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Microchip Technology TC1303A-PP3EUNTR
- Part No.:
- TC1303A-PP3EUNTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303A-PP3EUNTR.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,175
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Product details
Overview
TC1303A-PP3EUNTR 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 of the buck output only. It delivers 1.8V/500 mA and 3.3V/300 mA outputs, operates from 2.7–5.5V input, and features 65 µA typical quiescent current and 2.0 MHz fixed-frequency PWM switching. It targets portable battery-powered systems requiring tight voltage regulation and processor reset signaling.
For engineers reviewing the TC1303A-PP3EUNTR datasheet, TC1303A-PP3EUNTR pinout, TC1303A-PP3EUNTR application, or TC1303A-PP3EUNTR equivalent, key selection criteria include buck/LDO output voltage pairing, PG monitoring scope (buck-only), shutdown independence, thermal performance in DFN-10 package, and compatibility with 4.7 µH inductors and 1–4.7 µF ceramic capacitors.
Technical Context
The TC1303A-PP3EUNTR implements a synchronous buck converter with integrated P-channel and N-channel MOSFETs (RDS(on) = 450 mΩ each), fixed 2.0 MHz PWM operation under heavy load, and automatic transition to PFM mode at light loads to maintain ultra-low IQ. Its LDO uses internal compensation and achieves 137 mV dropout at 200 mA.
Power-good logic monitors only the buck output (VOUT1) with 94% threshold high, 89% threshold low, 300 ms active timeout, and open-drain output. Independent SHDN1/SHDN2 control enables staggered enable/disable of buck and LDO stages without sequencing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output | 1.8V fixed, 500 mA max - supplies core voltage for low-power processors or FPGAs |
| LDO Output | 3.3V fixed, 300 mA max - powers I/O, USB PHY, or sensors requiring low-noise bias |
| PG Monitoring | Buck output only (TC1303A variant) - asserts reset signal when VOUT1 drops below 94% of 1.8V |
| Quiescent Current | 65 µA typical - enables >100-hour standby in coin-cell–powered devices |
| Switching Frequency | 2.0 MHz ±20% - allows use of compact 4.7 µH inductors and reduces EMI filtering burden |
| Operating Temp | -40°C to +125°C junction - supports automotive cabin and industrial edge deployments |
| Package | 10-pin 3×3 mm DFN with exposed pad - provides 41°C/W θJA on 4-layer board for thermal reliability |
Pinout & Package
TC1303A-PP3EUNTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. Pin 1 is SHDN2; pin 10 is PG. The exposed pad must be soldered to AGND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN2 | LDO shutdown control | Active-high logic input (>45% VIN); enables independent LDO disable without affecting buck stage |
| 2: VIN2 | LDO input supply | Accepts 2.7–5.5V; must be short-traced to VIN1 to minimize noise coupling into LDO path |
| 3: VOUT2 | LDO regulated output | Delivers 3.3V ±2.5%; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4: PG | Power-good indicator | Open-drain output asserting low when VOUT1 is within 94–96% of 1.8V; 300 ms delay prevents false resets |
| 5: AGND | Analog ground reference | Separate ground node for feedback and regulation circuitry; must tie to low-impedance analog ground plane |
| 6: PGND | Power ground return | High-current return path for buck switch; isolated from AGND except at single-point star ground |
| 7: LX | Buck switch node | Connects to external 4.7 µH inductor; carries high di/dt; requires tight layout and Kelvin connection |
| 8: VIN1 | Buck input supply | Primary input for buck stage; shares same source as VIN2 but routed separately for optimal decoupling |
| 9: SHDN1 | Buck shutdown control | Active-high logic input (>45% VIN); enables independent buck disable while LDO remains active |
| 10: VFB1/VOUT1 | Buck feedback/sense | Fixed 1.8V output - internally connected; no external divider required |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck/LDO shutdown | Enables flexible power sequencing in multi-rail systems without external logic or timers |
| Internally compensated LDO | Eliminates need for external compensation network - reduces BOM count and layout area |
| 2.0 MHz PWM + PFM auto-transition | Maintains >85% efficiency from 1 mA to 500 mA load - extends battery life across operating modes |
| Open-drain PG with 300 ms delay | Provides clean, debounced reset signal compatible with ARM Cortex-M and RISC-V microcontrollers |
| Low 137 mV LDO dropout @200 mA | Supports operation down to 3.437V input for 3.3V rail - maximizes usable battery voltage range |
| Thermal/UVLO/overcurrent protection | Guarantees safe operation under fault conditions without external supervision circuitry |
Applications
| Cellular Phone Power Management | USB-Powered Portable Instrument |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.8V core) and RF transceiver (3.3V I/O). IC Role / Device Role / Timing Role: Primary PMIC delivering tightly regulated, sequenced voltages with PG-driven processor reset. Use Value: Reduces component count by replacing discrete buck + LDO + supervisor ICs; 65 µA IQ extends talk time. | Use Scenario: Compact medical sensor module powered via USB 5V bus. IC Role / Device Role / Timing Role: Converts 5V USB input to 1.8V digital core and 3.3V analog front-end, with PG confirming stable startup before data acquisition. Use Value: 3×3 mm DFN footprint saves PCB space; 2.0 MHz switching avoids audible noise in sensitive measurement environments. |
| Handheld Medical Instrument | Organizer/PDA System Power |
Use Scenario: Battery-powered glucose meter requiring accurate ADC reference and low-noise display driver supply. IC Role / Device Role / Timing Role: Supplies 1.8V to microcontroller and 3.3V to precision ADC and LCD controller, with PG ensuring valid readings before sampling. Use Value: LDO's 62 dB PSRR at 100 Hz suppresses USB or battery ripple; 1 µF output cap minimizes board area. | Use Scenario: Legacy PDA with ARM9 CPU and NAND flash requiring separate core and I/O rails. IC Role / Device Role / Timing Role: Generates 1.8V core and 3.3V I/O from single Li-ion cell (2.7–4.2V), with independent shutdown for power gating. Use Value: Buck efficiency >90% at 250 mA load preserves battery capacity; -40°C to +125°C rating ensures outdoor reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303B-PP3EUNTR | PG monitors LDO output (VOUT2) instead of buck output; same pinout and electrical specs | Suitable when system reset must be triggered by LDO rail stability (e.g., analog subsystem readiness) | Select TC1303B-PP3EUNTR if power-good assertion must track 3.3V rail rather than 1.8V rail |
| TPS62231DRYR | Single-output 600 mA buck only; no integrated LDO or PG; 3 MHz switching; smaller 2×2 mm WSON | Requires external LDO and supervisor for dual-rail + reset functionality | Choose TPS62231DRYR only when LDO and PG functions are implemented elsewhere in design |
Compared with TC1303B-PP3EUNTR, TC1303A-PP3EUNTR provides buck-rail–centric reset timing critical for processor initialization; versus TPS62231DRYR, it eliminates three external components (LDO, supervisor, pull-up) at the cost of larger package and fixed dual-output topology.
Availability
TC1303A-PP3EUNTR is available at Aetrix Electronics and suitable for cellular phones, USB-powered devices, and handheld medical instruments requiring stable component supply across production lifecycles.
Supply support for TC1303A-PP3EUNTR 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.
The TC1303 family was designed to deliver highly integrated, low-quiescent-current dual-rail power solutions for space-constrained portable electronics where battery life and board area are critical.
FAQ
What output voltages does the TC1303A-PP3EUNTR provide?
The TC1303A-PP3EUNTR provides two fixed output voltages: 1.8V at up to 500 mA from its synchronous buck regulator (VOUT1), and 3.3V at up to 300 mA from its low-dropout linear regulator (VOUT2). These values are factory-set and require no external feedback resistors - the VFB1 pin is internally connected to the 1.8V output node.
How does the power-good (PG) function operate on the TC1303A-PP3EUNTR?
The TC1303A-PP3EUNTR's PG pin is an open-drain output that monitors only the buck regulator output (VOUT1). It asserts low when VOUT1 falls below 89% of 1.8V and releases high when VOUT1 rises above 94% of 1.8V, with built-in 300 ms active timeout to prevent chatter during brownout conditions. This behavior is specific to the TC1303A variant.
Can the TC1303A-PP3EUNTR be used with a single input source for both VIN1 and VIN2?
Yes - the TC1303A-PP3EUNTR is designed for shared input operation: VIN1 and VIN2 should be connected together with short, low-inductance traces. Both inputs accept 2.7V to 5.5V, and the datasheet specifies that they are intended to be supplied from the same source, such as a Li-ion battery or USB 5V rail.
What is the thermal performance of the TC1303A-PP3EUNTR in its DFN package?
The TC1303A-PP3EUNTR in the 10-pin 3×3 mm DFN package has 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 under the exposed pad. This enables reliable operation at full 500 mA buck load up to +85°C ambient, with thermal shutdown activating at +165°C junction temperature.
Does the TC1303A-PP3EUNTR support independent enable/disable of its two regulators?
Yes - the TC1303A-PP3EUNTR provides fully independent shutdown control: SHDN1 enables/disables the buck regulator, while SHDN2 controls the LDO. Both are active-high logic inputs with thresholds defined as percentages of VIN (VIH >45%, VIL <15%), allowing flexible sequencing without external timing components.
TC1303A-PP3EUNTR 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:
- 1.8V, 500mA
- Voltage/Current - Output 2:
- 1.8V, 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
TC1303A-PP3EUNTR FAQ
1.How can I place an order for TC1303A-PP3EUNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-PP3EUNTR 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 TC1303A-PP3EUNTR reliable?
The price and inventory of TC1303A-PP3EUNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-PP3EUNTR is usually 5 days.
3.What payment methods are accepted for TC1303A-PP3EUNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-PP3EUNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-PP3EUNTR?
TC1303A-PP3EUNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-PP3EUNTR 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 TC1303A-PP3EUNTR?
For technical support, including TC1303A-PP3EUNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-PP3EUNTR requirements.
6.How does Aetrix verify that TC1303A-PP3EUNTR is sourced from the original manufacturer or authorized distributors?
All TC1303A-PP3EUNTR 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 TC1303A-PP3EUNTR meets industry standards.
7.What is the process for return or replacement of TC1303A-PP3EUNTR?
All TC1303A-PP3EUNTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-PP3EUNTR, 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 TC1303A-PP3EUNTR part is unused and in its original packaging.
Return procedure for TC1303A-PP3EUNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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