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onsemi FAN5361UMP123X
- Part No.:
- FAN5361UMP123X
- Manufacturer:
- onsemi
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
FAN5361UMP123X.pdf
- Description:
- IC REG BUCK 1.233V 600MA 6UMLP
- Quantity:
- Payment:
- Shipping:
Inventory:46,123
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Product details
Overview
FAN5361UMP123X from Fairchild Semiconductor is a 6 MHz, 600 mA synchronous buck regulator in a 6-lead 2 × 2 mm UMLP package, delivering a fixed 1.233 V output from 2.3–5.5 V input. It features 35 µA quiescent current, internal soft-start, UVLO, thermal shutdown, and forced PWM mode-optimized for space-constrained mobile power rails in smartphones and tablets.
For engineers reviewing the FAN5361UMP123X datasheet, pinout, applications, or equivalent options, key selection criteria include its 6 MHz switching frequency enabling ultra-small 470 nH inductors, PFM/PWM auto-mode transition at light loads, and verified 92% peak efficiency with ceramic output capacitors.
Technical Context
The FAN5361UMP123X uses a proprietary non-linear fixed-frequency PWM modulator with synchronous rectification, maintaining 6 MHz operation across wide VIN (2.3–5.5 V) and IOUT (0–600 mA) ranges. Its control loop is ESR-independent, enabling stable regulation with low-ESR ceramic capacitors.
It implements dual-mode operation: automatic PFM at light loads (<~50 mA) for 35 µA IQ, and seamless transition to CCM PWM at higher loads. The MODE pin supports forced PWM, external clock synchronization (×4), and Schmitt-triggered logic interface with 100 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.233 V ±2.1% (1.207–1.272 V) over 0–600 mA load and –40°C to +85°C. |
| Switching Frequency | 6 MHz nominal (5.4–6.6 MHz) in PWM mode; enables 470 nH inductor and 4.7 µF ceramic output capacitor. |
| Quiescent Current | 35 µA typical in PFM mode; maintains >80% efficiency down to 1 mA load. |
| Input Voltage Range | 2.3 V to 5.5 V-supports single-cell Li-ion, Li-poly, and USB-powered systems. |
| Peak Efficiency | 92% at 3.6 VIN/1.233 VOUT/200 mA; >85% across 10–500 mA at 3.6 VIN. |
| Thermal Protection | Thermal shutdown at 150°C junction temperature with 15°C hysteresis; UMLP package θJA = 49°C/W. |
| UVLO Threshold | Rising-edge threshold 2.25 V ±0.1 V with 150 mV hysteresis-prevents erratic startup below valid supply range. |
Pinout & Package
Package: 6-lead, 2 × 2 mm ultra-thin MLP (UMLP), 0.5 mm pitch, 0.6 mm max height, exposed thermal pad (GND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 4) | Power Input | Accepts 2.3–5.5 V supply; requires local 2.2 µF ceramic decoupling to GND. |
| GND (Pin 6) | Power & Signal Ground | Common reference for all signals; connects to thermal pad for heat dissipation. |
| EN (Pin 5) | Enable Control | Active-high logic: <0.4 V = shutdown (<1 µA ISD), >1.2 V = enabled; 1 kΩ series resistor recommended if VIN >4.5 V. |
| FB (Pin 3) | Feedback Node | Direct connection to regulated 1.233 V output; no external resistor divider required. |
| SW (Pin 1) | Switching Node | Connects to inductor; carries high di/dt pulses-requires short, low-inductance layout path. |
| MODE (Pin 2) | Mode Control / Sync Input | Logic 0 = auto PFM/PWM; Logic 1 = forced PWM; square wave input synchronizes fSW to 4× fMODE. |
Key Features
| Feature | Design Value |
|---|---|
| 6 MHz Fixed-Frequency Operation | Enables use of sub-500 nH inductors and 4.7 µF X5R ceramic capacitors-reducing solution size by >40% vs. 1–2 MHz buck regulators. |
| PFM/PWM Auto-Transition | Seamless mode switching with <18 mV VOUT glitch; preserves fast transient response while achieving 35 µA IQ at light loads. |
| Internal Soft-Start | Fixed slew rate (50 mV/µs to 1 VOUT, then 12.5 mV/µs) prevents inrush current-eliminates need for external soft-start circuitry. |
| Synchronous Rectification | Integrated PMOS/NMOS power stage (RDS(on) = 350 mΩ / 225 mΩ) eliminates external diode-improves efficiency and thermal performance. |
| Robust Protection Suite | Includes cycle-by-cycle current limit (900–1250 mA), thermal shutdown (150°C), UVLO (2.25 V), and 85 µs fault recovery-ensures reliable operation under overload or short-circuit. |
Applications
| Smartphone Core Rail | Tablet GPU Power |
|---|---|
Use Scenario: Powering ARM Cortex-A series application processor cores requiring tightly regulated 1.23 V at up to 600 mA with dynamic DVFS scaling. IC Role / Device Role / Timing Role: Primary step-down DC/DC converter supplying core voltage domain; operates in auto PFM/PWM to minimize idle power during screen-off states. Use Value: 35 µA quiescent current extends battery life in standby; 6 MHz switching enables compact 0201-size inductor placement near SoC. | Use Scenario: Delivering clean, low-noise 1.233 V to GPU subsystems in Android tablets during burst rendering workloads. IC Role / Device Role / Timing Role: High-transient-response buck regulator handling rapid 0→400 mA load steps with <20 mV undershoot/overshoot. Use Value: Best-in-class load transient response (Fig. 26–29) and 92% peak efficiency reduce thermal stress on GPU die and PCB. |
| Wi-Fi/Bluetooth SoC Supply | Ultra-Mobile PC Memory Rail |
Use Scenario: Powering integrated Wi-Fi 6/Bluetooth 5.2 combo chips in thin-and-light notebooks where board area and thermal headroom are constrained. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator with forced PWM mode enabled via MODE pin to suppress switching noise near RF receivers. Use Value: External clock synchronization (4× fMODE) allows alignment of switching edges away from sensitive RF bands-reducing conducted EMI. | Use Scenario: Supplying DDR3L/LPDDR4 memory interfaces in fanless UMPCs requiring stable 1.233 V with minimal output ripple. IC Role / Device Role / Timing Role: Low-ripple PFM/PWM buck converter operating in forced PWM mode during active memory access to maintain tight VOUT regulation. Use Value: 1.233 V accuracy (±2.1%) and <15 mVpp ripple (Fig. 13) ensure signal integrity and timing margin compliance for high-speed memory buses. |
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 | Fixed 1.2 V output (not 1.233 V); 3–6 MHz DVS-capable frequency; 2.05–6.0 V input; 600 mA rating. | Requires external feedback resistors for 1.233 V; lacks MODE pin sync capability; lower IQ (18 µA) but no PFM/PWM auto-transition. | Choose when exact 1.233 V is not required and lowest possible quiescent current dominates. |
| RT8059NGSP | Adjustable output (0.6–5.5 V); 2.5–5.5 V input; 600 mA; 2.5 MHz switching; no PFM mode-PWM-only operation. | Requires external resistor divider; higher output ripple due to lower switching frequency; no light-load efficiency optimization. | Choose when adjustable output voltage and simpler control interface outweigh need for ultra-low IQ and high-frequency operation. |
Compared with TPS62231DRYR and RT8059NGSP, the FAN5361UMP123X delivers tighter output voltage accuracy (±2.1% at 1.233 V), superior light-load efficiency via PFM, and 6 MHz operation enabling smaller passives-making it optimal for space- and battery-life-sensitive mobile SoC rails.
Availability
FAN5361UMP123X is available at Aetrix Electronics and suitable for smartphone core rails, tablet GPU supplies, Wi-Fi/Bluetooth SoC power, and ultra-mobile PC memory rails requiring stable component supply with guaranteed long-term availability.
Supply support for FAN5361UMP123X 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
Fairchild Semiconductor was a leading designer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016; its legacy power management portfolio remains widely deployed in mobile and portable electronics.
The FAN5361 series was developed specifically for ultra-compact, high-efficiency point-of-load conversion in battery-powered handheld devices-emphasizing minimal footprint, low IQ, and robust transient response.
FAQ
What is the output voltage tolerance of the FAN5361UMP123X over temperature and load?
The FAN5361UMP123X provides a fixed 1.233 V output with ±2.1% tolerance (1.207–1.272 V) across full load (0–600 mA) and operating temperature (–40°C to +85°C), as specified in the Electrical Characteristics table under VO parameter conditions for the 1.233 V option.
Does the FAN5361UMP123X require external feedback resistors to set its output voltage?
No, the FAN5361UMP123X does not require external feedback resistors. It is a fixed-output device with an internally trimmed 1.233 V reference connected directly to the FB pin, which must be tied to the regulated output node per the Typical Application schematic.
How does the MODE pin function on the FAN5361UMP123X?
The MODE pin on the FAN5361UMP123X serves three functions: logic 0 enables automatic PFM/PWM transition; logic 1 forces continuous PWM operation; and a square-wave input synchronizes the switching frequency to four times the input frequency-enabling EMI reduction through clock alignment.
What is the minimum input voltage required for the FAN5361UMP123X to maintain 6 MHz operation across full load?
The FAN5361UMP123X maintains 6 MHz PWM operation down to VIN ≥ 2.9 V at full 600 mA load for the 1.233 V output. Below 2.9 V, switching frequency drops due to tOFF(MIN) limitation, as shown in Figure 15 of the datasheet.
Can the FAN5361UMP123X safely start into a large output capacitor (e.g., >10 µF)?
Startup into large COUT (>10 µF) is possible but requires careful design: Table 1 specifies minimum RLOAD values to avoid current-limit shutdown during soft-start. For COUT >15 µF, multiple soft-start cycles may occur due to displacement current exceeding ILIM(OL), necessitating light initial load or staged enable sequencing.
FAN5361UMP123X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Bulk
- 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):
- 1.233V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UMLP (2x2)
FAN5361UMP123X FAQ
1.How can I place an order for FAN5361UMP123X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN5361UMP123X 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 FAN5361UMP123X reliable?
The price and inventory of FAN5361UMP123X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN5361UMP123X is usually 5 days.
3.What payment methods are accepted for FAN5361UMP123X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN5361UMP123X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN5361UMP123X?
FAN5361UMP123X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN5361UMP123X 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 FAN5361UMP123X?
For technical support, including FAN5361UMP123X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN5361UMP123X requirements.
6.How does Aetrix verify that FAN5361UMP123X is sourced from the original manufacturer or authorized distributors?
All FAN5361UMP123X 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 FAN5361UMP123X meets industry standards.
7.What is the process for return or replacement of FAN5361UMP123X?
All FAN5361UMP123X units undergo pre-shipment inspection (PSI). If there is an issue with FAN5361UMP123X, 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 FAN5361UMP123X part is unused and in its original packaging.
Return procedure for FAN5361UMP123X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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