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Analog Devices Inc. LT1307CS8#TRPBF
- Part No.:
- LT1307CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1307CS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
LT1307CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz PWM boost DC/DC converter optimized for single-cell battery operation down to 1V input. It integrates an NPN power switch with 295mV VCE(SAT) at 500mA, delivers up to 75mA at 3.3V output, and features automatic Burst Mode™ operation for high light-load efficiency. It is used in portable medical devices like glucose meters and low-power GPS receivers.
For engineers reviewing the LT1307CS8#TRPBF datasheet, LT1307CS8#TRPBF pinout, LT1307CS8#TRPBF application, or LT1307CS8#TRPBF equivalent, key selection criteria include its 1V minimum input voltage, 50µA quiescent current (non-switching), 1.22V feedback reference, integrated low-battery detector (200mV threshold), and MSOP-8 package compatibility with ceramic capacitor-based designs.
Technical Context
The LT1307CS8#TRPBF employs current-mode PWM control with a 600kHz fixed-frequency oscillator and ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (transconductance = 25–65 µmhos, gain = 35–100 V/V) drives an internal NPN switch via a driver stage, while the VC pin enables external RC compensation for loop stability.
Burst Mode™ operation-enabled only in the LT1307 (not LT1307B variant)-reduces average quiescent current to 50µA at light loads (<100mA) by gating full switching cycles, introducing low-frequency ripple but preserving >80% efficiency down to 100µA load. The low-battery detector uses a precision 200mV reference and open-collector LBO output with 0.1–0.25V sink capability at 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 5V - supports direct operation from single alkaline/NiMH cells without pre-regulation |
| Switching Frequency | 550–750 kHz (typ. 600 kHz) - enables use of small 10µH inductors and 1–10µF ceramic capacitors |
| Feedback Reference Voltage | 1.22 V (±20 mV) - sets regulated output as VOUT = 1.22 × (1 + R1/R2); stable over –40°C to 85°C |
| Quiescent Current | 50 µA (non-switching, TA = 25°C) - enables multi-year battery life in always-on sensor nodes |
| Switch VCE(SAT) | 295 mV at 500 mA (TA = 25°C) - minimizes conduction loss in high-current pulse loads |
| Low-Battery Threshold | 200 mV (±10 mV) on LBI pin - triggers LBO output to signal end-of-life for 1.5V primary cells |
| Shutdown Current | 1–3 µA - ensures near-zero system standby drain when SHDN is grounded |
Pinout & Package
LT1307CS8#TRPBF is housed in an 8-lead MSOP (MS8) package with exposed pad for thermal enhancement. Pin spacing is 0.65 mm, body dimensions are 3.0 mm × 3.0 mm × 0.85 mm, and it is RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connect series RC (e.g., 100kΩ + 680pF) to ground; critical for loop stability and transient response |
| FB (Pin 2) | Feedback input | Senses output via resistor divider; 1.22V reference enables precise output programming (e.g., 3.3V or 5V) |
| SHDN (Pin 3) | Enable/disable control | Pull to GND for shutdown (<3µA IQ); tie to VIN or higher to enable - must never float |
| GND (Pin 4) | Power and signal reference | Direct connection to local ground plane required; separates analog and power return paths |
| SW (Pin 5) | Switch node | Drives external inductor/diode; high di/dt demands short, low-inductance PCB trace |
| VIN (Pin 6) | Main supply input | Requires 1µF ceramic bypass capacitor placed ≤5mm away to suppress switching noise |
| LBI (Pin 7) | Low-battery detector input | Accepts voltage from resistive divider across battery; 200mV threshold detects ~1.0V/cell depletion |
| LBO (Pin 8) | Low-battery open-collector output | Sinks up to 10µA; requires external pull-up (e.g., 1MΩ) to flag battery condition to host MCU |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Burst Mode™ operation | Maintains ≥80% efficiency at 100µA load via gated switching, extending battery life in intermittent-use devices |
| True current-mode PWM architecture | Provides inherent cycle-by-cycle current limiting and stable operation across wide input/output ratios |
| Integrated low-battery detector | Eliminates need for external supervisor IC; 200mV reference and open-collector LBO simplify battery monitoring |
| Single-cell start-up capability | Starts regulation from 0.92V input - supports depleted AA/AAA cells and coin cells in space-constrained designs |
| MSOP-8 package with ceramic capacitor compatibility | Enables ultra-compact layouts using only surface-mount MLCCs (1µF input, 10µF output), no electrolytics required |
Applications
| Portable Medical Sensors | GPS Receivers |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7+ days on a single coin cell. IC Role / Device Role / Timing Role: Boost converter generating stable 3.3V rail for ultra-low-power ADC, RF transceiver, and microcontroller. Use Value: 50µA quiescent current and Burst Mode™ sustain >2000 hours runtime; 1V start-up utilizes full cell capacity. | Use Scenario: Handheld hiking GPS unit powered by two AA cells, requiring clean 3.3V for sensitive RF front-end. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering low-noise 3.3V to GNSS chipset and baseband processor. Use Value: 600kHz switching avoids 455kHz IF band; minimal output ripple preserves RF sensitivity and acquisition time. |
| Cordless Telephones | Diagnostic Instrumentation |
Use Scenario: DECT cordless phone base station with battery backup during AC outage. IC Role / Device Role / Timing Role: Standby power manager converting 1.2V NiMH pack to regulated 3.3V for real-time clock and memory retention. Use Value: Shutdown current <3µA prevents backup battery drain; LBO pin signals low-voltage condition to firmware. | Use Scenario: Portable ECG monitor operating from disposable alkaline batteries with strict 5-year shelf life requirement. IC Role / Device Role / Timing Role: Main power supply for analog front-end, digital signal processor, and LCD display controller. Use Value: Input range down to 1V allows full utilization of battery discharge curve; MSOP-8 footprint minimizes PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307BCS8#TRPBF | No Burst Mode™; continuous 600kHz switching at all loads; 1mA quiescent current (vs. 50µA) | Preferred where low-frequency output ripple is unacceptable (e.g., audio, RF, precision analog) | Select LT1307BCS8#TRPBF when clean output spectrum outweighs battery life; same pinout and layout |
| TPS61200DRCT | Higher 1.2A switch current; 3.3V fixed output option; 5.5V max input; 1.6µA shutdown current | Better suited for higher-current loads (>100mA) or fixed-output designs without feedback divider | Choose TPS61200DRCT for higher output current or simplified BOM; requires layout review due to different pinout |
Compared with LT1307BCS8#TRPBF, the LT1307CS8#TRPBF trades ripple-free operation for 20× lower quiescent current - critical for multi-year battery life. Versus TPS61200DRCT, it offers superior 1V start-up and integrated battery detection but lower peak current capability.
Availability
LT1307CS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, GPS receivers, cordless telephones, and diagnostic instrumentation requiring stable component supply with long-term manufacturability.
Supply support for LT1307CS8#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 legacy Linear parts including the LT1307 family.
The LT1307 product line was designed specifically for ultra-low-power, single-cell boost conversion in space- and energy-constrained portable electronics - emphasizing micropower operation, minimal external components, and robust battery interface functionality.
FAQ
What is the minimum input voltage required for LT1307CS8#TRPBF to start regulation?
The LT1307CS8#TRPBF guarantees start-up and regulation from as low as 0.92V at –40°C and 1.0V at 25°C. This enables full utilization of alkaline, NiMH, and lithium primary cells across their entire discharge curve. At room temperature and light load, it sustains regulation down to 0.92V, making LT1307CS8#TRPBF ideal for long-life battery-powered systems where every millivolt counts.
Does LT1307CS8#TRPBF support fixed 3.3V or 5V output without external resistors?
No, LT1307CS8#TRPBF does not have factory-trimmed fixed outputs. It requires an external resistor divider on the FB pin to set VOUT = 1.22V × (1 + R1/R2). For 3.3V, typical values are R1 = 1.02MΩ and R2 = 604kΩ (1%); for 5V, R1 = 1MΩ and R2 = 329kΩ. This flexibility allows precise output tuning and compensation for resistor tolerance and temperature drift.
How does the Burst Mode™ operation in LT1307CS8#TRPBF affect output voltage ripple?
In LT1307CS8#TRPBF, Burst Mode™ activates below ~100mA load, causing periodic full switching bursts separated by idle periods. This introduces low-frequency ripple (e.g., 5.1kHz at 5mA load) with amplitude up to 200mVP-P. While efficient, this ripple may interfere with sensitive analog or RF circuits. The LT1307CS8#TRPBF datasheet provides spectral plots confirming suppression of energy at 455kHz - a key design advantage for communications systems.
Can LT1307CS8#TRPBF drive a 100mA load continuously?
Yes, LT1307CS8#TRPBF supports continuous operation up to 100mA output current when properly heatsinked and with appropriate external components (e.g., 10µH inductor, low-ESR ceramic caps). Its internal NPN switch is rated for 500mA peak current and 295mV VCE(SAT), enabling reliable 75mA delivery at 3.3V from 1.25V input. For sustained 100mA, verify junction temperature remains ≤125°C using θJA = 120°C/W (SO-8) or 160°C/W (MSOP-8).
What is the function of the LBI and LBO pins on LT1307CS8#TRPBF?
The LBI (Low-Battery Input) pin accepts a scaled battery voltage; when it falls below 200mV (±10mV), the open-collector LBO (Low-Battery Output) pin pulls low. LBO requires an external pull-up resistor (typically 1MΩ) to generate a logic-low flag for the host microcontroller. This integrated detector eliminates external supervisor ICs and supports accurate end-of-life detection for 1.5V alkaline cells (e.g., 1.0V/cell threshold).
LT1307CS8#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:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1307CS8#TRPBF FAQ
1.How can I place an order for LT1307CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307CS8#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 LT1307CS8#TRPBF reliable?
The price and inventory of LT1307CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1307CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307CS8#TRPBF?
LT1307CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307CS8#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 LT1307CS8#TRPBF?
For technical support, including LT1307CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307CS8#TRPBF requirements.
6.How does Aetrix verify that LT1307CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1307CS8#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 LT1307CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1307CS8#TRPBF?
All LT1307CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307CS8#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 LT1307CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1307CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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