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Analog Devices Inc. LT1308BIS8#TRPBF
- Part No.:
- LT1308BIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308BIS8#TRPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,044
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Product details
Overview
LT1308BIS8#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 inputs. It delivers up to 1A at 5V from 1.5V input, features continuous switching at light loads, 2.5mA quiescent current, 36V switch rating, and integrated low-battery detection with ±2% 200mV reference - used in digital cameras and handheld computers.
For engineers reviewing the LT1308BIS8#TRPBF datasheet, LT1308BIS8#TRPBF pinout, LT1308BIS8#TRPBF application, or LT1308BIS8#TRPBF equivalent, key selection criteria include its 600kHz switching frequency, 2.5mA light-load IQ, 36V switch voltage rating, SO-8 industrial-grade packaging (–40°C to +85°C), and absence of Burst Mode ripple - critical for noise-sensitive analog supply rails.
Technical Context
The LT1308BIS8#TRPBF implements a current-mode PWM architecture with fixed 600kHz oscillator and internal ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier drives the VC pin for external RC compensation, enabling stable operation with ceramic or tantalum output capacitors.
Unlike the LT1308A, the LT1308B omits hysteresis in the enable comparator, ensuring continuous switching down to ~100mA inductor current - eliminating low-frequency output ripple but increasing light-load quiescent current to 2.5mA versus 140μA in Burst Mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz typical; enables compact magnetics and filtering while maintaining high efficiency across 1V–10V input range. |
| Input Voltage Range | 1V to 10V; supports direct operation from single Li-ion (2.7–4.2V), two/three alkaline (1.5–4.5V), or four NiCd cells (4.8–6.0V). |
| Output Voltage Range | Up to 34V; set via external resistor divider on FB pin (1.22V reference); enables 5V, 12V, or 15V bias supplies. |
| Switch Current Limit | 2A minimum (typ. 3A); sustains 1A output at 5V from 1.5V input with margin for start-up surges and transient loads. |
| Quiescent Current | 2.5mA during continuous switching; ensures predictable light-load behavior without Burst Mode voltage ripple. |
| Shutdown Current | ≤1μA; enables true system-level power gating for battery longevity in standby modes. |
| Low-Battery Reference | 200mV ±2% over –40°C to +85°C; provides accurate, temperature-stable trip point for LBI/LBO monitoring circuitry. |
Pinout & Package
LT1308BIS8#TRPBF is housed in an 8-lead plastic SOIC package (SO-8), rated for industrial temperature range (–40°C to +85°C), with θJA = 190°C/W. Pin 4 is GND; pins 1–3 and 5–8 are functionally assigned as listed below.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC) | Compensation node for error amplifier | Connects external RC network (e.g., 47kΩ + 100pF) to set loop stability; sensitive to noise - minimize trace area. |
| 2 (FB) | Feedback input | Monitors divided output voltage against 1.22V internal reference; sets regulated VOUT = 1.22V × (1 + R1/R2). |
| 3 (SHDN) | Enable/disable control | Active-high logic input; ≥1V enables converter; floating or grounded disables it; no tie to VIN required. |
| 4 (GND) | Power and signal ground | Primary ground return path; must connect directly to local ground plane; serves as thermal sink. |
| 5 (SW) | Internal power switch drain | Connects to inductor/diode node; carries high di/dt switching current; minimize trace inductance and area. |
| 6 (VIN) | Main power input | Accepts 1V–10V input; requires local 47μF bypass capacitor placed ≤5mm from pin. |
| 7 (LBI) | Low-battery detector input | High-impedance input referenced to 200mV; voltage <196mV triggers LBO; bias current flows out (33nA typ). |
| 8 (LBO) | Low-battery open-collector output | Sinks up to 50μA; requires external pull-up (e.g., 220kΩ); asserts low when LBI <200mV; high-Z when SHDN = 0V. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous light-load operation | Eliminates Burst Mode ripple - essential for powering analog sensors, ADC references, or RF bias rails where low-frequency noise degrades SNR. |
| 36V switch voltage rating | Supports >30V output configurations (e.g., 12V LCD bias, 24V industrial I/O) without external clamp or Zener protection. |
| ±2% low-battery reference accuracy | Enables precise battery fuel gauging and system shutdown at defined cell voltage thresholds across full industrial temperature range. |
| Start-up into heavy loads | Delivers full 2A+ peak switch current at startup - avoids brownout during capacitor charging, unlike bootstrapped converters. |
| External VC compensation | Allows tuning of loop response for diverse output capacitors (tantalum, ceramic, polymer), ensuring stability with ESR as low as 10mΩ. |
Applications
| Digital Camera Power Supply | LCD Bias Generation |
|---|---|
Use Scenario: Powers CCD/CMOS image sensor and analog front-end from single Li-ion cell (3.0–4.2V), requiring clean 3.3V or 5V rail with minimal ripple. IC Role / Device Role / Timing Role: Primary boost regulator delivering regulated output; operates continuously at all load levels including preview mode (low current) and capture burst (high current). Use Value: Continuous switching prevents low-frequency ripple that would manifest as banding or noise in captured images. |
Use Scenario: Generates 12V–24V bias for TFT-LCD gate drivers and source drivers in portable medical displays and industrial HMIs. IC Role / Device Role / Timing Role: High-voltage boost converter with 36V switch rating; configured for 15V output using feedback divider; handles dynamic load steps during screen refresh. Use Value: Enables compact, single-stage 15V generation from 3.3V system rail - avoiding cascaded converters and reducing BOM count. |
| Handheld Computer System Rail | Battery-Backed Real-Time Clock Supply |
Use Scenario: Supplies 5V to USB peripherals and SD card interface in ruggedized handheld terminals operating from 2×AA alkaline batteries (1.8–3.0V). IC Role / Device Role / Timing Role: Main system boost converter; manages wide input variation across battery discharge curve; integrates LBO for low-voltage warning. Use Value: 1V minimum start-up and 2.5mA light-load IQ extend usable battery life by >15% compared to non-micropower alternatives. |
Use Scenario: Maintains 3.3V RTC supply during main system shutdown, powered from depleted primary battery (down to 1.0V) via backup coin cell path. IC Role / Device Role / Timing Role: Ultra-low-input boost regulator; uses LBI to monitor primary battery voltage and assert LBO to trigger switchover logic before brownout. Use Value: ±2% LBI threshold accuracy ensures deterministic RTC switchover at 2.00V ±20mV - preventing time loss or corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1308AIS8#TRPBF | Features Burst Mode operation; 140μA no-load IQ vs 2.5mA; same pinout and package. | Introduces ~100Hz–1kHz output ripple at light loads; unsuitable for noise-sensitive analog rails. | Select when maximizing battery life at very low average loads (e.g., wireless sensor nodes with long sleep intervals) outweighs ripple concerns. |
| MAX77801ETE+T | 3MHz switching, integrated MOSFETs, 1.8V–5.5V input; smaller solution size but lower max output voltage (5.5V). | Lacks low-battery detector and 36V switch rating; not suitable for >6V outputs or battery monitoring. | Select for space-constrained designs needing 3.3V/5V from 2.7–4.5V inputs where high-frequency operation reduces EMI filtering requirements. |
Compared with LT1308AIS8#TRPBF, LT1308BIS8#TRPBF trades 2.36mA higher light-load current for ripple-free regulation - critical for analog signal chains. Versus MAX77801ETE+T, it offers higher output voltage capability and integrated battery monitoring, at the cost of larger passive components and lower switching frequency.
Availability
LT1308BIS8#TRPBF is available at Aetrix Electronics and suitable for digital camera power supplies, LCD bias generation, handheld computer system rails, and battery-backed real-time clock supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1308BIS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1308BIS8#TRPBF belongs to Linear's legacy micropower DC/DC converter family, designed specifically for battery-powered portable equipment requiring high efficiency across wide input ranges, robust start-up capability, and integrated system monitoring functions.
FAQ
What is the maximum output voltage achievable with LT1308BIS8#TRPBF?
The LT1308BIS8#TRPBF supports output voltages up to 34V, limited by its 36V-rated internal switch. This is achieved using an external resistor divider on the FB pin, referencing the 1.22V internal feedback voltage. For example, a 12V output requires R1 = 887kΩ and R2 = 100kΩ. Output stability must be verified with appropriate compensation on the VC pin.
Does LT1308BIS8#TRPBF require an external compensation network?
Yes, the LT1308BIS8#TRPBF requires an external RC network connected between the VC pin and ground to stabilize the control loop. A typical configuration uses 47kΩ and 100pF. This network compensates for variations in output capacitor ESR and inductance, ensuring stable regulation across load and temperature - especially critical when using low-ESR ceramic capacitors.
How does the low-battery detector in LT1308BIS8#TRPBF operate?
The LT1308BIS8#TRPBF includes a precision low-battery detector with a ±2% accurate 200mV internal reference. When the voltage on the LBI pin falls below this threshold, the open-collector LBO pin pulls low (≤0.25V at 50μA sink). The detector remains active only when SHDN is enabled (≥1V); it is disabled during shutdown to conserve power.
Can LT1308BIS8#TRPBF start up into a precharged output capacitor?
Yes, the LT1308BIS8#TRPBF can start up into a precharged output capacitor or heavy load - a key differentiator from bootstrapped converters. Its internal switch and current-limit architecture allow it to deliver >3A peak current during startup, enabling reliable regulation even when the output is initially shorted or fully charged to target voltage.
What is the difference between LT1308BIS8#TRPBF and LT1308AIS8#TRPBF?
The LT1308BIS8#TRPBF uses continuous switching at all load levels, resulting in 2.5mA quiescent current and zero low-frequency output ripple. In contrast, the LT1308AIS8#TRPBF enters Burst Mode below ~400mA, reducing IQ to 140μA but introducing 100Hz–1kHz ripple. Both share identical pinout, package, and specifications except for this operational mode distinction.
LT1308BIS8#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
LT1308BIS8#TRPBF FAQ
1.How can I place an order for LT1308BIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308BIS8#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 LT1308BIS8#TRPBF reliable?
The price and inventory of LT1308BIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308BIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1308BIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308BIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308BIS8#TRPBF?
LT1308BIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308BIS8#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 LT1308BIS8#TRPBF?
For technical support, including LT1308BIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308BIS8#TRPBF requirements.
6.How does Aetrix verify that LT1308BIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1308BIS8#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 LT1308BIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1308BIS8#TRPBF?
All LT1308BIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308BIS8#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 LT1308BIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1308BIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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