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Analog Devices Inc. LT1307IS8#PBF
- Part No.:
- LT1307IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1307IS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,560
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Product details
Overview
LT1307IS8#PBF from Analog Devices (formerly Linear Technology) is an industrial-grade, micropower, fixed-frequency 600kHz PWM boost DC/DC converter optimized for single-cell battery operation. It operates from 1V input, delivers up to 75mA at 3.3V output, features automatic Burst Mode™ operation at light loads, and integrates a 200mV low-battery detector with open-collector LBO output. Designed for ultra-low-power portable instrumentation.
For engineers reviewing the LT1307IS8#PBF datasheet, LT1307IS8#PBF pinout, LT1307IS8#PBF application, or LT1307IS8#PBF equivalent, key selection criteria include its 50µA quiescent current (not switching), 295mV switch VCE(SAT) at 500mA, 1.22V feedback reference, and guaranteed operation over –40°C to +85°C in the 8-lead MSOP package.
Technical Context
The LT1307IS8#PBF implements true current-mode PWM control with a 600kHz fixed-frequency oscillator and ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features 35µmhos transconductance and ≥35V/V voltage gain, compensated externally via the VC pin using a series RC network.
Burst Mode™ operation-enabled only in the LT1307 variant-is triggered when load current drops below ~100mA (with 10µH inductor), reducing average quiescent current to 50µA while maintaining regulation. The integrated low-battery detector uses a precision 200mV reference and drives LBO low when LBI falls below threshold, with no hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 5V - enables direct operation from single alkaline/NiMH cells without pre-regulation. |
| Quiescent Current (Not Switching) | 50µA typical - ensures >1-year battery life in always-on glucose meters drawing 100µA system load. |
| Switch VCE(SAT) | 295mV at 500mA - minimizes conduction loss in high-current pulses, critical for pagers and GPS receivers. |
| Feedback Reference Voltage | 1.22V ±20mV - sets precise output voltage via external resistor divider (e.g., 3.3V = 1.22V × (1 + R1/R2)). |
| Switching Frequency | 600kHz ±50kHz - allows use of tiny 10µH surface-mount inductors and 10µF ceramic output capacitors. |
| Low-Battery Threshold | 200mV ±10mV - provides accurate cell-voltage monitoring for battery backup systems with 1MΩ pull-up on LBO. |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded applications including diagnostic medical instrumentation. |
Pinout & Package
LT1307IS8#PBF is housed in an 8-lead MSOP (MS8) package with exposed pad for thermal enhancement. Pin spacing is 0.65mm, body dimensions are 3.0mm × 3.0mm × 0.85mm (max height), and the package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connect external RC (e.g., 100kΩ + 680pF) to ground; controls loop stability and transient response. |
| FB (Pin 2) | Feedback input | Senses output voltage via resistor divider; 1.22V reference enables precise regulation of any output voltage. |
| SHDN (Pin 3) | Enable/disable control | Ground to shut down (IQ ≤ 3µA); tie to VIN or higher to enable; must never be left floating. |
| GND (Pin 4) | Power and signal ground | Primary return path for switch current and analog circuitry; requires low-inductance connection to local ground plane. |
| SW (Pin 5) | Switch node | Connects to inductor and Schottky diode anode; carries high di/dt current-minimize trace area to reduce EMI. |
| VIN (Pin 6) | Input supply | Accepts 1V–5V; requires 1µF ceramic bypass capacitor placed <5mm away to suppress high-frequency noise. |
| LBI (Pin 7) | Low-battery detector input | High-impedance input referenced to 200mV; connect to battery divider to monitor cell voltage. |
| LBO (Pin 8) | Low-battery detector output | Open-collector NPN output; sinks 10µA when LBI < 200mV-requires external 1MΩ pull-up to VOUT or VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell start-up capability | Starts and regulates from 1V input-enables use with partially discharged alkaline or NiMH cells. |
| Automatic Burst Mode™ operation | Reduces average IQ to 50µA at light loads (<100mA), extending battery life without sacrificing regulation accuracy. |
| Integrated low-battery detector | 200mV precision reference with open-collector LBO output eliminates need for external supervisor IC in portable equipment. |
| High-efficiency 600kHz switching | Enables compact designs using 10µH inductors and 10µF ceramic capacitors-no large electrolytics required. |
| Low VCE(SAT) power switch | 295mV drop at 500mA reduces conduction loss by >30% vs. competitive devices, improving efficiency at medium loads. |
Applications
| Pagers | Cordless Telephones |
|---|---|
Use Scenario: Powering RF front-end and baseband logic from a single AA/AAA cell during standby and burst transmission. IC Role / Device Role / Timing Role: Boost converter generating stable 3.3V rail; Burst Mode™ maintains µA-level quiescent draw during long idle periods. Use Value: Extends usable battery life beyond 6 months by minimizing no-load power loss while ensuring fast wake-up response. |
Use Scenario: Supplying 3.3V to digital signal processor and memory in DECT handsets operating from one or two NiMH cells. IC Role / Device Role / Timing Role: Primary DC/DC regulator with integrated low-battery warning; LBO triggers display alert before cell depletion. Use Value: Eliminates discrete supervisor circuitry and reduces BOM count by integrating detection and regulation in one MSOP-8 device. |
| GPS Receivers | Glucose Meters |
Use Scenario: Providing clean, low-noise 3.3V supply to GPS baseband IC and RF frontend during satellite acquisition and tracking. IC Role / Device Role / Timing Role: High-frequency (600kHz) boost converter minimizing EMI near sensitive 1.575GHz L1 band; low VCE(SAT) ensures stable voltage under pulsed 50mA loads. Use Value: Avoids spectral energy at 455kHz IF frequency-measured sidebands at –55dBmVRMS-preserving receiver sensitivity. |
Use Scenario: Powering microcontroller, LCD, and electrochemical sensor interface from a single CR2032 coin cell in handheld medical diagnostics. IC Role / Device Role / Timing Role: Micropower DC/DC converter with 50µA shutdown current and precise 200mV low-battery threshold for end-of-life indication. Use Value: Enables >2000 test cycles per battery by combining ultra-low IQ, accurate voltage monitoring, and robust 1V start-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307CS8#PBF | Commercial grade (0°C to 70°C); identical electrical specs but not rated for industrial temperature range. | Suitable for consumer electronics like cordless phones where ambient temperature stays within 0–70°C. | Select LT1307IS8#PBF for medical or industrial environments requiring –40°C to +85°C operation. |
| LT1307BIS8#PBF | No Burst Mode™; continuous 600kHz switching at all loads; 1mA quiescent current (vs. 50µA). | Preferred where low-frequency output ripple must be eliminated-e.g., noise-sensitive analog front-ends in diagnostic instruments. | Choose LT1307BIS8#PBF when clean output waveform outweighs battery life; otherwise LT1307IS8#PBF maximizes runtime. |
Compared with LT1307CS8#PBF, LT1307IS8#PBF adds guaranteed industrial temperature performance without trade-offs in efficiency or quiescent current; compared with LT1307BIS8#PBF, it trades 1mA static current for 50µA Burst Mode™ savings and accepts low-frequency ripple as the cost of extended battery life.
Availability
LT1307IS8#PBF is available at Aetrix Electronics and suitable for portable electronic equipment, diagnostic medical instrumentation, and battery backup systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1307IS8#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, documentation, and manufacturing continuity for legacy Linear parts including the LT1307 family.
The LT1307 series was designed specifically for micropower, single-cell boost conversion in space-constrained portable devices-emphasizing ultra-low IQ, high light-load efficiency, and integrated battery monitoring.
FAQ
What is the minimum input voltage required for LT1307IS8#PBF to start switching?
The LT1307IS8#PBF starts switching at a minimum input voltage of 1.0V (guaranteed over –40°C to +85°C). At 25°C, startup occurs as low as 0.92V. This enables reliable operation from nearly depleted alkaline or NiMH cells, making LT1307IS8#PBF ideal for long-life battery-powered applications such as glucose meters and remote sensors.
Does LT1307IS8#PBF support adjustable output voltage, and how is it set?
Yes, LT1307IS8#PBF supports fully adjustable output voltage via the FB pin. The internal 1.22V reference connects to an external resistor divider between VOUT and GND. Output voltage is calculated as VOUT = 1.22V × (1 + R1/R2), where R2 connects from FB to GND and R1 from VOUT to FB. For example, 3.3V output uses R1 = 1.02MΩ and R2 = 604kΩ (1%).
How does the low-battery detector in LT1307IS8#PBF function, and what external components are needed?
The LT1307IS8#PBF low-battery detector compares LBI voltage to an internal 200mV reference. When LBI falls below threshold, LBO pulls low (≤0.25V @ 10µA sink). No external components are required for basic operation-only a resistive divider from battery to LBI and a 1MΩ pull-up from LBO to VOUT or VIN. LBI bias current is ≤30nA, minimizing divider loading.
Can LT1307IS8#PBF be used with ceramic output capacitors only, and what is the minimum value?
Yes, LT1307IS8#PBF is explicitly designed for ceramic-only output capacitance. The datasheet confirms stable operation with just 10µF of X5R/X7R ceramic capacitor (e.g., Murata GRM235Y5V106Z01). Unlike older boost controllers, it does not require bulk electrolytic capacitance due to its 600kHz switching frequency and current-mode architecture.
What is the purpose of the VC pin on LT1307IS8#PBF, and how is it configured?
The VC pin on LT1307IS8#PBF is the error amplifier output and compensation node. It requires an external series RC network (e.g., 100kΩ + 680pF) connected to GND to stabilize the control loop. This network sets dominant pole location, directly affecting transient response and phase margin. Layout best practice mandates minimal trace area at VC to avoid noise coupling and ensure consistent regulation.
LT1307IS8#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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 600mA (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1307IS8#PBF FAQ
1.How can I place an order for LT1307IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307IS8#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 LT1307IS8#PBF reliable?
The price and inventory of LT1307IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1307IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307IS8#PBF?
LT1307IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307IS8#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 LT1307IS8#PBF?
For technical support, including LT1307IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307IS8#PBF requirements.
6.How does Aetrix verify that LT1307IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1307IS8#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 LT1307IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1307IS8#PBF?
All LT1307IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307IS8#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 LT1307IS8#PBF part is unused and in its original packaging.
Return procedure for LT1307IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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