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onsemi FAN53202UC23X
- Part No.:
- FAN53202UC23X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN53202UC23X.pdf
- Description:
- IC REG BUCK PROG 5A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,843
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Product details
Overview
FAN53202UC23X from onsemi (formerly Fairchild Semiconductor) is a digitally programmable synchronous step-down DC-DC regulator delivering up to 5 A continuous output current at 2.4 MHz fixed switching frequency, with I²C interface for dynamic voltage control between 0.6 V and 1.3875 V in 12.5 mV steps, optimized for powering ARM™, Krait™, and OMAP™ application processors in smartphones and tablets.
For engineers reviewing the FAN53202UC23X datasheet, pinout, applications, or equivalent options, key selection considerations include its 20-bump WLCSP package, 2.5–5.5 V input range, PFM/PWM auto-mode operation with 60 µA quiescent current, 7 A pulse capability, and integrated soft-start and thermal shutdown protection.
Technical Context
The FAN53202UC23X employs a proprietary non-linear, fixed-frequency PWM modulator with synchronous rectification to achieve fast load transient response while maintaining constant 2.4 MHz operation across input voltages (2.5–5.5 V) and loads (0–5 A). Its architecture eliminates ESR dependency, enabling stable operation with low-ESR ceramic output capacitors.
It integrates an I²C-compatible interface supporting up to 3.4 Mbps (Fast-Plus Mode), allowing real-time reprogramming of output voltage, slew rate (eight selectable values from 0.625 to 80 mV/µs), PFM enable/disable, and software-controlled enable/disable via BUCK_EN bits - all while retaining hardware EN pin control and dual VSEL register banks for voltage bank switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous; supports 7 A for 500 ms pulses - enables short-term CPU burst power without external boost stages. |
| Switching Frequency | 2.4 MHz nominal (2.05–2.75 MHz range); allows use of compact 330 nH inductors and ≤22 µF ceramic output capacitors. |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with single-cell Li-ion, Li-polymer, and USB-powered systems. |
| Output Voltage Range | 0.6 V to 1.3875 V in 12.5 mV steps via I²C or VSEL pin selection - matches core voltage requirements of modern mobile SoCs. |
| Quiescent Current | 60 µA typical in PFM mode; maintains high light-load efficiency down to 10 mA while preserving fast transient response. |
| I²C Interface Speed | Up to 3.4 Mbps (Fast-Plus Mode); enables rapid voltage scaling during DVFS transitions without bus contention. |
| Package | 20-bump Wafer-Level Chip Scale Package (WLCSP), 1.6 × 2.0 mm - ultra-compact footprint for space-constrained mobile PCBs. |
Pinout & Package
Package: 20-bump WLCSP (1.6 mm × 2.0 mm, 0.4 mm pitch), bottom-side solder bumps, no exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (D1, D2, E1, E2) | Power Input | Primary input supply connection; must be decoupled locally with ≥10 µF ceramic capacitor referenced to GND pins. |
| GND (B2, B3, C1–C4) | Power Ground | Low-side MOSFET reference and return path for input/output capacitors; requires minimal trace length to minimize noise coupling. |
| AGND (B4) | Analog Ground | Reference for internal analog circuits and feedback; isolated from high dV/dt switching currents to preserve regulation accuracy. |
| SW (D3, D4, E3, E4) | Switching Node | Connection to external inductor; carries high di/dt square wave - must be routed short and away from sensitive analog traces. |
| VOUT (A4) | Output Sense | Direct connection to output capacitor; used for closed-loop regulation - not a power output pin but a precision feedback node. |
| EN (A2) | Hardware Enable | Active-high logic input; pulls device into <1 µA shutdown when LOW; resets all registers to defaults on assertion. |
| VSEL (A1) | Voltage Bank Select | Logic-level input selecting between VSEL0 (LOW) and VSEL1 (HIGH) register banks - enables dual-voltage configuration without I²C traffic. |
| SCL (A3) | I²C Clock Input | Master-generated clock signal; supports up to 3.4 Mbps - requires pull-up to VDD per I²C specification. |
| SDA (B1) | I²C Data Bidirectional | Open-drain bidirectional data line; used for read/write access to 6-register map including VSEL, CONTROL, and MONITOR. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally programmable output voltage | 0.6–1.3875 V in precise 12.5 mV steps via I²C or VSEL pin - enables fine-grained DVFS for ARM/Krait processors without external DACs. |
| Auto-mode PFM/PWM transition | Seamless switching between 60 µA PFM (light load) and 2.4 MHz PWM (heavy load) - sustains >80% efficiency from 10 mA to 5 A. |
| Programmable positive slew rate | Eight discrete settings (0.625–80 mV/µs) via CONTROL register - prevents overshoot during voltage ramp-up and meets SoC AVS timing constraints. |
| Integrated soft-start | 340 µs ramp time to 95% of target VOUT (e.g., 1.15 V) with 50 Ω load - limits inrush current and avoids input rail collapse during power-up. |
| Robust protection suite | Includes input UVLO (2.45 V threshold), overvoltage lockout (~6.2 V), thermal shutdown (150°C), and cycle-by-cycle current limiting (10 A peak). |
Applications
| Smartphone Application Processor Power | Tablet GPU Core Supply |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores in flagship smartphones requiring dynamic voltage scaling across performance states. IC Role / Device Role / Timing Role: Primary core voltage regulator with I²C-controlled VOUT adjustment synchronized to CPU frequency changes. Use Value: Enables sub-100 µA quiescent current in idle states while delivering 5 A bursts during camera capture or gaming - extending battery life without sacrificing responsiveness. |
Use Scenario: Supplies GPU voltage rails in Android tablets where thermal headroom and board area are tightly constrained. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 2.4 MHz to minimize inductor size and avoid audible noise in audio-sensitive zones. Use Value: 1.6 × 2.0 mm WLCSP footprint saves >40% board area versus QFN alternatives; 22 µF max COUT simplifies layout and reduces BOM count. |
| Ultra-Mobile PC SoC Core Rail | Hard Disk Drive Motor Controller Bias |
|
Use Scenario: Delivers regulated core voltage to Intel Atom or Qualcomm Snapdragon SoCs in fanless UMPCs with strict thermal budgets. IC Role / Device Role / Timing Role: Digitally programmable regulator supporting multiple VSEL voltage banks for different operational modes (e.g., active vs. connected standby). Use Value: Dual VSEL register banks allow instant voltage switching via GPIO toggle - eliminating I²C transaction latency during low-power state transitions. |
Use Scenario: Provides stable, low-noise bias supply to HDD motor driver ICs during spin-up and seek operations. IC Role / Device Role / Timing Role: High-transient-response buck regulator handling 0.1 A ↔ 1.2 A load steps with ±40 mV deviation. Use Value: Best-in-class load transient performance ensures motor controller stability during rapid acceleration/deceleration - preventing data corruption or retry errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally programmable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 4 A max output, 1.8–5.5 V input, I²C interface, 2.2 MHz switching, 16-pin WQFN (2.0 × 2.0 mm) | Lacks VSEL pin for hardware voltage bank switching; requires full I²C transaction for every VOUT change | Preferred when board space allows larger package and system firmware handles all voltage sequencing via I²C. |
| RTQ2132BGQW | 5 A output, 2.7–5.5 V input, I²C interface, 2.2 MHz, 20-pin QFN (3.0 × 3.0 mm), includes PMBus support | Higher minimum input voltage (2.7 V) excludes single-cell Li-ion below 3.0 V; larger footprint increases PCB area by 2.8× | Chosen when PMBus telemetry (temperature, current, fault logs) is required for industrial or enterprise storage applications. |
Compared with TPS628641RQYR and RTQ2132BGQW, the FAN53202UC23X uniquely combines 5 A capability, 2.4 MHz operation, VSEL hardware bank select, and 1.6 × 2.0 mm WLCSP - making it optimal for space- and efficiency-critical mobile SoC core supplies where rapid voltage transitions and minimal footprint are mandatory.
Availability
FAN53202UC23X is available at Aetrix Electronics and suitable for smartphone processor power, tablet GPU supplies, and ultra-mobile PC SoC core rails requiring stable component supply, long-term lifecycle assurance, and wafer-level packaging compatibility with fine-pitch assembly processes.
Supply support for FAN53202UC23X 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 Fairchild Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and mobile markets.
The FAN53202UC23X belongs to the TinyBuck® family of high-frequency, digitally programmable DC-DC regulators designed specifically for dynamic voltage scaling in portable computing and mobile SoC applications.
FAQ
What is the default output voltage of the FAN53202UC23X at power-up?
The FAN53202UC23X powers up with VOUT set to 1.15 V, as specified in the Ordering Information table for part number FAN53202UC23X. This value corresponds to the default NSELx register setting in VSEL0 and is active when the VSEL pin is held LOW during startup. The device retains this voltage until modified via I²C or VSEL pin toggling.
Does the FAN53202UC23X support forced PWM mode, and how is it enabled?
Yes, the FAN53202UC23X supports forced PWM mode to eliminate frequency variation under light loads. It is enabled by setting the MODE bit (bit 6) HIGH in either the VSEL0 or VSEL1 register via I²C. When MODE = 1, the regulator operates continuously at 2.4 MHz regardless of load current, eliminating PFM-related output ripple and simplifying EMI filtering.
What is the maximum recommended output capacitance for reliable soft-start of the FAN53202UC23X?
The maximum recommended output capacitance for reliable soft-start of the FAN53202UC23X is calculated using Equation (1) from the datasheet: COUTMAX ≈ (ILOAD × 320 µF)/VOUT. For example, with a 1.15 V output and 2 A soft-start load, COUTMAX ≈ 556 µF. Exceeding this limit may cause failure to reach regulation due to excessive soft-start time or current-limit cycling.
How does the FAN53202UC23X handle high-to-low output voltage transitions?
During high-to-low output voltage transitions, the FAN53202UC23X stops switching and relies on the output load to discharge VOUT to the new setpoint. No active discharge circuitry is engaged unless the OUTPUT_DISCHARGE bit (bit 7 of CONTROL register) is set HIGH - in which case an internal pull-down resistor connects VOUT to GND upon shutdown or disable events.
What I²C slave address is used by the FAN53202UC23X, and is it configurable?
The FAN53202UC23X uses a fixed 7-bit I²C slave address of 0xC0 (1100000b), with the R/W bit appended as LSB. While the default address is hard-coded, alternative addresses can be assigned through custom configuration - contact onsemi technical support or a Fairchild representative for implementation details and qualification requirements.
FAN53202UC23X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBuck®
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 1.39V
- Current - Output:
- 5A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP (1.96x1.56)
FAN53202UC23X FAQ
1.How can I place an order for FAN53202UC23X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53202UC23X 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 FAN53202UC23X reliable?
The price and inventory of FAN53202UC23X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53202UC23X is usually 5 days.
3.What payment methods are accepted for FAN53202UC23X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53202UC23X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53202UC23X?
FAN53202UC23X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53202UC23X 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 FAN53202UC23X?
For technical support, including FAN53202UC23X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53202UC23X requirements.
6.How does Aetrix verify that FAN53202UC23X is sourced from the original manufacturer or authorized distributors?
All FAN53202UC23X 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 FAN53202UC23X meets industry standards.
7.What is the process for return or replacement of FAN53202UC23X?
All FAN53202UC23X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53202UC23X, 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 FAN53202UC23X part is unused and in its original packaging.
Return procedure for FAN53202UC23X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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