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Analog Devices Inc. LT1307BCS8#PBF
- Part No.:
- LT1307BCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1307BCS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
LT1307BCS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz PWM boost DC/DC converter optimized for single-cell alkaline/NiMH operation down to 1V input. It delivers up to 75mA at 3.3V or 50mA at 5V with 1.0mA quiescent current, continuous switching at light loads (no Burst Mode), and integrated low-battery detection (200mV threshold). It targets space-constrained portable medical and communication devices requiring clean, ripple-free output under variable load.
For engineers reviewing the LT1307BCS8#PBF datasheet, LT1307BCS8#PBF pinout, LT1307BCS8#PBF application, or LT1307BCS8#PBF equivalent, key selection criteria include its 1V minimum input, absence of low-frequency output ripple, 295mV switch VCE(SAT) at 500mA, 1.22V feedback reference, and MSOP-8 package compatibility with ceramic-only external components.
Technical Context
The LT1307BCS8#PBF implements a current-mode PWM architecture with a 600kHz oscillator and no hysteresis in its error amplifier comparator-ensuring continuous switching across all load conditions. Its internal NPN power switch features 295mV VCE(SAT) at 500mA and supports duty cycles up to 84%, enabling high-efficiency step-up conversion from sub-1.2V inputs.
Unlike the LT1307 variant, the LT1307B disables Burst Mode operation entirely, eliminating low-frequency output ripple at the expense of light-load efficiency. It integrates a 200mV precision low-battery detector with open-collector LBO output and uses an external RC network on the VC pin for loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 5V - enables direct operation from single alkaline, NiMH, or Li-ion cells without pre-regulation. |
| Switching Frequency | 600kHz (typ) - allows use of small 10µH inductors and 1–10µF ceramic capacitors, minimizing board area. |
| Quiescent Current | 1.0mA (typ) - defines baseline power draw during active regulation; significantly higher than LT1307's 50µA but ensures ripple-free output. |
| Feedback Reference | 1.22V (±20mV) - sets regulated output voltage via external resistor divider (e.g., 3.3V = 1.22V × (1 + R1/R2)). |
| Switch VCE(SAT) | 295mV at 500mA - limits conduction loss in the internal NPN transistor, supporting >85% efficiency at medium loads. |
| Low-Battery Threshold | 200mV (±10mV) - triggers LBO output when battery voltage drops below usable level, enabling system-level shutdown. |
| Shutdown Current | 3µA (max) - ensures near-zero power draw when SHDN pin is grounded, preserving battery life in standby. |
Pinout & Package
LT1307BCS8#PBF is housed in an 8-lead MSOP (MS8) package with exposed pad for thermal enhancement. Pin spacing is 0.65mm, body size 3.0mm × 3.0mm × 0.85mm, and it is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node | Connects external RC network (e.g., 100kΩ + 680pF) to stabilize feedback loop; critical for transient response and stability. |
| FB (Pin 2) | Feedback input | Senses output voltage divider; 1.22V reference enables precise output regulation (e.g., 3.3V, 5V) with <±1% accuracy. |
| SHDN (Pin 3) | Enable control | Active-high logic: tie to VIN or higher to operate; ground to disable IC and reduce supply current to ≤3µA. |
| GND (Pin 4) | Power and signal ground | Must connect directly to local ground plane; serves as return path for switch current and feedback reference. |
| SW (Pin 5) | Switch node | Drives external inductor/diode; high dv/dt requires short, low-inductance trace routing to minimize EMI and ringing. |
| VIN (Pin 6) | Main power input | Accepts 1V–5V; requires 1µF ceramic bypass capacitor placed within 5mm for stable operation and noise suppression. |
| LBI (Pin 7) | Low-battery sense input | High-impedance input referenced to 200mV; connects to resistive divider from battery to detect end-of-life condition. |
| LBO (Pin 8) | Low-battery open-collector output | Sinks 10µA when LBI < 200mV; requires external pull-up (e.g., 1MΩ) to interface with microcontroller interrupt or reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous 600kHz switching | Eliminates low-frequency output ripple (<10kHz) common in Burst Mode converters-critical for noise-sensitive analog/RF circuits. |
| Single-cell 1V start-up capability | Enables full functionality from depleted alkaline or NiMH cells, extending usable battery life in portable instrumentation. |
| Integrated low-battery detector | Provides system-level battery monitoring without external comparators-reduces BOM count and PCB area in glucose meters and diagnostic tools. |
| Ceramic-capacitor only design | Supports 1µF input and 10µF output ceramic caps (no electrolytics), improving reliability, temperature stability, and long-term aging performance. |
| Internal 500mA NPN switch | Reduces external component count and layout complexity while maintaining <300mV conduction loss at rated current. |
Applications
| Precision Glucose Meters | GPS Receiver Power Supply |
|---|---|
Use Scenario: Portable handheld glucose meter operating from two AAA alkaline cells with strict EMI and ripple requirements for accurate analog sensor readings. IC Role / Device Role / Timing Role: Primary 3.3V/5V boost regulator delivering stable rail to ADC, op-amps, and microcontroller; replaces discrete charge-pump solutions. Use Value: Continuous 600kHz operation avoids sub-audio ripple that would corrupt low-level electrochemical sensor signals, ensuring ±0.5% measurement accuracy. | Use Scenario: Compact GPS module in asset tracker requiring clean 3.3V supply for RF front-end and baseband processor under varying battery voltage (1.0–1.5V). IC Role / Device Role / Timing Role: Single-cell boost converter powering GPS chipset; LBO signal triggers firmware battery warning before brownout. Use Value: 1V start-up and 200mV low-battery threshold enable full GPS acquisition and lock even at end-of-cell voltage, extending field deployment time by ≥15%. |
| Cordless Telephone Base Station | Portable Diagnostic Instrumentation |
Use Scenario: Rechargeable cordless phone base station using NiMH battery pack, needing efficient 5V rail for charging circuitry and display backlight. IC Role / Device Role / Timing Role: High-efficiency boost converter supplying 50mA at 5V; SHDN pin controlled by MCU to disable during sleep mode. Use Value: 1.0mA quiescent current minimizes standby drain, while continuous switching prevents audible coil whine in speaker/headset audio paths. | Use Scenario: Handheld ECG or pulse oximeter with OLED display and analog front-end, powered by single AA cell and requiring ultra-low-noise 3.3V supply. IC Role / Device Role / Timing Role: Primary power management IC generating regulated 3.3V; VC pin compensation tuned for fast load-step response to display updates. Use Value: Absence of Burst Mode eliminates 5–50kHz ripple that would couple into sensitive biopotential amplifiers, meeting IEC 60601-2-27 EMI immunity requirements. |
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 | Includes Burst Mode for 50µA quiescent current; 600kHz switching; same pinout and package. | Preferred where light-load efficiency > ripple cleanliness (e.g., infrequently sampled sensors). | Select LT1307CS8#PBF only if system can tolerate low-frequency output ripple and prioritizes battery runtime over signal integrity. |
| TPS61200DRCR | 2.5V–5.5V input range; no sub-1.2V start-up; 1.2MHz switching; 55µA IQ; different pinout (10-pin SON). | Requires PCB redesign; unsuitable for true single-cell <1.2V operation but offers higher frequency and lower IQ above 2.5V. | Choose TPS61200DRCR only for multi-cell or Li-ion systems where 1V start-up is not required and layout space permits new footprint. |
Compared with LT1307CS8#PBF, the LT1307BCS8#PBF trades 20× higher quiescent current for zero low-frequency ripple-making it essential for analog/RF signal chains. Against TPS61200DRCR, it provides unique 1V start-up capability but lacks modern features like I2C control or programmable soft-start.
Availability
LT1307BCS8#PBF is available at Aetrix Electronics and suitable for portable medical devices, GPS receivers, cordless telephones, and battery-backed instrumentation requiring stable component supply, long-lifecycle support, and guaranteed single-source availability.
Supply support for LT1307BCS8#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 support for legacy Linear power products including the LT1307 family. The company specializes in high-performance analog, mixed-signal, and power management ICs for precision applications.
The LT1307/LT1307B product line was designed specifically for ultra-low-voltage, micropower boost conversion in single-cell portable electronics-emphasizing minimal external components, ceramic-capacitor compatibility, and robust operation across wide temperature ranges.
FAQ
What is the minimum input voltage required for LT1307BCS8#PBF to start switching?
The LT1307BCS8#PBF guarantees start-up and regulation from 1.0V input across the commercial temperature range. At –40°C, the minimum functional input rises to 1.1V per datasheet specifications. This 1V capability enables reliable operation from nearly depleted alkaline or NiMH cells, distinguishing LT1307BCS8#PBF from most competing boost converters that require ≥1.8V.
Does LT1307BCS8#PBF support adjustable output voltage, and how is it set?
Yes, LT1307BCS8#PBF supports adjustable output voltage via the FB pin. The internal 1.22V reference connects to a resistor divider between VOUT and GND; output is calculated as VOUT = 1.22V × (1 + R1/R2). For example, 3.3V requires R1 = 1.02MΩ and R2 = 604kΩ (1%). The LT1307BCS8#PBF datasheet provides standard resistor values for 3.3V and 5V configurations.
How does the low-battery detector in LT1307BCS8#PBF function, and what external components are needed?
The LT1307BCS8#PBF integrates a 200mV precision threshold detector. Connect LBI to a resistive divider from VIN to GND (e.g., 1MΩ top, 100kΩ bottom yields ~91mV at 1.0V input). When LBI falls below 200mV, LBO pulls low (≤0.25V @ 10µA sink). An external 1MΩ pull-up to VOUT or logic rail is required to generate a clean digital alert signal for the host MCU.
Can LT1307BCS8#PBF be used with ceramic output capacitors only, and what is the minimum value?
Yes, LT1307BCS8#PBF is explicitly designed for ceramic-only external components. The datasheet specifies a minimum 10µF X5R/X7R ceramic capacitor at the output (COUT), paired with a 1µF ceramic input capacitor (CIN) placed within 5mm of VIN. This eliminates electrolytics, improving reliability and temperature stability-confirmed in Figure 1 and Layout Hints section of the LT1307B datasheet.
What is the purpose of the VC pin on LT1307BCS8#PBF, and how is it configured?
VC is the error amplifier output and compensation node. It requires an external series RC network (e.g., 100kΩ + 680pF) connected from VC to GND to stabilize the feedback loop. Proper VC compensation determines transient response, phase margin, and ripple rejection-Figure 11e in the datasheet shows the optimized 100kΩ/680pF solution for minimal settling time without overshoot in the LT1307BCS8#PBF application circuit.
LT1307BCS8#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:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1307BCS8#PBF FAQ
1.How can I place an order for LT1307BCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307BCS8#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 LT1307BCS8#PBF reliable?
The price and inventory of LT1307BCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307BCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1307BCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307BCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307BCS8#PBF?
LT1307BCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307BCS8#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 LT1307BCS8#PBF?
For technical support, including LT1307BCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307BCS8#PBF requirements.
6.How does Aetrix verify that LT1307BCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1307BCS8#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 LT1307BCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1307BCS8#PBF?
All LT1307BCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307BCS8#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 LT1307BCS8#PBF part is unused and in its original packaging.
Return procedure for LT1307BCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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