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Analog Devices Inc. LT1308ACF#TRPBF
- Part No.:
- LT1308ACF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LT1308ACF#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 2A 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,764
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Product details
Overview
LT1308ACF#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz boost DC/DC converter optimized for single-cell Li-Ion and multi-cell NiCd/NiMH battery inputs. It delivers up to 1A at 5V from 1V–10V input, features automatic Burst Mode™ operation at light loads, consumes only 140μA quiescent current at no load, and supports output voltages up to 34V. It is used in portable power rails for digital cameras and GPS receivers.
For engineers reviewing the LT1308ACF#TRPBF datasheet, LT1308ACF#TRPBF pinout, LT1308ACF#TRPBF application, or LT1308ACF#TRPBF equivalent, key selection criteria include its 140μA no-load IQ, ±2% 200mV low-battery reference accuracy, 300mV switch VCE(SAT) at 2A, 600kHz switching frequency, and TSSOP-14 package thermal performance (θJA = 80°C/W).
Technical Context
The LT1308ACF#TRPBF implements a current-mode PWM architecture with integrated 36V-rated NPN switch and error amplifier compensation via external RC network on the VC pin. Its Burst Mode™ operation-enabled by hysteresis in comparator A1-reduces average supply current under light loads while maintaining regulation.
It integrates a precision 200mV low-battery detector (±2% over temperature) with open-collector LBO output capable of sinking 50μA, and features a shutdown pin that enables operation at ≥1V independent of VIN. The TSSOP-14 package uses multiple parallel GND, SW, and VIN pins to reduce parasitic inductance and improve thermal dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz typical - enables compact magnetics and reduces output ripple without requiring high-frequency EMI filtering. |
| Input Voltage Range | 1V to 10V - supports direct operation from single Li-Ion (2.7–4.2V), two/three alkaline (1.8–4.5V), or four NiCd cells (4.8–6.0V). |
| Quiescent Current (No Load) | 140μA - minimizes battery drain during standby in always-on portable devices like pagers and GPS receivers. |
| Feedback Reference Voltage | 1.22V ±1.6% - sets output voltage via external resistor divider; enables precise 3.3V, 5V, or 12V regulation with <0.5% total error. |
| Switch VCE(SAT) | 290mV at 2A, 25°C - reduces conduction loss and improves efficiency at high load currents in boost topologies. |
| Low-Battery Detector Accuracy | ±2% at room temperature, ±3% over –40°C to +85°C - ensures reliable battery monitoring without external calibration. |
| Shutdown Current | ≤1μA - guarantees near-zero system leakage when disabled, critical for long-term battery storage. |
Pinout & Package
LT1308ACF#TRPBF is housed in a 14-lead plastic TSSOP package (JEDEC MO-153) with exposed pad for thermal enhancement. θJA = 80°C/W. Pin 1 is VC; pins 4–7 are internally connected GND; pins 8–10 are internally connected SW; pins 11–12 are internally connected VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connects to series RC (e.g., 47kΩ + 100pF) to ground; sets loop stability and transient response. |
| FB (Pin 2) | Feedback input | Monitors output via resistive divider; 1.22V reference enables accurate output voltage setting. |
| SHDN (Pin 3) | Enable/disable control | Active-high logic input; ≥1V enables operation; floating or grounded disables IC with ≤1μA current. |
| GND (Pins 4–7) | Power and signal ground | Four dedicated ground pins minimize impedance and serve as primary heat path; must be tied together at PCB. |
| SW (Pins 8–10) | Switch collector node | Drives external inductor/diode; parallel pins reduce trace inductance and improve current handling. |
| VIN (Pins 11–12) | Main power input | Dual input pins reduce IR drop and improve decoupling; requires local ceramic bypass capacitor. |
| LBI (Pin 13) | Low-battery detector input | Accepts scaled battery voltage; compares against internal 200mV reference to trigger LBO. |
| LBO (Pin 14) | Low-battery open-collector output | Sinks up to 50μA; requires external pull-up (e.g., 220kΩ) to interface with microcontroller interrupt or reset. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces no-load IQ to 140μA while maintaining output regulation - extends battery life in intermittent-use devices. |
| 36V switch rating | Enables >30V output configurations (e.g., 12V or 24V bias supplies) without external transistor stacking. |
| Integrated low-battery detector | ±2% 200mV reference with 50μA sink capability eliminates need for external supervisor IC in space-constrained designs. |
| Multi-pin paralleling (GND/SW/VIN) | Lowers effective package inductance and thermal resistance - improves efficiency and reliability at 1A continuous load. |
| Start-up into heavy loads | Delivers full output voltage even with precharged capacitive loads (e.g., 20Ω), avoiding bootstrapping limitations of CMOS converters. |
Applications
| Digital Camera Power Supply | GSM/CDMA Phone LCD Bias |
|---|---|
Use Scenario: Powers CCD/CMOS image sensor and LCD backlight from single Li-Ion cell. IC Role / Device Role / Timing Role: Boost converter generating stable 5V/1A rail with fast transient response to burst imaging loads. Use Value: Burst Mode™ maintains >85% efficiency at 1mA standby current, extending capture time between charges. |
Use Scenario: Supplies high-voltage LCD bias (e.g., +12V/–10V) in mobile handsets using charge-pump-compatible topology. IC Role / Device Role / Timing Role: Primary 600kHz boost stage feeding external inverting charge pump; regulated via FB pin. Use Value: 300mV VCE(SAT) minimizes dropout loss, enabling full 12V output even at end-of-discharge (3.0V VIN). |
| GPS Receiver Battery Backup | Handheld Computer Core Rail |
Use Scenario: Maintains RTC and SRAM retention during main battery removal or deep discharge. IC Role / Device Role / Timing Role: Low-quiescent boost regulator converting depleted 1.8V backup cell to 3.3V system rail. Use Value: 140μA no-load IQ and ±2% LBI threshold ensure >1-year backup runtime with minimal false-low alerts. |
Use Scenario: Generates 3.3V core voltage for ARM-based processor from dual NiMH cells (2.4–3.0V). IC Role / Device Role / Timing Role: Primary DC/DC converter with soft-start support (via VC pin) to prevent brownout during boot. Use Value: Programmable compensation allows stable operation with low-ESR ceramic output caps, reducing board area vs. tantalum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1308BCF#TRPBF | Continuous switching mode (no Burst Mode™); 2.5mA quiescent current vs. 140μA | Better for noise-sensitive analog circuits where low-frequency ripple must be avoided | Select LT1308BCF#TRPBF when constant-frequency operation is required and battery life is secondary to EMI control. |
| MAX771CPA+ | 500kHz fixed frequency; 100μA shutdown current but no integrated low-battery detector | Lacks LBI/LBO functionality; requires external supervisor for battery monitoring | Choose MAX771CPA+ only if footprint compatibility with older designs is mandatory and low-battery detection is handled externally. |
Compared with LT1308BCF#TRPBF, the LT1308ACF#TRPBF trades higher light-load efficiency for low-frequency output ripple; compared with MAX771CPA+, it adds integrated battery monitoring at the cost of slightly larger TSSOP-14 footprint versus SO-8.
Availability
LT1308ACF#TRPBF is available at Aetrix Electronics and suitable for digital camera power supplies, GPS receiver battery backup systems, and handheld computer core rails requiring stable component supply across industrial temperature ranges (0°C to 70°C).
Supply support for LT1308ACF#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 technical and manufacturing continuity for legacy Linear power products.
The LT1308A family was designed specifically for high-efficiency, low-noise portable power conversion in space- and battery-life-constrained applications such as mobile communications and imaging equipment.
FAQ
What is the maximum output voltage achievable with the LT1308ACF#TRPBF?
The LT1308ACF#TRPBF supports boost converter outputs up to 34V, enabled by its 36V-rated internal NPN switch. This allows generation of 12V, 15V, or 24V rails from low-input sources like single Li-Ion or multi-cell alkaline batteries. Output voltage is set by the FB resistive divider, and stability must be verified with appropriate compensation on the VC pin for each configuration.
Does the LT1308ACF#TRPBF require an external compensation network?
Yes, the LT1308ACF#TRPBF requires an external RC network connected between the VC pin and ground to stabilize the feedback loop. Typical values are 47kΩ and 100pF. This network sets dominant pole location and phase margin; omitting it causes oscillation or poor transient response. Ceramic output capacitors demand careful tuning due to their near-zero ESR.
How does the low-battery detector function on the LT1308ACF#TRPBF?
The LT1308ACF#TRPBF integrates a precision low-battery detector with a ±2% 200mV internal reference. When the voltage at LBI falls below this threshold, the open-collector LBO pin pulls low (sinking up to 50μA). The detector remains active only when SHDN is high; grounding SHDN disables both regulation and detection, reducing current to ≤1μA.
Can the LT1308ACF#TRPBF start up into a precharged output capacitor?
Yes, the LT1308ACF#TRPBF can start up into heavy loads, including fully charged output capacitors. Unlike bootstrapped converters, it derives bias from VIN directly, enabling reliable startup even with 20Ω loads and 1.5V input. Measured inrush current reaches 3.5A during initial charging, confirming robust start-up capability without external soft-start circuitry.
What is the thermal performance difference between the SO-8 and TSSOP-14 packages for the LT1308ACF#TRPBF?
The LT1308ACF#TRPBF in TSSOP-14 achieves θJA = 80°C/W versus 190°C/W for the SO-8 variant, due to four dedicated GND pins acting as thermal vias and improved copper exposure. This 58% lower junction-to-ambient resistance allows sustained 1A operation at higher ambient temperatures or with reduced heatsinking, making it preferred for thermally dense portable designs.
LT1308ACF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LT1308ACF#TRPBF FAQ
1.How can I place an order for LT1308ACF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308ACF#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 LT1308ACF#TRPBF reliable?
The price and inventory of LT1308ACF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308ACF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1308ACF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308ACF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308ACF#TRPBF?
LT1308ACF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308ACF#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 LT1308ACF#TRPBF?
For technical support, including LT1308ACF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308ACF#TRPBF requirements.
6.How does Aetrix verify that LT1308ACF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1308ACF#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 LT1308ACF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1308ACF#TRPBF?
All LT1308ACF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308ACF#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 LT1308ACF#TRPBF part is unused and in its original packaging.
Return procedure for LT1308ACF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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