My Inquiry
My Account
Analog Devices Inc. LTC3448EMS8E#PBF
- Part No.:
- LTC3448EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3448EMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,248
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3448EMS8E#PBF 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 achieves up to 96% efficiency while maintaining <5mVP-P ripple in LDO mode - ideal for noise-sensitive portable power rails.
For engineers reviewing the LTC3448EMS8E#PBF datasheet, LTC3448EMS8E#PBF pinout, LTC3448EMS8E#PBF application, or LTC3448EMS8E#PBF equivalent, key selection criteria include its dual-mode operation (PWM + automatic linear regulation), low-quiescent 32µA LDO supply current, 0.6V reference enabling 1.5V fixed-output configuration, thermal-enhanced 8-lead MSOP package, and absence of external Schottky diode requirement.
Technical Context
The LTC3448EMS8E#PBF implements a constant-frequency, current-mode synchronous buck architecture with internal P-channel and N-channel MOSFETs. Its control loop integrates slope compensation to prevent subharmonic oscillation at high duty cycles while preserving peak inductor current capability across all operating conditions.
It features autonomous mode transition: below ~3mA load, it disables the switcher and activates an internal linear regulator (LDO) to suppress output ripple; above ~11mA, it re-engages PWM operation. Mode selection is configurable via the MODE pin (GND = forced switcher, VIN = forced LDO, VOUT = auto).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7–4.2V nominal) with margin for full discharge and charging peaks. |
| Output Current (Buck) | 600mA - sufficient for core logic rails in handheld devices without external boost or parallel stages. |
| Switching Frequency | 1.5MHz or 2.25MHz - enables use of compact 2.2µH inductors and ceramic capacitors under 10µF. |
| LDO Mode Supply Current | 32µA typical - extends battery runtime during standby/sleep states in portable instruments. |
| Feedback Reference Voltage | 0.6V ±1.5% - allows precise 1.5V output using standard 1:1.5 resistor divider (R1=100kΩ, R2=150kΩ). |
| Shutdown Current | <1µA - ensures negligible drain during system-level power-off in cellular telephones and modems. |
| Thermal Package | 8-Lead MSOP with exposed pad - θJA = 40°C/W enables >600mA continuous operation at TA ≤ 60°C without heatsink. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E), 3mm × 3mm footprint, thermally enhanced with exposed GND pad (Pin 9) requiring PCB soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Feedback Input | Connects to resistive divider midpoint; regulates output by comparing against 0.6V internal reference. |
| VOUT (Pin 2) | Power Output / LDO Source | Delivers regulated voltage; supplies up to 25mA in LDO mode; connects to inductor and output capacitor. |
| MODE (Pin 3) | LDO Control Logic | GND = disable LDO, VIN = force LDO, VOUT = auto-switching between buck and LDO based on load threshold. |
| VIN (Pin 4) | Main Power Input | Accepts 2.5–5.5V; requires ≥2.2µF local ceramic decoupling to minimize switching noise injection. |
| SW (Pin 5) | Internal Switch Node | Connects directly to inductor; carries high di/dt square wave; layout critical for EMI and efficiency. |
| FREQ (Pin 6) | Frequency Select | 0V = 1.5MHz, VIN = 2.25MHz - sets oscillator frequency without external components. |
| SYNC (Pin 7) | External Clock Input | Accepts 1.5–4MHz external clock; overrides FREQ pin when active; enables multi-rail synchronization. |
| RUN (Pin 8) | Enable/Shutdown Control | >1.5V = active, <0.3V = shutdown (<1µA IQ); must not float; 50µs delay required after RUN high before MODE assertion. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous N-channel MOSFET eliminates conduction loss and board space for discrete diode. |
| 100% duty cycle low-dropout operation | Maintains regulation down to VIN ≈ VOUT + 0.3V, extending usable battery life in deep-discharge scenarios. |
| Automatic LDO mode at light loads | Switches to linear regulation below 3mA, reducing output ripple to <5mVP-P without external circuitry. |
| Current-mode control with slope compensation | Ensures stable operation across 0–100% duty cycle range, including dropout, without external compensation. |
| Overtemperature protection | Thermal shutdown activates at TJ = 125°C; resumes operation after cooldown - prevents permanent damage during overload. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor I/O and RF transceiver bias rails during intermittent data transmission. IC Role / Device Role / Timing Role: Dual-mode regulator supplying 1.5V core voltage with ultra-low ripple during receive mode and high-efficiency PWM during transmit bursts. Use Value: Eliminates need for separate LDO + buck ICs; reduces BOM count and PCB area while meeting 3GPP spectral mask requirements for conducted emissions. | Use Scenario: Providing clean 1.5V supply to DSL line driver and PHY interface in residential gateways. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated rail to analog front-end; synchronizes switching frequency to avoid interference with ADSL upstream bands. Use Value: SYNC pin enables alignment with system clock, preventing beat frequencies that degrade SNR in xDSL line diagnostics. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Powering image sensor analog supply and ADC reference during burst capture sequences. IC Role / Device Role / Timing Role: Low-noise power source for precision analog blocks; transitions to LDO mode during sensor integration phase to suppress switching artifacts. Use Value: Achieves <5mVP-P ripple in LDO mode - prevents fixed-pattern noise and quantization errors in 12-bit+ image pipelines. | Use Scenario: Supplying microcontroller core and precision op-amp rails in handheld multimeters and environmental sensors. IC Role / Device Role / Timing Role: Single-chip solution for mixed-signal subsystems requiring both high-efficiency conversion and ultra-low-noise standby power. Use Value: 32µA LDO quiescent current enables >1-year battery life in always-on measurement modes without compromising dynamic response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator with LDO mode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | Fixed 1.5V output only; no LDO mode; 2.25MHz only; lower max output (300mA); no SYNC pin. | Suitable for cost-sensitive, low-current digital rails where ripple tolerance >10mVP-P is acceptable. | Select only if LDO mode and >400mA load are unnecessary; verify thermal derating for 300mA continuous in MSOP-6. |
| MAX8640YETA+ | Supports 1.5V/1.8V/2.5V/3.3V outputs; includes power-good flag; no auto-LDO; higher IQ (55µA in PFM mode). | Better for multi-voltage systems needing sequencing; less suitable for ultra-low-noise analog sections. | Prefer when system requires multiple fixed outputs or PG signal; avoid when sub-5mVP-P ripple is mandatory at light loads. |
Compared with LTC3448EMS8E#PBF, TPS62260DRVR lacks LDO mode and current capability, limiting analog performance; MAX8640YETA+ offers more output options but higher quiescent current and no true low-ripple linear fallback - making LTC3448EMS8E#PBF uniquely suited for battery-powered mixed-signal applications demanding both efficiency and noise immunity.
Availability
LTC3448EMS8E#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital still cameras, and portable instruments requiring stable component supply across extended production lifecycles.
Supply support for LTC3448EMS8E#PBF 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.
The LTC3448EMS8E#PBF belongs to Linear's µPower synchronous buck regulator family, engineered specifically for portable, battery-operated systems where efficiency at light loads and ultra-low noise are critical design constraints.
FAQ
What is the maximum output current capability of the LTC3448EMS8E#PBF at 3.6V input and 1.5V output?
The LTC3448EMS8E#PBF delivers up to 600mA continuous output current under these conditions, as confirmed by Figure 4 in the datasheet. At lower input voltages (e.g., 2.7V), maximum output current drops to ~400mA due to reduced headroom and increased conduction losses. Thermal limits in the 8-lead MSOP package require ambient temperature ≤60°C for full 600mA operation without derating.
Does the LTC3448EMS8E#PBF require an external Schottky diode?
No, the LTC3448EMS8E#PBF does not require an external Schottky diode. It integrates both a P-channel high-side and N-channel low-side synchronous MOSFET, eliminating body-diode conduction losses and enabling >95% efficiency at medium loads. This integration reduces component count, PCB area, and thermal stress compared to asynchronous buck topologies.
How does the automatic LDO mode function in the LTC3448EMS8E#PBF?
The LTC3448EMS8E#PBF automatically switches to LDO mode below ~3mA load current when the MODE pin is tied to VOUT. In this mode, the internal buck switches disable and the VOUT pin sources current through a linear pass element, reducing output ripple to <5mVP-P while drawing only 32µA quiescent current. The transition threshold is inversely proportional to inductor value and is guaranteed by design, not production tested.
What is the purpose of the exposed pad (Pin 9) on the LTC3448EMS8E#PBF MSOP package?
The exposed pad (Pin 9) on the LTC3448EMS8E#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA = 40°C/W thermal resistance. Omitting this connection degrades thermal performance by >25°C/W, risking thermal shutdown under sustained 600mA loads and violating Absolute Maximum Ratings for junction temperature.
Can the LTC3448EMS8E#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3448EMS8E#PBF supports external synchronization via the SYNC pin. It accepts input clocks from 1.5MHz to 4MHz, as specified in the Electrical Characteristics table. When an external clock is applied, it overrides the FREQ pin setting. Operation above 2.2MHz requires FREQ pin pulled high, and 4MHz is guaranteed by design but not production tested due to duty-cycle limitations.
LTC3448EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3448EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3448EMS8E#PBF 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#PBF reliable?
The price and inventory of LTC3448EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3448EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3448EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3448EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3448EMS8E#PBF?
LTC3448EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3448EMS8E#PBF 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#PBF?
For technical support, including LTC3448EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3448EMS8E#PBF requirements.
6.How does Aetrix verify that LTC3448EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3448EMS8E#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3448EMS8E#PBF?
All LTC3448EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3448EMS8E#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3448EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3448EMS8E#PBF 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
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…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
