My Inquiry
My Account
Microchip Technology MCP1603LT-180I/OS
- Part No.:
- MCP1603LT-180I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603LT-180I/OS.pdf
- Description:
- IC REG BUCK 1.8V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1603LT-180I/OS from Microchip Technology is a fixed-output 1.8 V, 500 mA synchronous buck regulator optimized for single-cell Li-Ion and multi-cell NiMH/NiCd battery-powered portable electronics. It operates from 2.7 V to 5.5 V input, delivers >90% typical efficiency at full load, features 2.0 MHz PWM switching, automatic PFM/PWM mode transition, and integrated overtemperature and overcurrent protection. Used in USB-powered devices and digital cameras for compact, low-noise local regulation.
For engineers reviewing the MCP1603LT-180I/OS datasheet, MCP1603LT-180I/OS pinout, MCP1603LT-180I/OS application, or MCP1603LT-180I/OS equivalent, key selection criteria include its fixed 1.8 V output, 45 µA PFM quiescent current, TSOT-23-5 package with verified 5-pin mapping, thermal shutdown at 150°C, and compatibility with 4.7 µF ceramic input/output capacitors and 4.7 µH inductors.
Technical Context
The MCP1603LT-180I/OS implements a current-mode synchronous buck architecture with integrated P- and N-channel MOSFETs, enabling 100% duty cycle operation and eliminating external diode requirements. Its dual-mode control logic automatically transitions between 2.0 MHz fixed-frequency PWM (for low ripple under heavy load) and pulse-skipping PFM (for ultra-low 45 µA quiescent current at light load).
Internal compensation, 0.8 V reference feedback, undervoltage lockout with 2.28 V threshold and 140 mV hysteresis, and cycle-by-cycle 860 mA peak current limiting ensure stable regulation across -40°C to +85°C ambient without external loop components. The device requires no external voltage divider due to its factory-trimmed 1.8 V fixed output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% over -40°C to +85°C - eliminates need for external resistor divider and simplifies layout. |
| Max Output Current | 500 mA continuous - supports core logic rails in portable processors and imaging sensors. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with 1-cell Li-Ion (2.7–4.2 V), 2/3-cell NiMH/NiCd, and USB 5 V sources. |
| Quiescent Current | 45 µA typical in PFM mode - extends battery runtime in standby and low-power states. |
| Switching Frequency | 2.0 MHz typical in PWM mode - enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors. |
| Efficiency | >90% typical at 500 mA, VIN = 3.6 V, VOUT = 1.8 V - reduces thermal load in space-constrained enclosures. |
| Thermal Shutdown | 150°C junction temperature with 10°C hysteresis - provides robust fault recovery without external thermal management. |
Pinout & Package
Package: TSOT-23-5 (SOT-23 variant with 5 leads, 0.95 mm pitch, 2.9 mm × 1.6 mm footprint). Thermal pad not present - standard plastic body with exposed copper not applicable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power supply input | Accepts 2.7–5.5 V; requires 4.7 µF low-ESR ceramic decoupling capacitor placed adjacent to pin. |
| 2 (GND) | Ground reference | Primary return path for power and control circuits; must connect to solid ground plane with minimal trace inductance. |
| 3 (SHDN) | Enable/disable control | Logic-level input: >45% VIN enables regulator; <15% VIN disables with 0.1 µA shutdown current. |
| 4 (VFB/VOUT) | Output voltage sense / feedback | Direct connection to regulated 1.8 V output; no external divider required for fixed-voltage variants. |
| 5 (LX) | Switch node | Connects to buck inductor; carries high di/dt current - requires shortest possible trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode transition | Enables >90% efficiency across 0.1–500 mA load range without firmware or external control logic. |
| Internally compensated control loop | Eliminates need for external compensation network - reduces BOM count and design validation effort. |
| Integrated synchronous MOSFETs | P-Channel high-side and N-Channel low-side switches replace discrete FETs and catch diode - saves PCB area and improves efficiency. |
| Undervoltage lockout with hysteresis | 2.28 V turn-on threshold with 140 mV hysteresis prevents oscillation during brown-out conditions on weak battery sources. |
| 100% duty cycle capability | Maintains regulation down to VIN = VOUT - critical for maintaining 1.8 V output as Li-Ion discharges below 2.7 V. |
Applications
| Portable Medical Sensors | Digital Camera Image Sensors |
|---|---|
Use Scenario: Powering low-noise analog front-end and CMOS image sensor in handheld ultrasound or glucose monitors. IC Role / Device Role / Timing Role: Primary 1.8 V core supply for sensor ADCs and timing-critical pixel readout circuitry. Use Value: 2.0 MHz PWM operation minimizes output ripple (<15 mV), preserving signal integrity in sub-16-bit analog measurements. | Use Scenario: Supplying image sensor and ISP core voltage in compact digital still/video cameras. IC Role / Device Role / Timing Role: Fixed 1.8 V synchronous buck converter delivering clean, regulated power during burst capture and video streaming. Use Value: 45 µA PFM quiescent current extends standby time between shots while maintaining fast wake-up response. |
| USB-Powered Audio Accessories | Industrial Handheld Terminals |
Use Scenario: Regulating 5 V USB bus to 1.8 V for DACs, headphone amplifiers, and Bluetooth SoCs in portable DAC/headphone amps. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating noise-sensitive audio circuitry from noisy USB power domain. Use Value: >90% efficiency at 300 mA reduces heat buildup inside sealed aluminum enclosures, avoiding thermal derating. | Use Scenario: Providing 1.8 V logic rail for ARM Cortex-M microcontrollers and RFID/NFC readers in ruggedized field terminals. IC Role / Device Role / Timing Role: Main system regulator supporting cold-temperature operation (-40°C) and wide-input battery voltage swings. Use Value: UVLO with 140 mV hysteresis ensures reliable startup and shutdown across aging NiMH battery packs (1.0–1.4 V/cell). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | Fixed 1.8 V, 600 mA, 3 MHz switching, 17 µA IQ in PFM - higher frequency, lower quiescent current, DSBGA-6 package. | Requires tighter layout for 3 MHz operation; better suited for ultra-thin wearables where board area is more constrained than thermal budget. | Select when minimum IQ and smallest footprint are prioritized over proven industrial temperature range and TSOT-23 manufacturability. |
| Analog Devices ADP2301AUJZ-1.8-R7 | Fixed 1.8 V, 600 mA, 700 kHz switching, 30 µA IQ - lower frequency, higher peak current, SOT-23-6 package with separate EN and FB pins. | Larger inductor required (10 µH typical); less suitable for high-density portable designs but offers higher overload tolerance. | Select when robustness against short-term overloads and compatibility with legacy 700 kHz filter designs outweigh need for 2 MHz size reduction. |
Compared with TPS62231DRYR and ADP2301AUJZ-1.8-R7, the MCP1603LT-180I/OS delivers optimal balance of 2.0 MHz size efficiency, 45 µA PFM IQ, and TSOT-23-5 manufacturability for cost-sensitive portable equipment operating across -40°C to +85°C - without requiring redesign of existing 4.7 µH/4.7 µF layouts.
Availability
MCP1603LT-180I/OS is available at Aetrix Electronics and suitable for portable medical sensors, digital camera image sensors, USB-powered audio accessories, and industrial handheld terminals requiring stable component supply and long-term production continuity.
Supply support for MCP1603LT-180I/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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.
The MCP1603/B/L product line delivers highly integrated, low-quiescent-current synchronous buck regulators targeting battery-powered portable electronics where size, efficiency, and thermal performance are critical design constraints.
FAQ
What is the maximum continuous output current of the MCP1603LT-180I/OS?
The MCP1603LT-180I/OS delivers up to 500 mA of continuous output current at 1.8 V with input voltage between 2.7 V and 5.5 V. This rating assumes proper PCB layout with adequate thermal dissipation using the TSOT-23-5 package on a 4-layer board with internal ground plane. Derating applies above +85°C ambient.
Does the MCP1603LT-180I/OS require external compensation components?
No, the MCP1603LT-180I/OS is internally compensated. Its control loop is factory-tuned for stability with standard 4.7 µF ceramic input/output capacitors and a 4.7 µH shielded inductor - eliminating the need for external RC networks or loop compensation adjustments during design.
What shutdown current does the MCP1603LT-180I/OS draw when disabled?
When the SHDN pin is pulled low, the MCP1603LT-180I/OS draws a typical shutdown current of 0.1 µA, with a maximum of 1 µA over temperature. This ultra-low leakage preserves battery charge during extended storage or deep sleep modes in portable systems.
Can the MCP1603LT-180I/OS operate with input voltage equal to its 1.8 V output?
Yes, the MCP1603LT-180I/OS supports 100% duty cycle operation, allowing it to maintain regulation even when VIN drops to 1.8 V. This feature is essential for sustaining 1.8 V output as single-cell Li-Ion batteries discharge below 2.7 V, extending usable battery life in portable applications.
Is the MCP1603LT-180I/OS pin-compatible with other variants in the MCP1603 family?
Yes, the MCP1603LT-180I/OS shares identical TSOT-23-5 pinout and footprint with all MCP1603/L fixed-output variants (e.g., MCP1603T-120I/OS, MCP1603T-330I/OS), enabling drop-in replacement within the same voltage option group - provided PCB layout accommodates identical thermal and routing requirements.
MCP1603LT-180I/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MCP1603LT-180I/OS FAQ
1.How can I place an order for MCP1603LT-180I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603LT-180I/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 MCP1603LT-180I/OS reliable?
The price and inventory of MCP1603LT-180I/OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603LT-180I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603LT-180I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603LT-180I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603LT-180I/OS?
MCP1603LT-180I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603LT-180I/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 MCP1603LT-180I/OS?
For technical support, including MCP1603LT-180I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603LT-180I/OS requirements.
6.How does Aetrix verify that MCP1603LT-180I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603LT-180I/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 MCP1603LT-180I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603LT-180I/OS?
All MCP1603LT-180I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603LT-180I/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 MCP1603LT-180I/OS part is unused and in its original packaging.
Return procedure for MCP1603LT-180I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1603LT-180I/OS Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
