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Microchip Technology TC1303B-ZA0EMFTR
- Part No.:
- TC1303B-ZA0EMFTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-ZA0EMFTR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,509
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Product details
Overview
TC1303B-ZA0EMFTR 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 LDO output only. It delivers 1.8 V at 500 mA (VOUT1) and 3.3 V at 300 mA (VOUT2), operates from 2.7–5.5 V input, and features 65 µA typical quiescent current and 2.0 MHz fixed-frequency PWM switching. It is designed for portable USB-powered devices requiring sequenced dual-rail supplies.
For engineers reviewing the TC1303B-ZA0EMFTR datasheet, TC1303B-ZA0EMFTR pinout, TC1303B-ZA0EMFTR application, or TC1303B-ZA0EMFTR equivalent, this page provides verified functional identity, validated package mapping (10-pin DFN, 3×3 mm), confirmed pin roles including push-pull PG output tied to VOUT2, exact shutdown control separation (SHDN1 for buck, SHDN2 for LDO), and real-world efficiency/thermal performance across -40°C to +125°C junction range.
Technical Context
The TC1303B-ZA0EMFTR implements independent enable logic: SHDN1 controls the buck regulator (VOUT1), while SHDN2 independently enables the LDO (VOUT2). Its power-good (PG) output is a push-pull driver monitoring only VOUT2 regulation at 94% threshold with 300 ms delay-distinct from TC1303A (monitors VOUT1) and TC1303C/TC1304 (dual-monitoring).
Internally compensated architecture eliminates external compensation components. The buck stage transitions automatically between PWM (heavy load) and PFM (light load) modes to maintain high efficiency (>90% typical at 500 mA) and ultra-low quiescent current. The LDO uses a single 1 µF ceramic output capacitor and exhibits 137 mV dropout at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8 V, 500 mA max - core voltage rail for low-power processors or SoCs |
| Output 2 (LDO) | 3.3 V, 300 mA max - bias supply for I/O, USB PHY, or analog circuitry |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable systems |
| Switching Frequency | 2.0 MHz fixed - allows use of small 4.7 µH inductor and compact layout |
| Power-Good Output | Push-pull, monitors VOUT2 only, 300 ms delay - directly drives processor RESET line without pull-up |
| Operating Junction Temp | -40°C to +125°C - qualified for industrial and extended-temperature embedded applications |
| Dropout Voltage (LDO) | 137 mV @ 200 mA - supports 3.3 V output from 3.437 V minimum input |
Pinout & Package
TC1303B-ZA0EMFTR is housed in a thermally enhanced 10-pin DFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad connected to AGND. This package supports 41°C/W junction-to-ambient thermal resistance on a 4-layer PCB with internal ground plane and two vias under the pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN2 | LDO shutdown control input | Active-high logic input (VIH ≥ 45% VIN); enables/disables VOUT2 independently of buck stage |
| 2 - VIN2 | LDO input supply | Accepts 2.7–5.5 V; must be short-traced to VIN1 to minimize noise coupling into LDO path |
| 3 - VOUT2 | LDO regulated output | 3.3 V fixed output; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 - PG | Power-good status output | Push-pull driver indicating VOUT2 is within 94% of regulation; no external pull-up needed |
| 5 - AGND | Analog ground reference | Must connect to clean analog ground plane; separate from PGND to avoid switching noise injection |
| 6 - PGND | Power ground return | High-current return path for buck switch node (LX); ties to power ground plane with low-inductance routing |
| 7 - LX | Buck switch node | Connects to external 4.7 µH inductor and catch diode (integrated MOSFETs); critical for EMI control |
| 8 - VIN1 | Buck input supply | Primary input for buck stage; shares source with VIN2 but routed separately for optimal decoupling |
| 9 - SHDN1 | Buck shutdown control input | Active-high logic input (VIH ≥ 45% VIN); enables/disables VOUT1 independently of LDO |
| 10 - VFB1/VOUT1 | Buck feedback or output | Configured as VOUT1 (1.8 V fixed) - connect directly to output capacitor; no divider required |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown control | SHDN1 and SHDN2 allow staggered power sequencing - e.g., enable LDO first for bias before enabling buck core rail |
| Internally compensated regulators | Eliminates need for external compensation networks on both buck and LDO, reducing BOM count and layout complexity |
| Automatic PWM-to-PFM mode transition | Maintains >85% efficiency down to 1 mA load without firmware intervention or external mode-select pins |
| Low-noise LDO with 62 dB PSRR | Rejects up to 62 dB of low-frequency ripple (≤100 Hz) on VIN2 - critical for noise-sensitive analog/RF subsystems |
| Thermal and overcurrent protection | Integrated 165°C thermal shutdown with 10°C hysteresis and cycle-by-cycle current limiting on both outputs |
Applications
| USB-Powered Portable Instrument | Handheld Medical Sensor |
|---|---|
|
Use Scenario: Battery-powered glucose meter with microcontroller, LCD, and analog front-end. IC Role / Device Role / Timing Role: Dual-rail power source: 1.8 V for MCU core and 3.3 V for LCD driver and sensor interface. Use Value: 65 µA quiescent current extends CR2032 battery life beyond 18 months in standby; push-pull PG directly asserts MCU reset during brownout. |
Use Scenario: Portable pulse oximeter with optical sensor, ADC, and Bluetooth LE radio. IC Role / Device Role / Timing Role: Provides clean 3.3 V for RF transceiver and 1.8 V for low-power MCU, with independent shutdown for sleep/wake control. Use Value: 137 mV LDO dropout enables full 3.3 V operation down to 3.437 V battery voltage; 62 dB PSRR prevents RF noise from corrupting ADC readings. |
| Industrial IoT Edge Node | Embedded USB-C Peripheral |
|
Use Scenario: Temperature/humidity sensor node powered via USB-C PD (5 V input) with LoRaWAN radio. IC Role / Device Role / Timing Role: Generates 1.8 V for microcontroller and 3.3 V for LoRa transceiver and sensor interface from shared 5 V rail. Use Value: 2.0 MHz switching frequency allows use of tiny 4.7 µH inductor; -40°C to +125°C rating ensures reliability in uncontrolled environments. |
Use Scenario: USB-C audio adapter with DAC, headphone amp, and USB interface controller. IC Role / Device Role / Timing Role: Supplies 1.8 V to USB controller and 3.3 V to DAC/analog stages, with PG asserting system reset on LDO undervoltage. Use Value: Independent SHDN1/SHDN2 enables hardware-controlled power gating of digital vs. analog domains; 1 µF LDO output cap minimizes board area. |
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-ZA0EMFTR | Monitors both VOUT1 and VOUT2 for PG assertion; same pinout and package | Required when system-level reset must depend on stability of both rails simultaneously | Select if coordinated power-good signaling across buck and LDO is mandatory; otherwise TC1303B-ZA0EMFTR offers simpler LDO-only monitoring. |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO), 2.25 MHz switching, higher IQ (80 µA), QFN-24 package | Supports more complex SoC power trees (e.g., core + I/O + memory rails); larger footprint and higher cost | Choose when three regulated rails are needed; TC1303B-ZA0EMFTR remains optimal for cost- and space-constrained dual-rail designs. |
Compared with TC1303C-ZA0EMFTR, the TC1303B-ZA0EMFTR simplifies reset logic by tying PG exclusively to VOUT2, reducing validation effort for LDO-critical subsystems; versus TPS65023RGZR, it trades rail count and feature depth for minimal size, lower IQ, and direct drop-in compatibility in existing DFN-10 layouts.
Availability
TC1303B-ZA0EMFTR is available at Aetrix Electronics and suitable for USB-powered portable instruments, handheld medical sensors, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-ZA0EMFTR 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 devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 family was engineered specifically for space-constrained, battery-operated portable electronics needing highly integrated dual-rail power solutions with ultra-low quiescent current and robust thermal performance.
FAQ
What output voltages does the TC1303B-ZA0EMFTR provide?
The TC1303B-ZA0EMFTR delivers fixed 1.8 V at up to 500 mA from its synchronous buck regulator (VOUT1) and fixed 3.3 V at up to 300 mA from its low-dropout linear regulator (VOUT2). These values are factory-programmed and require no external feedback resistors. The part number suffix "ZA0" explicitly denotes this 1.8 V / 3.3 V configuration per Microchip's ordering guide DS21949C.
How does the power-good (PG) output function on the TC1303B-ZA0EMFTR?
The TC1303B-ZA0EMFTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches 94% of its nominal 3.3 V value and holds active for a guaranteed 300 ms after startup. This differs from TC1303A (PG monitors VOUT1) and TC1303C/TC1304 (PG monitors both outputs). No external pull-up resistor is needed due to the push-pull structure.
Can the TC1303B-ZA0EMFTR operate from a single 3.6 V Li-ion battery?
Yes - the TC1303B-ZA0EMFTR supports input voltages from 2.7 V to 5.5 V, making it fully compatible with single-cell Li-ion (3.0–4.2 V) and Li-polymer batteries. At 3.6 V input, the 137 mV LDO dropout ensures stable 3.3 V output down to 3.437 V battery voltage, and the buck regulator maintains >90% efficiency across the full load range.
What is the thermal performance of the TC1303B-ZA0EMFTR in its DFN package?
In the 10-pin DFN package (3 mm × 3 mm), the TC1303B-ZA0EMFTR 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 and 300 mA LDO operation at ambient temperatures up to +85°C without derating, supported by integrated 165°C thermal shutdown with 10°C hysteresis.
Does the TC1303B-ZA0EMFTR require external compensation components?
No - both the synchronous buck regulator and the LDO in the TC1303B-ZA0EMFTR are internally compensated. This eliminates the need for external compensation capacitors or resistors on either regulator loop, reducing bill-of-materials count, PCB area, and design validation effort. Stability is guaranteed across all operating conditions specified in the datasheet DS21949C.
TC1303B-ZA0EMFTR 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:
- 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-DFN (3x3)
TC1303B-ZA0EMFTR FAQ
1.How can I place an order for TC1303B-ZA0EMFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZA0EMFTR 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-ZA0EMFTR reliable?
The price and inventory of TC1303B-ZA0EMFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZA0EMFTR is usually 5 days.
3.What payment methods are accepted for TC1303B-ZA0EMFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZA0EMFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZA0EMFTR?
TC1303B-ZA0EMFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZA0EMFTR 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-ZA0EMFTR?
For technical support, including TC1303B-ZA0EMFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZA0EMFTR requirements.
6.How does Aetrix verify that TC1303B-ZA0EMFTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZA0EMFTR 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-ZA0EMFTR meets industry standards.
7.What is the process for return or replacement of TC1303B-ZA0EMFTR?
All TC1303B-ZA0EMFTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZA0EMFTR, 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-ZA0EMFTR part is unused and in its original packaging.
Return procedure for TC1303B-ZA0EMFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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