My Inquiry
My Account
onsemi FAN53611AUC11X
- Part No.:
- FAN53611AUC11X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53611AUC11X.pdf
- Description:
- IC REG BUCK 1.1V 1A 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,819
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN53611AUC11X from onsemi is a 1 A, 1.100 V fixed-output synchronous buck regulator operating at 6 MHz with 24 µA quiescent current, 2.3–5.5 V input range, and integrated PMOS/NMOS power switches (175 mΩ/165 mΩ RDS(on)). It delivers peak efficiency of 92% in mobile power management for baseband processors and RF modules.
For engineers reviewing the FAN53611AUC11X datasheet, pinout, applications, or equivalent options, key selection criteria include light-load PFM mode operation, forced PWM capability via MODE pin, external clock synchronization up to 1.7 MHz, thermal shutdown at 150°C, and active output discharge (230 Ω path).
Technical Context
The FAN53611AUC11X employs a proprietary non-linear fixed-frequency PWM modulator with seamless PFM/PWM transition, enabling best-in-class load transient response while maintaining 6 MHz switching across 2.3–5.5 V input and 0–1 A load. Its architecture eliminates ESR dependency, supporting ceramic output capacitors.
Control logic integrates internal soft-start (180–300 µs), UVLO (2.27 V threshold, 200 mV hysteresis), cycle-by-cycle current limiting (1750 mA typical open-loop limit), and hiccup-mode fault recovery after 16 current-limit cycles. The MODE pin enables PWM-only operation or external clock sync at ×4 multiplication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.100 V ±4.7% over 0–1 A load and –40°C to +85°C ambient |
| Max Output Current | 1 A continuous; peak current limit 1750 mA (typical, open-loop) |
| Switching Frequency | 6 MHz nominal fixed frequency; supports external sync from 1.3–1.7 MHz on MODE pin |
| Quiescent Current | 24 µA typical in PFM mode; drops to 0.25 µA in shutdown |
| Input Voltage Range | 2.3 V to 5.5 V; UVLO activates below 2.27 V with 200 mV hysteresis |
| Efficiency | 92% peak at 1 A; >80% maintained down to 1 mA load |
| Thermal Protection | Thermal shutdown at 150°C junction temperature with 15°C hysteresis |
Pinout & Package
Package: 6-bump Wafer-Level Chip-Scale Package (WLCSP), 0.4 mm pitch, 1.160 mm × 0.860 mm footprint, 547–625 µm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Logic-controlled mode select: high = forced PWM; low = auto PFM/PWM; also accepts sync clock (×4 multiplication) |
| B1 | SW | Switching node connecting to inductor; carries high di/dt pulsed current |
| C1 | FB | Feedback input tied directly to output; sets regulated voltage via internal 1.100 V reference |
| C2 | GND | Power and signal ground reference; must be low-impedance connection to PCB plane |
| B2 | EN | Enable input: >1.2 V enables regulation; <0.4 V forces shutdown (<1 µA ISD) |
| A2 | VIN | Main input supply (2.3–5.5 V); powers internal circuitry and high-side switch |
Key Features
| Feature | Design Value |
|---|---|
| Low-Ripple Light-Load Operation | PFM mode maintains 24 µA IQ while delivering excellent transient response - critical for always-on mobile subsystems |
| External Clock Synchronization | MODE pin accepts 1.3–1.7 MHz square wave to lock fSW at 5.2–6.8 MHz, eliminating beat frequencies in multi-rail systems |
| Integrated Output Discharge | 230 Ω internal FET discharges FB to GND during shutdown - prevents floating output and ensures clean power sequencing |
| Robust Fault Protection | Cycle-by-cycle current limiting + thermal shutdown + hiccup-mode restart protects against short-circuit and overload without latch-up |
| Ultra-Small Footprint | 0.4 mm pitch WLCSP occupies <1 mm² PCB area - ideal for space-constrained portable designs like data cards and ultra-mobile PCs |
Applications
| Baseband Processor Core Supply | RF Power Amplifier Bias Rail |
|---|---|
Use Scenario: Powers ARM-based application processors in LTE/WiFi data cards requiring fast dynamic voltage scaling and low-noise 1.1 V core rail. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 1.100 V at up to 1 A with sub-µs transient response to processor DVFS events. Use Value: 92% peak efficiency and 24 µA quiescent current extend battery life; 6 MHz switching allows 470 nH inductor and 4.7 µF ceramic capacitor. |
Use Scenario: Supplies bias voltage to PA stages in 4G/LTE front-end modules where ripple-sensitive analog performance demands tight regulation. IC Role / Device Role / Timing Role: Low-noise, high-PSRR point-of-load regulator synchronized to system clock to avoid interference in RF bands. Use Value: Forced PWM mode eliminates PFM noise; 6 MHz operation pushes switching harmonics beyond 1 GHz, easing RF filtering requirements. |
| Tablet SoC I/O Domain | Ultra-Mobile PC Memory Interface |
Use Scenario: Provides stable 1.1 V to DDR I/O buffers and SerDes PHYs in compact tablets where thermal headroom is limited. IC Role / Device Role / Timing Role: High-efficiency buck regulator with thermal shutdown (150°C) and active discharge for safe hot-plug and sleep/wake transitions. Use Value: Maintains >80% efficiency at 1 mA idle current; WLCSP package enables direct placement under BGA SoC for minimal loop inductance. |
Use Scenario: Powers LPDDR4 memory termination and interface logic in fanless ultra-mobile PCs requiring zero audible noise and rapid load-step response. IC Role / Device Role / Timing Role: Synchronous buck with best-in-class load transient response (<100 ns edge) and low output ripple in PFM mode. Use Value: Seamless PFM-to-PWM transition avoids voltage droop during burst memory access; 4.7 µF COUT meets JEDEC ripple specs without bulk electrolytics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | 6 MHz, 1 A, 1.1 V fixed; 17 µA IQ; no MODE pin sync; 2.05–6 V input | Lacks external clock sync and active discharge; higher min input voltage limits use with 2.3 V sources | Select when lowest quiescent current is prioritized and sync is unnecessary |
| RT8059ZSP | 6 MHz, 1 A, adjustable (0.6–3.3 V); 25 µA IQ; no PFM/PWM auto-switch; 2.5–5.5 V input | Requires external feedback resistors; no auto PFM mode; lacks thermal hysteresis spec | Select when output voltage flexibility outweighs fixed-voltage simplicity and thermal robustness |
Compared with TPS62260DRVR and RT8059ZSP, the FAN53611AUC11X uniquely combines fixed 1.100 V output, 2.3 V minimum input, MODE-pin clock sync, and guaranteed active discharge - making it optimal for space-constrained, battery-powered RF and mobile SoC applications demanding predictable startup, shutdown, and noise control.
Availability
FAN53611AUC11X is available at Aetrix Electronics and suitable for mobile data cards, tablet SoC power domains, and ultra-mobile PC memory interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for FAN53611AUC11X 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, and mobile markets.
The FAN53611AUC11X belongs to onsemi's high-frequency synchronous buck regulator product line, designed specifically for compact, battery-powered portable electronics requiring ultra-small footprint, high light-load efficiency, and robust transient performance.
FAQ
What is the output voltage tolerance of the FAN53611AUC11X over full load and temperature?
The FAN53611AUC11X delivers 1.100 V with ±4.7% accuracy (1.054 V to 1.147 V) across 0–1 A load and –40°C to +85°C ambient temperature in PWM mode. At light loads in PFM mode, output remains within ±3.6% (1.061 V to 1.140 V). This is verified per Electrical Characteristics Table on page 4 of the official datasheet.
Does the FAN53611AUC11X support external clock synchronization, and what is the valid frequency range?
Yes, the FAN53611AUC11X supports external clock synchronization via the MODE pin. A square wave input between 1.3 MHz and 1.7 MHz is accepted, and the internal switching frequency locks to four times that value (5.2–6.8 MHz). This feature is explicitly specified in the Electrical Characteristics table under "fSYNC" on page 4.
What is the purpose of the active output discharge function in the FAN53611AUC11X, and how is it implemented?
The FAN53611AUC11X includes an internal 230 Ω discharge FET between FB and GND that activates automatically when EN is pulled low. This safely discharges the output capacitor during shutdown, preventing floating voltages and ensuring clean power sequencing in multi-rail systems. This behavior is confirmed in the Pin Definitions and Electrical Characteristics sections (RDIS = 230 Ω).
How does the FAN53611AUC11X handle thermal overload, and what is its shutdown/restart behavior?
The FAN53611AUC11X triggers thermal shutdown at 150°C junction temperature with 15°C hysteresis (restarts at ~135°C). During overload, switching halts until die temperature falls sufficiently. This protection is independent of current limit and is documented in the Thermal Shutdown section (page 12) and Electrical Characteristics (TTSD = 150°C).
Can the FAN53611AUC11X operate with input voltage below 2.3 V, and what happens near the UVLO threshold?
No - the FAN53611AUC11X requires VIN ≥ 2.3 V for guaranteed operation. Its UVLO rising threshold is 2.27 V (min 2.15 V), with 200 mV hysteresis. Below this, the device remains disabled; attempting operation near 2.3 V may cause erratic startup or failure to regulate. This is defined in Absolute Maximum Ratings and Recommended Operating Conditions (page 3).
FAN53611AUC11X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.1V
- 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)
FAN53611AUC11X FAQ
1.How can I place an order for FAN53611AUC11X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53611AUC11X 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 FAN53611AUC11X reliable?
The price and inventory of FAN53611AUC11X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53611AUC11X is usually 5 days.
3.What payment methods are accepted for FAN53611AUC11X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53611AUC11X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53611AUC11X?
FAN53611AUC11X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53611AUC11X 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 FAN53611AUC11X?
For technical support, including FAN53611AUC11X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53611AUC11X requirements.
6.How does Aetrix verify that FAN53611AUC11X is sourced from the original manufacturer or authorized distributors?
All FAN53611AUC11X 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 FAN53611AUC11X meets industry standards.
7.What is the process for return or replacement of FAN53611AUC11X?
All FAN53611AUC11X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53611AUC11X, 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 FAN53611AUC11X part is unused and in its original packaging.
Return procedure for FAN53611AUC11X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN53611AUC11X 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…
