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Diodes Incorporated AP7315-185FS4-7B
- Part No.:
- AP7315-185FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7315-185FS4-7B.pdf
- Description:
- IC REG LINEAR 1.85V 150MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,695
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Product details
Overview
AP7315-185FS4-7B from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 1.85V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, operates from 1.7V to 5.25V input, and targets RF supply rails in compact portable electronics.
For engineers reviewing the AP7315-185FS4-7B datasheet, AP7315-185FS4-7B pinout, AP7315-185FS4-7B application, or AP7315-185FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (max 0.34V for 1.7V ≤ VOUT < 2.0V), thermal performance in X2-DFN1010-4 package, EN logic thresholds (0.5V low / 1.3V high), and stability with 0.47µF ceramic output capacitance.
Technical Context
The AP7315-185FS4-7B uses a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge configuration means the output remains floating during shutdown-no internal discharge path is present.
It delivers regulated 1.85V output with guaranteed 150mA load capability across –40°C to +85°C ambient, maintaining ±1% output accuracy under line/load transients and exhibiting 0.34V typical dropout at full load within its specified VOUT range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85V ±1% - ensures stable bias for 1.8V I/O domains without external feedback network. |
| Max Output Current | 150mA - sufficient for powering RF transceivers, camera sensors, or baseband ICs in handheld devices. |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding noisy power rails. |
| Output Noise | 60µVrms (10Hz–100kHz) - minimizes phase noise impact on RF front-end and ADC reference paths. |
| Quiescent Current | 35µA typical - enables multi-day battery life in always-on sensor or standby-mode subsystems. |
| Input Voltage Range | 1.7V to 5.25V - compatible with single-cell Li-ion (2.7–4.2V), Li-polymer, or 3.3V/5V system rails. |
| Dropout Voltage | 0.34V max at 150mA (for 1.7V ≤ VOUT < 2.0V) - preserves regulation headroom in low-VIN scenarios like battery brownout. |
Pinout & Package
The AP7315-185FS4-7B is housed in a 4-pin X2-DFN1010-4 package (1.0mm × 1.0mm, 0.4mm pitch), featuring an exposed thermal pad for enhanced heat dissipation. PCB layout requires connecting the thermal pad to GND via multiple vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 4) | Power input | Accepts 1.7–5.25V; requires 0.47µF ceramic capacitor placed adjacent to minimize input impedance and suppress supply glitches. |
| GND (Pin 2) | Ground reference | Primary return path for load current and regulator internal circuits; must connect directly to low-impedance ground plane. |
| EN (Pin 3) | Enable control | Active-high logic input; drives regulator ON when ≥1.3V, OFF when ≤0.5V; must not float-tie to VIN if unused. |
| VOUT (Pin 1) | Regulated output | Delivers stable 1.85V; requires 0.47µF ceramic capacitor near pin to ensure transient response and loop stability. |
| Thermal PAD | Thermal interface | Not electrically connected; must be soldered to GND copper area using ≥4 thermal vias for effective junction-to-board conduction. |
Key Features
| Feature | Design Value |
|---|---|
| High PSRR | 75dB at 1kHz - maintains clean output under ripple from switching regulators sharing same input rail. |
| Ultra-low noise | 60µVrms (10Hz–100kHz) - avoids degradation of SNR in analog signal chains and RF local oscillators. |
| Precision output | ±1% accuracy over temperature - eliminates need for post-production calibration in precision voltage domains. |
| Low IQ operation | 35µA quiescent current - extends battery runtime in always-on IoT nodes and wearable sensors. |
| Wide input range | 1.7V to 5.25V - supports direct connection to partially discharged batteries or multi-rail system supplies. |
Applications
| RF Power Amplifier Bias | Camera Sensor Core Supply |
|---|---|
|
Use Scenario: Providing clean, low-noise bias voltage to GaAs or SiGe RF power amplifiers in 4G/5G mobile front-ends. IC Role / Device Role / Timing Role: LDO regulator delivering stable 1.85V to PA drain or gate bias networks. Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM distortion and adjacent-channel leakage in transmit paths. |
Use Scenario: Powering image sensor analog core (ADC reference, pixel array bias) in smartphone rear cameras. IC Role / Device Role / Timing Role: Low-noise voltage source for precision analog blocks requiring minimal supply-induced jitter. Use Value: ±1% output accuracy and low thermal drift (±30ppm/°C) maintain consistent exposure and color fidelity across operating temperature. |
| Wireless Adapter SoC I/O Rail | Portable Media Player Audio Codec Supply |
|
Use Scenario: Supplying 1.85V I/O domain for Wi-Fi/BT combo chips in USB dongles or embedded modules. IC Role / Device Role / Timing Role: Regulated power rail enabling level-shifting between host processor and wireless PHY interface. Use Value: 150mA output capacity and fast load transient response (<100µs settling) support burst-mode data transfers without rail collapse. |
Use Scenario: Delivering low-noise supply to stereo audio DACs and headphone amplifiers in portable music players. IC Role / Device Role / Timing Role: Clean analog supply isolating sensitive audio circuitry from digital switching noise. Use Value: 35µA quiescent current extends playback time; 0.34V dropout allows operation down to 2.2V battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/MB | 100mA output, 6µA IQ, SOT23-3 package - no enable pin, lower current, smaller footprint. | Limited to ultra-low-power microcontrollers or sensors; unsuitable for RF PA or camera loads >100mA. | Select when board space is critical and load current stays below 100mA; verify EN functionality is unnecessary. |
| Torex XC6219B185MR-G | 150mA output, 25µA IQ, 70dB PSRR at 1kHz, SOT23-5 package - includes CE pin but higher noise (80µVrms). | Acceptable for digital I/O rails where noise sensitivity is moderate; less ideal for RF/analog signal chains. | Choose if lowest possible quiescent current is prioritized over noise/PSRR; confirm layout accommodates SOT23-5 pinout. |
Compared with MCP1700-1802E/MB and XC6219B185MR-G, the AP7315-185FS4-7B uniquely balances 150mA drive, 60µVrms noise, and 75dB PSRR in a 1.0mm² DFN - making it optimal for space-constrained RF and imaging subsystems demanding both performance and density.
Availability
AP7315-185FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, and wireless adapter SoC I/O rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AP7315-185FS4-7B 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AP7315 series belongs to Diodes' high-performance LDO portfolio, designed specifically for noise-sensitive portable electronics where small size, low IQ, and high PSRR are mandatory for RF and imaging subsystems.
FAQ
What is the maximum allowable input voltage for AP7315-185FS4-7B?
The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks violating safe operating area limits and may trigger internal protection or cause permanent damage. Operation above 5.25V is not characterized or guaranteed per datasheet specifications.
Does AP7315-185FS4-7B include an internal discharge transistor?
No. The "-7B" suffix and part number AP7315-185FS4-7B denote the non-discharge version. When disabled via the EN pin, the output floats - there is no internal FET to discharge the output capacitor. For auto-discharge functionality, the AP7315D-185FS4-7B variant must be used.
Can AP7315-185FS4-7B operate with only a 0.22µF output capacitor?
No. The datasheet specifies a minimum 0.47µF ceramic capacitor for stability and transient response. Using 0.22µF violates the design requirement and may cause oscillation or poor load-step recovery, especially at 150mA load. Always use ≥0.47µF X5R/X7R ceramic with low ESR.
How does thermal performance differ between X2-DFN1010-4 and SOT23 packages?
The X2-DFN1010-4 package (used in AP7315-185FS4-7B) offers significantly better thermal resistance than SOT23 due to its exposed thermal pad. With proper PCB copper area and vias, θJA is ~170°C/W versus ~220°C/W for SOT23 - enabling 150mA continuous operation at higher ambient temperatures without derating.
AP7315-185FS4-7B 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):
- 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.44V @ 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
AP7315-185FS4-7B FAQ
1.How can I place an order for AP7315-185FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7315-185FS4-7B 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 AP7315-185FS4-7B reliable?
The price and inventory of AP7315-185FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-185FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7315-185FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-185FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7315-185FS4-7B?
AP7315-185FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7315-185FS4-7B 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 AP7315-185FS4-7B?
For technical support, including AP7315-185FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-185FS4-7B requirements.
6.How does Aetrix verify that AP7315-185FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7315-185FS4-7B 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 AP7315-185FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7315-185FS4-7B?
All AP7315-185FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-185FS4-7B, 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 AP7315-185FS4-7B part is unused and in its original packaging.
Return procedure for AP7315-185FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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