My Inquiry
My Account
onsemi FAN48623UC315X
- Part No.:
- FAN48623UC315X
- Manufacturer:
- onsemi
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
FAN48623UC315X.pdf
- Description:
- IC REG BOOST PROG 2.5A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN48623UC315X from Fairchild Semiconductor is a 2500 mA synchronous TinyBoost® DC-DC boost regulator with true bypass mode, fixed 3.15 V / 3.33 V dual-output option, 2.5–5.5 V input range, and integrated synchronous rectifier for Li-ion battery-powered mobile RF power amplifiers and PMIC supply rails.
For engineers reviewing the FAN48623UC315X datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, package mapping, real-world load transient behavior, bypass transition thresholds, and validated alternative options for smartphone and tablet power architecture design.
Technical Context
The FAN48623UC315X operates in continuous conduction mode (CCM) at ~2.5 MHz under moderate-to-heavy loads and switches to discontinuous conduction mode (DCM) at light loads to maintain >97% peak efficiency. Its current-mode modulator ensures fast transient response and smooth CCM/DCM transitions.
Bypass activation is voltage-triggered: automatic entry occurs when VIN exceeds VOUT_TARGET +30 mV (hysteresis), and forced bypass is enabled via low-level assertion on the BYP pin. During bypass, Q1 and Q3 fully enhance to deliver <160 mV VIN-to-VOUT drop at full load, with short-circuit protection active only in boost mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.15 V / 3.33 V dual-option fixed output; accuracy ±1.0% to ±4.0% over load and temperature. |
| Max Continuous Load | 2500 mA at VIN = 2.5 V → VOUT = 3.15 V; supports GSM PA pulse loads up to 3.5 A (1-slot) with VIN = 3.1 V. |
| Efficiency | Up to 97% at 3.15 V output, 2.5 V input, and 1 A load - enables extended battery runtime in space-constrained portable devices. |
| Quiescent Current | 6–12 µA in forced bypass mode; 135–190 µA in boost mode - critical for low-power standby states in always-on subsystems. |
| Input Voltage Range | 2.5 V to 5.5 V - accommodates single-cell Li-ion discharge curve (4.2 V → 2.5 V) while supporting brownout prevention. |
| Switching Frequency | ~2.5 MHz in CCM - allows use of ultra-small 0.47 µH inductor (2520 case) and 0603 ceramic capacitors for minimal PCB footprint. |
| Protection Features | Short-circuit protection (SCP), under-voltage lockout (UVLO = 2.20–2.35 V), thermal shutdown (>150°C), and true load disconnect. |
Pinout & Package
Package: 16-bump, 1.81 mm × 1.81 mm, 0.4 mm pitch Wafer-Level Chip-Scale Package (WLCSP) with 250 µm solder balls; thermal resistance θJA = 60 °C/W on 4-layer evaluation board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 EN | Enable control input | Active-high logic enable; requires VIH ≥ 1.05 V; internal 300 kΩ pull-down ensures safe shutdown if left floating. |
| A2 PG | Open-drain power-good flag | Asserts high after successful soft-start; de-asserts during fault, overload, or die temperature >125°C - used for system sequencing and thermal warning. |
| A3/A4 VIN | Main input power rail | Accepts 2.5–5.5 V; connects directly to Li-ion battery; internal UVLO prevents operation below 2.20 V to avoid battery deep discharge. |
| B1 VSEL | Output voltage select | Configures target VOUT between 3.15 V and 3.33 V during boost operation; logic-level compatible with 1.8 V GPIO. |
| B3/B4 VOUT | Regulated output rail | Delivers up to 2500 mA; requires 2×22 µF X5R 0603 output capacitance placed adjacent to PGND pins for stability and low ripple. |
| C1 BYP | Forced bypass mode control | Pull LOW to activate zero-quiescent-current bypass; internal logic waits for VOUT < VIN before enabling conduction path. |
| C3/C4 SW | Internal switching node | Connects to 0.47 µH inductor; carries high di/dt; must be routed short/wide and isolated from sensitive traces to minimize EMI. |
| D1 AGND | Analog ground reference | Signal ground for internal error amplifier and reference; must tie to PGND at single point to avoid noise coupling into regulation loop. |
| D2–D4 PGND | Power ground return | Low-impedance return for inductor current and output capacitor; shortest possible trace to COUT reduces voltage spikes and improves thermal performance. |
| B2/C2 NC | No internal connection | Physical bumps present; must be connected to PGND for mechanical stability and thermal dissipation per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| True bypass operation | VIN-to-VOUT path with <160 mV drop at full load eliminates switching losses and reduces quiescent current to 6–12 µA - extends standby time in always-on RF modules. |
| Synchronous rectification | Integrated Q1/Q3 MOSFETs eliminate external Schottky diode, reducing component count and improving efficiency by ~5% vs. asynchronous designs at 1 A load. |
| VSEL-controlled output selection | Hardware-selectable 3.15 V / 3.33 V outputs allow one BOM to support multiple RF PA bias requirements without firmware changes or external resistors. |
| Automatic bypass transition | Hysteresis-based entry (VIN > VOUT_TARGET +30 mV) and exit (VOUT < VOUT_TARGET −50 mV) prevent oscillation during battery voltage sag/swell near threshold. |
| Soft-start with linear pre-charge | Two-stage LIN startup (1 A → 2 A) followed by controlled SS ramp avoids inrush current damage to 0603 capacitors and enables reliable cold-start from 2.5 V battery. |
Applications
| Smartphone RF Power Amplifier Supply | Tablet System PMIC LDO Input Rail |
|---|---|
Use Scenario: Supplies 3.15 V bias to 2G/3G/4G LTE power amplifiers during transmit bursts, maintaining stable voltage as Li-ion battery discharges from 4.2 V to 2.8 V. IC Role / Device Role / Timing Role: Boost regulator with automatic bypass - operates in boost mode during low-VIN transmit slots, seamlessly transitions to bypass when VIN > 3.15 V to minimize loss and heat. Use Value: Enables 3.5 A GSM pulse capability without external current boost, while achieving >95% efficiency across full battery range - extends talk time by 12% vs. legacy charge-pump solutions. |
Use Scenario: Powers downstream 1.2 V/1.8 V LDOs in multi-rail PMIC architectures where input rail must remain regulated above 3.0 V despite battery voltage droop. IC Role / Device Role / Timing Role: Primary voltage step-up stage - provides clean, low-noise 3.15 V rail with <20 mV ripple at 2 A load, supporting fast LDO transient response. Use Value: Eliminates need for oversized battery or additional buck-boost ICs; 0.47 µH inductor + 2×22 µF capacitors fit within 3.5 mm² PCB area - saves 30% board space vs. discrete alternatives. |
| Portable Medical Sensor Node | Wearable Bluetooth Audio Module |
Use Scenario: Powers ultra-low-power analog front-end (AFE) and BLE SoC in disposable glucose monitors, operating continuously for 7 days on a single 120 mAh coin cell. IC Role / Device Role / Timing Role: Energy-harvesting-optimized boost converter - leverages 140 µA quiescent current in auto-bypass and 4 µA shutdown to maximize shelf life. Use Value: Delivers 2500 mA peak for sensor excitation pulses while sustaining <1 µA average system current in sleep - extends usable battery life beyond 2000 hours. |
Use Scenario: Supplies 3.33 V to Class-D audio amplifier and Bluetooth 5.0 radio in compact earbud designs where thermal headroom is limited to <15°C rise. IC Role / Device Role / Timing Role: Thermally efficient power source - 60 °C/W θJA and WLCSP package enable direct thermal coupling to PCB copper pour, limiting junction rise to 90°C at 2 A. Use Value: Avoids thermal throttling during sustained audio playback; 97% peak efficiency reduces heat generation by 40% vs. linear regulators - enables smaller battery and longer playtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61236PDSGR | 2.5 A max output, 3.3 V fixed, 2.3–5.5 V input, 2.1 MHz switching, no bypass mode, larger 2.0 mm × 2.0 mm DSBGA package. | Lacks automatic/forced bypass; requires external circuitry for low-IQ operation - unsuitable for battery-critical standby modes. | Select when board space permits larger package and bypass functionality is not required for system-level power sequencing. |
| MAX8815AETE+T | 2.0 A max output, 3.3 V fixed, 2.6–5.5 V input, 2.0 MHz switching, integrated soft-start, no VSEL or BYP control pins. | Fixed 3.3 V only; no hardware-selectable voltage or forced bypass - limits flexibility in multi-PA RF platforms. | Choose for cost-sensitive designs where dual-output selection and ultra-low bypass IQ are not needed. |
Compared with TPS61236PDSGR and MAX8815AETE+T, the FAN48623UC315X uniquely combines dual-output selection (3.15 V / 3.33 V), true bypass with <12 µA IQ, and 1.81 mm × 1.81 mm WLCSP - making it optimal for space-constrained, battery-life-critical RF power management in premium smartphones.
Availability
FAN48623UC315X is available at Aetrix Electronics and suitable for smartphone RF PA supplies, tablet PMIC input rails, and wearable Bluetooth audio modules requiring stable component supply, long-term lifecycle support, and wafer-level packaging for miniaturized designs.
Supply support for FAN48623UC315X 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 (now part of ON Semiconductor) is a global leader in power management and analog ICs, specializing in high-efficiency, small-footprint solutions for portable and battery-powered systems.
The FAN48623 product line was designed specifically for advanced Li-ion battery chemistries in mobile devices, delivering high-current boost with seamless bypass transition to extend runtime and simplify power architecture.
FAQ
What is the exact output voltage configuration of the FAN48623UC315X?
The FAN48623UC315X is factory-configured for dual-output operation: 3.15 V (primary) and 3.33 V (secondary). The VSEL pin selects between these two voltages during boost mode; both values are guaranteed across temperature and load per datasheet Table 1 and Figure 13–16.
How does the FAN48623UC315X handle input voltage transitions near the bypass threshold?
The FAN48623UC315X uses 30 mV hysteresis for bypass entry (VIN > VOUT_TARGET +30 mV) and 50 mV hysteresis for exit (VOUT < VOUT_TARGET −50 mV) to prevent oscillation. This ensures stable mode transitions even during battery voltage ripple or load-induced droop near the 3.15 V threshold.
Can the FAN48623UC315X drive a 2.5 A continuous load at 3.15 V with 2.5 V input?
Yes - the FAN48623UC315X guarantees 2500 mA continuous output at VIN = 2.5 V and VOUT = 3.15 V per datasheet Recommended Operating Conditions and Figure 24, provided thermal design maintains TJ ≤ 125°C using the specified WLCSP layout and copper pour.
What is the minimum output capacitance required for stable operation of the FAN48623UC315X at 3.15 V?
Per datasheet Table 4, the FAN48623UC315X requires a minimum effective output capacitance (CEFF) of 9 µF at 3.15 V output. With two 22 µF, 0603, X5R, 10 V-rated capacitors (e.g., TDK C1608X5R1A226M), CEFF remains >12 µF across bias, ensuring guaranteed stability.
Does the FAN48623UC315X support forced bypass mode, and how is it activated?
Yes - forced bypass mode is activated by pulling the BYP pin LOW. The FAN48623UC315X then disables most internal circuitry except UVLO and enters a <12 µA quiescent state with full conduction between VIN and VOUT, ideal for ultra-low-power standby in always-on RF receivers.
FAN48623UC315X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyBoost®
- Package/Case:
- 16-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.15V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLCSP (1.78x1.78)
FAN48623UC315X FAQ
1.How can I place an order for FAN48623UC315X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN48623UC315X 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 FAN48623UC315X reliable?
The price and inventory of FAN48623UC315X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN48623UC315X is usually 5 days.
3.What payment methods are accepted for FAN48623UC315X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN48623UC315X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN48623UC315X?
FAN48623UC315X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN48623UC315X 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 FAN48623UC315X?
For technical support, including FAN48623UC315X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN48623UC315X requirements.
6.How does Aetrix verify that FAN48623UC315X is sourced from the original manufacturer or authorized distributors?
All FAN48623UC315X 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 FAN48623UC315X meets industry standards.
7.What is the process for return or replacement of FAN48623UC315X?
All FAN48623UC315X units undergo pre-shipment inspection (PSI). If there is an issue with FAN48623UC315X, 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 FAN48623UC315X part is unused and in its original packaging.
Return procedure for FAN48623UC315X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN48623UC315X 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…
