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Diodes Incorporated AP1603WG-7
- Part No.:
- AP1603WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-6
- Datasheet:
-
AP1603WG-7.pdf
- Description:
- IC REG BOOST ADJ 200MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
AP1603WG-7 from Diodes Incorporated is a high-efficiency, PFM-controlled step-up DC-DC converter in SOT26 package, delivering fixed 3.3V output from input as low as 0.9V start-up voltage, with 90% typical efficiency at 100mA load and 150kHz max switching frequency. It integrates N/P-channel MOSFETs, 1.22V reference, and requires only four external components for operation in space-constrained portable devices like wireless microphones and electronic cameras.
For engineers reviewing the AP1603WG-7 datasheet, AP1603WG-7 pinout, AP1603WG-7 application, or AP1603WG-7 equivalent, key selection criteria include guaranteed sub-0.9V start-up capability, low 16µA operating current into OUT, fixed 3.3V output regulation (±3.9% over temp), SOT26 thermal and footprint constraints, and shutdown threshold referenced to VOUT rather than ground.
Technical Context
The AP1603WG-7 employs Pulse Frequency Modulation with constant on-time (~4µs) and variable off-time to maintain regulation under light loads while minimizing quiescent current. Its error amplifier compares FB voltage against an internal 1.22V reference, enabling adjustable output via external resistors or fixed 3.3V/5V outputs using direct FB-to-OUT or FB-to-GND configurations.
Internal power switches feature 0.6Ω typical RDS(ON) for both NFET and PFET, supporting up to 150mA steady-state output current at 3.3V. The LX pin handles bidirectional switching with 0.35A current limit, and SHDN operates as a VOUT-referenced logic input-high (>0.8×VOUT) enables operation, low (<0.2×VOUT) forces shutdown with <1µA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.9% (3.17–3.43V) ensures stable rail for 3.3V logic without feedback resistor network. |
| Start-Up Voltage | 0.9V typ. (with 1N5819 diode) enables operation from single NiMH or Li-ion cell at deep discharge. |
| Efficiency | 90% typ. at VIN=2.4V, VOUT=3.3V, ILOAD=100mA reduces thermal load and extends battery runtime. |
| Switching Frequency | Up to 150kHz max enables use of compact 22µH inductors and low-ESR ceramic capacitors. |
| Quiescent Current | 16µA typ. into OUT pin minimizes no-load drain on primary battery in always-on portable systems. |
| Shutdown Current | 0.1µA typ. at SHDN=GND preserves battery charge during extended standby periods. |
| RDS(ON) | 0.6Ω typ. for integrated NFET/PFET lowers conduction loss and improves light-load efficiency. |
Pinout & Package
SOT26 package: 6-pin, lead-free, green-compliant surface-mount package measuring 2.80mm × 2.90mm × 1.10mm (L×W×H), optimized for high-density PCB layouts in handheld electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – LX | Power switch drain node | Connects to inductor and Schottky diode anode; carries pulsed current up to 0.35A with 0.3V max dropout. |
| 2 – GND | Analog and power ground reference | Common return path for REF, FB, and internal circuitry; must be low-impedance for stable regulation. |
| 3 – OUT | Regulated power output & bootstrap supply | Delivers 3.3V to load; also powers internal bias circuits-requires ≥47µF low-ESR output capacitance. |
| 4 – REF | 1.22V precision reference output | Bypassed with 0.1µF capacitor; used as feedback reference when FB is connected to divider network. |
| 5 – SHDN | VOUT-referenced enable control | Logic-high >0.8×VOUT enables converter; logic-low <0.2×VOUT disables with µA-level leakage. |
| 6 – FB | Feedback input for output regulation | Connected to OUT for fixed 3.3V mode or to resistor divider for adjustable output; senses 1.22V reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-0.9V start-up capability | Enables reliable power-up from depleted single-cell batteries without external boost assist circuitry. |
| PFM control with constant on-time | Maintains high efficiency across 10µA–150mA load range by varying switching frequency instead of duty cycle. |
| Integrated dual MOSFET switch | Eliminates need for external high-side/low-side drivers and reduces BOM count and layout area. |
| Low-noise 3.3V fixed output | Delivers regulated rail with <10mVpp ripple (typ.) using standard 47µF + 47µF output capacitance. |
| VOUT-referenced SHDN | Removes dependency on system ground integrity-enables robust enable/disable control in noisy battery-ground environments. |
Applications
| Pagers | Electronic Cameras |
|---|---|
Use Scenario: Low-power alphanumeric display and RF paging receiver powered by single AA/AAA alkaline cell. IC Role / Device Role / Timing Role: Primary 3.3V system rail generator maintaining regulation down to 0.9V input during battery depletion. Use Value: Extends usable battery life by 22% versus linear regulators due to 90% PFM efficiency at 20mA load. | Use Scenario: Image sensor and flash LED driver subsystem in compact digital camera requiring clean 3.3V supply. IC Role / Device Role / Timing Role: Fixed-output boost converter supplying noise-sensitive analog front-end and CMOS image sensor interface. Use Value: Low 10mVpp output ripple prevents image noise artifacts; SOT26 footprint fits within 8mm² board area budget. |
| Wireless Microphones | Pocket Organizers |
Use Scenario: UHF transmitter module powered by single lithium coin cell with intermittent 100ms transmit bursts. IC Role / Device Role / Timing Role: High-efficiency voltage booster enabling consistent 3.3V RF amplifier bias despite 1.1–2.8V battery sag. Use Value: 16µA quiescent current extends shelf life beyond 18 months; PFM avoids audible switching noise in audio band. | Use Scenario: Handheld PDA with LCD backlight, touch controller, and flash memory-all requiring stable 3.3V rail. IC Role / Device Role / Timing Role: Main system power converter supporting dynamic load steps from 50µA (sleep) to 120mA (backlight+CPU). Use Value: Fast PFM response (<10µs transient recovery) prevents brown-out during backlight turn-on events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61099YFFR | Higher 0.7V start-up, 92% efficiency, but requires external compensation and larger 1.5µH inductor. | Targets ultra-low-power IoT sensors; lacks VOUT-referenced SHDN and fixed 3.3V option. | Select if >200mA output current or tighter output tolerance (±1%) is required; accept added design complexity. |
| MAX1703ESA+ | Fixed 3.3V output, 0.95V start-up, but uses PWM (not PFM) and draws 25µA quiescent current. | Optimized for industrial handhelds with higher ambient temperature; no green/RoHS-compliant variant available. | Select if continuous conduction mode is mandatory or if legacy MAXIM design reuse is prioritized over battery life. |
Compared with TPS61099YFFR and MAX1703ESA+, the AP1603WG-7 delivers superior light-load efficiency via PFM, simpler 4-component design, and guaranteed sub-0.9V start-up-making it optimal for cost-sensitive, battery-limited consumer portables where minimal BOM and longest runtime are critical.
Availability
AP1603WG-7 is available at Aetrix Electronics and suitable for pagers, electronic cameras, and wireless microphones requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for AP1603WG-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 computing markets.
The AP1603 belongs to Diodes' low-voltage boost converter product line, engineered specifically for single-cell battery-powered portable electronics demanding ultra-low start-up voltage, minimal external components, and green-compliant packaging.
FAQ
What is the minimum input voltage required for AP1603WG-7 to start regulating?
The AP1603WG-7 guarantees start-up from 0.9V input when used with an external 1N5819 Schottky diode between VIN and VOUT. Without the diode, start-up is specified at 1.1V. This capability allows operation from deeply discharged NiMH or Li-ion cells, making it ideal for battery-critical portable designs where every millivolt counts.
Can AP1603WG-7 be configured for adjustable output voltage?
Yes-by connecting FB to a resistor divider between OUT and GND, the AP1603WG-7 supports adjustable output from 2V to 5.5V. The internal 1.22V reference is compared to the FB voltage, so VOUT = 1.22V × (1 + R1/R2). For fixed 3.3V, connect FB directly to OUT; for fixed 5V, connect FB to GND per the datasheet's typical application circuits.
Why does AP1603WG-7 use VOUT-referenced SHDN instead of ground-referenced control?
The VOUT-referenced SHDN eliminates sensitivity to ground bounce or IR drop in high-current battery paths. Since the threshold is defined as a percentage of VOUT (e.g., >0.8×VOUT to enable), it remains stable even as battery voltage sags or PCB ground impedance rises-ensuring predictable enable/disable behavior in real-world portable layouts with shared return paths.
What external components are mandatory for basic AP1603WG-7 operation?
Four mandatory components: a 22µH power inductor between VIN and LX, a Schottky diode (e.g., 1N5819) from LX to OUT, a 0.1µF ceramic capacitor from REF to GND, and a 47µF low-ESR output capacitor from OUT to GND. Optional components include a second 47µF output cap for improved ripple suppression and input bypass capacitance depending on source impedance.
AP1603WG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.1V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V (3.3V, 5V)
- Voltage - Output (Max):
- 5.8V (Switch)
- Current - Output:
- 200mA (Switch)
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
AP1603WG-7 FAQ
1.How can I place an order for AP1603WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1603WG-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 AP1603WG-7 reliable?
The price and inventory of AP1603WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1603WG-7 is usually 5 days.
3.What payment methods are accepted for AP1603WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1603WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1603WG-7?
AP1603WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1603WG-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 AP1603WG-7?
For technical support, including AP1603WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1603WG-7 requirements.
6.How does Aetrix verify that AP1603WG-7 is sourced from the original manufacturer or authorized distributors?
All AP1603WG-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 AP1603WG-7 meets industry standards.
7.What is the process for return or replacement of AP1603WG-7?
All AP1603WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP1603WG-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 AP1603WG-7 part is unused and in its original packaging.
Return procedure for AP1603WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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