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Analog Devices Inc. LT1304CS8#PBF
- Part No.:
- LT1304CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1304CS8#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 800MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:402
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Product details
Overview
LT1304CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector, designed for battery-powered systems operating from 1.5V to 8V input. It delivers regulated 5V output at up to 200mA, 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 2-cell alkaline to 5V conversion in portable instrumentation.
For engineers reviewing the LT1304CS8#PBF datasheet, LT1304CS8#PBF pinout, LT1304CS8#PBF application, or LT1304CS8#PBF equivalent, key selection criteria include its 1.5V minimum start-up voltage, active low-battery detection during shutdown, programmable peak switch current via ILIM pin, and compatibility with small surface-mount inductors (e.g., Sumida CD54-220) for space-constrained designs.
Technical Context
The LT1304CS8#PBF implements a hysteretic current-mode boost architecture with independent low-battery comparator (A3), enabling continuous monitoring below the main regulator's undervoltage lockout threshold (~1.4V). Its 6µs fixed on-time and 1.5µs off-time timers drive an internal NPN switch, supporting discontinuous conduction mode operation up to 300kHz switching frequency.
Output regulation is achieved via feedback comparison against a 1.24V reference; for the LT1304CS8#PBF variant (fixed 5V output), the SENSE pin connects to an internal resistor divider set to 4.80–5.25V output tolerance. The LBI/LBO pins provide open-collector low-battery signaling with 35–65mV hysteresis and 500µA sink capability, remaining fully functional in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±4.5% (4.80V to 5.25V) - ensures stable logic supply for microcontrollers and sensors without external feedback resistors. |
| Input Voltage Range | 1.5V to 8V - supports single Li-ion (2.7–4.2V), 2–4 alkaline cells (2.0–6.0V), or NiMH stacks without external UVLO circuitry. |
| Quiescent Current | 120µA (active), 10µA (shutdown with LBD active) - enables multi-year battery life in always-on monitoring devices. |
| Peak Switch Current | 1A (ILIM pin floating); programmable down to ~500mA with 22kΩ to GND - allows optimization of inductor size and EMI for specific load profiles. |
| Switch Saturation Voltage | 370mV at 1A - minimizes conduction loss in high-current pulses, improving efficiency at light-to-moderate loads (e.g., 5V/200mA from 2 cells). |
| Low-Battery Threshold | LBI trip at 1.17V ±0.08V with 35–65mV hysteresis - provides reliable end-of-life detection for alkaline batteries before system brownout. |
| Package | 8-lead SO (narrow, 0.150") - industry-standard footprint compatible with automated assembly and thermal relief design rules (θJA = 150°C/W). |
Pinout & Package
LT1304CS8#PBF is housed in an 8-lead plastic SOIC (narrow, 0.150") package with standard lead pitch (1.27mm) and JEDEC MS-012AC outline. Thermal performance is characterized at θJA = 150°C/W with recommended PCB copper area for GND pin (Pin 5) and minimal trace length on SW (Pin 4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI (Pin 1) | Low-battery detector input | Monitors external battery voltage; asserts LBO when <1.17V - requires no external bias, draws only 6–20nA. |
| LBO (Pin 2) | Low-battery detector output | Open-collector output sinking up to 500µA - must be pulled up externally (e.g., 22kΩ to VIN) to generate logic-low alert. |
| VIN (Pin 3) | Main input supply | Accepts 1.5–8V; requires local 1–100µF low-ESR bypass capacitor placed within 0.2" to minimize AC impedance. |
| SW (Pin 4) | Switch collector node | Connects to inductor and Schottky diode anode; high di/dt node - demands short, wide copper trace to reduce RFI and voltage spikes. |
| GND (Pin 5) | Power and signal ground | Low-impedance return path for switch current and feedback - must connect directly to solid ground plane, not daisy-chained. |
| ILIM (Pin 6) | Peak current limit control | Float for 1A limit; tie to GND via resistor (e.g., 22kΩ → 500mA) - also supports soft-start with RC network. |
| SHDN (Pin 7) | Shutdown enable | Logic-high (>1.4V) enables regulation; logic-low (<0.4V) disables switching while preserving LBD function - must not float. |
| SENSE (Pin 8) | Output voltage sense / FB | Internal connection to 5V divider - used for regulation error amplification; disconnected during shutdown to prevent leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Active low-battery detector in shutdown | Enables system-level battery monitoring without waking main regulator - critical for sleep-mode telemetry and medical diagnostics. |
| Programmable peak switch current | Single external resistor from ILIM to GND scales peak current from 1A down to ~500mA, allowing smaller inductors and lower EMI. |
| 1.5V minimum start-up voltage | Permits operation from nearly depleted alkaline cells (e.g., 1.5V/cell × 2 = 3.0V input), extending usable battery capacity by >20% vs. 2.0V-min competitors. |
| 370mV switch VCE(SAT) at 1A | Reduces conduction loss by ~30% versus typical 500mV switches, improving efficiency at 200mA load (e.g., 82% @ 2V→5V, 200mA). |
| 8-lead SOIC package | Standard footprint enables drop-in replacement in legacy designs and simplifies layout verification with established thermal and routing guidelines. |
Applications
| Portable Instrumentation | Bar Code Scanners |
|---|---|
Use Scenario: Handheld multimeter powered by two AA alkaline cells requiring stable 5V for ADC, display, and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary step-up regulator generating 5V/150mA with ultra-low quiescent current to maximize battery life between measurements. Use Value: 10µA shutdown current preserves battery for >5 years in storage; 1.5V start-up ensures full utilization of cell capacity down to 1.5V per cell. | Use Scenario: Battery-powered laser scanner needing 5V for CMOS image sensor and motor driver, with battery level warning before shutdown. IC Role / Device Role / Timing Role: Boost converter with integrated LBO output driving LED indicator or MCU GPIO to signal low battery during scan operation. Use Value: Independent LBD remains active during idle/shutdown, enabling accurate state-of-charge reporting without additional ICs or firmware overhead. |
| Palmtop Computers | Diagnostic Medical Instrumentation |
Use Scenario: Early PDA design using two NiMH cells (2.4V nominal) to power 5V I/O peripherals and flash memory interface. IC Role / Device Role / Timing Role: Micropower DC/DC converter delivering regulated 5V with burst-mode operation to handle transient 200mA CPU loads. Use Value: 120µA active IQ minimizes standby drain; programmable ILIM allows tuning for optimal efficiency across varying CPU activity levels. | Use Scenario: Portable ECG monitor running from two AA cells, requiring precise 5V for analog front-end and low-noise 3.3V (via secondary LDO) for digital processing. IC Role / Device Role / Timing Role: Primary power source enabling long-duration patient monitoring sessions with audible/visual low-battery alerts. Use Value: LBO hysteresis (35–65mV) prevents chatter near trip point; open-collector output interfaces directly with MCU interrupt pin for immediate response. |
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+ | Fixed 5V output; 100µA IQ active; no integrated low-battery detector; requires external shutdown control. | Lacks autonomous LBD functionality - needs external comparator or MCU polling for battery monitoring. | Select when lowest possible active IQ is critical and battery monitoring is handled separately. |
| TPS61040DRVR | Adjustable output (1.8–5.5V); 28µA IQ active; integrated LBO but inactive in shutdown; 28V max SW voltage. | LBO disabled during shutdown - cannot warn of battery depletion while system is off. | Choose for wider input range (0.9–6V) and lower active IQ, but only if LBD-in-shutdown is not required. |
Compared with MAX756CPA+ and TPS61040DRVR, the LT1304CS8#PBF uniquely maintains low-battery detection during shutdown with sub-15µA current draw, making it irreplaceable in applications requiring unattended battery-state awareness over extended storage periods.
Availability
LT1304CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, bar code scanners, and diagnostic medical instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1304CS8#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 product support, datasheet archives, and application engineering resources for legacy Linear parts.
The LT1304 series was designed specifically for micropower, low-voltage battery-operated systems where extended runtime, minimal board space, and autonomous battery health monitoring are essential - targeting portable test equipment and handheld medical devices.
FAQ
What is the minimum input voltage required for LT1304CS8#PBF to start switching?
The LT1304CS8#PBF starts switching at a minimum input voltage of 1.5V, verified across the 0°C to 70°C operating temperature range. This allows reliable operation from two nearly depleted alkaline cells (1.5V each) and distinguishes LT1304CS8#PBF from many competing boost converters with 2.0V or higher start-up thresholds. Below 1.5V, the internal bandgap reference and comparators cease functioning.
Does the low-battery detector in LT1304CS8#PBF remain functional during shutdown mode?
Yes, the low-battery detector (LBD) in LT1304CS8#PBF remains fully active during shutdown mode, drawing only ~10µA total device current. The LBI input continues monitoring battery voltage, and the open-collector LBO output can sink up to 500µA when triggered - enabling real-time battery status reporting even when the main regulator is disabled. This behavior is explicitly confirmed in the LT1304CS8#PBF datasheet Section "Low-Battery Detector".
Can LT1304CS8#PBF be used to generate 3.3V output instead of 5V?
No, LT1304CS8#PBF is a fixed 5V output variant. To obtain 3.3V, use the pin-compatible LT1304CS8-3.3, which has an internal resistor divider calibrated for 3.17–3.43V output. The LT1304CS8#PBF SENSE pin is internally connected to the 5V divider and cannot be reconfigured; attempting external feedback will disrupt regulation and is not supported.
What is the maximum achievable output current from LT1304CS8#PBF at 5V when powered by two 1.5V alkaline cells?
At 5V output with two fresh 1.5V alkaline cells (3.0V input), LT1304CS8#PBF delivers up to 200mA continuously, as validated in the "2-Cell to 5V Step-Up Converter" typical application (Figure TA01). Output current decreases as input voltage drops due to increasing duty cycle requirements and switch conduction losses; at 2.5V input, maximum sustainable output is ~150mA with acceptable efficiency (>75%).
How does the ILIM pin on LT1304CS8#PBF affect peak switch current and efficiency?
The ILIM pin on LT1304CS8#PBF sets peak switch current by offsetting the internal 36mV current-sense threshold. With ILIM floating, peak current is 1A; connecting a 22kΩ resistor to GND reduces it to ~500mA. Lower peak current enables smaller inductors and reduces core loss, but increases conduction time and ripple - resulting in slightly lower efficiency at medium loads (e.g., 100mA) while improving EMI and thermal performance.
LT1304CS8#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:
- 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#PBF FAQ
1.How can I place an order for LT1304CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1304CS8#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#PBF reliable?
The price and inventory of LT1304CS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LT1304CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1304CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1304CS8#PBF?
LT1304CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1304CS8#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#PBF?
For technical support, including LT1304CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1304CS8#PBF requirements.
6.How does Aetrix verify that LT1304CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1304CS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LT1304CS8#PBF?
All LT1304CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1304CS8#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#PBF part is unused and in its original packaging.
Return procedure for LT1304CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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