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Diodes Incorporated AP3407KTR-G1
- Part No.:
- AP3407KTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP3407KTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1.2A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,572
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Product details
Overview
AP3407KTR-G1 from Diodes Incorporated is a 1.4 MHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter in SOT-23-5 package, integrating low-RDS(ON) P- and N-channel MOSFETs to deliver up to 1.2 A output current with peak efficiency of 95% across 2.5–5.5 V input range; it supports adjustable output down to 0.6 V and enables 100% duty cycle in dropout-ideal for single-cell Li-ion portable power rails.
For engineers reviewing the AP3407KTR-G1 datasheet, AP3407KTR-G1 pinout, AP3407KTR-G1 application, or AP3407KTR-G1 equivalent, key selection criteria include its integrated synchronous switch architecture, thermal shutdown at +160°C, soft-start timing (~1 ms), UVLO threshold (2.3 V), and FB reference voltage accuracy (±2% over temperature).
Technical Context
The AP3407KTR-G1 implements current-mode control with internal oscillator set to 1.4 MHz (±20%), enabling compact external components including standard 2.2 µH inductors and ceramic input/output capacitors. Its error amplifier compares FB voltage against a 0.6 V reference, while the PWM comparator drives gate logic that manages both high-side P-MOS and low-side N-MOS switches.
Protection features are fully integrated: over-current protection triggers at 1.5–2.0 A, short-circuit detection shuts down SW within microseconds, thermal shutdown activates at +160°C with +20°C hysteresis, and UVLO prevents operation below 2.3 V with 0.2 V hysteresis-ensuring robustness in battery-voltage sag conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports full discharge curve of single Li-ion cell (3.0–4.2 V nominal) plus margin for transient spikes. |
| Output Current | 1.2 A continuous - sufficient for core logic rails in smartphones and wearables without external heatsinking. |
| Switching Frequency | 1.4 MHz (typ), 1.12–1.68 MHz (min–max) - enables use of small 2.2 µH inductors and reduces audible noise. |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(ON) (0.28 Ω P-MOS / 0.25 Ω N-MOS) minimizing conduction loss. |
| Feedback Reference | 0.6 V ±2% - sets output voltage via external resistor divider; enables precise regulation of 1.2 V, 1.8 V, 2.5 V, or 3.3 V rails. |
| Soft-start Time | ~1 ms - controls inrush current during power-up, preventing input rail collapse and reducing stress on input capacitor. |
| Thermal Shutdown | +160°C with +20°C hysteresis - protects die under sustained overload or poor PCB thermal design. |
Pinout & Package
SOT-23-5 package: 2.82 mm × 2.65 mm × 1.3 mm body, 0.95 mm lead pitch, thermally enhanced pad layout per Diodes' recommended footprint (E2 = 3.60 mm, G = 1.60 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable control input | Logic-level enable: >1.5 V activates regulator; <0.4 V forces shutdown with <1 µA quiescent current. |
| 2 (GND) | Power and signal ground | Common return for internal circuitry, feedback network, and power path; must be low-impedance connection to minimize noise coupling. |
| 3 (SW) | Switch node | Drain connection of internal P-MOS and N-MOS; connects directly to inductor; requires tight layout to reduce EMI and switching losses. |
| 4 (VIN) | Input supply | Primary power input; requires ≥4.7 µF ceramic bypass capacitor placed adjacent to pin to suppress high-frequency ripple. |
| 5 (FB) | Feedback input | Monitors output voltage via resistor divider; open-loop gain and phase margin designed for stability with standard 22 µF output capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Switches | P-MOS + N-MOS with RDS(ON) ≤0.28 Ω / ≤0.25 Ω eliminates external diode, improving efficiency by ~8% vs. asynchronous designs. |
| 100% Duty Cycle Operation | Enables dropout mode when VIN ≈ VOUT, maintaining regulation even as battery discharges below target output voltage. |
| Built-in Soft-start | Internal 1 ms ramp prevents output overshoot and limits inrush current into bulk output capacitance during startup. |
| Comprehensive Protection Suite | Includes over-current limit (1.5–2.0 A), short-circuit shutdown, thermal shutdown (+160°C), and UVLO (2.3 V) - no external components required. |
| Green & RoHS Compliance | Lead-free, halogen-free, antimony-free construction meets EU RoHS 2 (2011/65/EU) and Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb). |
Applications
| Smartphone Core Rail | Wearable Sensor Power |
|---|---|
Use Scenario: Powers application processor I/O or memory interface at 1.8 V from a 3.6 V nominal Li-ion battery. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.8 V at up to 1.2 A with fast load-transient response. Use Value: Maintains stable rail during burst-mode CPU activity; 95% efficiency extends battery runtime by reducing heat generation in space-constrained chassis. | Use Scenario: Supplies 3.3 V to BLE radio and inertial measurement unit (IMU) in fitness tracker with intermittent 500 mA peak loads. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across full battery range (4.2 V → 2.8 V), supporting 100% duty cycle in final discharge phase. Use Value: Eliminates need for external LDO post-regulation; soft-start prevents sensor initialization glitches during cold boot. |
| Portable Medical Monitor | Industrial Handheld Terminal |
Use Scenario: Generates 2.5 V analog front-end supply for ECG signal conditioning circuitry in battery-powered patient monitor. IC Role / Device Role / Timing Role: Low-noise, tightly regulated buck converter with ±2% output accuracy and <1 mV p-p ripple at 1.2 A. Use Value: Ensures ADC reference stability and minimizes offset drift in precision analog stages; thermal shutdown prevents fault propagation during extended clinical use. | Use Scenario: Provides 1.2 V core voltage to ARM Cortex-A53 SoC in ruggedized handheld terminal operating from 3.7 V Li-ion pack. IC Role / Device Role / Timing Role: Compact, high-current DC-DC solution with integrated MOSFETs and minimal external BOM (inductor + 2 caps + 2 resistors). Use Value: Reduces board area by >30% vs. discrete controller + external FET solution; UVLO prevents brownout-induced firmware corruption during battery swap. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3417KTR-G1 | Same SOT-23-5 package, 2 A output capability, higher RDS(ON) (0.32 Ω P-MOS), 1.5 MHz switching frequency. | Supports higher current loads but requires larger inductor and has lower peak efficiency (93%) at 1.2 A. | Select when future-proofing for >1.2 A loads or when higher thermal margin is needed despite slightly reduced efficiency. |
| MP2158GQZ-P | Monolithic 2 A buck in QFN-8 (2 mm × 2 mm), 2.2 MHz switching, integrated compensation, no external FB divider needed for fixed outputs. | Requires different PCB layout and lacks 100% duty cycle; optimized for ultra-compact fixed-output designs rather than adjustable rails. | Select when board space is critical and output voltage is fixed, accepting trade-off of no dropout mode and higher component cost. |
Compared with AP3407KTR-G1, AP3417KTR-G1 offers higher current headroom at modest efficiency penalty, while MP2158GQZ-P trades adjustability and dropout capability for smaller footprint and simplified design-making AP3407KTR-G1 optimal for cost-sensitive, adjustable, battery-sag-resilient portable power rails.
Availability
AP3407KTR-G1 is available at Aetrix Electronics and suitable for smartphone core rails, wearable sensor power, portable medical monitors, and industrial handheld terminals requiring stable component supply with known thermal and electrical behavior.
Supply support for AP3407KTR-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 ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP3407 product line delivers highly integrated, thermally robust synchronous buck converters targeting space-constrained, battery-powered portable electronics where efficiency, small footprint, and reliable dropout operation are essential.
FAQ
What is the minimum input voltage required for AP3407KTR-G1 to regulate a 1.2 V output?
The AP3407KTR-G1 requires a minimum input voltage of 2.5 V per datasheet specifications. For a 1.2 V output, regulation is maintained down to VIN = VOUT due to 100% duty cycle capability-so it can sustain 1.2 V output even as input drops to 1.2 V, though performance degrades below 2.5 V input (e.g., reduced efficiency, possible instability).
Can AP3407KTR-G1 operate without an external feedback resistor divider?
No-AP3407KTR-G1 is the adjustable version (AP3407, not AP3407A). It requires an external resistor divider from VOUT to FB and from FB to GND to set output voltage. Fixed-output variants like AP3407A connect FB directly to VOUT, but AP3407KTR-G1 mandates the divider for all output voltages except when configured for minimum 0.6 V.
What is the maximum allowable junction temperature before thermal shutdown activates?
Thermal shutdown activates at +160°C junction temperature, with +20°C hysteresis-meaning the device resumes operation only after junction temperature falls below +140°C. This threshold is fixed and non-adjustable, implemented via on-die thermal sensing circuitry independent of external components.
How does the EN pin behave during partial power loss or noisy supply conditions?
The EN pin has 1.5 V turn-on and 0.4 V turn-off thresholds with built-in hysteresis, providing noise immunity against supply ripple. When VIN sags near UVLO (2.3 V), EN remains asserted until VIN recovers above 2.3 V, preventing erratic toggling. Pulling EN below 0.4 V guarantees shutdown with <1 µA supply current, isolating the regulator from weak sources.
AP3407KTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP3407KTR-G1 FAQ
1.How can I place an order for AP3407KTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3407KTR-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 AP3407KTR-G1 reliable?
The price and inventory of AP3407KTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3407KTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3407KTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3407KTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3407KTR-G1?
AP3407KTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3407KTR-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 AP3407KTR-G1?
For technical support, including AP3407KTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3407KTR-G1 requirements.
6.How does Aetrix verify that AP3407KTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3407KTR-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 AP3407KTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3407KTR-G1?
All AP3407KTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3407KTR-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 AP3407KTR-G1 part is unused and in its original packaging.
Return procedure for AP3407KTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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