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Microchip Technology TC1303B-RD1EMFTR
- Part No.:
- TC1303B-RD1EMFTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-RD1EMFTR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
TC1303B-RD1EMFTR 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 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. It is used in portable medical instruments requiring sequenced, low-noise dual-rail supplies.
For engineers reviewing the TC1303B-RD1EMFTR datasheet, TC1303B-RD1EMFTR pinout, TC1303B-RD1EMFTR application, or TC1303B-RD1EMFTR equivalent, key selection criteria include LDO-monitored PG behavior, independent SHDN1/SHDN2 control, 2.0 MHz fixed-frequency PWM operation, 137 mV typical dropout at 200 mA for VOUT2, and DFN-10 (3×3 mm) package compatibility with thermal pad grounding.
Technical Context
The TC1303B-RD1EMFTR implements a synchronous buck converter with PFM/PWM auto-transition and an internally compensated LDO - both outputs are independently shutdown via SHDN1 (buck) and SHDN2 (LDO). Its PG pin is push-pull and asserts when VOUT2 reaches ≥94% of nominal, with 300 ms delay for processor reset timing.
It uses a fixed 2.0 MHz oscillator for heavy-load PWM operation, achieving >90% efficiency at 500 mA, while automatically switching to low-quiescent PFM mode under light load. The LDO requires only a single 1 µF ceramic output capacitor and maintains ±0.3% output voltage tolerance over temperature and line/load variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V) and USB 5 V supply rails without external pre-regulation |
| Buck Output (VOUT1) | 1.8 V @ 500 mA - fixed-output variant optimized for processor core voltage with 0.2% load regulation |
| LDO Output (VOUT2) | 3.3 V @ 300 mA - fixed bias rail with 137 mV typical dropout at 200 mA, enabling operation down to VIN = 3.437 V |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable medical sensors with dual-rail wake-up capability |
| Power-Good Logic | Push-pull PG monitoring VOUT2 only - eliminates need for external reset supervisor when LDO supplies MCU I/O or peripherals |
| Switching Frequency | 2.0 MHz ±0.4 MHz - allows use of compact 4.7 µH inductor and 4.7 µF ceramic capacitors, reducing board area by >40% vs. 500 kHz solutions |
| Operating Temperature | −40°C to +125°C junction - qualified for industrial-grade handheld diagnostics and automotive accessory applications |
Pinout & Package
TC1303B-RD1EMFTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed thermal pad (EP), requiring connection to AGND for optimal thermal performance (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN2 | LDO shutdown control | Active-high logic input (>45% VIN); enables independent LDO disable for power sequencing or standby mode |
| 2 - VIN2 | LDO input supply | Accepts same input as VIN1; must be routed with minimal trace length to reduce noise coupling into LDO path |
| 3 - VOUT2 | LDO regulated output | 3.3 V fixed output; requires ≥1 µF ceramic capacitor to AGND for stability and transient response |
| 4 - PG | Power-good indicator | Push-pull output asserting high when VOUT2 ≥94% of 3.3 V; provides 300 ms delay for reliable processor reset |
| 5 - AGND | Analog ground reference | Must be connected to clean analog ground plane; separate from PGND to minimize switching noise injection |
| 6 - PGND | Power ground return | High-current return path for buck switch node (LX); ties to AGND only at single point near EP |
| 7 - LX | Buck switch node | Connects to external inductor; carries high di/dt; requires tight layout and Kelvin connection to minimize EMI |
| 8 - VIN1 | Buck input supply | Main input for synchronous buck stage; shares source with VIN2 but routed separately for optimal decoupling |
| 9 - SHDN1 | Buck shutdown control | Active-high logic input (>45% VIN); allows independent buck disable during sleep without affecting LDO rail |
| 10 - VFB1/VOUT1 | Buck feedback/output | Fixed 1.8 V output pin; no external divider needed - simplifies layout and improves accuracy vs. adjustable variants |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown control | SHDN1 and SHDN2 allow granular power sequencing - e.g., keep LDO active for RTC while shutting down buck during deep sleep |
| Internally compensated regulators | Eliminates need for external compensation networks on either output, reducing BOM count and layout sensitivity |
| Automatic PWM-to-PFM transition | Maintains >85% efficiency down to 1 mA load without manual mode control or additional circuitry |
| Low-noise LDO with 62 dB PSRR | Rejects >99.8% of low-frequency ripple from shared input rail, critical for ADC reference or RF bias supplies |
| Overtemperature and short-circuit protection | Thermal shutdown at 165°C with 10°C hysteresis and cycle-by-cycle current limiting prevent damage during fault conditions |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Handheld blood glucose meter with real-time display and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Provides 1.8 V core voltage for ARM Cortex-M0+ MCU and 3.3 V I/O rail for display driver and BLE transceiver. Use Value: Independent SHDN2 enables keeping 3.3 V rail active for BLE advertising while MCU sleeps on 1.8 V, extending battery life beyond 2 weeks on CR2032. | Use Scenario: Field-deployable oscilloscope probe with integrated signal conditioning and USB-C power delivery. IC Role / Device Role / Timing Role: Generates stable 1.8 V analog front-end supply and 3.3 V digital interface rail from 5 V USB bus. Use Value: 2.0 MHz switching frequency avoids interference with 1–10 MHz measurement bandwidth; PG output synchronizes firmware initialization with rail stabilization. |
| Industrial Handheld Terminals | Wearable Diagnostic Patch |
Use Scenario: Ruggedized barcode scanner operating in −20°C to +70°C ambient with cold-chain logistics logging. IC Role / Device Role / Timing Role: Delivers 1.8 V to imaging sensor ASIC and 3.3 V to secure element and NFC controller. Use Value: −40°C to +125°C junction rating ensures reliable startup at sub-zero temperatures; PG delay prevents false resets during cold-start voltage sag. | Use Scenario: Disposable ECG patch with 30-day battery life, transmitting data via BLE to smartphone. IC Role / Device Role / Timing Role: Supplies 1.8 V to ultra-low-power microcontroller and 3.3 V to analog signal chain and BLE radio. Use Value: 65 µA total IQ enables >30 days runtime on 120 mAh coin cell; LDO-monitored PG guarantees BLE radio only activates after full 3.3 V rail stabilization. |
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-RD1EMFTR | Monitors both VOUT1 and VOUT2 for PG assertion; identical pinout and electrical specs otherwise | Required where system reset must wait for stabilization of *both* rails - e.g., FPGA with core and I/O banks on separate supplies | Select TC1303C-RD1EMFTR only if dual-rail PG monitoring is mandatory; otherwise TC1303B-RD1EMFTR reduces reset latency by ~165 µs |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO); higher IQ (120 µA); QFN-24 package; no LDO-monitored PG option | Suitable for systems needing >2 rails or higher current (up to 1 A buck), but lacks dedicated LDO-only PG functionality | Choose TPS65023RGZR for multi-rail complexity; avoid if LDO-specific reset timing or ultra-low IQ (<70 µA) is required |
Compared with TC1303C-RD1EMFTR and TPS65023RGZR, TC1303B-RD1EMFTR uniquely balances minimal IQ, LDO-targeted reset timing, and compact DFN-10 footprint - making it optimal for space-constrained, battery-sensitive dual-rail applications where only the LDO rail powers critical peripherals.
Availability
TC1303B-RD1EMFTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for TC1303B-RD1EMFTR 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, with a focus on embedded control and energy-efficient solutions.
The TC1303 family was designed specifically for battery-powered portable electronics needing highly integrated, low-quiescent dual-rail power conversion - emphasizing small footprint, independent regulation, and intelligent power-good signaling.
FAQ
What output voltages does the TC1303B-RD1EMFTR provide?
The TC1303B-RD1EMFTR provides a fixed 1.8 V output (VOUT1) capable of delivering up to 500 mA, and a fixed 3.3 V output (VOUT2) capable of delivering up to 300 mA. These values are factory-trimmed and do not require external feedback resistors. The TC1303B-RD1EMFTR datasheet specifies ±0.3% output voltage tolerance across temperature and load conditions.
How does the power-good (PG) function operate in TC1303B-RD1EMFTR?
In the TC1303B-RD1EMFTR, the PG pin is a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value (3.3 V), with a built-in 300 ms delay to ensure stable rail establishment before releasing processor reset. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored) and TC1303C (dual-monitored).
Can TC1303B-RD1EMFTR operate from a single-cell Li-ion battery?
Yes, TC1303B-RD1EMFTR supports input voltages from 2.7 V to 5.5 V, fully covering the discharge range of a single-cell Li-ion battery (typically 4.2 V down to 2.7 V). At 200 mA load, the LDO's 137 mV dropout ensures 3.3 V output remains regulated until VIN drops below 3.437 V - well within usable battery range.
What is the thermal performance of TC1303B-RD1EMFTR in its DFN package?
The TC1303B-RD1EMFTR in the 10-pin 3×3 mm DFN package 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 under the exposed pad. This enables continuous 500 mA buck operation at ambient temperatures up to +85°C without derating, provided the EP is soldered to AGND.
Does TC1303B-RD1EMFTR require external compensation components?
No, TC1303B-RD1EMFTR integrates internal compensation for both the buck regulator and LDO, eliminating the need for external RC networks or type-II/III compensators. This simplifies design, reduces bill-of-materials cost, and improves production yield - confirmed in the DS21949C datasheet section "Both Outputs Internally Compensated".
TC1303B-RD1EMFTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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:
- 1.6V, 500mA
- Voltage/Current - Output 2:
- 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-RD1EMFTR FAQ
1.How can I place an order for TC1303B-RD1EMFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-RD1EMFTR 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-RD1EMFTR reliable?
The price and inventory of TC1303B-RD1EMFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-RD1EMFTR is usually 5 days.
3.What payment methods are accepted for TC1303B-RD1EMFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-RD1EMFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-RD1EMFTR?
TC1303B-RD1EMFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-RD1EMFTR 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-RD1EMFTR?
For technical support, including TC1303B-RD1EMFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-RD1EMFTR requirements.
6.How does Aetrix verify that TC1303B-RD1EMFTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-RD1EMFTR 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-RD1EMFTR meets industry standards.
7.What is the process for return or replacement of TC1303B-RD1EMFTR?
All TC1303B-RD1EMFTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-RD1EMFTR, 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-RD1EMFTR part is unused and in its original packaging.
Return procedure for TC1303B-RD1EMFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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