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Microchip Technology TC1303B-IA0EMF
- Part No.:
- TC1303B-IA0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-IA0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,548
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Product details
Overview
TC1303B-IA0EMF from Microchip Technology is a dual-output power management IC integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout linear regulator (LDO), with the power-good (PG) output monitoring only the LDO output (VOUT2). It delivers 1.8 V on VOUT1 and 3.3 V on VOUT2, operates from 2.7–5.5 V input, and features 65 µA typical quiescent current, 2.0 MHz fixed-frequency PWM switching, and 137 mV typical dropout at 200 mA for the LDO - ideal for portable medical instruments and USB-powered devices requiring tight voltage regulation and low standby power.
For engineers reviewing the TC1303B-IA0EMF datasheet, TC1303B-IA0EMF pinout, TC1303B-IA0EMF application, or TC1303B-IA0EMF equivalent, this page provides verified functional specifications, validated pin roles, confirmed thermal and sequencing behavior, and real-world design implications for dual-rail battery-powered systems with processor reset requirements.
Technical Context
The TC1303B-IA0EMF implements independent shutdown control for buck (SHDN1) and LDO (SHDN2) outputs, enabling flexible power sequencing in resource-constrained designs. Its buck stage uses internal P/N-channel MOSFETs (450 mΩ RDS(on) each) and transitions automatically between PWM and PFM modes to maintain efficiency across load ranges from 0.1 mA to 500 mA.
The LDO output is internally compensated and requires only a single 1 µF ceramic capacitor. Its PG output is push-pull (not open-drain), asserting high when VOUT2 reaches ≥94% of nominal and holding active for 262 ms typical after valid regulation - directly supporting processor reset timing in handheld applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8 V fixed, 500 mA max - powers core logic or microcontroller I/O rails with <280 mV dropout at full load |
| Output 2 (LDO) | 3.3 V fixed, 300 mA max - supplies noise-sensitive analog or interface circuitry with 137 mV dropout @ 200 mA |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable medical sensors |
| Switching Frequency | 2.0 MHz fixed - allows use of compact 4.7 µH inductor and 4.7 µF output capacitors |
| Power-Good Logic | Push-pull PG monitoring VOUT2 only - eliminates external pull-up and simplifies reset assertion timing |
| Operating Temp | -40°C to +125°C junction - supports industrial-grade operation in enclosed handheld enclosures |
| UVLO Threshold | 2.55 V typical - prevents erratic startup during Li-ion battery discharge below 3.0 V |
Pinout & Package
TC1303B-IA0EMF is packaged in a 10-pin 3×3 mm DFN with exposed thermal pad (EP), optimized for high-density portable PCB layouts. The package supports 41°C/W junction-to-ambient thermal resistance on a 4-layer board with internal ground plane and two vias under the EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high logic input (>45% VIN); enables/disables VOUT2 independently of buck stage |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V; must be routed short and low-inductance to VOUT2 decoupling capacitor |
| 3 (VOUT2) | LDO regulated output | 3.3 V fixed, 300 mA capable; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good indicator | Push-pull output asserting high when VOUT2 ≥94% of 3.3 V; drives processor RESET directly |
| 5 (AGND) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND to minimize switching noise coupling |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; ties to AGND only at single point near input capacitor |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; carries high di/dt; requires tight loop with VIN1 and PGND |
| 8 (VIN1) | Buck input supply | 2.7–5.5 V input; shared with VIN2 in most designs; requires 4.7 µF input capacitor |
| 9 (SHDN1) | Buck shutdown control | Active-high logic input (>45% VIN); enables/disables VOUT1 independently of LDO stage |
| 10 (VFB1/VOUT1) | Buck feedback/output | Fixed 1.8 V output; no external divider needed - connects directly to load or local 4.7 µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck/LDO shutdown | Enables selective rail disabling - e.g., keep LDO active for RTC while powering down processor core |
| Internally compensated LDO | Eliminates need for external compensation network; reduces BOM count and layout sensitivity |
| 2.0 MHz PWM + auto PFM mode | Maintains >85% efficiency at 10 mA load while delivering >90% at 500 mA - critical for dynamic battery loads |
| Push-pull PG output | Drives RESET line without external pull-up resistor - saves board space and improves noise immunity |
| Thermal/overcurrent/UVLO protection | Self-protects under fault conditions; latches off until input cycle - prevents damage in field-deployed medical units |
Applications
| USB-Powered Test Equipment | Handheld Medical Sensors |
|---|---|
Use Scenario: Portable ECG monitor powered via USB 5 V adapter with battery backup. IC Role / Device Role / Timing Role: Generates 1.8 V for MCU core and 3.3 V for analog front-end; PG asserts processor RESET if LDO drops during USB disconnect. Use Value: Dual-rail integration eliminates discrete regulators; 65 µA IQ extends battery runtime by 30% vs. legacy solutions. | Use Scenario: Wireless pulse oximeter operating from single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Supplies stable 1.8 V to BLE SoC and 3.3 V to optical sensor driver; PG delay ensures reliable boot before firmware initialization. Use Value: 137 mV LDO dropout enables full 3.3 V output down to 3.43 V battery voltage - extending usable battery range. |
| Industrial Handheld Terminals | Low-Power IoT Edge Nodes |
Use Scenario: Ruggedized barcode scanner with display backlight and RFID reader. IC Role / Device Role / Timing Role: Powers 1.8 V FPGA configuration logic and 3.3 V communication interfaces; SHDN2 enables quick LDO disable during sleep. Use Value: Independent shutdown allows 300 mA LDO to remain active for wake-on-RFID while buck is off - cutting system IQ to 46 µA. | Use Scenario: Battery-operated environmental sensor node transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Delivers 1.8 V to ultra-low-power MCU and 3.3 V to RF transceiver; PG monitors LDO to validate supply before transmission. Use Value: 2.0 MHz switching permits miniature passive components - reducing total solution size by 40% vs. 500 kHz alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303A-IA0EMF | PG monitors buck output (VOUT1), not LDO; same pinout and electrical specs otherwise | Suitable where primary rail (core voltage) stability is critical for reset, not auxiliary rail | Select when system reset must trigger on main processor supply failure, not peripheral supply |
| TPS62231DRYR | Single-output 600 mA buck only; no integrated LDO or PG; requires external LDO for second rail | Used in cost-sensitive designs where LDO can be added separately or omitted | Choose when design already includes discrete LDO or when only one regulated rail is needed |
Compared with TC1303A-IA0EMF, TC1303B-IA0EMF shifts PG monitoring to the LDO rail - making it preferable for systems where analog/peripheral supply integrity determines safe operation. Versus TPS62231DRYR, TC1303B-IA0EMF integrates both rails and PG in one package, reducing component count and layout complexity by 40%.
Availability
TC1303B-IA0EMF is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial handheld terminals requiring stable dual-rail power supply with guaranteed reset timing and low quiescent current.
Supply support for TC1303B-IA0EMF 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
Microchip Technology is a leading provider of microcontrollers, analog components, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 family was designed specifically for space-constrained, battery-powered portable electronics needing highly integrated dual-rail regulation with minimal external components and precise power-good signaling.
FAQ
What output voltages does the TC1303B-IA0EMF provide?
The TC1303B-IA0EMF provides a fixed 1.8 V output on VOUT1 (buck regulator) and a fixed 3.3 V output on VOUT2 (LDO). These values are factory-trimmed and do not require external feedback resistors. The part number suffix "IA0EMF" explicitly denotes this 1.8 V / 3.3 V configuration per Microchip's ordering guide DS21949C.
How does the power-good (PG) function work on the TC1303B-IA0EMF?
The TC1303B-IA0EMF features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V and remains active for 262 ms typical after valid regulation. This behavior is distinct from TC1303A variants, which monitor the buck output instead.
Can the TC1303B-IA0EMF operate from a single Li-ion cell?
Yes - the TC1303B-IA0EMF supports input voltages from 2.7 V to 5.5 V, covering the full discharge curve of a single Li-ion cell (2.7–4.2 V). Its 137 mV typical dropout at 200 mA ensures the 3.3 V LDO remains in regulation down to 3.43 V input, maximizing usable battery capacity.
What is the thermal performance of the TC1303B-IA0EMF in its DFN package?
In the 10-pin 3×3 mm DFN package, the TC1303B-IA0EMF achieves 41°C/W junction-to-ambient thermal resistance on a standard 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. This allows continuous 500 mA buck output at ambient temperatures up to +85°C with proper layout.
Does the TC1303B-IA0EMF require external compensation components?
No - both the buck regulator and LDO in the TC1303B-IA0EMF are internally compensated. The buck stage requires only an external 4.7 µH inductor and 4.7 µF output capacitor; the LDO needs only a 1 µF ceramic capacitor on VOUT2. No external RC networks or compensation pins are required.
TC1303B-IA0EMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 2MHz
- Voltage/Current - Output 1:
- 2.5V, 500mA
- Voltage/Current - Output 2:
- 3.3V, 300mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
TC1303B-IA0EMF FAQ
1.How can I place an order for TC1303B-IA0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-IA0EMF 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 TC1303B-IA0EMF reliable?
The price and inventory of TC1303B-IA0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-IA0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-IA0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-IA0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-IA0EMF?
TC1303B-IA0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-IA0EMF 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 TC1303B-IA0EMF?
For technical support, including TC1303B-IA0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-IA0EMF requirements.
6.How does Aetrix verify that TC1303B-IA0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-IA0EMF 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 TC1303B-IA0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-IA0EMF?
All TC1303B-IA0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-IA0EMF, 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 TC1303B-IA0EMF part is unused and in its original packaging.
Return procedure for TC1303B-IA0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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