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Analog Devices Inc. LT1304CS8#TRPBF
- Part No.:
- LT1304CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1304CS8#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 800MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,257
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Product details
Overview
LT1304CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector, designed for battery-operated systems requiring regulated 5V output from 1.5V–8V input. It delivers up to 200mA 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. It enables compact 2-cell-to-5V power conversion in portable instrumentation and bar code scanners.
For engineers reviewing the LT1304CS8#TRPBF datasheet, LT1304CS8#TRPBF pinout, LT1304CS8#TRPBF application, or LT1304CS8#TRPBF equivalent, key selection criteria include its 5V fixed output, 8-pin SOIC package, 1.5V minimum start-up voltage, active low-battery detection during shutdown, and programmable peak switch current via ILIM pin - all critical for ultra-low-power battery life optimization.
Technical Context
The LT1304CS8#TRPBF implements a hysteretic current-mode boost controller with independent low-battery comparator (A3) that remains powered in shutdown. Its 6µs fixed on-time and 1.5µs off-time enable high-frequency operation up to 300kHz, supporting small external magnetics.
It integrates a 1A NPN power switch with 370mV VCE(SAT) at 1A, uses FB/SENSE pin for output regulation feedback (3.3V or 5V variants use internal resistor divider), and maintains LBO open-collector output active down to VIN ≈ 1.4V - below the main regulator's undervoltage lockout threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V typical (±4.5% tolerance over line/load/temp); enables direct replacement of 5V LDOs without external feedback resistors. |
| Input Voltage Range | 1.5V to 8V; supports operation from 2 alkaline cells (fresh ~3.2V, end-of-life ~2.0V) through 6-cell NiMH or single Li-ion. |
| Quiescent Current | 120µA in active mode, 10µA in shutdown (with LBI/LBO active); preserves battery capacity during standby in portable devices. |
| Peak Switch Current | 1A nominal (ILIM pin floating); reduced to 500mA with 22kΩ to GND - allows smaller inductors and diodes in lower-power designs. |
| Switch Saturation Voltage | 370mV typical at 1A; minimizes conduction loss and improves efficiency at high load currents. |
| Low-Battery Threshold | LBI trip at 1.17V ±65mV hysteresis; LBO sinks 500µA when triggered - enables reliable battery monitoring without auxiliary circuitry. |
| Package | 8-lead SOIC (narrow, 0.150" width); industry-standard footprint compatible with automated assembly and thermal relief design. |
Pinout & Package
LT1304CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package per LTC DWG #05-08-1610, with 1.27mm pitch, 4.9mm × 6.0mm body, and 1.75mm max height. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI (Pin 1) | Low-battery detector input | Hysteretic comparator input referenced to 1.17V; must be driven by resistive divider from VIN to set battery cutoff point. |
| LBO (Pin 2) | Low-battery detector output | Open-collector output sinking up to 500µA; requires external pull-up; remains functional during shutdown. |
| VIN (Pin 3) | Main input supply | Accepts 1.5V–8V; requires local 1µF ceramic bypass placed within 2mm of pin to suppress switching noise. |
| SW (Pin 4) | Switch collector node | Connects to inductor and Schottky diode anode; trace must be short and wide to minimize RFI and voltage spikes. |
| GND (Pin 5) | Power and signal ground | Low-impedance return path; solder directly to solid ground plane to reduce noise coupling and improve stability. |
| ILIM (Pin 6) | Peak current limit set | Floating = 1A limit; resistor to GND scales peak current linearly (e.g., 22kΩ → ~500mA); also supports soft-start with RC network. |
| SHDN (Pin 7) | Shutdown control | Active-low logic input; <0.4V disables regulator but keeps LBO active; >1.4V enables operation; must not float. |
| FB/SENSE (Pin 8) | Feedback / output sense | On LT1304CS8#TRPBF (5V fixed version), connects internally to resistor divider; used for regulation error amplification. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower shutdown with live battery monitor | 10µA total supply current while LBO remains fully operational - enables system-level battery state awareness without wake-up overhead. |
| Ultra-low minimum operating voltage | 1.5V start-up capability allows full functionality from nearly depleted 2-cell alkaline batteries, extending usable runtime. |
| Integrated 1A NPN switch with low VCE(SAT) | 370mV saturation voltage at 1A reduces conduction loss by >30% vs. comparable 0.5A switches, improving efficiency at 200mA loads. |
| Programmable peak current limit | Single external resistor from ILIM to GND sets peak switch current from 500mA to 1A - enables optimized component selection for cost, size, and efficiency trade-offs. |
| High-frequency burst-mode operation | Up to 300kHz switching frequency permits use of 22µH surface-mount inductors (e.g., Sumida CD54-220), reducing board area by >40% vs. kHz-range converters. |
Applications
| Portable Medical Diagnostics | Handheld Barcode Scanners |
|---|---|
|
Use Scenario: Battery-powered handheld glucose meter requiring stable 5V rail for analog front-end and microcontroller from two AA cells. IC Role / Device Role / Timing Role: Primary step-up regulator providing regulated 5V output; low-battery detector triggers UI alert before measurement accuracy degrades. Use Value: 10µA shutdown current extends shelf life; 1.5V start-up ensures full device operation until battery reaches 1.4V, maximizing usable cell capacity. |
Use Scenario: Compact barcode scanner using CMOS image sensor and laser driver, powered by 2× alkaline AA cells. IC Role / Device Role / Timing Role: Main 5V power source enabling simultaneous sensor readout and laser pulse generation; ILIM pin configured for 500mA to match peak load profile. Use Value: 370mV VCE(SAT) minimizes heat rise in sealed enclosure; 300kHz operation allows 22µH inductor, reducing BOM count and PCB area. |
| Palm-Sized Data Communicators | Low-Power Industrial Sensors |
|
Use Scenario: Personal digital assistant with RS-232 interface, LCD backlight, and flash memory, operating from 2-cell NiMH pack. IC Role / Device Role / Timing Role: System power manager generating 5V for interface ICs and memory; LBO output drives microcontroller GPIO to log battery state. Use Value: Active LBO during shutdown enables firmware-initiated graceful shutdown; 120µA active IQ preserves battery for >100 hours of standby. |
Use Scenario: Wireless temperature sensor node with RF transceiver, running on two AA lithium cells in remote industrial location. IC Role / Device Role / Timing Role: Efficient 5V supply for transceiver IC and precision ADC; programmable ILIM avoids oversized magnetics in space-constrained housing. Use Value: 1.5V minimum input ensures >95% of battery energy is utilized; SOIC-8 package supports reflow-compatible automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX756CPA+ | 5V fixed output, 300kHz max frequency, 350mV dropout at 200mA, no integrated low-battery detector. | Requires external comparator circuit for battery monitoring; less suitable for space-constrained designs needing integrated LBI/LBO. | Choose when LBO functionality is unnecessary and cost sensitivity outweighs integration benefits. |
| TPS61200DRCT | Adjustable output (1.2V–5.5V), 1.2A switch, 5.5µA shutdown IQ, integrated soft-start, no dedicated LBI/LBO pins. | Lacks hardware-based low-battery signaling; relies on host MCU ADC polling, increasing firmware complexity and power overhead. | Prefer when output voltage flexibility and ultra-low shutdown current are prioritized over autonomous battery monitoring. |
Compared with MAX756CPA+ and TPS61200DRCT, LT1304CS8#TRPBF uniquely combines fixed 5V regulation, sub-10µA shutdown IQ with always-on LBO, and SOIC-8 compatibility - making it optimal for legacy-replacement and battery-state-critical portable systems where minimal external components and deterministic shutdown behavior are required.
Availability
LT1304CS8#TRPBF is available at Aetrix Electronics and suitable for portable medical diagnostics, handheld barcode scanners, palm-sized data communicators, and low-power industrial sensors requiring stable component supply and long-term lifecycle support.
Supply support for LT1304CS8#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 and maintains full product support, documentation, and manufacturing continuity for the LT family of precision power and signal conditioning ICs.
The LT1304 series was designed specifically for micropower, low-voltage battery-operated systems requiring high-efficiency step-up conversion with autonomous battery health monitoring - targeting portable instrumentation and diagnostic equipment.
FAQ
What is the minimum input voltage required for LT1304CS8#TRPBF to start switching?
The LT1304CS8#TRPBF starts switching at a minimum input voltage of 1.5V, with typical operation beginning at 1.65V across temperature. This enables full functionality from nearly exhausted 2-cell alkaline batteries, and the device continues regulating until VIN drops to approximately 1.4V - below the main regulator's UVLO threshold but above the LBI comparator's lower hysteresis limit. The LT1304CS8#TRPBF maintains LBO output activity throughout this range.
Does LT1304CS8#TRPBF require external feedback resistors for 5V output?
No, the LT1304CS8#TRPBF is the fixed 5V output variant and contains an internal resistor divider connected to the FB/SENSE pin (Pin 8), eliminating the need for external feedback components. This simplifies layout, reduces BOM count, and improves production consistency compared to adjustable versions like the base LT1304. The LT1304CS8#TRPBF delivers 5.05V typical with ±4.5% tolerance over line, load, and temperature.
How does the low-battery detector behave during shutdown of LT1304CS8#TRPBF?
The low-battery detector in the LT1304CS8#TRPBF remains fully active during shutdown: LBI input continuously monitors battery voltage, and LBO output functions as an open-collector signal that sinks up to 500µA when LBI falls below 1.17V. This autonomous operation occurs with only 10µA total supply current, enabling host systems to detect battery depletion without waking the main regulator - a key feature distinguishing LT1304CS8#TRPBF from alternatives like LT1303.
Can LT1304CS8#TRPBF drive 200mA continuous load at 5V from two AA cells?
Yes, the LT1304CS8#TRPBF is rated for 200mA continuous output at 5V when supplied from two fresh AA cells (≈3.2V). Efficiency exceeds 80% under these conditions (VIN=3.3V, IOUT=200mA), and the internal 1A switch with 370mV VCE(SAT) ensures adequate headroom. For sustained 200mA operation near end-of-life (VIN≈2.0V), efficiency drops to ~70%, but regulation is maintained - verified in Typical Application TA01 and TA05 schematics.
What package type and footprint does LT1304CS8#TRPBF use?
The LT1304CS8#TRPBF uses an 8-lead plastic SOIC (Small Outline Integrated Circuit) package, designated S8 per Linear Technology drawing #05-08-1610. It has 1.27mm lead pitch, 4.9mm × 6.0mm body dimensions, and 1.75mm maximum height. This standard narrow SOIC-8 footprint ensures compatibility with existing pick-and-place equipment, reflow profiles, and PCB layout libraries - identical to industry-standard SOIC packages used for op-amps and logic ICs.
LT1304CS8#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):
- 1.5V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 25V (Switch)
- 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#TRPBF FAQ
1.How can I place an order for LT1304CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1304CS8#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 LT1304CS8#TRPBF reliable?
The price and inventory of LT1304CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1304CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1304CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1304CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1304CS8#TRPBF?
LT1304CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1304CS8#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 LT1304CS8#TRPBF?
For technical support, including LT1304CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1304CS8#TRPBF requirements.
6.How does Aetrix verify that LT1304CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1304CS8#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 LT1304CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1304CS8#TRPBF?
All LT1304CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1304CS8#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 LT1304CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1304CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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