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Diodes Incorporated AP7315D-33FS4-7B
- Part No.:
- AP7315D-33FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7315D-33FS4-7B.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
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Product details
Overview
AP7315D-33FS4-7B from Diodes Incorporated is a 3.3V fixed-output, 150mA low-dropout linear regulator with integrated discharge function, high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), and ±1% output voltage accuracy over temperature. It operates from 1.7V to 5.25V input and delivers stable power to RF supply rails and camera sensor subsystems in space-constrained portable electronics.
For engineers reviewing the AP7315D-33FS4-7B datasheet, AP7315D-33FS4-7B pinout, AP7315D-33FS4-7B application, or AP7315D-33FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (max 290mV), enable threshold compatibility (VEN(H) ≥ 1.3V), thermal performance in X2-DFN1010-4, and discharge functionality for rapid VOUT decay during shutdown.
Technical Context
The AP7315D-33FS4-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path (30Ω N-channel MOSFET) tied to the EN pin. Its architecture enables fast load transient response (<100µs settling) and maintains regulation down to 210mV dropout at 3.3V/150mA.
It supports stable operation with 0.47µF ceramic input/output capacitors, requires no external compensation, and features built-in short-circuit protection (fold-back limit ~55mA) and thermal shutdown. The discharge function activates automatically when EN is pulled low, discharging COUT through the internal FET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% at +25°C; ensures precise biasing for 3.3V logic, RF ICs, and image sensors without external feedback. |
| Max Output Current | 150mA continuous; sufficient for powering baseband processors, PMIC rails, or dual-camera modules in handheld devices. |
| PSRR | 75dB at 1kHz; suppresses switching noise from DC-DC converters feeding the LDO input, critical for clean RF supply. |
| Output Noise | 60µVrms (10Hz–100kHz); minimizes phase noise in VCOs and jitter in high-speed serial interfaces. |
| Quiescent Current | 35µA typical at no load; extends battery life in always-on sensor or standby circuits. |
| Dropout Voltage | 290mV max at 150mA; enables operation from single-cell Li-ion (3.0V min) while maintaining 3.3V output. |
| Enable Threshold | VEN(H) ≥ 1.3V; compatible with 1.8V/3.3V GPIOs without level-shifting. |
| Discharge Resistance | 30Ω typical; discharges 10µF output cap from 3.3V to 0.5V in <1ms, preventing latch-up in downstream logic. |
Pinout & Package
AP7315D-33FS4-7B uses the X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) package with wettable flank leads for automated optical inspection. Thermal pad is exposed on bottom and must be connected to PCB ground plane for optimal thermal dissipation (θJA = 220°C/W on JEDEC High-K board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply connection | Accepts 1.7V–5.25V; requires 0.47µF ceramic capacitor placed within 1mm of pin for stability and noise rejection. |
| GND (Pin 2) | Power ground reference | Low-impedance return path; must connect directly to thermal pad and system ground plane to minimize noise coupling. |
| EN (Pin 3) | Active-high enable control | Pulling low disables regulator and activates internal discharge FET; floating state is prohibited-tie to VIN if unused. |
| VOUT (Pin 4) | Regulated output voltage | Delivers 3.3V ±1%; output capacitor must be placed adjacent to this pin and GND to reduce ESR-induced instability. |
| Thermal Pad | Exposed copper thermal interface | Not electrically functional as GND; soldered to large copper area connected to system ground for thermal management only. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 60µVrms (10Hz–100kHz) enables use in analog front-ends and RF power amplifiers without additional filtering. |
| Integrated discharge path | 30Ω on-chip N-MOSFET ensures rapid VOUT decay during shutdown, preventing back-powering of upstream circuitry. |
| High PSRR across frequency | 75dB at 1kHz and >50dB up to 100kHz; rejects ripple from switching regulators and digital noise sources. |
| Wide input voltage range | 1.7V–5.25V supports direct connection to Li-ion, USB, or multi-rail PMIC outputs without pre-regulation. |
| ±1% output accuracy | Guaranteed over -40°C to +85°C ambient; eliminates need for post-production calibration in consumer-grade designs. |
| Low quiescent current | 35µA typical at zero load; reduces standby power in battery-powered IoT nodes and wearable sensors. |
Applications
| RF Power Amplifier Bias Supply | CMOS Image Sensor Core Rail |
|---|---|
|
Use Scenario: Providing clean, low-noise 3.3V bias to GaAs pHEMT power amplifiers in 4G/5G mobile front-ends. IC Role / Device Role / Timing Role: Low-noise LDO delivering stable VCC to PA drain; discharge function prevents residual voltage from disrupting TDD timing during transmit/receive transitions. Use Value: 60µVrms noise avoids AM-to-PM distortion; 75dB PSRR isolates PA from noisy SoC supply rails. |
Use Scenario: Powering the analog core and PLL of high-resolution CMOS image sensors in smartphone cameras. IC Role / Device Role / Timing Role: Precision 3.3V regulator for sensor analog blocks; ±1% accuracy ensures consistent ADC reference and pixel response linearity. Use Value: Low dropout allows operation from declining battery voltage; fast transient response prevents image artifacts during exposure changes. |
| Wireless Adapter Baseband IC | Portable Media Player Audio Codec |
|
Use Scenario: Supplying 3.3V to Wi-Fi/BT baseband processors in compact USB dongles and embedded modules. IC Role / Device Role / Timing Role: Primary system rail LDO; enable pin synchronized to host USB suspend/resume for power gating. Use Value: 35µA quiescent current extends idle battery life; 150mA capacity supports burst-mode packet processing. |
Use Scenario: Delivering regulated 3.3V to stereo audio codecs and DACs in portable music players. IC Role / Device Role / Timing Role: Low-noise analog supply rail; discharge function clears residual charge before codec reset to prevent pop/click artifacts. Use Value: 60µVrms noise floor preserves SNR >100dB; ±1% accuracy maintains consistent volume scaling across battery discharge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | No discharge function; 250mV dropout at 150mA; 17µA IQ; SOT23-3 package | Lacks active discharge-requires external circuitry for fast VOUT decay; larger footprint than X2-DFN1010-4 | Select when ultra-low IQ is prioritized over discharge capability and board area. |
| Torex XC6219B332MR-G | Discharge enabled; 200mV dropout at 150mA; 45µA IQ; SOT25-5 package with NC pin | Higher dropout margin allows tighter input headroom; NC pin adds layout flexibility but increases package size | Choose when lower dropout is critical and SOT25 mechanical compatibility is required. |
Compared with MCP1700-3302E/TO and XC6219B332MR-G, AP7315D-33FS4-7B uniquely combines sub-0.3mm dropout, integrated discharge, and 1.0mm² footprint-making it optimal for ultra-thin mobile camera modules where board area and shutdown behavior are design-critical.
Availability
AP7315D-33FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier biasing, CMOS image sensor core rails, wireless adapter baseband ICs, and portable media player audio codecs requiring stable component supply and long-term production continuity.
Supply support for AP7315D-33FS4-7B 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.
The AP7315 series targets space-constrained portable electronics, delivering high-PSRR, low-noise LDO performance in ultra-small packages to replace legacy regulators in next-generation smartphones, wearables, and IoT edge devices.
FAQ
What is the maximum allowable input voltage for AP7315D-33FS4-7B?
The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may cause excessive power dissipation or violate safe operating area limits, especially at high ambient temperatures. Operation above 5.25V is not guaranteed and risks permanent damage per Absolute Maximum Ratings.
Does AP7315D-33FS4-7B require an external pull-up resistor on the EN pin?
No external pull-up is required. When the EN pin is left unconnected, leakage current and internal structure may cause undefined behavior. If enable control is unused, Diodes recommends tying EN directly to VIN to ensure reliable turn-on. A pull-up to VIN guarantees VEN ≥ 1.3V across all operating conditions.
How does the discharge function operate during shutdown?
When EN is driven low, the internal 30Ω N-channel MOSFET connects VOUT to GND, actively discharging the output capacitor. This occurs within microseconds of EN deactivation and clears 10µF loads to <0.5V in under 1ms. The discharge path remains active until EN returns high or VOUT falls below ~0.4V.
Can AP7315D-33FS4-7B be used with tantalum output capacitors?
No. The AP7315D-33FS4-7B is optimized for ceramic capacitors with ESR <100mΩ. Tantalum capacitors typically exhibit higher ESR and can induce oscillation or poor transient response. The datasheet explicitly recommends ceramic types (e.g., 0.47µF X5R/X7R) and provides ESR vs. IOUT stability charts confirming ceramic-only operation.
AP7315D-33FS4-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.29V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 75dB (1kHz)
- Control Features:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4
AP7315D-33FS4-7B FAQ
1.How can I place an order for AP7315D-33FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7315D-33FS4-7B 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 AP7315D-33FS4-7B reliable?
The price and inventory of AP7315D-33FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315D-33FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7315D-33FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315D-33FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7315D-33FS4-7B?
AP7315D-33FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7315D-33FS4-7B 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 AP7315D-33FS4-7B?
For technical support, including AP7315D-33FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315D-33FS4-7B requirements.
6.How does Aetrix verify that AP7315D-33FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7315D-33FS4-7B 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 AP7315D-33FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7315D-33FS4-7B?
All AP7315D-33FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7315D-33FS4-7B, 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 AP7315D-33FS4-7B part is unused and in its original packaging.
Return procedure for AP7315D-33FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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