My Inquiry
My Account
Analog Devices Inc. LT1308CS8#PBF
- Part No.:
- LT1308CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308CS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,732
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1308CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency boost DC/DC converter IC designed for single-cell battery systems. It delivers 5V at 1A from a 1V–4.2V Li-Ion input, features 600kHz current-mode PWM switching, integrated 2A NPN switch with 300mV VCE(SAT), and Burst Mode™ operation for light-load efficiency. Used in GSM RF power stages and digital camera bias supplies.
For engineers reviewing the LT1308CS8#PBF datasheet, LT1308CS8#PBF pinout, LT1308CS8#PBF application, or LT1308CS8#PBF equivalent, key selection criteria include minimum 1V start-up voltage, guaranteed 1A output capability into full load, low-battery detection with 200mV threshold, and SO-8 package compatibility with compact PCB layouts for portable electronics.
Technical Context
The LT1308CS8#PBF 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) and 40µmhos transconductance, compensated via external RC network on VC pin.
Built-in functions include a precision 200mV low-battery comparator (LBI/LBO), shutdown control with <3µA quiescent current, and automatic Burst Mode™ operation below ~200mA load. The device operates across –20°C to 70°C and supports input voltages from 1V to 6V with up to 95% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz ±100kHz - enables use of small 4.7µH inductors and ceramic output capacitors |
| Input Voltage Range | 1V to 6V - supports direct operation from single Li-Ion (2.7–4.2V), NiCd (1.0–1.4V), or alkaline cells |
| Output Current Capability | 1A continuous - sustained at 5V from 4.2V input; validated in Figure 1 and GSM transient tests |
| Quiescent Current | 100µA (no-switching) - minimizes battery drain in standby; drops to 3µA in shutdown |
| Feedback Reference Voltage | 1.22V ±20mV - sets output via resistor divider; enables precise 3.3V, 5V, or custom outputs |
| Low-Battery Threshold | 200mV ±20mV - triggers LBO open-collector output when battery voltage falls below setpoint |
| Switch VCE(SAT) | 300mV at 2A (25°C) - limits conduction loss and thermal rise in high-current boost paths |
| Operating Temperature | –20°C to 70°C - commercial-grade rating suitable for consumer handhelds and portable instrumentation |
Pinout & Package
LT1308CS8#PBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package per LTC DWG #05-08-1610, with θJA = 80°C/W and maximum junction temperature of 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBO | Low-battery detector output | Open-collector NPN output; sinks 10µA; requires external 1MΩ pullup for logic-level signaling to host processor |
| LBI | Low-battery detector input | Connects to resistive divider from VIN; 200mV reference threshold; bias current flows out (5–30nA) |
| VIN | Main power input | Supplies internal circuitry and switch driver; requires local 10µF ceramic bypass capacitor placed ≤5mm away |
| SW | Switch node | Drives external inductor/diode; high di/dt node-minimize trace area to reduce EMI and ringing |
| VC | Error amplifier compensation | Connect series RC (e.g., 47kΩ + 22nF) to GND; stabilizes loop response for varying loads and input conditions |
| FB | Feedback input | Monitors output via resistor divider; 1.22V reference sets VOUT = 1.22V × (1 + R1/R2); sensitive node-minimize trace area |
| SHDN | Shutdown control | Ground to disable; tie to VIN or higher to enable; floating causes erratic behavior; sink/source current <4µA |
| GND | Power and signal ground | Must connect directly to solid local ground plane; encloses all power components to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell 1V start-up capability | Enables operation from depleted Li-Ion or NiCd cells down to 1.0V, extending usable battery life in portable devices |
| Guaranteed full-load start-up | Starts and regulates into 1A load without external soft-start; eliminates output droop during power-on sequencing |
| Burst Mode™ operation | Reduces quiescent current to ~100µA at light loads (<200mA), maintaining >80% efficiency down to 1mA output |
| Integrated 2A NPN power switch | Eliminates external transistor; 300mV VCE(SAT) at 2A limits I²R losses and simplifies thermal design in space-constrained layouts |
| Low-battery comparator with 200mV reference | Provides system-level battery monitoring without external references or comparators; LBO output interfaces directly to microcontroller GPIO |
| Current-mode PWM architecture | Delivers low output ripple and stable regulation across wide input/output ratios; inherently cycle-by-cycle current limiting improves reliability |
Applications
| GSM RF Power Supply | Digital Camera CCD Bias |
|---|---|
Use Scenario: Powers GSM transmitter PA stage from single Li-Ion cell during 577µs transmit bursts. IC Role / Device Role / Timing Role: Boost converter providing regulated 5V at pulsed 1A load; synchronized to TDMA frame timing. Use Value: Maintains stable VOUT under rapid 100mA→1A transients (Figures 7–10); 600kHz switching avoids interference with GSM receive band. | Use Scenario: Generates multiple rails (3.3V, 5V, ±10V, 18V) for CCD sensor and analog front-end in compact digital cameras. IC Role / Device Role / Timing Role: Primary boost controller in multi-output flyback-derived topology (Figure TA01); drives transformer-coupled secondaries. Use Value: Single-chip solution replaces discrete boost + charge pump; 1V start-up supports operation from partially discharged batteries during extended capture sessions. |
| DECT Phone Transmitter | Battery-Backed Memory Supply |
Use Scenario: Supplies 3.3V/400mA pulsed output for DECT base station or handset RF section using 416µs transmit slots. IC Role / Device Role / Timing Role: High-efficiency boost regulator delivering burst-mode current; optimized for 1.2V NiCd input (Figure 11). Use Value: Achieves >70% efficiency at 400mA pulse with 100µF output cap; low 100µA quiescent current preserves battery between calls. | Use Scenario: Maintains SRAM or real-time clock voltage during main power failure in industrial controllers or medical devices. IC Role / Device Role / Timing Role: Standby boost converter activated by low-VIN detection; holds 3.3V rail using primary battery or supercapacitor backup. Use Value: Low 3µA shutdown current extends backup runtime; 200mV LBI threshold allows precise brown-out detection before data loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525EDD#TRMPBF | Higher 2MHz switching frequency; 400mA output; uses external MOSFET; no integrated switch | Suited for ultra-compact designs requiring smaller magnetics; lacks low-battery comparator and Burst Mode | Select when board area is critical and load current ≤400mA; requires redesign of power stage and feedback network |
| TPS61040DRVR | 500kHz fixed frequency; 28V output max; 400mA switch; 20µA IQ; no LBI/LBO pins | Targeted at general-purpose boost for displays and sensors; no battery monitoring functionality | Choose for cost-sensitive, non-battery-monitoring applications where 1V start-up and 1A output are not required |
Compared with LT1308CS8#PBF, LTC3525EDD#TRMPBF offers higher frequency but lower current and no integrated battery monitor, while TPS61040DRVR provides lower quiescent current but omits critical features for battery-powered systems-making LT1308CS8#PBF uniquely suited for 1A, single-cell, low-battery-aware designs.
Availability
LT1308CS8#PBF is available at Aetrix Electronics and suitable for GSM terminals, digital cameras, DECT phones, and battery backup supplies requiring stable component supply across long-lifecycle portable electronics programs.
Supply support for LT1308CS8#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 and maintains its legacy precision analog and power management portfolio. The company specializes in high-performance signal conditioning and power conversion ICs for demanding industrial and communications applications.
LT1308CS8#PBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for energy-constrained, single-cell portable systems requiring high peak current, low quiescent power, and integrated battery health monitoring.
FAQ
What is the minimum input voltage required for LT1308CS8#PBF to start switching?
The LT1308CS8#PBF guarantees start-up with input voltage as low as 1.0V at room temperature, and 1.2V over the full –40°C to 85°C industrial range. This enables reliable operation from deeply discharged single-cell batteries. The device maintains regulation down to 1V input while delivering full 1A output, as verified in typical performance curves and application circuits like Figure 1 and Figure 6.
Does LT1308CS8#PBF support automatic light-load efficiency optimization?
Yes, the LT1308CS8#PBF features proprietary Burst Mode™ operation that activates automatically below ~200mA load. In this mode, the IC reduces switching frequency and gate drive activity to maintain ~100µA quiescent current while sustaining regulation-critical for extending battery life in standby or intermittent-use applications such as pagers and answer-back devices.
Can LT1308CS8#PBF be used with a 1.2V NiCd cell to generate 3.3V?
Yes, the LT1308CS8#PBF is explicitly rated for 3.3V at 300mA from a single NiCd cell (1.0–1.4V), as stated in the "TYPICAL APPLICATION" section and validated in Figure 11. With appropriate output capacitance (100µF) and feedback resistors (R1 = 169kΩ), it delivers stable 3.3V under 416µs DECT transmit pulses-even at 1.2V input.
What is the function of the VC pin on LT1308CS8#PBF, and how should it be configured?
VC is the error amplifier compensation pin on the LT1308CS8#PBF. It must be connected to ground via a series RC network-typically 47kΩ and 22nF-to stabilize the control loop. This configuration ensures robust transient response across input and load variations, as shown in Figure 1 and layout guidelines. Improper VC network design risks oscillation or poor regulation.
Is LT1308CS8#PBF pin-compatible with other members of the LT130x family?
No, LT1308CS8#PBF is not pin-compatible with LT1302, LT1304, or LT1307. While functionally related, each variant has distinct pinouts: LT1308 uses LBI/LBO for battery monitoring, whereas LT1307 (MSOP) lacks those pins entirely, and LT1302 places SHDN on a different pin. Board-level replacement requires schematic and layout revision.
LT1308CS8#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
- 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#PBF FAQ
1.How can I place an order for LT1308CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308CS8#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 LT1308CS8#PBF reliable?
The price and inventory of LT1308CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1308CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308CS8#PBF?
LT1308CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308CS8#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 LT1308CS8#PBF?
For technical support, including LT1308CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308CS8#PBF requirements.
6.How does Aetrix verify that LT1308CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1308CS8#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 LT1308CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1308CS8#PBF?
All LT1308CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308CS8#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 LT1308CS8#PBF part is unused and in its original packaging.
Return procedure for LT1308CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1308CS8#PBF 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…
