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Analog Devices Inc. LTC1574CS-5#PBF
- Part No.:
- LTC1574CS-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1574CS-5#PBF.pdf
- Description:
- IC REG BUCK 5V 340MA/600MA 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,051
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Product details
Overview
LTC1574CS-5#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 5V, high-efficiency step-down DC/DC converter with integrated P-channel MOSFET switch (0.9Ω RDS(ON)), internal Schottky diode (0.45V VF at 200mA), and pin-selectable current limit (340mA or 600mA). It operates from 4V to 18.5V input and delivers up to 400mA output in compact SO-16 package, targeting battery-powered portable instruments and distributed power systems.
For engineers reviewing the LTC1574CS-5#PBF datasheet, LTC1574CS-5#PBF pinout, LTC1574CS-5#PBF application, or LTC1574CS-5#PBF equivalent, key selection criteria include its micropower shutdown (2µA), low-battery detection (1.25V trip), constant off-time architecture enabling noise-sensitive designs, and three-component external solution for 5V regulation.
Technical Context
The LTC1574CS-5#PBF uses a current-mode, constant off-time control architecture with 4µs fixed tOFF, resulting in variable switching frequency dependent on VIN and VOUT (e.g., ~111kHz at VIN=9V, VOUT=5V). Its internal 0.9Ω P-MOSFET switch and 0.45V Schottky diode enable high efficiency (up to 94%) without external gate drive or diode.
It integrates a precision 1.25V reference, low-battery comparator with hysteresis (7.5–30mV), and active-low micropower shutdown (ISHDN = 2µA). The IPGM pin selects between 340mA (IPGM = 0V) and 600mA (IPGM = VIN) peak inductor current limits, directly optimizing efficiency across load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (4.75V–5.25V), internally trimmed for stable regulation without external feedback resistors. |
| Input Voltage Range | 4V to 18.5V absolute max; supports 4×NiCd (4.8V min) and 12V industrial rails with robust dropout operation. |
| Max Output Current | 400mA continuous (at 175mA–400mA load, IPGM = VIN), limited by internal 600mA current sense threshold and thermal design. |
| Efficiency | Up to 94% at 300mA, VIN=9V; enables >100-hour runtime in AA/AAA battery systems with minimal heat rise. |
| Quiescent Current | 130µA in active sleep mode; reduces no-load power loss in always-on instrumentation and memory backup supplies. |
| Shutdown Current | 2µA typical; preserves battery life during extended standby in portable medical or data-logging devices. |
| Low-Battery Detection | 1.25V comparator threshold (±0.15V) with 7.5–30mV hysteresis; allows precise VIN monitoring via external resistor divider. |
Pinout & Package
Package: 16-lead plastic SO (narrow, 0.150-inch width), JEDEC MS-012AC, θJA = 110°C/W, RoHS-compliant #PBF finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | No Connection | Internally unconnected; must remain floating or tied to GND per layout best practice to avoid noise coupling. |
| 2, 4, 13, 15 | Ground (GND) | Four dedicated ground pins minimize PCB trace inductance and improve thermal dissipation for high-current return paths. |
| 3, 14 | Switch Node (SW) | Drain of internal P-MOSFET and cathode of integrated Schottky diode; requires tight layout with low-inductance path to inductor and output capacitor. |
| 5 | Input Supply (VIN) | Primary power input (4V–18.5V); must be decoupled within 1cm of Pin 4 (GND) using ≥10µF ceramic + bulk electrolytic. |
| 6 | Current Limit Select (IPGM) | Logic-level input: 0V → 340mA limit, VIN → 600mA limit; sets peak inductor current without external components. |
| 7 | Shutdown (SHDN) | Active-low enable: <0.75V = shutdown (2µA IQ), >1.2V = active; compatible with microcontroller GPIO or battery monitor outputs. |
| 10 | Feedback (VFB) | Internal 1.25V reference node; on LTC1574CS-5#PBF, connected to fixed-resistor divider setting 5.00V output (no external adjustment). |
| 11 | Low-Battery Output (LBOUT) | Open-drain N-channel output sinking up to 1.5mA; asserts low when LBIN < 1.25V, driving LEDs or MCU interrupt lines. |
| 12 | Low-Battery Input (LBIN) | Inverting input of comparator; accepts scaled VIN via external resistor divider to trigger LBOUT at user-defined voltage (e.g., 5.5V). |
| 10 (VFB) | Output Voltage Sense | Monitors regulated 5V output via internal resistive divider; provides stability and line/load regulation without external compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | 0.45V forward drop at 200mA eliminates external diode BOM cost and layout area while reducing conduction loss by ~30% vs discrete solutions. |
| P-Channel MOSFET Switch | 0.9Ω RDS(ON) at VIN < 11V minimizes switching losses and enables high efficiency down to 4V input, critical for multi-cell battery systems. |
| Pin-Selectable Current Limit | Dual thresholds (340mA/600mA) allow one footprint to support both low-power sensors and higher-current peripherals without redesign. |
| Micropower Shutdown | 2µA shutdown current extends shelf life and operational time in battery-backed SRAM, real-time clocks, and IoT edge nodes. |
| Low-Battery Detector | 1.25V precision comparator with programmable hysteresis enables reliable end-of-life battery signaling without external comparators or references. |
Applications
| Battery-Powered Portable Instruments | Memory Backup Power Supply |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and field calibration tools powered by 4×AA alkaline or NiMH cells (4.8V–6.0V). IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering stable rail to ADCs, microcontrollers, and display drivers under varying battery discharge profiles. Use Value: 94% peak efficiency and 130µA sleep current extend battery life beyond 200 hours; low-battery detection alerts users before measurement drift occurs. | Use Scenario: SRAM and real-time clock (RTC) backup in industrial PLCs and telecom base stations during main power failure. IC Role / Device Role / Timing Role: Standby 5V supply maintaining volatile memory and timekeeping functions from supercapacitor or coin cell during AC outage. Use Value: 2µA shutdown current prevents rapid backup source depletion; wide 4V–18.5V input accommodates diverse backup sources (3.6V LiSOCl₂ to 12V supercaps). |
| Distributed Power Systems | Noise-Sensitive Audio/Measurement Circuits |
Use Scenario: Point-of-load (POL) conversion in modular test equipment where 12V backplane powers multiple 5V subsystems. IC Role / Device Role / Timing Role: Local DC/DC converter replacing linear regulators to reduce heat and improve system efficiency in dense PCB layouts. Use Value: Three-component design (inductor + 2 caps) saves board space; constant off-time architecture avoids sub-harmonic oscillation in parallel configurations. | Use Scenario: Low-noise 5V supply for audio DACs, precision op-amps, and RF front-ends in portable spectrum analyzers. IC Role / Device Role / Timing Role: Regulated 5V rail with feed-forward capacitor (6.8nF) shifting switching noise above 20kHz to avoid audible artifacts. Use Value: 30mVPP output ripple across full load range; internal Schottky and optimized layout suppress EMI without ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1174CS-5#PBF | SO-8 package, 0.5A peak current, Burst Mode™ operation; lower quiescent current (100µA active) but no integrated Schottky diode. | Preferred for ultra-low-power sensor nodes where size and IQ dominate; requires external diode and larger inductor for same efficiency. | Select when board space is constrained and 0.5A output suffices; accept added BOM complexity for 30µA lower sleep current. |
| LTC1707ES8#PBF | Synchronous rectification (no external diode needed), 600mA output, selectable Burst Mode, 2.85V–8.5V input range; higher efficiency at light loads but narrower VIN. | Better suited for single-cell Li-ion (3.0V–4.2V) or USB-powered devices; lacks low-battery detector and fixed 5V option requires external resistors. | Choose for modern battery chemistries and highest light-load efficiency; omit if low-battery signaling or wide 4V–18.5V input is mandatory. |
Compared with LTC1574CS-5#PBF, LTC1174CS-5#PBF trades integrated diode and higher current for smaller footprint and lower IQ, while LTC1707ES8#PBF replaces the Schottky with synchronous FETs for better light-load efficiency but sacrifices input voltage range and integrated battery monitoring.
Availability
LTC1574CS-5#PBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, memory backup power supplies, and distributed power systems requiring stable component supply with long lifecycle support.
Supply support for LTC1574CS-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 acquired Linear Technology in 2017 and maintains its legacy high-performance analog and power management portfolio with rigorous reliability testing and military-grade screening options.
The LTC1574 family was designed specifically for high-efficiency, low-component-count DC/DC conversion in space-constrained, battery-sensitive applications-emphasizing micropower operation, integrated protection, and ease of use over programmability.
FAQ
What is the maximum continuous output current of the LTC1574CS-5#PBF?
The LTC1574CS-5#PBF delivers up to 400mA continuous output current when configured with IPGM = VIN (600mA current limit) and proper thermal management. At 175mA–400mA loads, output voltage remains within ±2.5% regulation (4.75V–5.25V), as specified in the Electrical Characteristics table under Load Regulation conditions.
Does the LTC1574CS-5#PBF require external feedback resistors to set the 5V output?
No, the LTC1574CS-5#PBF features an internally trimmed resistive divider connecting VFB (Pin 10) to GND, fixing the output at 5.00V ±2.5%. Unlike the adjustable LTC1574, it needs no external R1/R2 network-only input/output capacitors and an inductor to operate, reducing BOM count and layout sensitivity.
How does the low-battery detection function work on the LTC1574CS-5#PBF?
The LTC1574CS-5#PBF uses Pin 12 (LBIN) as the inverting input to a comparator referenced to an internal 1.25V bandgap. An external resistor divider scales VIN to LBIN; when this voltage drops below 1.25V, Pin 11 (LBOUT) pulls low (sinking up to 1.5mA). Hysteresis (7.5–30mV) prevents chatter during battery sag.
Can the LTC1574CS-5#PBF be used in inverting (positive-to-negative) configurations?
Yes, the LTC1574CS-5#PBF supports inverting operation per Figure 4 in the datasheet: connect VOUT to system ground and take –5V from the GND pins. Input voltage headroom is reduced (max VIN = VOUT + 12V), limiting max input to 7V for –5V output. The internal Schottky and switch remain fully functional in this topology.
What is the operating frequency range of the LTC1574CS-5#PBF?
The LTC1574CS-5#PBF uses constant off-time control with tOFF ≈ 4µs, so its switching frequency varies with input and output voltage: f ≈ 1 / [tOFF × (1 – VOUT/VIN) + VD/VIN]. At VIN = 9V and VOUT = 5V, typical frequency is ~111kHz; at VIN = 6V, it rises to ~200kHz, enabling smaller magnetics.
LTC1574CS-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- 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:
- Up to 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1574CS-5#PBF FAQ
1.How can I place an order for LTC1574CS-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1574CS-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 LTC1574CS-5#PBF reliable?
The price and inventory of LTC1574CS-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 LTC1574CS-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1574CS-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1574CS-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1574CS-5#PBF?
LTC1574CS-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1574CS-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 LTC1574CS-5#PBF?
For technical support, including LTC1574CS-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1574CS-5#PBF requirements.
6.How does Aetrix verify that LTC1574CS-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1574CS-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 LTC1574CS-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1574CS-5#PBF?
All LTC1574CS-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1574CS-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 LTC1574CS-5#PBF part is unused and in its original packaging.
Return procedure for LTC1574CS-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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