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Analog Devices Inc. LT1107CS8-5#TRPBF
- Part No.:
- LT1107CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
LT1107CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter IC with fixed 5V output, internal 1A power switch, 63kHz oscillator, and on-chip low-battery detector comparator. It operates from 2V to 30V input, consumes only 320µA quiescent current, and delivers up to 300mA at 5V in step-down mode - ideal for battery-backed logic supplies in palmtop computers and portable instruments.
For engineers reviewing the LT1107CS8-5#TRPBF datasheet, LT1107CS8-5#TRPBF pinout, LT1107CS8-5#TRPBF application, or LT1107CS8-5#TRPBF equivalent, key selection criteria include its 70% duty cycle in step-up mode, user-adjustable current limit via ILIM pin, 5V ±2.5% output tolerance over temperature, SO-8 package compatibility, and ability to function without external feedback resistors due to integrated voltage-setting network.
Technical Context
The LT1107CS8-5#TRPBF uses a gated-oscillator architecture with a 1.25V internal reference and comparator-based regulation loop. Its 63kHz oscillator drives an NPN power switch with programmable current limit, enabling stable operation in discontinuous conduction mode across wide input ranges.
It supports three topologies: step-up (boost), step-down (buck), and inverting - with SW1 and SW2 pins configured as collector/emitter of the internal transistor. The fixed 5V version integrates precision resistor dividers on FB/SENSE (Pin 8), eliminating external components required for output setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2.5% (4.75V–5.25V) over 0°C to 70°C - ensures stable logic supply without trimming. |
| Input Voltage Range | 2V–12.6V (step-up), up to 30V (step-down) - supports single-cell alkaline (2×AA) and industrial 24V rails. |
| Quiescent Current | 320µA (typical, no load, step-up) - enables >1-year battery life in low-duty-cycle portable systems. |
| Oscillator Frequency | 63kHz (typical) - optimized for surface-mount inductors and minimizes EMI vs higher-frequency alternatives. |
| Switch Current Limit | Programmable up to 1.5A via ILIM-to-VIN resistor - prevents inductor saturation and switch overstress during input transients. |
| Duty Cycle | 64–76% (full load, step-up) - enables high output current in boost configurations where VOUT ≈ 3×VIN. |
| Operating Temperature | 0°C to 70°C (Commercial grade) - validated for consumer and industrial embedded applications. |
Pinout & Package
LT1107CS8-5#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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current limit programming input | Connect to VIN directly (no limit) or via resistor to set switch current threshold - critical for wide-input-range designs. |
| VIN (2) | Main power input | Accepts 2V–30V; powers internal circuitry and switch - must be decoupled with ≥10µF ceramic capacitor. |
| SW1 (3) | Power switch collector | In step-up: connects to inductor/diode; in step-down: connects to VIN - handles full switch current and voltage stress. |
| SW2 (4) | Power switch emitter | In step-up: grounded; in step-down: drives inductor - must not fall below –0.5V to avoid latch-up. |
| GND (5) | Analog and power ground | Common return for feedback, gain block, and switch - requires low-impedance PCB connection to minimize noise. |
| AO (6) | Auxiliary gain block open-collector output | Sinks 300µA; used for low-battery detection, post-regulation, or undervoltage lockout - requires pull-up resistor. |
| SET (7) | Gain block non-inverting input | Accepts resistor divider from VIN to configure trip point for comparator functions - bias current <300nA. |
| FB/SENSE (8) | Feedback input / fixed-voltage sense node | Internally connected to 5V divider in -5 variant - connect directly to output for regulation; no external resistors needed. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current enables multi-year battery life in always-on monitoring systems. |
| Three-component topology | Only inductor, diode, and output capacitor required - reduces BOM cost and board space vs controller+MOSFET solutions. |
| On-chip low-battery detector | Comparator with 1.25V reference and 12.5mV hysteresis - eliminates need for external supervisor IC in portable devices. |
| Configurable topology support | Single IC supports boost, buck, and inverting modes via pin wiring - simplifies design reuse across power architectures. |
| Internal 1A power switch | NPN transistor with 0.65V saturation voltage at 650mA - avoids external MOSFET gate drive complexity and layout sensitivity. |
Applications
| Palmtop Computer Logic Supply | 24V to 5V Industrial Converter |
|---|---|
Use Scenario: Generating clean 5V logic rail from two AA alkaline cells (2.0–3.2V) in handheld computing devices with strict battery-life requirements. IC Role / Device Role / Timing Role: Micropower DC/DC converter operating in step-up mode with gated oscillator control and internal 5V feedback divider. Use Value: Delivers 150mA at 5V with 320µA quiescent current, extending battery runtime beyond 12 months in typical usage. | Use Scenario: Converting unregulated 24V industrial bus to stable 5V for microcontroller peripherals in factory automation equipment. IC Role / Device Role / Timing Role: Step-down regulator using SW1 tied to VIN and SW2 driving inductor, leveraging 30V max input rating and 70°C commercial temp range. Use Value: Provides 300mA at 5V with no external feedback components, reducing design risk and qualification time for industrial OEMs. |
| LCD Bias Generator | Battery Backup Supply |
Use Scenario: Generating regulated 5V bias for monochrome LCD modules in medical handhelds powered by rechargeable Li-ion cells (3.0–4.2V). IC Role / Device Role / Timing Role: Boost converter with adjustable current limit to prevent inductor saturation during cold-start conditions. Use Value: Maintains 5V output within ±2.5% across input range and temperature, ensuring consistent LCD contrast and readability. | Use Scenario: Providing fail-safe 5V backup power to real-time clocks and SRAM during main supply interruption in telecom infrastructure. IC Role / Device Role / Timing Role: Low-quiescent-current step-down regulator with AO pin configured as undervoltage lockout signal. Use Value: Draws only 320µA when idle and asserts AO low upon main rail collapse - enabling seamless switchover with minimal hold-up capacitance. |
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 |
|---|---|---|---|
| LTC1983ES6-5#TRMPBF | Higher efficiency (up to 88%), 1.5MHz switching, SOT-23-6 package, but 600µA quiescent current. | Better suited for space-constrained, high-efficiency designs; less optimal for ultra-low-power battery longevity. | Select LTC1983ES6-5#TRMPBF when board area is critical and input voltage is stable; retain LT1107CS8-5#TRPBF for longest battery life and wide-input flexibility. |
| MAX761CSA+T | Fixed 5V output, 300kHz oscillator, 100µA quiescent current, but only supports step-up mode and lacks current limit programming. | Optimized for low-noise boost-only applications; cannot replace LT1107CS8-5#TRPBF in buck or inverting topologies. | Choose MAX761CSA+T for simple boost converters where lowest IQ is paramount and topology is fixed; use LT1107CS8-5#TRPBF when multi-mode operation or current limiting is required. |
Compared with LTC1983ES6-5#TRMPBF and MAX761CSA+T, the LT1107CS8-5#TRPBF uniquely balances ultra-low quiescent current, multi-topology support, and programmable current limiting - making it the only option capable of delivering 300mA at 5V from 24V input while maintaining sub-1mA standby draw.
Availability
LT1107CS8-5#TRPBF is available at Aetrix Electronics and suitable for palmtop computer logic supplies, 24V-to-5V industrial converters, LCD bias generation, and battery backup systems requiring stable component supply and long-term manufacturability.
Supply support for LT1107CS8-5#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, documentation, and manufacturing continuity for legacy Linear parts including the LT1107 family.
The LT1107 series was designed as a versatile micropower DC/DC converter platform targeting battery-operated portable electronics, offering configurable topology, integrated power switch, and ultra-low IQ - distinguishing it from dedicated boost or buck controllers.
FAQ
What is the maximum output current capability of the LT1107CS8-5#TRPBF in step-down mode?
The LT1107CS8-5#TRPBF delivers up to 300mA at 5V when operating in step-down mode from a 24V input, as confirmed in the Typical Applications section. This assumes proper thermal management, use of a Schottky diode, and an appropriately sized inductor (e.g., 56µH). Peak switch current is internally limited to 1.5A, but continuous output is constrained by power dissipation and inductor saturation limits.
Does the LT1107CS8-5#TRPBF require external feedback resistors to set the 5V output?
No, the LT1107CS8-5#TRPBF does not require external feedback resistors. As a fixed-output variant, it integrates precision on-chip resistor dividers connected to the FB/SENSE (Pin 8) terminal. This pin must be connected directly to the output node to complete the regulation loop - eliminating component count and calibration uncertainty compared to adjustable versions like the LT1107.
Can the LT1107CS8-5#TRPBF operate from a single 1.5V alkaline cell?
No, the LT1107CS8-5#TRPBF cannot operate from a single 1.5V alkaline cell. Its minimum input voltage is 2V in step-up mode, as specified in the Absolute Maximum Ratings table. Two AA cells (2.0–3.2V) are the minimum viable source, providing sufficient headroom for the internal switch saturation voltage and oscillator startup margin.
What is the purpose of the AO and SET pins on the LT1107CS8-5#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 bandgap, and AO is an open-collector output that sinks up to 300µA. Together they enable low-battery detection, linear post-regulation, or undervoltage lockout - for example, connecting a resistor divider from VIN to SET allows AO to assert low when battery voltage drops below a user-defined threshold.
Is the LT1107CS8-5#TRPBF pin-compatible with the LT1111?
Yes, the LT1107CS8-5#TRPBF is pin-for-pin compatible with the LT1111 in the same SO-8 package, as explicitly stated in the Features section. However, the LT1107CS8-5#TRPBF uses a 70% duty cycle versus the LT1111's lower duty cycle, enabling higher output current in many step-up applications - a functional improvement without layout changes.
LT1107CS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LT1107CS8-5#TRPBF FAQ
1.How can I place an order for LT1107CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CS8-5#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 LT1107CS8-5#TRPBF reliable?
The price and inventory of LT1107CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1107CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CS8-5#TRPBF?
LT1107CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CS8-5#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 LT1107CS8-5#TRPBF?
For technical support, including LT1107CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1107CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1107CS8-5#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 LT1107CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1107CS8-5#TRPBF?
All LT1107CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CS8-5#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 LT1107CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1107CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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