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Analog Devices Inc. LTC1174HVCS8-5#PBF
- Part No.:
- LTC1174HVCS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174HVCS8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
LTC1174HVCS8-5#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down DC/DC converter with integrated 0.9Ω P-channel MOSFET switch, optimized for 5V output from 4V–18.5V input. It delivers up to 175mA continuous output current, achieves 94% peak efficiency at 9VIN/5VOUT, and features pin-selectable 340mA/600mA current limiting, low-battery detection, and micropower shutdown (1µA). It is widely used in battery-powered portable instruments requiring stable 5V rail generation.
For engineers reviewing the LTC1174HVCS8-5#PBF datasheet, LTC1174HVCS8-5#PBF pinout, LTC1174HVCS8-5#PBF application, or LTC1174HVCS8-5#PBF equivalent, key selection criteria include its wide 4V–18.5V input range, internal switch RDS(ON) of 0.9Ω (typ), 130µA standby current, programmable current limit via IPGM pin, and compatibility with standard surface-mount inductors (e.g., Coiltronics CTX50-4).
Technical Context
The LTC1174HVCS8-5#PBF employs a constant off-time (COT) architecture with wafer-trimmed 4µs tOFF, enabling frequency variation with input-output voltage differential (f ≈ 1/tOFF × (VIN−VOUT)/VIN). Its control loop combines hysteretic voltage regulation (Burst Mode®) for light loads and peak-current mode for continuous operation.
It integrates a 1.25V reference, feedback comparator (A1), current-sense amplifier (A2), and sleep-mode logic that reduces quiescent current from 130µA to 1µA in shutdown. The low-battery detector uses an external resistor divider on LBIN (Pin 3) referenced to 1.25V, with 7.5–30mV hysteresis and 1.25–1.4V trip threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (guaranteed over full temperature range) |
| Input Voltage Range | 4V to 18.5V - supports 4×NiCd, 12V industrial rails, and wide-input battery systems |
| Peak Efficiency | 94% at VIN=9V, IOUT=175mA, L=100µH - enables minimal thermal rise in compact layouts |
| Switch RDS(ON) | 0.90Ω (typ) at VIN=9V - reduces conduction loss vs. discrete FET solutions |
| Quiescent Current | 130µA (active), 1µA (shutdown) - extends battery life in always-on monitoring applications |
| Current Limit | 340mA (IPGM = 0V) or 600mA (IPGM = VIN) - selectable per load transient requirements |
| Operating Frequency | ~42kHz to ~111kHz (VIN-dependent) - avoids AM radio band; enables small passive sizing |
Pinout & Package
Package: 8-lead plastic SO (S8), RoHS-compliant, 150°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 5V output; internally connected to resistive divider - no external feedback required |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 1.2mA when LBIN < 1.25V; requires external pull-up for LED/alert signaling |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts voltage divider from VIN; sets trip point (e.g., 5.5V with 162k/4.7k) |
| GND (Pin 4) | Power and signal ground reference | Must be low-impedance return path for switch, catch diode, and input capacitor |
| SW (Pin 5) | Drain of internal P-channel MOSFET | Connects directly to cathode of Schottky catch diode; high dV/dt node - minimize trace length |
| VIN (Pin 6) | Main input supply (4V–18.5V) | Requires local 0.1µF ceramic + bulk electrolytic decoupling; feeds internal switch and bias |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: 0V → 340mA limit; VIN → 600mA limit - no floating allowed |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull ≤0.75V to disable; draws ≤0.5µA; must be actively driven - not left floating |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.9Ω P-MOSFET switch | Eliminates external high-side switch; reduces BOM count and layout complexity |
| Pin-selectable current limit (340mA/600mA) | Enables single design to support multiple load profiles without component change |
| Burst Mode® operation | Maintains >85% efficiency down to 1mA load - critical for intermittent-sensing devices |
| Low-battery detection with hysteresis | Configurable trip point (1.25–1.4V at LBIN) and 7.5–30mV hysteresis prevent chatter near threshold |
| Only four external components required | Inductor, catch diode, input cap, output cap - simplifies qualification and reduces failure points |
| 130µA standby / 1µA shutdown current | Extends shelf life and runtime in battery-backed memory, RTC, and sensor nodes |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end with analog signal chain and BLE transmission. IC Role / Device Role / Timing Role: Primary 5V supply for op-amps, ADC, and microcontroller; provides regulated rail during battery discharge from 12V to 4.5V. Use Value: 94% efficiency preserves battery capacity; Burst Mode® maintains 89% efficiency at 100µA sleep current, extending operational life by >30% vs. linear regulators. |
Use Scenario: Remote environmental monitor using 12V lead-acid backup with 5V MCU and SD card interface. IC Role / Device Role / Timing Role: Main 5V power source; LBIN/LBOUT pins drive low-battery warning before system brownout. Use Value: 4V–18.5V input range accommodates wide battery swing; 1.25V comparator reference ensures accurate 11.5V low-battery alert with minimal external parts. |
| Handheld Test Equipment | Memory Backup Systems |
Use Scenario: Portable multimeter with LCD display, precision references, and USB charging. IC Role / Device Role / Timing Role: Generates clean 5V rail from Li-ion (3.0–4.2V) via boost+LDO or directly from 9V alkaline pack. Use Value: Fixed 5V output eliminates feedback resistor errors; 130µA quiescent current enables >1-year shelf life with coin-cell backup. |
Use Scenario: SRAM retention circuit in telecom base station control board during AC failure. IC Role / Device Role / Timing Role: Provides 5V hold-up supply from supercapacitor or backup battery; operates down to 4V input. Use Value: Low dropout behavior (P-MOSFET fully on in dropout) maximizes usable energy from decaying backup source; short-circuit protection prevents fault propagation. |
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 |
|---|---|---|---|
| LT1931IS5#TRMPBF | Fixed 5V output, 1.25MHz switching, 1.2A switch, but requires external diode and higher IQ (1.1mA active) | Better suited for space-constrained designs needing >200mA; less efficient below 50mA due to fixed frequency | Select LT1931IS5#TRMPBF only if higher output current or smaller inductor size is mandatory; verify thermal performance at 18.5VIN |
| TPS62231DRVR | 3MHz synchronous buck, 300mA, 20µA IQ, but max VIN = 6.5V - incompatible with 18.5V requirement | Optimized for single-cell Li-ion (2.5–6.5V); cannot replace LTC1174HVCS8-5#PBF in wide-input applications | TPS62231DRVR is not a functional substitute for LTC1174HVCS8-5#PBF where input exceeds 6.5V; use only in low-voltage battery systems |
Compared with LT1931IS5#TRMPBF and TPS62231DRVR, the LTC1174HVCS8-5#PBF uniquely balances ultra-wide 4V–18.5V input capability, sub-200mA output, and micropower operation - making it irreplaceable in legacy 9V/12V battery-powered instrumentation where input voltage headroom and standby current are primary constraints.
Availability
LTC1174HVCS8-5#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and memory backup systems requiring stable component supply across extended product lifecycles.
Supply support for LTC1174HVCS8-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1174HVCS8-5#PBF belongs to Linear's legacy high-voltage DC/DC converter family, designed specifically for cost-sensitive, low-to-moderate current battery-powered applications demanding wide input range, high efficiency, and minimal external components.
FAQ
What is the maximum input voltage rating for the LTC1174HVCS8-5#PBF?
The LTC1174HVCS8-5#PBF has an absolute maximum input voltage of 18.5V on the VIN pin (Pin 6), as specified in the Absolute Maximum Ratings table. This distinguishes it from the standard LTC1174CS8-5#PBF (13.5V max), enabling reliable operation from 12V industrial rails and multi-cell battery packs without external clamping.
Does the LTC1174HVCS8-5#PBF require external feedback resistors to regulate 5V output?
No. The LTC1174HVCS8-5#PBF is a fixed-output variant: its internal resistive divider sets VOUT to 5.00V ±2.5%, eliminating the need for external feedback resistors. Pin 1 (VOUT) is the regulated output node - not a feedback input - unlike the adjustable LTC1174HVCS8 version which uses Pin 1 as VFB.
How does the IPGM pin affect current limiting on the LTC1174HVCS8-5#PBF?
The IPGM pin (Pin 7) selects between two factory-trimmed current limits: connecting IPGM to GND sets the peak switch current limit to 340mA (typ), while connecting it to VIN raises the limit to 600mA (typ). This allows one PCB layout to support varying load requirements without changing the IC or inductor.
Can the LTC1174HVCS8-5#PBF be used in inverting (positive-to-negative) configurations?
Yes - though the LTC1174HVCS8-5#PBF is optimized for step-down, its architecture supports inverting topologies. Application Note 1174 TA06 shows a –5V converter using LTC1174HV-5 (same die), requiring repositioning of input/output caps and catch diode. Output current derates to ~100mA due to duty-cycle and diode losses.
What is the purpose of the LBIN and LBOUT pins on the LTC1174HVCS8-5#PBF?
LBIN (Pin 3) is the inverting input of an internal 1.25V-referenced comparator; applying a resistor divider from VIN to LBIN sets the low-battery trip point (e.g., 5.5V with 162k/4.7k). LBOUT (Pin 2) is an open-drain N-channel output that sinks current when LBIN falls below the trip threshold - used to drive LEDs or interrupt lines.
LTC1174HVCS8-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 340mA, 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1174HVCS8-5#PBF FAQ
1.How can I place an order for LTC1174HVCS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVCS8-5#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 LTC1174HVCS8-5#PBF reliable?
The price and inventory of LTC1174HVCS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174HVCS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVCS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVCS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVCS8-5#PBF?
LTC1174HVCS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVCS8-5#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 LTC1174HVCS8-5#PBF?
For technical support, including LTC1174HVCS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVCS8-5#PBF requirements.
6.How does Aetrix verify that LTC1174HVCS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVCS8-5#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 LTC1174HVCS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVCS8-5#PBF?
All LTC1174HVCS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVCS8-5#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 LTC1174HVCS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1174HVCS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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