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Analog Devices Inc. LTC1174IN8#PBF
- Part No.:
- LTC1174IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1174IN8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,714
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Product details
Overview
LTC1174IN8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down and inverting DC/DC converter IC with internal 0.9Ω P-channel MOSFET switch, pin-selectable 340mA/600mA current limit, 130µA standby current, and integrated low-battery detector - designed for 5V-to–5V, 9V-to-5V, or 5V-to-3.3V conversion in battery-powered portable instruments.
For engineers reviewing the LTC1174IN8#PBF datasheet, LTC1174IN8#PBF pinout, LTC1174IN8#PBF application, or LTC1174IN8#PBF equivalent, key selection criteria include input voltage range (4V–18.5V), output regulation accuracy (±2.5% for fixed 5V version), thermal performance (θJA = 110°C/W), shutdown quiescent current (1µA), and compatibility with standard Schottky catch diodes and surface-mount inductors.
Technical Context
The LTC1174IN8#PBF implements a constant off-time current-mode control architecture with internal timing capacitor trimming, enabling frequency variation based on VIN–VOUT while maintaining stable regulation. Its burst mode operation automatically engages under light load to reduce quiescent current from 600µA active to 130µA sleep mode.
It integrates a 1.25V reference, hysteresis-controlled low-battery comparator (trip at 1.25V ±0.15V), and dual-threshold shutdown logic (VIH = 1.2V, VIL = 0.75V). The IPGM pin selects peak inductor current (340mA or 600mA), and SW pin drives external inductor/diode with 4µs typical off-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 18.5V - supports single Li-ion, multi-cell NiCd/NiMH, or unregulated wall adapters without pre-regulation. |
| Output Voltage | Fixed 5.00V ±2.5% - internally trimmed resistive divider eliminates external feedback components for simplified 5V supply design. |
| Efficiency | Up to 94% at 300mA - enables extended battery life in portable equipment with minimal thermal dissipation. |
| Quiescent Current | 130µA in sleep mode - preserves battery charge during standby in memory backup or sensor monitoring applications. |
| Shutdown Current | 1µA max - ensures near-zero power draw when system is powered off or in deep sleep states. |
| Current Limit | Pin-selectable 340mA or 600mA - allows optimization of inductor size and efficiency across varying load profiles. |
| Switch RDS(ON) | 0.9Ω typical at 9V - reduces conduction loss and improves efficiency in medium-current step-down configurations. |
Pinout & Package
Package: 8-lead PDIP (Plastic Dual In-line Package), 0.3-inch width, through-hole mount. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage / feedback input | For LTC1174IN8#PBF (fixed 5V version), this pin connects to internal 5V divider; no external resistor required. |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 1.2mA when LBIN < 1.25V; used to drive LED or microcontroller interrupt for battery monitoring. |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts external resistive divider from VIN; trip point set by ratio relative to 1.25V internal reference. |
| GND (Pin 4) | Power and signal ground reference | Must be low-impedance connection; serves as return path for switch current, feedback, and comparator circuits. |
| SW (Pin 5) | Drain of internal P-channel MOSFET switch | Connects directly to cathode of external Schottky diode and inductor; high dv/dt node requiring tight layout. |
| VIN (Pin 6) | Main input supply voltage | Decoupled with ≥100µF electrolytic + 0.1µF ceramic; absolute max 18.5V for HV variant (LTC1174HV). |
| IPGM (Pin 7) | Current limit programming input | Pull to VIN for 600mA limit, pull to GND for 340mA limit; high-impedance input requiring solid logic level. |
| SHUTDOWN (Pin 8) | Active-low micropower enable | Pull to GND to disable switching and reduce IQ to 1µA; must not float - tie to VIN or controlled logic line. |
Key Features
| Feature | Design Value |
|---|---|
| Four-component solution | Requires only inductor, Schottky diode, input capacitor, and output capacitor - minimizes BOM count and PCB area. |
| Low-battery detection | Integrated comparator with 1.25V reference and 7.5–30mV hysteresis - enables reliable end-of-life warning without external ICs. |
| Burst Mode operation | Automatically transitions to discontinuous conduction at light loads - maintains >85% efficiency down to 1mA output current. |
| Short-circuit protection | Internal current limiting with extended off-time during fault - prevents thermal runaway and enables self-recovery after overload removal. |
| Wide temperature range | Rated for –40°C to +85°C operation (I-grade) - suitable for industrial and automotive-adjacent portable equipment. |
Applications
| Portable Instruments | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeters, data loggers, and portable oscilloscopes operating from 4–12.5V battery packs. IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering stable rail for microcontroller, ADC, and display drivers. Use Value: 94% peak efficiency extends runtime; 130µA sleep current preserves battery during measurement intervals. | Use Scenario: Wireless sensors and IoT edge nodes powered by AA/AAA alkaline or Li-ion cells. IC Role / Device Role / Timing Role: System power manager providing regulated 5V and low-battery alert signaling via LBOUT. Use Value: Pin-selectable current limit matches inductor choice to load profile; 1µA shutdown enables years of shelf life. |
| Memory Backup Supply | Step-Down Converters |
Use Scenario: SRAM or real-time clock (RTC) backup circuits requiring ultra-low-quiescent 5V supply. IC Role / Device Role / Timing Role: Always-on regulator maintaining volatile memory during main system power-off. Use Value: 130µA sleep current and 1µA shutdown minimize battery drain - critical for 10+ year backup life. | Use Scenario: Industrial controllers converting 9V or 12V intermediate rails to 5V for logic and interface ICs. IC Role / Device Role / Timing Role: High-efficiency non-isolated buck converter replacing linear regulators to reduce heat and improve PSRR. Use Value: Internal 0.9Ω switch eliminates external MOSFET; wide VIN range accommodates aging battery or unregulated inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1174CN8#PBF | Commercial grade (0°C to 70°C), θJA = 150°C/W - higher thermal resistance than LTC1174IN8#PBF. | Intended for consumer-grade portable devices where ambient temperature remains below 70°C. | Select LTC1174CN8#PBF only if operating temperature stays within 0°C–70°C and thermal margin permits higher junction rise. |
| LTC1174HVIN8#PBF | Extended input range (4V–18.5V vs. 4V–13.5V), higher RDS(ON) (0.9–1.55Ω), same pinout and function. | Required for systems with input transients above 13.5V or long-life battery stacks exceeding 12V nominal. | Choose LTC1174HVIN8#PBF when VIN may exceed 13.5V; otherwise LTC1174IN8#PBF offers lower conduction loss. |
Compared with LTC1174CN8#PBF, LTC1174IN8#PBF provides wider temperature range and better thermal performance, while LTC1174HVIN8#PBF adds input voltage headroom at the cost of slightly higher switch resistance - all share identical pinout, feature set, and application circuitry.
Availability
LTC1174IN8#PBF is available at Aetrix Electronics and suitable for portable instruments, battery-powered equipment, and memory backup supply applications requiring stable component supply, extended temperature operation, and long-term industrial availability.
Supply support for LTC1174IN8#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 LTC1174 family.
The LTC1174 product line was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space-constrained, battery-sensitive applications - emphasizing simplicity, reliability, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LTC1174IN8#PBF?
The LTC1174IN8#PBF has an absolute maximum input voltage of 13.5V on the VIN pin. Exceeding this rating risks permanent damage. For applications requiring higher input voltage, the LTC1174HVIN8#PBF variant supports up to 18.5V and shares identical pinout and functionality with the LTC1174IN8#PBF.
Does the LTC1174IN8#PBF require external feedback resistors to regulate 5V output?
No, the LTC1174IN8#PBF is the fixed 5V output version of the LTC1174 family. It contains an internal precision resistive divider that sets VOUT to 5.00V ±2.5%, eliminating the need for external feedback resistors. Only the adjustable LTC1174 (without suffix) requires external R1/R2.
How does the low-battery detection function work on the LTC1174IN8#PBF?
The LTC1174IN8#PBF uses an internal 1.25V reference and comparator. When the voltage at LBIN (Pin 3), derived from an external resistive divider across VIN, falls below 1.25V, LBOUT (Pin 2) pulls low to indicate low battery. Hysteresis (7.5–30mV) prevents chatter during voltage sag.
What is the purpose of the IPGM pin on the LTC1174IN8#PBF?
The IPGM pin (Pin 7) selects the peak inductor current limit: connecting it to GND sets 340mA, while connecting it to VIN sets 600mA. This allows designers to optimize inductor size, ripple current, and efficiency for specific load requirements without changing the IC.
Can the LTC1174IN8#PBF be used in inverting (positive-to-negative) configurations?
Yes, the LTC1174IN8#PBF supports inverting operation - for example, generating –5V from a +5V input. In this configuration, the output is taken from the GND pin, and the circuit requires careful attention to absolute maximum ratings, especially the SW-to-VIN voltage differential, which must not exceed –0.3V.
LTC1174IN8#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, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 18.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 340mA, 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1174IN8#PBF FAQ
1.How can I place an order for LTC1174IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174IN8#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 LTC1174IN8#PBF reliable?
The price and inventory of LTC1174IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174IN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174IN8#PBF?
LTC1174IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174IN8#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 LTC1174IN8#PBF?
For technical support, including LTC1174IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174IN8#PBF requirements.
6.How does Aetrix verify that LTC1174IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174IN8#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 LTC1174IN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174IN8#PBF?
All LTC1174IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174IN8#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 LTC1174IN8#PBF part is unused and in its original packaging.
Return procedure for LTC1174IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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