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Diodes Incorporated APS39903MTR-G1
- Part No.:
- APS39903MTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Datasheet:
-
APS39903MTR-G1.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 7SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,150
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Product details
Overview
APS39903MTR-G1 from Diodes Incorporated is a primary-side regulation (PSR) AC/DC switcher IC with integrated 700V NPN transistor, designed for MediaTek Pump Express™-compliant battery chargers and adapters. It delivers ±5% CV accuracy at 5V output, supports adaptive p-PFM control across 0–100% load, enables programmable 3.6–5.0V output via CPC pin current-pattern detection, and achieves ultra-low standby power (<5V output, no auxiliary supply required).
For engineers reviewing the APS39903MTR-G1 datasheet, APS39903MTR-G1 pinout, APS39903MTR-G1 application, or APS39903MTR-G1 equivalent, key selection criteria include its built-in 700V BJT, cable voltage drop compensation (6%), valley-turn-on EMI reduction, multi-segment current-sense thresholds (VCS_H/VCS_M/VCS_L), and Pump Express™-aligned dynamic voltage scaling.
Technical Context
The APS39903 operates in discontinuous conduction mode (DCM) using piece-wise Pulse Frequency Modulation (p-PFM) to regulate both constant voltage (CV) and constant current (CC) outputs without secondary-side feedback. Its FB pin samples auxiliary winding voltage for precise output voltage sensing, while CS pin monitors primary current via external sense resistor for peak-current-based CC control.
Valley-turn-on logic activates when tOFF < 32μs, reducing switching loss and enabling intrinsic frequency jitter; an additional active VCS modulation (±3%, 256μs period) ensures consistent EMI suppression across full load range. Output voltage is dynamically adjusted in 0.2V steps (3.6V–5.0V) by detecting CPC pin current patterns aligned to MediaTek Pump Express™ timing sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Programmable 3.6V–5.0V in 0.2V steps via CPC pin current-pattern detection per Pump Express™ protocol. |
| CV Accuracy @5V | ±5% at FB pin threshold of 4.00V (3.94–4.06V), enabling tight regulation without optocoupler or TL431. |
| Integrated Transistor | 700V CBO NPN BJT with 1.5A collector current rating and 0.3V VCE(SAT) @0.5A, eliminating external high-voltage switch. |
| Cable Compensation | Fixed 6% of nominal output voltage (e.g., 300mV for 5V system), pre-compensating for USB cable IR drop without external circuitry. |
| Standby Power | Ultra-low quiescent current: 435–565μA ICC_QST, enabling <30mW no-load input power in 5V adapter designs. |
| Protection Features | Built-in OVP (7.5V FB trip), SCP with hiccup, OTP (140°C shutdown), OCkP, RCS short detection, and leading-edge blanking (200–575ns). |
| Frequency Jitter | Active ±3% VCS modulation at 256μs period, plus valley-turn-on randomness, collectively suppressing conducted EMI across 2–60kHz operating range. |
Pinout & Package
APS39903MTR-G1 is housed in a 7-pin SOIC (SO-7) package with gull-wing leads, optimized for high-voltage flyback PCB layout and thermal dissipation (θJA = 100°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CPC | Current Pattern Control | Detects load-current-modulated current pulses to select output voltage level per Pump Express™; sets cable compensation time constant with external capacitor. |
| 2 - FB | Feedback Input | Samples auxiliary winding voltage for primary-side regulation; triggers OVP at 7.5V and SCP at 1.7V. |
| 3 - VCC | Supply Input | Power rail for internal bias; requires low-ESR capacitor placed adjacent to pin; UVLO activates below 5.8V. |
| 4 - CS | Current Sense Input | Monitors primary-side current via external resistor; turns off BJT when voltage reaches VCS_H (900mV typ) or VCS_L (350mV typ). |
| 5,6 - C | Collector Terminal | High-voltage collector node of integrated 700V NPN transistor; connects directly to primary winding of flyback transformer. |
| 7 - GND | Power Ground | Reference for all internal circuits and CS/FB comparators; must be low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Pump Express™ Compatibility | Native support for MediaTek's fast-charging protocol via CPC pin timing patterns-no firmware or MCU required. |
| Valley-Turn-On Switching | Reduces BJT turn-on loss and radiated EMI by synchronizing switching to minimum drain voltage points in DCM. |
| Multi-Segment p-PFM | Three distinct current-sense thresholds (VCS_H/VCS_M/VCS_L) prevent audio noise by avoiding 2–20kHz frequency collapse at light loads. |
| Fixed Cable Compensation | 6% output voltage boost applied internally-eliminates need for external compensation resistors or op-amps in USB charging designs. |
| Ultra-Low Standby Consumption | 500μA typical quiescent current enables Energy Star Tier 2 and EU CoC v5 compliance in 5V/1A adapters. |
Applications
| Smartphone Fast Charging Adapter | USB-C Wall Charger |
|---|---|
Use Scenario: 5V–5.0V/1A adapter for MediaTek-based smartphones supporting Pump Express™ fast charging. IC Role / Device Role / Timing Role: Primary-side regulation controller and integrated 700V BJT switch; executes real-time voltage stepping (3.6V→5.0V) via CPC pin pattern recognition. Use Value: Eliminates optocoupler, TL431, and secondary-side sensing components-reducing BOM cost by ≥30% and PCB area by 25%. |
Use Scenario: Compact 5W USB wall charger requiring <30mW no-load power and universal 90–264VAC input. IC Role / Device Role / Timing Role: PSR flyback controller with valley-turn-on and active frequency jitter; regulates output using only auxiliary winding feedback. Use Value: Achieves <85% efficiency at full load and passes CISPR-32 Class B conducted EMI without Y-cap or common-mode choke. |
| Tablet Charging Power Supply | IoT Device AC/DC Module |
Use Scenario: 5V/2A tablet adapter needing robust over-temperature and short-circuit protection. IC Role / Device Role / Timing Role: Integrated PSR switcher with hiccup-mode SCP, 140°C OTP shutdown, and open-circuit protection (OCkP). Use Value: Enables single-layer PCB design with self-recovering fault handling-no manual reset or external latch required. |
Use Scenario: Low-power IoT gateway requiring stable 5V rail from universal AC input with minimal standby consumption. IC Role / Device Role / Timing Role: Standalone AC/DC converter IC delivering regulated 5V with <500μA quiescent current and fixed 6% cable compensation. Use Value: Supports always-on operation with <0.1W standby power-meets IEC 62301 Ed.2 Class I requirements for connected devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSR AC/DC switcher applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6004GQ-Z | Integrated 650V MOSFET; no native Pump Express™ support; requires external VDD startup circuit. | Lacks CPC-based voltage stepping-suitable for fixed-output adapters only. | Prefer for cost-sensitive fixed-5V designs where protocol flexibility is unnecessary. |
| LNK364PG | 725V BJT; no valley-turn-on or active frequency jitter; ±6% CV accuracy. | Higher EMI emissions require larger filter components; no cable compensation. | Choose when legacy design reuse is prioritized over EMI performance or USB-C compatibility. |
Compared with MP6004GQ-Z and LNK364PG, APS39903MTR-G1 uniquely combines Pump Express™ protocol execution, integrated 700V BJT, and active EMI suppression-enabling smaller, quieter, and smarter USB charging solutions without secondary feedback or microcontroller intervention.
Availability
APS39903MTR-G1 is available at Aetrix Electronics and suitable for smartphone fast chargers, USB-C wall adapters, tablet power supplies, and IoT AC/DC modules requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for APS39903MTR-G1 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-performance power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.
The APS39903 belongs to Diodes' Pump Express™-optimized PSR switcher product line, engineered specifically for cost-effective, compact, and EMI-compliant AC/DC conversion in USB fast-charging applications.
FAQ
What is the maximum output power achievable with APS39903MTR-G1 in a standard flyback design?
APS39903MTR-G1 supports up to 5W output power in typical 5V/1A applications, validated in Diodes' reference design (DS37226 Figure 1). Its 700V BJT and 1.5A collector rating allow safe operation with 100kHz+ switching in DCM, but thermal limits and transformer design constrain practical continuous output to ≤5W at ambient ≤50°C.
Does APS39903MTR-G1 require an external startup resistor or auxiliary winding for VCC supply?
No. APS39903MTR-G1 features ultra-low startup current (≤0.6μA) and can initiate operation directly from bulk capacitor via internal high-voltage startup circuitry. Once running, VCC is sustained by the auxiliary winding-eliminating the need for external startup resistors or dedicated VCC windings in most 5W designs.
How does the CPC pin implement Pump Express™ voltage stepping without firmware?
The CPC pin detects current-pattern timing (tON_A/tON_B/tON_C/tOFF_D) generated by the host device's USB port. Internal state machine interprets these pulse widths to increment/decrement output voltage in 0.2V steps-fully hardware-based with no MCU, flash, or configuration registers required.
Can APS39903MTR-G1 operate without cable compensation enabled?
Yes. Cable compensation is fixed at 6% and cannot be disabled, but it is designed to be benign in non-USB applications: for a 5V nominal output, the 300mV boost is absorbed by typical output capacitor tolerance and load regulation-no adverse effect on stability or regulation accuracy occurs in fixed-output systems.
APS39903MTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- Pump Express™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Isolation:
- Isolated
- Internal Switch(s):
- Yes
- Voltage - Breakdown:
- 700V
- Topology:
- Flyback
- Voltage - Start Up:
- 15.5 V
- Voltage - Supply (Vcc/Vdd):
- 5.8V
- Duty Cycle:
- -
- Frequency - Switching:
- -
- Power (Watts):
- -
- Fault Protection:
- Over Temperature, Over Voltage, Short Circuit
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 7-SO
- Mounting Type:
- Surface Mount
APS39903MTR-G1 FAQ
1.How can I place an order for APS39903MTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for APS39903MTR-G1 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 APS39903MTR-G1 reliable?
The price and inventory of APS39903MTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APS39903MTR-G1 is usually 5 days.
3.What payment methods are accepted for APS39903MTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APS39903MTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APS39903MTR-G1?
APS39903MTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APS39903MTR-G1 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 APS39903MTR-G1?
For technical support, including APS39903MTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APS39903MTR-G1 requirements.
6.How does Aetrix verify that APS39903MTR-G1 is sourced from the original manufacturer or authorized distributors?
All APS39903MTR-G1 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 APS39903MTR-G1 meets industry standards.
7.What is the process for return or replacement of APS39903MTR-G1?
All APS39903MTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with APS39903MTR-G1, 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 APS39903MTR-G1 part is unused and in its original packaging.
Return procedure for APS39903MTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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