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Analog Devices Inc. LT1307IS8#TRPBF
- Part No.:
- LT1307IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1307IS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,278
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Product details
Overview
LT1307IS8#TRPBF from Analog Devices (formerly Linear Technology) is an industrial-grade, micropower, fixed-frequency 600kHz PWM boost DC/DC converter optimized for single-cell alkaline or NiMH battery operation. It delivers up to 75mA at 3.3V from 1.0V input, features automatic Burst Mode™ operation for light-load efficiency, integrates a 500mA NPN switch with 295mV VCE(SAT), and includes a 200mV low-battery detector. It is used in portable medical diagnostics and GPS receivers requiring ultra-low quiescent current.
For engineers reviewing the LT1307IS8#TRPBF datasheet, LT1307IS8#TRPBF pinout, LT1307IS8#TRPBF application, or LT1307IS8#TRPBF equivalent, key selection criteria include its 50µA no-load quiescent current, 1V minimum input voltage, 600kHz switching frequency enabling ceramic capacitor use, and industrial temperature range (–40°C to +85°C) support for battery-powered instrumentation.
Technical Context
The LT1307IS8#TRPBF implements current-mode PWM control with a 600kHz oscillator and internal ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (transconductance = 25–65 µmhos, gain = 30–100 V/V) drives a VC-compensation node requiring external RC network (e.g., 100kΩ/680pF) for loop stability.
Burst Mode™ operation-enabled only in LT1307 variants-is triggered when load current drops below ~50–100mA (depending on inductor value), reducing average supply current to 50µA while maintaining regulation via periodic switching bursts. The LT1307IS8#TRPBF variant supports this mode and is rated for industrial temperature operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.0V to 5.0V - enables direct operation from single-cell batteries without pre-regulation |
| Switching Frequency | 500–750kHz (typ. 600kHz) - allows use of small 10µH inductors and 10µF ceramic output capacitors |
| Quiescent Current | 50µA (not switching, TA = –40°C to +85°C) - extends battery life in standby or intermittent-use devices |
| Feedback Voltage | 1.195V to 1.245V (industrial temp) - sets regulated output via external resistor divider (e.g., 3.3V = 1.22V × (1 + R1/R2)) |
| Switch VCE(SAT) | 250–400mV at 500mA (–40°C to +85°C) - minimizes conduction loss in high-efficiency boost topologies |
| Low-Battery Threshold | 186–210mV on LBI pin - provides accurate battery depletion detection with 1MΩ load gain of 1000–6000 V/V |
| Shutdown Current | 1–3µA (industrial temp) - ensures near-zero power draw during system sleep states |
Pinout & Package
LT1307IS8#TRPBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch), thermally enhanced for industrial ambient operation. Pin 1 (VC) is the error amplifier compensation node; Pin 2 (FB) senses output voltage; Pin 3 (SHDN) enables/disables switching; Pin 4 (GND) is the power ground reference; Pin 5 (SW) connects to inductor/diode; Pin 6 (VIN) accepts 1V–5V input; Pin 7 (LBI) inputs low-battery sense signal; Pin 8 (LBO) outputs open-collector low-battery alert.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Requires external RC network (e.g., 100kΩ + 680pF) to stabilize feedback loop; trace area must be minimized |
| FB (Pin 2) | Feedback input | Connects to resistor divider tap; 1.22V reference enables precise output voltage setting (e.g., 3.3V or 5V) |
| SHDN (Pin 3) | Enable/disable control | Must be tied ≥ VIN to operate; grounded to shut down; floating causes erratic behavior |
| GND (Pin 4) | Power ground | Direct connection to local ground plane required; forms return path for SW, VIN, and LBO currents |
| SW (Pin 5) | Switch node | Drives external inductor/diode; high di/dt demands short, low-inductance routing to minimize EMI |
| VIN (Pin 6) | Main power input | Requires 1µF ceramic bypass capacitor placed ≤5mm away; supports 1V start-up and reverse-battery tolerance |
| LBI (Pin 7) | Low-battery detector input | Accepts 0–700mV signal; 200mV threshold triggers LBO; bias current flows out (5–30nA, –40°C to +85°C) |
| LBO (Pin 8) | Low-battery detector output | Open-collector NPN output sinking ≤10µA; requires 1MΩ pull-up to set logic-high level |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell 1V start-up capability | Enables direct operation from depleted alkaline/NiMH cells without auxiliary boost or charge-pump circuitry |
| 50µA quiescent current (industrial grade) | Extends battery runtime in glucose meters and diagnostic instruments operating intermittently over weeks/months |
| 600kHz fixed-frequency PWM + Burst Mode™ | Maintains >80% efficiency from 100µA to 100mA load while avoiding audible noise and simplifying EMI filtering |
| Integrated 500mA NPN switch with 295mV VCE(SAT) | Eliminates need for external power transistor; reduces BOM count and PCB area in space-constrained portable designs |
| On-chip 200mV low-battery detector | Provides reliable end-of-life indication without external comparators or references, saving board space and calibration effort |
| MSOP-8 industrial package (–40°C to +85°C) | Offers thermal performance (θJA = 160°C/W) suitable for sealed enclosures in medical or outdoor portable equipment |
Applications
| Glucose Monitoring Systems | Portable GPS Receivers |
|---|---|
Use Scenario: Battery-powered handheld glucose meter operating from single AA alkaline cell with intermittent 5-second measurement cycles. IC Role / Device Role / Timing Role: Primary 3.3V system rail generator; regulates output during brief high-current sensor excitation pulses (≤75mA). Use Value: 50µA quiescent current extends battery life beyond 6 months; 1V start-up ensures full utilization of cell capacity down to 0.92V. |
Use Scenario: Compact GPS module in asset tracker requiring stable 3.3V supply under varying RF load and cold-temperature conditions. IC Role / Device Role / Timing Role: Boost converter supplying GPS baseband IC and RF front-end; operates continuously during satellite acquisition. Use Value: Industrial temperature rating (–40°C to +85°C) guarantees startup at freezing temperatures; 600kHz switching avoids interference with GPS L1 band (1.575GHz). |
| Handheld Diagnostic Instruments | Wireless Pagers (Legacy) |
Use Scenario: Portable ECG or pulse oximeter using NiMH battery pack with deep discharge protection requirements. IC Role / Device Role / Timing Role: System power manager providing regulated 3.3V and enabling low-battery shutdown via LBO signal to microcontroller. Use Value: Integrated 200mV LBI/LBO circuit eliminates discrete comparator, reducing component count and calibration drift over temperature. |
Use Scenario: Two-way pager receiving burst data over FLEX protocol, requiring fast transient response and minimal standby drain. IC Role / Device Role / Timing Role: Main supply regulator delivering 3.3V to baseband ASIC and display driver during receive windows. Use Value: Burst Mode™ operation maintains 85% efficiency at 100µA idle current, enabling multi-week standby on single AAA cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307BIS8#TRPBF | 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., sensitive analog front-ends), accepting reduced light-load efficiency | Select LT1307BIS8#TRPBF if clean 3.3V rail is critical and battery life at microamp loads is secondary |
| MAX756CSA+ | Fixed 5V output (non-adjustable); 100µA quiescent current; 500kHz switching; no low-battery detector | Suitable for legacy 5V-only systems; lacks programmable output and battery monitoring features | Choose MAX756CSA+ only for cost-sensitive, fixed-output applications where LBI/LBO functionality is unnecessary |
Compared with LT1307BIS8#TRPBF, the LT1307IS8#TRPBF trades higher light-load efficiency for Burst Mode™ ripple; compared with MAX756CSA+, it offers adjustable output voltage and integrated battery monitoring-critical for modern portable medical and navigation devices.
Availability
LT1307IS8#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable GPS receivers, handheld diagnostic instruments, and wireless pagers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1307IS8#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 technical and manufacturing continuity for the LT product line, renowned for precision analog and power management ICs.
The LT1307 series was designed specifically for ultra-low-power, single-cell boost conversion in portable medical, instrumentation, and communications equipment-emphasizing micropower operation, wide input range, and integrated system-level functions like battery monitoring.
FAQ
What is the minimum input voltage required for LT1307IS8#TRPBF to start switching?
The LT1307IS8#TRPBF guarantees start-up at 0.92V (–40°C) and 1.0V (25°C). At room temperature, it reliably begins regulation from a single alkaline cell down to ~0.95V. This 1V minimum input enables full utilization of battery capacity before shutdown, a key requirement in glucose meters and diagnostic tools where battery replacement intervals must be maximized.
Does LT1307IS8#TRPBF support adjustable output voltage, and how is it configured?
Yes, LT1307IS8#TRPBF supports fully adjustable output voltage via external resistor divider on the FB pin. The internal 1.22V reference sets VOUT = 1.22V × (1 + R1/R2). For example, a 3.3V output uses R1 = 1.02MΩ and R2 = 604kΩ (1%). The LT1307IS8#TRPBF datasheet provides standard configurations for 3.3V and 5V outputs, and the feedback network tolerances directly impact output accuracy.
How does the Burst Mode™ operation in LT1307IS8#TRPBF improve efficiency at light loads?
Burst Mode™ in LT1307IS8#TRPBF reduces average supply current to 50µA by disabling the entire switching circuit except the error amplifier and low-battery detector between regulation bursts. This eliminates switching losses during idle periods while maintaining output regulation. As a result, LT1307IS8#TRPBF sustains >80% efficiency even at 100µA load-critical for battery-powered devices with long standby durations.
What is the purpose of the LBI and LBO pins on LT1307IS8#TRPBF, and how are they used?
The LBI (Low-Battery Input) pin accepts a scaled battery voltage; when it falls below 200mV (186–210mV over temperature), the open-collector LBO (Low-Battery Output) pulls low. A 1MΩ pull-up on LBO generates a logic signal for the host microcontroller. In LT1307IS8#TRPBF, this integrated detector replaces discrete comparators, reducing BOM count and eliminating external reference drift-especially valuable in field-deployed diagnostic instruments.
Can LT1307IS8#TRPBF drive a 100mA load at 3.3V from a 1.2V input?
No. LT1307IS8#TRPBF is specified for up to 75mA at 3.3V from a 1.5V input, and derates with lower input voltage. At 1.2V input, maximum sustainable output current is ~50mA due to duty-cycle limitation (max 84%) and switch VCE(SAT) rise. Exceeding this risks regulation loss or thermal overload. For 100mA applications, consider higher-input architectures or alternative converters like LT3467.
LT1307IS8#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
- 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#TRPBF FAQ
1.How can I place an order for LT1307IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307IS8#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 LT1307IS8#TRPBF reliable?
The price and inventory of LT1307IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1307IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307IS8#TRPBF?
LT1307IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307IS8#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 LT1307IS8#TRPBF?
For technical support, including LT1307IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307IS8#TRPBF requirements.
6.How does Aetrix verify that LT1307IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1307IS8#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 LT1307IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1307IS8#TRPBF?
All LT1307IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307IS8#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 LT1307IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1307IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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