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Microchip Technology TC1303B-ZH0EMFTR
- Part No.:
- TC1303B-ZH0EMFTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-ZH0EMFTR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,353
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Product details
Overview
TC1303B-ZH0EMFTR 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 1.8 V @ 500 mA and 2.5 V @ 300 mA from a 2.7–5.5 V input, features 65 µA typical quiescent current, 2.0 MHz fixed-frequency PWM operation, and operates across –40°C to +125°C junction temperature. It is used in portable medical instruments requiring tightly regulated dual-rail supplies with processor reset signaling.
For engineers reviewing the TC1303B-ZH0EMFTR datasheet, TC1303B-ZH0EMFTR pinout, TC1303B-ZH0EMFTR application, or TC1303B-ZH0EMFTR equivalent, key selection criteria include LDO-monitored PG functionality, independent shutdown control per rail, 137 mV dropout at 200 mA, internal compensation, and DFN-10 package compatibility with space-constrained USB-powered devices.
Technical Context
The TC1303B-ZH0EMFTR implements a synchronous buck stage with PFM/PWM auto-transition for light-load efficiency, paired with a standalone LDO stage featuring push-pull power-good output referenced solely to VOUT2. Its control architecture isolates buck and LDO enable logic via SHDN1 and SHDN2 pins, enabling independent sequencing and fault containment.
Unlike TC1303A (buck-monitored PG) or TC1303C/TC1304 (dual-monitored or sequenced), the TC1303B variant uses a dedicated PG threshold of 94% of VOUT2 with 2% hysteresis and 300 ms active timeout, making it suitable for systems where auxiliary rail stability must trigger host reset before core rail initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 Type | Synchronous buck regulator, adjustable (0.8–4.5 V) or fixed (e.g., 1.8 V), 500 mA max |
| Output 2 Type | Low-dropout linear regulator, fixed (e.g., 2.5 V), 300 mA max, 137 mV dropout @ 200 mA |
| Power-Good Logic | Push-pull output monitoring only VOUT2; asserts high when VOUT2 ≥ 94% of nominal |
| Quiescent Current | 65 µA typical total device IQ; enables battery life extension in always-on portable systems |
| Switching Frequency | 2.0 MHz fixed PWM under heavy load; enables use of small 4.7 µH inductor and 4.7 µF output capacitor |
| Operating Temp | –40°C to +125°C junction range; supports industrial and automotive-adjacent embedded applications |
| Protection | Undervoltage lockout (2.55 V typ), overtemperature shutdown (165°C), short-circuit and thermal foldback |
Pinout & Package
TC1303B-ZH0EMFTR 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN2 | LDO shutdown control input | Active-high logic (>45% VIN); enables/disables VOUT2 independently of buck stage |
| 2 - VIN2 | LDO input supply | Accepts 2.7–5.5 V; must be routed with minimal trace length to VIN1 for noise coupling control |
| 3 - VOUT2 | LDO regulated output | Delivers fixed 2.5 V @ up to 300 mA; requires ≥1 µF ceramic capacitor to AGND |
| 4 - PG | Power-good status output | Push-pull, actively driven high when VOUT2 is within regulation; drives processor RESET directly |
| 5 - AGND | Analog ground reference | Must connect to clean analog ground plane; separate from PGND except at single-point star node |
| 6 - PGND | Power ground return | High-current return path for buck switch node; ties to AGND only at EP pad |
| 7 - LX | Buck switch node | Connects to external 4.7 µH inductor; carries high di/dt switching current; requires tight layout |
| 8 - VIN1 | Buck input supply | Accepts 2.7–5.5 V; shared with VIN2 in most designs; requires local 4.7 µF decoupling |
| 9 - SHDN1 | Buck shutdown control input | Active-high logic (>45% VIN); enables/disables VOUT1 independently of LDO stage |
| 10 - VFB1/VOUT1 | Buck feedback or output | Configured as VOUT1 for fixed-output variants (e.g., 1.8 V); no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-rail shutdown | SHDN1 and SHDN2 allow staged power-up/down-e.g., disable LDO first during system sleep to avoid backfeed |
| PG tied exclusively to LDO | Ensures system reset is asserted only after stable auxiliary rail (e.g., I/O, memory, sensors) is ready-critical for data integrity |
| Internally compensated buck | Eliminates need for external compensation network; reduces BOM count and layout sensitivity in cost-sensitive designs |
| 2.0 MHz fixed-frequency PWM | Enables compact filter design: 4.7 µH inductor + 4.7 µF output cap fits sub-10 mm² footprint |
| Low-noise LDO output | 1.8 µV/√Hz output noise @ 1 kHz and 62 dB PSRR @ ≤100 Hz support noise-sensitive analog circuitry (e.g., ADC references) |
| Thermal protection with hysteresis | 165°C shutdown with 10°C hysteresis prevents thermal cycling; θJA = 41°C/W (DFN) supports 1 W dissipation on 4-layer board |
Applications
| USB-Powered Portable Instrument | Handheld Medical Sensor Hub |
|---|---|
Use Scenario: Battery-powered glucose meter with LCD display, Bluetooth LE radio, and precision analog front-end. IC Role / Device Role / Timing Role: Dual-rail power source: 1.8 V for MCU core and 2.5 V for op-amp sensor interface and ADC reference. Use Value: LDO-monitored PG ensures Bluetooth radio and sensor analog chain are fully stabilized before MCU firmware executes calibration routines. | Use Scenario: Portable ECG recorder with real-time signal processing and SD card logging. IC Role / Device Role / Timing Role: Primary power IC delivering 1.8 V to ARM Cortex-M4 and 2.5 V to instrumentation amplifier and 16-bit SAR ADC. Use Value: Independent SHDN2 control allows analog signal path to remain powered while MCU enters deep sleep-reducing system IQ by >40 µA. |
| Industrial Handheld Terminal | Low-Power IoT Edge Node |
Use Scenario: Ruggedized barcode scanner with integrated Wi-Fi module and capacitive touchscreen controller. IC Role / Device Role / Timing Role: Supplies 1.8 V to application processor and 2.5 V to touchscreen driver IC and RF transceiver bias rails. Use Value: Push-pull PG output directly resets the Wi-Fi SoC without external level-shifting or pull-up resistors-reducing component count and startup latency. | Use Scenario: Battery-operated environmental monitor with LoRaWAN radio, temperature/humidity sensor, and microSD storage. IC Role / Device Role / Timing Role: Provides 1.8 V to ultra-low-power MCU and 2.5 V to precision humidity sensor and SD card interface. Use Value: 65 µA total IQ and automatic PFM mode at light loads extend coin-cell battery life beyond 2 years in periodic wake-up operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16311-H/ML | Single 600 mA buck + 300 mA LDO; PG monitors buck only; no independent LDO shutdown | Requires external logic to coordinate LDO enable with buck output; unsuitable where LDO rail must initialize first | Select when system reset timing is tied to core voltage-not auxiliary rail-and layout space permits larger MSOP-10 |
| TPS65023RSBR | Triple-output (2 buck + 1 LDO); 2.25 MHz switching; PG configurable per rail; higher IQ (120 µA) | Supports complex sequencing but over-spec'd for dual-rail needs; adds cost and layout complexity | Choose only if third rail (e.g., DDR I/O) is required; otherwise increases BOM and thermal overhead unnecessarily |
Compared with MCP16311-H/ML and TPS65023RSBR, TC1303B-ZH0EMFTR uniquely provides LDO-centric power-good assertion and true independent shutdown-enabling simpler, lower-IQ designs where auxiliary rail readiness dictates system boot sequence.
Availability
TC1303B-ZH0EMFTR is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial handheld terminals requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TC1303B-ZH0EMFTR 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The TC1303 family was designed specifically for space-constrained portable electronics needing efficient dual-rail power with intelligent reset signaling-emphasizing low IQ, small footprint, and rail-specific monitoring.
FAQ
What output voltages does the TC1303B-ZH0EMFTR deliver?
The TC1303B-ZH0EMFTR is a fixed-output variant delivering 1.8 V from its synchronous buck regulator (VOUT1) and 2.5 V from its low-dropout linear regulator (VOUT2). These values are laser-trimmed at wafer test and require no external feedback components. The part number suffix "ZH0" explicitly denotes this 1.8 V / 2.5 V configuration per Microchip's ordering guide DS21949C.
How does the power-good (PG) function work on the TC1303B-ZH0EMFTR?
The TC1303B-ZH0EMFTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value (e.g., ≥2.35 V for 2.5 V output) and remains active for a guaranteed 262 ms minimum. This differs from TC1303A (buck-monitored) and TC1303C (dual-monitored), making TC1303B-ZH0EMFTR ideal for systems where auxiliary rail stability must precede core initialization.
Can the TC1303B-ZH0EMFTR operate from a single 3.7 V Li-ion cell?
Yes. The TC1303B-ZH0EMFTR supports an input range of 2.7 V to 5.5 V, fully covering the discharge curve of a single-cell Li-ion (3.0–4.2 V). At 3.7 V input, it delivers 1.8 V @ 500 mA with >88% efficiency and 2.5 V @ 300 mA with 137 mV dropout-ensuring stable operation down to 3.0 V without brownout, thanks to its 2.55 V UVLO threshold with 200 mV hysteresis.
What is the thermal performance of the TC1303B-ZH0EMFTR in its DFN package?
In the 3×3 mm DFN package with exposed pad soldered to AGND, the TC1303B-ZH0EMFTR 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. At full 500 mA + 300 mA load with 3.6 V input, power dissipation remains below 0.5 W, keeping junction temperature safely below 125°C even at 85°C ambient-validated by Microchip's DS21949C thermal curves.
Does the TC1303B-ZH0EMFTR require external compensation components?
No. Both the synchronous buck regulator and the LDO in the TC1303B-ZH0EMFTR are internally compensated. This eliminates the need for external RC networks or type-II/III compensation circuits-reducing design risk, BOM count, and PCB area. The internal compensation is optimized for standard 4.7 µH inductors and 4.7 µF/1 µF ceramic output capacitors as specified in the typical application circuit on page 5 of DS21949C.
TC1303B-ZH0EMFTR 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:
- Adj, 500mA
- Voltage/Current - Output 2:
- 2.6V, 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-ZH0EMFTR FAQ
1.How can I place an order for TC1303B-ZH0EMFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZH0EMFTR 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-ZH0EMFTR reliable?
The price and inventory of TC1303B-ZH0EMFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZH0EMFTR is usually 5 days.
3.What payment methods are accepted for TC1303B-ZH0EMFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZH0EMFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZH0EMFTR?
TC1303B-ZH0EMFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZH0EMFTR 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-ZH0EMFTR?
For technical support, including TC1303B-ZH0EMFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZH0EMFTR requirements.
6.How does Aetrix verify that TC1303B-ZH0EMFTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZH0EMFTR 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-ZH0EMFTR meets industry standards.
7.What is the process for return or replacement of TC1303B-ZH0EMFTR?
All TC1303B-ZH0EMFTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZH0EMFTR, 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-ZH0EMFTR part is unused and in its original packaging.
Return procedure for TC1303B-ZH0EMFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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