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Analog Devices Inc. LT1308BIS8#PBF
- Part No.:
- LT1308BIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308BIS8#PBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:385
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Product details
Overview
LT1308BIS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz boost DC/DC converter optimized for single-cell battery operation (1V–10V input), delivering up to 34V output with 2A switch current capability and 300mV VCE(SAT) at 2A. It features continuous switching at light loads, 2.5mA quiescent current, and an integrated low-battery detector with ±2% 200mV reference - used in 5V/1A Li-ion power supplies for digital cameras and handheld computers.
For engineers reviewing the LT1308BIS8#PBF datasheet, LT1308BIS8#PBF pinout, LT1308BIS8#PBF application, or LT1308BIS8#PBF equivalent, key selection criteria include its –40°C to +85°C industrial temperature rating, SO-8 package compatibility, 600kHz switching frequency, continuous-mode operation (vs. Burst Mode in LT1308A), and verified 34V max output capability in boost topology.
Technical Context
The LT1308BIS8#PBF implements a current-mode PWM architecture with a 600kHz oscillator and ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier uses external VC-pin compensation (RC network) for loop stability, and the internal 0.03Ω driver supports 2A peak switch current with 300mV saturation voltage at 25°C.
Unlike the LT1308A, the LT1308B omits hysteresis in the enable comparator, ensuring uninterrupted 600kHz switching down to light loads (<100mA), eliminating low-frequency output ripple but trading off light-load efficiency. The low-battery detector uses a precision 200mV reference with ±2% accuracy over temperature and drives an open-collector LBO output sinking 50μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz (fixed, ±100kHz tolerance); enables compact magnetics and EMI filtering with predictable spectral content. |
| Input Voltage Range | 1V to 10V; supports direct operation from single Li-ion (2.7–4.2V), NiCd/NiMH (1.2V/cell), or alkaline cells without pre-regulation. |
| Max Output Voltage | 34V; determined by 36V-rated SW pin voltage limit, enabling high-voltage bias rails for LCDs or RF modules. |
| Quiescent Current | 2.5mA (switching mode); ensures stable regulation under moderate loads without Burst Mode interruption. |
| Feedback Reference | 1.22V (±0.03V over temp); sets output via resistor divider (VOUT = 1.22V × (1 + R1/R2)), supporting precise 3.3V, 5V, or 12V outputs. |
| Low-Battery Threshold | 200mV ±2% (–40°C to +85°C); provides accurate battery monitoring with minimal external components (LBI/LBO pins). |
| Shutdown Current | ≤1μA; guarantees ultra-low leakage during system sleep, critical for long-term battery runtime in portable devices. |
Pinout & Package
LT1308BIS8#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal performance (θJA = 190°C/W). All pins are surface-mount compatible and require standard reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC) | Compensation node | Output of internal error amplifier; connects to RC network (e.g., 47kΩ + 100pF) for loop stability and transient response tuning. |
| 2 (FB) | Feedback input | Senses regulated output via resistive divider; 1.22V reference enables accurate output programming across temperature. |
| 3 (SHDN) | Enable control | Active-high logic input; ≥1V enables operation (no VIN tie required), <0.8V disables with ≤1μA shutdown current. |
| 4 (GND) | Power ground | Main return path for switch current and IC bias; must connect directly to low-impedance ground plane to minimize noise and thermal rise. |
| 5 (SW) | Power switch node | Drives external inductor/diode; rated for –0.4V to 36V; requires minimized trace area to reduce EMI and ringing. |
| 6 (VIN) | Input supply | Accepts 1V–10V input; requires local 47μF tantalum bypass capacitor placed within 5mm of pin for stable start-up into heavy loads. |
| 7 (LBI) | Low-battery detector input | High-impedance analog input referenced to 200mV; voltage below 196–204mV triggers LBO assertion. |
| 8 (LBO) | Low-battery output | Open-collector NPN output sinking 50μA; requires external pull-up (e.g., 220kΩ) to interface with microcontroller interrupt or reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous 600kHz switching | Eliminates low-frequency output ripple at light loads - essential for noise-sensitive analog circuits and display bias supplies. |
| 36V-rated switch node | Supports >30V output applications (e.g., LCD VGH/VGL) without external clamp diodes or voltage derating. |
| 2.5mA quiescent current (switching) | Enables stable regulation under standby loads (e.g., real-time clocks, sensors) without Burst Mode artifacts or efficiency penalties. |
| ±2% low-battery reference | Reduces component count and calibration effort in battery-powered systems requiring accurate end-of-life detection. |
| Start-up into heavy loads | Charges output capacitor from 1V input while delivering >3A peak inductor current - avoids bootstrapping limitations of CMOS converters. |
Applications
| Digital Camera Power Supply | LCD Bias Generation |
|---|---|
Use Scenario: Powers CCD/CMOS image sensor and flash LED drivers from a single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Boost converter generating regulated 5V/1A and 12V/100mA rails with fast transient response to burst-mode imaging loads. Use Value: Delivers 90%+ efficiency at 500mA load (VIN=3.6V), maintains regulation during flash discharge, and eliminates audible coil whine via fixed 600kHz frequency. |
Use Scenario: Generates positive (VGH) and negative (VGL) bias voltages for TFT-LCD panels in handheld computers. IC Role / Device Role / Timing Role: Primary boost stage producing 24V rail, followed by charge-pump or inverting converter for dual-rail generation. Use Value: 34V max output supports modern high-resolution LCDs; 300mV VCE(SAT) minimizes conduction loss and thermal stress on SO-8 package. |
| GPS Receiver Power Management | Handheld Computer System Rail |
Use Scenario: Supplies clean 3.3V rail to GPS baseband processor and RF front-end from two-series NiMH cells (2.4–3.0V). IC Role / Device Role / Timing Role: Primary DC/DC regulator with tight line/load regulation and low-noise output for sensitive GNSS signal acquisition. Use Value: 1.22V feedback reference ensures ±1% output accuracy; 2.5mA IQ allows always-on tracking mode without excessive battery drain. |
Use Scenario: Provides main 5V system rail for ARM-based handheld computers operating across wide battery voltage range (1.8–4.2V). IC Role / Device Role / Timing Role: High-current boost controller managing dynamic load steps (e.g., Wi-Fi transmit bursts) with minimal output droop. Use Value: 2A switch current limit and 82–90% duty cycle support >1A sustained output; SO-8 thermal design enables operation at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1308AIS8#PBF | Burst Mode™ operation at light loads (140μA IQ), ±2% 200mV LBI threshold, same pinout and SO-8 package. | Superior light-load efficiency but introduces ~100Hz output ripple; unsuitable for noise-critical analog rails. | Select LT1308AIS8#PBF when battery life at standby dominates over output noise requirements. |
| LT3467EFE#PBF | Higher 1.3MHz switching frequency, integrated 2A switch, 2.5V–16V input, no LBI/LBO pins, thermally enhanced TSSOP-16 package. | Requires smaller inductors/capacitors but lacks battery monitoring; better suited for space-constrained designs without low-battery detection. | Choose LT3467EFE#PBF for compact, high-frequency designs where board area is constrained and LBI functionality is unnecessary. |
Compared with LT1308AIS8#PBF, the LT1308BIS8#PBF trades light-load efficiency for ripple-free output; versus LT3467EFE#PBF, it retains integrated battery monitoring and lower EMI at the cost of larger passives and SO-8 thermal limits.
Availability
LT1308BIS8#PBF is available at Aetrix Electronics and suitable for digital camera power supplies, LCD bias generation, GPS receiver power management, and handheld computer system rails requiring stable component supply across industrial temperature ranges.
Supply support for LT1308BIS8#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LT1308BIS8#PBF belongs to Linear's legacy micropower DC/DC converter product line, designed specifically for battery-powered portable electronics demanding high efficiency, small solution size, and robust start-up behavior from weak input sources.
FAQ
What is the maximum output voltage achievable with the LT1308BIS8#PBF?
The LT1308BIS8#PBF supports up to 34V output voltage, limited by its 36V absolute maximum SW pin rating. This is achieved using standard boost topology with appropriate external components - inductor, Schottky diode, and output capacitor - and validated in typical applications like LCD bias supplies. Exceeding 34V risks violating the SO-8 package's voltage isolation and may compromise reliability.
Does the LT1308BIS8#PBF support Burst Mode operation?
No, the LT1308BIS8#PBF does not support Burst Mode operation. It operates continuously at 600kHz across all load conditions, unlike the LT1308AIS8#PBF which switches to micropower Burst Mode at light loads. This design choice eliminates low-frequency output ripple but results in higher quiescent current (2.5mA vs. 140μA) under no-load conditions.
What is the operating temperature range for the LT1308BIS8#PBF?
The LT1308BIS8#PBF is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by its "I" grade marking (1308BI) and qualification testing per Linear Technology's industrial specifications. The SO-8 package's thermal resistance (θJA = 190°C/W) requires proper PCB copper area and grounding to maintain junction temperature within limits at full load.
How is the low-battery detection function implemented on the LT1308BIS8#PBF?
The LT1308BIS8#PBF implements low-battery detection via dedicated LBI and LBO pins: LBI accepts a scaled battery voltage (e.g., via resistor divider), and when it falls below the internal 200mV ±2% reference, LBO pulls low (open-collector, 50μA sink capability). The function is disabled when SHDN is grounded, and LBI must remain between –0.1V and 1V for valid operation.
Can the LT1308BIS8#PBF start up into a precharged output capacitor?
Yes, the LT1308BIS8#PBF can start up into a precharged output capacitor - a key advantage over bootstrapped converters. Its internal circuitry derives bias from VIN, not VOUT, enabling reliable start-up even when the output is held at 5V while VIN ramps from 1V. This behavior is verified in Figure 13 of the datasheet with 1.5V input and 20Ω load.
LT1308BIS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LT1308BIS8#PBF FAQ
1.How can I place an order for LT1308BIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308BIS8#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 LT1308BIS8#PBF reliable?
The price and inventory of LT1308BIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308BIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1308BIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308BIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308BIS8#PBF?
LT1308BIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308BIS8#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 LT1308BIS8#PBF?
For technical support, including LT1308BIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308BIS8#PBF requirements.
6.How does Aetrix verify that LT1308BIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1308BIS8#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 LT1308BIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1308BIS8#PBF?
All LT1308BIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308BIS8#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 LT1308BIS8#PBF part is unused and in its original packaging.
Return procedure for LT1308BIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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