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Microchip Technology TC1303B-AD0EMFTR
- Part No.:
- TC1303B-AD0EMFTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-AD0EMFTR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,147
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Product details
Overview
TC1303B-AD0EMFTR 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 3.3V on VOUT1 and 2.5V on VOUT2, operates from 2.7–5.5V input, achieves >90% peak efficiency at 2.0 MHz switching frequency, and supports -40°C to +125°C junction temperature - used in portable medical instruments requiring stable dual-rail biasing.
For engineers reviewing the TC1303B-AD0EMFTR datasheet, TC1303B-AD0EMFTR pinout, TC1303B-AD0EMFTR application, or TC1303B-AD0EMFTR equivalent, key selection criteria include LDO-monitored PG logic, independent shutdown control per rail, ultra-low 65 µA quiescent current, 137 mV dropout at 200 mA, and DFN-10 package compatibility with space-constrained USB-powered devices.
Technical Context
The TC1303B-AD0EMFTR implements a fixed-frequency PWM buck stage with automatic transition to PFM mode under light load to maintain low IQ, while its LDO uses internal compensation and requires only a single 1 µF ceramic output capacitor. The power-good signal is a push-pull output referenced exclusively to VOUT2 regulation with 94% threshold and 300 ms delay.
Its dual independent shutdown inputs (SHDN1 for buck, SHDN2 for LDO) enable precise sequencing control, and UVLO (2.55V typ), overtemperature (165°C), and short-circuit protection are integrated without external components. The device uses separate ground pins (AGND and PGND) to isolate analog and power return paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 3.3V fixed, 500 mA max - powers processor core or FPGA I/O banks with low-noise 2.0 MHz switching |
| Output 2 (LDO) | 2.5V fixed, 300 mA max - supplies analog sensors or RF front-end with 137 mV dropout at 200 mA |
| Quiescent Current | 65 µA typical - enables multi-week battery life in always-on handheld medical devices |
| Power-Good Logic | Push-pull output monitoring VOUT2 only - eliminates need for external reset supervisor in LDO-dependent systems |
| Switching Frequency | 2.0 MHz ±0.4 MHz - allows use of compact 4.7 µH inductor and 4.7 µF output capacitors |
| Operating Temp | -40°C to +125°C junction - qualified for industrial and automotive cabin-adjacent portable equipment |
| Package | 3×3 mm, 10-pin DFN - thermally enhanced with exposed pad tied to AGND for <41°C/W θJA |
Pinout & Package
TC1303B-AD0EMFTR is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP) connected to AGND. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation starting from top-left corner when pin 1 marker is oriented top-left.
| 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 2.7–5.5V; must be routed adjacent to VIN1 with minimal trace length to reduce noise coupling |
| 3 (VOUT2) | LDO regulated output | Delivers 2.5V ±0.3% at up to 300 mA; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good indicator | Push-pull output asserting high when VOUT2 ≥ 94% of 2.5V; 300 ms delay prevents false resets during startup |
| 5 (AGND) | Analog reference ground | Must connect to quiet analog ground plane; isolated from PGND except at single-point star connection |
| 6 (PGND) | Power ground return | Return path for buck switch node (LX); connects to high-current ground plane under inductor and input cap |
| 7 (LX) | Buck switch node | Connects to inductor and catch diode (internal); requires tight layout with minimal loop area to reduce EMI |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5V; shares input source with VIN2 but requires local 4.7 µF ceramic decoupling |
| 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 3.3V output; no external divider needed - pin connects directly to output capacitor and load |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown | SHDN1 and SHDN2 allow staggered power-up/down of buck and LDO rails without external timing circuitry |
| LDO-monitored power-good | PG asserts only when VOUT2 reaches 94% of 2.5V - ensures clean reset for LDO-fed peripherals |
| Internally compensated LDO | Eliminates need for external compensation network; stable with only 1 µF ceramic output capacitor |
| PFM/PWM auto-transition | Seamlessly shifts from 2.0 MHz PWM to burst-mode PFM below ~10 mA load - maintains <100 µA system IQ |
| Thermal & fault protection | Integrated overtemperature shutdown (165°C), UVLO (2.55V), and output short-circuit limiting protect against board-level faults |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Battery-operated glucose meter with analog front-end and digital display. IC Role / Device Role / Timing Role: Dual-rail power source delivering 3.3V to microcontroller and 2.5V to precision ADC/reference. Use Value: 137 mV LDO dropout extends usable battery range; PG signal synchronizes ADC conversion start after LDO stabilization. | Use Scenario: Handheld oscilloscope module powered solely via USB 5V bus. IC Role / Device Role / Timing Role: Primary voltage translator generating clean 3.3V logic rail and low-noise 2.5V analog reference from USB input. Use Value: 2.0 MHz switching enables small magnetics; 65 µA IQ minimizes standby drain during host-suspended mode. |
| Industrial Handheld Terminals | Wearable Diagnostic Devices |
Use Scenario: Ruggedized barcode scanner operating across -20°C to +70°C ambient. IC Role / Device Role / Timing Role: Dual-output PMIC supplying 3.3V to CMOS image sensor interface and 2.5V to laser driver bias circuit. Use Value: -40°C to +125°C rating ensures reliability in uncontrolled environments; independent SHDN pins enable sensor sleep/wake coordination. | Use Scenario: Patch-style ECG monitor worn continuously for 72-hour ambulatory recording. IC Role / Device Role / Timing Role: Ultra-low-power regulator providing 3.3V to BLE radio and 2.5V to instrumentation amplifier chain. Use Value: 65 µA total IQ extends coin-cell life; push-pull PG eliminates external pull-up resistor, reducing BOM count and leakage paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303C-AD0EMFTR | Monitors both VOUT1 and VOUT2 for PG assertion; open-drain PG output | Suitable where system reset must wait for stabilization of both rails | Select when coordinated reset of digital and analog subsystems is required |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO); 2.25 MHz switching; higher IQ (80 µA); QFN-24 package | Supports more complex SoC power trees with additional voltage domains | Choose when 3.3V/2.5V/1.8V triple-rail generation is needed alongside tighter load transient response |
Compared with TC1303C-AD0EMFTR, the TC1303B-AD0EMFTR offers simpler LDO-only reset signaling and push-pull PG drive, while TPS65023RGZR adds a third output and higher integration at the cost of larger footprint and higher quiescent current - making TC1303B optimal for cost- and size-sensitive dual-rail designs.
Availability
TC1303B-AD0EMFTR 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 manufacturability.
Supply support for TC1303B-AD0EMFTR 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 portable electronics needing highly integrated, low-quiescent dual-rail power solutions - emphasizing minimal external component count, thermal efficiency, and robust fault protection.
FAQ
What output voltages does the TC1303B-AD0EMFTR provide?
The TC1303B-AD0EMFTR provides fixed 3.3V on its buck output (VOUT1) and fixed 2.5V on its LDO output (VOUT2). These values are factory-trimmed and do not require external feedback resistors. The 3.3V rail supports digital logic and microcontrollers, while the 2.5V rail supplies analog circuitry such as ADCs and sensors - both outputs are specified over -40°C to +125°C junction temperature.
How does the power-good (PG) function operate in TC1303B-AD0EMFTR?
The TC1303B-AD0EMFTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal 2.5V value and holds active for a guaranteed 300 ms delay. This behavior differs from TC1303A/C variants, which monitor the buck output or both rails and use open-drain PG - making TC1303B-AD0EMFTR ideal for systems where LDO stability dictates system readiness.
Can TC1303B-AD0EMFTR operate from a single 3.7V Li-ion battery?
Yes, TC1303B-AD0EMFTR supports input voltages from 2.7V to 5.5V, fully covering the discharge curve of a single-cell Li-ion battery (3.0V–4.2V). Its 137 mV LDO dropout at 200 mA ensures 2.5V regulation remains valid down to 2.637V input, and the buck regulator maintains 3.3V output even at 3.0V input with appropriate inductor sizing - confirmed in DS21949C Figure 2-11 and Figure 2-13.
What is the thermal performance of TC1303B-AD0EMFTR in its DFN package?
In the 3×3 mm DFN package with exposed thermal pad connected to AGND, TC1303B-AD0EMFTR 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. This allows continuous 500 mA buck and 300 mA LDO operation at ambient temperatures up to +85°C without derating - validated in DS21949C page 10 and Figure 2-19.
Does TC1303B-AD0EMFTR require external compensation components?
No, TC1303B-AD0EMFTR integrates full internal compensation for both the buck regulator and LDO stages. The buck stage uses a fixed 2.0 MHz oscillator and proprietary control loop requiring no external RC network, while the LDO is stable with only a 1 µF ceramic output capacitor on VOUT2 - eliminating design complexity and board area typically needed for external compensation.
TC1303B-AD0EMFTR 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:
- 3.3V, 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-AD0EMFTR FAQ
1.How can I place an order for TC1303B-AD0EMFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-AD0EMFTR 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-AD0EMFTR reliable?
The price and inventory of TC1303B-AD0EMFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-AD0EMFTR is usually 5 days.
3.What payment methods are accepted for TC1303B-AD0EMFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-AD0EMFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-AD0EMFTR?
TC1303B-AD0EMFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-AD0EMFTR 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-AD0EMFTR?
For technical support, including TC1303B-AD0EMFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-AD0EMFTR requirements.
6.How does Aetrix verify that TC1303B-AD0EMFTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-AD0EMFTR 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-AD0EMFTR meets industry standards.
7.What is the process for return or replacement of TC1303B-AD0EMFTR?
All TC1303B-AD0EMFTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-AD0EMFTR, 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-AD0EMFTR part is unused and in its original packaging.
Return procedure for TC1303B-AD0EMFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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