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Analog Devices Inc. LT1304CS8-5#TRPBF
- Part No.:
- LT1304CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1304CS8-5#TRPBF.pdf
- Description:
- IC REG BST SEPIC 5V 800MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1304CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector, designed for 2-cell alkaline/NiCd 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 in an 8-lead SO package.
For engineers reviewing the LT1304CS8-5#TRPBF datasheet, LT1304CS8-5#TRPBF pinout, LT1304CS8-5#TRPBF application, or LT1304CS8-5#TRPBF equivalent, key selection criteria include its 5V fixed output accuracy (±4.5%), 1.5V minimum start-up voltage, active low-battery detection during shutdown, programmable peak switch current via ILIM, and suitability for portable instrumentation and barcode scanners requiring ultra-low IQ operation.
Technical Context
The LT1304CS8-5#TRPBF implements a hysteretic current-mode boost topology with independent low-battery comparator A3 that remains powered in shutdown. Its 6µs fixed ON-time and 1.5µs OFF-time timers drive an internal NPN switch, enabling up to 300kHz switching without external clock.
Output regulation is achieved by sensing voltage at the SENSE (FB) pin against a 1.24V reference; the low-battery detector compares LBI input to a 1.17V threshold with 35mV hysteresis and drives open-collector LBO. The ILIM pin allows resistor-programmable peak switch current from 500mA to 1A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V typical (4.80–5.25V range), enabling direct replacement of 5V logic rails without external feedback resistors. |
| Input Voltage Range | 1.5V to 8V min/max, supporting operation down to near-dead 2-cell alkaline batteries (≈1.5V/cell). |
| Quiescent Current | 120µA in active mode; 10µA in shutdown with low-battery detector fully functional - critical for long-term battery life. |
| Peak Switch Current | 1A default (reducible to 500mA with 22kΩ ILIM-to-GND resistor), defining maximum inductor and diode stress. |
| Switch Saturation Voltage | 370mV typical at 1A, directly limiting conduction loss and thermal rise in high-current boost stages. |
| Low-Battery Threshold | 1.17V nominal on LBI pin with 35mV hysteresis, allowing precise end-of-life battery detection without system-level polling. |
| Package | 8-lead SOIC (S8), 0.150" wide, compatible with standard surface-mount assembly and PCB layout practices. |
Pinout & Package
LT1304CS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package per LTC DWG #05-08-1610, with 1.27mm pitch, 3.9mm body width, and 4.9mm length. Pin 1 is marked with a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI (Pin 1) | Low-battery detector input | Connects to battery divider; asserts LBO when voltage falls below 1.17V - remains active in shutdown. |
| LBO (Pin 2) | Low-battery detector output | Open-collector output sinking up to 500µA; requires external pull-up for logic-level signaling. |
| VIN (Pin 3) | Main input supply | Accepts 1.5–8V; must be bypassed within 0.2" using ≥1µF ceramic capacitor to suppress switching noise. |
| SW (Pin 4) | Switch collector node | Drives external inductor; requires short, low-inductance trace to minimize RFI and voltage spikes. |
| GND (Pin 5) | Power and signal ground | Must connect directly to low-impedance ground plane; shared return for VIN, SW, and load paths. |
| ILIM (Pin 6) | Peak current limit set | Floating = 1A max; resistor to GND scales peak current linearly (e.g., 22kΩ → ~500mA). |
| SHDN (Pin 7) | Shutdown control | Logic-high (>1.4V) enables regulator; logic-low (<0.4V) disables switching while preserving LBO function. |
| SENSE/FB (Pin 8) | Output voltage sense | Internally connected to 5V feedback divider; disconnected during shutdown to prevent leakage path. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower shutdown with active battery monitor | 10µA total supply current while LBO remains fully operational - enables "set-and-forget" battery status reporting. |
| Ultra-low start-up voltage | Operates with VIN as low as 1.5V - extends usable battery life beyond conventional 1.8V boost ICs. |
| Integrated low-VCE(sat) NPN switch | 370mV saturation voltage at 1A reduces conduction loss and thermal load in compact layouts. |
| Programmable peak switch current | Single resistor from ILIM to GND adjusts peak current from 500mA to 1A - optimizes inductor/diode selection per load. |
| Hysteretic comparator-based regulation | No external compensation required; stable operation across temperature and line/load variations without loop stability analysis. |
Applications
| Portable Medical Diagnostics | Barcode Scanners |
|---|---|
Use Scenario: Handheld glucose meters or pulse oximeters powered by two AA alkaline cells requiring stable 5V for microcontroller, display, and sensor interface. IC Role / Device Role / Timing Role: Primary 2-cell-to-5V boost converter with integrated low-battery warning to trigger user alerts before power failure. Use Value: 10µA shutdown IQ preserves battery shelf life; 1.5V start-up ensures full utilization of cell capacity; LBO output directly drives LED or MCU GPIO. | Use Scenario: Battery-powered laser barcode scanner needing 5V for CMOS image sensor and decoding ASIC, operating intermittently with long standby periods. IC Role / Device Role / Timing Role: Micropower step-up regulator enabling >100-hour battery life; SHDN pin controlled by MCU to disable converter between scans. Use Value: 120µA active IQ minimizes idle drain; programmable ILIM allows smaller inductor (e.g., CD43-100) for compact form factor; LBO prevents data corruption during brownout. |
| Palm-Sized Data Communicators | Low-Power Industrial Sensors |
Use Scenario: Legacy PDAs or RFID handhelds using two NiCd cells (2.4V nominal) to generate clean 5V for RS-232 transceivers and flash memory. IC Role / Device Role / Timing Role: Fixed-output boost stage with SENSE pin tied to internal 5V divider; LBI monitors battery via simple resistor network. Use Value: ±4.5% output tolerance meets RS-232 driver requirements; 300kHz switching permits <22µH inductors; SOIC package supports automated assembly. | Use Scenario: Wireless sensor nodes powered by two primary lithium cells (3V nominal) requiring 5V for RF transceiver burst transmission. IC Role / Device Role / Timing Role: High-efficiency boost converter activated only during TX bursts; LBO signals battery depletion to gateway before communication failure. Use Value: 80%+ efficiency at 100mA load conserves energy; 1.5µs OFF-time enables fast transient response to burst loads; ILIM tuning matches peak current to RF PA requirements. |
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+ | 5V fixed output; 100µA IQ active; no integrated low-battery detector; requires external feedback for adjustable versions. | Lacks autonomous battery monitoring - requires MCU polling or external comparator for low-VBAT alert. | Choose when lowest possible active IQ is critical and battery monitoring is handled externally. |
| TPS61200DRCR | 5V fixed output; 5.5µA IQ shutdown; integrated soft-start; no dedicated LBO pin - status reported via FLAG pin. | FLAG pin provides digital fault/status but lacks true open-collector LBO for direct LED driving or wired-OR logic. | Prefer when ultra-low shutdown IQ and integrated soft-start outweigh need for analog LBO output. |
Compared with MAX756CPA+ and TPS61200DRCR, the LT1304CS8-5#TRPBF uniquely combines micropower shutdown *with* always-on open-collector LBO, making it optimal for systems where battery state must be monitored continuously without MCU intervention or additional components.
Availability
LT1304CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable medical diagnostics, barcode scanners, palm-sized data communicators, and low-power industrial sensors requiring stable component supply and long battery service life.
Supply support for LT1304CS8-5#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 its legacy precision analog and power management portfolio. Linear was founded in 1981 and pioneered high-performance DC/DC converters for battery-powered systems.
The LT1304 family was designed specifically for ultra-low-power, single- or dual-cell battery applications demanding both regulated output and autonomous battery health monitoring - targeting portable instrumentation and handheld electronics.
FAQ
What is the guaranteed minimum input voltage for LT1304CS8-5#TRPBF to start switching?
The LT1304CS8-5#TRPBF is specified to begin regulation with VIN as low as 1.5V, and its absolute minimum operating voltage is 1.65V. This allows reliable startup from nearly depleted 2-cell alkaline batteries, extending usable battery life beyond most competing boost converters that require ≥1.8V.
Does LT1304CS8-5#TRPBF require external feedback resistors to regulate at 5V?
No. The LT1304CS8-5#TRPBF is a fixed-output variant with internal resistor divider connected to the SENSE/FB pin, delivering 5.05V typical (4.80–5.25V). External resistors are unnecessary - unlike the adjustable LT1304, which requires external FB network.
How does the low-battery detector behave when LT1304CS8-5#TRPBF is in shutdown mode?
The low-battery detector remains fully active during shutdown: LBI continues monitoring input voltage, and LBO outputs open-collector low when LBI falls below 1.17V. This enables continuous battery status reporting without waking the main converter - a key feature distinguishing LT1304CS8-5#TRPBF from alternatives like LT1303.
Can LT1304CS8-5#TRPBF deliver 200mA output current continuously?
Yes - the LT1304CS8-5#TRPBF is rated for 200mA output at 5V when VIN ≥ 2.5V and ambient temperature ≤ 70°C. At lower input voltages (e.g., 1.8V), output current capability decreases due to duty-cycle and switch-current limits; refer to efficiency curves in Figure TA02 for derating guidance.
What is the purpose of the ILIM pin on LT1304CS8-5#TRPBF, and how is it used?
The ILIM pin on LT1304CS8-5#TRPBF sets peak switch current: floating = 1A; connecting a resistor to GND reduces peak current linearly (e.g., 22kΩ → ~500mA). This allows optimization of inductor size, diode rating, and efficiency for specific load profiles without changing the IC.
LT1304CS8-5#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:
- 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#TRPBF FAQ
1.How can I place an order for LT1304CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1304CS8-5#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 LT1304CS8-5#TRPBF reliable?
The price and inventory of LT1304CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1304CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1304CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1304CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1304CS8-5#TRPBF?
LT1304CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1304CS8-5#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 LT1304CS8-5#TRPBF?
For technical support, including LT1304CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1304CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1304CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1304CS8-5#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 LT1304CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1304CS8-5#TRPBF?
All LT1304CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1304CS8-5#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 LT1304CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1304CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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