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Microchip Technology TC1303B-ZS0EMF
- Part No.:
- TC1303B-ZS0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-ZS0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,806
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Product details
Overview
TC1303B-ZS0EMF 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, features 65 µA typical quiescent current, and supports -40°C to +125°C junction temperature - ideal for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-ZS0EMF datasheet, TC1303B-ZS0EMF pinout, TC1303B-ZS0EMF application, or TC1303B-ZS0EMF equivalent, key selection criteria include its LDO-monitored PG output, independent SHDN1/SHDN2 control, 2.0 MHz fixed-frequency PWM operation, 137 mV typical dropout at 200 mA (VOUT2), and compatibility with 1 µF ceramic output capacitors on both rails.
Technical Context
The TC1303B-ZS0EMF implements a synchronous buck regulator with automatic PWM-to-PFM mode transition under light load, maintaining high efficiency (>90% typical) and low output noise. Its internal compensation eliminates external loop components, while the integrated 2.0 MHz oscillator enables compact filter design using a 4.7 µH inductor and 4.7 µF output capacitor.
The LDO section provides a stable 3.3 V auxiliary rail with ±0.3% output voltage tolerance, 25 ppm/°C temperature coefficient, and 62 dB PSRR at ≤100 Hz. Power-good logic monitors only VOUT2 with 94% threshold high, 89% threshold low, and a push-pull output - distinguishing it from TC1303A (buck-monitored PG) and TC1303C/TC1304 (dual-monitored PG).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8 V @ 500 mA, adjustable 0.8–4.5 V via feedback divider; 280 mV dropout at 500 mA |
| Output 2 (LDO) | 3.3 V @ 300 mA, fixed output; 137 mV typical dropout at 200 mA |
| Quiescent Current | 65 µA typical total device IQ; 38 µA buck-only, 46 µA LDO-only in active mode |
| Switching Frequency | 2.0 MHz fixed PWM (heavy load); auto transitions to PFM at light load for ultra-low IQ |
| Power-Good Logic | Push-pull PG output monitoring VOUT2 only; 94% VOUT2 threshold high, 300 ms delay |
| Operating Temp | -40°C to +125°C junction temperature; thermal shutdown at 165°C with 10°C hysteresis |
| Input Voltage Range | 2.7 V to 5.5 V; undervoltage lockout at 2.55 V nominal with 200 mV hysteresis |
Pinout & Package
TC1303B-ZS0EMF is housed in a 10-lead 3×3 mm DFN package with exposed pad (EP), requiring connection to AGND for thermal and electrical performance. Pin assignments are validated per DS21949C-page 3 and page 5 schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high logic input; >45% VIN enables VOUT2; <15% VIN disables LDO |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1 (2.7–5.5 V); must be routed short and low-inductance to VIN1 |
| 3 (VOUT2) | LDO regulated output | 3.3 V fixed output; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good indicator | Push-pull output asserting when VOUT2 reaches 94% of regulation; used for processor reset timing |
| 5 (AGND) | Analog ground reference | Must connect to analog ground plane; separate from PGND to minimize noise coupling |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; ties to LX and VIN1 return |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; integrates P/N-channel MOSFETs (450 mΩ RDSon each) |
| 8 (VIN1) | Buck input supply | Main input for buck stage (2.7–5.5 V); tie directly to VIN2 with minimal trace length |
| 9 (SHDN1) | Buck shutdown control | Independent active-high enable for buck regulator; decouples sequencing from LDO control |
| 10 (VFB1/VOUT1) | Buck feedback/sense | For fixed 1.8 V output: connect directly to VOUT1; for adjustable: use resistor divider to set VOUT1 |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | Separate SHDN1 (buck) and SHDN2 (LDO) pins enable flexible power sequencing without external logic |
| Internally compensated regulators | Eliminates need for external compensation components on either buck or LDO loop - reduces BOM and layout complexity |
| Low-noise 2.0 MHz switching | Enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors, minimizing solution size and EMI |
| Ultra-low quiescent current | 65 µA typical total IQ extends battery life in always-on portable applications such as handheld medical devices |
| LDO with 1 µF output capacitor support | Reduces board area and cost versus traditional LDOs requiring ≥10 µF tantalum or aluminum electrolytic |
Applications
| Portable Medical Instrumentation | USB-Powered Devices |
|---|---|
Use Scenario: Battery-operated glucose meters and pulse oximeters requiring dual-rail power with strict low-power and reliability constraints. IC Role / Device Role / Timing Role: Provides 1.8 V core voltage for microcontroller and 3.3 V I/O rail for sensors/USB interface; PG signal triggers system reset on LDO fault. Use Value: 137 mV LDO dropout ensures stable 3.3 V output down to 3.437 V input, maximizing usable battery range from single Li-ion cell. | Use Scenario: Compact USB-C peripherals like dongles and adapters needing efficient dual-voltage conversion from 5 V bus. IC Role / Device Role / Timing Role: Generates 1.8 V for USB PHY logic and 3.3 V for interface ICs; 2.0 MHz switching avoids USB 2.0/3.0 frequency bands. Use Value: 90%+ buck efficiency at 500 mA minimizes self-heating in sealed enclosures; PG delay aligns with USB enumeration timing. |
| Handheld Industrial Scanner | Low-Power IoT Sensor Node |
Use Scenario: Rugged barcode scanners powered by rechargeable batteries, demanding robust power sequencing and thermal resilience. IC Role / Device Role / Timing Role: Supplies 1.8 V to imaging sensor ASIC and 3.3 V to Bluetooth radio; independent SHDN1/SHDN2 enables staggered wake-up. Use Value: -40°C to +125°C operating range supports deployment in uncontrolled environments; overtemperature protection prevents field failures. | Use Scenario: Wireless environmental sensors deployed in remote locations with multi-year battery life requirements. IC Role / Device Role / Timing Role: Powers MCU (1.8 V) and RF transceiver (3.3 V); auto PFM mode reduces IQ to sub-100 µA during sleep cycles. Use Value: 65 µA typical total IQ enables >5-year operation on CR2032; 1 µF LDO output cap simplifies PCB layout for space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16321-330I/MS | Single-output 3.3 V buck (600 mA); no integrated LDO or PG monitoring | Requires external LDO and reset supervisor for dual-rail designs | Select when only 3.3 V rail is needed and board space allows discrete supervision |
| TPS65023RSBR | Triple-output PMIC (2 buck + 1 LDO); 2.0 MHz switching; PG monitors all outputs | Higher integration but larger 4×4 mm QFN package and higher IQ (120 µA) | Select when three regulated rails are required and thermal budget permits higher dissipation |
Compared with MCP16321-330I/MS and TPS65023RSBR, TC1303B-ZS0EMF uniquely balances dual-rail integration, ultra-low IQ, and LDO-specific PG assertion in a 3×3 mm DFN - making it optimal for space- and battery-limited 2-rail systems where LDO rail integrity is critical.
Availability
TC1303B-ZS0EMF is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered devices, and handheld industrial scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-ZS0EMF 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, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The TC1303 family is designed for space-constrained, battery-powered applications needing dual regulated supplies - emphasizing low quiescent current, small footprint, and seamless integration of switching and linear regulation.
FAQ
What output voltages does the TC1303B-ZS0EMF provide?
The TC1303B-ZS0EMF provides two fixed output voltages: VOUT1 = 1.8 V (buck regulator, 500 mA max) and VOUT2 = 3.3 V (LDO, 300 mA max). The buck output can be adjusted from 0.8 V to 4.5 V using an external feedback divider connected to the VFB1 pin, but the ZS0EMF variant is factory-configured for 1.8 V. The LDO output is fixed at 3.3 V and cannot be adjusted.
How does the power-good (PG) function operate in TC1303B-ZS0EMF?
The TC1303B-ZS0EMF features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value and deasserts when VOUT2 falls ≤89%. The PG signal includes a built-in 300 ms delay, making it suitable for processor reset timing. This differs from TC1303A (PG monitors buck only) and TC1303C/TC1304 (PG monitors both rails).
What is the recommended output capacitance for TC1303B-ZS0EMF?
The TC1303B-ZS0EMF requires a minimum 4.7 µF ceramic capacitor on the buck output (VOUT1) and a minimum 1 µF ceramic capacitor on the LDO output (VOUT2), both placed close to their respective pins and referenced to AGND. These values ensure stability, transient response, and compliance with Microchip's design guidelines in DS21949C. Larger values improve ripple suppression but are not required.
Does TC1303B-ZS0EMF support power sequencing between its two outputs?
No, TC1303B-ZS0EMF does not implement automatic sequencing. It provides independent shutdown controls (SHDN1 for buck, SHDN2 for LDO), allowing designers to externally sequence turn-on/turn-off using GPIOs or RC delays. In contrast, the TC1304 variant includes internal sequencing circuitry. For TC1303B-ZS0EMF, sequencing must be implemented at the system level.
What package type and thermal characteristics apply to TC1303B-ZS0EMF?
TC1303B-ZS0EMF uses a 10-lead 3×3 mm DFN package with exposed thermal pad (EP), which must be soldered to AGND for optimal thermal performance. Its typical junction-to-ambient thermal resistance (θJA) is 41°C/W on a 4-layer board with internal ground plane and two vias under the EP. The device includes thermal shutdown at 165°C with 10°C hysteresis.
TC1303B-ZS0EMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tube
- 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:
- 1.5V, 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-ZS0EMF FAQ
1.How can I place an order for TC1303B-ZS0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZS0EMF 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-ZS0EMF reliable?
The price and inventory of TC1303B-ZS0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZS0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-ZS0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZS0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZS0EMF?
TC1303B-ZS0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZS0EMF 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-ZS0EMF?
For technical support, including TC1303B-ZS0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZS0EMF requirements.
6.How does Aetrix verify that TC1303B-ZS0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZS0EMF 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-ZS0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-ZS0EMF?
All TC1303B-ZS0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZS0EMF, 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-ZS0EMF part is unused and in its original packaging.
Return procedure for TC1303B-ZS0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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