My Inquiry
My Account
Analog Devices Inc. LT1073CN8#PBF
- Part No.:
- LT1073CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1073CN8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,478
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1073CN8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter IC with internal 1A NPN power switch, adjustable output voltage (via external resistor divider), and on-chip auxiliary gain block for low-battery detection or linear post-regulation. 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 instrumentation.
For engineers reviewing the LT1073CN8#PBF datasheet, LT1073CN8#PBF pinout, LT1073CN8#PBF application, or LT1073CN8#PBF 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 8-pin PDIP packaging for through-hole prototyping and legacy industrial designs.
Technical Context
The LT1073CN8#PBF implements a gated-oscillator switching architecture where the 19kHz oscillator activates only when FB voltage falls below the 212mV internal reference, minimizing quiescent current. Its adaptive base drive ensures switch saturation without overdrive, optimizing efficiency across input ranges.
It integrates dual functional blocks: a comparator-controlled PWM switch driver (SW1/SW2 pins) and a standalone PNP-input gain block (SET/AO pins) with 212mV reference tied to its inverting input - enabling configurable low-battery detection or ripple-reduction preamplification at the FB node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 30V (step-up mode); enables operation from single 1.0V NiCd cell or up to 30V industrial rails |
| Quiescent Current | 95µA (switch off); ensures >1-year battery life in low-duty-cycle sensor nodes |
| Switch Current Limit | Programmable up to 1.5A via ILIM pin resistor; prevents inductor saturation and switch overstress |
| Oscillator Frequency | 15–23kHz (typ. 19kHz); fixed frequency simplifies EMI filtering vs. variable-frequency alternatives |
| Output Voltage Accuracy | ±5% (LT1073 variant); determined by external R1/R2 divider referenced to 212mV internal bandgap |
| Reverse Battery Protection | Limits reverse current to ≤750mA at –1.6V; protects circuitry during battery insertion error |
| Operating Temperature | 0°C to 70°C; validated for commercial-grade portable equipment environments |
Pinout & Package
LT1073CN8#PBF is housed in an 8-lead plastic DIP (PDIP) package (N8), compatible with through-hole assembly and breadboard evaluation. Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current limit programming input | Resistor between ILIM and VIN sets peak switch current; 220Ω yields ~400mA limit |
| VIN (2) | Main power supply input | Accepts 1V–30V; powers internal reference, oscillator, and driver circuits |
| SW1 (3) | Collector of internal NPN switch | In step-up: connects to inductor/diode; in step-down: ties to VIN |
| SW2 (4) | Emitter of internal NPN switch | In step-up: grounds switch emitter; in step-down: drives inductor load |
| GND (5) | Analog and power ground reference | Common return for feedback, gain block, and switch emitter |
| A0 (6) | Open-collector auxiliary amplifier output | Sinks 100µA; used for low-battery flag or active ripple reduction |
| SET (7) | Non-inverting input of gain block | With internal 212mV reference on inverting input, forms comparator or op-amp stage |
| FB/SENSE (8) | Feedback input / voltage sense node | Compares against 212mV reference; sets output via external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Micropower gated-oscillator control | Reduces average supply current to 95µA in idle state - critical for multi-year battery life |
| Single-cell 1V start-up capability | Enables direct use with discharged NiCd or alkaline cells without boost pre-regulator |
| Integrated 1A NPN power switch | Eliminates external transistor and base-drive circuitry, reducing BOM count and layout area |
| On-chip 212mV precision reference | Stable reference for both FB comparator and SET gain block - ensures consistent trip points |
| User-programmable current limit | Prevents destructive inductor saturation and switch failure under wide VIN or transient loads |
| Reverse-battery protection | Clamps reverse current to non-destructive levels even at –1.6V applied to GND/SW2 |
Applications
| Pagers & Cellular Handsets | Single-Cell to 5V Portable Instruments |
|---|---|
Use Scenario: Power management in compact, battery-constrained wireless communication devices requiring regulated 5V from aging alkaline cells. IC Role / Device Role / Timing Role: Primary DC/DC converter providing stable 5V rail for RF front-end and baseband ICs; operates in step-up mode with 1.25V–1.5V input. Use Value: 135µA unloaded supply current extends talk time; reverse-battery protection prevents damage during battery swaps. |
Use Scenario: Powering handheld test meters, particle detectors, or barcode scanners powered by one AA/AAA cell. IC Role / Device Role / Timing Role: Adjustable-output boost converter delivering 5V at 10–40mA; configured with external R1/R2 for precise voltage setting. Use Value: 1V minimum start-up allows full utilization of cell capacity; low quiescent current enables months of standby operation. |
| Battery Backup Supplies | 4–20mA Loop-Powered Sensors |
Use Scenario: Maintaining SRAM or real-time clock operation during main power loss in industrial controllers. IC Role / Device Role / Timing Role: Standby DC/DC converter activated when primary supply drops; uses AO pin as undervoltage lockout signal. Use Value: Gain block (SET/AO) provides clean, hysteresis-controlled low-battery flag to microcontroller without external comparators. |
Use Scenario: Generating isolated 5V or 12V bias from 4–20mA loop for sensor signal conditioning in hazardous-area transmitters. IC Role / Device Role / Timing Role: Step-up converter operating from low-voltage loop drop (e.g., 3.5V); uses ILIM pin to constrain peak current within loop compliance. Use Value: Programmable current limit ensures converter does not exceed 20mA loop ceiling during startup or fault conditions. |
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 |
|---|---|---|---|
| MAX630CPA+ | Fixed 5V output only; no adjustable version; 120µA quiescent current; requires external diode | Lacks ILIM pin, gain block, and reverse-battery protection; limited to fixed-VOUT step-up | Choose for cost-sensitive, fixed-5V-only designs where programmability and protection are unnecessary |
| TPS61200DRCR | Higher 3.3MHz switching frequency; 1.8V–5.5V input; integrated Schottky; 90µA quiescent current | Requires minimum 1.8V input - cannot start from 1.0V NiCd; no reverse-battery protection | Prefer for modern Li-ion or coin-cell applications needing smaller inductors and lower profile, but not for true 1V operation |
Compared with MAX630CPA+ and TPS61200DRCR, the LT1073CN8#PBF uniquely supports 1V start-up, on-chip current limiting, reverse-battery tolerance, and dual-mode (boost/buck) flexibility - making it irreplaceable in legacy single-cell industrial and medical portable systems.
Availability
LT1073CN8#PBF is available at Aetrix Electronics and suitable for pagers, handheld instruments, and battery backup supplies requiring stable component supply with long-term industrial availability and through-hole compatibility.
Supply support for LT1073CN8#PBF 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 engineering for legacy Linear parts including the LT1073 family.
The LT1073 product line was designed specifically for ultra-low-power, wide-input-voltage DC/DC conversion in space- and battery-constrained portable electronics - emphasizing simplicity (3 external components), robustness (reverse-battery protection), and longevity (1V start-up).
FAQ
What is the minimum input voltage required for LT1073CN8#PBF to start switching?
The LT1073CN8#PBF guarantees operation down to 1.0V input in step-up mode, enabling direct use with deeply discharged NiCd or alkaline cells. Startup is confirmed at 1.15V (min) per datasheet; typical functional start occurs at 1.0V with appropriate output loading and capacitor selection. This 1V capability is intrinsic to the LT1073CN8#PBF's internal reference and oscillator design.
Can LT1073CN8#PBF be used in step-down (buck) configuration?
Yes, the LT1073CN8#PBF supports step-down operation by reconfiguring SW1 and SW2 connections: SW1 ties to VIN, SW2 drives the inductor. Output voltage remains set by the same FB divider equation (VOUT = 212mV × (1 + R2/R1)). However, datasheet limits step-down output to ≤6.2V and recommends LT1173 for inputs >3V - the LT1073CN8#PBF remains valid for low-VIN buck applications like 3.3V-to-2.5V conversion.
How does the ILIM pin function on LT1073CN8#PBF?
The ILIM pin (Pin 1) on LT1073CN8#PBF allows user adjustment of peak switch current by connecting a resistor between ILIM and VIN. A 220Ω resistor sets ~400mA limit; open connection yields 1.5A max. The internal circuit senses switch current and terminates the ON cycle when the ILIM voltage drops ~0.7V below VIN. This protects the LT1073CN8#PBF and external magnetics under varying input or load conditions.
Does LT1073CN8#PBF include reverse-battery protection?
Yes, LT1073CN8#PBF incorporates dedicated reverse-battery protection that limits reverse current to ≤750mA when –1.6V is applied to GND or SW2 pins (with VIN, ILIM, and SW1 grounded). This prevents damage during incorrect battery installation - a documented feature verified in Absolute Maximum Ratings and Electrical Characteristics tables of the official LT1073 datasheet.
What is the purpose of the AO and SET pins on LT1073CN8#PBF?
The AO (Pin 6) and SET (Pin 7) pins form a standalone auxiliary gain block on LT1073CN8#PBF: SET is the non-inverting input referenced to an internal 212mV voltage, and AO is an open-collector output sinking up to 100µA. This block can implement low-battery detection (via resistor divider on SET), linear post-regulation, or output ripple reduction (by buffering FB with gain) - all without external op-amps. Its functionality is fully specified and tested for LT1073CN8#PBF.
LT1073CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1073CN8#PBF FAQ
1.How can I place an order for LT1073CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1073CN8#PBF 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 LT1073CN8#PBF reliable?
The price and inventory of LT1073CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1073CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1073CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1073CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1073CN8#PBF?
LT1073CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1073CN8#PBF 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 LT1073CN8#PBF?
For technical support, including LT1073CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1073CN8#PBF requirements.
6.How does Aetrix verify that LT1073CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1073CN8#PBF 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 LT1073CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1073CN8#PBF?
All LT1073CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1073CN8#PBF, 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 LT1073CN8#PBF part is unused and in its original packaging.
Return procedure for LT1073CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1073CN8#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
