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Analog Devices Inc. LT1073CS8#TRPBF
- Part No.:
- LT1073CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1073CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
LT1073CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter IC with internal 1A power switch, adjustable output voltage (via external resistor divider), and on-chip auxiliary gain block for low-battery detection. It operates from 1V to 30V input, delivers up to 40mA at 5V from 1.25V input, and consumes only 95µA quiescent current in shutdown - ideal for single-cell alkaline/NiCd-powered portable instruments and battery backup supplies.
For engineers reviewing the LT1073CS8#TRPBF datasheet, LT1073CS8#TRPBF pinout, LT1073CS8#TRPBF application, or LT1073CS8#TRPBF equivalent, key selection criteria include minimum 1V start-up capability, user-adjustable current limit via ILIM pin, reverse-battery protection to –1.6V, gated-oscillator architecture for ultra-low idle current, and compatibility with SO-8 PCB layouts requiring minimal external components (3 off-the-shelf parts for fixed-output configurations).
Technical Context
The LT1073CS8#TRPBF uses a gated-oscillator topology where the 19kHz internal oscillator activates only when FB voltage falls below 212mV reference, minimizing quiescent current. Its NPN power switch features adaptive base drive for saturation without overdrive, achieving high efficiency across wide input ranges.
It integrates dual functional blocks: a comparator-based regulation loop controlling SW1/SW2 switching, and an independent PNP-input gain block (SET/AO pins) configurable as low-battery detector or linear post-regulator. The ILIM pin enables precise current limiting via external resistor, critical for stable operation under varying VIN or continuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 30V (step-up); 3V to 36V (step-down) - supports single-cell alkaline (1.0–1.5V) and multi-cell/TTL supply inputs. |
| Output Configuration | Adjustable via external R1/R2 divider (VOUT = 212mV × (1 + R2/R1)) - enables custom voltages including 5V/12V without changing IC. |
| Quiescent Current | 95µA (shutdown), 135µA (LT1073-5 typical unloaded) - extends battery life in always-on sensor nodes and handheld devices. |
| Switch Current Limit | User-adjustable up to 1.5A (ILIM tied to VIN) or ~400mA (220Ω from ILIM to VIN) - prevents inductor saturation and switch overstress. |
| Oscillator Frequency | 15–23kHz (typ. 19kHz) with 38µs ON / 15µs OFF timing - optimized for 1.5V→5V boost ratio; reduces EMI vs higher-frequency alternatives. |
| Reverse Battery Protection | Limits reverse current to ≤750mA at –1.6V applied to GND/SW2 - protects circuitry during battery insertion error or polarity reversal. |
| Operating Temperature | 0°C to 70°C - suitable for commercial portable equipment, not extended industrial or automotive environments. |
Pinout & Package
LT1073CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant and tape-and-reel packaged (#TRPBF suffix). Pin 1 (ILIM) sets current limit; Pin 8 (FB/SENSE) connects to feedback divider; Pin 6 (AO) provides open-collector output for low-battery signaling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current limit programming input | Voltage drop across external resistor determines switch turn-off threshold - enables safe operation across wide VIN ranges. |
| VIN (2) | Main power supply input | Accepts 1V–30V (boost) or 3V–36V (buck); powers internal reference, oscillator, and driver circuits. |
| SW1 (3) | Collector of internal NPN switch | In boost mode: drives inductor; in buck mode: tied to VIN - defines primary power path topology. |
| SW2 (4) | Emiter of internal NPN switch | In boost mode: grounded; in buck mode: drives inductor - must not fall below –0.4V to avoid damage. |
| GND (5) | Analog and power ground reference | Common return for internal circuitry, feedback network, and external components - requires low-impedance layout. |
| A0 (6) | Auxiliary gain block open-collector output | Sinks 100µA max; used for low-battery flag or driving external logic - requires pull-up resistor (e.g., 56kΩ to 5V). |
| SET (7) | Gain block non-inverting input | Connects to resistor divider from VIN to set low-battery trip point referenced to internal 212mV. |
| FB/SENSE (8) | Feedback input / voltage sense node | Compares divided output against 212mV reference; in fixed versions (e.g., LT1073CS8-5), internally connected to precision resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower gated-oscillator architecture | Reduces average supply current to 95µA in idle state - enables >1-year battery life in low-duty-cycle IoT sensors. |
| Single-cell 1V start-up capability | Operates from depleted alkaline/NiCd cells down to 1.0V - eliminates need for voltage booster pre-regulators in space-constrained designs. |
| Integrated auxiliary gain block (SET/AO) | Configurable as low-battery detector (trip at 202–222mV) or linear post-regulator - removes need for external comparator or op-amp. |
| User-programmable current limit | External resistor on ILIM pin sets switch cutoff at precise current (e.g., 400mA with 220Ω) - prevents thermal runaway during input transients. |
| Reverse-battery protection | Clamps reverse current to non-destructive levels (<750mA) at –1.6V - safeguards downstream circuitry during field maintenance or battery replacement. |
| Flexible topology support | Native step-up, step-down, and inverting configurations using same IC - reduces BOM count and simplifies design reuse across product variants. |
Applications
| Pagers | Single-Cell to 5V Converters |
|---|---|
Use Scenario: Power management in legacy two-way pagers with tight space constraints and single AA/AAA battery supply. IC Role / Device Role / Timing Role: Primary DC/DC converter regulating 5V rail for RF front-end and microcontroller from 1.0–1.5V alkaline cell. Use Value: 135µA unloaded quiescent current extends operational time between battery changes; 8-pin SOIC footprint minimizes PCB area. |
Use Scenario: Converting voltage from a single NiCd or alkaline cell (1.0–1.5V) to stable 5V for microcontroller logic and sensors. IC Role / Device Role / Timing Role: Adjustable boost converter with external R1/R2 feedback network setting exact 5V output despite cell voltage decay. Use Value: 1V minimum start-up ensures functionality even with deeply discharged batteries; reverse-battery protection prevents damage during incorrect insertion. |
| Battery Backup Supplies | Portable Instruments |
Use Scenario: Maintaining real-time clock (RTC) and SRAM retention during main power failure in industrial controllers. IC Role / Device Role / Timing Role: Low-quiescent-current step-up converter delivering regulated 3.3V/5V from backup coin cell or supercapacitor. Use Value: 95µA shutdown current maximizes backup runtime; integrated low-battery detector (via AO pin) triggers system save before power loss. |
Use Scenario: Powering handheld multimeters, particle detectors, or gas analyzers operating from disposable alkaline batteries. IC Role / Device Role / Timing Role: Dual-role IC providing both main 5V system rail and auxiliary low-battery warning signal to MCU. Use Value: Single-component solution replaces discrete regulator + comparator; SO-8 package allows compact, automated assembly. |
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 |
|---|---|---|---|
| MAX761CSA+ | Fixed 5V/12V output only; no adjustable version; 100µA quiescent current; requires external diode. | Lacks ILIM current limiting and auxiliary gain block - unsuitable for low-battery detection or variable output needs. | Choose for cost-sensitive, fixed-voltage designs where external diode placement is acceptable and gain block functionality is unnecessary. |
| TPS61200DRCR | Higher 3.3MHz switching frequency; 50µA quiescent current; integrated Schottky diode; 0.3V start-up. | Superior light-load efficiency and smaller external components, but lacks reverse-battery protection and analog gain block. | Prefer for ultra-low-power, space-constrained applications needing <0.5V start-up; avoid where reverse-polarity resilience or AO-based monitoring is required. |
Compared with MAX761CSA+ and TPS61200DRCR, the LT1073CS8#TRPBF uniquely combines 1V start-up, programmable current limit, reverse-battery protection, and an integrated gain block - making it irreplaceable in legacy single-cell systems requiring robustness, configurability, and analog monitoring without added components.
Availability
LT1073CS8#TRPBF is available at Aetrix Electronics and suitable for pagers, single-cell to 5V converters, battery backup supplies, portable instruments, and handheld inventory computers requiring stable component supply with long-term lifecycle support.
Supply support for LT1073CS8#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 support, datasheet archives, and product continuity for the LT® family of precision analog and power ICs.
The LT1073CS8#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated portable equipment where ultra-low quiescent current, wide input range, and topology flexibility are critical.
FAQ
What is the minimum input voltage required for LT1073CS8#TRPBF to start switching?
The LT1073CS8#TRPBF guarantees operation down to 1.0V input in step-up mode, enabling use with nearly depleted single-cell alkaline or NiCd batteries. Startup is confirmed at 1.15V (min) per datasheet; performance degrades gradually below this, but functional regulation begins as low as 1.0V with appropriate inductor and capacitor selection. This 1V capability is a defining feature distinguishing LT1073CS8#TRPBF from most competing boost converters.
Can LT1073CS8#TRPBF be used in step-down (buck) configuration?
Yes, the LT1073CS8#TRPBF supports step-down operation by reconfiguring SW1 and SW2 connections: SW1 ties to VIN, SW2 drives the inductor. It regulates outputs up to 6.2V in buck mode with short-circuit protection inherent to the topology. Input voltage must exceed 3V for reliable step-down use, and output ripple remains low due to continuous inductor current - a key advantage over boost-only alternatives. The LT1073CS8#TRPBF datasheet provides verified schematics and component values for buck implementation.
How does the ILIM pin on LT1073CS8#TRPBF control switch current?
The ILIM pin on LT1073CS8#TRPBF senses voltage drop across an external resistor connected between ILIM and VIN. When this drop reaches ~0.6V (one VBE), the internal current-limit circuit terminates the switch ON cycle. A 220Ω resistor sets ~400mA limit; direct connection to VIN enables the full 1.5A rating. This real-time, analog current limiting prevents inductor saturation and thermal stress - a feature absent in many micropower converters. The LT1073CS8#TRPBF's ILIM response has ~2µs propagation delay, ensuring fast protection.
What is the function of the AO and SET pins on LT1073CS8#TRPBF?
The AO (pin 6) and SET (pin 7) pins implement the LT1073CS8#TRPBF's auxiliary gain block: SET is the non-inverting input referenced to an internal 212mV bandgap, and AO is its open-collector output sinking up to 100µA. Configured as a low-battery detector, a resistor divider from VIN to GND on SET generates a trip point (e.g., 1.2V); AO pulls low when triggered. As a linear post-regulator, AO drives an external pass transistor. This dual functionality eliminates need for separate comparators or op-amps in the LT1073CS8#TRPBF system design.
Does LT1073CS8#TRPBF include reverse-battery protection, and how does it work?
Yes, LT1073CS8#TRPBF incorporates dedicated reverse-battery protection that limits reverse current to ≤750mA when –1.6V is applied to GND and SW2 pins (with VIN, ILIM, SW1 grounded). This is achieved through internal circuitry that clamps reverse conduction paths, preventing destructive power dissipation during accidental battery reversal. Unlike simple series diodes, this protection adds no forward voltage drop in normal operation - preserving efficiency. The LT1073CS8#TRPBF datasheet specifies this behavior under Absolute Maximum Ratings and Electrical Characteristics.
LT1073CS8#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
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 50V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 19kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1073CS8#TRPBF FAQ
1.How can I place an order for LT1073CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1073CS8#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 LT1073CS8#TRPBF reliable?
The price and inventory of LT1073CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1073CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1073CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1073CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1073CS8#TRPBF?
LT1073CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1073CS8#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 LT1073CS8#TRPBF?
For technical support, including LT1073CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1073CS8#TRPBF requirements.
6.How does Aetrix verify that LT1073CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1073CS8#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 LT1073CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1073CS8#TRPBF?
All LT1073CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1073CS8#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 LT1073CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1073CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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