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

Analog Devices Inc. LTC1735IGN-1#TRPBF

Name: LTC1735IGN-1#TRPBF
Brand: Analog Devices Inc.
SKU: LTC1735IGN-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC1735IGN-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC1735IGN-1#TRPBF.pdf

Description:: IC REG CTRLR BUCK 16SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LTC1735IGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller optimized for CPU core power delivery in mobile computing platforms. It delivers 0.8V to 7V output with ±1% accuracy, supports 3.5V–30V input, operates up to 500kHz, and features OPTI-LOOP™ compensation for transient optimization across wide output capacitance/ESR ranges - used in SpeedStep-enabled Pentium III notebook DC/DC converters.

For engineers reviewing the LTC1735IGN-1#TRPBF datasheet, LTC1735IGN-1#TRPBF pinout, LTC1735IGN-1#TRPBF application, or LTC1735IGN-1#TRPBF equivalent, key selection criteria include programmable current limit via R_SENSE, 99% dropout duty cycle, PGOOD window comparator (±7.5%), Burst Mode™ efficiency at light load, and dual N-MOSFET gate drive capability.

Technical Context

The LTC1735IGN-1#TRPBF implements a constant-frequency, current-mode control architecture with an internal transconductance error amplifier (g_m = 1.3 mmho) and dual current comparators for peak-current sensing and foldback protection. Its OPTI-LOOP™ compensation allows loop stability tuning independent of output capacitor ESR, enabling robust transient response with ceramic or polymer capacitors.

It integrates synchronized dual N-channel MOSFET drivers (TG/BG), a 5.2V INTVCC LDO with EXTVCC switchover (4.7V threshold), and a window-based PGOOD monitor tied to VOSENSE with ±7.5% trip hysteresis. Burst Mode™ operation is pin-defeatable via PGOOD, and synchronization is supported through external clock injection on the PGOOD pin (0.9f_O to 1.3f_O range).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	0.8V to 7V - set by external resistive divider on VOSENSE; enables dynamic voltage scaling for CPU cores.
Input Voltage Range	3.5V to 30V (36V abs max) - supports wide-input battery and adapter rails in notebooks and PDAs.
Output Accuracy	±1% over temperature - ensures stable CPU V_DD compliance with Intel Mobile CPU specifications.
PGOOD Window	±7.5% of programmed V_OUT - meets Intel-defined power-good timing and sequencing requirements.
Max Duty Cycle	99.4% - enables ultra-low dropout operation during deep input voltage sag (e.g., battery discharge).
Switching Frequency	Up to 500kHz (synchronizable) - balances MOSFET switching loss vs. inductor/capacitor size in space-constrained layouts.
I_Q (Shutdown)	<25µA - enables micropower state retention during system sleep without compromising wake-up latency.

Pinout & Package

Package: 16-lead narrow SSOP (GN), 5.3mm × 6.2mm body, 0.635mm pitch, exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
COSC	Oscillator timing capacitor node	External capacitor sets operating frequency; enables precise frequency tuning and synchronization.
RUN/SS	Soft-start ramp & shutdown control	Capacitor sets soft-start time (~1.25s/µF); <1.5V forces shutdown; latchoff triggered on sustained overcurrent.
ITH	Error amplifier output / current limit control	Voltage (0–2.4V) sets peak inductor current threshold; enables programmable current limiting via R_SENSE.
PGOOD	Open-drain status & sync input	Pulled low when VOSENSE outside ±7.5%; externally clocked to synchronize oscillator or force continuous mode.
SENSE– / SENSE+	Differential current sense inputs	Measure voltage across R_SENSE; built-in offset enables accurate current monitoring independent of common-mode voltage.
VOSENSE	Feedback voltage input	Receives scaled output voltage; referenced to 0.8V internal bandgap for precision regulation.
TG / BG	Top/bottom N-MOSFET gate drivers	High-current (3A peak), fast-transition (50–90ns) drivers optimized for synchronous rectification efficiency.
BOOST / SW / VIN / INTVCC / EXTVCC / PGND / SGND	Power routing & grounding	Separate power (PGND) and signal (SGND) grounds prevent noise coupling; EXTVCC switchover improves efficiency at high load.

Key Features

Feature	Design Value
OPTI-LOOP™ Compensation	Decouples loop stability from output capacitor ESR - enables use of low-ESR ceramic capacitors without phase-margin risk.
Pin-Defeatable Burst Mode™	Enables >90% efficiency at 1mA load; disabled via PGOOD tie-low to guarantee fixed-frequency operation for noise-sensitive applications.
Programmable Current Limit	Set via external R_SENSE (e.g., 0.004Ω → ~12A max); foldback reduces short-circuit current to ~25% of limit for thermal safety.
99% Dropout Duty Cycle	Maintains regulation down to VIN – VOUT ≈ 100mV - critical for battery-powered systems with collapsing input rails.
Power Good Window Comparator	±7.5% tolerance matches Intel Mobile CPU spec; open-drain output simplifies sequencing with FPGA/CPU reset logic.

Applications

Mobile CPU Core Power	Notebook System Rails
Use Scenario: Dynamic voltage scaling for Pentium III processors with SpeedStep™ technology in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary CPU core regulator controlling V_DD in real time based on performance state transitions. Use Value: Enables >30% reduction in CPU active power via adaptive 1.35V/1.60V V_DD switching while maintaining ±1% regulation and ±7.5% PGOOD timing.	Use Scenario: Secondary 3.3V/5V system rail generation from main battery or adapter in clamshell notebooks. IC Role / Device Role / Timing Role: High-efficiency buck controller driving discrete N-MOSFETs for non-core system power domains. Use Value: Delivers >92% efficiency at 5A load with 15V input, reducing thermal load on compact PCBs and extending battery runtime.
Wireless Modem Power	PDA Application Processor Supply
Use Scenario: Powering 3G/4G baseband modems requiring fast load-step response and low-noise operation. IC Role / Device Role / Timing Role: Synchronous buck controller with Burst Mode™ disabled (via PGOOD tie-low) for constant-frequency, low-EMI operation. Use Value: Achieves <15mVpp output ripple under 10A load step (10µs rise) - prevents RF front-end desensitization in cellular bands.	Use Scenario: Regulating 1.2V core supply for ARM-based application processors in handheld PDAs. IC Role / Device Role / Timing Role: Low-quiescent-current (25µA shutdown) controller supporting deep-sleep modes with fast wake-up. Use Value: Reduces system standby power by >40% versus legacy controllers, enabling multi-day PDA battery life with frequent wake cycles.

Mobile CPU Core Power

Notebook System Rails

Use Scenario: Dynamic voltage scaling for Pentium III processors with SpeedStep™ technology in ultraportable notebooks.

IC Role / Device Role / Timing Role: Primary CPU core regulator controlling V_DD in real time based on performance state transitions.

Use Value: Enables >30% reduction in CPU active power via adaptive 1.35V/1.60V V_DD switching while maintaining ±1% regulation and ±7.5% PGOOD timing.

Use Scenario: Secondary 3.3V/5V system rail generation from main battery or adapter in clamshell notebooks.

IC Role / Device Role / Timing Role: High-efficiency buck controller driving discrete N-MOSFETs for non-core system power domains.

Use Value: Delivers >92% efficiency at 5A load with 15V input, reducing thermal load on compact PCBs and extending battery runtime.

Wireless Modem Power

PDA Application Processor Supply

Use Scenario: Powering 3G/4G baseband modems requiring fast load-step response and low-noise operation.

IC Role / Device Role / Timing Role: Synchronous buck controller with Burst Mode™ disabled (via PGOOD tie-low) for constant-frequency, low-EMI operation.

Use Value: Achieves <15mVpp output ripple under 10A load step (10µs rise) - prevents RF front-end desensitization in cellular bands.

Use Scenario: Regulating 1.2V core supply for ARM-based application processors in handheld PDAs.

IC Role / Device Role / Timing Role: Low-quiescent-current (25µA shutdown) controller supporting deep-sleep modes with fast wake-up.

Use Value: Reduces system standby power by >40% versus legacy controllers, enabling multi-day PDA battery life with frequent wake cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS54620RGYR	Integrated FETs (3A), fixed 600kHz f_SW, no EXTVCC switchover, lower I_Q (19µA)	Targeted at medium-current, space-constrained designs where board area > efficiency priority	Choose for simplified layout and reduced BOM count when output current ≤3A and EXTVCC efficiency gain is non-critical.
ISL6263CRZ-T	Multi-phase capable, supports VR12.5/IMVP-6, integrated MOSFET drivers only (no power stage), 0.5% V_OUT accuracy	Designed for advanced CPU VRMs with digital IMON and VID interface - not pin-compatible	Choose for next-gen mobile CPUs requiring digital interface and tighter voltage margins; requires redesign of feedback and sequencing circuitry.

Compared with TPS54620RGYR and ISL6263CRZ-T, the LTC1735IGN-1#TRPBF offers superior flexibility in high-current discrete-FET designs, wider input range (3.5–30V), and EXTVCC efficiency optimization - making it optimal for legacy SpeedStep™ platforms where layout reuse and thermal headroom are critical.

Availability

LTC1735IGN-1#TRPBF is available at Aetrix Electronics and suitable for notebook CPU core power, wireless modem DC/DC conversion, and PDA application processor supply requiring stable component supply and long-term industrial availability.

Supply support for LTC1735IGN-1#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 support for its high-performance power management portfolio.

The LTC1735IGN-1#TRPBF belongs to Linear's CPU-optimized synchronous buck controller family, designed specifically for Intel Mobile CPU power delivery with SpeedStep™ compatibility, dynamic voltage scaling, and tight PGOOD timing.

FAQ

What is the maximum input voltage rating for the LTC1735IGN-1#TRPBF?

The LTC1735IGN-1#TRPBF has an absolute maximum input voltage (VIN) rating of 36V, with recommended continuous operation from 3.5V to 30V. Exceeding 36V risks permanent damage to internal circuitry, including the INTVCC regulator and gate drivers. The device includes undervoltage lockout (UVLO) that disables operation below 3.5V to prevent erratic startup behavior.

How does the PGOOD pin function in the LTC1735IGN-1#TRPBF?

The PGOOD pin on the LTC1735IGN-1#TRPBF serves three roles: (1) open-drain power-good indicator pulled low when VOSENSE deviates >±7.5% from 0.8V reference; (2) forced continuous-mode enable when tied to ground; (3) synchronization input when driven with a 0.9–1.3× f_O external clock. It must be pulled up externally for status indication and never directly connected to INTVCC or other voltage sources.

Can the LTC1735IGN-1#TRPBF operate in dropout mode, and what is its minimum dropout voltage?

Yes, the LTC1735IGN-1#TRPBF supports dropout operation with up to 99.4% duty cycle. At 12A load and 1.6V output, measured VIN–VOUT dropout is <100mV - achieved by forcing top-FET conduction and using a dropout counter to periodically refresh the BOOST capacitor. This enables stable regulation even as input voltage collapses near battery end-of-life.

What is the purpose of the EXTVCC pin on the LTC1735IGN-1#TRPBF?

The EXTVCC pin on the LTC1735IGN-1#TRPBF allows external supply of the INTVCC rail (5.2V) to improve efficiency. When EXTVCC exceeds 4.7V, an internal switch disconnects the VIN-fed LDO and connects EXTVCC directly to INTVCC - eliminating LDO dropout loss. This is commonly used by feeding EXTVCC from a secondary converter output, reducing total system power dissipation by up to 15% at high load.

How is current limit programmed on the LTC1735IGN-1#TRPBF?

Current limit on the LTC1735IGN-1#TRPBF is programmed via external sense resistor R_SENSE between SENSE+ and SENSE– pins. The peak inductor current threshold is 75mV/R_SENSE (typical). For example, a 0.004Ω resistor sets ~18.75A peak limit. Foldback reduces this to ~25% under short-circuit conditions. The ITH pin voltage (0–2.4V) provides real-time current limit modulation during transient events.

LTC1735IGN-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 16-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:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 3.5V ~ 30V

Frequency - Switching:: 300kHz

Duty Cycle (Max):: 99.4%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Power Good, Soft Start

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SSOP

LTC1735IGN-1#TRPBF FAQ

1.How can I place an order for LTC1735IGN-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC1735IGN-1#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 LTC1735IGN-1#TRPBF reliable?

The price and inventory of LTC1735IGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1735IGN-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC1735IGN-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1735IGN-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC1735IGN-1#TRPBF?

LTC1735IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC1735IGN-1#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 LTC1735IGN-1#TRPBF?

For technical support, including LTC1735IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1735IGN-1#TRPBF requirements.

6.How does Aetrix verify that LTC1735IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC1735IGN-1#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 LTC1735IGN-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC1735IGN-1#TRPBF?

All LTC1735IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1735IGN-1#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 LTC1735IGN-1#TRPBF part is unused and in its original packaging.

Return procedure for LTC1735IGN-1#TRPBF:

1.Submit a request within 90 days.

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

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