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Analog Devices Inc. LTC1702IGN#TRPBF
- Part No.:
- LTC1702IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1702IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,352
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Product details
Overview
LTC1702IGN#TRPBF 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 core and I/O supply applications. It integrates two independent voltage-mode PWM controllers operating at 550kHz, each driving external N-channel MOSFET pairs without current-sense resistors, supporting 1A–25A per channel with ±1% output regulation accuracy and <100µA shutdown quiescent current.
For engineers reviewing the LTC1702IGN#TRPBF datasheet, LTC1702IGN#TRPBF pinout, LTC1702IGN#TRPBF application, or LTC1702IGN#TRPBF equivalent, key selection considerations include its 2-phase interleaved operation for reduced input ripple, integrated 0.8V reference trimmed to ±0.5%, FCB-controlled continuous/burst mode transition, latched FAULT protection, and 24-pin narrow SSOP package compatibility with high-density PCB layouts.
Technical Context
The LTC1702IGN#TRPBF implements a constant-frequency, voltage-mode PWM architecture with two fully independent control loops-each featuring a 25MHz GBW error amplifier, internal 0.8V reference, and MOSFET VDS-based current limiting via IMAX pins. Its 180° phase-shifted dual-channel operation reduces input capacitor RMS current by ~48% versus single-phase designs.
It supports true floating top-gate drive using BOOST-SW charge-pump topology, enabling full enhancement of high-side N-MOSFETs without auxiliary supplies. The device transitions automatically from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) and then to Burst Mode™ under light load, maintaining >85% efficiency down to 100mA per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz ±15% - enables use of ≤1µH inductors and compact ceramic output capacitors while avoiding IF interference bands. |
| Output Regulation Accuracy | ±1% total - includes line, load, and temperature effects; achieved via 0.8V 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 due to VDS sensing at SW node. |
| Shutdown Quiescent Current | <100µA - achieved by disabling both RUN/SS pins; critical for battery-backed or always-on system standby modes. |
| Operating Temperature Range | –40°C to +85°C - specified for industrial-grade performance; junction max = 125°C with θJA = 100°C/W. |
| Package | 24-pin narrow SSOP (GN) - 150mil body width, 0.635mm pitch; compatible with standard reflow profiles and automated assembly. |
| Phase Relationship | 180° out-of-phase - interleaves channel switching to halve input ripple frequency and reduce RMS input capacitor current by ~48%. |
Pinout & Package
Package: 24-pin narrow plastic SSOP (GN), 150mil body width, 0.635mm lead pitch, exposed pad not present. Thermal resistance θJA = 100°C/W.
| 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 with ≥1µF PGND bypass. |
| BOOST1 (2), BOOST2 (23) | Floating top-gate driver supply | Charged via external diode+capacitor from VIN; provides gate drive above SW node voltage for high-side N-MOSFETs. |
| TG1 (4), TG2 (21) | Top N-MOSFET gate drive output | High-side driver with 0.5Ω RON; returns to SWx; capable of 5A peak current; goes low in fault/shutdown. |
| BG1 (3), BG2 (22) | Bottom N-MOSFET gate drive output | Low-side driver with 0.5Ω RON; returns to PGND; pulls high during FAULT latch to clamp overvoltage. |
| SW1 (5), SW2 (20) | Switching node connection | Connects to source of QT and drain of QB; used for VDS current sensing and BOOST capacitor return. |
| IMAX1 (6), IMAX2 (24) | Current limit threshold set | Internal 10µA pull-up; sets overcurrent trip point via single resistor to PGND; eliminates external sense resistor. |
| PGOOD1 (7), PGOOD2 (18) | Open-drain power-good indicator | Asserts low when output is within ±5% of target; enables sequencing or system enable logic. |
| FCB (8) | Force Continuous Bar input | Pull to SGND to disable Burst Mode™; keeps both channels in CCM regardless of load; prevents light-load efficiency drop. |
| 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 (≈500ms/µF). |
| COMP1 (10), COMP2 (15) | Error amplifier output / compensation node | Direct connection to PWM comparator; accepts RC/RCR networks for loop stabilization; supports multi-pole compensation. |
| SGND (11) | Signal ground reference | Return for FB, COMP, RUN/SS, FCB; must be separated from PGND and joined only at single point near CIN. |
| FB1 (12), FB2 (14) | Voltage feedback input | Connects to resistor divider from VOUT; referenced to internal 0.8V bandgap; supports outputs ≥0.8V without level-shifting. |
| VCC (13) | Analog/logic supply input | Powers internal circuitry except drivers; 3V–7V range; requires ≥1µF bypass to SGND close to pin. |
| PGND (19) | Power ground return | Return path for BG drivers and external MOSFET sources; connect to high-current ground plane near CIN/COUT and MOSFETs. |
| FAULT (17) | Latched overvoltage fault output | Open-drain; trips if either output exceeds +15% for >25µs; pulls high to latch off entire IC until power cycle unless tied to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 550kHz PWM controllers | Enables two synchronized but separately configurable DC/DC rails (e.g., 3.3V/2.5V or 1.8V/1.2V) on one IC, reducing BOM count and layout area. |
| 180° interleaved 2-phase operation | Reduces input capacitor RMS current by ~48%, cuts EMI peaks, and allows smaller, lower-cost input bulk capacitance (e.g., 3×330µF instead of 6×330µF). |
| VDS-based current limiting | Eliminates external current-sense resistor and associated power loss in high-current paths; sets trip point with single precision resistor per channel. |
| Burst Mode™ with programmable entry | Automatically engages below ~10% load to maintain >85% efficiency; FCB pin allows forced CCM for noise-sensitive applications. |
| Latched overvoltage protection | Hardware-level FAULT pin asserts and disables all drivers if either output exceeds +15%; prevents damage to downstream logic or memory. |
| Integrated 25MHz GBW error amplifier | Supports complex compensation (e.g., Type III) for wide bandwidth and robust phase margin; enables fast transient response (<1% deviation @ 10A step). |
Applications
| Microprocessor Core Supply | Multi-Rail Logic Power |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/1.8V core and 2.5V/3.3V I/O rails to Intel/AMD CPUs or FPGA SoCs in notebook/desktop systems. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing independent voltage domains with precise sequencing and fast load-step response. Use Value: Achieves ±1% regulation and <1% transient deviation at 15A load steps, meeting CPU VRD specifications without external DAC or PMBus interface. |
Use Scenario: Generating multiple logic supply voltages (e.g., 3.3V, 2.5V, 1.8V) from a common 5V intermediate bus in telecom line cards or industrial PLCs. IC Role / Device Role / Timing Role: Dual-output DC/DC controller implementing 2-step regulation architecture to replace discrete single-rail solutions. Use Value: Reduces total solution size by 40% vs two separate controllers; 2-phase operation lowers input ripple, easing EMI filter design and certification. |
| Distributed Power Architecture | High-Density ASIC Power |
Use Scenario: Local point-of-load (POL) regulation for ASICs or GPUs located far from main 5V supply in server motherboards or AI accelerators. IC Role / Device Role / Timing Role: Compact dual controller delivering high-current, low-noise rails directly adjacent to heat-sensitive silicon. Use Value: 24-pin SSOP footprint fits tight spaces; 550kHz operation minimizes inductor size (1µH) and avoids audible noise; thermal design simplified by distributed loss. |
Use Scenario: Powering advanced ASICs with dynamic voltage/frequency scaling (DVFS) requiring rapid, accurate rail transitions. IC Role / Device Role / Timing Role: Voltage-mode controller with 25MHz error amplifier enabling aggressive loop compensation for sub-10µs recovery from 10A load transients. Use Value: Maintains <±3% output deviation during 10A/µs slew events; Burst Mode™ ensures >87% efficiency at idle, extending system runtime. |
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 |
|---|---|---|---|
| MP2953GQ-Z (Monolithic Power) | Single-chip dual controller with integrated MOSFETs (30V/40A); fixed 600kHz freq; no FCB or latched FAULT; uses current-mode control. | Lower component count but less flexible compensation and no programmable burst mode; unsuitable for >7V input or discrete MOSFET optimization. | Select MP2953GQ-Z only when board space is critical and integrated FETs meet voltage/current requirements; avoid for high-precision regulation or 2-step architectures. |
| ISL95836IRZ-T (Renesas) | 3-phase capable; supports Intel VR12.5/VR13 protocols; includes SVID interface; 500kHz base freq; no VDS current sense. | Designed for CPU VRMs with digital interface; requires external current-sense resistors; lacks standalone analog operation mode. | Choose ISL95836IRZ-T only for SVID-compliant CPU power delivery; LTC1702IGN#TRPBF remains preferred for general-purpose dual-rail analog control. |
Compared with MP2953GQ-Z and ISL95836IRZ-T, the LTC1702IGN#TRPBF offers superior analog regulation accuracy (±1% vs ±2%), flexible VDS current sensing, and hardware-configurable Burst Mode™-making it optimal for non-protocol-driven, high-stability POL applications where discrete MOSFET optimization is required.
Availability
LTC1702IGN#TRPBF is available at Aetrix Electronics and suitable for microprocessor core supplies, multi-rail logic power generation, and distributed point-of-load applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1702IGN#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 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1702IGN#TRPBF belongs to Linear's high-performance power management IC family, designed specifically for efficient, low-voltage, high-current DC/DC conversion in computing and communications infrastructure where precision regulation and thermal efficiency are critical.
FAQ
What is the maximum input voltage supported by the LTC1702IGN#TRPBF?
The LTC1702IGN#TRPBF supports a maximum VCC and PVCC supply voltage of 7V. The BOOST pin tolerates up to 15V, but the voltage difference between BOOST and SW must remain ≤7V. This makes the LTC1702IGN#TRPBF ideal for 5V intermediate bus applications, not direct battery or 12V input conversion.
Does the LTC1702IGN#TRPBF require external current-sense resistors?
No, the LTC1702IGN#TRPBF eliminates external current-sense resistors by using VDS sensing across the bottom N-MOSFET during conduction. The IMAX1 and IMAX2 pins set the current limit threshold with a single external resistor to PGND, reducing power loss and component count.
How does the 2-phase interleaving in the LTC1702IGN#TRPBF improve system performance?
The LTC1702IGN#TRPBF operates its two channels 180° out of phase, interleaving switching pulses to halve input ripple frequency and reduce RMS input capacitor current by ~48%. This allows smaller, lower-ESR input capacitors, lowers EMI emissions, and improves overall power stage efficiency without changing component ratings.
Can the LTC1702IGN#TRPBF operate with output voltages below 0.8V?
No-the LTC1702IGN#TRPBF's internal reference is fixed at 0.8V, and the FB pins are designed for resistive divider feedback. Outputs below 0.8V require external level-shifting circuitry; the device guarantees regulation only for VOUT ≥ 0.8V, such as 1.2V, 1.8V, 2.5V, or 3.3V rails.
What happens to the LTC1702IGN#TRPBF during an overvoltage fault condition?
When either output exceeds +15% of its programmed value for >25µs, the FAULT pin pulls high and the LTC1702IGN#TRPBF latches off-driving both BG pins high to clamp the outputs. Recovery requires a full power cycle unless FAULT is tied to PGND to disable latching, allowing automatic reset after fault removal.
LTC1702IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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):
- 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
LTC1702IGN#TRPBF FAQ
1.How can I place an order for LTC1702IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1702IGN#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 LTC1702IGN#TRPBF reliable?
The price and inventory of LTC1702IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1702IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1702IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1702IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1702IGN#TRPBF?
LTC1702IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1702IGN#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 LTC1702IGN#TRPBF?
For technical support, including LTC1702IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1702IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1702IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1702IGN#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 LTC1702IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1702IGN#TRPBF?
All LTC1702IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1702IGN#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 LTC1702IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1702IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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