My Inquiry
My Account
onsemi FAN53611AUC18X
- Part No.:
- FAN53611AUC18X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53611AUC18X.pdf
- Description:
- IC REG BUCK 1.8V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,343
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN53611AUC18X from onsemi is a 6 MHz, 1 A synchronous buck regulator in WLCSP-6 package delivering a fixed 1.800 V output from 2.3–5.5 V input. It features 24 µA quiescent current in PFM mode, internal soft-start, UVLO, thermal shutdown, and optional active output discharge-optimized for space-constrained mobile power rails in tablets and data cards.
For engineers reviewing the FAN53611AUC18X datasheet, pinout, applications, or equivalent options, key selection criteria include its 1 A output capability at 1.800 V, 6 MHz fixed-frequency operation enabling ultra-small 470 nH inductors and 4.7 µF capacitors, and seamless AUTO/PWM/external sync mode control via the MODE pin.
Technical Context
The FAN53611AUC18X employs a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, maintaining 6 MHz switching across wide VIN (2.3–5.5 V) and IOUT (0–1 A) ranges while independent of output capacitor ESR. Its architecture supports Discontinuous Conduction Mode (DCM) PFM at light loads and transitions seamlessly to continuous conduction mode (CCM) PWM under higher loads.
Control is managed through three critical pins: EN enables/disables regulation with ~250 nA shutdown current; MODE selects AUTO (PFM/PWM auto-switching), forced PWM, or external clock synchronization at 1.3–1.7 MHz (×4 output); FB provides resistive feedback for voltage regulation-though FAN53611AUC18X uses internal 1.800 V reference, eliminating external resistor network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.800 V ±3.8% (1.732–1.868 V) over 0–1 A load and −40°C to +85°C ambient. |
| Max Output Current | 1 A continuous; peak current limit 1.5–2.0 A (open-loop test condition) with hiccup-mode fault recovery. |
| Switching Frequency | 6 MHz nominal in PWM mode; supports external sync up to 1.7 MHz on MODE pin (×4 output). |
| Quiescent Current | 24 µA typical in PFM mode; 8 mA in forced PWM; <1 µA in shutdown (EN = GND). |
| Input Voltage Range | 2.3 V to 5.5 V operating; absolute max 7.0 V; UVLO threshold 2.27 V (rising), 200 mV hysteresis. |
| Efficiency | Peak 92% at 1 A; >80% maintained down to 1 mA load-enabling high efficiency across full dynamic range. |
| Thermal Protection | Thermal shutdown at 150°C junction temperature with 15°C hysteresis; θJA = 125°C/W on 4-layer JEDEC board. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP-6), 0.4 mm pitch, 1.16 × 0.86 mm footprint, 547–625 µm height. Bumps face down in standard mounting orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Mode control: logic high forces PWM; logic low enables AUTO (PFM/PWM switching); also accepts sync clock (1.3–1.7 MHz) for ×4 frequency locking. |
| B1 | SW | Switching node: connects directly to inductor; carries high di/dt pulsed current; requires low-inductance layout to minimize ringing. |
| C1 | FB | Feedback input: internally tied to 1.800 V reference-no external resistors required; senses regulated output voltage. |
| C2 | GND | Power and signal ground: primary return path for SW, VIN, and internal circuits; must connect to solid ground plane under IC. |
| B2 | EN | Enable input: active-high; device enabled when >1.2 V, shutdown when <0.4 V; draws <1 µA in shutdown state. |
| A2 | VIN | Input supply: accepts 2.3–5.5 V; requires local 2.2 µF ceramic capacitor placed within 2 mm of pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high switching frequency | 6 MHz operation reduces required inductor size to 470 nH and output capacitance to 4.7 µF-cutting solution footprint by >50% vs. 1–2 MHz buck regulators. |
| Hybrid PFM/PWM control | Auto-switching between low-quiescent 24 µA PFM (light load) and fixed-frequency 6 MHz PWM (medium/heavy load) preserves efficiency across 1 mA–1 A range. |
| Integrated active discharge | 230 Ω internal pull-down on FB when EN = GND ensures rapid output discharge-critical for sequencing in multi-rail systems and preventing back-powering. |
| Robust protection suite | Includes cycle-by-cycle current limiting, thermal shutdown (150°C), UVLO (2.27 V), and hiccup-mode fault recovery-enabling reliable operation under overload or short-circuit. |
| ESR-independent stability | Proprietary control loop eliminates dependence on output capacitor ESR, allowing use of low-ESR ceramic capacitors without phase compensation redesign. |
Applications
| Mobile Data Card Power | Tablet Core Logic Rail |
|---|---|
|
Use Scenario: Powering baseband processor, RF transceiver, and memory interfaces in LTE/WiFi data cards with tight PCB area constraints and aggressive battery life targets. IC Role / Device Role / Timing Role: Primary 1.8 V core supply delivering up to 1 A with fast transient response to handle burst-mode cellular transmission. Use Value: 6 MHz switching enables 0402-sized 4.7 µF output capacitor and 0603 470 nH inductor-reducing total solution area to <3 mm² while sustaining >90% efficiency at 500 mA. |
Use Scenario: Supplying application processor I/O or GPU voltage domains in thin-profile tablets where thermal headroom and standby current are critical. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting dynamic voltage scaling (DVS) with sub-1 µA shutdown current and 180–300 µs soft-start. Use Value: 24 µA quiescent current in PFM mode extends battery runtime during display-off/idle states; thermal shutdown prevents derating in confined tablet chassis. |
| DSC/DVC Image Sensor Bias | Ultra-Mobile PC Memory Rail |
|
Use Scenario: Providing clean, low-noise 1.8 V bias to CMOS image sensors and analog front-ends in digital still/video cameras subject to rapid illumination changes. IC Role / Device Role / Timing Role: Low-ripple power source with best-in-class load transient response (<100 ns edge, ±200 mV deviation) to prevent sensor artifacts during exposure switching. Use Value: Seamless PFM-to-PWM transition and proprietary modulator architecture deliver <15 mVpp ripple at 200 mA load-eliminating need for post-regulation LDO filtering. |
Use Scenario: Delivering stable 1.8 V to DDR2/DDR3 memory subsystems in fanless ultra-mobile PCs with limited airflow and high ambient temperatures. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter supporting 1 A peak memory bursts while maintaining regulation under +85°C ambient. Use Value: 125°C/W θJA and 150°C thermal shutdown enable full 1 A operation without derating on standard 4-layer boards-reducing BOM count vs. larger-package alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.8 V fixed, 1 A, 6 MHz-but no MODE pin sync capability; only PFM/PWM auto-switching; higher IQ (32 µA) in PFM mode. | Lacks external clock synchronization and forced PWM mode; less flexible for noise-sensitive or deterministic-frequency systems. | Choose if sync functionality is unnecessary and board space allows slightly larger passive components (requires ≥680 nH inductor). |
| RT7295BGJ6F | 1.8 V fixed, 1.2 A, 2 MHz; includes enable, power-good, and thermal foldback-but lower switching frequency increases inductor/capacitor size. | Higher current rating but 2 MHz operation requires ≥1.5 µH inductor and ≥10 µF output cap-unsuitable for ultra-compact layouts. | Prefer when higher output current margin is needed and PCB area permits larger magnetics; avoid when 6 MHz size advantage is critical. |
Compared with TPS62231DRYR and RT7295BGJ6F, the FAN53611AUC18X uniquely combines 6 MHz operation, 1 A capability, and MODE-pin synchronizability in a 1.16 × 0.86 mm WLCSP-making it optimal for next-gen mobile devices where footprint, efficiency across load range, and EMI control are co-prioritized.
Availability
FAN53611AUC18X is available at Aetrix Electronics and suitable for mobile data cards, tablet core logic rails, and ultra-mobile PC memory supplies requiring stable component supply, long-term lifecycle support, and consistent wafer-lot traceability.
Supply support for FAN53611AUC18X 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, sensor, and connectivity solutions for automotive, industrial, cloud, medical, and mobile markets.
The FAN53611AUC18X belongs to onsemi's high-frequency synchronous buck regulator product line, engineered specifically for space- and efficiency-critical portable electronics-emphasizing minimal external component count, ultra-low quiescent current, and robust protection in sub-1 mm² packages.
FAQ
What is the output voltage tolerance of the FAN53611AUC18X over temperature and load?
The FAN53611AUC18X delivers a fixed 1.800 V output with ±3.8% accuracy (1.732–1.868 V) across full operating conditions: 0–1 A load, −40°C to +85°C ambient, and 2.3–5.5 V input. In PWM mode, tolerance tightens to ±2.2% (1.756–1.844 V). This specification is validated per the official onsemi datasheet Rev. 2 (December 2017) and applies directly to the FAN53611AUC18X variant.
Does the FAN53611AUC18X require external feedback resistors?
No-the FAN53611AUC18X integrates a precision 1.800 V reference and internal feedback divider, so no external resistors are needed on the FB pin. The FB pin connects directly to the output capacitor for regulation. This simplifies layout, eliminates resistor tolerance errors, and reduces bill-of-materials cost-confirmed in the "Pin Definitions" and "Electrical Characteristics" sections of the FAN53611AUC18X datasheet.
How does the MODE pin function on the FAN53611AUC18X?
The MODE pin on the FAN53611AUC18X serves three roles: (1) logic high (>1.2 V) forces fixed-frequency PWM operation; (2) logic low (<0.4 V) enables automatic PFM/PWM mode switching; (3) applying a 1.3–1.7 MHz square wave synchronizes switching to 4× that frequency. The pin includes Schmitt-trigger buffering for noise immunity-details are specified in the "Pin Definitions" and "Operation Description" of the FAN53611AUC18X datasheet.
What is the minimum recommended output capacitor for stable operation of the FAN53611AUC18X?
The FAN53611AUC18X is optimized for 4.7 µF X5R ceramic output capacitance in 0402 case size, with guaranteed stability down to 1.6 µF. Using <1.6 µF risks loop instability and excessive output ripple; exceeding 4.7 µF improves transient response and reduces ripple but adds no stability benefit. This guidance is explicitly stated in the "Recommended Operating Conditions" and "Applications Information" sections for the FAN53611AUC18X.
Is active output discharge enabled by default on the FAN53611AUC18X?
Yes-per the "Ordering Information" table in the FAN53611AUC18X datasheet, the "A" suffix (as in AUC18X) denotes inclusion of active discharge. When EN is pulled low, an internal 230 Ω switch discharges the FB node to GND, rapidly collapsing the output voltage. This feature is confirmed in the "Pin Definitions" (RDIS = 230 Ω) and "Electrical Characteristics" tables-and is absent in non-"A" variants like FAN53611UC123X.
FAN53611AUC18X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.23x0.88)
FAN53611AUC18X FAQ
1.How can I place an order for FAN53611AUC18X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53611AUC18X 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 FAN53611AUC18X reliable?
The price and inventory of FAN53611AUC18X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53611AUC18X is usually 5 days.
3.What payment methods are accepted for FAN53611AUC18X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53611AUC18X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53611AUC18X?
FAN53611AUC18X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53611AUC18X 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 FAN53611AUC18X?
For technical support, including FAN53611AUC18X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53611AUC18X requirements.
6.How does Aetrix verify that FAN53611AUC18X is sourced from the original manufacturer or authorized distributors?
All FAN53611AUC18X 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 FAN53611AUC18X meets industry standards.
7.What is the process for return or replacement of FAN53611AUC18X?
All FAN53611AUC18X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53611AUC18X, 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 FAN53611AUC18X part is unused and in its original packaging.
Return procedure for FAN53611AUC18X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN53611AUC18X Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
