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Analog Devices Inc. LT1307CS8#PBF
- Part No.:
- LT1307CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1307CS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:265
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Product details
Overview
LT1307CS8#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 LT1307CS8#PBF datasheet, LT1307CS8#PBF pinout, LT1307CS8#PBF application, or LT1307CS8#PBF equivalent, key selection criteria include its 50µA quiescent current, 1.22V feedback reference, low-battery detector with 200mV threshold, and compatibility with small ceramic capacitors-enabling compact, low-EMI designs without electrolytics.
Technical Context
The LT1307CS8#PBF employs current-mode PWM control with a 600kHz oscillator and ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier uses external RC compensation on the VC pin to stabilize loop response across varying load and input conditions.
Burst Mode™ operation-enabled only in the LT1307 (not LT1307B)-reduces switching frequency at light loads (<100mA), lowering average input current to 50µA while maintaining regulation. The low-battery detector (LBI/LBO) provides a 200mV reference with open-collector output and no hysteresis, supporting system-level battery monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 5V - supports direct operation from single-cell batteries as low as 0.92V (min startup), eliminating need for pre-regulation. |
| Output Voltage Accuracy | ±1.6% over temp - set via external resistor divider referenced to 1.22V FB pin, enabling precise 3.3V or 5V outputs. |
| Switching Frequency | 550–750kHz (typ 600kHz) - enables use of small 10µH inductors and 10µF ceramic output capacitors, reducing board area and EMI. |
| Quiescent Current | 50µA (not switching) - ensures >1-year battery life in always-on glucose meters or pagers drawing <100µA standby current. |
| Power Switch VCE(SAT) | 295mV at 500mA - minimizes conduction loss in boost path, sustaining >85% efficiency at 75mA load from 1.25V input. |
| Low-Battery Threshold | 200mV ±10mV - allows accurate detection of single-cell depletion (e.g., ~0.9V alkaline) with external resistive divider on LBI pin. |
| Shutdown Current | ≤3µA - reduces system leakage during sleep mode, critical for battery-backed real-time clocks and memory retainers. |
Pinout & Package
LT1307CS8#PBF is housed in an 8-lead plastic SO package (S8), 3.9mm × 4.9mm, with standard SOIC thermal profile (θJA = 120°C/W). Pin 1 is VC (compensation), pin 2 is FB (feedback), pin 3 is SHDN (shutdown), pin 4 is GND, pin 5 is SW (switch node), pin 6 is VIN (input supply), pin 7 is LBI (low-battery input), and pin 8 is LBO (low-battery open-collector output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connects external RC network (e.g., 100kΩ + 680pF) to ground; sets loop stability and transient response-critical for avoiding oscillation under dynamic load. |
| FB (Pin 2) | Feedback input for output voltage regulation | References internal 1.22V bandgap; resistor divider from VOUT to GND sets output voltage as VOUT = 1.22V × (1 + R1/R2). |
| SHDN (Pin 3) | Enable/disable control input | Must be tied ≥VIN to operate; grounded to shut down IC-draws ≤3µA in shutdown, preventing unintended wake-up from floating inputs. |
| GND (Pin 4) | Power and signal reference ground | Direct connection to local ground plane required; separates power return (SW/GND path) from sensitive analog nodes (FB/VC/LBI) to minimize noise coupling. |
| SW (Pin 5) | Switch node for external inductor/diode | Carries high di/dt pulsed current; requires short, wide trace to reduce EMI and voltage spikes-critical for reliable 600kHz operation. |
| VIN (Pin 6) | Main input supply connection | Requires 1µF ceramic bypass capacitor placed ≤5mm away; supplies peak switch current and stabilizes input impedance during switching transitions. |
| LBI (Pin 7) | Low-battery detector input | Accepts 0–700mV input; compares against 200mV internal reference-used with resistor divider to monitor battery voltage without loading cell. |
| LBO (Pin 8) | Low-battery open-collector output | Sinks ≤10µA when LBI < 200mV; requires external pull-up (e.g., 1MΩ) to system rail-drives microcontroller interrupt or LED indicator. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell 1V start-up capability | Enables direct integration into AA/AAA-powered devices without boost pre-regulator, reducing BOM count and footprint. |
| 50µA quiescent current (LT1307 variant) | Extends battery life in intermittent-use applications like diagnostic instruments where active time is <1% of total runtime. |
| 600kHz fixed-frequency PWM | Permits use of miniature 10µH surface-mount inductors and 10µF ceramic capacitors-eliminating bulky electrolytics and simplifying layout. |
| Integrated low-battery detector | Provides system-level battery monitoring with 200mV threshold and open-collector LBO output-no external comparator or reference needed. |
| Burst Mode™ operation | Maintains >80% efficiency at 100µA load by reducing switching frequency, avoiding the 1mA quiescent penalty of continuous-mode alternatives. |
Applications
| Pager Power Management | GPS Receiver Supply |
|---|---|
Use Scenario: Powers RF front-end and baseband processor in two-way paging devices operating from single AA battery. IC Role / Device Role / Timing Role: Boost converter generating stable 3.3V rail from 0.9–1.5V battery; regulates during transmit bursts and enters Burst Mode™ during idle listening. Use Value: 50µA quiescent current extends battery life to >6 months; 600kHz switching avoids interference with 455kHz IF stages in pager receivers. | Use Scenario: Supplies 3.3V to GPS baseband IC and RF frontend in handheld navigation units. IC Role / Device Role / Timing Role: Single-cell boost regulator with low-noise output; LBO pin triggers firmware battery warning before GPS lock fails. Use Value: 295mV VCE(SAT) sustains >85% efficiency at 50mA load, preserving battery capacity during extended outdoor use. |
| Glucose Meter Core Supply | Portable Diagnostic Instrumentation |
Use Scenario: Provides regulated 3.3V for microcontroller, LCD, and electrochemical sensor interface in battery-operated blood glucose meters. IC Role / Device Role / Timing Role: Primary power converter with shutdown control synchronized to test cycle; FB pin monitors output accuracy for calibration-critical analog circuits. Use Value: ±1.6% output tolerance ensures consistent ADC reference and sensor biasing; 1V minimum input supports full discharge of alkaline cells. | Use Scenario: Powers multi-channel analog front-end and ARM Cortex-M MCU in handheld ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: Micropower DC/DC source with LBI/LBO enabling smart battery management and low-power sleep states. Use Value: 200mV low-battery threshold allows precise end-of-life detection; Burst Mode™ maintains regulation during 10µA sensor bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307BCS8#PBF | No Burst Mode™; continuous 600kHz operation at all loads; 1mA quiescent current vs. 50µA | Preferred where low-frequency output ripple must be avoided (e.g., RF-sensitive receivers), accepting reduced light-load efficiency | Select LT1307BCS8#PBF when clean 3.3V output is prioritized over battery life in always-active systems. |
| TPS61200DRCR | Higher 1.2MHz switching frequency; 2.5V–5.5V input range; integrated Schottky diode; 5.5µA quiescent current in shutdown | Requires ≥2V input; not suitable for true single-cell (1V) start-up; better for Li-ion or dual-cell systems | Choose TPS61200DRCR for higher-frequency, lower-profile designs where input voltage exceeds 2V and integrated diode simplifies layout. |
Compared with LT1307BCS8#PBF, the LT1307CS8#PBF trades higher light-load efficiency for low-frequency ripple; versus TPS61200DRCR, it supports true 1V start-up but lacks integrated diode and higher-frequency operation-making it uniquely suited for cost-sensitive, single-cell alkaline/NiMH applications demanding micropower performance.
Availability
LT1307CS8#PBF is available at Aetrix Electronics and suitable for portable medical devices, GPS receivers, pagers, and battery backup systems requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LT1307CS8#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, datasheet documentation, and application engineering for legacy Linear parts including the LT1307 series.
The LT1307 product line was designed specifically for ultra-low-voltage, micropower boost conversion in single-cell battery-powered instrumentation-emphasizing minimal quiescent current, robust start-up, and integration of battery monitoring functions.
FAQ
What is the minimum input voltage required for LT1307CS8#PBF to start switching?
The LT1307CS8#PBF guarantees start-up at 0.92V (typical) and operates continuously down to 1V input. At 25°C, it sustains regulation with VIN as low as 0.92V, making it suitable for deep-discharge alkaline or NiMH cells. Below this threshold, the device may not initiate switching or maintain output regulation-verified per Electrical Characteristics table on page 2 of the LT1307/LT1307B datasheet. The LT1307CS8#PBF's ability to start at sub-1V enables full utilization of single-cell battery capacity.
Does LT1307CS8#PBF support adjustable output voltage, and how is it configured?
Yes, LT1307CS8#PBF supports adjustable output voltage via an external resistor divider connected to the FB pin. The internal feedback reference is 1.22V, so VOUT = 1.22V × (1 + R1/R2), where R1 connects from VOUT to FB and R2 connects from FB to GND. For example, a 1.02MΩ R1 and 604kΩ R2 yields 3.3V output. The LT1307CS8#PBF's ±1.6% reference accuracy and low FB bias current (27nA typ) ensure stable, precise regulation across temperature and load.
How does the low-battery detector in LT1307CS8#PBF function, and what external components are needed?
The LT1307CS8#PBF's low-battery detector uses an internal 200mV reference applied to the LBI pin. An external resistor divider scales battery voltage to ≤200mV at LBI when the cell reaches end-of-life (e.g., 0.9V for alkaline). LBO is an open-collector output that pulls low when LBI < 200mV and requires a pull-up resistor (typically 1MΩ) to a logic rail. No additional ICs or references are needed-the LT1307CS8#PBF integrates both reference and comparator.
Can LT1307CS8#PBF be used with ceramic output capacitors only, and what is the minimum value?
Yes, LT1307CS8#PBF is explicitly designed for ceramic-only output capacitance. The datasheet specifies a minimum of 10µF ceramic (e.g., X5R/X7R 0805 or 1206) for single-cell applications. This eliminates electrolytic capacitors, reduces size, and improves reliability. Larger values (e.g., 22µF) further suppress Burst Mode™ ripple. Input bypass requires only 1µF ceramic placed within 5mm of VIN-confirmed in Figure 1 and Layout Hints section of the LT1307/LT1307B datasheet.
What is the purpose of the VC pin on LT1307CS8#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 control loop. This network sets phase margin and transient response-critical for preventing oscillation under load steps. The LT1307CS8#PBF's VC pin design allows optimization for specific inductor/capacitor combinations; typical values are validated in Figure 11e of the datasheet for 10µH/10µF configurations.
LT1307CS8#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
LT1307CS8#PBF FAQ
1.How can I place an order for LT1307CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1307CS8#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 LT1307CS8#PBF reliable?
The price and inventory of LT1307CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1307CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1307CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1307CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1307CS8#PBF?
LT1307CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1307CS8#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 LT1307CS8#PBF?
For technical support, including LT1307CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1307CS8#PBF requirements.
6.How does Aetrix verify that LT1307CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1307CS8#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 LT1307CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1307CS8#PBF?
All LT1307CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1307CS8#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 LT1307CS8#PBF part is unused and in its original packaging.
Return procedure for LT1307CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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