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Analog Devices Inc. LT1307CN8#PBF
- Part No.:
- LT1307CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1307CN8#PBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LT1307CN8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz PWM boost DC/DC converter optimized for single-cell alkaline or NiMH 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 in portable medical devices and GPS receivers.
For engineers reviewing the LT1307CN8#PBF datasheet, LT1307CN8#PBF pinout, LT1307CN8#PBF application, or LT1307CN8#PBF equivalent, key selection criteria include its 50µA quiescent current, 1.22V feedback reference, low-battery detector (200mV threshold), 8-pin PDIP package, and compatibility with ceramic input/output capacitors as small as 1µF and 10µF respectively.
Technical Context
The LT1307CN8#PBF implements current-mode PWM control with a 600kHz oscillator and ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier features 35µmhos transconductance and 100V/V gain, compensated externally via the VC pin using a series RC network (e.g., 100kΩ + 680pF).
Burst Mode™ operation-enabled only in the LT1307 variant-reduces average supply current to 50µA at light loads by cycling full switching bursts interspersed with sleep intervals; the LT1307B variant omits this feature for continuous low-ripple operation. The low-battery detector uses a dedicated LBI/LBO pair with 200mV reference and open-collector output capable of sinking 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 5V - supports direct operation from single-cell batteries (e.g., 1.2V NiMH, 1.5V alkaline) without pre-regulation |
| Quiescent Current | 50µA (not switching) - enables >1-year battery life in always-on glucose meters drawing <100µA system current |
| Switching Frequency | 600kHz (typ.) - allows use of compact 10µH surface-mount inductors and 10µF ceramic output capacitors |
| Feedback Reference | 1.22V (±20mV) - sets regulated output voltage via external resistor divider (e.g., 3.3V = 1.22V × (1 + R1/R2)) |
| Power Switch VCE(SAT) | 295mV at 500mA - minimizes conduction loss in high-current pulse loads (e.g., GSM transmit bursts) |
| Low-Battery Threshold | 200mV on LBI pin - triggers LBO open-collector output to signal end-of-life for 1.2V NiMH cells at ~1.0V pack voltage |
| Shutdown Current | 3µA - ensures negligible drain during storage or deep-sleep modes in pagers and cordless handsets |
Pinout & Package
LT1307CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connect external RC network (e.g., 100kΩ + 680pF) to ground; critical for loop stability and transient response |
| FB (Pin 2) | Feedback input | Monitors output voltage via resistor divider; 1.22V reference sets regulation point; trace area must be minimized to reduce noise coupling |
| SHDN (Pin 3) | Enable/disable control | Drive ≥VIN to enable; ground to disable; floating causes erratic behavior; no pull-up required |
| GND (Pin 4) | Power and signal reference | Must connect directly to local ground plane; shared return path for SW, VIN, and FB/VC loops |
| SW (Pin 5) | Switch node | Drives external inductor/diode; high di/dt requires short, wide traces to minimize EMI and voltage spikes |
| VIN (Pin 6) | Main power input | Requires 1µF ceramic bypass capacitor placed ≤5mm away; supplies internal circuitry and switch base drive |
| LBI (Pin 7) | Low-battery detector input | Accepts voltage between 0V–700mV; 200mV threshold detects depleted single-cell batteries; bias current <30nA |
| LBO (Pin 8) | Low-battery detector output | Open-collector NPN; sinks 10µA when LBI <200mV; requires external 1MΩ pull-up to VIN or logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell start-up at 1V | Enables immediate operation from fresh or partially discharged alkaline/NiMH cells without brown-out reset circuits |
| Burst Mode™ operation | Maintains >80% efficiency at 100µA load by reducing average supply current to 50µA, extending battery life in intermittent-use devices |
| Integrated low-battery detector | Eliminates need for external supervisor IC; provides clean, hysteresis-free flag for host microcontroller wake-up or display warning |
| 600kHz fixed-frequency PWM | Permits use of miniature 10µH MLCC-compatible inductors and avoids sensitive IF bands (e.g., 455kHz) in RF-sensitive applications |
| No electrolytic capacitors required | Reduces board area, improves reliability, and enables conformal coating in harsh environments (e.g., diagnostic instrumentation) |
Applications
| Pagers | Cordless Telephones |
|---|---|
Use Scenario: Powering LED status indicators and RF front-end bias during receive mode with infrequent paging alerts. IC Role / Device Role / Timing Role: Boost converter generating stable 3.3V rail from single AA cell; Burst Mode™ suppresses idle current while preserving fast wake-up capability. Use Value: Extends battery life to >6 months per set of alkalines by limiting average current to <10µA during standby. | Use Scenario: Supplying 3.3V to baseband processor and 5V to LCD backlight in DECT handsets with intermittent voice transmission. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering 75mA at 3.3V; fixed 600kHz switching avoids interference with 1.88–1.90GHz transmit band. Use Value: Enables compact PCB layout with ceramic-only passives, eliminating bulky electrolytics near RF sections. |
| GPS Receivers | Glucose Meters |
Use Scenario: Powering GPS baseband IC and RF LNA from coin-cell or AAA battery during cold-start acquisition requiring burst current up to 50mA. IC Role / Device Role / Timing Role: High-efficiency boost converter maintaining 3.3V under dynamic load; low-noise design prevents corruption of weak satellite signals. Use Value: Achieves >85% efficiency at 10mA load, enabling 10-hour runtime on CR2032 while meeting EN 55022 Class B conducted emissions. | Use Scenario: Providing regulated 3.3V to microcontroller, sensor interface, and display during 5-second blood test cycles with <100ms active measurement windows. IC Role / Device Role / Timing Role: Micropower DC/DC converter with integrated low-battery detection; LBO signal triggers audible alert when cell voltage drops below 1.0V. Use Value: Reduces BOM count by replacing discrete supervisor + regulator combo; 50µA IQ supports >2-year shelf life with button-cell backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307BIS8#PBF | Same architecture but in SO-8 package; no Burst Mode™; 1mA quiescent current; industrial temperature range (–40°C to 85°C) | Preferred where low-output-ripple continuity is critical (e.g., audio codec power) and higher IQ is acceptable | Select when board space permits SO-8 and light-load ripple must be eliminated without increasing inductor size |
| TPS61200DRCR | TI part; 0.3V start-up; 1.2MHz switching; 1.25V feedback; integrated Schottky; 5.5µA IQ in shutdown | Better for ultra-low-voltage sources (e.g., LiFePO₄ at 2.0V) but lacks dedicated low-battery detector | Choose when input can drop below 1V or when integrated diode simplifies layout, accepting trade-off of no LBI/LBO functionality |
Compared with LT1307BIS8#PBF, the LT1307CN8#PBF offers lower quiescent current and built-in battery monitoring but requires careful layout for EMI control; versus TPS61200DRCR, it provides deterministic low-battery signaling at the cost of higher minimum input voltage and external diode requirement.
Availability
LT1307CN8#PBF is available at Aetrix Electronics and suitable for pagers, cordless telephones, GPS receivers, glucose meters, and diagnostic medical instrumentation requiring stable component supply across long production lifecycles.
Supply support for LT1307CN8#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 product line was designed specifically for micropower, single-cell boost conversion in battery-critical portable electronics, emphasizing ultra-low IQ, minimal external components, and robust operation across wide temperature and input voltage ranges.
FAQ
What is the minimum input voltage required for LT1307CN8#PBF to start switching?
The LT1307CN8#PBF guarantees start-up and regulation at 1.0V input under commercial temperature conditions (–20°C to 70°C). At –40°C, the minimum functional input rises to 1.1V due to increased internal transistor VBE requirements. Below 1.0V, the device may not initiate switching or sustain regulation, even if bias currents flow - confirmed by Electrical Characteristics table on page 4 of the 1307fa datasheet.
Does LT1307CN8#PBF require an external Schottky diode, and what is the recommended part?
Yes, LT1307CN8#PBF requires an external Schottky diode connected between SW and VOUT. The datasheet specifies the Motorola MBR0520L (0.5A, 20V, 0.22V forward drop) as optimal for 3.3V/5V outputs. For cost-sensitive designs, the 1N4148 may be used below 20mA, though efficiency drops significantly due to its higher 0.7V VF; the LT1307CN8#PBF itself contains no integrated diode.
How does the low-battery detector in LT1307CN8#PBF operate, and what external components are needed?
The LT1307CN8#PBF low-battery detector compares LBI pin voltage to an internal 200mV reference. When LBI falls below 200mV, LBO pulls low (≤0.25V at 10µA sink). No external resistors are needed on LBI - simply connect a voltage divider from VOUT to GND with tap to LBI. LBO requires a 1MΩ pull-up to VIN or logic rail; the LT1307CN8#PBF provides no hysteresis, enabling precise threshold triggering.
Can LT1307CN8#PBF be used to generate 5V output, and what resistor values are required?
Yes, LT1307CN8#PBF supports 5V output using the standard feedback divider. Set R1 = 1.0MΩ and R2 = 329kΩ (1%) to achieve VOUT = 1.22V × (1 + 1.0M/329k) ≈ 5.00V. The datasheet confirms this configuration in Figure 1 footnote. Ensure VC compensation (e.g., 100kΩ + 680pF) is re-optimized for 5V operation, as loop dynamics change with output voltage and load.
What is the thermal performance of LT1307CN8#PBF in the N8 package, and how is junction temperature calculated?
The LT1307CN8#PBF in the 8-lead PDIP (N8) package has θJA = 100°C/W. Junction temperature is calculated as TJ = TA + (PDISS × θJA), where PDISS = (VIN × IQ) + (IOUT² × RDCR) + (ISW × VCE(SAT)). At 75mA output and 1.2V input, typical dissipation is ~120mW, yielding ΔT = 12°C above ambient - well within the 125°C TJMAX limit specified for the LT1307CN8#PBF.
LT1307CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1307CN8#PBF FAQ
1.How can I place an order for LT1307CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307CN8#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 LT1307CN8#PBF reliable?
The price and inventory of LT1307CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1307CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307CN8#PBF?
LT1307CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307CN8#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 LT1307CN8#PBF?
For technical support, including LT1307CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307CN8#PBF requirements.
6.How does Aetrix verify that LT1307CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1307CN8#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 LT1307CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1307CN8#PBF?
All LT1307CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307CN8#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 LT1307CN8#PBF part is unused and in its original packaging.
Return procedure for LT1307CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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