My Inquiry
My Account
Analog Devices Inc. LTC1708EG-PG#TRPBF
- Part No.:
- LTC1708EG-PG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1708EG-PG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1708EG-PG from Analog Devices (formerly Linear Technology) is a dual-phase, current-mode synchronous buck DC/DC controller with 5-bit VID voltage programming, driving two independent N-channel MOSFET stages. It delivers ±1% output voltage accuracy, supports 0.925V–2.0V outputs via VID inputs, operates from 3.5V–36V input, and features out-of-phase switching to reduce input ripple-used in notebook CPU core power supplies.
For engineers reviewing the LTC1708EG-PG datasheet, LTC1708EG-PG pinout, LTC1708EG-PG application, or LTC1708EG-PG equivalent, key selection considerations include dual-channel phase interleaving, OPTI-LOOP® compensation for wide capacitor ESR tolerance, 150kHz–300kHz adjustable switching frequency, and integrated 3.3V/5V standby regulators for system-level power sequencing.
Technical Context
The LTC1708EG-PG implements a constant-frequency current-mode control architecture with two 180° out-of-phase channels, enabling reduced input capacitance requirements and lower EMI. Each channel uses a precision 0.8V reference, differential current sensing (SENSE±), and ITH-based error amplifier output to modulate peak inductor current.
It integrates VID decoding logic for mobile processor voltage scaling, dual gate drivers (TG/BG) with <90ns transition times, and protection features including foldback current limiting, latched short-circuit shutdown (defeatable via RUN/SS discharge), and output overvoltage crowbar (0.84–0.88V threshold at EAIN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.925V to 2.00V programmable via 5-bit VID inputs; supports mobile CPU core rail scaling with 25mV/50mV steps. |
| Input Voltage Range | 3.5V to 36V; accommodates 12V industrial rails, 5V/3.3V systems, and wide-range battery inputs (e.g., 4S Li-ion). |
| Switching Frequency | 150kHz to 300kHz (adjustable via FREQSET pin); enables optimization of inductor size vs. efficiency across load conditions. |
| Output Voltage Accuracy | ±1% over temperature and line/load; ensures stable core voltage under dynamic CPU load transients. |
| Duty Cycle Max | 98–99.4%; supports ultra-low dropout operation near VIN ≈ VOUT, critical for high-current low-voltage rails. |
| PGOOD Threshold | ±7.5% window around programmed output; provides reliable power-good assertion for CPU reset and sequencing logic. |
| Standby Current | 20µA shutdown current; enables low-power suspend states in portable computing platforms. |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.025" pitch, JEDEC MS-013AC, 12.8mm × 7.6mm footprint, θJA = 85°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 23) | Soft-start & latchoff timer control | Capacitor-connected pins set soft-start ramp time; falling below 1.0V shuts down respective channel; used for timed short-circuit detection. |
| SENSE1+, SENSE2+ / SENSE1−, SENSE2− (Pins 2,14 / 3,13) | Differential current sense inputs | Measure voltage across RSENSE to regulate peak inductor current; common-mode range up to INTVCC + 0.1V. |
| EAIN1, EAIN2 (Pins 4, 12) | Remote feedback voltage input | Accepts resistive divider output from VOUT; compared to 0.8V internal reference to close voltage loop. |
| FREQSET (Pin 5) | Oscillator frequency control | Open = ~220kHz; grounded = ~140kHz; 2.4V = ~310kHz; enables EMI spread-spectrum tuning or noise-sensitive layout optimization. |
| VID0–VID4 (Pins 17–21) | 5-bit digital voltage select inputs | Program 32 discrete output voltages between 0.925V and 2.00V; LSB = 25mV (low range) or 50mV (high range). |
| TG1, TG2 / BG1, BG2 (Pins 35,24 / 31,27) | Top/bottom N-MOSFET gate drivers | Drive external N-channel FETs with <90ns rise/fall; TG swing = INTVCC superimposed on SW node; BG swing = GND to INTVCC. |
| PGOOD (Pin 36) | Open-drain power-good indicator | Asserts low when either EAIN voltage deviates >±7.5% from 0.8V; synchronizes CPU reset and system enable signals. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide range of output capacitor types (ceramic, polymer, SP) and ESR values without external compensation redesign. |
| Out-of-Phase Dual Control | Reduces RMS input ripple current by ~70% versus single-phase design, cutting required CIN volume and cost by ≥50%. |
| VID-Controlled Core Power | Direct interface to Intel Mobile Voltage Identification (VID) protocols; eliminates need for external DAC or microcontroller in CPU power delivery. |
| Three-Mode Operation Selection | FCB pin selects Burst Mode (light-load efficiency), Constant Frequency (low-noise), or Forced Continuous (reverse-current capability). |
| Integrated Standby Regulators | On-chip 3.3V/10mA and 5V/50mA LDOs provide always-on power for wake-up logic, SMBus controllers, or RTC circuits-no external regulators needed. |
Applications
| Mobile CPU Core Power Supply | Notebook System Power Sequencing |
|---|---|
|
Use Scenario: Delivering dynamically scaled core voltage (0.925V–2.0V) to Intel Pentium M or AMD Mobile Athlon processors during active/idle transitions. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing phase-interleaved PWM generation, VID decoding, and PGOOD signaling for CPU reset coordination. Use Value: Achieves >90% efficiency at 15A load while maintaining <±1% regulation and <10µs PGOOD assertion-meeting mobile platform VR10.x compliance. |
Use Scenario: Providing coordinated 1.5V I/O, 3.3V peripheral, and 5V standby rails in clamshell-form-factor notebooks with thermal constraints. IC Role / Device Role / Timing Role: Primary controller for main CPU rail plus integrated 3.3V/5V LDOs powering EC, keyboard controller, and lid-open sensors. Use Value: Eliminates three discrete LDOs; STBYMD pin enables "always-on" 3.3V/5V during sleep, reducing BOM count and PCB area by 25%. |
| Industrial Embedded Computing | Portable Test Instrumentation |
|
Use Scenario: Powering ARM-based SoCs (e.g., i.MX6) in fanless DIN-rail controllers requiring wide VIN (12–36V) and -40°C to 85°C operation. IC Role / Device Role / Timing Role: High-reliability dual-output controller with UVLO (3.5V), overvoltage protection (0.84–0.88V), and latch-off short-circuit defense. Use Value: Maintains ±1% output accuracy across full temp range; 99.4% max duty cycle supports 3.3V-out from 3.6V input-critical for brownout resilience. |
Use Scenario: Generating precision 1.2V analog supply and 1.8V digital rail for handheld oscilloscopes with battery + adapter input (5–28V). IC Role / Device Role / Timing Role: Dual-channel controller with remote sensing (EAIN/ATTNIN), soft-start (RUN/SS), and burst mode for >85% light-load efficiency. Use Value: Reduces no-load power to <125µA; OPTI-LOOP® ensures stable response with 10µF ceramic output caps-enabling compact, low-noise analog supply design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6269CRZ-T | Single 5-bit VID channel only; no dual independent outputs; requires external phase-sync circuitry for interleaving. | Targeted at single-rail CPU cores; lacks integrated 3.3V/5V LDOs and ATTNIN/ATTNOUT VID feedback path. | Select when only one regulated output is needed and system already includes dedicated standby regulators. |
| TPS51220ARGER | Supports 3-phase operation; higher max output current (25A/channel); no VID inputs-uses analog IREF or SMBus. | Designed for modern mobile GPUs and multi-core CPUs requiring >20A per rail; lacks native VID compatibility. | Choose for post-2010 platforms using SMBus voltage commands instead of legacy VID bus; requires firmware integration. |
Compared with ISL6269CRZ-T and TPS51220ARGER, the LTC1708EG-PG uniquely combines dual independent VID-programmable outputs, integrated 3.3V/5V LDOs, and OPTI-LOOP® compensation-making it optimal for legacy mobile CPU power where pin-compatible VID support and minimal external components are mandatory.
Availability
LTC1708EG-PG is available at Aetrix Electronics and suitable for notebook CPU core power supplies, industrial embedded controllers, and portable instrumentation requiring stable component supply, long-lifecycle support, and guaranteed parametric performance over –40°C to 85°C.
Supply support for LTC1708EG-PG 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 ICs, serving aerospace, industrial, automotive, and communications markets.
The LTC1708EG-PG belongs to Linear's legacy high-efficiency power controller family, designed specifically for mobile computing applications requiring precise VID-controlled core voltage regulation with minimal external components.
FAQ
What is the maximum supported output current per channel for the LTC1708EG-PG?
The LTC1708EG-PG does not define a fixed maximum output current-it is a controller IC whose current capability depends on external MOSFET selection, inductor rating, and thermal design. Reference designs achieve 14.1A on Channel 1 and 4A on Channel 2 using IRF7811/IRF7809 FETs and appropriate layout. The gate drivers support peak currents up to 3A, enabling robust drive of low-RDS(on) N-channel devices for high-current applications.
Does the LTC1708EG-PG support both synchronous and asynchronous rectification?
No-the LTC1708EG-PG is designed exclusively for synchronous buck operation with dual N-channel MOSFET drive (TG/BG). It provides complementary high-side and low-side gate drive signals with non-overlap timing (90ns dead time) and cannot drive external Schottky diodes in place of the bottom FET. Asynchronous operation is not supported.
How does the FCB pin affect operating mode selection in the LTC1708EG-PG?
The FCB pin on the LTC1708EG-PG selects among three distinct operating modes: <0.8V forces continuous PWM (bidirectional current), 0.8V–(VINTVCC–2V) enables Burst Mode (high light-load efficiency), and ≥VINTVCC disables Burst Mode for constant-frequency discontinuous conduction. Leaving FCB floating is prohibited-must be tied to defined voltage or ground.
Can the LTC1708EG-PG be used without VID inputs for fixed-output applications?
Yes-the LTC1708EG-PG supports fixed-output operation by connecting EAIN1/EAIN2 directly to a resistive divider from VOUT, bypassing VID inputs entirely. In this configuration, VID0–VID4 may be left open or tied to VIDVCC; output voltage is set solely by the external resistor ratio, retaining all other features including PGOOD, soft-start, and dual-phase control.
What is the purpose of the ATTNIN and ATTNOUT pins on the LTC1708EG-PG?
ATTNIN and ATTNOUT implement an active voltage positioning (AVP) circuit for VID-controlled outputs. ATTNIN receives the full output voltage; ATTNOUT provides a buffered, divided-down version (set to 0.8V in regulation) that connects to EAIN. This allows precise tracking of VID-programmed voltage while rejecting noise and drop across PCB traces-critical for tight-tolerance CPU core rails.
LTC1708EG-PG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-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:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 30V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1708EG-PG#TRPBF FAQ
1.How can I place an order for LTC1708EG-PG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1708EG-PG#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 LTC1708EG-PG#TRPBF reliable?
The price and inventory of LTC1708EG-PG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1708EG-PG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1708EG-PG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1708EG-PG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1708EG-PG#TRPBF?
LTC1708EG-PG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1708EG-PG#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 LTC1708EG-PG#TRPBF?
For technical support, including LTC1708EG-PG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1708EG-PG#TRPBF requirements.
6.How does Aetrix verify that LTC1708EG-PG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1708EG-PG#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 LTC1708EG-PG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1708EG-PG#TRPBF?
All LTC1708EG-PG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1708EG-PG#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 LTC1708EG-PG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1708EG-PG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1708EG-PG#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
