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Analog Devices Inc. LT1107CS8#TRPBF
- Part No.:
- LT1107CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
LT1107CS8#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, features an internal 1A power switch, and uses a fixed 63kHz oscillator. It is used in battery-backed supplies and portable instruments requiring ultra-low standby power.
For engineers reviewing the LT1107CS8#TRPBF datasheet, LT1107CS8#TRPBF pinout, LT1107CS8#TRPBF application, or LT1107CS8#TRPBF equivalent, key selection criteria include its 70% duty cycle in step-up mode, user-adjustable current limit via ILIM pin, on-chip low-battery detector comparator, 8-pin SOIC package, and compatibility with surface-mount inductors and capacitors.
Technical Context
The LT1107CS8#TRPBF implements a gated-oscillator architecture where the 63kHz oscillator activates only when the feedback voltage drops below the 1.25V internal reference, enabling 320µA quiescent current. Its NPN power switch supports both step-up (SW1 drives inductor, SW2 grounded) and step-down (SW1 tied to VIN, SW2 drives inductor) configurations.
Current limiting is achieved by sensing switch current through a ratioed transistor and external resistor between ILIM and VIN; trip point is programmable down to ~400mA. The auxiliary gain block (AO/SET pins) functions as a configurable op-amp for low-battery detection, linear post-regulation, or ripple reduction - not a dedicated error amplifier in closed-loop regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V–12.6V (step-up), 30V max (step-down); enables single-cell alkaline (2×AA) to 5V and 24V industrial rails to 5V conversion |
| Quiescent Current | 320µA (typical, switch OFF); critical for multi-year battery life in palmtop computers and portable instruments |
| Oscillator Frequency | 63kHz (typical); optimized for cost-effective surface-mount inductors (e.g., 33µH Sumida CD54) and ceramic capacitors |
| Max Switch Current | 1.5A (absolute max); internal NPN switch rated for continuous 650mA in step-down mode without external heatsinking |
| Duty Cycle | 70% (step-up, full load); higher than LT1111's 60%, enabling greater output current in boost applications |
| Output Voltage Accuracy | ±5% (LT1107-5: 4.75–5.25V; LT1107-12: 11.4–12.6V); fixed versions use on-chip resistors - no external FB divider needed |
| Operating Temp Range | 0°C to 70°C (C-grade); suitable for commercial portable equipment, not extended industrial or automotive environments |
Pinout & Package
LT1107CS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package, 150-mil width, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current Limit Programming Input | Connect to VIN directly for full 1.5A switch current; add resistor to VIN to set precise trip point (e.g., 220Ω → ~400mA) |
| VIN (2) | Main Power Input | Supplies internal circuitry and power switch; accepts 2V–30V depending on topology |
| SW1 (3) | Power Switch Collector | In step-up: connects to inductor/diode node; in step-down: tied to VIN rail |
| SW2 (4) | Power Switch Emitter | In step-up: grounded; in step-down: drives inductor; must not fall below –0.5V |
| GND (5) | Analog & Power Ground | Common return for feedback, gain block, and switch emitter; requires low-impedance layout |
| AO (6) | Auxiliary Gain Block Output | Open-collector NPN output sinking up to 300µA; used for low-battery flag or error signal |
| SET (7) | Gain Block Non-Inverting Input | Accepts resistor-divider from VIN for programmable low-battery threshold referenced to 1.25V |
| FB/SENSE (8) | Feedback Input / Fixed-Voltage Sense | On LT1107 (adjustable): comparator input; on LT1107-5/-12: connected to internal resistor divider for 5V/12V regulation |
Key Features
| Feature | Design Value |
|---|---|
| Three-external-component operation | Enables minimal BOM for 5V/12V fixed-output converters - only inductor, diode, and output capacitor required |
| On-chip low-battery detector comparator | 1.25V reference with 12.5mV hysteresis allows reliable undervoltage lockout using two external resistors on SET pin |
| User-adjustable current limit | Single resistor between ILIM and VIN sets switch cutoff current, preventing inductor saturation and switch overstress across wide VIN ranges |
| Internal 1A power switch | Integrated NPN transistor eliminates need for external switch in ≤300mA step-down or ≤150mA step-up designs |
| Space-saving SO-8 package | 8-pin narrow-body SOIC footprint (150-mil width) supports high-density PCB layouts in portable electronics |
Applications
| Palmtop Computer Logic Supply | 24V to 5V Industrial Converter |
|---|---|
Use Scenario: Generating stable 5V logic supply from two AA alkaline cells (2.0–3.2V) in handheld computing devices. IC Role / Device Role / Timing Role: Micropower step-up DC/DC converter with gated oscillator controlling internal NPN switch. Use Value: 320µA quiescent current extends battery life to >1 year; 150mA output supports CPU, display, and I/O without external switch. | Use Scenario: Converting 24V industrial bus to regulated 5V for microcontroller peripherals in factory automation systems. IC Role / Device Role / Timing Role: Step-down (buck) regulator using SW1-to-VIN and SW2-to-inductor configuration. Use Value: Delivers 300mA at 5V with no external pass transistor; 70°C operating range matches commercial PLC module requirements. |
| LCD Bias Generator | Battery Backup Supply |
Use Scenario: Generating negative bias voltage (e.g., –5V) for LCD segment drivers in portable test equipment. IC Role / Device Role / Timing Role: Inverting converter with SW2 grounded and SW1 driving inductor to generate inverted output. Use Value: Single-chip solution avoids dual-rail supplies; Schottky diode requirement ensures low forward drop and fast recovery. | Use Scenario: Maintaining real-time clock (RTC) and SRAM backup during main power failure in embedded systems. IC Role / Device Role / Timing Role: Low-quiescent-current step-up converter activated only when main supply drops below threshold. Use Value: On-chip comparator and AO output enable autonomous switchover; 320µA draw minimizes primary battery drain during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1111CS8#TRPBF | Same pinout, 60% max duty cycle, higher 500µA quiescent current, no AO/SET gain block | Lacks auxiliary comparator/gain functionality; unsuitable for low-battery detection or ripple reduction | Select LT1107CS8#TRPBF when current limit programming or integrated comparator functionality is required |
| MAX761CSA+ | Pin-compatible step-up-only converter; 300µA IQ; fixed 5V output; no step-down/inverting support | Restricted to boost topology; no adjustable output or ILIM programming | Choose LT1107CS8#TRPBF for multi-topology flexibility and programmable current limit |
Compared with LT1111CS8#TRPBF and MAX761CSA+, the LT1107CS8#TRPBF uniquely combines three-converter topology support, user-programmable current limit, and an auxiliary gain block - enabling single-chip solutions for battery monitoring, ripple reduction, and wide-input-range regulation without external op-amps or comparators.
Availability
LT1107CS8#TRPBF is available at Aetrix Electronics and suitable for palmtop computers, 24V-to-5V industrial converters, LCD bias generators, and battery backup supplies requiring stable component supply and long-term obsolescence management.
Supply support for LT1107CS8#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, datasheets, and application notes for legacy Linear parts including the LT1107 family.
The LT1107 series was designed as a versatile micropower switching regulator targeting battery-operated portable electronics, offering topology flexibility (boost/buck/invert), ultra-low IQ, and integrated protection features - distinguishing it from fixed-function or higher-power alternatives.
FAQ
What is the maximum output current capability of the LT1107CS8#TRPBF in step-down mode?
The LT1107CS8#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 design and use of a Schottky diode. Peak switch current is limited to ~650mA in this configuration to maintain efficiency and avoid saturation; higher loads require external switching stages.
Does the LT1107CS8#TRPBF support adjustable output voltage?
Yes, the base LT1107CS8#TRPBF supports adjustable output voltage via external resistor divider on the FB/SENSE pin, with regulation based on the internal 1.25V reference. Fixed-output variants (LT1107CS8-5#TRPBF, LT1107CS8-12#TRPBF) integrate the divider and require FB/SENSE connected directly to VOUT - no external resistors needed.
Can the LT1107CS8#TRPBF be used in inverting (positive-to-negative) configurations?
Yes, the LT1107CS8#TRPBF supports inverting operation as documented in Figures 3 and 4 of the datasheet. In positive-to-negative mode, SW2 is grounded and SW1 drives the inductor, with output referenced to ground. Output magnitude should be ≤6.2V unless modified with external diodes; Schottky diodes are mandatory for safe operation.
What is the purpose of the AO and SET pins on the LT1107CS8#TRPBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block: SET is the non-inverting input referenced to the internal 1.25V, and AO is an open-collector output sinking up to 300µA. This block can be configured as a low-battery detector, linear post-regulator, or ripple-reduction amplifier - extending functionality beyond basic regulation.
Is the LT1107CS8#TRPBF pin-compatible with other members of the LT1107 family?
Yes, all LT1107 variants - including LT1107CS8#TRPBF, LT1107CS8-5#TRPBF, LT1107CS8-12#TRPBF, and LT1107IS8#TRPBF - share identical SO-8 pinouts and electrical pin functions. Differences lie only in output voltage configuration (adjustable vs. fixed) and temperature grade (C-grade vs. I-grade), not pin mapping or package.
LT1107CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107CS8#TRPBF FAQ
1.How can I place an order for LT1107CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CS8#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 LT1107CS8#TRPBF reliable?
The price and inventory of LT1107CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1107CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CS8#TRPBF?
LT1107CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CS8#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 LT1107CS8#TRPBF?
For technical support, including LT1107CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CS8#TRPBF requirements.
6.How does Aetrix verify that LT1107CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1107CS8#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 LT1107CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1107CS8#TRPBF?
All LT1107CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CS8#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 LT1107CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1107CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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