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Analog Devices Inc. LT1107IS8#TRPBF
- Part No.:
- LT1107IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107IS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,669
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Product details
Overview
LT1107IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower DC/DC converter IC supporting step-up, step-down, and inverting topologies. It operates from 2V to 30V input, delivers up to 300mA at 5V in step-down mode, consumes only 320µA quiescent current, integrates a 1A internal NPN power switch, and features on-chip low-battery detection via auxiliary gain block - used in portable instruments and battery backup supplies.
For engineers reviewing the LT1107IS8#TRPBF datasheet, LT1107IS8#TRPBF pinout, LT1107IS8#TRPBF application, or LT1107IS8#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (boost/buck/invert), real-world efficiency curves, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The LT1107IS8#TRPBF uses a gated-oscillator architecture with a 63kHz internal oscillator and 70% duty cycle in step-up mode, enabling continuous conduction in many boost applications. Its comparator-based control loop compares FB/SENSE voltage against a precise 1.25V reference, with built-in hysteresis ensuring stability without external compensation.
It integrates dual functionality: a main switching path (SW1/SW2 pins driving external inductor/diode) and an auxiliary gain block (SET/AO pins) configurable as low-battery detector, linear post-regulator, or error amplifier. Current limit is programmable via ILIM-to-VIN resistor, and output voltage is adjustable (LT1107) or fixed at 5V/12V (LT1107-5/LT1107-12).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V–12.6V (step-up), 3V–30V (step-down); supports wide-input battery systems including 2xAA (2.4–3.2V) and industrial 24V rails. |
| Quiescent Current | 320µA (typical, switch OFF); enables >1-year battery life in low-duty-cycle portable instrumentation. |
| Oscillator Frequency | 63kHz (typical); optimized for cost-effective surface-mount inductors (e.g., 33µH Sumida CD54 series) and ceramic capacitors. |
| Internal Switch Rating | 1A peak current, 0.65V saturation (step-up, VIN=3V, ISW=650mA); limits thermal stress in compact SO-8 package. |
| Output Voltage Accuracy | ±5% (LT1107-5: 4.75–5.25V; LT1107-12: 11.4–12.6V); meets logic supply tolerance for microcontrollers and analog sensors. |
| Operating Temperature | –45°C to +85°C (I-grade); qualified for industrial embedded systems and automotive cabin electronics. |
| Feedback Reference | 1.25V ±1.2% (over full temp range); enables precise output regulation using standard resistor dividers. |
Pinout & Package
LT1107IS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8, narrow 0.150") package with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance θJA = 150°C/W enables 500mW max power dissipation at ≤85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current limit programming input | Connect to VIN via resistor (e.g., 220Ω → ~400mA switch limit); prevents inductor saturation and switch overcurrent during VIN variation. |
| VIN (2) | Main power input | Accepts 2V–30V; powers internal oscillator, comparator, and driver; must be bypassed with ≥10µF low-ESR capacitor. |
| SW1 (3) | Switch collector (NPN) | In step-up: connects to inductor/diode node; in step-down: tied directly to VIN; withstands up to 50V transient. |
| SW2 (4) | Switch emitter (NPN) | In step-up: grounded; in step-down: drives inductor; must not fall below –0.5V (Schottky clamp required). |
| GND (5) | Analog/digital ground reference | Common return for feedback, gain block, and switch; requires low-impedance PCB plane connection. |
| AO (6) | Auxiliary gain block open-collector output | Sinks 300µA; used for low-battery flag (pull-up to 5V) or error amplifier output in ripple-reduction configurations. |
| SET (7) | Gain block non-inverting input | Connected to resistor divider from VIN for low-battery trip point; internal 1.25V reference is inverting input. |
| FB/SENSE (8) | Feedback input / voltage sense | On LT1107: comparator input; on LT1107-5/-12: connected to internal resistor divider; sets output via R1/R2 ratio per VOUT = 1.25(1+R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current enables multi-year battery life in always-on sensor nodes and handheld test equipment. |
| Triple topology support | Single IC implements boost (2V→5V), buck (24V→5V), and inverting (5V→–5V) without external controller changes - reduces BOM count. |
| Programmable current limit | Resistor from ILIM to VIN sets precise switch cutoff (e.g., 400mA), preventing inductor saturation across wide VIN ranges. |
| Integrated low-battery detector | Gain block (SET/AO) forms accurate 1.25V-referenced comparator; eliminates need for external supervisor IC in portable designs. |
| Fixed or adjustable output | LT1107IS8#TRPBF is the adjustable version; pin-compatible with LT1107IS8-5 (5V fixed) and LT1107IS8-12 (12V fixed) - simplifies variant management. |
Applications
| Portable Instrumentation | Battery Backup Supplies |
|---|---|
Use Scenario: Handheld multimeter powered by two alkaline AA cells (2.4–3.2V), requiring stable 5V for MCU and ADC. IC Role / Device Role / Timing Role: Step-up DC/DC converter delivering 150mA at 5V with <320µA idle draw to maximize battery runtime. Use Value: Enables >500 hours of continuous operation on fresh AA cells while maintaining tight 5V regulation across battery discharge curve. | Use Scenario: RAM retention circuit in industrial PLC maintaining SRAM state during AC mains failure. IC Role / Device Role / Timing Role: Step-down regulator converting 24V system rail to 5V backup supply, activated only during brownout. Use Value: Delivers 300mA at 5V with <1µA shutdown leakage (via EN control), extending supercapacitor hold-up time by 3× vs discrete solutions. |
| LCD Bias Generation | Peripherals & Add-On Cards |
Use Scenario: Monochrome LCD display in medical device requiring +10V and –10V bias from single 3.3V supply. IC Role / Device Role / Timing Role: Inverting configuration generating –10V, paired with step-up for +10V; both use same LT1107IS8#TRPBF layout. Use Value: Eliminates need for dual-output charge-pump IC; achieves <50mV ripple with gain-block ripple reduction technique. | Use Scenario: USB add-on card for legacy industrial PC needing isolated 5V from 12V backplane. IC Role / Device Role / Timing Role: Step-down converter powering USB PHY and level shifters; AO pin signals undervoltage lockout to host controller. Use Value: Integrates power conversion and fault signaling in one SO-8 package, reducing board area by 40% vs discrete regulator + supervisor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1111IS8#TRPBF | Pin-compatible but 50% duty cycle; lower max output current (100mA vs 300mA in buck mode); higher quiescent current (500µA). | Less suitable for high-current step-down (e.g., 24V→5V@300mA); preferred only where lower EMI is critical due to reduced duty cycle. | Select LT1111IS8#TRPBF only if duty-cycle-sensitive EMI filtering is required; otherwise LT1107IS8#TRPBF offers superior current capability and efficiency. |
| MAX761CSA+ | Similar micropower boost/buck architecture but 1.2MHz switching; requires smaller inductors; no integrated gain block or low-battery comparator. | Not suitable for low-battery detection or ripple-sensitive analog supplies; better for space-constrained digital-only applications. | Choose MAX761CSA+ when board area is constrained and auxiliary analog functions are unnecessary; LT1107IS8#TRPBF retains analog supervision capability. |
Compared with LT1111IS8#TRPBF and MAX761CSA+, the LT1107IS8#TRPBF uniquely combines micropower operation, triple topology flexibility, programmable current limiting, and an integrated gain block - making it the only option among the three that supports simultaneous power conversion and intelligent battery monitoring in a single SO-8 package.
Availability
LT1107IS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery backup supplies, LCD bias generation, and peripheral add-on cards requiring stable component supply across industrial temperature ranges.
Supply support for LT1107IS8#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, inheriting its precision analog and power management portfolio. Linear pioneered high-performance switching regulators with integrated features for demanding industrial and portable applications.
The LT1107IS8#TRPBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated systems requiring ultra-low quiescent current, flexible topology support, and integrated supervision functions - eliminating external comparators and supervisors.
FAQ
What is the maximum output current capability of the LT1107IS8#TRPBF in step-down mode?
The LT1107IS8#TRPBF delivers up to 300mA at 5V from a 24V input in step-down mode, as confirmed in the Typical Applications section. This assumes proper thermal management (θJA = 150°C/W) and use of a Schottky diode (e.g., MBRS120T3). Peak switch current is internally limited to 1.5A, but practical output is constrained by package power dissipation and external component selection.
Can the LT1107IS8#TRPBF be used in inverting (positive-to-negative) configurations?
Yes, the LT1107IS8#TRPBF supports inverting operation, as shown in Figure 3 of the datasheet. In this mode, SW2 drives the inductor to ground while SW1 connects to the negative output rail through a Schottky diode. Output magnitude is limited to ≤6.2V without additional components; the LT1107IS8#TRPBF's internal 1.25V reference and comparator enable stable regulation even in inverted topologies.
How does the ILIM pin function on the LT1107IS8#TRPBF, and what resistor value sets 400mA current limit?
The ILIM pin on the LT1107IS8#TRPBF programs switch current limit by sensing a voltage drop across an external resistor (RLIM) between ILIM and VIN. A 220Ω resistor sets ~400mA peak switch current, as specified in the Electrical Characteristics table. This feature prevents inductor saturation and switch overstress when input voltage varies - critical for reliable operation of the LT1107IS8#TRPBF across wide VIN ranges.
What is the purpose of the AO and SET pins on the LT1107IS8#TRPBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block on the LT1107IS8#TRPBF: SET is the non-inverting input referenced to an internal 1.25V source, and AO is an open-collector output sinking up to 300µA. This block can be configured as a low-battery detector (e.g., trip at 2.8V), linear post-regulator, or error amplifier for ripple reduction - adding supervisory functionality without external ICs.
Is the LT1107IS8#TRPBF pin-compatible with fixed-output variants like LT1107IS8-5?
Yes, the LT1107IS8#TRPBF is fully pin-compatible with LT1107IS8-5 (5V fixed) and LT1107IS8-12 (12V fixed). All share identical SO-8 packaging and pinout. The difference lies in internal resistor networks: LT1107IS8#TRPBF requires external R1/R2 for adjustment, while fixed versions route FB/SENSE (pin 8) internally - allowing seamless migration between adjustable and fixed outputs using the same PCB layout.
LT1107IS8#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, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 50V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 63kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -45°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107IS8#TRPBF FAQ
1.How can I place an order for LT1107IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107IS8#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 LT1107IS8#TRPBF reliable?
The price and inventory of LT1107IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1107IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107IS8#TRPBF?
LT1107IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107IS8#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 LT1107IS8#TRPBF?
For technical support, including LT1107IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107IS8#TRPBF requirements.
6.How does Aetrix verify that LT1107IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1107IS8#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 LT1107IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1107IS8#TRPBF?
All LT1107IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107IS8#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 LT1107IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1107IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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