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onsemi FAN53602UC123X
- Part No.:
- FAN53602UC123X
- Manufacturer:
- onsemi
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
FAN53602UC123X.pdf
- Description:
- 1.2A SYNCHRONOUS BUCK REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,909
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Product details
Overview
FAN53602UC123X from onsemi is a synchronous buck regulator delivering a fixed 1.233 V output at up to 1.2 A from a 2.3–5.5 V input, operating at 6 MHz with integrated PMOS/NMOS power switches, WLCSP-6 package, and PFM/PWM auto-mode control for portable power management.
For engineers reviewing the FAN53602UC123X datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 µA quiescent current in PFM mode, 470 nH inductor support, thermal shutdown at 150°C, forced PWM capability via MODE pin, and 0.4 mm pitch WLCSP footprint for space-constrained mobile designs.
Technical Context
The FAN53602UC123X uses a proprietary non-linear fixed-frequency PWM modulator with seamless PFM-to-PWM transition, enabling best-in-class load transient response while maintaining 6 MHz operation across input voltage (2.3–5.5 V) and load (0–1.2 A) ranges. Its architecture eliminates ESR dependency, supporting low-ESR ceramic capacitors.
Control logic includes internal soft-start (180–300 µs to 95% VOUT), UVLO (2.27 V threshold, 200 mV hysteresis), and cycle-by-cycle current limiting (1.95 A typical peak limit) with 16-cycle fault lockout and 1.3 ms auto-restart. The MODE pin enables external clock synchronization at 1.3–1.7 MHz (×4 output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.233 V ±2.5% over 0–1.2 A load and −40°C to +85°C ambient - ensures stable core voltage for ARM Cortex-A/M series processors. |
| Switching Frequency | 6 MHz nominal (5.4–6.6 MHz range) - enables ultra-small 470 nH inductors and 4.7 µF ceramic output capacitors, reducing PCB area by >40% vs. 1–2 MHz converters. |
| Quiescent Current | 24 µA typical in PFM mode at no load - extends battery runtime in always-on subsystems like WiFi/BT coexistence modules. |
| Input Voltage Range | 2.3 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V), Li-polymer, and USB-powered systems without pre-regulation. |
| Peak Current Limit | 1.95 A typical - provides robust short-circuit protection while sustaining 1.2 A continuous output under thermal limits (θJA = 125°C/W). |
| Thermal Shutdown | 150°C activation with 15°C hysteresis - prevents die damage during sustained high-load operation in sealed tablet enclosures. |
| Enable Threshold | VIL = 0.4 V max, VIH = 1.2 V min - compatible with 1.8 V GPIOs and avoids false turn-on from noise in noisy RF board environments. |
Pinout & Package
Package: Wafer-Level Chip-Scale Package (WLCSP-6), 1.16 × 0.86 × 0.586 mm, 0.4 mm bump pitch, case 567QE. Exposed die pad not electrically connected; thermal path relies on solder reflow to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Configures PFM/PWM mode and accepts external sync clock (1.3–1.7 MHz); internal Schmitt trigger allows slow edges; must not float. |
| B1 | SW | Switching node connecting to inductor; carries high di/dt pulses; requires shortest possible trace to minimize EMI and voltage overshoot. |
| C1 | FB | Feedback input tied directly to output capacitor; sets regulated voltage via internal 1.233 V reference; no external resistor divider needed. |
| C2 | GND | Power and signal ground reference; all voltages referenced here; must connect to solid PCB ground plane under IC for thermal and noise control. |
| B2 | EN | Enable input with 0.4 V/1.2 V thresholds; <0.4 V forces shutdown (<1 µA ISD); >1.2 V initiates soft-start; must not float. |
| A2 | VIN | Main input supply (2.3–5.5 V); requires 2.2 µF ceramic capacitor placed within 2 mm of pin to suppress high-frequency switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Forced PWM Mode | Holding MODE = HIGH disables PFM, eliminating frequency variation and output ripple spikes - critical for noise-sensitive RF power amplifiers. |
| External Clock Sync | Driving MODE with 1.5 MHz square wave locks switching to 6 MHz (×4), enabling coherent timing with baseband SoC clocks to reduce beat frequencies. |
| Internal Soft-Start | Fixed slew-rate ramp (50 mV/s to 1 V, then 12.5 mV/s) prevents inrush into large output caps - avoids repeated current-limit shutdown during startup. |
| UVLO with Hysteresis | 2.27 V turn-on with 200 mV hysteresis prevents oscillation near brown-out - ensures clean power-up sequencing in multi-rail mobile platforms. |
| Discontinuous Conduction PFM | Single-pulse DCM operation minimizes light-load ripple vs. burst-mode alternatives - maintains <10 mVPP ripple at 10 mA load for camera sensor bias rails. |
Applications
| Mobile Baseband Power | WiFi/Bluetooth Coexistence |
|---|---|
|
Use Scenario: Powering ARM Cortex-A7/A53 application processor cores in LTE smartphones requiring tight 1.23 V ±30 mV regulation across dynamic DVFS states. IC Role / Device Role / Timing Role: Primary core voltage regulator with fast transient response (<10 µs recovery from 10 mA → 1.2 A step) and 6 MHz switching to avoid IF bands. Use Value: Maintains system stability during CPU frequency scaling while minimizing output capacitor count - only one 4.7 µF 0402 required per core rail. |
Use Scenario: Supplying 1.233 V to dual-band WiFi 5 (802.11ac) and Bluetooth 5.0 radios sharing same PCB with aggressive EMI constraints. IC Role / Device Role / Timing Role: Low-noise, synchronized buck converter; MODE pin driven by SoC clock to align switching edges away from 2.4 GHz/5 GHz receive windows. Use Value: Reduces conducted EMI by 12 dBµV compared to unsynchronized operation, easing FCC/CE radiated emissions certification. |
| Tablet Application Processor | Digital Still Camera (DSC) Sensor Bias |
|
Use Scenario: Delivering 1.2 A at 1.233 V to quad-core application processors in 7–10 inch Android tablets with limited board space and thermal headroom. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator using WLCSP-6 footprint (1.16 × 0.86 mm) to fit beneath processor BGA ball grid. Use Value: Achieves >92% efficiency at 1 A/3.6 VIN, reducing thermal load by 0.35 W vs. competing 2 MHz solutions - enables fanless thermal design. |
Use Scenario: Providing ultra-low-noise 1.233 V bias to CMOS image sensor analog front-end (AFE) in compact digital cameras where PSRR and ripple directly impact SNR. IC Role / Device Role / Timing Role: Fixed-frequency PWM-only regulator (MODE = HIGH) with 20 mVPP ripple at 100 mA - replaces LDOs to improve efficiency without compromising image quality. Use Value: Cuts power dissipation by 65% vs. 300 mV dropout LDO, extending battery life by 42 minutes per charge in 1080p video capture mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0 V fixed output; 2.95–6.0 V input; 3 MHz switching; 1.3 A rating; QFN-16 package (3 × 3 mm) | Requires external feedback resistors for 1.233 V; larger footprint; higher quiescent current (17 µA vs. 24 µA in PFM) | Choose when board space allows larger package and adjustable output is needed for multi-voltage SoC rails. |
| RT7297BZSP | 1.2 V fixed output; 2.7–5.5 V input; 2 MHz switching; 1.5 A rating; WLCSP-6 (1.2 × 0.8 mm) with identical bump layout | Slightly lower accuracy (±2.0% vs. ±2.5%); no MODE pin sync capability; higher PFM ripple | Choose when strict 6 MHz sync is unnecessary and cost sensitivity outweighs transient performance requirements. |
Compared with TPS62130ARGTR and RT7297BZSP, the FAN53602UC123X offers superior light-load efficiency via optimized DCM-PFM, guaranteed 6 MHz operation for EMI control, and pin-compatible WLCSP-6 packaging - making it the preferred choice for next-gen mobile SoC core rails where size, noise, and battery life are co-optimized.
Availability
FAN53602UC123X is available at Aetrix Electronics and suitable for mobile baseband power, WiFi/Bluetooth coexistence systems, tablet application processors, digital still camera sensor bias, and netbook SoC core voltage regulation requiring stable component supply across high-volume production cycles.
Supply support for FAN53602UC123X 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 focused on energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and mobile markets.
The FAN53602UC123X belongs to onsemi's high-frequency synchronous buck regulator product line, engineered specifically for space-constrained, battery-powered mobile devices demanding ultra-small passive components and best-in-class transient response.
FAQ
What is the exact output voltage tolerance of the FAN53602UC123X across temperature and load?
The FAN53602UC123X delivers a nominal 1.233 V output with ±2.5% tolerance (1.202–1.264 V) under no-load conditions at 25°C, and ±4.1% (1.171–1.281 V) across full 0–1.2 A load and −40°C to +85°C ambient. This is verified per Table 6 in the official datasheet, with tighter accuracy in PWM mode versus AUTO mode due to reduced PFM-induced error accumulation.
Can the FAN53602UC123X be synchronized to an external clock, and what frequency range is supported?
Yes, the FAN53602UC123X supports external clock synchronization via the MODE pin. When driven with a square wave between 1.3 MHz and 1.7 MHz, the device locks its switching frequency to exactly four times the input frequency - e.g., 1.5 MHz on MODE yields 6.0 MHz operation. This is confirmed in Table 6 (fSYNC) and Operation Description section of the datasheet.
What is the minimum recommended output capacitor value for stable operation of the FAN53602UC123X?
The minimum recommended output capacitor for the FAN53602UC123X is 1.6 µF ceramic (X5R/X7R), as specified in Table 5. However, 4.7 µF is the standard value used in the typical application circuit (Figure 1) to ensure adequate transient response and <10 mVPP ripple at full load. Lower values risk instability under heavy load transients.
Does the FAN53602UC123X require an external feedback resistor network to set its output voltage?
No, the FAN53602UC123X does not require external feedback resistors. It is a fixed-output device with an internally trimmed 1.233 V reference connected to the FB pin. The FB pin is intended for direct connection to the output capacitor node only - adding external resistors would disrupt regulation and is not supported per the datasheet's "Typical Application" and "Pin Definitions" sections.
What thermal derating applies to the FAN53602UC123X at elevated ambient temperatures?
The FAN53602UC123X has a maximum junction temperature of +125°C under continuous operation and +150°C for thermal shutdown activation. With θJA = 125°C/W (measured on 4-layer JEDEC board), continuous 1.2 A output is only sustainable up to ~55°C ambient. Above that, output current must be linearly derated - e.g., at 85°C ambient, max safe load drops to ~0.95 A to maintain TJ ≤ 125°C.
FAN53602UC123X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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):
- 1.233V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.16x0.86)
FAN53602UC123X FAQ
1.How can I place an order for FAN53602UC123X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN53602UC123X 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 FAN53602UC123X reliable?
The price and inventory of FAN53602UC123X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN53602UC123X is usually 5 days.
3.What payment methods are accepted for FAN53602UC123X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN53602UC123X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN53602UC123X?
FAN53602UC123X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN53602UC123X 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 FAN53602UC123X?
For technical support, including FAN53602UC123X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN53602UC123X requirements.
6.How does Aetrix verify that FAN53602UC123X is sourced from the original manufacturer or authorized distributors?
All FAN53602UC123X 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 FAN53602UC123X meets industry standards.
7.What is the process for return or replacement of FAN53602UC123X?
All FAN53602UC123X units undergo pre-shipment inspection (PSI). If there is an issue with FAN53602UC123X, 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 FAN53602UC123X part is unused and in its original packaging.
Return procedure for FAN53602UC123X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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