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Analog Devices Inc. LTC1702AIGN#PBF
- Part No.:
- LTC1702AIGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1702AIGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
LTC1702AIGN#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous buck switching regulator controller optimized for high-efficiency, low-input-voltage DC/DC conversion in microprocessor and ASIC core/I/O power supplies. It integrates two independent voltage-mode PWM controllers operating at 550kHz, each driving external N-channel MOSFET pairs without current-sense resistors, delivering 1A–25A per channel with ±1% total output regulation and <100µA shutdown current.
For engineers reviewing the LTC1702AIGN#PBF datasheet, LTC1702AIGN#PBF pinout, LTC1702AIGN#PBF application, or LTC1702AIGN#PBF equivalent, key selection considerations include its 2-phase interleaved operation for reduced input ripple, Burst Mode® for light-load efficiency, on-chip 0.8V reference trimmed to ±0.5%, latched overvoltage fault protection, and compatibility with standard 24-pin narrow SSOP layouts in space-constrained logic supply designs.
Technical Context
The LTC1702AIGN#PBF implements two fully independent voltage-mode feedback loops with 25MHz gain-bandwidth error amplifiers, enabling complex pole-zero compensation for fast transient response. Each channel features dedicated RUN/SS, COMP, FB, IMAX, PGOOD, and gate drive pins (TG/BG), with shared FCB and FAULT signals coordinating cross-channel behavior.
Its architecture eliminates external current-sense resistors via VDS-based current limiting and uses floating BOOST-supplied TG drivers with integrated nonoverlap timing (40–100ns) to ensure safe N-MOSFET switching. Phase separation is fixed at 180°, reducing input capacitor RMS current by ~48% versus single-phase operation while maintaining constant 550kHz frequency across temperature (±2.5% typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz nominal; enables use of ≤1µH inductors and compact ceramic output capacitors without compromising transient performance. |
| Output Regulation Accuracy | ±1% total (line/load/temp); achieved via 0.8V internal reference trimmed to ±0.5% and high-PSRR error amplifier. |
| Per-Channel Output Current | 1A to 25A; scalable via external N-MOSFET selection-no current-sense resistor required. |
| Shutdown Supply Current | <100µA; achieved by disabling both RUN/SS pins, enabling ultra-low-power system standby modes. |
| Overvoltage Fault Threshold | +15% above regulated output (e.g., 3.795V for 3.3V rail); latched FAULT output pulls BG high to clamp output until power cycle. |
| Operating Temperature Range | –40°C to +85°C (I-grade); validated for industrial and embedded computing environments with thermal shutdown at 125°C. |
| Package | 24-pin narrow SSOP (0.150" width); 0.025" pitch, 7.6mm × 4.4mm footprint compatible with automated SMT assembly. |
Pinout & Package
Package: 24-pin narrow-body SSOP (GN), 0.150" wide, JEDEC MS-013AC compliant. Exposed pad not present; thermal dissipation via PCB copper area under package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVCC (1) | Driver Power Supply Input | Supplies BG/TG drivers; must be ≥VGS(ON) of bottom MOSFETs-typically tied to VIN for optimal RDS(on) control. |
| BOOST1 (2), BOOST2 (23) | Floating Top-Gate Driver Supply | Provides gate drive voltage referenced to SW node; bypassed to SW with 1µF capacitor to enable full enhancement of top N-MOSFETs. |
| TG1 (4), TG2 (21) | Top N-MOSFET Gate Drive Output | High-side driver with 0.5Ω RON; sinks up to 5A peak; requires direct connection to MOSFET gate-no series resistor. |
| BG1 (3), BG2 (22) | Bottom N-MOSFET Gate Drive Output | Low-side driver with 0.5Ω RON; sources up to 5A peak; pulled high during FAULT latch to clamp output voltage. |
| IMAX1 (6), IMAX2 (24) | Current Limit Threshold Input | Sets valley-current limit via external resistor to PGND; internal 10µA pull-up enables precise threshold programming (e.g., 15mV = 15A with 1mΩ sense). |
| PGOOD1 (7), PGOOD2 (18) | Open-Drain Power-Good Indicator | Asserts low when FB falls >5% below target; used for sequencing and system enable-requires external pull-up. |
| FAULT (17) | Latched Overvoltage Fault Output | Open-drain output pulled high during OV fault (>15% overregulation); disables entire IC until VCC cycle-tie to PGND to disable latching. |
| RUN/SS1 (9), RUN/SS2 (16) | Channel Enable / Soft-Start Control | Pull low to disable channel; internal 3.5µA current source charges external capacitor for controlled ramp-up (e.g., 1µF = ~500ms soft-start). |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Interleaved Operation | Fixed 180° phase shift between channels reduces input capacitor RMS current by ~48%, enabling smaller, lower-cost CIN and lower EMI. |
| Burst Mode® Efficiency Optimization | Automatically transitions to discontinuous conduction then Burst Mode at light loads-maintains >80% efficiency down to 10mA output current. |
| VDS-Based Current Sensing | Eliminates external current-sense resistors by monitoring bottom MOSFET RDS(on) voltage drop-reduces BOM count and power loss in high-current paths. |
| Integrated 0.8V Reference | Trimmed to ±0.5% over temperature; enables accurate low-VOUT regulation (e.g., 0.8V–3.3V) without external DAC or level-shifting circuitry. |
| True Voltage-Mode PWM Control | No slope compensation required; stable with wide range of output LC combinations-simplifies loop compensation vs. current-mode alternatives. |
Applications
| Microprocessor Core Supply | Dual-Voltage Logic System |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/1.8V core and I/O rails to Intel/AMD CPUs or ARM-based SoCs in laptops and servers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing independent 2-phase power stages with coordinated soft-start and fault signaling. Use Value: Achieves ±1% regulation and sub-100µs load-step response using 1µH inductors and ceramic output caps-enabling CPU frequency scaling without voltage droop. |
Use Scenario: Generating 3.3V and 2.5V supplies for mixed-voltage FPGA I/O banks and memory interfaces in telecom baseband cards. IC Role / Device Role / Timing Role: Independent dual-output controller with separate RUN/SS and PGOOD signals enabling precise power sequencing and rail isolation. Use Value: Eliminates need for discrete current-sense resistors and external op-amps-reducing solution size by 35% versus discrete controller + driver implementations. |
| 2-Step Distributed Power | High-Density ASIC Power Delivery |
Use Scenario: Secondary regulation stage converting 5V intermediate bus to 1.0V/1.2V for AI accelerator ASICs in data center accelerators. IC Role / Device Role / Timing Role: High-frequency (550kHz), 2-phase controller minimizing input ripple on shared 5V bus while maximizing efficiency across 1–25A dynamic load range. Use Value: Reduces RMS input current by 48% vs. single-phase-allowing use of three 330µF X5R ceramics instead of six, cutting board area by 22mm². |
Use Scenario: Powering multi-core network processors requiring simultaneous 1.1V core, 1.8V I/O, and 3.3V auxiliary rails in 1U switch line cards. IC Role / Device Role / Timing Role: Dual-channel controller with latched FAULT and independent PGOOD outputs supporting fail-safe power management and hot-swap compliance. Use Value: Integrated 15% OV latch prevents ASIC damage during transient overvoltage events-eliminating need for external supervisor ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2952GQ-Z (Monolithic Power) | Single-chip dual-phase controller with integrated MOSFET drivers and PMBus interface; 600kHz switching; no Burst Mode®. | Requires digital configuration via PMBus; lacks analog PGOOD/FAULT latching; better suited for systems with firmware-based power management. | Select MP2952GQ-Z when digital telemetry and adaptive voltage positioning (AVP) are required; avoid if analog sequencing or latch-on-fault is mandatory. |
| ISL95836IRZ-T7A (Renesas) | 3+1 phase controller with integrated drivers; supports VR12.5/13 protocols; 1MHz max frequency; no VDS current sensing. | Designed for CPU VR applications with dynamic VID control; requires external current-sense resistors; incompatible with simple resistor-programmed IMAX. | Select ISL95836IRZ-T7A only for Intel-compatible VR applications needing VID interface; LTC1702AIGN#PBF remains preferred for fixed-output, analog-controlled systems. |
Compared with MP2952GQ-Z and ISL95836IRZ-T7A, the LTC1702AIGN#PBF offers superior analog simplicity-no firmware dependency, no external current-sense resistors, and deterministic latched fault behavior-making it ideal for cost-sensitive, high-reliability industrial and embedded logic supplies where digital complexity adds unnecessary risk.
Availability
LTC1702AIGN#PBF is available at Aetrix Electronics and suitable for microprocessor core supplies, dual-voltage FPGA I/O systems, 2-step distributed power architectures, and high-density ASIC power delivery requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1702AIGN#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for legacy Linear parts including the LTC1702A series.
The LTC1702AIGN#PBF belongs to Linear's high-performance power management portfolio, designed specifically for low-voltage, high-current logic supplies in computing, networking, and industrial systems where precision regulation, thermal efficiency, and layout simplicity are critical.
FAQ
What is the maximum input voltage supported by the LTC1702AIGN#PBF?
The LTC1702AIGN#PBF supports a maximum VCC and PVCC supply voltage of 7V. The BOOST pin voltage must not exceed 15V, and the voltage difference between BOOST and SW pins must remain within 7V. These absolute maximum ratings ensure safe operation when driving standard logic-level N-channel MOSFETs from common 5V intermediate buses.
Does the LTC1702AIGN#PBF require external current-sense resistors for overcurrent protection?
No, the LTC1702AIGN#PBF does not require external current-sense resistors. It implements VDS-based current limiting by monitoring the voltage drop across the bottom N-MOSFET during conduction. The IMAX1 and IMAX2 pins set the threshold using a single external resistor to PGND, eliminating power loss and board space associated with shunt resistors.
How does the 2-phase interleaved operation of the LTC1702AIGN#PBF improve system efficiency?
The LTC1702AIGN#PBF operates its two channels 180° out of phase, interleaving switching currents into the input capacitor. This reduces RMS input current by approximately 48% compared to single-phase operation, lowering conduction losses in the input path, permitting smaller/cheaper input capacitors, and reducing conducted EMI-directly improving overall system efficiency and thermal performance.
Can the LTC1702AIGN#PBF be used for output voltages below 0.8V?
No, the LTC1702AIGN#PBF cannot regulate below 0.8V directly because its internal reference is fixed at 0.8V. Output voltages are set by resistor dividers from VOUT to FB, so the minimum achievable VOUT equals the reference voltage (0.8V). For sub-0.8V rails, an external reference or level-shifting amplifier would be required-outside the intended use case of the LTC1702AIGN#PBF.
What happens to the LTC1702AIGN#PBF during an overvoltage fault condition?
When either output exceeds +15% of its programmed voltage for more than 25µs, the LTC1702AIGN#PBF asserts the open-drain FAULT pin high and latches off all switching activity. Both BG pins go high, turning on the bottom MOSFETs to clamp the output. The device remains latched until VCC is cycled-this behavior is inherent to the LTC1702AIGN#PBF's fault architecture and requires no external components to implement.
LTC1702AIGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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):
- 3V ~ 7V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1702AIGN#PBF FAQ
1.How can I place an order for LTC1702AIGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1702AIGN#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 LTC1702AIGN#PBF reliable?
The price and inventory of LTC1702AIGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1702AIGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1702AIGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1702AIGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1702AIGN#PBF?
LTC1702AIGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1702AIGN#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 LTC1702AIGN#PBF?
For technical support, including LTC1702AIGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1702AIGN#PBF requirements.
6.How does Aetrix verify that LTC1702AIGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1702AIGN#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 LTC1702AIGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1702AIGN#PBF?
All LTC1702AIGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1702AIGN#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 LTC1702AIGN#PBF part is unused and in its original packaging.
Return procedure for LTC1702AIGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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