My Inquiry
My Account
Analog Devices Inc. LT1308CS8#TRPBF
- Part No.:
- LT1308CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308CS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,915
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1308CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency boost DC/DC converter IC designed for single-cell battery-powered systems. It delivers 5V at 1A from a 1V–4.2V Li-Ion input, features 600kHz current-mode PWM switching, 1.22V feedback reference, and integrated low-battery detection with 200mV threshold. Used in GSM RF power stages and digital camera bias supplies.
For engineers reviewing the LT1308CS8#TRPBF datasheet, LT1308CS8#TRPBF pinout, LT1308CS8#TRPBF application, or LT1308CS8#TRPBF equivalent, key selection criteria include minimum 1V start-up capability, 2A internal NPN switch with 300mV VCE(SAT), Burst Mode™ operation for light-load efficiency, and SO-8 package compatibility with compact PCB layouts.
Technical Context
The LT1308CS8#TRPBF employs current-mode PWM control with a 600kHz oscillator and internal ramp generator, enabling fast transient response to load and line variations. Its error amplifier features 100V/V gain (25°C), 40µmhos transconductance, and VC pin compensation via external RC network (e.g., 47kΩ + 22nF).
It integrates a low-battery detector with 200mV reference, LBI/LBO pins for external voltage monitoring, and shutdown logic that reduces quiescent current to 3µA. The internal 2A NPN switch operates with ≤350mV saturation voltage across –20°C to 70°C, supporting high-efficiency boost conversion without external MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 6V - enables direct operation from single Li-Ion (2.7–4.2V), NiCd (1.0–1.4V), or alkaline cells without pre-regulation. |
| Output Voltage Accuracy | ±1.6% over temp - set by 1.22V ±20mV feedback reference, ensuring stable 3.3V/5V regulation with external resistor divider. |
| Switching Frequency | 500–750kHz - allows use of small 3.3–4.7µH inductors and ceramic output capacitors, reducing board area vs. lower-frequency converters. |
| Quiescent Current | 100µA (no load) - extends battery life in standby mode; drops to 3µA in shutdown, critical for always-on portable devices. |
| Switch Current Limit | 2.0–2.5A (DC = 40%) - supports 1A continuous output at 5V with margin for pulsed GSM/DECT loads up to 400mA–1A peak. |
| Low-Battery Threshold | 180–220mV - precise 200mV reference enables accurate cell voltage monitoring for system-level battery management. |
| Efficiency Range | 65–95% (1mA–1A load) - maintains >80% efficiency down to 10mA, essential for mixed-signal portable applications with variable duty cycles. |
Pinout & Package
LT1308CS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8, narrow 0.150") package with θJA = 80°C/W and maximum junction temperature of 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBO | Low-battery detector open-collector output | Sinks 10µA; requires 1MΩ pullup; signals battery depletion to host processor when LBI < 200mV. |
| LBI | Low-battery detector input | Accepts divided battery voltage; internal 200mV reference compares against LBI to trigger LBO assertion. |
| VIN | Main power input | Supplies internal circuitry and switch driver; requires local 10µF ceramic bypass within 5mm to prevent oscillation. |
| SW | Switch node | Connects to inductor/diode; carries high di/dt switching current; trace area must be minimized to reduce EMI. |
| VC | Error amplifier compensation | External RC network (e.g., 47kΩ + 22nF) sets loop stability; sensitive node requiring minimal trace area. |
| FB | Feedback input | Monitors output via resistor divider; 1.22V reference sets VOUT = 1.22V × (1 + R1/R2); high-impedance input (≤80nA bias). |
| SHDN | Shutdown control | Ground to disable; tie to VIN or higher to enable; floating causes erratic behavior; sink/source current ≤26µA. |
| GND | Power and signal ground | Must connect directly to local ground plane enclosing all power components; shared return for SW, FB, VC paths. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~200mA load to maintain >80% efficiency at microamp-level currents, extending runtime in intermittent-use devices. |
| 1V minimum start-up voltage | Enables full functionality from deeply discharged single-cell batteries (e.g., 1.0V NiCd), eliminating need for auxiliary wake-up circuits. |
| Integrated 2A NPN switch | Eliminates external transistor; 300mV VCE(SAT) at 2A minimizes conduction loss and thermal rise in space-constrained designs. |
| Current-mode PWM architecture | Provides inherent cycle-by-cycle current limiting and fast load-step response (<10µs), critical for pulsed RF and camera flash loads. |
| Low-battery comparator with 200mV reference | Enables accurate end-of-life detection using only two external resistors; LBO output interfaces directly with µC GPIO pins. |
Applications
| GSM Mobile Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering RF power amplifier stages during 577µs transmit bursts in GSM-900/1800 handsets using a single Li-Ion cell. IC Role / Device Role / Timing Role: Boost converter providing regulated 5V rail with fast transient response to 100mA–1A load steps synchronized to TDMA frame timing. Use Value: Maintains VOUT droop <50mV under 1A pulse load at VIN = 2.7V using 2200µF bulk capacitance, ensuring RF output power stability. |
Use Scenario: Generating multiple bias rails (3.3V, 5V, ±10V, 18V) for CCD image sensors and analog front-end circuitry from 1.6–6V input. IC Role / Device Role / Timing Role: Primary boost controller in multi-output flyback-derived topology, coordinating inductor energy transfer across four windings. Use Value: Delivers 175mA at 3.3V and 5V plus 10mA at ±10V/18V simultaneously with <1% cross-regulation, enabling compact sensor modules. |
| DECT Cordless Phones | Portable Answer-Back Pagers |
Use Scenario: Supplying 3.3V/400mA pulsed power to DECT baseband and RF sections during 416µs transmit intervals from a single NiCd cell. IC Role / Device Role / Timing Role: High-current boost regulator operating in Burst Mode™ between pulses to minimize average current draw during idle periods. Use Value: Achieves >85% efficiency at 400mA peak while maintaining 100µA average quiescent current, extending talk time beyond 4 hours per charge. |
Use Scenario: Providing regulated 5V supply to microcontroller, RF receiver, and LCD backlight in low-duty-cycle pagers powered by alkaline button cells. IC Role / Device Role / Timing Role: Micropower DC/DC converter activated only during message reception windows, remaining in <3µA shutdown between alerts. Use Value: Enables 6-month battery life on CR2032 cells by limiting active-time current to <100µA and leveraging 1V start-up capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307CS8#TRPBF | Lower 75mA output current, MSOP-8 package, no low-battery detector, 3.3V fixed output option. | Suitable only for ultra-low-power peripherals (e.g., Bluetooth headsets), not RF power stages. | Select when size and cost outweigh current capability; not drop-in for LT1308CS8#TRPBF's 1A load requirement. |
| TPS61040DRVR | 500kHz switching, 28V VSW rating, 0.5A switch, no integrated LBO/LBI, 2.5V min VIN. | Lacks battery monitoring; requires external circuitry for low-VIN detection below 2.5V. | Choose for higher-VIN systems (>2.5V) where footprint and TI supply chain preference dominate; not suitable for 1V start-up. |
Compared with LT1308CS8#TRPBF, LT1307CS8#TRPBF trades output current and monitoring features for smaller size, while TPS61040DRVR offers higher voltage tolerance but sacrifices single-cell usability and integrated battery sensing-making LT1308CS8#TRPBF uniquely suited for 1V–4.2V battery-powered RF and imaging systems requiring both high current and intelligent power management.
Availability
LT1308CS8#TRPBF is available at Aetrix Electronics and suitable for GSM handset RF power supplies, digital camera CCD bias generation, DECT cordless phone transceivers, portable medical monitors, and low-power industrial telemetry nodes requiring stable component supply across extended product lifecycles.
Supply support for LT1308CS8#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, inheriting its legacy of high-performance analog and power management ICs targeting precision, efficiency, and reliability in demanding applications.
The LT1308CS8#TRPBF belongs to Linear's micropower DC/DC converter family, engineered specifically for battery-operated portable electronics where 1V start-up, low quiescent current, and integrated battery monitoring are mandatory design requirements.
FAQ
What is the minimum input voltage required for LT1308CS8#TRPBF to start switching?
The LT1308CS8#TRPBF guarantees start-up into full load with input voltage as low as 1V, verified across the commercial temperature range (–20°C to 70°C). At –40°C, minimum start-up voltage increases to 1.2V. This 1V capability enables operation from nearly depleted single-cell batteries, a key differentiator for portable equipment designers.
Does LT1308CS8#TRPBF support adjustable output voltage, and how is it configured?
Yes, LT1308CS8#TRPBF supports fully adjustable output voltage via external resistor divider on the FB pin. With a precise 1.22V feedback reference, VOUT = 1.22V × (1 + R1/R2). For example, 5V output uses R1 = 301kΩ and R2 = 100kΩ; 3.3V uses R1 = 169kΩ and R2 = 100kΩ. Layout guidelines specify minimizing trace area at FB to avoid noise coupling.
How does the low-battery detection function work on LT1308CS8#TRPBF?
The LT1308CS8#TRPBF integrates a 200mV precision reference and comparator. Voltage from a resistor divider on LBI is compared to this reference; when LBI falls below 180–220mV, LBO pulls low (≤0.25V at 10µA sink). LBO is open-collector and requires a 1MΩ pullup. Detection is disabled when SHDN is grounded.
What is the purpose of the VC pin on LT1308CS8#TRPBF, and what components are needed?
The VC pin on LT1308CS8#TRPBF is the error amplifier compensation node. A series RC network (e.g., 47kΩ resistor + 22nF capacitor) must be connected from VC to GND to stabilize the control loop. This network sets dominant pole frequency and phase margin; trace area at VC must be minimized to prevent noise injection and oscillation.
Can LT1308CS8#TRPBF drive a 1A load continuously at 5V from a 3.6V Li-Ion cell?
Yes, LT1308CS8#TRPBF is rated to deliver 5V at 1A from a single Li-Ion cell (3.6V nominal). Efficiency exceeds 85% at this condition, and thermal performance remains within limits (TJ < 125°C) with standard SO-8 PCB copper area. The internal 2A NPN switch with 300mV VCE(SAT) ensures adequate headroom for sustained 1A output.
LT1308CS8#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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1308CS8#TRPBF FAQ
1.How can I place an order for LT1308CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308CS8#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 LT1308CS8#TRPBF reliable?
The price and inventory of LT1308CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1308CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308CS8#TRPBF?
LT1308CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308CS8#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 LT1308CS8#TRPBF?
For technical support, including LT1308CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308CS8#TRPBF requirements.
6.How does Aetrix verify that LT1308CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1308CS8#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 LT1308CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1308CS8#TRPBF?
All LT1308CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308CS8#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 LT1308CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1308CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1308CS8#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…
