My Inquiry
My Account
Analog Devices Inc. LT1576IS8-5#TRPBF
- Part No.:
- LT1576IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1576IS8-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1576IS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.25A monolithic step-down switching regulator in fused-lead SO-8 package. It features 200kHz constant-frequency current-mode control, 0.2Ω switch on-resistance, 1.21V internal reference, and integrated shutdown with 20µA quiescent current. Designed for battery-powered systems requiring stable 5V rail generation from 6V–25V input.
For engineers reviewing the LT1576IS8-5#TRPBF datasheet, LT1576IS8-5#TRPBF pinout, LT1576IS8-5#TRPBF application, or LT1576IS8-5#TRPBF equivalent, key selection criteria include fixed 5V output accuracy (±2%), thermal performance enabled by fused ground lead, cycle-by-cycle current limiting, and compatibility with standard surface-mount magnetics and capacitors.
Technical Context
The LT1576IS8-5#TRPBF implements current-mode control with an internal 1.21V reference and dedicated SENSE pin (replacing FB) for direct 5V output monitoring. Its 200kHz oscillator enables predictable EMI filtering and supports synchronization up to 400kHz via SYNC pin on variant parts - though LT1576IS8-5#TRPBF uses SHDN on Pin 8 instead.
It employs a saturating NPN power switch driven by a BOOST capacitor to achieve low conduction loss (0.2Ω typical), while slope compensation prevents subharmonic oscillation above 50% duty cycle. The fused SO-8 package reduces θJA to 80°C/W when connected to a ground plane, extending ambient operating range to –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (SENSE pin monitors output directly; no external divider required) |
| Max Output Current | 1.25A continuous at VIN = 10V, L = 33µH; derates to ≤0.94A at VIN = 15V due to peak switch current limit |
| Switching Frequency | 200kHz nominal (180–220kHz over temp); enables compact LC filter design with minimal EMI spread |
| Input Voltage Range | 6V to 25V; minimum start-up voltage is 5.5V (guaranteed regulation at ≥5.0V under load) |
| Switch On Resistance | 0.2Ω typical at ISW = 1.5A; reduces conduction loss and improves efficiency >88% at mid-load |
| Shutdown Current | 20µA max (VSHDN = 0V); enables ultra-low-power sleep mode in portable systems |
| Thermal Resistance | θJA = 80°C/W with fused GND pin connected to PCB ground plane; extends usable ambient range |
Pinout & Package
Fused-lead 8-pin plastic SOIC (SO-8) package with exposed fused ground lead for enhanced thermal dissipation. Pin 4 (GND) is internally bonded to a dedicated low-thermal-resistance path to the package substrate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch emitter | Drives inductor; clamped externally by catch diode; negative swing limited to –0.8V |
| VIN (Pin 2) | Power switch collector & bias source | Supplies internal circuitry; high dI/dt node requiring local bypass capacitor placement |
| BOOST (Pin 3) | Bootstrap drive voltage input | Enables NPN saturation via external capacitor/diode; reduces switch VCE(sat) to ~0.3V |
| GND (Pin 4) | Reference and thermal ground | Fused lead lowers θJA; must be tied directly to ground plane for optimal thermal and load regulation |
| BIAS (Pin 5) | Efficiency-boosting auxiliary supply | Connect to regulated 5V output to reduce total input current by ~10% at high VIN/light load |
| VC (Pin 6) | Error amplifier output / current limit comparator input | Used for loop compensation; also serves as current clamp point during overload foldback |
| SENSE (Pin 7) | Fixed-output voltage monitor | Replaces FB on -5 variants; connects directly to 5V output; triggers foldback if <0.7V |
| SHDN (Pin 8) | Shutdown control | Two-threshold logic: 2.42V UVLO disable, 0.37V micropower shutdown (20µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with SENSE pin | Eliminates external resistor divider; improves accuracy and reduces BOM count |
| Saturating NPN switch with BOOST | 0.2Ω RON enables >88% efficiency without MOSFET-level gate drive complexity |
| Current-mode control with slope compensation | Stable operation up to 90% duty cycle; prevents subharmonic oscillation in continuous conduction mode |
| Fused SO-8 thermal design | θJA = 80°C/W with ground plane - 30% lower than standard SO-8, enabling higher ambient operation |
| Cycle-by-cycle current limiting | 1.5A peak switch current limit (derated above 50% duty cycle) protects IC and external components during overload |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Generating clean 5V rail for USB peripherals and logic in clamshell notebooks with 12V Li-ion packs. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V from variable battery input (8–25V). Use Value: Fixed 5V output eliminates calibration drift; fused SO-8 maintains thermal headroom during CPU burst loads. | Use Scenario: Powering microcontroller subsystems in handheld test equipment powered by 4×AA alkaline cells (6–9V). IC Role / Device Role / Timing Role: Main DC/DC regulator providing stable 5V for MCU, display, and sensors across battery discharge curve. Use Value: 20µA shutdown current extends battery life in standby; 6V min input ensures operation until end-of-life cell voltage. |
| Battery Charger | Distributed Power |
Use Scenario: Supplying 5V bias to charge management IC and status LEDs in multi-cell Li-ion charger modules. IC Role / Device Role / Timing Role: Secondary regulator deriving 5V from intermediate 12V bus generated by primary AC/DC stage. Use Value: 200kHz fixed frequency simplifies EMI filtering; BOOST architecture sustains efficiency even at 25V input transients. | Use Scenario: Local 5V conversion in industrial I/O modules fed from 24V backplane. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24V to 5V for FPGA configuration, communication PHYs, and analog front-ends. Use Value: –40°C to 125°C operating range ensures reliability in uncontrolled enclosures; fused GND supports long-term thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#TRPBF | 4mm × 3mm DFN-12, 3MHz switching, 1.2A output, integrated MOSFETs, 2.5µA quiescent current | Higher frequency enables smaller inductors; lacks BOOST architecture; requires external compensation | Preferred for space-constrained designs where ultra-low IQ and small footprint outweigh need for high-voltage input robustness |
| TPS54202DRCT | 3mm × 3mm WSON-10, 500kHz, 2A output, integrated FETs, 2µA shutdown, adjustable output only | No fixed 5V option; requires external feedback resistors; higher fSW increases switching loss at 25V input | Best suited for new designs targeting cost-sensitive consumer applications with 12V input and adjustable output needs |
Compared with LTC3605EDE-5#TRPBF and TPS54202DRCT, the LT1576IS8-5#TRPBF offers superior thermal robustness at high input voltages (6–25V), fixed 5V simplicity, and proven reliability in industrial temperature ranges - making it ideal for legacy-compatible or ruggedized 5V POL applications where board area is less constrained than thermal margin.
Availability
LT1576IS8-5#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply with guaranteed long-term availability.
Supply support for LT1576IS8-5#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 acquired Linear Technology in 2017 and maintains full support for its legacy power management portfolio. Linear was renowned for high-performance analog and power ICs with rigorous characterization.
The LT1576 family was designed specifically for noise-sensitive, high-reliability buck conversion in portable and industrial systems - emphasizing thermal resilience, fixed-output simplicity, and robust operation across wide input ranges.
FAQ
What is the output voltage tolerance of the LT1576IS8-5#TRPBF?
The LT1576IS8-5#TRPBF provides a fixed 5.0V output with ±2% tolerance over temperature and line conditions. This specification is guaranteed by internal trimming of the SENSE pin threshold (4.94V to 5.06V) and applies across the full –40°C to 125°C junction temperature range and 6V–25V input voltage range.
Does the LT1576IS8-5#TRPBF require an external BOOST capacitor?
Yes, the LT1576IS8-5#TRPBF requires an external BOOST capacitor (typically 100pF) connected between BOOST and VIN pins. This capacitor enables the internal NPN switch to saturate, reducing conduction loss and achieving the specified 0.2Ω on-resistance and >88% efficiency.
Can the LT1576IS8-5#TRPBF operate with input voltage below 6V?
No - the absolute minimum input voltage for guaranteed regulation is 5.5V, and the recommended minimum operating input is 6V. Below this, internal bias lines may not regulate properly, causing reference voltage drift and potential loss of regulation. The LT1576IS8-5#TRPBF is not rated for 5V input operation.
How does the SENSE pin function differ from the FB pin on adjustable variants?
On the LT1576IS8-5#TRPBF, Pin 7 is SENSE - not FB - and connects directly to the 5V output. It replaces the external resistor divider used on adjustable versions. When SENSE drops below 0.7V, the device initiates frequency and current foldback to protect against short-circuit conditions, a behavior not present on FB-based variants.
What is the maximum allowable inductor value for the LT1576IS8-5#TRPBF?
The LT1576IS8-5#TRPBF supports inductors up to 60µH for improved load current capability and reduced ripple. At 60µH, maximum output current increases to ~1.25A at VIN = 10V, but physical size and core loss must be balanced - data sheet graphs confirm diminishing returns beyond 60µH for typical 5V applications.
LT1576IS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1576IS8-5#TRPBF FAQ
1.How can I place an order for LT1576IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1576IS8-5#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 LT1576IS8-5#TRPBF reliable?
The price and inventory of LT1576IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1576IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1576IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1576IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1576IS8-5#TRPBF?
LT1576IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1576IS8-5#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 LT1576IS8-5#TRPBF?
For technical support, including LT1576IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1576IS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1576IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1576IS8-5#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 LT1576IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1576IS8-5#TRPBF?
All LT1576IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1576IS8-5#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 LT1576IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1576IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1576IS8-5#TRPBF 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…
