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Microchip Technology TC1303B-IA0EUNTR
- Part No.:
- TC1303B-IA0EUNTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-IA0EUNTR.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,123
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Product details
Overview
TC1303B-IA0EUNTR 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 power-good monitoring specifically of the LDO output (VOUT2). It delivers 1.8 V at 500 mA on VOUT1 and 3.3 V at 300 mA on VOUT2, operates from 2.7–5.5 V input, and features 65 µA typical quiescent current and 2.0 MHz fixed-frequency PWM switching - ideal for battery-powered portable computing and USB-powered devices.
For engineers reviewing the TC1303B-IA0EUNTR datasheet, TC1303B-IA0EUNTR pinout, TC1303B-IA0EUNTR application, or TC1303B-IA0EUNTR equivalent, key selection criteria include its LDO-monitored PG output, independent SHDN1/SHDN2 control, 137 mV typical dropout at 200 mA, push-pull PG configuration, and DFN-10 (3×3 mm) package compatibility with space-constrained embedded designs.
Technical Context
The TC1303B-IA0EUNTR implements a synchronous buck stage with PFM/PWM auto-transition for light-load efficiency, paired with an internally compensated LDO requiring only a 1 µF ceramic output capacitor. Its power-good circuitry actively monitors VOUT2 regulation with 94% threshold high and 89% threshold low, delivering a push-pull PG signal with 262 ms nominal active timeout and 165 µs delay.
It integrates undervoltage lockout (2.55 V nominal), thermal shutdown (165 °C), and overcurrent protection on both outputs. The device supports sequenced startup/shutdown only in TC1304 variants; TC1303B uses independent enable inputs (SHDN1 for buck, SHDN2 for LDO), enabling flexible power sequencing via external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 500 mA @ 1.8 V; adjustable 0.8–4.5 V or fixed 0.8/1.2/1.5/1.8/2.5/3.3 V; 2.0 MHz PWM with automatic PFM transition |
| Output 2 (LDO) | 300 mA @ 3.3 V; fixed 1.5/1.8/2.5/3.3 V options; 137 mV typical dropout @ 200 mA |
| Power-Good (PG) | Push-pull output monitoring VOUT2 only; 94% VOUT2 threshold high, 89% low; 262 ms active timeout, 165 µs delay |
| Quiescent Current | 65 µA typical total IQ (buck + LDO active); 38 µA buck-only, 46 µA LDO-only |
| Input Voltage Range | 2.7 V to 5.5 V; UVLO at 2.55 V nominal with 200 mV hysteresis |
| Operating Temperature | -40°C to +125°C junction; rated for industrial and extended-temperature portable applications |
| Package | 10-pin 3×3 mm DFN; exposed pad tied to AGND; θJA = 41°C/W (4-layer board) |
Pinout & Package
TC1303B-IA0EUNTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. Pin numbering follows standard DFN orientation (pin 1 top-left, counterclockwise).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | LDO shutdown input: logic-high (>45% VIN) enables VOUT2; logic-low (<15% VIN) disables it |
| 2 | VIN2 | LDO input supply; must be tied closely to VIN1; accepts 2.7–5.5 V input |
| 3 | VOUT2 | Regulated 3.3 V LDO output; requires ≥1 µF ceramic capacitor to AGND |
| 4 | PG | Push-pull power-good output indicating VOUT2 regulation (94%–96% of nominal) |
| 5 | AGND | Analog ground reference; tie to system analog ground plane; connects to EP |
| 6 | PGND | Power ground for buck switch node; separate from AGND to minimize noise coupling |
| 7 | LX | Buck switch node; connects to external 4.7 µH inductor and catch diode/integrated FET path |
| 8 | VIN1 | Buck input supply; tied to VIN2 on PCB; 2.7–5.5 V input range |
| 9 | SHDN1 | Buck shutdown input: logic-high enables VOUT1; logic-low disables buck regulator |
| 10 | VFB1/VOUT1 | Feedback/sense pin: for fixed 1.8 V output (as in IA0EUNTR), connect directly to VOUT1 |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-output control | Separate SHDN1 (buck) and SHDN2 (LDO) pins enable precise sequencing and fault isolation without external logic |
| Low-noise, high-efficiency buck | 2.0 MHz fixed-frequency PWM reduces EMI and allows small 4.7 µH inductor; >90% efficiency at 500 mA load |
| LDO simplicity | Internally compensated; stable with only 1 µF ceramic output capacitor - cuts BOM cost and board area |
| LDO-monitored power-good | Push-pull PG output tied exclusively to VOUT2 regulation status - simplifies reset timing for peripherals powered by LDO |
| Robust protection suite | Integrated UVLO, thermal shutdown (165 °C), overcurrent, and short-circuit protection on both outputs |
Applications
| USB-Powered Portable Instrument | Handheld Medical Device |
|---|---|
|
Use Scenario: A portable blood glucose meter powered via USB 5 V input requiring clean 3.3 V for MCU and 1.8 V for sensor interface. IC Role / Device Role / Timing Role: TC1303B-IA0EUNTR provides regulated dual-rail power with LDO-monitored PG asserting processor reset until 3.3 V stabilizes. Use Value: 137 mV LDO dropout ensures stable 3.3 V output even as USB voltage sags to 4.2 V; 65 µA IQ extends battery life during standby. |
Use Scenario: An ultrasound probe with real-time DSP and analog front-end needing tightly regulated, low-noise supplies. IC Role / Device Role / Timing Role: TC1303B-IA0EUNTR delivers 1.8 V (DSP core) and 3.3 V (AFE bias) with independent shutdown for power domain isolation. Use Value: Internally compensated buck and LDO eliminate external compensation components; push-pull PG eliminates need for external pull-up resistor. |
| Industrial Handheld Terminal | Wearable Health Monitor |
|
Use Scenario: Ruggedized barcode scanner operating across -40°C to +85°C ambient with Li-ion battery input. IC Role / Device Role / Timing Role: TC1303B-IA0EUNTR manages battery-to-rail conversion while maintaining regulation under wide temperature and load transients. Use Value: Guaranteed operation to +125°C junction enables reliable performance in sealed enclosures; 2.0 MHz switching avoids AM radio band interference. |
Use Scenario: Compact fitness tracker using single-cell Li-ion (2.7–4.2 V) to power BLE SoC and optical sensor. IC Role / Device Role / Timing Role: TC1303B-IA0EUNTR supplies 1.8 V (SoC core) and 3.3 V (LED driver) with ultra-low IQ to maximize runtime. Use Value: 65 µA total IQ minimizes standby drain; 1 µF LDO output cap fits tight form factor; DFN-10 footprint saves PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303C-IA0EUNTR | Monitors both VOUT1 and VOUT2 for PG assertion; same pinout and electrical specs otherwise | Required where system reset must wait for stabilization of *both* rails (e.g., FPGA + I/O bank) | Select when dual-rail PG monitoring is mandatory; not drop-in if only LDO PG is needed |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO); higher IQ (120 µA); QFN-24 package; no LDO-monitored PG | Used in complex SoC platforms needing >2 rails; lacks dedicated LDO PG signal | Choose for multi-rail SoC power; avoid if LDO-specific reset timing or low IQ is critical |
Compared with TC1303C-IA0EUNTR and TPS65023RGZR, TC1303B-IA0EUNTR uniquely provides LDO-only power-good with push-pull drive in a minimal 10-pin DFN, making it optimal for cost-sensitive, space-constrained designs where only the auxiliary rail governs system reset timing.
Availability
TC1303B-IA0EUNTR is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial portable terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-IA0EUNTR 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, and mixed-signal semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 family was designed to deliver highly integrated, low-quiescent-current dual-rail power solutions for portable and battery-operated applications where board space, efficiency, and precise power sequencing are critical.
FAQ
What output voltages does the TC1303B-IA0EUNTR provide?
The TC1303B-IA0EUNTR is factory-configured to deliver 1.8 V at up to 500 mA from its synchronous buck regulator (VOUT1) and 3.3 V at up to 300 mA from its low-dropout linear regulator (VOUT2). These fixed outputs are confirmed in the device's part number suffix "IA0EUNTR", where "IA" denotes 1.8 V/3.3 V configuration and "EUNTR" indicates DFN-10 packaging.
How does the power-good (PG) output function on the TC1303B-IA0EUNTR?
The TC1303B-IA0EUNTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value and remains high for a nominal 262 ms timeout. The PG signal deasserts when VOUT2 falls below 89% of nominal, with 2% hysteresis. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored, open-drain) and TC1303C (dual-monitored).
What is the thermal performance of the TC1303B-IA0EUNTR in its DFN package?
In its 10-pin 3×3 mm DFN package with exposed pad tied to AGND, the TC1303B-IA0EUNTR achieves a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias. It incorporates thermal shutdown at 165°C with 10°C hysteresis, ensuring safe operation under sustained high-load or elevated ambient conditions up to +125°C junction temperature.
Can the TC1303B-IA0EUNTR operate from a single 3.3 V input source?
No - the TC1303B-IA0EUNTR requires a minimum input voltage of 2.7 V, but its buck regulator cannot generate 1.8 V from 3.3 V with sufficient headroom for stable operation across temperature and load. For 1.8 V output, VIN must be ≥3.6 V (accounting for buck dropout and regulation margin); the LDO (3.3 V output) also requires VIN ≥3.6 V to maintain regulation under full 300 mA load given its 137 mV typical dropout.
What external components are required for basic operation of the TC1303B-IA0EUNTR?
For stable operation, the TC1303B-IA0EUNTR requires: (1) a 4.7 µH power inductor between LX and VOUT1, (2) a 4.7 µF input capacitor (VIN1/VIN2), (3) a 4.7 µF buck output capacitor (VOUT1), and (4) a 1 µF ceramic capacitor on VOUT2. No external compensation components are needed - both regulators are internally compensated per the datasheet.
TC1303B-IA0EUNTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-MSOP
TC1303B-IA0EUNTR FAQ
1.How can I place an order for TC1303B-IA0EUNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-IA0EUNTR 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-IA0EUNTR reliable?
The price and inventory of TC1303B-IA0EUNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-IA0EUNTR is usually 5 days.
3.What payment methods are accepted for TC1303B-IA0EUNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-IA0EUNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-IA0EUNTR?
TC1303B-IA0EUNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-IA0EUNTR 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-IA0EUNTR?
For technical support, including TC1303B-IA0EUNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-IA0EUNTR requirements.
6.How does Aetrix verify that TC1303B-IA0EUNTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-IA0EUNTR 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-IA0EUNTR meets industry standards.
7.What is the process for return or replacement of TC1303B-IA0EUNTR?
All TC1303B-IA0EUNTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-IA0EUNTR, 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-IA0EUNTR part is unused and in its original packaging.
Return procedure for TC1303B-IA0EUNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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