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Analog Devices Inc. LTC1878EMS8#TRPBF
- Part No.:
- LTC1878EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1878EMS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,774
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Product details
Overview
LTC1878EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous buck regulator using constant-frequency current-mode control. It delivers up to 600mA output current at 3.3V input, operates from 2.65V to 6V, achieves 95% peak efficiency, and features 10µA quiescent current in operation-ideal for Li-Ion-powered portable instrumentation and wireless modems.
For engineers reviewing the LTC1878EMS8#TRPBF datasheet, LTC1878EMS8#TRPBF pinout, LTC1878EMS8#TRPBF application, or LTC1878EMS8#TRPBF equivalent, key selection criteria include its 550kHz fixed switching frequency, selectable Burst Mode™ or pulse-skipping operation, 0.8V reference enabling low-output-voltage designs, internal P/N-channel MOSFETs eliminating external Schottky diodes, and robust overcurrent/overtemperature protection.
Technical Context
The LTC1878EMS8#TRPBF implements a current-mode, constant-frequency synchronous buck architecture with integrated 0.5Ω P-channel main switch and 0.6Ω N-channel synchronous rectifier. Its phase-locked loop (PLL) enables external synchronization from 400kHz to 700kHz via the SYNC/MODE pin, while internal slope compensation ensures stability above 40% duty cycle.
Burst Mode™ operation reduces quiescent current to 10µA by intermittently disabling both power switches when load demand falls below ~250mA peak inductor current; pulse-skipping mode remains active during synchronization and provides lower output ripple. Shutdown draws <1µA, and 100% duty-cycle dropout operation extends battery runtime under low-input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-Ion (2.7–4.2V) and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 600mA at VIN = 3.3V - sufficient for powering baseband processors, RF transceivers, or sensor subsystems in portable devices. |
| Switching Frequency | 550kHz (internal) or 400–700kHz (synchronized) - enables use of compact 10µH inductors and ceramic output capacitors. |
| Quiescent Current | 10µA in operation, <1µA in shutdown - minimizes battery drain during standby in always-on IoT endpoints. |
| Feedback Reference | 0.8V ±2% - allows precise programming of output voltages as low as 0.8V using standard resistor dividers. |
| RDS(ON) (P-MOSFET) | 0.5Ω typical - limits conduction loss during high-duty-cycle dropout operation (e.g., VIN = 2.8V → VOUT = 1.8V). |
| RDS(ON) (N-MOSFET) | 0.6Ω typical - eliminates need for external Schottky diode and improves light-load efficiency vs. asynchronous designs. |
Pinout & Package
Package: 8-lead MSOP (MS8), 3mm × 3mm, 0.65mm pitch, exposed pad for thermal enhancement. Pin 1 marked with dot; pin numbering counterclockwise from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pull ≥1.2V to enable regulator; pull ≤0.4V to enter <1µA shutdown - prevents unintended startup during power sequencing. |
| ITH (Pin 2) | Error amplifier compensation node | Controls peak inductor current threshold; voltage range 0.5–1.9V sets current limit and loop stability via external RC network. |
| VFB (Pin 3) | Feedback input | Compares resistive divider output against 0.8V reference to regulate VOUT; supports remote sensing for improved load regulation. |
| GND (Pin 4) | Analog/digital ground reference | Common return for feedback, error amp, and internal logic; must be connected to low-impedance PCB ground plane. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt square-wave current - requires short, wide trace and local high-frequency decoupling. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and power switches; requires low-ESR ceramic capacitor (≥22µF) placed within 2mm of pin. |
| SYNC/MODE (Pin 7) | Frequency sync & mode select | Tie to VIN for Burst Mode™; ground for pulse skipping; apply 400–700kHz clock for synchronization - no floating allowed. |
| PLL LPF (Pin 8) | Phase detector filter output | Drives external RC low-pass filter (e.g., 10kΩ + 2200pF) to stabilize PLL lock; left open if not synchronizing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | Eliminates external Schottky diode, reduces BOM count, and improves efficiency by 5–10% across 10mA–600mA load range. |
| Selectable light-load operation | Burst Mode™ cuts IQ to 10µA for battery life extension; pulse skipping maintains low ripple (<20mVPP) in noise-sensitive audio sections. |
| 100% duty-cycle dropout | Enables VOUT regulation down to VIN – ILOAD×RDS(ON), critical for maintaining system operation as Li-Ion discharges from 4.2V to 2.8V. |
| Overvoltage lockout (OVL) | Triggers at VFB + 20–110mV to protect downstream ICs during transient events or feedback divider failure. |
| Thermal shutdown | Disables both switches at ~150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V/1.8V) from single Li-Ion cell in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable, low-noise DC supply with fast load-transient response to handle bursty CPU activity. Use Value: 95% efficiency at 300mA extends talk time; Burst Mode™ reduces standby current to preserve battery charge between calls. | Use Scenario: Supplying 3.3V I/O and 1.8V RF section in LTE Cat-1 embedded modems for industrial telemetry. IC Role / Device Role / Timing Role: Synchronous buck converter managing dynamic load steps from 1mA (idle) to 500mA (transmit burst) without output droop. Use Value: Current-mode control ensures <50µs recovery from 50% load step; 0.8V reference enables precise 1.8V rail generation. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Generating 2.5V analog front-end supply in handheld multimeters or gas detectors with 10-year battery life target. IC Role / Device Role / Timing Role: High-efficiency, ultra-low-IQ regulator powering precision ADCs, op-amps, and microcontroller peripherals. Use Value: 10µA operating IQ and <1µA shutdown minimize self-discharge; ±2% output accuracy ensures measurement repeatability. | Use Scenario: Providing 1.5V core voltage to ARM Cortex-M4 MCU in portable medical sensors (e.g., pulse oximeters). IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter operating continuously from 2.65V–4.2V Li-Po input with minimal board space. Use Value: MS8 package fits tight layouts; 100% duty cycle sustains regulation until battery reaches 2.7V, maximizing usable capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed frequency, 300mA output, 2.05–6.5V input, 17µA IQ in PWM mode | Better suited for space-constrained apps needing smaller inductors; lower max current limits use in higher-power systems | Select when board area is critical and load ≤300mA; verify 3MHz switching compatibility with EMI requirements. |
| MAX17503GCU+T | 4.5–60V input, 600mA output, adjustable frequency 200kHz–2.2MHz, 100µA IQ | Designed for industrial/high-VIN applications; lacks Burst Mode™ and ultra-low-IQ optimization for battery use | Choose only for wide-input systems (>12V); not recommended for Li-Ion due to higher quiescent current and no 100% duty cycle. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC1878EMS8#TRPBF uniquely balances ultra-low 10µA operating IQ, 600mA capability, and 100% duty-cycle dropout-making it optimal for long-life, single-cell Li-Ion portable equipment where efficiency at light loads and deep discharge support are essential.
Availability
LTC1878EMS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, portable instruments, and battery-powered equipment requiring stable component supply across extended production lifecycles.
Supply support for LTC1878EMS8#TRPBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1878EMS8#TRPBF belongs to Linear's legacy high-efficiency DC-DC converter family, engineered specifically for battery-operated portable electronics demanding ultra-low quiescent current, wide input range, and robust protection in minimal footprint.
FAQ
What is the maximum output current capability of the LTC1878EMS8#TRPBF at 3.3V input?
The LTC1878EMS8#TRPBF delivers up to 600mA output current when VIN = 3.3V, as confirmed in the datasheet's "Features" section and Figure 1 (Maximum Output Current vs Input Voltage). This rating assumes proper thermal design with the MS8 package's θJA = 150°C/W and ambient temperature ≤85°C. At lower input voltages (e.g., 2.65V), max output current decreases due to increased RDS(ON) and reduced headroom.
Does the LTC1878EMS8#TRPBF require an external Schottky diode?
No, the LTC1878EMS8#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling fully synchronous operation that eliminates diode forward-drop losses and improves efficiency-especially at medium-to-high loads. This is explicitly stated in the "Features" list and functional block diagram.
How does Burst Mode™ operation affect the output voltage ripple of the LTC1878EMS8#TRPBF?
Burst Mode™ operation in the LTC1878EMS8#TRPBF increases low-frequency output voltage ripple (typically 10–100kHz envelope) because the regulator cycles on/off to maintain regulation at light loads. As shown in Typical Performance Characteristic G14, this results in periodic bursts of switching activity. For audio-sensitive applications, tie SYNC/MODE to GND to force pulse-skipping mode, which maintains constant 550kHz operation and reduces ripple to <20mVPP.
What is the purpose of the PLL LPF pin (Pin 8) on the LTC1878EMS8#TRPBF?
The PLL LPF pin (Pin 8) on the LTC1878EMS8#TRPBF serves as the output of the internal phase detector and control input to the voltage-controlled oscillator (VCO). When synchronizing to an external clock, an RC low-pass filter (e.g., 10kΩ + 2200pF) is connected from this pin to GND to smooth phase-error current pulses and stabilize the locked frequency. If not used for synchronization, the pin may be left open per the Absolute Maximum Ratings table.
Can the LTC1878EMS8#TRPBF operate with input voltage below 2.65V?
No, the LTC1878EMS8#TRPBF has a specified minimum input voltage of 2.65V, as defined in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this voltage is not guaranteed and may result in improper regulation, failure to start, or undefined behavior. The device is optimized for single Li-Ion (2.7–4.2V) and regulated 3.3V/5V supplies - attempting sub-2.65V operation violates its design envelope.
LTC1878EMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.65V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 600mA
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1878EMS8#TRPBF FAQ
1.How can I place an order for LTC1878EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1878EMS8#TRPBF 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 LTC1878EMS8#TRPBF reliable?
The price and inventory of LTC1878EMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1878EMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1878EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1878EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1878EMS8#TRPBF?
LTC1878EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1878EMS8#TRPBF 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 LTC1878EMS8#TRPBF?
For technical support, including LTC1878EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1878EMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1878EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1878EMS8#TRPBF 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 LTC1878EMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1878EMS8#TRPBF?
All LTC1878EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1878EMS8#TRPBF, 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 LTC1878EMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1878EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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