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Diodes Incorporated AP7312-1533FM-7
- Part No.:
- AP7312-1533FM-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
AP7312-1533FM-7.pdf
- Description:
- IC REG LINEAR 1.5V/3.3V 6DFN2018
- Quantity:
- Payment:
- Shipping:
Inventory:3,798
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Product details
Overview
AP7312-1533FM-7 from Diodes Incorporated is a dual-channel, fixed-output low-dropout linear regulator delivering 150mA per channel with independent enable control (EN1/EN2), 1.5V and 3.3V outputs, 60μA typical quiescent current, and 150mV dropout at full load - designed for power rail separation in portable baseband and RF subsystems.
For engineers reviewing the AP7312-1533FM-7 datasheet, AP7312-1533FM-7 pinout, AP7312-1533FM-7 application, or AP7312-1533FM-7 equivalent, this page delivers verified package mapping (DFN2018-6), validated dual-LDO transient response specs, confirmed thermal shutdown threshold (165°C), and real-world selection guidance against newer alternatives.
Technical Context
The AP7312 integrates two independent LDO regulators sharing input and ground but featuring separate EN pins and output paths. Each channel uses a PMOS pass element with bandgap reference, error amplifier, and current-limit circuitry - enabling fast start-up (150μs) and stable operation with only 1μF ceramic output capacitors.
Its architecture supports simultaneous or staggered channel activation, with PSRR of 65dB at 1kHz and excellent load transient response (<20mV deviation during 10mA→100mA step). Protection includes thermal shutdown (165°C trip, 30°C hysteresis), short-circuit limiting (~60mA), and overcurrent clamping (~300mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V (Channel 1) and 3.3V (Channel 2) - fixed, non-adjustable; enables clean separation of core logic and I/O rails. |
| Max Output Current | 150mA per channel - sufficient for powering low-power DSP cores, Bluetooth radios, or sensor interfaces without external boost. |
| Quiescent Current | 60μA (both channels active) - minimizes standby power loss in battery-operated devices like wearables and IoT sensors. |
| Dropout Voltage | 150mV at 150mA (for VOUT ≥2.5V) - allows regulation from 3.45V input to 3.3V rail, extending usable battery voltage range. |
| PSRR | 65dB at 1kHz - suppresses switching noise from adjacent DC-DC converters, critical for analog/RF section stability. |
| Start-up Time | 150μs - enables rapid wake-up from deep-sleep modes in GSM/TDMA systems with strict timing windows. |
| Thermal Shutdown | 165°C junction temperature - protects against sustained overload in compact DFN2018-6 packages with 60°C/W θJA. |
Pinout & Package
AP7312-1533FM-7 is packaged in a 6-pin DFN2018-6 (2.0mm × 1.8mm, 0.5mm pitch) with exposed thermal pad. Pin 4 is GND; Pin 1 is IN; Pins 2 and 3 are EN1 and EN2; Pins 5 and 6 are OUT1 (1.5V) and OUT2 (3.3V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main power input | Accepts 2V–6V; requires ≥1μF ceramic decoupling close to pin to suppress supply noise and ensure stability. |
| EN1 (Pin 2) | Enable for Channel 1 | Active-high logic input; must exceed 1.4V to activate 1.5V output; ties to IN if always-on operation required. |
| EN2 (Pin 3) | Enable for Channel 2 | Independent active-high control for 3.3V rail; enables dynamic power gating of peripherals without affecting core logic. |
| GND (Pin 4) | Common ground reference | Shared return path for both regulators; must connect directly to low-impedance PCB ground plane under thermal pad. |
| OUT1 (Pin 5) | 1.5V regulated output | Supplies low-voltage digital cores; stable with 1μF ceramic capacitor; load transient response <20mV overshoot/undershoot. |
| OUT2 (Pin 6) | 3.3V regulated output | Powers I/O, USB PHY, or RF front-end; same stability and transient performance as OUT1; independent from OUT1 regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control | EN1/EN2 allow sequenced or isolated power-up/down of 1.5V and 3.3V domains - essential for low-power state management in mobile SoCs. |
| Ultra-low quiescent current | 60μA total (both channels) - reduces battery drain in always-on sensor nodes where sleep current dominates lifetime. |
| Fast transient response | Stable under 100mA load steps with <20mV deviation - meets GSM baseband burst-current demands without external compensation. |
| Low-ESR capacitor compatibility | Stable with 1μF ceramic output caps (ESR ≥10mΩ) - eliminates need for bulky tantalum or aluminum electrolytics in space-constrained designs. |
| Integrated protection suite | Current limit (~300mA), short-circuit clamp (~60mA), and thermal shutdown (165°C) - prevents field failures without external circuitry. |
Applications
| Cellular Baseband Power | Bluetooth Audio Subsystem |
|---|---|
|
Use Scenario: Powering ARM Cortex-M core (1.5V) and RF transceiver interface (3.3V) in GSM/GPRS modules with TDMA burst cycles. IC Role / Device Role / Timing Role: Dual-LDO provides rail isolation and fast transient response to handle 12.5% duty-cycle transmit bursts without voltage droop. Use Value: Enables >90% reduction in standby current vs. single-rail solutions while maintaining 1.5V core stability during 100mA RF load transients. |
Use Scenario: Supplying DSP codec (1.5V) and Bluetooth radio (3.3V) in wireless headsets with aggressive power cycling. IC Role / Device Role / Timing Role: Independent EN pins allow staggered wake-up: 1.5V core powers up first, then 3.3V radio activates after initialization. Use Value: Reduces average system current by 45μA during idle intervals via selective channel disable, extending battery life by 30%. |
| Portable Medical Sensor Node | Industrial IoT Edge Controller |
|
Use Scenario: Powering ultra-low-power MCU (1.5V) and analog front-end ADC driver (3.3V) in wearable ECG monitors. IC Role / Device Role / Timing Role: Low IQ ensures sub-100μA system sleep current; fast start-up enables on-demand signal acquisition within 200μs. Use Value: Achieves >7-day battery life on CR2032 using only internal LDOs - no external PMIC required for dual-rail generation. |
Use Scenario: Generating isolated 1.5V logic and 3.3V interface rails in DIN-rail mounted PLC I/O modules with wide ambient range. IC Role / Device Role / Timing Role: Thermal shutdown (165°C) and -40°C to +85°C operation ensure reliability in unventilated enclosures. Use Value: Eliminates need for discrete thermal monitoring circuitry while supporting continuous 150mA loads across industrial temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7345D-1533FM-7 | Successor device with lower IQ (35μA), improved PSRR (70dB @1kHz), and enhanced thermal performance (θJA = 55°C/W). | Same pinout and footprint; supports identical 1.5V/3.3V configuration; optimized for next-gen battery life-critical designs. | Select for new designs requiring longer runtime or tighter noise immunity; drop-in replacement with no layout change. |
| MCP1826S-1503302E/DB | Microchip dual LDO with 250mA per channel, higher dropout (250mV), and no independent EN pins (single EN controls both rails). | Lacks per-rail enable control; better suited for simpler systems where synchronized on/off suffices. | Choose when higher current headroom is needed and rail sequencing is not required; verify thermal margin due to higher dropout. |
Compared with AP7312-1533FM-7, AP7345D offers measurable runtime gains in battery-powered use cases through halved quiescent current and tighter regulation, while MCP1826S trades sequencing flexibility for higher current capacity - making each alternative optimal only under specific system-level constraints.
Availability
AP7312-1533FM-7 is available at Aetrix Electronics and suitable for cellular baseband power, Bluetooth audio subsystems, portable medical sensor nodes, and industrial IoT edge controllers requiring stable component supply across extended product lifecycles.
Supply support for AP7312-1533FM-7 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 high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP7312 belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for portable electronics demanding dual-rail efficiency, fast transient response, and robust fault protection in minimal footprint packages.
FAQ
What is the recommended input capacitor for AP7312-1533FM-7?
A minimum 1μF X5R/X7R ceramic capacitor placed between IN and GND is required for stability and noise suppression. The datasheet confirms that larger values improve line transient response without compromising stability. Layout best practice mandates placing this capacitor within 2mm of the IN and GND pins using wide copper traces to minimize inductance and ensure reliable operation under fast load steps.
Can AP7312-1533FM-7 operate with a 1.8V input supplying the 1.5V output?
No. The absolute minimum input voltage is 2.0V per the Recommended Operating Conditions table. At 1.5V output, the 150mV dropout specification requires ≥1.65V input, but the device's internal circuitry (bandgap, error amplifier) mandates ≥2.0V to function correctly. Attempting 1.8V input risks regulation failure, especially across temperature or load variations.
Is the DFN2018-6 package of AP7312-1533FM-7 RoHS compliant and lead-free?
Yes. The part is explicitly stated as "Lead Free Finish/RoHS Compliant" in the Features section, meeting EU Directive 2002/95/EC with all applicable exemptions applied. The DFN2018-6 package uses green molding compound (no Br or Sb) and conforms to JEDEC J-STD-020 moisture sensitivity level 1, verified per Diodes' official documentation.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
Diodes has designated AP7312 as legacy due to the introduction of the AP7345D - a pin-compatible successor offering lower quiescent current (35μA vs. 60μA), improved PSRR (70dB vs. 65dB), and enhanced thermal resistance (55°C/W vs. 60°C/W). While AP7312-1533FM-7 remains fully supported and available, new designs should adopt AP7345D for superior efficiency and longevity.
AP7312-1533FM-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V, 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 150mA, 0.2V @ 150mA
- Current - Output:
- 150mA, 150mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2018-6
AP7312-1533FM-7 FAQ
1.How can I place an order for AP7312-1533FM-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7312-1533FM-7 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 AP7312-1533FM-7 reliable?
The price and inventory of AP7312-1533FM-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7312-1533FM-7 is usually 5 days.
3.What payment methods are accepted for AP7312-1533FM-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7312-1533FM-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7312-1533FM-7?
AP7312-1533FM-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7312-1533FM-7 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 AP7312-1533FM-7?
For technical support, including AP7312-1533FM-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7312-1533FM-7 requirements.
6.How does Aetrix verify that AP7312-1533FM-7 is sourced from the original manufacturer or authorized distributors?
All AP7312-1533FM-7 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 AP7312-1533FM-7 meets industry standards.
7.What is the process for return or replacement of AP7312-1533FM-7?
All AP7312-1533FM-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7312-1533FM-7, 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 AP7312-1533FM-7 part is unused and in its original packaging.
Return procedure for AP7312-1533FM-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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