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Microchip Technology TC1303B-IA0EUN
- Part No.:
- TC1303B-IA0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-IA0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,793
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Product details
Overview
TC1303B-IA0EUN 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 focused on the LDO output. It delivers fixed 1.8 V on VOUT1 and 3.3 V on VOUT2, operates from 2.7–5.5 V input, achieves >90% typical efficiency at heavy load, and features 65 µA total quiescent current. It is designed for portable battery-powered systems requiring sequenced dual-rail supplies.
For engineers reviewing the TC1303B-IA0EUN datasheet, TC1303B-IA0EUN pinout, TC1303B-IA0EUN application, or TC1303B-IA0EUN equivalent, key selection considerations include its LDO-monitored PG output, independent shutdown control per rail, 2.0 MHz fixed-frequency PWM operation, 137 mV typical dropout at 200 mA (VOUT2), and compatibility with 1 µF ceramic output capacitors on both outputs.
Technical Context
The TC1303B-IA0EUN implements a synchronous buck converter with PFM/PWM auto-transition and an internally compensated LDO, both fully integrated with undervoltage lockout (UVLO), overtemperature protection, and short-circuit limiting. Its power-good (PG) signal is a push-pull output actively monitoring only the LDO output (VOUT2) with 94% regulation threshold and 300 ms delay-distinct from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored).
It supports independent enable control: SHDN1 disables the buck regulator while SHDN2 disables the LDO, enabling flexible power sequencing. The buck stage uses a 2.0 MHz fixed-frequency oscillator with typical RDS(on) of 450 mΩ for both high- and low-side MOSFETs, and the LDO maintains ±0.3% output voltage tolerance across -40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | Fixed 1.8 V @ 500 mA max; 2.0 MHz PWM switching; >90% typical efficiency at full load; 0.5 ms typical startup time |
| Output 2 (LDO) | Fixed 3.3 V @ 300 mA max; 137 mV typical dropout @ 200 mA; ±0.3% output voltage tolerance; 1 µF min ceramic output capacitor |
| Power-Good (PG) | Push-pull output monitoring VOUT2 only; asserts when VOUT2 ≥ 94% of nominal; 300 ms delay; active-high logic compatible with processor reset inputs |
| Quiescent Current | 65 µA typical total device IQ (buck + LDO enabled); 38 µA buck-only IQ; 46 µA LDO-only IQ |
| Input Voltage Range | 2.7 V to 5.5 V common input for both VIN1 and VIN2; UVLO threshold 2.55 V (typical) with 200 mV hysteresis |
| Thermal & Protection | -40°C to +125°C operating junction temperature; thermal shutdown at 165°C (10°C hysteresis); output short-circuit and overcurrent protection on both rails |
Pinout & Package
TC1303B-IA0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), pin-compatible with the MSOP variant. The exposed pad must be connected to AGND for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | LDO shutdown control: logic-high (>45% VIN) enables VOUT2; logic-low (<15% VIN) forces LDO off |
| 2 | VIN2 | LDO input supply: connects to same source as VIN1; requires local 4.7 µF input capacitor |
| 3 | VOUT2 | 3.3 V regulated LDO output: requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 | PG | Push-pull power-good output: indicates VOUT2 regulation status; drives processor RESET directly |
| 5 | AGND | Analog ground reference: dedicated low-noise return path for feedback and regulation circuitry |
| 6 | PGND | Power ground: high-current return for buck switch node (LX); must be routed separately from AGND |
| 7 | LX | Buck switch node: connects to external 4.7 µH inductor; requires low-inductance layout to minimize EMI |
| 8 | VIN1 | Buck input supply: shares input source with VIN2; requires same 4.7 µF input capacitor |
| 9 | SHDN1 | Buck shutdown control: logic-high enables VOUT1; logic-low disables buck regulator independently |
| 10 | VFB1/VOUT1 | Buck feedback/sense: tied directly to 1.8 V output (fixed version); no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-rail shutdown | SHDN1 and SHDN2 allow separate control of buck and LDO outputs-enabling precise power sequencing without external logic |
| LDO-monitored power-good | PG pin is push-pull and tracks only VOUT2 regulation (not VOUT1), providing deterministic reset timing for LDO-powered peripherals |
| Ultra-low quiescent current | 65 µA total IQ enables >10-year battery life in always-on portable devices with light-load duty cycles |
| Internally compensated design | Eliminates need for external compensation components on either regulator-reducing BOM count and board area |
| Robust protection suite | Integrated UVLO, thermal shutdown (165°C), and output short-circuit protection prevent damage during fault conditions |
Applications
| USB-Powered Portable Instrument | Handheld Medical Device |
|---|---|
|
Use Scenario: Battery-powered glucose meter with microcontroller (1.8 V core) and LCD backlight driver (3.3 V bias). IC Role / Device Role / Timing Role: Dual-rail PMIC supplying processor core voltage and analog front-end bias; PG asserts after LDO stabilizes to release MCU from reset. Use Value: Single-chip solution eliminates discrete regulators and sequencing ICs; 1 µF LDO output cap reduces footprint by >40% vs. legacy designs. |
Use Scenario: Portable ECG monitor using rechargeable Li-ion (3.0–4.2 V) powering ARM Cortex-M4 (1.8 V) and signal chain ADC/DAC (3.3 V). IC Role / Device Role / Timing Role: Primary power manager delivering tightly regulated, low-noise rails; PG provides clean reset to ensure synchronized boot of digital and analog subsystems. Use Value: 137 mV LDO dropout preserves runtime at end-of-battery; 65 µA IQ extends standby time between patient measurements. |
| Low-Power Cellular IoT Node | Industrial Handheld Scanner |
|
Use Scenario: NB-IoT asset tracker with GSM modem (3.3 V), ultra-low-power MCU (1.8 V), and wake-up timer. IC Role / Device Role / Timing Role: Power controller enabling deep-sleep mode via independent SHDN1/SHDN2; PG used to synchronize modem initialization after LDO ramp. Use Value: Independent shutdown cuts system IQ to sub-µA levels; 2.0 MHz switching allows use of tiny 4.7 µH inductors for compact form factor. |
Use Scenario: Rugged barcode scanner with ARM processor (1.8 V), CMOS image sensor (3.3 V), and motor driver interface. IC Role / Device Role / Timing Role: Centralized power hub managing rail sequencing during cold start and brown-out recovery; PG ensures sensor firmware loads only after stable 3.3 V is confirmed. Use Value: -40°C to +125°C junction rating supports operation in uncontrolled environments; thermal shutdown prevents latch-up under sustained high ambient. |
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-IA0EUN | PG monitors buck output (VOUT1) instead of LDO; PG is open-drain, not push-pull | Suitable where processor reset must be tied to core rail stability-not auxiliary bias rail | Select when system reset timing depends on 1.8 V rail settling, not 3.3 V rail |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO); higher IQ (120 µA); 2.25 MHz switching; QFN-24 package | Supports more complex SoC power trees; requires larger PCB area and additional external components | Choose when additional rails or higher integration (e.g., I²C control) are required beyond dual fixed outputs |
Compared with TC1303A-IA0EUN and TPS65023RGZR, TC1303B-IA0EUN uniquely offers LDO-targeted push-pull PG in a minimal 10-pin DFN-optimizing for cost-sensitive, space-constrained applications where 3.3 V rail integrity dictates system readiness.
Availability
TC1303B-IA0EUN is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TC1303B-IA0EUN 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 engineered specifically for space- and power-constrained portable electronics, delivering dual-rail regulation with minimal external components and industry-leading quiescent current for extended battery life.
FAQ
What output voltages does the TC1303B-IA0EUN provide?
The TC1303B-IA0EUN provides fixed 1.8 V on its buck output (VOUT1) and fixed 3.3 V on its LDO output (VOUT2). These values are factory-trimmed and do not require external resistive feedback networks. The part number suffix "IA0EUN" explicitly denotes this 1.8 V / 3.3 V configuration, verified in Microchip's DS21949C datasheet revision C, page 5 (Typical Application Circuits) and page 8 (Electrical Characteristics).
How does the power-good (PG) function operate on the TC1303B-IA0EUN?
The TC1303B-IA0EUN's PG pin is a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal 3.3 V value and holds for a guaranteed 300 ms delay-making it ideal for driving processor RESET inputs. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored, open-drain) and TC1303C/TC1304 (dual-monitored).
Can the TC1303B-IA0EUN be used with a single input supply?
Yes-the TC1303B-IA0EUN is designed for single-supply operation: VIN1 and VIN2 are both rated for 2.7–5.5 V and must be connected to the same input source (e.g., a Li-ion battery or USB 5 V rail). The datasheet mandates short, low-impedance board traces between VIN1 and VIN2 to minimize noise coupling and ensure stable regulation on both outputs.
What is the minimum output capacitance required for stable operation of the TC1303B-IA0EUN?
The TC1303B-IA0EUN requires ≥1 µF ceramic capacitance on VOUT2 (LDO output) and ≥4.7 µF ceramic capacitance on VOUT1 (buck output), as specified in the Typical Application Circuits (DS21949C, page 5). These values are mandatory for loop stability and transient response; using smaller or non-ceramic capacitors may cause oscillation or poor load regulation.
Does the TC1303B-IA0EUN support automatic power-mode transitions?
Yes-the buck regulator in TC1303B-IA0EUN automatically transitions between PWM (at heavy loads) and PFM (at light loads) to maintain high efficiency across the full 0–500 mA output range. This transition is seamless and requires no external control or configuration; it is inherent to the IC's internal control architecture, as documented in the Functional Block Diagram (DS21949C, page 3) and Efficiency Curves (pages 11–12).
TC1303B-IA0EUN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
TC1303B-IA0EUN FAQ
1.How can I place an order for TC1303B-IA0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-IA0EUN 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-IA0EUN reliable?
The price and inventory of TC1303B-IA0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-IA0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-IA0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-IA0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-IA0EUN?
TC1303B-IA0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-IA0EUN 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-IA0EUN?
For technical support, including TC1303B-IA0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-IA0EUN requirements.
6.How does Aetrix verify that TC1303B-IA0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-IA0EUN 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-IA0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-IA0EUN?
All TC1303B-IA0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-IA0EUN, 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-IA0EUN part is unused and in its original packaging.
Return procedure for TC1303B-IA0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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