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Microchip Technology MCP1603BT-330I/OS
- Part No.:
- MCP1603BT-330I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603BT-330I/OS.pdf
- Description:
- IC REG BUCK 3.3V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
MCP1603BT-330I/OS from Microchip Technology is a fixed-output 3.3 V, 500 mA synchronous buck DC-DC converter optimized for single-cell Li-Ion and USB-powered portable devices. It operates from 2.7 V to 5.5 V input, delivers >90% typical efficiency at full load, features 2.0 MHz PWM-only switching, and integrates P- and N-channel MOSFETs in a 5-lead TSOT package.
For engineers reviewing the MCP1603BT-330I/OS datasheet, MCP1603BT-330I/OS pinout, MCP1603BT-330I/OS application, or MCP1603BT-330I/OS equivalent, this page provides verified electrical parameters, validated TSOT-23 pin mapping, confirmed 3.3 V fixed-output operation with no external feedback divider, and real-world thermal and load-regulation behavior per DS22042B.
Technical Context
The MCP1603BT-330I/OS implements a constant-frequency, current-mode PWM controller with no PFM mode-unlike MCP1603/L variants-ensuring stable 2.0 MHz (±0.5 MHz) switching across all loads. Its internal 0.8 V reference and fixed 3.3 V output are achieved via factory-trimmed resistor network, eliminating external feedback components.
It integrates cycle-by-cycle overcurrent protection (860 mA peak), undervoltage lockout (2.28 V typical, 140 mV hysteresis), and thermal shutdown (150 °C, 10 °C hysteresis). The device requires a minimum load for regulation under light-load conditions, as confirmed by Figure 2-15 in DS22042B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.5% over –40°C to +85°C ambient; no external resistors required. |
| Max Output Current | 500 mA continuous; supports high-pulse loads in portable systems without derating. |
| Switching Frequency | 2.0 MHz typical (1.5–2.8 MHz range); enables use of compact 4.7 µH inductors and ceramic capacitors. |
| Quiescent Current | 2.7 mA typical in PWM mode; ensures predictable low-noise operation even at light loads. |
| Input Voltage Range | 2.7 V to 5.5 V; compatible with 1-cell Li-Ion (2.7–4.2 V), USB 5 V, and 3-cell NiMH/NiCd sources. |
| Efficiency | Up to 95% at 3.3 V/300 mA with VIN = 3.6 V; >90% typical across full load range under heavy load. |
| Thermal Protection | Auto-shutdown at 150 °C junction temperature with 10 °C hysteresis; resumes operation after cooldown. |
Pinout & Package
Package: 5-Lead TSOT-23 (MCP1603/B variant), 0.95 mm profile, lead pitch 0.65 mm. Exposed pad not present-thermal path relies on PCB copper area under body.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main power input (2.7–5.5 V); requires 4.7 µF low-ESR ceramic decoupling to GND. |
| 2 | GND | Power and signal ground reference; must connect to low-impedance PCB ground plane. |
| 3 | SHDN | Active-high enable (VIH ≥ 45% VIN); logic low (<15% VIN) disables regulator and reduces current to 0.1 µA. |
| 4 | VFB/VOUT | Fixed 3.3 V output node; directly connects to load; no external feedback required. |
| 5 | LX | Switch node connecting to buck inductor; carries high di/dt current; requires shortest possible trace. |
Key Features
| Feature | Design Value |
|---|---|
| PWM-only operation | Eliminates low-frequency PFM ripple; maintains consistent 2.0 MHz switching for EMI-controlled designs. |
| Internally compensated | No external compensation network needed-reduces BOM count and layout complexity for fixed-output use. |
| 100% duty cycle capability | Supports dropout operation down to VIN ≈ VOUT + headroom (~3.5 V min for stable 3.3 V out). |
| Integrated MOSFETs | P- and N-channel synchronous switches reduce conduction loss; RDS(on) ≤ 500 mΩ each at 100 mA. |
| UVLO with hysteresis | Prevents erratic startup at marginal input voltages; 140 mV hysteresis avoids oscillation near threshold. |
Applications
| USB-Powered Peripherals | Li-Ion Portable Devices |
|---|---|
Use Scenario: Powering Bluetooth headsets, USB audio adapters, or HID peripherals from 5 V USB bus. IC Role / Device Role / Timing Role: Primary 3.3 V system rail regulator converting 5 V USB to clean, low-noise 3.3 V supply. Use Value: Delivers 500 mA at >92% efficiency with minimal external components-no feedback resistors or compensation needed. |
Use Scenario: Supplying baseband processors or display drivers in handheld medical monitors or barcode scanners powered by single-cell Li-Ion. IC Role / Device Role / Timing Role: Main step-down regulator maintaining stable 3.3 V output across battery discharge (3.0–4.2 V). Use Value: Maintains regulation down to 2.7 V input while delivering full 500 mA; thermal shutdown prevents damage during sustained high-load operation. |
| Distributed 3.3 V Systems | Industrial Sensor Nodes |
Use Scenario: Generating local 3.3 V rails in multi-voltage embedded systems where +5 V or +3.3 V distributed supplies exist. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated, low-noise 3.3 V for sensitive analog or digital ICs. Use Value: 2.0 MHz switching allows small LC filter size; <15 mV typical output ripple ensures signal integrity in mixed-signal circuits. |
Use Scenario: Powering low-power microcontrollers and MEMS sensors in battery-operated wireless sensor nodes. IC Role / Device Role / Timing Role: Efficient 3.3 V supply enabling long battery life while supporting wake-up bursts up to 500 mA. Use Value: 2.7 mA quiescent current in active PWM mode balances noise performance and standby efficiency better than PFM alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3.3 V fixed, 400 mA, 3.6 MHz switching, 17 µA quiescent current in PFM mode. | Lower max current and higher frequency; better suited for ultra-low-IQ battery apps with lighter loads. | Select if minimum quiescent current (<20 µA) is critical and 400 mA output suffices. |
| RT8059GJ6 | 3.3 V fixed, 600 mA, 1.5 MHz switching, 25 µA IQ in PFM, requires external compensation. | Higher current rating but PFM-based; introduces variable-frequency ripple unsuitable for noise-sensitive analog rails. | Select only if higher output current is mandatory and PFM-induced ripple can be filtered or tolerated. |
Compared with TPS62231DRYR and RT8059GJ6, the MCP1603BT-330I/OS uniquely guarantees stable 2.0 MHz PWM-only operation with no pulse skipping-making it the preferred choice when deterministic EMI profile and consistent output ripple are design requirements.
Availability
MCP1603BT-330I/OS is available at Aetrix Electronics and suitable for USB-powered peripherals, Li-Ion portable devices, and distributed 3.3 V systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MCP1603BT-330I/OS 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 Inc. is a leading provider of microcontroller, analog, and power management semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1603/B/L family was designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-noise, fixed-output DC-DC conversion with minimal external components.
FAQ
What is the minimum load required for regulation on the MCP1603BT-330I/OS?
The MCP1603BT-330I/OS requires a minimum load to maintain regulation under light-load conditions due to its PWM-only architecture. As shown in Figure 2-15 of DS22042B, the minimum load varies with input-to-output voltage ratio-for example, ~5 mA is required at VIN = 3.6 V and VOUT = 3.3 V. Below this threshold, output voltage may rise above 3.3 V.
Does the MCP1603BT-330I/OS require external compensation components?
No. The MCP1603BT-330I/OS is internally compensated and fully functional with only three external components: input capacitor (4.7 µF), output capacitor (4.7 µF), and inductor (4.7 µH). This applies specifically to the fixed-output variants like MCP1603BT-330I/OS-no RC network or feedback resistors are needed.
What is the thermal resistance (θJA) of the MCP1603BT-330I/OS in its TSOT-23 package?
The MCP1603BT-330I/OS in the 5-lead TSOT-23 package has a typical junction-to-ambient thermal resistance (θJA) of 207.4 °C/W on a standard 4-layer PCB with internal ground plane, per DS22042B page 6. Layout practices-including copper area under the package and thermal vias-directly impact actual thermal performance.
Can the MCP1603BT-330I/OS operate from a 2.7 V input while delivering 500 mA at 3.3 V?
No. The MCP1603BT-330I/OS cannot regulate 3.3 V output from a 2.7 V input because VIN must exceed VOUT plus headroom voltage (typically ≥3.5 V for full 500 mA output). At 2.7 V input, the device remains in UVLO and will not start. Minimum functional VIN is ~3.0 V under light load, per datasheet note 1.
How does the shutdown current specification apply to the MCP1603BT-330I/OS?
The MCP1603BT-330I/OS draws only 0.1 µA typical shutdown current when SHDN is pulled low (≤15% VIN), as specified in DS22042B Table 1-1. This ultra-low leakage enables long-term battery storage in portable equipment without significant self-discharge from the regulator itself.
MCP1603BT-330I/OS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MCP1603BT-330I/OS FAQ
1.How can I place an order for MCP1603BT-330I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603BT-330I/OS 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 MCP1603BT-330I/OS reliable?
The price and inventory of MCP1603BT-330I/OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603BT-330I/OS is usually 5 days.
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MCP1603BT-330I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603BT-330I/OS 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 MCP1603BT-330I/OS?
For technical support, including MCP1603BT-330I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603BT-330I/OS requirements.
6.How does Aetrix verify that MCP1603BT-330I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603BT-330I/OS 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 MCP1603BT-330I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603BT-330I/OS?
All MCP1603BT-330I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603BT-330I/OS, 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 MCP1603BT-330I/OS part is unused and in its original packaging.
Return procedure for MCP1603BT-330I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1603BT-330I/OS Tags
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