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Analog Devices Inc. LTC3448EMS8E#TRPBF
- Part No.:
- LTC3448EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3448EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
LTC3448EMS8E#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter with integrated automatic LDO mode, designed for single Li-Ion battery-powered systems. It delivers up to 600mA output current, operates from 2.5V to 5.5V input, supports 1.5MHz or 2.25MHz switching, and maintains <5mVP-P ripple in LDO mode at ≤3mA load - ideal for noise-sensitive portable power rails.
For engineers reviewing the LTC3448EMS8E#TRPBF datasheet, LTC3448EMS8E#TRPBF pinout, LTC3448EMS8E#TRPBF application, or LTC3448EMS8E#TRPBF equivalent, key selection criteria include its dual-mode operation (PWM + auto-LDO), 0.6V feedback reference enabling 1.5V fixed-output configuration, thermal-enhanced 8-lead MSOP package, and guaranteed –40°C to 85°C operation with overtemperature protection.
Technical Context
The LTC3448EMS8E#TRPBF uses a constant-frequency, current-mode architecture with internal P-channel and N-channel synchronous MOSFETs, eliminating external Schottky diodes. Its control loop integrates slope compensation to prevent subharmonic oscillation above 40% duty cycle while preserving full 1.3A peak inductor current capability across all operating conditions.
Automatic transition between buck and linear regulator modes is governed by the MODE pin state and load current thresholds (ILDO(ON) = 3–5mA, ILDO(OFF) = 8–17mA), with LDO mode delivering ultra-low ripple via VOUT-sourced regulation and requiring ≥2µF output capacitance for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-Ion (2.7V–4.2V) with headroom for full discharge and charging transients. |
| Max Output Current | 600mA in buck mode - sufficient for core logic rails in portable instruments and digital cameras. |
| Switching Frequency | 1.5MHz or 2.25MHz - enables use of compact 2.2µH surface-mount inductors and low-ESR ceramic capacitors. |
| Feedback Reference | 0.6V ±1.5% - allows precise 1.5V output with standard resistor divider (e.g., 150kΩ/100kΩ) and remote sensing. |
| Quiescent Current | 32µA in LDO mode - extends battery life during standby in cellular telephones and MP3 players. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or power-off states. |
| Efficiency Peak | 96% at 300mA - minimizes thermal stress and power loss in thermally constrained 3mm × 3mm MSOP layout. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E), thermally enhanced with exposed pad (Pin 9) soldered to PCB ground plane for θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback Input | Connects to resistive divider; regulates output by comparing divided VOUT to 0.6V reference. |
| VOUT (Pin 2) | Output & LDO Source | Delivers regulated output; supplies up to 25mA in LDO mode; requires ≥2µF capacitor for loop stability. |
| MODE (Pin 3) | LDO Control | GND = LDO disabled; VIN = LDO always on; VOUT = auto-switching at ~3–5mA threshold. |
| VIN (Pin 4) | Main Power Input | Accepts 2.5V–5.5V; must be decoupled with ≥2.2µF ceramic capacitor close to pin. |
| SW (Pin 5) | Switch Node | Connects to inductor; carries high dv/dt switching waveform; requires tight layout to minimize EMI. |
| FREQ (Pin 6) | Frequency Select | Low = 1.5MHz; High = 2.25MHz; floating not allowed - ties to GND or VIN for fixed operation. |
| SYNC (Pin 7) | External Clock Input | Accepts 1.5–4MHz external oscillator; overrides FREQ setting when active; enables multi-rail synchronization. |
| RUN (Pin 8) | Enable/Shutdown | >1.5V = active; <0.3V = shutdown (<1µA IQ); must not float - pull down via resistor if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Auto LDO Mode | Seamlessly transitions to linear regulation below 3mA load, reducing output ripple to <5mVP-P without external components. |
| Synchronous Buck Architecture | Integrates P- and N-channel MOSFETs (RDS(ON) = 0.4Ω / 0.35Ω), eliminating Schottky loss and boosting efficiency to 96%. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VIN – 0.3V, extending usable battery life in deep-discharge portable applications. |
| Current-Mode Control | Delivers fast transient response to load steps (e.g., 100µA → 200mA in 10µs) with inherent cycle-by-cycle current limiting. |
| Overtemperature Protection | Thermal shutdown activates at TJ = 125°C; resumes operation after cooldown - prevents permanent damage during overload. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor I/O and RF front-end bias rails during burst transmission. IC Role / Device Role / Timing Role: Dual-mode regulator supplying stable 1.5V/1.8V from declining Li-Ion cell (3.6V → 2.8V). Use Value: Auto-LDO mode suppresses switching noise during sensitive RF receive windows, preventing desense without sacrificing efficiency during transmit. | Use Scenario: Supplying image sensor analog core and ADC reference voltage in compact camera modules. IC Role / Device Role / Timing Role: Low-noise 1.5V rail generator with <5mVP-P ripple in LDO mode during exposure readout. Use Value: Eliminates need for separate LDO post-regulator, reducing BOM count and PCB area while meeting stringent analog PSRR requirements. |
| MP3 Players | Portable Instruments |
Use Scenario: Powering DSP and audio codec during playback with variable load (10mA idle → 300mA decode). IC Role / Device Role / Timing Role: Adaptive power converter switching between high-efficiency PWM and ultra-quiet LDO based on audio processing load. Use Value: Maintains >90% efficiency across full dynamic range while ensuring zero audible switching artifacts in headphone output. | Use Scenario: Regulating microcontroller core voltage and precision sensor excitation in handheld test equipment. IC Role / Device Role / Timing Role: Primary 1.5V supply with guaranteed –40°C to 85°C operation and thermal shutdown for field reliability. Use Value: Exposed-pad MSOP package enables robust thermal performance in sealed enclosures without heatsinks or forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-mode buck-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | Fixed 1.5V output; no LDO mode; 3MHz switching; 300mA max; 2.05V–6.5V input. | Lower current, higher frequency, no auto-LDO - suitable only where ultra-low ripple is not required. | Select only if board space is critical and LDO functionality is unnecessary; verify 300mA suffices for target load. |
| MAX8640YETA+ | 1.5V fixed output; includes I²C programmability; 600mA; 2.6V–5.5V input; no auto-LDO. | Requires external control for mode switching; lacks seamless LDO transition - adds firmware complexity. | Choose when digital configurability (voltage scaling, sequencing) outweighs analog simplicity of LTC3448EMS8E#TRPBF. |
Compared with TPS62260DRVR and MAX8640YETA+, the LTC3448EMS8E#TRPBF uniquely integrates automatic LDO mode with synchronous buck operation in a single IC, enabling true "set-and-forget" ultra-low-noise regulation without external control or additional components - a critical advantage for battery-powered audio and RF subsystems.
Availability
LTC3448EMS8E#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, MP3 players, portable instruments, and wireless modems requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3448EMS8E#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3448EMS8E#TRPBF belongs to ADI's Power Management product line, engineered specifically for portable, battery-operated systems demanding high efficiency, ultra-low quiescent current, and seamless transition between switching and linear regulation.
FAQ
What is the maximum output current capability of the LTC3448EMS8E#TRPBF?
The LTC3448EMS8E#TRPBF delivers up to 600mA in synchronous buck mode under typical conditions (VIN = 3.6V, VOUT = 1.5V). At lower input voltages (e.g., VIN = 2.7V), maximum output current drops to ~400mA due to reduced duty cycle headroom and increased conduction losses. The internal LDO mode supports up to 25mA continuous output, with load regulation specified from 1mA to 10mA.
How does the LTC3448EMS8E#TRPBF automatically switch between buck and LDO modes?
The LTC3448EMS8E#TRPBF switches automatically when the MODE pin is tied to VOUT (auto mode). Below ~3–5mA load current, it disables the buck switches and sources current from the VOUT pin via an internal pass transistor, maintaining <5mVP-P ripple. Above ~8–17mA, it re-enables the buck regulator. This threshold is inversely proportional to inductor value and is validated for 2.2µH inductor per datasheet Figure 2.
What package type and thermal characteristics does the LTC3448EMS8E#TRPBF use?
The LTC3448EMS8E#TRPBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed thermal pad (Pin 9, GND). Its thermal resistance is θJA = 40°C/W when the exposed pad is soldered to a minimum 1-inch² copper area on the PCB. Junction temperature must not exceed 125°C, and overtemperature protection disables operation above this limit until cooldown.
Can the LTC3448EMS8E#TRPBF operate with a 1.5V output using the standard configuration?
Yes - the LTC3448EMS8E#TRPBF is commonly configured for 1.5V output using a resistive divider from VOUT to GND with VFB tied to the midpoint. With its 0.6V reference, a standard 150kΩ (R1) and 100kΩ (R2) divider yields VOUT = 0.6V × (1 + 150k/100k) = 1.5V. The datasheet confirms this as the typical application (Figure TA01a) and specifies load regulation and ripple performance at 1.5V.
What are the absolute maximum ratings for the RUN and MODE pins of the LTC3448EMS8E#TRPBF?
The RUN pin has absolute maximum ratings of –0.3V to (VIN + 0.3V); operation is guaranteed for VRUN < 0.3V (shutdown) or > 1.5V (active). The MODE pin shares the same voltage range (–0.3V to VIN + 0.3V), with defined logic thresholds: VMODEL = 0.12V (low), VMODEH = VIN – 0.15V (high). Exceeding these limits risks latch-up or permanent damage, per Absolute Maximum Ratings table.
LTC3448EMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.5MHz ~ 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3448EMS8E#TRPBF FAQ
1.How can I place an order for LTC3448EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3448EMS8E#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 LTC3448EMS8E#TRPBF reliable?
The price and inventory of LTC3448EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3448EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3448EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3448EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3448EMS8E#TRPBF?
LTC3448EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3448EMS8E#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 LTC3448EMS8E#TRPBF?
For technical support, including LTC3448EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3448EMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3448EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3448EMS8E#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 LTC3448EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3448EMS8E#TRPBF?
All LTC3448EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3448EMS8E#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 LTC3448EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LTC3448EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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