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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC1629IG-PG#PBF

Name: LTC1629IG-PG#PBF
Brand: Analog Devices Inc.
SKU: LTC1629IG-PG#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC1629IG-PG#PBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 28-SSOP (0.209", 5.30mm Width)

Datasheet:: LTC1629IG-PG#PBF.pdf

Description:: IC REG CTRLR BUCK 28SSOP

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Product details

Overview

LTC1629IG-PG#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller designed for high-current DC/DC conversion in server and computing power supplies. It drives external N-channel MOSFETs, supports phase-lockable fixed-frequency operation from 150kHz to 300kHz, delivers ±1% output voltage accuracy, enables true remote differential sensing, and features a dedicated PGOOD output pin. It is used in 40A, 1.6V VRMs for desktop CPUs and memory subsystems.

For engineers reviewing the LTC1629IG-PG#PBF datasheet, LTC1629IG-PG#PBF pinout, LTC1629IG-PG#PBF application, or LTC1629IG-PG#PBF equivalent, key selection criteria include its PolyPhase™ dual-channel architecture, 28-lead SSOP package, 4V–36V input range, 99% duty cycle capability, and integrated OPTI-LOOP™ compensation for wide-output-capacitance stability.

Technical Context

The LTC1629IG-PG#PBF implements current-mode control with two independent, phase-shifted PWM channels synchronized via an internal PLL. Each channel uses a differential current-sense comparator referenced to SGND, with peak current threshold adjustable via ITH voltage (0–2.4V) and RSENSE (typical 75mV full-scale).

It integrates a true remote-sensing differential amplifier (VDIFFOUT, VOS±), a 5V internal LDO (INTVCC), EXTVCC switchover at 4.7V, and a RUN/SS pin combining soft-start ramping (1.2µA source) and timed short-circuit shutdown. The PGOOD pin monitors EAIN against ±7.5% of 0.8V reference and asserts low within 10µs on fault.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Dual-phase synchronous buck controller - enables 2× interleaved channels for reduced input/output ripple and scalable current up to 200A with daisy-chained controllers.
Input Voltage Range	4V to 36V - supports wide-range industrial and telecom input rails without external pre-regulation.
Output Voltage Accuracy	±1% over temperature - ensures tight regulation for CPU core and memory supply rails requiring stable voltage under dynamic load.
Switching Frequency	150kHz to 300kHz (phase-lockable) - balances efficiency (lower fSW) and transient response (higher effective 1.8MHz ripple frequency).
Duty Cycle Max	99% - enables ultra-low dropout operation down to VIN − VOUT ≈ 0.1V, critical for high-current, low-VOUT applications.
PGOOD Threshold	±7.5% of setpoint (VEAIN) - provides precise power-good signaling for system sequencing and fault isolation in multi-rail systems.
Remote Sensing	Differential amplifier with 0.995–1.005 gain and 46–55dB CMRR - rejects PCB trace IR drop for accurate regulation at point-of-load in high-current designs.

Pinout & Package

Package: 28-lead plastic SSOP (G package), 0.635mm pitch, body size 10.2mm × 5.3mm, JEDEC MS-012AC compliant. Thermal resistance θJA = 95°C/W.

Pin/Terminal	Circuit Role	Design Meaning
RUN/SS (1)	Soft-start & shutdown control	1.2µA internal current source charges external capacitor for controlled ramp-up; <0.8V forces full shutdown; >4.1V arms short-circuit latchoff.
SENSE1+/SENSE2+ (2,14)	Current sense positive inputs	Connect to high-side of external RSENSE; referenced to SGND; support ≤75mV full-scale threshold for precision current limiting.
SENSE1−/SENSE2− (3,13)	Current sense negative inputs	Connect to low-side of RSENSE; enable Kelvin sensing to reject PCB trace resistance errors in high-current paths.
EAIN (4)	Error amplifier inverting input	Receives feedback from VDIFFOUT via resistive divider; compared to 0.800V internal reference for closed-loop voltage regulation.
PGOOD (15)	Open-drain power-good output	Asserts low when VEAIN deviates >±7.5% from 0.8V; requires external pull-up to ≤7V; replaces AMPMD pin of non-PG variant.
TG1/TG2 (16,27)	Top-gate N-MOS drivers	Floating gate drivers with INTVCC-referenced swing; drive external high-side FETs; support bootstrap operation up to 42V BOOST-SW.
BG1/BG2 (19,23)	Bottom-gate N-MOS drivers	Ground-referenced drivers (0–5V swing); sink/source ≥5A peak; coordinate with TG for synchronous rectification.
VDIFFOUT (10)	Differential amplifier output	Provides true remote-sensed output voltage referenced to SGND; drives external feedback divider to EAIN for accurate load regulation.

Key Features

Feature	Design Value
PolyPhase™ dual-channel interleaving	Reduces RMS input/output capacitor ripple current by √2 vs single-phase, enabling smaller, lower-cost bulk capacitance and lower EMI.
OPTI-LOOP™ compensation	Allows stable loop response across wide range of output capacitance (10µF–10,000µF) and ESR (0.5mΩ–100mΩ) without external compensation redesign.
True remote differential sensing	Integrated differential amplifier (ADA = 0.995–1.005, CMRR = 46–55dB) eliminates IR drop error between regulator and load, critical for >20A applications.
Phase-lockable clock expansion	CLKOUT pin enables daisy-chaining up to 12 controllers for 15A–200A systems while maintaining even phasing and minimized total input ripple.
99% max duty cycle with dropout recovery	Enables operation with VIN as low as VOUT + 0.1V; internal dropout detector pulses top-FET off every 10th cycle to recharge bootstrap caps below 5V VIN.

Applications

Server VRM for Dual-Core CPUs	High-Density Memory Power Supply
Use Scenario: Delivering 1.6V/40A to modern x86 processors with fast load transients and strict voltage tolerance (±3%). IC Role / Device Role / Timing Role: Dual-phase controller managing interleaved high-side/low-side MOSFETs, generating synchronized 150–300kHz PWM with 180° phase shift. Use Value: Achieves <1% output voltage deviation during 20A/µs load steps and reduces input capacitor RMS current by 75% vs single-phase implementation.	Use Scenario: Powering DDR4/DDR5 DIMM modules requiring tightly regulated 1.2V or 1.1V rails with minimal board space. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller with remote sensing, driving discrete MOSFETs and supporting PolyPhase expansion for multi-rank memory banks. Use Value: Enables single-controller solution for 30A+ memory rails with <±10mV static error and <50mV dynamic droop, eliminating need for secondary point-of-load converters.
Industrial DC Power Distribution	Telecom Intermediate Bus Converter
Use Scenario: Converting 24V/48V intermediate bus to 3.3V/5V for FPGA, ASIC, and peripheral logic in ruggedized equipment. IC Role / Device Role / Timing Role: High-efficiency dual-phase controller operating from wide-input rail (4–36V), featuring micropower shutdown (<40µA) and robust UVLO (3.5V). Use Value: Delivers >92% peak efficiency at 20A/3.3V while maintaining thermal margin across –40°C to +85°C ambient, simplifying heatsink design.	Use Scenario: Stepping down –48V telecom rectified input to 12V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Dual-phase controller configured with external level-shifting circuitry to handle negative input; leverages phase-locking for noise-sensitive RF subsystem synchronization. Use Value: Reduces conducted EMI by spreading input current harmonics across two phases, meeting CISPR 22 Class B limits without oversized input filters.

Server VRM for Dual-Core CPUs

High-Density Memory Power Supply

Use Scenario: Delivering 1.6V/40A to modern x86 processors with fast load transients and strict voltage tolerance (±3%).

IC Role / Device Role / Timing Role: Dual-phase controller managing interleaved high-side/low-side MOSFETs, generating synchronized 150–300kHz PWM with 180° phase shift.

Use Value: Achieves <1% output voltage deviation during 20A/µs load steps and reduces input capacitor RMS current by 75% vs single-phase implementation.

Use Scenario: Powering DDR4/DDR5 DIMM modules requiring tightly regulated 1.2V or 1.1V rails with minimal board space.

IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller with remote sensing, driving discrete MOSFETs and supporting PolyPhase expansion for multi-rank memory banks.

Use Value: Enables single-controller solution for 30A+ memory rails with <±10mV static error and <50mV dynamic droop, eliminating need for secondary point-of-load converters.

Industrial DC Power Distribution

Telecom Intermediate Bus Converter

Use Scenario: Converting 24V/48V intermediate bus to 3.3V/5V for FPGA, ASIC, and peripheral logic in ruggedized equipment.

IC Role / Device Role / Timing Role: High-efficiency dual-phase controller operating from wide-input rail (4–36V), featuring micropower shutdown (<40µA) and robust UVLO (3.5V).

Use Value: Delivers >92% peak efficiency at 20A/3.3V while maintaining thermal margin across –40°C to +85°C ambient, simplifying heatsink design.

Use Scenario: Stepping down –48V telecom rectified input to 12V intermediate bus for downstream POL converters in base station equipment.

IC Role / Device Role / Timing Role: Dual-phase controller configured with external level-shifting circuitry to handle negative input; leverages phase-locking for noise-sensitive RF subsystem synchronization.

Use Value: Reduces conducted EMI by spreading input current harmonics across two phases, meeting CISPR 22 Class B limits without oversized input filters.

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
LTC3838EG#PBF	Single-phase, 4V–36V input, no PGOOD, no differential amplifier, uses current-mode + voltage-mode hybrid control.	Lacks remote sensing and dual-phase interleaving; suitable only for ≤25A single-rail applications where cost and simplicity outweigh ripple reduction needs.	Select LTC3838EG#PBF only if phase count, PGOOD, or remote sensing are not required and board space is constrained.
MP8765GL-Z	Monolithic dual-phase controller (integrated MOSFETs), 4.5V–16V input, no EXTVCC switchover, no CLKOUT expansion, PGOOD with ±5% threshold.	Lower voltage range and integrated FETs limit use to consumer-grade 12V-input systems; lacks scalability beyond 40A and remote sensing capability.	Choose MP8765GL-Z for compact, cost-sensitive 12V-input applications where 40A max and ±5% PGOOD tolerance are acceptable.

Compared with LTC3838EG#PBF and MP8765GL-Z, the LTC1629IG-PG#PBF uniquely combines dual-phase interleaving, true remote differential sensing, 4–36V wide input, 99% duty cycle, and scalable CLKOUT expansion-making it the only option among the three qualified for high-current, high-accuracy server and industrial VRMs requiring long-term reliability and design flexibility.

Availability

LTC1629IG-PG#PBF is available at Aetrix Electronics and suitable for server VRMs, high-density memory power supplies, and industrial DC distribution systems requiring stable component supply, long lifecycle support, and guaranteed traceability.

Supply support for LTC1629IG-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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, power, and signal integrity applications.

The LTC1629IG-PG#PBF belongs to ADI's legacy Linear Technology Power Management product line, engineered specifically for high-efficiency, multi-phase DC/DC conversion in computing, networking, and industrial infrastructure where accuracy, thermal performance, and scalability are critical.

FAQ

What is the function of the PGOOD pin on the LTC1629IG-PG#PBF?

The PGOOD pin on the LTC1629IG-PG#PBF is an open-drain logic output that asserts low when the regulated output voltage deviates more than ±7.5% from its nominal value, as determined by the EAIN feedback voltage relative to the internal 0.800V reference. It responds within 10µs of fault detection and requires an external pull-up resistor to a supply ≤7V. This pin replaces the AMPMD pin found on the non-PG variant and enables reliable power sequencing in multi-rail systems using the LTC1629IG-PG#PBF.

How does the LTC1629IG-PG#PBF achieve true remote voltage sensing?

The LTC1629IG-PG#PBF achieves true remote voltage sensing through an integrated differential amplifier with dedicated VOS+ and VOS− inputs and a VDIFFOUT output. This amplifier measures the voltage difference between the positive and negative output terminals of the power stage and references it to SGND, rejecting PCB trace resistance and contact losses. Its gain is tightly controlled (0.995–1.005) and common-mode rejection is 46–55dB, ensuring accurate regulation at the load-even for 40A applications-when the LTC1629IG-PG#PBF is used with proper Kelvin connections.

Can the LTC1629IG-PG#PBF operate in dropout mode, and how is it handled?

Yes, the LTC1629IG-PG#PBF supports very low dropout operation with up to 99% duty cycle. When VIN approaches VOUT, the controller enters dropout and internally disables continuous top-FET conduction to prevent bootstrap capacitor depletion. Instead, it forces the top FET off for ~400ns every 10th switching cycle to recharge the bootstrap capacitor, maintaining gate drive integrity without external circuitry. This behavior is automatic and transparent, allowing the LTC1629IG-PG#PBF to sustain regulation down to VIN − VOUT ≈ 0.1V while preserving efficiency and reliability.

What is the purpose of the CLKOUT pin on the LTC1629IG-PG#PBF?

The CLKOUT pin on the LTC1629IG-PG#PBF provides a phase-aligned clock signal derived from the internal master oscillator (12× channel frequency) and is used to synchronize additional LTC1629IG-PG#PBF or compatible controllers in multi-phase systems. By daisy-chaining CLKOUT to PLLIN of subsequent controllers, designers can scale output current from 40A to 200A across up to 12 evenly phased stages while minimizing input capacitor RMS current and system-level EMI-key capabilities enabled exclusively by the LTC1629IG-PG#PBF's PolyPhase architecture.

How does OPTI-LOOP™ compensation benefit designs using the LTC1629IG-PG#PBF?

OPTI-LOOP™ compensation in the LTC1629IG-PG#PBF allows stable closed-loop operation across a wide range of output capacitor values (10µF to 10,000µF) and ESR (0.5mΩ to 100mΩ) without requiring manual compensation network changes. This eliminates iterative loop tuning during prototyping and enables flexible BOM optimization-such as substituting low-ESR polymer caps for tantalum or ceramic arrays-while guaranteeing phase margin and transient response. As a result, the LTC1629IG-PG#PBF maintains robust performance across diverse load conditions and capacitor aging effects.

LTC1629IG-PG#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: PolyPhase®

Package/Case:: 28-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):: 4V ~ 36V

Frequency - Switching:: 220kHz

Duty Cycle (Max):: 99.5%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Phase Control, Power Good, Soft Start

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

LTC1629IG-PG#PBF FAQ

1.How can I place an order for LTC1629IG-PG#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC1629IG-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 LTC1629IG-PG#PBF reliable?

The price and inventory of LTC1629IG-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 LTC1629IG-PG#PBF is usually 5 days.

3.What payment methods are accepted for LTC1629IG-PG#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1629IG-PG#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC1629IG-PG#PBF?

LTC1629IG-PG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC1629IG-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 LTC1629IG-PG#PBF?

For technical support, including LTC1629IG-PG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1629IG-PG#PBF requirements.

6.How does Aetrix verify that LTC1629IG-PG#PBF is sourced from the original manufacturer or authorized distributors?

All LTC1629IG-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 LTC1629IG-PG#PBF meets industry standards.

7.What is the process for return or replacement of LTC1629IG-PG#PBF?

All LTC1629IG-PG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1629IG-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 LTC1629IG-PG#PBF part is unused and in its original packaging.

Return procedure for LTC1629IG-PG#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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