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Analog Devices Inc. LTC1708EG-PG#PBF
- Part No.:
- LTC1708EG-PG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1708EG-PG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
LTC1708EG-PF 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 for high-efficiency step-down conversion. It supports input voltages from 3.5V to 36V, delivers ±1% output voltage accuracy, operates at adjustable fixed frequencies from 150kHz to 300kHz, and features out-of-phase operation to reduce input ripple in notebook CPU core power supplies.
For engineers reviewing the LTC1708EG-PG#PBF datasheet, LTC1708EG-PG#PBF pinout, LTC1708EG-PG#PBF application, or LTC1708EG-PG#PBF equivalent, key selection criteria include dual 180°-out-of-phase control, VID-programmable 0.925V–2.0V outputs, OPTI-LOOP® compensation, integrated 5V/3.3V standby regulators, and robust protection including foldback current limiting, overvoltage crowbar, and latched short-circuit shutdown.
Technical Context
The LTC1708EG-PG#PBF implements a constant-frequency current-mode architecture with two independent control loops operating 180° out of phase-reducing input capacitor RMS current and supply-induced noise. Each channel uses a transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz) referenced to a precision 0.8V internal bandgap, with feedback via EAIN1/EAIN2 pins and remote sense capability.
It integrates dual gate drivers (TG1/BG1 and TG2/BG2) capable of 3A peak current, supports dropout operation up to 99.4% duty cycle, and includes programmable soft-start via RUN/SS pins, selectable operating modes (Burst Mode®, forced continuous, or constant-frequency), and dual independent current sensing with foldback limiting based on VSENSE thresholds (62–88 mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide battery chemistries and industrial input rails without external pre-regulation. |
| Output Voltage Range | 0.925V to 2.00V via 5-bit VID - enables precise microprocessor core voltage scaling in 25mV/50mV steps. |
| Frequency Range | 150kHz to 300kHz (adjustable via FREQSET pin) - balances efficiency, size, and EMI performance across load conditions. |
| Output Accuracy | ±1% over temperature and line/load - ensures stable CPU core voltage compliance under dynamic load transients. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation near VIN ≈ VOUT, critical for high-current, low-voltage applications. |
| PGOOD Threshold | ±7.5% of programmed output - provides reliable system-level power sequencing and fault detection for both outputs. |
| Standby Current | 20µA in shutdown - minimizes quiescent drain in portable systems during sleep states. |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.025" pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 85°C/W; maximum junction temperature TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 23) | Soft-start & run control inputs | Capacitor-based ramp controls startup current slew rate; also triggers timed latchoff during sustained overcurrent. |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− (Pins 2,3,13,14) | Differential current sense inputs | Measure RSENSE voltage drop to set per-channel current limit; support foldback behavior below 70% nominal VOUT. |
| EAIN1, EAIN2 (Pins 4, 12) | Feedback voltage inputs | Accept remote-sensed output divider voltage; compared to 0.8V reference to regulate VOUT with ±1% accuracy. |
| VID0–VID4 (Pins 17–21) | 5-bit digital voltage programming inputs | Select one of 32 discrete output voltages between 0.925V and 2.00V; logic high = VIDVCC or float, low = GND. |
| TG1, TG2 (Pins 35, 24) | Top-gate N-MOSFET drivers | Floating drivers with INTVCC-referenced swing; drive external high-side MOSFETs in synchronous buck topology. |
| BG1, BG2 (Pins 31, 27) | Bottom-gate N-MOSFET drivers | Ground-referenced drivers delivering up to 3A peak current to synchronous rectifiers. |
| PGOOD (Pin 36) | Open-drain power-good indicator | Asserts low when either output deviates >±7.5% from target - used for system enable/disable sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable transient response across wide range of output capacitance (ceramic or polymer) and ESR without loop redesign. |
| Out-of-Phase Dual Control | Reduces input ripple current by ~70% vs. in-phase operation - cuts required CIN volume and lowers EMI filtering burden. |
| Integrated Standby Regulators | On-chip 5V (50mA peak) and 3.3V (10mA DC / 50mA peak) LDOs eliminate need for external bias rails in portable systems. |
| Selectable Operating Modes | Burst Mode® (high light-load efficiency), forced continuous (low-noise PWM), or constant-frequency (discontinuous conduction). |
| Robust Protection Suite | Includes foldback current limiting, output overvoltage crowbar, latched short-circuit shutdown with defeat option, and UVLO. |
Applications
| Mobile CPU Core Power | Notebook System Power |
|---|---|
|
Use Scenario: Providing dynamically scaled core voltage to Intel Pentium M or AMD Mobile Athlon processors in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing VID-programmed VCORE and VI/O rails with coordinated soft-start and PGOOD sequencing. Use Value: Enables <1% output regulation error across 0–15A load steps while reducing input capacitor count by 50% via 180° phase interleaving. |
Use Scenario: Generating main logic rail (1.5V/4A) and auxiliary rail (0.925V/14.1A) in clamshell-form factor laptops with thermal constraints. IC Role / Device Role / Timing Role: Dual-output controller with independent RUN/SS timing, remote sensing, and integrated 3.3V/5V standby supplies for chipset wake-up circuitry. Use Value: Eliminates four external LDOs and simplifies BOM while maintaining ±7.5% PGOOD window for BIOS-controlled power sequencing. |
| Portable Instrumentation | Industrial Embedded Computing |
|
Use Scenario: Powering FPGA I/O banks and analog front-end ADCs in handheld test equipment with battery input (7–28V). IC Role / Device Role / Timing Role: High-efficiency dual-buck controller supporting Burst Mode® for <100µA quiescent current during measurement idle periods. Use Value: Extends battery life by >35% at light loads versus fixed-frequency alternatives, while maintaining <20mV output ripple during active acquisition. |
Use Scenario: Delivering tightly regulated 1.2V/10A and 1.8V/6A rails to ARM Cortex-A series SoCs in fanless industrial gateways. IC Role / Device Role / Timing Role: Robust dual-phase controller with -40°C to +85°C guaranteed operation, foldback current limiting, and overvoltage crowbar for unattended 24/7 deployment. Use Value: Ensures system uptime via latched shutdown on sustained overload - prevents thermal runaway in sealed enclosures without airflow. |
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 |
|---|---|---|---|
| ISL6260CRZ-T | Single 5-bit VID channel; no integrated 3.3V/5V LDOs; requires external bootstrap diodes. | Limited to single-output VID applications; lacks standby regulators needed for full-system power management. | Choose when only one programmable rail is required and board space allows discrete LDOs. |
| TPS51220ARGER | Supports 3-phase operation; lower max VIN (24V); no OPTI-LOOP® - requires external compensation network. | Better suited for higher-current (>25A) CPU VRMs but incompatible with 36V industrial inputs or ceramic-capacitor-only designs. | Prefer for server-class mobile platforms where multi-phase scalability outweighs simplicity and wide-VIN needs. |
Compared with ISL6260CRZ-T and TPS51220ARGER, the LTC1708EG-PG#PBF uniquely combines dual independent VID channels, integrated dual LDOs, wide 3.5–36V input, and OPTI-LOOP® stability - making it optimal for compact, self-contained dual-rail embedded power systems requiring minimal external components and guaranteed -40°C to +85°C operation.
Availability
LTC1708EG-PG#PBF is available at Aetrix Electronics and suitable for notebook CPU core power, portable instrumentation, and industrial embedded computing requiring stable component supply, long-term lifecycle support, and guaranteed extended temperature performance.
Supply support for LTC1708EG-PG#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, serving industrial, automotive, communications, and computing markets.
The LTC1708EG-PG#PBF belongs to Linear's legacy high-efficiency power controller family, designed specifically for mobile and portable computing applications demanding precise VID control, dual-phase interleaving, and integrated system power management functions.
FAQ
What is the guaranteed operating temperature range for the LTC1708EG-PG#PBF?
The LTC1708EG-PG#PBF is fully specified and guaranteed over 0°C to +70°C. Performance over –40°C to +85°C is assured by design, characterization, and statistical process control - enabling use in industrial embedded systems where extended temperature validation is required but full automotive qualification is not needed. The device's thermal design supports TJMAX = 125°C with θJA = 85°C/W.
How does the OPTI-LOOP® compensation in the LTC1708EG-PG#PBF simplify design?
The OPTI-LOOP® compensation in the LTC1708EG-PG#PBF eliminates the need for external type-II or type-III compensation networks. Its adaptive transconductance amplifier (gm = 1.3 mmho, GBW = 3 MHz) automatically stabilizes the control loop across diverse output capacitors - including low-ESR ceramics, polymer, and electrolytic types - without requiring re-tuning. This reduces design iterations and accelerates time-to-market for dual-output power supplies.
Can the LTC1708EG-PG#PBF support both Burst Mode® and constant-frequency operation?
Yes, the LTC1708EG-PG#PBF supports three distinct low-load operating modes via the FCB pin: Burst Mode® (FCB < 0.8V), constant-frequency discontinuous mode (FCB tied to INTVCC), and forced continuous PWM (FCB = GND). This flexibility allows designers to optimize for light-load efficiency (Burst Mode®), low-noise operation (constant frequency), or bidirectional current capability (forced continuous), all using the same LTC1708EG-PG#PBF IC.
What protection features are built into the LTC1708EG-PG#PBF?
The LTC1708EG-PG#PBF integrates multiple hardware-based protections: foldback current limiting triggered by VSENSE threshold (62–88 mV), output overvoltage crowbar (trip at +7.5% of 0.8V reference), latched short-circuit shutdown with optional defeat via RUN/SS pull-up, undervoltage lockout (UVLO at 3.5–4.0V), and thermal shutdown at TJ = 125°C. These operate independently per channel and require no firmware or external supervision.
Does the LTC1708EG-PG#PBF include internal voltage regulators?
Yes, the LTC1708EG-PG#PBF integrates two independent linear regulators: a 5V LDO (INTVCC, 50mA peak) powering internal logic and gate drivers, and a 3.3V LDO (3.3VOUT, 10mA DC / 50mA peak) for system wake-up circuitry. Both regulators are enabled or disabled via the STBYMD pin, allowing flexible power-state management without external bias supplies - a key advantage in space-constrained portable designs.
LTC1708EG-PG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1708EG-PG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1708EG-PG#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 LTC1708EG-PG#PBF reliable?
The price and inventory of LTC1708EG-PG#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1708EG-PG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1708EG-PG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1708EG-PG#PBF?
LTC1708EG-PG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1708EG-PG#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 LTC1708EG-PG#PBF?
For technical support, including LTC1708EG-PG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1708EG-PG#PBF requirements.
6.How does Aetrix verify that LTC1708EG-PG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1708EG-PG#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 LTC1708EG-PG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1708EG-PG#PBF?
All LTC1708EG-PG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1708EG-PG#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 LTC1708EG-PG#PBF part is unused and in its original packaging.
Return procedure for LTC1708EG-PG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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