My Inquiry
My Account
Analog Devices Inc. LT1767EMS8E#PBF
- Part No.:
- LT1767EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1767EMS8E#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:278
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1767EMS8E#PBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz, 1.5A step-down switching regulator in an exposed-pad MSOP-8 package. It integrates a 0.22Ω NPN power switch, current-mode control loop, and 1.2V feedback reference, delivering fixed 3.3V output with ±2% tolerance across 3V–25V input. Used in battery-powered systems and wall adapters requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1767EMS8E#PBF datasheet, LT1767EMS8E#PBF pinout, LT1767EMS8E#PBF application, or LT1767EMS8E#PBF equivalent, key selection factors include its constant-frequency current-mode architecture, thermal performance enabled by the exposed GND pad (θJA = 40°C/W), synchronization capability up to 2MHz, and validated operation from –40°C to 125°C junction temperature.
Technical Context
The LT1767EMS8E#PBF implements a fixed-frequency (1.25MHz nominal), current-mode buck topology with cycle-by-cycle peak current limiting and internal slope compensation. Its BOOST pin drives the NPN switch emitter with a voltage ~VOUT above VIN, enabling saturation and minimizing conduction loss (typ. 330mV at –1.5A).
Control is executed via an error amplifier (gm = 850µMho) whose output (VC pin) sets the per-cycle current trip threshold. The SHDN pin provides 1.33V UVLO with 7µA hysteresis, while SYNC accepts logic-level signals up to 2MHz for external clock synchronization without duty-cycle restriction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (LT1767EMS8E-3.3 variant; FB internally connected to VOUT) |
| Switch Current Limit | 1.5A constant maximum over all duty cycles - enables predictable thermal design and avoids foldback at light loads |
| Switching Frequency | 1.25MHz (±15%) - permits use of small chip inductors (e.g., 2.2–4.7µH) and low-ESR ceramic output capacitors |
| Input Voltage Range | 3V to 25V - supports wide-range industrial inputs and single-cell Li-ion to 24V bus systems |
| Feedback Reference | 1.2V ±1.5% - sets output accuracy; fixed-output versions embed divider, eliminating external resistors |
| Thermal Resistance | θJA = 40°C/W (MS8E exposed-pad package) - enables 1.5A continuous operation with minimal PCB copper area |
| Shutdown Current | 6µA max - preserves battery life in portable systems during standby |
Pinout & Package
LT1767EMS8E#PBF uses an 8-lead plastic MSOP package with exposed GND pad (MS8E), optimized for thermal dissipation (θJA = 40°C/W). The exposed pad must be soldered to a large PCB copper area and electrically connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; requires external 0.1µF capacitor and Schottky diode (e.g., CMDSH-3) |
| 2: VIN | Power switch collector & IC supply input | Connects to input source; bypass with ceramic capacitor close to pin to suppress dI/dt-induced spikes |
| 3: SW | Power switch emitter | Drives inductor; swings negative during off-time - requires external catch diode (e.g., UPS120) clamped to GND |
| 4: GND | Power and signal reference | Exposed pad is GND; must be soldered to large copper plane for thermal and ground integrity |
| 5: SYNC | External clock synchronization input | Logic-compatible (20–80% duty); extends frequency range to 2MHz - reduces EMI and allows phase alignment |
| 6: VC | Error amplifier output / current limit control | 0.35V–0.9V range reflects load; used for compensation, current clamp, or forced shutdown when pulled to GND |
| 7: FB | Feedback input (internally tied to VOUT for fixed 3.3V) | No external divider needed; internal 1.2V reference ensures ±2% output tolerance over line/load/temperature |
| 8: SHDN | Enable/disable control with UVLO | 1.33V threshold; 7µA hysteresis enables precise undervoltage lockout - floats or pulled high for operation |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency 1.5A switch | 0.22Ω on-resistance enables >90% efficiency at 1.2A (12V→3.3V), reducing thermal stress in space-constrained designs |
| Constant-frequency current-mode control | Eliminates subharmonic oscillation above 50% duty cycle without slope compensation - simplifies loop stability and improves transient response |
| Exposed-pad MSOP-8 (MS8E) | 40°C/W θJA enables full 1.5A output without heatsink - 30% lower thermal resistance than standard MSOP-8 (θJA = 110°C/W) |
| Synchronization to 2MHz | Allows EMI reduction via spread-spectrum clocking or multi-phase coordination - no duty-cycle penalty or frequency drift |
| Low shutdown current | 6µA max quiescent draw extends battery runtime in always-on portable devices - verified across –40°C to 125°C |
Applications
| DSL Modems | Portable Computers |
|---|---|
Use Scenario: Powering FPGA I/O banks and PHY interfaces from 12V or 19V adapter rails in compact DSL gateway hardware. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator delivering up to 1.2A with fast transient response to handle burst data traffic. Use Value: High-frequency operation (1.25MHz) minimizes filter component size; exposed-pad thermal design sustains full load in sealed enclosures. |
Use Scenario: Generating 3.3V system rail from Li-ion battery (3.0–4.2V) or USB-C PD input in ultrabook subsystems. IC Role / Device Role / Timing Role: Efficient buck converter supporting dynamic voltage scaling and deep-sleep modes via SHDN control. Use Value: 6µA shutdown current preserves battery charge; wide 3V–25V input accommodates both battery and adapter sources without re-design. |
| Wall Adapters | Battery-Powered Systems |
Use Scenario: Secondary regulation stage in universal AC/DC adapters delivering regulated 3.3V for USB peripherals and IoT modules. IC Role / Device Role / Timing Role: Fixed-output DC/DC stage converting unregulated 5–24V intermediate bus to clean 3.3V with tight tolerance. Use Value: ±2% output tolerance meets USB specification; SYNC pin allows noise-sensitive applications to shift switching frequency away from critical bands. |
Use Scenario: Power management in handheld test equipment requiring stable 3.3V for microcontroller, ADC, and RF front-end from 2-cell alkaline or LiFePO4 packs. IC Role / Device Role / Timing Role: Main system regulator operating down to 3V input - maintains regulation as batteries discharge. Use Value: Undervoltage lockout (2.6V min) prevents brownout crashes; BOOST architecture sustains efficiency even at low VIN/VOUT ratios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1767EMS8-3.3#PBF | Same die, standard MSOP-8 (no exposed pad); θJA = 110°C/W vs. 40°C/W | Lower thermal performance limits continuous current to ~0.8A without aggressive PCB cooling | Select only if board layout cannot accommodate exposed-pad soldering or thermal vias. |
| LT3502AEDD-3.3#PBF | Higher 3MHz switching frequency; 2A switch; different pinout and compensation scheme | Enables smaller magnetics but requires redesign of feedback network and layout due to higher dI/dt | Choose for ultra-compact designs where size outweighs layout effort; not drop-in compatible. |
Compared with LT1767EMS8-3.3#PBF, the LT1767EMS8E#PBF delivers 2.75× better thermal resistance for identical silicon - enabling full 1.5A output in constrained spaces. Versus LT3502AEDD-3.3#PBF, it offers proven 1.25MHz stability with simpler compensation but requires larger inductors.
Availability
LT1767EMS8E#PBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and wall adapters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1767EMS8E#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 acquired Linear Technology in 2017 and maintains full technical support, manufacturing continuity, and qualification for all LT® products including the LT1767 family.
The LT1767 product line was designed for high-efficiency, space-constrained DC/DC conversion in portable, industrial, and communications equipment - emphasizing thermal robustness, wide input range, and fixed-output simplicity.
FAQ
What is the maximum continuous output current of the LT1767EMS8E#PBF at 125°C ambient?
The LT1767EMS8E#PBF delivers 1.5A maximum switch current, but continuous output current at 125°C ambient depends on PCB thermal design. With the exposed pad soldered to ≥2 cm² of 2-oz copper and 4 thermal vias, the device sustains 1.2A continuously at 125°C ambient (per thermal derating curves in the datasheet). At lower ambient temperatures or with enhanced copper, full 1.5A is achievable. The LT1767EMS8E#PBF's 40°C/W θJA enables this performance without heatsinks.
Can the LT1767EMS8E#PBF operate from a 3.0V input to deliver 3.3V output?
No - the LT1767EMS8E#PBF is a buck (step-down) regulator and cannot boost voltage. Its minimum input is 3.0V, but output is always less than input minus diode and switch drops. For 3.3V output, VIN must be ≥3.8V (accounting for ~0.4V diode drop and ~0.3V switch drop). The LT1767EMS8E#PBF is specified for 3V–25V input, but practical minimum for 3.3V output is ~3.8V. Attempting 3.0V input will result in dropout and regulation loss.
What external components are mandatory for basic operation of the LT1767EMS8E#PBF?
Four components are mandatory: (1) Input ceramic capacitor (≥10µF, X5R/X7R) placed near VIN/GND pins; (2) Output ceramic capacitor (≥2.2µF, X5R/X7R) at VOUT/GND; (3) Catch diode (e.g., UPS120 Schottky) between SW and GND; (4) Boost capacitor (0.1µF ceramic) between BOOST and SW. The LT1767EMS8E#PBF integrates the feedback divider for 3.3V output, so no external resistors are required - unlike adjustable versions.
How does the BOOST pin function in the LT1767EMS8E#PBF, and what happens if it's left unconnected?
The BOOST pin supplies a voltage ~VOUT above VIN to fully saturate the internal NPN switch, reducing on-resistance to 0.22Ω. It requires a 0.1µF capacitor and Schottky diode (anode to VOUT) to generate this boosted drive. If left unconnected, the switch operates in linear mode with ~1.5V VCE, causing severe efficiency loss (>50% drop), thermal runaway, and potential failure. The LT1767EMS8E#PBF will not function reliably without proper BOOST circuitry.
Is the LT1767EMS8E#PBF pin-compatible with other variants like LT1767EMS8E-5#PBF?
Yes - all LT1767EMS8E-x#PBF variants (1.8V, 2.5V, 3.3V, 5V) share identical MS8E package, pinout, and electrical interface. Only the internal feedback divider differs; FB is internally connected to VOUT for the fixed-output versions. This allows direct substitution in layouts designed for any LT1767EMS8E-x#PBF, provided the output voltage requirement matches the selected variant. The LT1767EMS8E#PBF itself is the adjustable version and requires external resistors.
LT1767EMS8E#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, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 22.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT1767EMS8E#PBF FAQ
1.How can I place an order for LT1767EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1767EMS8E#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 LT1767EMS8E#PBF reliable?
The price and inventory of LT1767EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1767EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT1767EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1767EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1767EMS8E#PBF?
LT1767EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1767EMS8E#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 LT1767EMS8E#PBF?
For technical support, including LT1767EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1767EMS8E#PBF requirements.
6.How does Aetrix verify that LT1767EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT1767EMS8E#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 LT1767EMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT1767EMS8E#PBF?
All LT1767EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1767EMS8E#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 LT1767EMS8E#PBF part is unused and in its original packaging.
Return procedure for LT1767EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1767EMS8E#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…
