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Analog Devices Inc. LTC1574CS-5#TRPBF
- Part No.:
- LTC1574CS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1574CS-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 340MA/600MA 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
LTC1574CS-5#TRPBF 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 for battery-powered instrumentation.
For engineers reviewing the LTC1574CS-5#TRPBF datasheet, LTC1574CS-5#TRPBF pinout, LTC1574CS-5#TRPBF application, or LTC1574CS-5#TRPBF equivalent, key selection criteria include its micropower shutdown (2µA), low-battery detection interface (LBIN/LBOUT), constant off-time architecture enabling 111kHz operation at VIN=9V/VOUT=5V, and support for inverting configurations without external diode.
Technical Context
The LTC1574CS-5#TRPBF uses a constant off-time current-mode control architecture where switching frequency varies inversely with input voltage (e.g., ~111kHz at VIN=9V, VOUT=5V) and depends on VD across the internal Schottky diode. Its peak inductor current is set by IPGM pin voltage (0V → 340mA; VIN → 600mA), independent of inductance value.
It integrates a 1.25V reference for feedback (VFB pin), low-battery comparator with 1.25V threshold and 7.5–30mV hysteresis, and open-drain LBOUT capable of sinking 1.5mA. The internal 0.9Ω P-MOSFET and Schottky diode enable >94% efficiency at 175mA load with 100µH inductor and 22µF/35V output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (4.75V–5.25V), internally trimmed via resistive divider |
| Input Voltage Range | 4V to 18.5V absolute max; supports 4×NiCd (4.8V min) and 12V systems |
| Max Output Current | 400mA continuous (IPGM = VIN); 175mA typical at full regulation per datasheet curves |
| Efficiency | Up to 94% at 175mA, VIN=6V, VOUT=5V, L=100µH (CTX100-4) |
| Quiescent Current | 130µA active mode; 2µA shutdown (SHDN = GND) |
| Low-Battery Threshold | 1.25V on LBIN pin; trip point set externally via resistor divider (e.g., 5.5V input = 162k/4.7k) |
| Switch RDS(ON) | 0.9Ω typical at VIN < 11V; enables high efficiency without external FET |
Pinout & Package
Package: 16-lead plastic SO (narrow, 0.150-inch width), JEDEC MS-012AC, θJA = 110°C/W, operating junction temperature up to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | No Connection | Not bonded; must remain unconnected to avoid parasitic coupling |
| 2, 4, 13, 15 | Ground | Four dedicated GND pins minimize ground impedance and improve thermal dissipation |
| 3, 14 | Switch Node (SW) | Drain of internal P-MOSFET and cathode of internal Schottky diode; connects to inductor and output capacitor |
| 5 | Input Supply (VIN) | Main power input; requires local 0.1µF ceramic decoupling to GND (Pin 4) |
| 6 | Current Limit Select (IPGM) | Logic-level input: 0V → 340mA limit; VIN → 600mA limit; sets peak inductor current |
| 7 | Shutdown Control (SHDN) | Active-low micropower enable; <0.75V = shutdown (2µA IQ); >1.2V = active |
| 10 | Feedback (VFB) | Internal 1.25V reference node; used only in adjustable versions; tied to VOUT in -5 variant |
| 11 | Low-Battery Output (LBOUT) | Open-drain N-channel sink; pulls low when LBIN < 1.25V; drives LED or microcontroller interrupt |
| 12 | Low-Battery Input (LBIN) | Inverting input of comparator; connected to external resistor divider from VIN to set trip voltage |
| 10 (LTC1574CS-5) | Output Voltage (VOUT) | Regulated 5V output; internally connected to VFB via precision divider; no external feedback required |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switch & Diode | 0.9Ω P-MOSFET + 0.45V Schottky diode eliminates 2 external components and reduces board area |
| Pin-Selectable Current Limit | Two discrete current thresholds (340mA/600mA) selected by IPGM logic level-no resistor needed |
| Micropower Shutdown | 2µA shutdown current extends battery life in portable instruments and remote sensors |
| Low-Battery Detection Interface | Dedicated LBIN/LBOUT pins with 1.25V reference and hysteresis simplify state-of-charge monitoring |
| Constant Off-Time Architecture | Enables stable operation across wide VIN range without compensation network or external timing components |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld blood glucose meters requiring regulated 5V rail from two alkaline cells (3V nominal). IC Role / Device Role / Timing Role: Primary step-down regulator delivering 5V/150mA with <130µA quiescent current to maximize shelf life. Use Value: Internal Schottky diode and low RDS(ON) sustain >90% efficiency down to 3.5V input, extending usable battery range by 22% vs discrete solutions. | Use Scenario: Remote environmental sensor node powered by Li-ion (3.0–4.2V) with sleep/wake cycles. IC Role / Device Role / Timing Role: Main 5V supply with active-low SHDN controlled by MCU; LBOUT triggers wake-up on low-battery alert. Use Value: 2µA shutdown current and programmable LBIN threshold (e.g., 3.3V) prevent deep discharge while enabling autonomous field maintenance. |
| Industrial Distributed Power | Inverting Power Supplies |
Use Scenario: DIN-rail mounted PLC I/O module deriving 5V from 12V backplane with EMI constraints. IC Role / Device Role / Timing Role: Local point-of-load converter with minimal external parts (3 components total) and low EMI due to constant off-time control. Use Value: 111kHz switching frequency allows use of small 50µH surface-mount inductors (CTX50-4), reducing footprint by 40% vs 500kHz alternatives. | Use Scenario: Audio DAC requiring clean –5V bias from existing +5V rail in compact audio interface. IC Role / Device Role / Timing Role: Inverting converter using LTC1574CS-5#TRPBF with GND as output reference; SW node becomes –5V source. Use Value: No external diode needed-internal Schottky handles reverse conduction, cutting BOM count and improving reliability in space-constrained designs. |
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 |
|---|---|---|---|
| LTC1174CS-5#PBF | SO-8 package; 500kHz fixed frequency; 0.5A output; no LBIN/LBOUT; higher IQ (150µA active) | Lacks low-battery detection; better suited for space-constrained, higher-frequency designs without battery monitoring | Select when PCB area is critical and battery telemetry is handled externally |
| LT1376CS8-5#TRPBF | SO-8; 500kHz; 1.5A output; external diode required; no integrated LB comparator | Higher current capability but needs 3 extra passives; no built-in battery sensing | Choose for >500mA loads where efficiency at light load is secondary to peak output |
Compared with LTC1574CS-5#TRPBF, LTC1174CS-5#PBF saves board space but removes battery monitoring, while LT1376CS8-5#TRPBF trades integration for higher current and fixed frequency-neither offers the same combination of micropower shutdown, integrated diode, and LBIN/LBOUT in SO-16.
Availability
LTC1574CS-5#TRPBF is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial distributed power systems, and inverting power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LTC1574CS-5#TRPBF 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 technical and manufacturing continuity for legacy Linear power products.
The LTC1574 family was designed for high-efficiency, low-component-count DC/DC conversion in battery-critical applications-emphasizing micropower operation, integrated protection, and ease of use in portable and industrial systems.
FAQ
What is the maximum continuous output current of the LTC1574CS-5#TRPBF?
The LTC1574CS-5#TRPBF supports up to 400mA continuous output current when IPGM is tied to VIN (600mA current limit), as confirmed in the Electrical Characteristics table under "IPEAK" and validated by load regulation curves showing stable 5V output up to 400mA at VIN=9V. Derating applies above 70°C ambient.
Does the LTC1574CS-5#TRPBF require an external feedback resistor network?
No. The LTC1574CS-5#TRPBF is a fixed-output variant with internal resistive divider connecting VFB (Pin 10) to VOUT, eliminating external feedback components. This is explicitly stated in the "ELECTRICAL CHARACTERISTICS" table where VOUT is specified for LTC1574CS-5, and in the "FUNCTIONS" section confirming VFB is internally tied to the output divider.
How does the low-battery detection function work on the LTC1574CS-5#TRPBF?
The LTC1574CS-5#TRPBF uses LBIN (Pin 12) as the inverting input of a comparator referenced to an internal 1.25V bandgap. When the external resistor divider on LBIN drops below 1.25V, LBOUT (Pin 11) sinks up to 1.5mA. Hysteresis (7.5–30mV) prevents chatter, and trip point is set solely by the divider ratio-e.g., 162kΩ/4.7kΩ yields ~5.5V trip at VIN.
Can the LTC1574CS-5#TRPBF be used in inverting configurations?
Yes. The LTC1574CS-5#TRPBF supports inverting operation per Figure 4 in the datasheet: GND pins become the negative output (–5V), SW becomes the return path, and VIN supplies the positive rail. The internal Schottky diode handles reverse conduction, requiring no external diode-making it ideal for compact dual-rail audio or sensor biasing.
What is the recommended input capacitor for the LTC1574CS-5#TRPBF?
The datasheet specifies a minimum 0.1µF ceramic capacitor directly between VIN (Pin 5) and GND (Pin 4), plus bulk capacitance (e.g., 100µF tantalum) elsewhere on the board. RMS current rating for bulk CIN should be ≥174mA (calculated per design example), and low-ESR construction is mandatory to handle high-frequency ripple from the 0.9Ω switch.
LTC1574CS-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1574CS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1574CS-5#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1574CS-5#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1574CS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1574CS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1574CS-5#TRPBF?
LTC1574CS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1574CS-5#TRPBF 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#TRPBF?
For technical support, including LTC1574CS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1574CS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1574CS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1574CS-5#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1574CS-5#TRPBF?
All LTC1574CS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1574CS-5#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1574CS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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