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Analog Devices Inc. LTC1174HVCN8-3.3#PBF
- Part No.:
- LTC1174HVCN8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1174HVCN8-3.3#PBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
LTC1174HVCN8-3.3#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down DC/DC converter with fixed 3.3V output, internal 0.9Ω P-channel MOSFET switch, 4V–18.5V input range, and pin-selectable 340mA/600mA current limit. It delivers up to 94% efficiency in portable battery-powered equipment requiring stable low-noise 3.3V rails.
For engineers reviewing the LTC1174HVCN8-3.3#PBF datasheet, LTC1174HVCN8-3.3#PBF pinout, LTC1174HVCN8-3.3#PBF application, or LTC1174HVCN8-3.3#PBF equivalent, key selection criteria include its HV input rating, low 130µA standby current, integrated low-battery detector, Burst Mode® operation for light-load efficiency, and compatibility with standard surface-mount inductors and Schottky diodes.
Technical Context
The LTC1174HVCN8-3.3#PBF uses a constant off-time (COT) architecture with wafer-sort-trimmed 4µs off-time, enabling frequency scaling with input-output voltage differential. Its internal 1.25V reference and fixed resistive divider set VOUT = 3.30V ±3.5% over temperature and line/load.
It integrates a low-battery comparator (trip at 1.25V on LBIN), open-drain LBOUT indicator, micropower shutdown (2µA max), and selectable peak current limit via IPGM pin-0V yields 340mA, VIN yields 600mA-enabling optimization across load profiles without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30V ±3.5% (guaranteed over full temp & load; enables direct replacement of 3.3V LDOs with higher efficiency) |
| Input Voltage Range | 4V to 18.5V (supports wide battery chemistries: 4×NiCd, 3–4×Li-ion, or 12V industrial rails) |
| Peak Efficiency | 94% at 300mA, VIN=9V, VOUT=3.3V (reduces thermal stress vs linear regulators in space-constrained designs) |
| Quiescent Current | 130µA in sleep mode (extends battery life in always-on monitoring systems) |
| Current Limit | Pin-selectable: 340mA (IPGM = 0V) or 600mA (IPGM = VIN); prevents inductor saturation under transient loads |
| Switch RDS(on) | 0.90Ω typical at VIN=9V (limits conduction loss; supports >175mA continuous output with minimal derating) |
| Low-Battery Trip | 1.25V threshold on LBIN with 7.5–30mV hysteresis (enables reliable end-of-discharge detection without external comparators) |
Pinout & Package
Package: 8-lead PDIP (N8), through-hole mount, 110°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 3.3V output; internally connected to precision resistive divider; no external resistor required |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 1.5mA when LBIN < 1.25V; requires external pull-up for LED or microcontroller flag |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts resistor-divider from VIN; trip point set by ratio to internal 1.25V reference |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; must be low-impedance star point |
| SW (Pin 5) | Drain of internal P-channel MOSFET | Connects directly to cathode of external Schottky catch diode; high dv/dt node requiring tight layout |
| VIN (Pin 6) | Main input supply (4V–18.5V) | Must be decoupled with ≥10µF electrolytic + 0.1µF ceramic close to pin; powers internal circuitry and switch |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: 0V → 340mA limit; VIN → 600mA limit; high-impedance, must not float |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull ≤0.75V to disable (2µA shutdown current); pull ≥1.2V to enable; high-impedance, requires pull-up if unused |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 85%+ efficiency down to 1mA load by disabling switching and entering micropower sleep, reducing IQ to 130µA |
| Internal 0.9Ω P-MOSFET | Eliminates need for external high-side switch; reduces BOM count and PCB area vs controller-based solutions |
| Only four external components | Requires only inductor, Schottky diode, input capacitor, and output capacitor-no compensation network needed |
| Short-circuit protection | Combines current limiting (340/600mA) with extended off-time to prevent thermal runaway during output faults |
| Low-dropout operation | Operates with VIN – VOUT as low as 0.5V (e.g., 3.8V→3.3V), maximizing usable battery voltage range |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Wearable ECG patch powered by single 3.7V Li-ion cell, operating continuously for 72 hours. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator; regulates battery voltage down to 3.3V while maintaining efficiency above 90% across 3.7V–3.2V discharge curve. Use Value: 130µA sleep current extends runtime; low-battery detector triggers firmware shutdown before cell damage occurs. | Use Scenario: Battery-backed environmental sensor node deployed in remote locations, sampling temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Step-down regulator supplying 3.3V to MCU and RF transceiver; enters Burst Mode® between samples to minimize average current draw. Use Value: 94% peak efficiency and 2µA shutdown current enable >5-year battery life on two AA cells. |
| Handheld Test Equipment | Memory Backup Supplies |
Use Scenario: Portable oscilloscope with LCD display and analog front-end, powered by rechargeable 7.4V Li-Po pack. IC Role / Device Role / Timing Role: Generates clean 3.3V rail for digital logic and ADC reference; handles 4V–18.5V input swing during charging/discharging cycles. Use Value: Fixed 3.3V output eliminates need for external feedback resistors; HV rating avoids intermediate 5V stage. | Use Scenario: SRAM backup in industrial PLC retaining configuration during main power loss. IC Role / Device Role / Timing Role: Inverting converter generating –3.3V from 3.3V system rail to bias SRAM retention circuitry. Use Value: Pin-compatible with LTC1174HV-3.3 variant; enables negative rail generation with same footprint and minimal added components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1174CN8-3.3#PBF | Standard input range (4V–13.5V); lower max VIN than HV version | Not suitable for 15V+ input rails or wide-chemistry battery packs | Select when input never exceeds 13.5V; lower cost, identical pinout and features otherwise |
| LT1931ES5#TRMPBF | Fixed 3.3V, 1.2MHz constant-frequency PWM; 2.7V–20V input; 1.3A switch | Higher switching frequency enables smaller magnetics but increases EMI sensitivity | Choose for compact designs needing <1mm height inductors; requires external compensation and more components |
Compared with LTC1174CN8-3.3#PBF, the LTC1174HVCN8-3.3#PBF adds 5V headroom for 18.5V absolute max input, critical for automotive or industrial 12V systems with load-dump transients. Versus LT1931ES5#TRMPBF, it trades higher frequency for simpler design, lower EMI, and inherent light-load efficiency via Burst Mode®-ideal for battery longevity over raw size reduction.
Availability
LTC1174HVCN8-3.3#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and memory backup supplies requiring stable component supply, long-term manufacturability, and lead-free compliance.
Supply support for LTC1174HVCN8-3.3#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 its legacy of high-performance analog and power management ICs for demanding applications.
The LTC1174 family was designed specifically for simple, efficient, low-component-count DC/DC conversion in battery-powered and distributed power systems where reliability, efficiency across load range, and ease of use are prioritized over ultra-high frequency or programmability.
FAQ
What is the maximum input voltage rating for the LTC1174HVCN8-3.3#PBF?
The LTC1174HVCN8-3.3#PBF has an absolute maximum input voltage of 18.5V on the VIN pin, confirmed in the Absolute Maximum Ratings table. This HV rating distinguishes it from the standard LTC1174CN8-3.3#PBF (13.5V max), making the LTC1174HVCN8-3.3#PBF suitable for 12V systems with transient overvoltage conditions.
Does the LTC1174HVCN8-3.3#PBF require external feedback resistors to set the 3.3V output?
No. The LTC1174HVCN8-3.3#PBF integrates a precision resistive divider that fixes the output at 3.30V ±3.5%. Unlike the adjustable LTC1174 variant, it does not use the VFB pin for external feedback-Pin 1 is labeled VOUT and functions solely as the regulated output terminal.
How does the LTC1174HVCN8-3.3#PBF achieve high efficiency at light loads?
The LTC1174HVCN8-3.3#PBF employs Burst Mode® operation: when load current drops below ~10mA, it disables switching, enters a 130µA sleep state, and relies on output capacitance to maintain regulation. The hysteretic comparator wakes the device only when output droop exceeds hysteresis-delivering >85% efficiency down to 1mA.
What is the purpose of the IPGM pin on the LTC1174HVCN8-3.3#PBF?
The IPGM pin (Pin 7) selects the peak inductor current limit: tying it to GND sets 340mA; tying it to VIN sets 600mA. This allows designers to optimize inductor size and efficiency for specific load profiles without changing the IC-critical for balancing thermal performance and transient response in battery-powered systems using the LTC1174HVCN8-3.3#PBF.
Can the LTC1174HVCN8-3.3#PBF be used in inverting (negative output) configurations?
Yes-the LTC1174HVCN8-3.3#PBF can be configured as an inverting converter to generate –3.3V. Application Note 1174 TA07 shows this topology using the HV variant. The internal switch and control architecture support both buck and inverting modes; however, the fixed 3.3V version's feedback network is optimized for positive output, so external resistor adjustment is required for precise negative regulation.
LTC1174HVCN8-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 18.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 340mA, 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1174HVCN8-3.3#PBF FAQ
1.How can I place an order for LTC1174HVCN8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVCN8-3.3#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 LTC1174HVCN8-3.3#PBF reliable?
The price and inventory of LTC1174HVCN8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174HVCN8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVCN8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVCN8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVCN8-3.3#PBF?
LTC1174HVCN8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVCN8-3.3#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 LTC1174HVCN8-3.3#PBF?
For technical support, including LTC1174HVCN8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVCN8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1174HVCN8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVCN8-3.3#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 LTC1174HVCN8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVCN8-3.3#PBF?
All LTC1174HVCN8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVCN8-3.3#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 LTC1174HVCN8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1174HVCN8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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