutdown. Its internal protection maintains VOUT regulation and continues supplying the microcontroller, ensuring uninterrupted airbag system readiness during harsh automotive electrical events.
What is the purpose of the NERD pin on the CS2001YDWF20?
The NERD pin on the CS2001YDWF20 is a dual-function open-drain output: during power-up, it acts as a programmable POR signal (delayed by external capacitor); once VOUT is regulated, it indicates VER connection status - low = VER present and valid (>1.5 V), high = absent or invalid. This enables firmware to verify reserve power readiness before deployment.
Can the CS2001YDWF20 be used in boost or flyback topologies?
Yes, the CS2001YDWF20 supports both boost and flyback configurations via its VSW pin and internal 1.2 A switch. The topology is selected by external component layout: boost uses VSW as switch node with inductor to VOUT; flyback uses VSW as primary switch with transformer coupling. VFB feedback network sets output voltage in either mode.
What are the output capacitor requirements for the CS2001YDWF20 linear regulator?
The CS2001YDWF20 linear regulator requires a minimum 3.3 μF output capacitor with ESR between 100 mΩ and 1.0 Ω. If ESR falls below 100 mΩ, a series resistor must be added to meet stability criteria. Typical designs use 10 μF tantalum or ceramic capacitors with appropriate ESR to ensure regulation under full 100 mA load.
CS2001YDWF20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 150kHz
- Voltage/Current - Output 1:
- -, 1.2A
- Voltage/Current - Output 2:
- 5V, 100mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.9V ~ 5.1V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CS2001YDWF20 FAQ
1.How can I place an order for CS2001YDWF20 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS2001YDWF20 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 CS2001YDWF20 reliable?
The price and inventory of CS2001YDWF20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS2001YDWF20 is usually 5 days.
3.What payment methods are accepted for CS2001YDWF20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS2001YDWF20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS2001YDWF20?
CS2001YDWF20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS2001YDWF20 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 CS2001YDWF20?
For technical support, including CS2001YDWF20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS2001YDWF20 requirements.
6.How does Aetrix verify that CS2001YDWF20 is sourced from the original manufacturer or authorized distributors?
All CS2001YDWF20 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 CS2001YDWF20 meets industry standards.
7.What is the process for return or replacement of CS2001YDWF20?
All CS2001YDWF20 units undergo pre-shipment inspection (PSI). If there is an issue with CS2001YDWF20, 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 CS2001YDWF20 part is unused and in its original packaging.
Return procedure for CS2001YDWF20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CS2001YDWF20 Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
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…
