My Inquiry
My Account
Analog Devices Inc. LT1308AIS8#TRPBF
- Part No.:
- LT1308AIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308AIS8#TRPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1308AIS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz boost DC/DC converter optimized for single-cell Li-ion and multi-cell NiCd/NiMH battery systems. It delivers up to 1A at 5V from 1V–10V input, features 140μA no-load quiescent current, 1.22V feedback reference with ±2% accuracy over temperature, and integrated low-battery detector with 200mV threshold. It enables compact, high-efficiency power conversion in space-constrained portable electronics.
For engineers reviewing the LT1308AIS8#TRPBF datasheet, LT1308AIS8#TRPBF pinout, LT1308AIS8#TRPBF application, or LT1308AIS8#TRPBF equivalent, key selection criteria include burst-mode efficiency at light loads, 36V switch rating for high-VOUT designs, SO-8 package thermal performance, and compatibility with ceramic output capacitors via external VC compensation.
Technical Context
The LT1308AIS8#TRPBF implements current-mode PWM control with automatic transition to Burst Mode™ operation below ~400mA load, reducing average input current while maintaining regulation. Its internal 600kHz oscillator drives a 300mV VCE(SAT) NPN switch rated to 36V, enabling output voltages up to 34V. The error amplifier features 100V/V gain and 60μmhos transconductance, compensated externally via the VC pin using a series RC network.
It integrates a precision low-battery detector with ±2% 200mV reference and open-collector LBO output capable of sinking 50μA. Shutdown functionality requires only ≥1V on SHDN (independent of VIN), drawing <1μA in shutdown. The device starts into heavy loads without bootstrapping, supporting robust 3.5A peak inductor current during startup from 1.5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz fixed - enables compact magnetics and reduces EMI filtering requirements. |
| Input Voltage Range | 1V to 10V - supports single Li-ion (2.7–4.2V), two/three NiCd (1.2V/cell), or alkaline stacks. |
| Feedback Reference | 1.22V ±2% over –40°C to +85°C - ensures stable output regulation across industrial temperature range. |
| No-Load Quiescent Current | 140μA - minimizes battery drain in standby, critical for long-life portable devices. |
| Switch VCE(SAT) | 290mV at 2A, 25°C - reduces conduction loss and improves efficiency at high load currents. |
| Low-Battery Threshold | 200mV ±2% - provides accurate battery monitoring with minimal external components. |
| Shutdown Current | ≤1μA - enables true zero-power off-state for system-level power gating. |
Pinout & Package
LT1308AIS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with θJA = 190°C/W, rated for –40°C to +85°C operation. Pin 4 serves as the primary ground connection, with PCB copper acting as a heat sink.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| LBO | Low-battery detector open-collector output | Sinks 50μA when LBI < 200mV; requires external pull-up for logic-level signaling to host processor. |
| LBI | Low-battery detector input | Compares battery voltage divider against internal 200mV reference; bias current flows out (33nA typical). |
| VIN | Main power input | Accepts 1V–10V; requires local 47μF bypass capacitor placed ≤5mm from pin to minimize switching noise. |
| SW | Internal NPN switch collector | Connects to inductor/diode node; high dI/dt path requiring minimized trace area and direct routing. |
| VC | Error amplifier compensation output | External RC network (e.g., 47kΩ + 100pF) sets loop stability; sinking current forces micropower mode. |
| FB | Feedback input | 1.22V reference point; connects to resistor divider (R1/R2) to set VOUT = 1.22V × (1 + R1/R2). |
| SHDN | Enable/disable control | Active-high; ≥1V enables converter (no VIN tie required); floating or grounded disables with <1μA current. |
| GND | Power and signal ground | Primary return path; must connect directly to local ground plane with multiple vias for thermal and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~400mA load, reducing average IQ to 140μA while maintaining output regulation and minimizing low-frequency ripple. |
| 36V switch rating | Enables boost outputs up to 34V, supporting LCD bias, white LED drivers, and higher-voltage peripherals from low-input sources. |
| Integrated low-battery detector | ±2% 200mV reference with 50μA sink capability eliminates need for external comparator and reference ICs. |
| Start-up into heavy loads | Delivers 3.5A peak inductor current from 1.5V input, avoiding bootstrapping limitations and ensuring reliable cold-start behavior. |
| External VC compensation | Allows full loop stability optimization with ceramic or tantalum output capacitors, accommodating diverse ESR requirements. |
Applications
| Digital Cameras | GSM/CDMA Phones |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and flash LEDs from a single Li-ion cell. IC Role / Device Role / Timing Role: Primary boost regulator generating 3.3V/5V rails and 12V–24V for flash discharge. Use Value: Burst Mode™ extends battery life during preview/idle states; 36V switch rating supports high-voltage flash capacitor charging. | Use Scenario: Supplying RF power amplifier bias and baseband core voltage in dual-mode cellular handsets. IC Role / Device Role / Timing Role: System power manager delivering regulated 2.8V/3.3V/5V from declining battery voltage. Use Value: 1V minimum input enables operation down to nearly depleted cells; low-battery detector triggers graceful shutdown before brownout. |
| LCD Bias Supplies | Battery Backup Supplies |
Use Scenario: Generating positive and negative bias voltages (e.g., +15V, –10V) for TFT-LCD panels in handheld computers. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter in SEPIC or inverting configurations. Use Value: Fixed 600kHz frequency simplifies EMI filter design; 140μA quiescent current preserves backup battery capacity during extended sleep. | Use Scenario: Maintaining real-time clock (RTC) and SRAM retention during main power failure in industrial controllers. IC Role / Device Role / Timing Role: Low-quiescent-current boost converter sustaining 3.3V rail from coin-cell or supercapacitor. Use Value: <1μA shutdown current prevents backup source depletion; wide 1V–10V input accommodates varying backup source voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525EDD-5#TRMPBF | 5V fixed-output, 1.2MHz switching, 200μA IQ, 2A switch, 20V max VSW | Fixed 5V output only; no adjustable FB or LBO; smaller 10-lead DFN package | Select when fixed 5V output suffices and board space is constrained; not suitable for >5V or battery-monitoring applications. |
| TPS61040DRVR | 28V max VSW, 0.4A switch current limit, 5.5V max VIN, 2.5MHz switching, 25μA IQ | Lower max input/output voltage; lower current capability; no integrated low-battery detector | Choose for ultra-low-IQ applications with <5.5V input and ≤0.4A load; requires external battery monitor if LBO function needed. |
Compared with LTC3525EDD-5#TRMPBF and TPS61040DRVR, the LT1308AIS8#TRPBF offers wider input range (1V–10V), higher switch voltage (36V), integrated low-battery detection, and adjustable output-making it uniquely suited for industrial portable equipment requiring flexible, robust, and feature-rich boost conversion.
Availability
LT1308AIS8#TRPBF is available at Aetrix Electronics and suitable for digital cameras, GSM/CDMA phones, and LCD bias supplies requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and guaranteed parametric performance across full operating range.
Supply support for LT1308AIS8#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 its legacy of high-performance analog and power management ICs for demanding applications.
The LT1308AIS8#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable electronics where efficiency at light loads, small solution size, and system-level monitoring (e.g., battery health) are critical.
FAQ
What is the minimum input voltage required for LT1308AIS8#TRPBF to start and regulate?
The LT1308AIS8#TRPBF has a specified minimum input voltage of 0.92V and can start up and regulate from as low as 1V input. It successfully delivers regulated 5V output even when starting from a 1.5V source into a 20Ω load, demonstrating robust under-voltage operation essential for deeply discharged battery systems.
Does LT1308AIS8#TRPBF support ceramic output capacitors?
Yes, the LT1308AIS8#TRPBF supports ceramic output capacitors via its external VC compensation pin. Unlike regulators relying on ESR for stability, the LT1308AIS8#TRPBF allows full loop tuning with RC networks (e.g., 47kΩ + 100pF), enabling stable operation with near-zero-ESR ceramics while retaining compatibility with tantalum solutions.
How does the low-battery detector on LT1308AIS8#TRPBF differ from the original LT1308?
The LT1308AIS8#TRPBF features a significantly improved low-battery detector with ±2% accuracy on its 200mV reference (vs. looser tolerance on LT1308) and enhanced drive strength-LBO can sink 50μA versus lower capability in the predecessor. This enables direct interfacing with microcontroller GPIOs without additional buffering.
Can LT1308AIS8#TRPBF be used in SEPIC topology?
Yes, the LT1308AIS8#TRPBF is explicitly validated for SEPIC operation, as shown in Figure 8 of its datasheet. It regulates output over an input range spanning the output voltage (e.g., 3V–10V input to 5V output), making it suitable for applications where input may fall below or rise above the desired output, such as multi-cell battery systems with variable state-of-charge.
What thermal considerations apply to LT1308AIS8#TRPBF in SO-8 package?
The LT1308AIS8#TRPBF in SO-8 has θJA = 190°C/W. Effective thermal design requires connecting Pin 4 (GND) to a large local ground plane acting as a heat sink, using multiple vias to inner-layer ground, and minimizing trace length for high-current paths (VIN, SW, GND). Layout per Figure 6 is mandatory to achieve rated performance and avoid thermal shutdown.
LT1308AIS8#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-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1308AIS8#TRPBF FAQ
1.How can I place an order for LT1308AIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308AIS8#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 LT1308AIS8#TRPBF reliable?
The price and inventory of LT1308AIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308AIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1308AIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308AIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308AIS8#TRPBF?
LT1308AIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308AIS8#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 LT1308AIS8#TRPBF?
For technical support, including LT1308AIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308AIS8#TRPBF requirements.
6.How does Aetrix verify that LT1308AIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1308AIS8#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 LT1308AIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1308AIS8#TRPBF?
All LT1308AIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308AIS8#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 LT1308AIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1308AIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1308AIS8#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…
