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Analog Devices Inc. LTC1437AIG#TRPBF
- Part No.:
- LTC1437AIG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1437AIG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
LTC1437AIG#TRPBF from Analog Devices (formerly Linear Technology) is a phase-lockable, fixed-frequency synchronous step-down switching regulator controller driving external N-channel MOSFETs. It operates from 3.5V to 36V input, delivers up to 5A output with pin-selectable voltages (1.19V–9V), and integrates a 0.5A auxiliary linear regulator for low-noise CPU I/O or audio supplies. Used in notebook computers and battery-powered instrumentation.
For engineers reviewing the LTC1437AIG#TRPBF datasheet, LTC1437AIG#TRPBF pinout, LTC1437AIG#TRPBF application, or LTC1437AIG#TRPBF equivalent, key selection criteria include its PLL-synchronizable 112–240kHz oscillator, ≤300ns minimum on-time, dual N-MOSFET synchronous drive, remote sense capability, and –40°C to 85°C industrial temperature rating.
Technical Context
The LTC1437AIG#TRPBF implements a current-mode, constant-frequency step-down architecture with Adaptive Power™ output stage that dynamically selects between large (TGL/BG) and small (TGS) top-side MOSFET drivers to maintain high efficiency down to ~1% load. Its error amplifier controls peak inductor current via the ITH pin, while SFB enables secondary-winding regulation independent of main output loading.
It features a programmable soft-start via RUN/SS, built-in power-on reset timer (65536 cycles ≈300ms), foldback current limiting option, and logic-controlled micropower shutdown (IQ < 25µA). The auxiliary regulator uses an external PNP pass device and supports 12V output via internal resistive divider when AUXDR > 9.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-range DC power distribution and automotive battery inputs. |
| Output Voltage Range | 1.19V to 9V - selectable via VPROG pin or external resistor divider at VOSENSE. |
| Oscillator Frequency | 112–240kHz - PLL-locked range enables noise-sensitive system synchronization. |
| Min On-Time | ≤300ns - enables high-frequency, low-duty-cycle operation for high VIN/VOUT ratios. |
| Current Sense Threshold | 130–180mV - sets peak inductor current limit with ±15mV temp drift over –40°C to 85°C. |
| Shutdown Current | <25µA - ensures ultra-low quiescent draw during battery backup or sleep modes. |
| Aux Reg Output | 0.5A linear regulator - provides low-noise, low-dropout supply for sensitive analog circuits. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G Package), 150-mil width, θJA = 110°C/W, RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies control circuitry and bootstrap capacitor charging; requires local 22µF decoupling. |
| INTVCC | Internal 5V regulator output | Powers gate drivers and internal logic; must be decoupled with ≥2.2µF tantalum to PGND. |
| TGL / TGS / BG | Top- and bottom-gate drivers | TGL drives large N-MOSFET; TGS drives small N-MOSFET for Adaptive Power mode; BG drives synchronous rectifier. |
| VOSENSE / VPROG | Feedback and voltage select | VOSENSE accepts remote-sensed output; VPROG open = adjustable, 0V = 3.3V, INTVCC = 5V. |
| SFB | Secondary feedback input | Forces continuous operation when grounded; enables independent regulation of auxiliary winding outputs. |
| RUN/SS | Enable + soft-start control | Pull below 1.3V to shut down; capacitor to ground sets ramp time (~0.5s/µF). |
| PLLIN / PLL LPF | Phase-locked loop interface | PLLIN accepts external sync clock; PLL LPF sets oscillator frequency (0–2.4V = –30% to +30% fOSC). |
| AUXON / AUXDR / AUXFB | Auxiliary regulator control | AUXON enables 0.5A PNP-based linear regulator; AUXDR is open-drain base drive; AUXFB senses 12V or custom output. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ Output Stage | Automatically switches between TGL/BG (high-current) and TGS-only (low-current) drive to sustain constant-frequency operation down to ~1% load without efficiency collapse. |
| PLL-Synchronizable Oscillator | Locks to external clock via PLLIN; frequency tunable ±30% via PLL LPF voltage for EMI reduction and system-level timing coordination. |
| Integrated Auxiliary Linear Regulator | Drives external PNP to deliver 0.5A at 12V (internal divider) or user-defined voltage (external divider), eliminating need for separate LDO in multi-rail systems. |
| Remote Output Voltage Sensing | VOSENSE pin accepts feedback from point-of-load, compensating for PCB trace IR drop to maintain ±0.8% load regulation across full current range. |
| Programmable Soft Start & POR | RUN/SS capacitor sets controlled ramp; POR asserts open-drain signal after 65536 oscillator cycles once output reaches –5% of target, ensuring reliable system boot. |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Power management in ultraportable notebooks and PDAs requiring dual-rail supplies (core logic + I/O). IC Role / Device Role / Timing Role: Primary buck controller for main 3.3V/5V system rail; auxiliary regulator powers low-noise ADC reference or audio codec. Use Value: Adaptive Power mode maintains >85% efficiency from 10mA to 5A, extending battery life without burst-mode noise interference. | Use Scenario: Precision handheld test equipment operating from single Li-ion cell or 9V battery. IC Role / Device Role / Timing Role: Main step-down controller delivering stable 3.3V for microcontroller and sensors; SFB enables isolated auxiliary 12V for op-amp bias rails. Use Value: Remote sensing and <0.8% load regulation ensure measurement accuracy across varying battery discharge curves. |
| Wireless Modem Power | Industrial DC Distribution |
Use Scenario: Compact LTE/Wi-Fi modules needing clean, efficient 1.8V/3.3V rails with fast transient response. IC Role / Device Role / Timing Role: High-frequency (240kHz) buck controller minimizing inductor size; PLL lock synchronizes switching to baseband clock to suppress conducted EMI. Use Value: ≤300ns min on-time supports 12V input → 1.8V output conversion at 240kHz, reducing solution footprint by 30% vs legacy controllers. | Use Scenario: DIN-rail mounted PLC I/O modules powered from 24VDC industrial bus. IC Role / Device Role / Timing Role: Robust main converter handling 36V transients; low-battery detector (LBI/LBO) monitors input health for graceful shutdown. Use Value: Wide 3.5–36V input range and –40°C to 85°C rating ensure uninterrupted operation in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1436AIGN#TRPBF | 24-lead SSOP package; no AUXFB/AUXON pins; lacks auxiliary regulator functionality. | Suitable only for single-output buck designs without auxiliary 12V or comparator functions. | Select when auxiliary rail is unnecessary and board space is constrained (24-pin vs 28-pin). |
| MP2451DT-LF-Z | Integrated power MOSFETs (no external FETs); fixed 3.3V/5V options only; no PLL or SFB pin. | Targeted at cost-sensitive, low-power (<2A) applications where layout simplicity outweighs flexibility. | Choose for rapid prototyping or low-BOM-count designs where external FET control and multi-rail support are not required. |
Compared with LTC1436AIGN#TRPBF, the LTC1437AIG#TRPBF adds auxiliary regulation and secondary feedback for multi-output systems; versus MP2451DT-LF-Z, it offers higher current capability, external FET control, and system-level synchronization-critical for noise-sensitive or high-reliability industrial designs.
Availability
LTC1437AIG#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, wireless modems, and industrial DC distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1437AIG#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision, industrial, automotive, and communications applications.
The LTC1437A belongs to Linear's high-efficiency synchronous buck controller family, designed specifically for compact, multi-rail power systems in portable and battery-critical applications where efficiency, noise control, and thermal robustness are essential.
FAQ
What is the maximum input voltage rating for the LTC1437AIG#TRPBF?
The LTC1437AIG#TRPBF has an absolute maximum input voltage rating of 36V on the VIN pin. Continuous operation is specified from 3.5V to 30V, with transient tolerance up to 36V. Exceeding 36V risks permanent damage to internal circuitry, including the INTVCC regulator and gate drivers. Always use appropriate input filtering and clamping for automotive or industrial 24V bus applications where load-dump transients may occur.
Does the LTC1437AIG#TRPBF support remote voltage sensing, and how is it implemented?
Yes, the LTC1437AIG#TRPBF supports true remote voltage sensing via the VOSENSE pin. To implement it, connect VOSENSE directly to the load-side of the output capacitor (point-of-load), while feeding the feedback divider from the regulator output. This configuration compensates for IR drop across PCB traces and connectors, maintaining ±0.8% load regulation across the full 0–5A range. The VPROG pin determines whether VOSENSE connects to an internal or external divider.
How does the Adaptive Power™ mode in the LTC1437AIG#TRPBF improve light-load efficiency?
The Adaptive Power™ mode in the LTC1437AIG#TRPBF improves light-load efficiency by automatically switching from large (TGL/BG) to small (TGS-only) top-side MOSFET drive when load current drops below ~1% of full scale. This avoids the high gate-charge losses of large FETs at low duty cycles, sustaining constant-frequency operation down to ~50mA while maintaining >85% efficiency-extending battery runtime in portable devices without introducing burst-mode switching noise.
Can the LTC1437AIG#TRPBF synchronize its switching frequency to an external clock source?
Yes, the LTC1437AIG#TRPBF can synchronize its switching frequency using its integrated phase-locked loop (PLL). Connect an external clock signal to the PLLIN pin; the internal phase detector compares it to the oscillator and adjusts the PLL LPF voltage to lock the frequency. When locked, the top MOSFET turn-on aligns to the rising edge of the external clock, enabling deterministic EMI reduction and system-level timing coordination-critical in dense, multi-converter PCB layouts.
What is the role of the SFB pin in the LTC1437AIG#TRPBF, and how should it be configured?
The SFB (Secondary Feedback) pin in the LTC1437AIG#TRPBF enables independent regulation of a transformer secondary winding regardless of main output loading. Tie SFB to ground to force continuous conduction mode; connect to INTVCC if no secondary is used; or route through a resistive divider from the secondary winding to regulate auxiliary outputs. This ensures stable 12V auxiliary rail performance even when the main output is lightly loaded or unpowered.
LTC1437AIG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 30V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power on Reset, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1437AIG#TRPBF FAQ
1.How can I place an order for LTC1437AIG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1437AIG#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 LTC1437AIG#TRPBF reliable?
The price and inventory of LTC1437AIG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1437AIG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1437AIG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1437AIG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1437AIG#TRPBF?
LTC1437AIG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1437AIG#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 LTC1437AIG#TRPBF?
For technical support, including LTC1437AIG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1437AIG#TRPBF requirements.
6.How does Aetrix verify that LTC1437AIG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1437AIG#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 LTC1437AIG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1437AIG#TRPBF?
All LTC1437AIG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1437AIG#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 LTC1437AIG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1437AIG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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