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Analog Devices Inc. LTC1704EGN#TRPBF
- Part No.:
- LTC1704EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1704EGN#TRPBF.pdf
- Description:
- IC REG DL BUCK/LNR 550KHZ 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
LTC1704EGN#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 drives external N-channel MOSFETs for the switcher (up to 15A output) and an external NPN transistor for the linear stage (up to 2A), delivering ±1.5% DC accuracy on the switcher output and ±2% on the linear output. It is used in high-efficiency, space-constrained logic supply generation for FPGA, ASIC, and microprocessor core voltage regulation.
For engineers reviewing the LTC1704EGN#TRPBF datasheet, LTC1704EGN#TRPBF pinout, LTC1704EGN#TRPBF application, or LTC1704EGN#TRPBF equivalent, key selection criteria include its Burst Mode™ operation at light loads, integrated PGOOD monitoring of both outputs, absence of external current-sense resistors, and compatibility with low-ESR ceramic output capacitors in compact 16-pin SSOP layouts.
Technical Context
The LTC1704EGN#TRPBF implements a voltage-mode PWM control architecture with a 20MHz gain-bandwidth error amplifier, enabling Type-3 compensation for robust phase margin across wide load transients. Its feedback reference is fixed at 0.800V, supporting output voltages as low as 0.8V without level-shifting circuitry.
It features independent enable/control paths: RUN/SS governs soft-start timing for the switching regulator, while REGILM sets both linear regulator current limit and enables/disables the linear stage. The PGOOD open-drain flag asserts only when both VOUTSW and VOUTREG remain within ±10% of their nominal values simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 550kHz typical - enables use of sub-1µH inductors and low-value ceramic output capacitors, reducing board area and cost. |
| Switcher Output Accuracy | ±1.5% DC - ensures tight core voltage regulation for sensitive digital loads like FPGAs without post-regulation trimming. |
| Linear Regulator Accuracy | ±2% DC - supports stable auxiliary rail generation (e.g., I/O or memory voltage) with programmable current limit via REGILM pin. |
| Burst Mode Operation | Enabled (LTC1704 variant) - automatically transitions to discontinuous conduction at light loads to maintain >80% efficiency down to ~10mA. |
| PGOOD Monitoring | Monitors both outputs - open-drain flag pulls low if either VOUTSW or VOUTREG deviates beyond ±10%, simplifying system power sequencing validation. |
| Package | 16-pin narrow SSOP (GN) - 5.0mm × 6.2mm footprint with exposed thermal pad; compatible with standard reflow profiles and automated assembly. |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded systems requiring reliable operation across extended ambient ranges. |
Pinout & Package
Package: 16-lead plastic narrow SSOP (GN), 0.15mm lead thickness, 0.635mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (1) | Top gate driver output | Drives gate of high-side N-MOSFET (QT); floating supply referenced to SW; supports ≤10,000pF gate capacitance. |
| SW (2) | Switching node connection | Connects to source of QT and drain of QB; serves as return path for TG driver and current limit sensing point. |
| IMAX (3) | Switcher current limit threshold | Internal 10µA pull-up sets overcurrent trip via resistor to PGND; Kelvin connection required for accuracy. |
| RUN/SS (4) | Soft-start and shutdown control | 3µA internal current source charges external capacitor; pulling low disables switcher and enters shutdown with <150µA quiescent current. |
| COMP (5) | Error amplifier output | Direct connection to PWM comparator input; accepts RC network from FB for full Type-3 loop compensation. |
| FB (6) | Switcher feedback input | Virtual ground node for 0.800V reference; connects to resistor divider from VOUTSW; enables precise low-voltage regulation. |
| REGDR (7) | Linear regulator driver output | Sources up to 30mA base current to external NPN pass transistor; regulates REGFB to 0.800V. |
| GND (8) | Signal ground reference | Return for all low-power analog circuits (FB, COMP, RUN/SS); must be separated from PGND except at single-point star connection. |
| REGFB (9) | Linear regulator feedback input | Input to linear error amplifier; connected to resistor divider from VOUTREG; regulated to 0.800V. |
| REGILM (10) | Linear current limit and enable | Internally servoed to 0.8V; external resistor programs drive current limit; capacitor adds programmable start-up delay. |
| VCC (11) | Analog supply input | Powers internal bias, error amp, and logic; requires ≥10µF bypass to GND; max 5.5V. |
| PGOOD (12) | Power-good status flag | Open-drain output; pulled low if either output is outside ±10%; requires external pull-up resistor. |
| PGND (13) | Power ground return | Return path for BG driver and high-current paths; connect near VIN and VOUTSW bypass caps and QB source. |
| BG (14) | Bottom gate driver output | Drives gate of low-side N-MOSFET (QB); 0.5Ω output impedance; supports ≤10,000pF gate capacitance. |
| PVCC (15) | Bottom gate driver supply | Must exceed VGS(ON) of QB; typically tied to VIN; requires ≥10µF bypass to PGND. |
| BOOST (16) | Top gate driver floating supply | Connected to SW via 1µF capacitor; external Schottky diode from VIN creates charge pump; enables full enhancement of QT. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | VDS-based current limiting eliminates power loss and component count in high-current paths, improving efficiency and thermal performance. |
| Integrated PGOOD monitoring | Single open-drain flag confirms regulation integrity of both switcher and linear outputs, reducing need for external supervisors or sequencers. |
| Programmable linear regulator current limit | REGILM pin accepts resistor to set maximum base drive - enables precise foldback protection for external NPN under short-circuit conditions. |
| Independent soft-start and enable controls | RUN/SS and REGILM allow staggered turn-on of switcher and linear rails, preventing inrush current conflicts during power-up sequencing. |
| 20MHz error amplifier GBW | Supports complex compensation networks (Type-3) for high phase margin and fast transient response, even with low-ESR ceramic output capacitors. |
Applications
| FPGA Core Voltage Supply | ASIC I/O Rail Generation |
|---|---|
Use Scenario: Powering Xilinx or Intel FPGA core logic operating at 1.0V–1.2V with dynamic current draw up to 12A. IC Role / Device Role / Timing Role: LTC1704EGN#TRPBF acts as primary buck controller for main core rail and secondary linear controller for auxiliary bias voltage. Use Value: Burst Mode™ maintains >85% efficiency at 100mA idle load while 550kHz switching minimizes inductor size to ≤0.68µH, enabling <1.5in² total solution area. | Use Scenario: Generating 1.8V or 2.5V I/O supply for multi-core ASICs with tight regulation requirements and moderate transient demands. IC Role / Device Role / Timing Role: LTC1704EGN#TRPBF delivers tightly regulated switcher output for I/O domain and uses linear stage for low-noise auxiliary bias (e.g., PLL supply). Use Value: ±1.5% switcher accuracy and ±2% linear accuracy ensure compliance with JEDEC VDDIO specs; PGOOD flag validates both rails before releasing reset. |
| Industrial Microcontroller Power | Distributed Point-of-Load System |
Use Scenario: Providing 3.3V main supply and 1.5V sensor interface rail in programmable logic controllers (PLCs) operating from 5V bus. IC Role / Device Role / Timing Role: LTC1704EGN#TRPBF operates switcher from 5V input to generate 3.3V main rail and linear stage to derive clean 1.5V for analog front-end. Use Value: –40°C to 85°C rating ensures reliability in uncontrolled enclosures; REGILM-programmed current limit prevents NPN overheating during field wiring faults. | Use Scenario: Replacing centralized DC/DC modules with localized regulation near high-current processors in telecom line cards. IC Role / Device Role / Timing Role: LTC1704EGN#TRPBF integrates switcher and linear control in one IC to reduce component count and improve layout density per PoL node. Use Value: 16-pin SSOP package allows placement directly adjacent to processor BGA; no external sense resistor reduces thermal coupling risk in dense layouts. |
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 |
|---|---|---|---|
| LTC1704BEGN#TRPBF | Same pinout and architecture but disables Burst Mode™; operates continuously at light loads, eliminating low-frequency output ripple. | Preferred where low-noise linear-like behavior is critical (e.g., RF bias rails), accepting reduced light-load efficiency. | Select LTC1704BEGN#TRPBF only when output ripple spectrum must avoid sub-100kHz content; otherwise LTC1704EGN#TRPBF offers superior efficiency below 10% load. |
| TPS51220ARUKT | TI dual-output controller with integrated MOSFET drivers but no linear regulator stage; supports only buck-buck configuration. | Requires external LDO for auxiliary rail; lacks REGDR/REGFB interface for NPN-based linear control. | Choose TPS51220ARUKT when both rails are high-current buck outputs and discrete LDOs are acceptable; LTC1704EGN#TRPBF remains optimal when low-noise, programmable-current linear output is required. |
Compared with LTC1704BEGN#TRPBF, the LTC1704EGN#TRPBF trades light-load ripple for higher efficiency, while versus TPS51220ARUKT it provides unique NPN-driven linear regulation-enabling cost-effective, thermally robust auxiliary rails without adding discrete regulators or sense resistors.
Availability
LTC1704EGN#TRPBF is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC I/O regulation, and industrial microcontroller supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1704EGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1704EGN#TRPBF belongs to Linear's legacy high-efficiency dual-output controller product line, designed specifically for compact, high-density logic supply generation in FPGA, ASIC, and microprocessor systems where board space and thermal constraints are critical.
FAQ
What is the primary function of the LTC1704EGN#TRPBF in a power system?
The LTC1704EGN#TRPBF functions as a dual-output power controller: its switching regulator section drives external N-channel MOSFETs to generate a high-current, high-efficiency buck output (e.g., 1.8V/15A), while its linear regulator controller drives an external NPN transistor to provide a lower-noise, programmable auxiliary output (e.g., 1.5V/2A). This integration reduces component count and PCB area in logic supply designs.
Does the LTC1704EGN#TRPBF require an external current-sense resistor?
No, the LTC1704EGN#TRPBF does not require an external current-sense resistor. It implements MOSFET RDS(on)-based current limiting by comparing the voltage drop across the bottom MOSFET (QB) to the IMAX pin threshold. This eliminates power loss and board space associated with shunt resistors while maintaining accurate overcurrent protection.
How does Burst Mode™ operation benefit the LTC1704EGN#TRPBF in low-power states?
Burst Mode™ operation in the LTC1704EGN#TRPBF significantly improves light-load efficiency by disabling switching cycles until output voltage droop triggers a burst of pulses. At 10mA load, this extends battery life or reduces standby power in portable and always-on systems - achieving >80% efficiency where continuous 550kHz operation would drop below 50%.
Can the LTC1704EGN#TRPBF regulate output voltages below 0.8V?
No, the LTC1704EGN#TRPBF cannot directly regulate output voltages below 0.8V because its internal feedback reference is fixed at 0.800V. The minimum achievable output is 0.8V (when FB is tied directly to VOUTSW). Lower voltages require external level-shifting circuitry or a different controller with adjustable reference.
What thermal considerations apply to the LTC1704EGN#TRPBF package?
Although the LTC1704EGN#TRPBF uses a 16-pin narrow SSOP (GN) package without an exposed thermal pad, its θJA is specified at 130°C/W. For reliable operation above 1A average load, PCB layout must include generous copper pour connected to PGND and GND pins, and thermal vias under the package body are strongly recommended to manage junction temperature within the 125°C TJMAX limit.
LTC1704EGN#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
LTC1704EGN#TRPBF FAQ
1.How can I place an order for LTC1704EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1704EGN#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 LTC1704EGN#TRPBF reliable?
The price and inventory of LTC1704EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1704EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1704EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1704EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1704EGN#TRPBF?
LTC1704EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1704EGN#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 LTC1704EGN#TRPBF?
For technical support, including LTC1704EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1704EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1704EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1704EGN#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 LTC1704EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1704EGN#TRPBF?
All LTC1704EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1704EGN#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 LTC1704EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1704EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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