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Analog Devices Inc. LTC1704EGN#PBF
- Part No.:
- LTC1704EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1704EGN#PBF.pdf
- Description:
- IC REG DL BUCK/LNR 550KHZ 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
LTC1704EGN#PBF 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, multi-rail logic supply generation for embedded computing and telecom infrastructure.
For engineers reviewing the LTC1704EGN#PBF datasheet, LTC1704EGN#PBF pinout, LTC1704EGN#PBF application, or LTC1704EGN#PBF equivalent, key selection considerations include its Burst Mode™ operation at light loads, 16-pin narrow SSOP package, dual PGOOD monitoring, programmable current limit for both regulators, and absence of external current sense resistors.
Technical Context
The LTC1704EGN#PBF 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 uses floating TG and grounded BG drivers capable of 5A peak current, supporting external FDS6670A MOSFETs in a 1.8V/15A main rail configuration.
Burst Mode™ operation-enabled only in the LTC1704 (not LTC1704B)-reduces light-load quiescent current to <150µA while maintaining ±10% PGOOD window across both outputs. The linear regulator controller features programmable start-up delay via CDELAY on REGILM and foldback current limiting to protect the external D44H11 NPN pass transistor under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 550kHz typical; enables compact 0.68µH inductor and low-ESR ceramic output capacitors. |
| Switcher Output Accuracy | ±1.5% DC; ensures stable core voltage for 1.8V FPGA or ASIC supplies without post-regulation trimming. |
| Linear Regulator Accuracy | ±2% DC; supports auxiliary 1.5V/2A I/O rail with programmable current limit via RREGILM. |
| PGOOD Threshold | ±10% window on both outputs; open-drain flag asserts low if either VOUTSW or VOUTREG deviates beyond tolerance. |
| Shutdown Current | <150µA; allows full system power-down with minimal battery drain in portable applications. |
| Operating Temp Range | –40°C to 85°C; qualified for industrial-grade embedded systems and base station power modules. |
| Package | 16-pin narrow SSOP; 5.3mm × 6.2mm footprint compatible with automated SMT assembly. |
Pinout & Package
Package: 16-lead plastic narrow SSOP (GN), 0.635mm pitch, exposed pad not present. RoHS-compliant, Pb-free (PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (1) | Top gate driver output | Floating high-side driver sourcing up to 5A peak; requires BOOST-to-SW 1µF bypass for charge-pump operation. |
| SW (2) | Switching node connection | Return path for TG driver; also input to current limit comparator during QB conduction. |
| IMAX (3) | Switcher current limit threshold | 10µA internal pull-up sets overcurrent trip point via resistor to PGND; Kelvin-connected for accuracy. |
| RUN/SS (4) | Soft-start and shutdown control | 3µA internal current source sets turn-on ramp; pulled low with REGILM to enter shutdown (<150µA IQ). |
| COMP (5) | Error amplifier output | Direct connection to PWM comparator; accepts Type 3 compensation network for >60° phase margin. |
| FB (6) | Switcher feedback input | Virtual ground node referenced to 0.8V internal bandgap; sets VOUTSW = 0.8V × (1 + R1/R2). |
| REGDR (7) | Linear regulator driver output | Sources >30mA base current to external NPN; dropout voltage ≤1.1V at 30mA load. |
| GND (8) | Signal ground reference | Low-impedance return for FB, COMP, RUN/SS; must be star-connected to PGND near VIN capacitor. |
| REGFB (9) | Linear regulator feedback input | Regulated to 0.8V; sets VOUTREG = 0.8V × (1 + R1/R2); line/load regulation ±0.2%. |
| REGILM (10) | Linear current limit & enable | Internally servoed to 0.8V; RREGILM programs drive current limit; CDELAY adds programmable start-up delay. |
| VCC (11) | Core logic supply | 3.15V–5.5V input powering internal circuits except gate drivers; bypassed with ≥10µF to GND. |
| PGOOD (12) | Power-good status flag | Open-drain output; pulls low if either regulated output falls outside ±10%; requires external pull-up. |
| PGND (13) | Power ground return | High-current return for BG driver and external MOSFET sources; separate from signal GND. |
| BG (14) | Bottom gate driver output | Ground-referenced driver sinking/sourcing >1A continuous; drives QB gate with 0.5Ω impedance. |
| PVCC (15) | Bottom gate driver supply | Must exceed VGS(ON) of QB; typically tied to VIN; bypassed with ≥10µF to PGND. |
| BOOST (16) | Top gate driver supply | Floating supply for TG; charged via Schottky diode from VIN; bypassed 1µF to SW. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | VDS sensing across QB eliminates power loss and component count in high-current paths. |
| Burst Mode™ operation | Automatically engages below ~1A load to reduce switching losses and maintain >85% efficiency at light loads. |
| Dual independent enable controls | RUN/SS and REGILM allow staged power-up, independent shutdown, or coordinated entry into ultra-low-IQ mode. |
| Programmable linear current limit | RREGILM sets maximum base drive; foldback protection reduces dissipation in D44H11 during output short. |
| Integrated PGOOD monitoring | Single open-drain output confirms regulation of both switcher and linear outputs within ±10% simultaneously. |
Applications
| Processor Core Supply | FPGA I/O Bank Supply |
|---|---|
Use Scenario: Providing tightly regulated 1.8V/15A main rail to an FPGA or ASIC core with fast load transients during logic switching. IC Role / Device Role / Timing Role: Primary switching regulator controller managing synchronous buck topology with external FDS6670A MOSFETs. Use Value: ±1.5% DC accuracy and 550kHz switching ensure stable core voltage under dynamic loads without external LDO post-regulation. | Use Scenario: Generating a clean, low-noise 1.5V/2A auxiliary rail for FPGA I/O banks requiring independent sequencing and current limiting. IC Role / Device Role / Timing Role: Linear regulator controller driving external D44H11 NPN transistor with programmable start-up delay and foldback protection. Use Value: Programmable CDELAY on REGILM enables controlled ramp-up to avoid I/O bank contention; foldback prevents thermal runaway during hot-swap events. |
| Telecom Line Card Power | Industrial PLC Module |
Use Scenario: Dual-rail power solution for telecom line cards needing 3.3V/12A switcher output and 2.5V/1.8A linear output from 5V backplane. IC Role / Device Role / Timing Role: Dual-controller IC delivering independent, monitored outputs with shared PGOOD assertion for system-level fault reporting. Use Value: Single-chip integration reduces BOM count and PCB area; ±10% PGOOD window enables reliable brown-out detection before downstream logic resets. | Use Scenario: Power management for ruggedized PLC modules operating in –40°C to 85°C ambient with strict EMI requirements. IC Role / Device Role / Timing Role: Voltage-mode buck controller eliminating slope compensation and subharmonic oscillation risks in noisy industrial environments. Use Value: Constant-frequency 550kHz operation confines noise to predictable band; no external current sense resistor improves reliability in vibration-prone enclosures. |
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#PBF | No Burst Mode™; continuous switching at light loads eliminates low-frequency ripple but reduces light-load efficiency. | Suitable where output ripple spec prohibits Burst Mode™ artifacts, e.g., sensitive analog subsystems. | Select LTC1704BEGN#PBF when low-noise linear-like behavior at light loads outweighs efficiency concerns. |
| TPS54620RGYR | Single-output, 600kHz synchronous buck controller with integrated MOSFETs; no linear regulator controller. | Requires external LDO for second rail; lacks dual-PGOOD monitoring and programmable linear current limit. | Choose TPS54620RGYR only when system needs only one high-current rail and space constraints favor integrated-FET solution. |
Compared with LTC1704BEGN#PBF, the LTC1704EGN#PBF trades light-load ripple performance for higher efficiency via Burst Mode™; compared with TPS54620RGYR, it provides true dual-rail control with integrated linear regulation capability and unified fault monitoring-enabling simpler, more robust multi-voltage designs.
Availability
LTC1704EGN#PBF is available at Aetrix Electronics and suitable for industrial PLC modules, telecom line cards, FPGA-based embedded systems, and high-density server power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LTC1704EGN#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1704 product line was designed for high-efficiency, dual-rail DC/DC conversion in space-constrained embedded systems-emphasizing precision regulation, thermal resilience, and simplified layout through integrated controllers and elimination of current sense resistors.
FAQ
What is the primary function of the LTC1704EGN#PBF?
The LTC1704EGN#PBF is a dual-output power management IC combining a 550kHz synchronous buck switching regulator controller and a linear regulator controller. It drives external N-channel MOSFETs for the main rail (e.g., 1.8V/15A) and an external NPN transistor for the auxiliary rail (e.g., 1.5V/2A), delivering ±1.5% accuracy on the switcher output and ±2% on the linear output. The LTC1704EGN#PBF integrates PGOOD monitoring, Burst Mode™ operation, and programmable current limiting-all in a 16-pin narrow SSOP package.
How does Burst Mode™ operation improve efficiency in the LTC1704EGN#PBF?
Burst Mode™ operation in the LTC1704EGN#PBF reduces switching activity at light loads (typically <1A), significantly lowering quiescent current to <150µA and maintaining >85% efficiency where continuous PWM would waste energy. This feature is exclusive to the LTC1704 variant-LTC1704BEGN#PBF omits Burst Mode™ to eliminate low-frequency output ripple. The LTC1704EGN#PBF automatically transitions into and out of Burst Mode™ based on load current, with no external control required.
What external components are required for the LTC1704EGN#PBF switcher stage?
The LTC1704EGN#PBF switcher stage requires two external N-channel MOSFETs (e.g., FDS6670A), one output inductor (e.g., 0.68µH), input and output capacitors (e.g., 330µF/10V and 180µF/4V), a BOOST-to-SW 1µF bypass capacitor, and a Schottky diode from VIN to BOOST for charge-pumping. A resistor divider from VOUTSW to FB sets output voltage; a resistor from IMAX to PGND programs current limit; and RC compensation between COMP and FB stabilizes the loop. No external current sense resistor is needed-the LTC1704EGN#PBF senses VDS across the bottom MOSFET.
Can the LTC1704EGN#PBF linear regulator drive a PNP pass transistor?
No-the LTC1704EGN#PBF linear regulator controller is specifically designed to drive an external NPN pass transistor in emitter-follower configuration, with REGDR sourcing base current and REGFB referenced to 0.8V. Driving a PNP would require sourcing current from the collector and sinking at the emitter-contrary to the LTC1704EGN#PBF's REGDR output architecture and internal reference polarity. Attempting PNP use would result in incorrect regulation or failure to regulate. The LTC1704EGN#PBF datasheet specifies D44H11 (NPN) as the reference pass device.
What is the purpose of the REGILM pin on the LTC1704EGN#PBF?
The REGILM pin on the LTC1704EGN#PBF serves two functions: (1) it programs the linear regulator's current limit threshold via an external resistor (RREGILM) that sets input current, which directly scales REGDR's maximum base drive; and (2) it acts as an enable/disable control-pulling REGILM to GND shuts off the linear regulator. An external capacitor (CDELAY) on REGILM adds programmable start-up delay. The LTC1704EGN#PBF internally servos REGILM to 0.8V, making it incompatible with direct voltage-setting schemes.
LTC1704EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1704EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1704EGN#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 LTC1704EGN#PBF reliable?
The price and inventory of LTC1704EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1704EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1704EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1704EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1704EGN#PBF?
LTC1704EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1704EGN#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 LTC1704EGN#PBF?
For technical support, including LTC1704EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1704EGN#PBF requirements.
6.How does Aetrix verify that LTC1704EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1704EGN#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 LTC1704EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1704EGN#PBF?
All LTC1704EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1704EGN#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 LTC1704EGN#PBF part is unused and in its original packaging.
Return procedure for LTC1704EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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