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Analog Devices Inc. LTC1704BEGN#TRPBF
- Part No.:
- LTC1704BEGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1704BEGN#TRPBF.pdf
- Description:
- IC REG DL BUCK/LNR 550KHZ 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,918
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Product details
Overview
LTC1704BEGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output power management IC integrating a 550kHz synchronous buck switching regulator controller and a linear regulator controller. It delivers 1.8V/15A from the switcher and 1.5V/2A from the linear stage, with ±1.5% DC accuracy on the switcher output and ±2% on the linear output. Designed for high-efficiency distributed power systems, it eliminates external current-sense resistors and supports programmable current limiting and start-up delay.
For engineers reviewing the LTC1704BEGN#TRPBF datasheet, LTC1704BEGN#TRPBF pinout, LTC1704BEGN#TRPBF application, or LTC1704BEGN#TRPBF equivalent, key selection criteria include continuous light-load operation (no Burst Mode), dual regulated outputs with independent enable control, PGOOD monitoring of both rails, and compatibility with N-channel MOSFETs and NPN pass transistors in compact 16-pin SSOP packaging.
Technical Context
The LTC1704BEGN#TRPBF implements voltage-mode PWM control with a 20MHz gain-bandwidth error amplifier and internal 0.8V reference, enabling precise regulation down to 0.8V without level-shifting circuitry. Its synchronous buck architecture drives external N-channel MOSFETs via floating TG and grounded BG drivers, with BOOST–SW voltage rating up to 6V and peak gate drive current of 5A.
Unlike the LTC1704 variant, the LTC1704BEGN#TRPBF disables Burst Mode entirely-ensuring continuous 550kHz switching under all load conditions to eliminate low-frequency output ripple. The linear regulator controller uses REGILM-servoed current programming (0.8V threshold) and foldback protection, while PGOOD asserts only when both outputs remain within ±10% of nominal for ≥1µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 550kHz typical; enables use of sub-1µH inductors and low-ESR ceramic capacitors to minimize board area. |
| Switcher Output Accuracy | ±1.5% over temperature; ensures stable core voltage for microprocessors and FPGAs without post-regulation trimming. |
| Linear Regulator Accuracy | ±2% over temperature; supports auxiliary I/O or memory rails where tighter tolerance is not required. |
| PGOOD Threshold | ±10% on both outputs; provides reliable system-level power sequencing and fault detection with single open-drain signal. |
| Max Duty Cycle | 90% typical; allows 1.8V output from 5V input (36% duty) with margin for line/load transients and dropout. |
| Shutdown Current | <150µA; enables low-power standby modes in battery-backed or energy-sensitive applications. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial and embedded computing environments without derating. |
Pinout & Package
Package: 16-lead narrow-body SSOP (0.150" width), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (1) | Top gate driver output | Floating high-side driver capable of sinking/sourcing 5A peak; requires BOOST-to-SW 1µF bypass for charge-pump operation. |
| SW (2) | Switching node connection | Return path for TG driver; also used for current-limit sensing during QB conduction and Burst comparator input (not active in LTC1704B). |
| IMAX (3) | Switcher current limit threshold | Internal 10µA pull-up sets overcurrent trip point via resistor to PGND; Kelvin connection required for accuracy. |
| RUN/SS (4) | Soft-start and shutdown control | 3µA internal current source sets ramp time (~300ms/µF); pulled low with REGILM to enter shutdown (<150µA IQ). |
| COMP (5) | Error amplifier output | Direct connection to PWM comparator; accepts Type II or Type III compensation networks for phase margin optimization. |
| FB (6) | Switcher feedback input | Virtual ground node referenced to 0.8V internal bandgap; supports inverting summing topology for flexible pole/zero placement. |
| REGDR (7) | Linear regulator driver output | Sources up to 30mA base current to external NPN pass transistor; dropout voltage ≤1.1V at 30mA. |
| GND (8) | Signal ground reference | Low-impedance return for analog circuits; must be star-connected to PGND near VIN bypass capacitor. |
| REGFB (9) | Linear regulator feedback input | 0.8V servo point; connected via resistor divider from VOUTREG to set output voltage (e.g., 1.5V = R1/R2 = 0.875). |
| REGILM (10) | Linear current limit & enable | Internally held at 0.8V; external resistor programs drive current limit; capacitor adds programmable start-up delay. |
| VCC (11) | Analog supply input | 3.15V–5.5V supply for internal logic and amplifiers; requires ≥10µF local bypass to GND. |
| PGOOD (12) | Power-good status flag | Open-drain output asserting low when either output deviates >±10%; needs external pull-up to VCC or system rail. |
| PGND (13) | Power ground return | High-current return for BG driver and MOSFET sources; must be low-inductance path to VIN and COUTSW grounds. |
| BG (14) | Bottom gate driver output | Ground-referenced driver for synchronous rectifier QB; 0.5Ω output impedance supports fast turn-on/off. |
| PVCC (15) | Bottom gate driver supply | Must exceed QB's VGS(ON); typically tied to VIN; requires ≥10µF bypass to PGND. |
| BOOST (16) | Top gate driver supply | Charge-pumped floating supply; bypassed 1µF to SW; Schottky diode from VIN enables full enhancement of QT. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | VDS-based current limiting using IMAX pin eliminates power loss and layout complexity in high-current paths. |
| Continuous 550kHz operation | Guaranteed absence of Burst Mode ensures predictable EMI spectrum and eliminates low-frequency ripple in noise-sensitive analog supplies. |
| Programmable linear regulator current limit | REGILM pin current (set by RREGILM) directly scales REGDR output drive, enabling precise foldback protection for external NPN. |
| Dual independent enable controls | RUN/SS and REGILM allow separate sequencing of switcher and linear outputs, supporting multi-rail power-up timing requirements. |
| Integrated PGOOD monitoring | Single open-drain output confirms regulation of both outputs simultaneously, simplifying system health-check logic. |
Applications
| Processor Core Supply | FPGA I/O Bank Supply |
|---|---|
Use Scenario: Providing tightly regulated 1.8V/15A core voltage to high-performance microprocessors or ASICs with rapid load transients. IC Role / Device Role / Timing Role: Primary switching regulator controller driving external N-channel MOSFETs in synchronous buck configuration. Use Value: ±1.5% DC accuracy and 20MHz error amplifier bandwidth ensure <±5% total regulation during 0→10A load steps, preventing logic errors or thermal throttling. | Use Scenario: Generating clean 1.5V/2A auxiliary supply for FPGA I/O banks requiring low-noise, ripple-free voltage despite variable digital activity. IC Role / Device Role / Timing Role: Linear regulator controller driving external NPN transistor with programmable current limit and foldback protection. Use Value: Continuous 550kHz switching on main rail avoids beat frequencies with I/O clock domains; linear stage delivers ripple-free output without filtering overhead. |
| Industrial PLC Power Module | Network Switch PHY Supply |
Use Scenario: Dual-rail power solution for programmable logic controllers operating in –40°C to +85°C ambient with long-term reliability requirements. IC Role / Device Role / Timing Role: Dual-output PMIC with independent enable pins and PGOOD flag for system-level power sequencing and watchdog integration. Use Value: Guaranteed –40°C to +85°C operation, <150µA shutdown current, and robust overvoltage/overcurrent protection meet industrial safety and uptime standards. | Use Scenario: Powering 10/100/1000BASE-T PHY transceivers requiring stable 1.8V analog and 1.5V digital rails with fast transient response. IC Role / Device Role / Timing Role: Synchronous buck controller for analog rail; linear controller for digital rail with independent soft-start timing. Use Value: RUN/SS and REGILM pins enable staggered start-up to avoid inrush current peaks; PGOOD confirms both rails before link training begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1704EGN#TRPBF | Includes Burst Mode operation below ~1A load; introduces ~100Hz–1kHz ripple during light loads. | Better light-load efficiency but unsuitable for noise-sensitive analog rails or EMI-constrained designs. | Select LTC1704EGN#TRPBF only if >2% efficiency gain at light load outweighs ripple and EMI concerns. |
| LT3510EFE#TRPBF | Single-output 550kHz buck controller with integrated 1.5A power switch; no linear regulator stage or dual-rail support. | Requires external LDO for second rail; lacks PGOOD monitoring of multiple outputs and independent enable controls. | Choose LT3510EFE#TRPBF only for cost-sensitive single-rail applications where auxiliary regulation is handled separately. |
Compared with LTC1704EGN#TRPBF, the LTC1704BEGN#TRPBF trades light-load efficiency for ripple-free output and deterministic EMI; versus LT3510EFE#TRPBF, it provides integrated dual-rail control and system-level power-good signaling at higher BOM and layout complexity.
Availability
LTC1704BEGN#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, FPGA power modules, network switch PHY supplies, and high-reliability embedded computing systems requiring stable component supply across extended temperature ranges.
Supply support for LTC1704BEGN#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 LTC1704BEGN#TRPBF belongs to Linear's high-performance dual-output controller family, designed specifically for space-constrained, multi-rail embedded systems needing precise regulation, robust protection, and simplified layout with external discrete power stages.
FAQ
What is the key functional difference between LTC1704BEGN#TRPBF and LTC1704EGN#TRPBF?
The LTC1704BEGN#TRPBF disables Burst Mode operation entirely, ensuring continuous 550kHz switching under all load conditions to eliminate low-frequency output ripple. In contrast, the LTC1704EGN#TRPBF automatically enters Burst Mode at light loads (<~1A), improving light-load efficiency but introducing ~100Hz–1kHz ripple that may interfere with sensitive analog circuits. Both share identical pinout, package, and core specifications.
Does LTC1704BEGN#TRPBF require an external current-sense resistor for overcurrent protection?
No. The LTC1704BEGN#TRPBF implements VDS-based current limiting using the IMAX pin and the voltage drop across the bottom MOSFET (QB) during its on-time. An external resistor from IMAX to PGND sets the current threshold-no sense resistor is needed in the high-current path, reducing power loss and PCB area.
How is the linear regulator output voltage set on LTC1704BEGN#TRPBF?
The linear regulator output voltage is set via a resistor divider from VOUTREG to GND, connected to the REGFB pin. The LTC1704BEGN#TRPBF internally regulates REGFB to 0.800V ±2%, so VOUTREG = 0.800V × (1 + R1/R2). For example, a 1.5V output requires R1/R2 = 0.875 (e.g., R1 = 8.75kΩ, R2 = 10kΩ).
Can LTC1704BEGN#TRPBF drive both N-channel MOSFETs and an NPN transistor simultaneously?
Yes. The LTC1704BEGN#TRPBF is explicitly designed to drive two external N-channel MOSFETs (QT and QB) for the synchronous buck stage via TG and BG pins, while simultaneously driving an external NPN pass transistor (e.g., D44H11) for the linear regulator stage via the REGDR pin. Both stages operate independently with separate feedback and enable controls.
What is the minimum recommended bypass capacitance for BOOST and PVCC on LTC1704BEGN#TRPBF?
The BOOST pin requires a minimum 1µF ceramic capacitor connected directly between BOOST and SW to support the floating charge-pump gate drive. The PVCC pin requires ≥10µF low-ESR capacitor connected directly to PGND to sustain BG driver current during high dV/dt switching events. Both capacitors must be placed adjacent to their respective pins with short, low-inductance traces.
LTC1704BEGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 550kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3.15V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1704BEGN#TRPBF FAQ
1.How can I place an order for LTC1704BEGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1704BEGN#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 LTC1704BEGN#TRPBF reliable?
The price and inventory of LTC1704BEGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1704BEGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1704BEGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1704BEGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1704BEGN#TRPBF?
LTC1704BEGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1704BEGN#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 LTC1704BEGN#TRPBF?
For technical support, including LTC1704BEGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1704BEGN#TRPBF requirements.
6.How does Aetrix verify that LTC1704BEGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1704BEGN#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 LTC1704BEGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1704BEGN#TRPBF?
All LTC1704BEGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1704BEGN#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 LTC1704BEGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1704BEGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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