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Analog Devices Inc. LT1306ES8#PBF
- Part No.:
- LT1306ES8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1306ES8#PBF.pdf
- Description:
- IC REG BOOST 5V 2.3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1306ES8#PBF from Analog Devices (formerly Linear Technology) is a fully integrated, fixed-frequency synchronous step-up DC/DC converter with internal 2A power switch and synchronous rectifier. It delivers 5V at 1A from a single Li-Ion cell (VIN ≥ 1.8V), maintains regulation when VIN > VOUT for step-down operation, and features 300kHz current-mode PWM control with external synchronization capability (425–500kHz). Used in portable instrumentation requiring compact, high-efficiency boost conversion.
For engineers reviewing the LT1306ES8#PBF datasheet, LT1306ES8#PBF pinout, LT1306ES8#PBF application, or LT1306ES8#PBF equivalent, key selection criteria include its 1.24V reference voltage, 160µA quiescent current, 9µA shutdown current, burst mode operation at light loads, and SO-8 package compatibility with board-level thermal management for 1A output.
Technical Context
The LT1306ES8#PBF implements a current-mode PWM architecture with an internal 300kHz oscillator, compensating ramp, and transconductance error amplifier (gm = 80–220 µΩ⁻¹). Its dual-mode operation-fixed-frequency CCM at heavy loads and hysteretic burst mode at light loads-enables high efficiency across 1mA–1A load range while maintaining tight output regulation.
It supports seamless transition between boost and step-down modes via internal mode-control comparator, with VIN > VOUT threshold at VIN – 0.1V and stepdown rectifier voltage defined as 0.3 + VIN to 0.7 + VIN V. The synchronous rectifier driver uses bootstrap supply (CAP pin) with clamped VC output (1.18–1.38V) and controlled start-up input current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable via FB divider; nominal 5V or 3.3V output with 1.24V ±2% reference |
| Input Voltage Range | 1.8V to 7V; undervoltage lockout at 1.55–1.8V ensures reliable start-up from single Li-Ion |
| Switching Frequency | 260–310kHz (typ), externally synchronizable to 425–500kHz to eliminate beat frequencies |
| Peak Switch Current Limit | 2.3A at low duty cycle; reduces to 2.0A at high duty cycle for thermal safety |
| Quiescent & Shutdown Current | 160µA in idle mode; 9µA typ in shutdown-critical for battery runtime extension |
| Efficiency | Up to 90% at 5V/1A (VIN = 4.2V); >75% at 10mA load due to burst mode optimization |
| Thermal Limit | Junction temperature max 125°C; θJA = 90°C/W in SO-8 package dictates heatsinking needs |
Pinout & Package
LT1306ES8#PBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package per LTC DWG #05-08-1610, with exposed pad not electrically connected. Thermal resistance θJA = 90°C/W requires local ground plane and multiple vias under Pin 4 (GND) per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Connect RC network to ground for loop stability; sets peak inductor current and regulates output power |
| FB (Pin 2) | Inverting input of error amplifier | Feedback point for output voltage divider; 10–25nA bias current mandates R2 ≤ 249kΩ for <0.5% error |
| VOUT (Pin 3) | Regulated output / synchronous rectifier emitter | Must remain ≤5.5V; connects to output capacitor bank and load; carries full output current |
| GND (Pin 4) | Power and signal ground reference | Primary return path for switch, rectifier, and error amplifier; requires low-impedance connection to ground plane |
| SW (Pin 5) | Switch node / collector of main switch & rectifier | High dv/dt node; must be routed short and away from sensitive traces to minimize EMI |
| CAP (Pin 6) | Bootstrap supply for synchronous rectifier driver | Driven by external diode/capacitor (D1/C1); supplies base drive for Q2; ripple <0.3V required |
| VIN (Pin 7) | Main input supply / battery connection | Bypassed with 22µF tantalum + 0.1µF ceramic near pin; supports 1.8–7V operation |
| S/S (Pin 8) | Shutdown and synchronization input | Active-low shutdown (threshold 0.45V); also accepts 425–500kHz sync pulses on positive edge |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification with integrated NPN Q2 | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by ~5–8% vs. asynchronous designs |
| Automatic burst mode at light loads | Reduces quiescent current to 160µA and enables >80% efficiency down to 1mA load without external control |
| Step-up/step-down dual-mode operation | Operates as buck-boost without topology change; maintains regulation when VIN exceeds VOUT using same inductor |
| Controlled start-up input current | Prevents battery sag or protection circuit tripping during power-on by limiting inrush into inductor |
| External clock synchronization | Enables EMI reduction in multi-converter systems by aligning switching edges and eliminating subharmonic interference |
| Internal 2A power switch with 0.45V VCE(SAT) | Supports 1A continuous output with margin; low saturation voltage minimizes conduction loss at full load |
Applications
| Satellite Phones | Portable Instruments |
|---|---|
Use Scenario: Compact handheld satellite terminal powered by single Li-Ion cell requiring stable 5V rail for RF front-end and baseband ICs. IC Role / Device Role / Timing Role: Primary DC/DC converter generating regulated 5V from 2.6–4.2V battery, supporting both transmit (high-current) and receive (low-current) modes. Use Value: Burst mode extends standby time; synchronous rectification and low IQ preserve battery life during intermittent data bursts. |
Use Scenario: Handheld multimeter or gas detector with LCD display, microcontroller, and analog front-end operating from two alkaline cells. IC Role / Device Role / Timing Role: Boost converter delivering 3.3V/500mA for MCU and sensors while maintaining regulation as battery discharges from 3.0V to 1.8V. Use Value: Step-down capability allows graceful transition to linear regulation when VIN > VOUT, avoiding output overvoltage during fresh battery condition. |
| Personal Digital Assistants | Palmtop Computers |
Use Scenario: Legacy PDA with ARM processor, flash memory, and touchscreen controller requiring clean 3.3V supply from single-cell Li-Ion. IC Role / Device Role / Timing Role: System power supply managing dynamic load steps (e.g., backlight ON/OFF, USB enumeration) while minimizing audible noise. Use Value: Fixed-frequency PWM avoids beat frequencies with audio circuits; low EMI layout guidance ensures signal integrity in dense PCBs. |
Use Scenario: Early palmtop PC with VGA display, SD card interface, and 32-bit CPU needing efficient 5V rail from dual NiMH cells (2.4–3.0V). IC Role / Device Role / Timing Role: High-current boost converter delivering 5V/1A with thermal-aware duty cycle limiting to prevent SO-8 package overheating. Use Value: Internal 2A switch and 90°C/W θJA enable full-load operation without external FETs; CAP pin bootstrap simplifies layout vs. charge-pump alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467ES6#TRPBF | Higher 1.3MHz switching frequency; lower 600mA output current; no step-down mode; requires external MOSFETs | Better suited for space-constrained designs needing smaller inductors; unsuitable for VIN > VOUT operation | Select LT3467ES6#TRPBF only when board area is critical and step-down functionality is unnecessary |
| TPS61040DRVT | 2.5–5.5V input; 28V max output; 400mA output; 500kHz fixed frequency; no internal synchronous rectifier | Requires external Schottky diode; higher dropout and lower efficiency at 1A; lacks burst mode and VIN > VOUT support | Choose TPS61040DRVT if cost is primary concern and 500mA output suffices; avoid for 1A or dual-mode requirements |
Compared with LT1306ES8#PBF, LT3467ES6#TRPBF trades step-down capability and 1A output for higher frequency and smaller magnetics, while TPS61040DRVT sacrifices integration and light-load efficiency for lower unit cost-neither offers the same combination of internal 2A switches, burst mode, and seamless boost/step-down operation.
Availability
LT1306ES8#PBF is available at Aetrix Electronics and suitable for satellite communications equipment, portable test instruments, handheld medical devices, and industrial data loggers requiring stable component supply with long-term manufacturability.
Supply support for LT1306ES8#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 LT1306 series.
The LT1306 belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable electronics requiring high efficiency across wide load ranges and robust operation from single- or dual-cell sources.
FAQ
What is the minimum input voltage required for LT1306ES8#PBF to start up and regulate?
The LT1306ES8#PBF has an undervoltage lockout threshold of 1.55–1.8V and is guaranteed to start up and regulate with VIN ≥ 1.8V. This enables reliable operation from deeply discharged single Li-Ion cells or two alkaline/NiMH cells, making it suitable for long-life portable applications where battery voltage drops below 2.0V.
Can LT1306ES8#PBF operate when input voltage exceeds output voltage?
Yes, the LT1306ES8#PBF automatically transitions into step-down mode when VIN > VOUT, with a defined threshold at VIN – 0.1V. In this mode, the synchronous rectifier operates with bipolar voltage swing, maintaining regulation without external components-enabling true buck-boost functionality using only the standard boost topology.
How does burst mode operation improve light-load efficiency in LT1306ES8#PBF?
Burst mode reduces LT1306ES8#PBF quiescent current to 160µA by stopping switching and powering the load from the output capacitor until VC falls below a hysteresis threshold. This eliminates switching losses at light loads, achieving >80% efficiency at 1mA-significantly outperforming fixed-frequency operation which would waste energy in gate drive and core losses.
What are the recommended external components for LT1306ES8#PBF in a 5V/1A design?
For a 5V/1A design, LT1306ES8#PBF requires: 10µH shielded toroidal inductor (e.g., CTX10-2), 22µF input tantalum (CIN1) + 0.1µF ceramic (CIN2), 220µF low-ESR output tantalum (CO1), 1µF ceramic bootstrap capacitor (C1), BAT54 Schottky bootstrap diode (D1), and resistor divider R1 = 768kΩ / R2 = 249kΩ for 5V output.
Is LT1306ES8#PBF pin-compatible with other members of the LT130x family?
No, LT1306ES8#PBF is not pin-compatible with LT1302, LT1304, LT1307, or LT1308 variants-the SO-8 pinout is unique to the LT1306. While functional similarities exist (e.g., synchronous rectification, burst mode), differences in FB reference, S/S functionality, and internal switch ratings preclude direct substitution without circuit redesign.
LT1306ES8#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2.3A (Switch)
- Frequency - Switching:
- 310kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1306ES8#PBF FAQ
1.How can I place an order for LT1306ES8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1306ES8#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 LT1306ES8#PBF reliable?
The price and inventory of LT1306ES8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1306ES8#PBF is usually 5 days.
3.What payment methods are accepted for LT1306ES8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1306ES8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1306ES8#PBF?
LT1306ES8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1306ES8#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 LT1306ES8#PBF?
For technical support, including LT1306ES8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1306ES8#PBF requirements.
6.How does Aetrix verify that LT1306ES8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1306ES8#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 LT1306ES8#PBF meets industry standards.
7.What is the process for return or replacement of LT1306ES8#PBF?
All LT1306ES8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1306ES8#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 LT1306ES8#PBF part is unused and in its original packaging.
Return procedure for LT1306ES8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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