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Analog Devices Inc. LT1306ES8#TRPBF
- Part No.:
- LT1306ES8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1306ES8#TRPBF.pdf
- Description:
- IC REG BOOST 5V 2.3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,680
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Product details
Overview
LT1306ES8#TRPBF 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 Burst Mode™ for light-load efficiency. It is used in portable instrumentation requiring compact, high-efficiency boost conversion with seamless mode transition.
For engineers reviewing the LT1306ES8#TRPBF datasheet, LT1306ES8#TRPBF pinout, LT1306ES8#TRPBF application, or LT1306ES8#TRPBF equivalent, key selection criteria include input voltage range (1.8V–7V), output disconnect during shutdown, 160µA quiescent current, external synchronization capability (425–500kHz), and SO-8 thermal performance under 1A load.
Technical Context
The LT1306ES8#TRPBF implements current-mode PWM control 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 Burst Mode™ at light loads-enables stable regulation across 0–1A output while minimizing idle supply current to 160µA.
It integrates both main switch and synchronous rectifier (NPN topology), with mode control governed by hysteretic comparator logic that enables automatic step-up/step-down functionality based on VIN vs. VOUT relationship. Shutdown disables all circuitry except rectifier driver until stored inductive energy dissipates, reducing supply current to 9µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable via FB divider; nominal 5V or 3.3V output with 1.24V reference (±2% tolerance) |
| Input Voltage Range | 1.8V to 7V; undervoltage lockout triggers below 1.55V, enabling reliable start-up from single-cell Li-Ion |
| Switching Frequency | 260–310kHz (typical 300kHz); externally synchronizable from 425kHz to 500kHz for EMI control |
| Peak Switch Current Limit | 2.3A at low duty cycle; reduces to 2.0A at high duty cycle-supports 1A continuous output with margin |
| Quiescent & Shutdown Current | 160µA in idle mode; 9µA in shutdown-critical for battery runtime in portable systems |
| Efficiency at 5V/1A | Up to 89% at VIN = 4.2V (Figure 1); drops to ~75% at VIN = 2.6V due to conduction losses |
| Thermal Performance | θJA = 90°C/W in SO-8 package; max junction temperature 125°C-requires minimal copper area for 1A operation |
Pinout & Package
LT1306ES8#TRPBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package with exposed pad not electrically connected. Thermal resistance θJA = 90°C/W; maximum junction temperature 125°C. Pin 4 (GND) must be soldered to a solid ground plane using multiple vias per layout guidelines (Figure 8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Connect RC network (R3/CZ/CP) here to stabilize loop; sets peak inductor current and regulates output power |
| FB (Pin 2) | Inverting input of error amplifier | Feedback node for output voltage divider; 10–25nA bias current requires R2 ≤ 249kΩ for <0.5% error |
| VOUT (Pin 3) | Regulated output / synchronous rectifier emitter | Must remain ≤5.5V; connects directly to output capacitor bank; carries full load current and ripple |
| GND (Pin 4) | Power and signal ground reference | Primary return path for switch, rectifier, and error amplifier; requires low-inductance connection to ground plane |
| SW (Pin 5) | Switch node / collector of main switch & rectifier | High dv/dt node; trace must be short and direct to minimize EMI and switching losses |
| CAP (Pin 6) | Bootstrap supply for synchronous rectifier driver | Driven by external diode (D1) and capacitor (C1); supplies base drive for Q2; ripple <0.3V required |
| VIN (Pin 7) | Main input supply / battery connection | Bypass with 22µF tantalum + 0.1µF ceramic near pin; supports 1.8–7V operation with UVLO protection |
| 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 forward drop to 0.49–0.675V at 2A, improving efficiency by ~5–8% over diode-based designs |
| Automatic step-up/step-down mode transition | Operates as boost when VIN < VOUT and as step-down when VIN > VOUT without topology change-enables single-inductor dual-mode conversion |
| Burst Mode™ operation | Reduces quiescent current to 160µA at light loads by gating switching cycles; increases light-load efficiency vs. DCM-only operation |
| Controlled start-up current | Prevents inrush into capacitive loads; limits peak inductor current during VIN ramp-up, protecting battery and input caps |
| External synchronization support | Accepts 425–500kHz clock on S/S pin to eliminate beat frequencies in multi-converter systems and tighten EMI spectral peaks |
Applications
| Satellite Phones | Portable Instruments |
|---|---|
Use Scenario: Powering RF front-end and baseband ICs from single Li-Ion cell with strict battery life requirements. IC Role / Device Role / Timing Role: Primary DC/DC converter generating stable 5V rail for analog and digital subsystems. Use Value: 89% peak efficiency at 4.2V input extends talk time; 9µA shutdown current preserves charge during standby. |
Use Scenario: Supplying 3.3V/1A to microcontroller, ADC, and display in handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency boost regulator with seamless VIN > VOUT step-down capability during battery discharge. Use Value: Maintains regulated 3.3V output down to 1.8V input; eliminates need for secondary LDO or buck converter. |
| Personal Digital Assistants | Palmtop Computers |
Use Scenario: Generating 5V for USB peripherals and memory interfaces from aging 3.6V nominal battery. IC Role / Device Role / Timing Role: Synchronous boost converter with output disconnect during sleep mode. Use Value: Internal output disconnect eliminates external load switch; 160µA idle current minimizes leakage in suspend states. |
Use Scenario: Providing 5V/1A to FPGA I/O banks and flash memory while managing thermal budget in thin form factor. IC Role / Device Role / Timing Role: Fixed-frequency current-mode regulator with SO-8 thermal profile suitable for constrained PCB area. Use Value: 90°C/W θJA allows 1A operation with minimal copper; Burst Mode™ suppresses audible noise during light-load UI rendering. |
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; 1.2A switch; no integrated rectifier (requires external Schottky) | Better suited for space-constrained designs needing smaller inductors; lower light-load efficiency due to diode loss | Select when board area is critical and 1.3MHz EMI profile is acceptable; avoid if >85% light-load efficiency required. |
| TPS61088RHLR | 5.5V max input; 12A switch; integrated MOSFETs; 2.5V–5.5V output programmable via resistor | Supports higher output currents and wider VIN range but lacks VIN > VOUT step-down mode | Choose for higher-power applications (>1.5A) or adjustable output; not suitable where seamless step-down functionality is mandatory. |
Compared with LT1306ES8#TRPBF, LT3467ES6#TRPBF trades integrated rectification and step-down capability for higher frequency and smaller passives, while TPS61088RHLR offers greater current headroom but omits the unique VIN > VOUT operating mode-making LT1306ES8#TRPBF irreplaceable in dual-mode single-inductor architectures.
Availability
LT1306ES8#TRPBF is available at Aetrix Electronics and suitable for satellite communications, portable instrumentation, personal digital assistants, and palmtop computing applications requiring stable component supply, long-term manufacturability, and guaranteed parametric performance over –40°C to 85°C.
Supply support for LT1306ES8#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 product support, datasheet archives, and application engineering resources for legacy Linear parts including the LT1306 series.
The LT1306ES8#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable electronics requiring high efficiency at light loads, robust start-up from weak cells, and minimal external components.
FAQ
What is the minimum input voltage required for LT1306ES8#TRPBF to start switching?
The LT1306ES8#TRPBF has an undervoltage lockout threshold of 1.55V (min), and is guaranteed to start switching with VIN ≥ 1.8V. Below this, the internal UVLO circuit pulls VC low and halts switching while drawing only 160µA-ensuring reliable startup from partially discharged Li-Ion cells. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Does LT1306ES8#TRPBF support true step-down operation when VIN exceeds VOUT?
Yes, the LT1306ES8#TRPBF automatically transitions to step-down mode when VIN > VOUT, as verified by Figures 3 and 4 (DC transfer characteristics) and the "Stepdown-Mode Rectifier Voltage" specification (1.3–1.8V at 1A). In this mode, the synchronous rectifier operates in linear region rather than saturation, enabling bipolar inductor voltage and volt-second balance-no external reconfiguration is needed.
What is the purpose of the CAP pin on LT1306ES8#TRPBF, and what external components does it require?
The CAP pin on LT1306ES8#TRPBF supplies the bootstrap voltage for the synchronous rectifier driver. It requires an external Schottky diode (e.g., MMBD914LT1 or BAT54) and capacitor (e.g., 1µF AVX TAJA105K020) connected between VIN and CAP. During Q1 conduction, C1 charges to VIN − VF(D1) − VCE(SAT)(Q1); during Q1 off-time, CAP voltage rises to VOUT + VCE(SAT)(Q2) + residual, enabling full base drive for Q2.
Can LT1306ES8#TRPBF be synchronized to an external clock, and what are the timing constraints?
Yes, the S/S pin of LT1306ES8#TRPBF accepts external synchronization pulses in the 425–500kHz range, as specified in the Electrical Characteristics table. The sync signal must be positive-edge triggered with rise time ≤600ns (per Figure G10) and amplitude ≥1.5V. Exceeding the recommended frequency or violating rise-time limits may cause jitter or loss of lock-verified in Typical Performance Characteristic "Maximum Allowable Rise Time of Synchronizing Pulse."
How does Burst Mode™ operation improve efficiency in LT1306ES8#TRPBF at light loads?
Burst Mode™ in LT1306ES8#TRPBF reduces quiescent current to 160µA by disabling most internal circuitry (except error amplifier and comparators) and delivering energy in discrete bursts rather than continuous switching. This avoids the extremely low peak switch current (<250mA limit in burst mode) inherent to DCM, resulting in higher energy-per-cycle and fewer total switching events-confirmed by efficiency curves in Figure 1 and G01 showing >75% efficiency at 10mA load.
LT1306ES8#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:
- 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#TRPBF FAQ
1.How can I place an order for LT1306ES8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1306ES8#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 LT1306ES8#TRPBF reliable?
The price and inventory of LT1306ES8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1306ES8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1306ES8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1306ES8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1306ES8#TRPBF?
LT1306ES8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1306ES8#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 LT1306ES8#TRPBF?
For technical support, including LT1306ES8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1306ES8#TRPBF requirements.
6.How does Aetrix verify that LT1306ES8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1306ES8#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 LT1306ES8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1306ES8#TRPBF?
All LT1306ES8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1306ES8#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 LT1306ES8#TRPBF part is unused and in its original packaging.
Return procedure for LT1306ES8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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