My Inquiry
My Account
Analog Devices Inc. LT1304CS8-3.3#PBF
- Part No.:
- LT1304CS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1304CS8-3.3#PBF.pdf
- Description:
- IC REG BST SEPIC 3.3V 800MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,156
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1304CS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector, designed for 2–4-cell battery systems requiring regulated 3.3V output. It operates from 1.5V to 8V input, delivers up to 300mA load current, maintains 10µA shutdown quiescent current with active battery monitoring, and uses an internal 1A switch with 370mV saturation voltage at 1A - enabling compact portable instrumentation and barcode scanners.
For engineers reviewing the LT1304CS8-3.3#PBF datasheet, LT1304CS8-3.3#PBF pinout, LT1304CS8-3.3#PBF application, or LT1304CS8-3.3#PBF equivalent, key selection criteria include its fixed 3.3V output accuracy (±3.9%), active-low battery detect threshold (1.17V), 300kHz switching frequency, SO-8 package thermal resistance (θJA = 150°C/W), and ability to sustain operation down to 1.5V input - critical for ultra-low-voltage battery-powered designs.
Technical Context
The LT1304CS8-3.3#PBF implements a hysteretic current-mode boost architecture with independent low-battery comparator A3 that remains fully functional in shutdown mode. Its 6µs fixed on-time and 1.5µs off-time timers drive an internal NPN power switch, while feedback is taken directly from the SENSE pin tied to an internal 3.3V reference divider.
Output regulation is achieved by comparing SENSE voltage against a trimmed 1.24V bandgap reference; the low-battery detector uses a separate 1.17V reference with 35mV hysteresis and open-collector LBO output capable of sinking 500µA. The ILIM pin allows peak switch current reduction via external resistor, supporting soft-start and lower-power component selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.9% (3.17V to 3.43V) - ensures stable logic supply for 3.3V microcontrollers and peripherals without external feedback resistors. |
| Input Voltage Range | 1.5V to 8V - supports operation from single Li-ion down to two alkaline cells, including brown-out recovery below typical LDO dropout. |
| Quiescent Current | 120µA active / 10µA shutdown - enables multi-year battery life in always-on sensor nodes and handheld devices. |
| Switch Saturation Voltage | 370mV at 1A - minimizes conduction loss in high-current pulses, improving efficiency at medium loads (e.g., 200mA @ 2.5VIN → 3.3V). |
| Low-Battery Threshold | 1.17V (falling edge) with 35mV hysteresis - provides clean, chatter-free battery warning signal even during transient load dips. |
| Switching Frequency | Up to 300kHz - permits use of small surface-mount inductors (e.g., 22µH Sumida CD54-220) and reduces EMI compared to sub-100kHz converters. |
| Package Thermal Resistance | θJA = 150°C/W (SO-8) - limits junction temperature rise to ≤75°C at 500mW dissipation in still air, supporting continuous 300mA output at 25°C ambient. |
Pinout & Package
LT1304CS8-3.3#PBF is housed in an 8-lead plastic SO (narrow, 0.150") package per LTC DWG #05-08-1610, with exposed pad not connected internally. Standard SO-8 footprint enables compatibility with automated assembly and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI (Pin 1) | Low-battery detector input | Monitors external battery voltage; asserts LBO when voltage falls below 1.17V - remains active in shutdown for system-level battery management. |
| LBO (Pin 2) | Low-battery detector open-collector output | Sinks up to 500µA; requires external pull-up; signals battery depletion independently of regulator state. |
| VIN (Pin 3) | Main input supply | Accepts 1.5V–8V; must be bypassed within 0.2" using ≥100µF low-ESR capacitor to handle 1A pulsed current and prevent rail collapse. |
| SW (Pin 4) | Internal NPN switch collector | Drives external inductor; requires short, low-inductance PCB trace to minimize RFI and switching losses. |
| GND (Pin 5) | Power and signal ground | Must connect directly to low-impedance ground plane; separates analog reference and power return paths. |
| ILIM (Pin 6) | Peak switch current limit set | Floating = 1A max; resistor to GND scales peak current linearly (e.g., 22kΩ → ~500mA) for soft-start or smaller magnetics. |
| SHDN (Pin 7) | Active-low shutdown control | Pull low to disable switching (IQ = 10µA); must not float - tie to VIN if unused to ensure full operation. |
| SENSE (Pin 8) | Output voltage sense / feedback | Internally connected to 3.3V divider; monitors regulated output; disconnected during shutdown to prevent loading. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower shutdown with live battery monitor | 10µA IQ while LBO remains fully functional - enables host MCU to wake on low-battery interrupt without draining cell during sleep. |
| Ultra-low minimum input voltage | 1.5V start-up and operation - extends usable battery capacity beyond conventional 1.8V DC/DC limits, especially with alkaline or NiMH cells. |
| Integrated low-battery hysteresis | 35mV built-in hysteresis on LBI input - eliminates output oscillation near trip point, eliminating need for external RC filtering. |
| Programmable peak switch current | Single resistor from ILIM to GND adjusts peak current from 1A down to ~500mA - allows optimization of inductor size, cost, and efficiency trade-offs. |
| High-efficiency boost topology | Typical 85% efficiency at 200mA (2.5V→3.3V) - achieved via low VCE(SAT), optimized timing, and minimal bias current in active mode. |
Applications
| Portable Barcode Scanners | Palmtop Computers |
|---|---|
Use Scenario: Powering CMOS image sensors and laser diodes from two AA alkaline cells in handheld scanning units. IC Role / Device Role / Timing Role: Step-up converter generating stable 3.3V rail for sensor interface and microcontroller core, with LBO signaling end-of-life before data corruption occurs. Use Value: Enables >1000 scans per battery set by maintaining regulation down to 1.5V input and minimizing quiescent drain during idle periods. |
Use Scenario: Supplying 3.3V logic and memory rails in clamshell-form-factor PDAs with dual-cell primary battery packs. IC Role / Device Role / Timing Role: Primary DC/DC regulator with integrated battery health monitoring, feeding PMIC and real-time clock subsystems. Use Value: Eliminates need for discrete low-battery comparator and saves board space via SO-8 integration - critical in <100mm² PCB footprints. |
| Diagnostic Medical Instruments | Personal Data Communicators |
Use Scenario: Powering precision ADCs, op-amps, and wireless transceivers in battery-operated glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Clean, low-noise 3.3V supply generator with burst-mode capability; LBO triggers calibration alert before measurement inaccuracy arises. Use Value: Meets IEC 60601 leakage and reliability requirements via 125°C-rated SO-8 package and guaranteed 1.5V operation across temperature. |
Use Scenario: Providing regulated 3.3V for RF front-end, baseband processor, and display driver in early-generation PDCs (e.g., PalmPilot). IC Role / Device Role / Timing Role: Main system power IC with programmable current limit to match varying transmit/receive load profiles. Use Value: Supports dynamic power scaling - ILIM resistor adjusts peak current to match GSM burst transmission demands without overdesigning magnetics. |
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 |
|---|---|---|---|
| LT1304CS8-5#PBF | Fixed 5V output (±4.5%), identical pinout and quiescent current, but higher output voltage tolerance and different SENSE reference. | Used where 5V logic or USB-peripheral interfacing is required instead of 3.3V; not interchangeable without circuit redesign. | Select only if system requires 5V - output voltage mismatch prevents drop-in replacement. |
| MAX630ESA+ | Similar micropower boost (1.5V–6.5V IN, 3.3V OUT), but 15µA shutdown IQ, no integrated low-battery detector, and SO-8 package with different pin mapping (no LBI/LBO pins). | Requires external battery monitor circuit; suitable for cost-sensitive designs where battery alerting is handled elsewhere. | Choose when LBO functionality is unnecessary and board layout allows pinout adaptation. |
Compared with LT1304CS8-3.3#PBF, the LT1304CS8-5#PBF offers identical form-factor and efficiency but targets 5V systems, while the MAX630ESA+ trades integrated battery detection for slightly lower shutdown current and reduced BOM count - making it viable only when external supervision is already present.
Availability
LT1304CS8-3.3#PBF is available at Aetrix Electronics and suitable for portable instrumentation, diagnostic medical devices, and personal data communicators requiring stable component supply with long-term lifecycle support.
Supply support for LT1304CS8-3.3#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. Linear was founded in 1981 and specialized in high-performance analog ICs.
The LT1304 series belongs to Linear's micropower DC/DC converter product line, engineered specifically for ultra-low-voltage battery-powered systems where extended runtime, reliable low-battery indication, and minimal PCB area are design priorities.
FAQ
What is the output voltage tolerance of the LT1304CS8-3.3#PBF over temperature and load?
The LT1304CS8-3.3#PBF guarantees a 3.3V output within ±3.9% (3.17V to 3.43V) over the full 0°C to 70°C operating range and for load currents up to 300mA. This tolerance includes initial accuracy, line regulation (0.15%/V), and load regulation effects - verified per the manufacturer's electrical characteristics table under "Output Sense Voltage".
Can the LT1304CS8-3.3#PBF operate from a single Li-ion cell?
Yes, the LT1304CS8-3.3#PBF operates from inputs as low as 1.5V, well below the 2.7V–3.0V minimum of most Li-ion cells under load. However, sustained operation below 2.7V risks deep discharge; best practice is to pair it with the LBI/LBO pins to disconnect or alert before reaching unsafe cell voltages - as shown in Typical Application TA11.
How does the low-battery detector behave during shutdown of the LT1304CS8-3.3#PBF?
The low-battery detector in the LT1304CS8-3.3#PBF remains fully active during shutdown: LBI continues sampling battery voltage, and LBO asserts low when LBI falls below 1.17V - all while total device current stays at just 10µA. This allows host systems to monitor battery health without waking the main regulator.
What is the maximum recommended output current for the LT1304CS8-3.3#PBF at 25°C ambient?
At 25°C ambient with standard SO-8 PCB layout (2-layer, 1 oz copper, 1 in² copper pour), the LT1304CS8-3.3#PBF supports up to 300mA continuous output current while maintaining thermal safety. This assumes 2.5V input → 3.3V output, 22µH inductor, and proper input/output capacitance - per Typical Application TA05 and thermal derating curves.
Is the LT1304CS8-3.3#PBF RoHS compliant and lead-free?
Yes, the LT1304CS8-3.3#PBF carries the #PBF suffix, indicating it is lead-free and RoHS compliant per EU Directive 2011/65/EU. The package uses matte tin lead finish, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) for standard SMT assembly.
LT1304CS8-3.3#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):
- 3.3V
- 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
LT1304CS8-3.3#PBF FAQ
1.How can I place an order for LT1304CS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1304CS8-3.3#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 LT1304CS8-3.3#PBF reliable?
The price and inventory of LT1304CS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1304CS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT1304CS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1304CS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1304CS8-3.3#PBF?
LT1304CS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1304CS8-3.3#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 LT1304CS8-3.3#PBF?
For technical support, including LT1304CS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1304CS8-3.3#PBF requirements.
6.How does Aetrix verify that LT1304CS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT1304CS8-3.3#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 LT1304CS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT1304CS8-3.3#PBF?
All LT1304CS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1304CS8-3.3#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 LT1304CS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LT1304CS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1304CS8-3.3#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…
