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Analog Devices Inc. LT1304CS8-5#PBF
- Part No.:
- LT1304CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1304CS8-5#PBF.pdf
- Description:
- IC REG BST SEPIC 5V 800MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,134
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Product details
Overview
LT1304CS8-5#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector, designed for 2-cell alkaline/NiMH to regulated 5V conversion. It operates from 1.5V to 8V input, delivers up to 200mA output at 5V, features 120µA active quiescent current and 10µA shutdown current with detector active, and uses an internal 1A NPN switch with 370mV saturation voltage at 1A - ideal for portable instrumentation and barcode scanners.
For engineers reviewing the LT1304CS8-5#PBF datasheet, LT1304CS8-5#PBF pinout, LT1304CS8-5#PBF application, or LT1304CS8-5#PBF equivalent, key selection criteria include its fixed 5V output accuracy (±4.5% over temperature), active low-battery detection during shutdown (1.17V threshold with 35mV hysteresis), programmable peak switch current via ILIM pin, and SO-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The LT1304CS8-5#PBF employs a hysteretic current-mode control architecture with a fixed 6µs on-time and 1.5µs off-time, enabling up to 300kHz switching without external compensation. Its independent low-battery detector (LBI/LBO) remains fully functional in shutdown mode, operating down to VIN ≈ 1.4V and providing open-collector output capable of sinking 500µA.
Internal 1A NPN switch features low VCE(SAT) (370mV typ. at 1A), while the SENSE (FB) pin monitors output via internal resistor divider for 5.05V regulation (4.80–5.25V min/max). The ILIM pin allows peak current reduction using a single external resistor, supporting design flexibility for lower-power inductors and diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V (4.80–5.25V range); enables direct replacement of 5V LDOs in battery systems without feedback resistors. |
| Input Voltage Range | 1.5V to 8V; supports operation from 2-cell alkaline (1.8–3.2V) through 4-cell NiMH (4.8–6.0V) without input stage modification. |
| Quiescent Current | 120µA in active mode; ensures >1-year shelf life in always-on portable devices powered by two AA cells. |
| Shutdown Quiescent Current | 10µA with LBO active; maintains battery monitoring capability during deep sleep without compromising runtime. |
| Peak Switch Current | 1A (ILIM pin floating); sufficient for 200mA @ 5V output with typical 85–90% efficiency at 2.5V input. |
| Low-Battery Threshold | 1.17V (±80mV) on LBI pin with 35mV hysteresis; prevents false triggers during transient load dips in weak battery conditions. |
| Switch Saturation Voltage | 370mV at 1A; minimizes conduction loss in high-current pulses, critical for maintaining efficiency below 2V input. |
Pinout & Package
LT1304CS8-5#PBF is housed in an 8-lead plastic SO (Small Outline, narrow 0.150") package per LTC DWG #05-08-1610, with standard SOIC-8 footprint and 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI (Pin 1) | Low-battery detector input | Hysteretic comparator input referenced to 1.17V; must be connected to battery divider for undervoltage warning. |
| LBO (Pin 2) | Low-battery detector output | Open-collector output active-low; requires external pull-up to enable system-level battery status flag generation. |
| VIN (Pin 3) | Main power input | Accepts 1.5–8V; requires local 1–100µF low-ESR bypass capacitor placed within 0.2" to minimize switching noise. |
| SW (Pin 4) | Switch collector node | Connects to inductor and Schottky diode anode; trace must be short and wide to reduce EMI and RFI radiation. |
| GND (Pin 5) | Power and signal ground | Low-impedance return path; must connect directly to PCB ground plane to stabilize reference and reduce noise coupling. |
| ILIM (Pin 6) | Peak current limit set | Resistor-to-ground sets switch current (e.g., 22kΩ → ~500mA); also supports soft-start via RC network. |
| SHDN (Pin 7) | Shutdown control | Active-low logic input; tie to VIN if unused; drives device into 10µA shutdown while preserving LBO functionality. |
| SENSE/FB (Pin 8) | Output voltage sense | Internally connected to 5V divider; no external resistors needed; disconnected during shutdown to prevent leakage. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 120µA active / 10µA shutdown current enables multi-year battery life in intermittent-use portable instruments. |
| Integrated low-battery detector | Remains fully operational in shutdown mode with 1.17V threshold and 35mV hysteresis - no external comparator required. |
| Programmable peak switch current | Single resistor from ILIM to GND scales peak current from 1A down to ~500mA, allowing smaller magnetics and diodes. |
| High-efficiency boost topology | Delivers >85% efficiency at 200mA/5V from 2.5V input using standard 22µH inductor and Schottky diode. |
| Robust NPN switch | 370mV VCE(SAT) at 1A reduces conduction loss, critical for maintaining regulation under low-input-voltage conditions. |
| SO-8 package | Industry-standard 8-pin SOIC footprint enables drop-in replacement in existing layouts and simplifies PCB assembly. |
Applications
| Portable Barcode Scanners | Palmtop Computers |
|---|---|
|
Use Scenario: Powering CMOS image sensors and laser drivers from two AA cells in handheld scanning units. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5V rail for sensor bias and digital logic, with LBO signaling end-of-life battery to firmware. Use Value: Enables continuous 200mA output at 5V from 1.8V minimum input, extending usable battery life by 30% vs. linear regulators. |
Use Scenario: Supplying 5V to microcontroller, SRAM, and LCD controller in compact palmtop PDAs. IC Role / Device Role / Timing Role: Primary DC/DC converter with shutdown-controlled power sequencing and battery health monitoring via LBO. Use Value: 10µA shutdown current preserves battery charge during suspend mode while retaining real-time battery status. |
| Diagnostic Medical Instruments | Personal Data Communicators |
|
Use Scenario: Providing isolated 5V for analog front-end circuitry and USB interface in battery-powered glucose meters. IC Role / Device Role / Timing Role: Regulated power source with precise 5.05V output and low-noise operation critical for ADC reference stability. Use Value: Fixed-output accuracy (±4.5%) eliminates need for trimming, reducing BOM count and calibration complexity. |
Use Scenario: Powering RF transceivers and flash memory in early-generation wireless PDAs operating on dual AA cells. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 200mA at 5V with burst-mode-like light-load behavior. Use Value: 120µA quiescent current ensures >6 months standby time between charges in always-connected communication devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX756CPA+ | Fixed 5V output, 300kHz switching, 1.5V–6.5V input, 100µA IQ, no integrated low-battery detector. | Lacks LBI/LBO functionality; requires external comparator for battery monitoring. | Choose when low-cost, simple 5V boost is needed without battery state awareness. |
| TPS61200DRCR | Adjustable output (1.8–5.5V), 3.3V default, 1.8V–5.5V input, 120µA IQ, integrated LDO mode, no dedicated LBO pin. | Provides voltage flexibility but no open-collector low-battery flag; uses I²C for status reporting. | Prefer when programmable output and digital interface outweigh need for analog LBO signaling. |
Compared with MAX756CPA+ and TPS61200DRCR, the LT1304CS8-5#PBF uniquely combines fixed 5V regulation, ultra-low shutdown IQ with always-active LBO, and SO-8 compatibility - making it optimal for cost-sensitive, battery-status-aware portable instruments where analog flagging and minimal external components are essential.
Availability
LT1304CS8-5#PBF is available at Aetrix Electronics and suitable for portable instrumentation, barcode scanning equipment, and diagnostic medical devices requiring stable component supply with long-term lifecycle support.
Supply support for LT1304CS8-5#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 full technical and manufacturing continuity for legacy Linear power products.
The LT1304 series was designed specifically for micropower, low-input-voltage boost conversion in space-constrained, battery-operated systems - emphasizing ultra-low quiescent current, integrated battery monitoring, and robust operation down to 1.5V.
FAQ
What is the output voltage tolerance of the LT1304CS8-5#PBF over temperature and line/load conditions?
The LT1304CS8-5#PBF delivers a nominal 5.05V output with guaranteed limits of 4.80V to 5.25V across the full 0°C to 70°C operating temperature range, 1.5V to 8V input, and 1mA to 200mA load. This ±4.5% tolerance is achieved via factory-trimmed internal resistor divider, eliminating need for external feedback components in the LT1304CS8-5#PBF.
Can the LT1304CS8-5#PBF operate from a single Li-ion cell?
No - the LT1304CS8-5#PBF requires minimum 1.5V input, but its internal circuitry and switch characteristics are optimized for 2–4 alkaline/NiMH cells (1.8–6.0V typical). While it may start at 2.7V, performance degrades significantly below 2.0V input; for single Li-ion (2.7–4.2V), consider the LT1302 or TPS61200 instead of the LT1304CS8-5#PBF.
How does the low-battery detector behave during shutdown of the LT1304CS8-5#PBF?
The low-battery detector remains fully active during LT1304CS8-5#PBF shutdown: LBI continues sensing battery voltage, and LBO provides open-collector output that pulls low when LBI falls below 1.17V (with 35mV hysteresis). This allows host systems to monitor battery health even when main power is disabled - a defining feature of the LT1304CS8-5#PBF.
What is the maximum achievable output current from the LT1304CS8-5#PBF at 5V with 2-cell alkaline input?
At 2.5V input and 5V/200mA output, the LT1304CS8-5#PBF achieves ~85% efficiency with proper layout and components (e.g., Sumida CD54-220 inductor, MBRS130L Schottky). Output current is limited by thermal dissipation and switch duty cycle; sustained 200mA is verified in typical applications, though peak pulsed loads may reach 250mA briefly before thermal foldback.
Is the LT1304CS8-5#PBF RoHS compliant and lead-free?
Yes - the LT1304CS8-5#PBF carries the #PBF suffix, indicating lead-free (Pb-free) and RoHS-compliant packaging per Analog Devices' specifications. The SO-8 package uses matte tin lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements for surface-mount assembly.
LT1304CS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA (Switch)
- Frequency - Switching:
- Up to 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1304CS8-5#PBF FAQ
1.How can I place an order for LT1304CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1304CS8-5#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 LT1304CS8-5#PBF reliable?
The price and inventory of LT1304CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1304CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1304CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1304CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1304CS8-5#PBF?
LT1304CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1304CS8-5#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 LT1304CS8-5#PBF?
For technical support, including LT1304CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1304CS8-5#PBF requirements.
6.How does Aetrix verify that LT1304CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1304CS8-5#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 LT1304CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1304CS8-5#PBF?
All LT1304CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1304CS8-5#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 LT1304CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1304CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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