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Analog Devices Inc. LTC3736EGN#PBF
- Part No.:
- LTC3736EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3736EGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,553
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Product details
Overview
LTC3736EGN#PBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller driving external complementary MOSFETs for high-efficiency DC/DC conversion. It features no-RSENSE current sensing via VDS monitoring, 0.6V ±1.5% reference, 2.75V–9.8V input range, and output voltage tracking-enabling coordinated start-up of dual rails in battery-powered portable computing systems.
For engineers reviewing the LTC3736EGN#PBF datasheet, LTC3736EGN#PBF pinout, LTC3736EGN#PBF application, or LTC3736EGN#PBF equivalent, key selection considerations include its 2-phase interleaved architecture reducing input RMS current, selectable Burst Mode®/forced continuous operation, true PLL synchronization (250–850 kHz), auxiliary winding regulation capability, and 24-lead narrow SSOP package with exposed PGND pad.
Technical Context
The LTC3736EGN#PBF implements two independent constant-frequency current-mode controllers operating 180° out of phase to minimize input capacitor stress and EMI. Each channel uses MOSFET VDS sensing instead of discrete sense resistors, with peak current threshold set by ITH voltage and programmable via IPRG pins (70–223 mV range).
Its PLL architecture enables precise frequency locking to external clocks; the SYNC/FCB pin serves triple duty as auxiliary feedback input, synchronization interface, and Burst Mode/continuous mode selector. Tracking functionality allows VOUT2 to follow VOUT1 during start-up using an external resistor divider on VOUT1 connected to the TRACK pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 9.8V - supports single/dual Li-ion battery inputs and wide industrial supply rails. |
| Reference Voltage | 0.6V ±1.5% over –40°C to 85°C - ensures tight output regulation across temperature. |
| Switching Frequency | 300kHz / 550kHz / 750kHz (pin-selectable) or 250–850kHz (PLL-synchronized) - balances efficiency vs. component size. |
| Current Sense Method | No external RSENSE required - uses VDS of external P-MOSFET for lossless sensing and higher efficiency. |
| Shutdown IQ | 9µA - extends battery life in always-on portable systems during deep sleep. |
| Output Tracking | True analog tracking via TRACK pin - enables controlled, ratio-matched ramp-up of secondary output (e.g., VDDQ following VDD). |
| Protection Features | Output overvoltage (±13.3% trip), short-circuit foldback (1/5 frequency), reverse-current prevention - enhances system reliability without external circuitry. |
Pinout & Package
The LTC3736EGN#PBF is housed in a 24-lead narrow-body SSOP package (GN) with exposed thermal pad connected to PGND. Pin pitch is 0.65mm; body dimensions are 7.5mm × 4.4mm. The exposed pad (Pin 25 not present in GN; PGND pins are 15, 19, 23) must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Switch Node Input | Connects to drain of P-MOSFET, source of N-MOSFET, and inductor - serves as negative current sense input and reverse-current detection point. |
| SENSE1+ / SENSE2+ | Current Sense Positive Input | Connects to source of P-MOSFET - provides VDS-based current sensing and powers gate drivers. |
| TG1 / TG2 | Top Gate Drive Output | Drives gate of external P-channel MOSFETs with rail-to-rail swing (PGND to SENSE+). |
| BG1 / BG2 | Bottom Gate Drive Output | Drives gate of external N-channel MOSFETs - active during freewheeling; prevents reverse current. |
| VFB1 / VFB2 | Feedback Input | Monitors output voltage via resistor divider - compared to 0.6V reference to regulate each channel independently. |
| TRACK | Tracking Reference Input | Accepts scaled VOUT1 to force VOUT2 to track during start-up - eliminates sequencing ICs in dual-rail systems. |
| RUN/SS | Enable & Soft-Start Control | Pull low to shut down (9µA IQ); release for internal soft-start (1ms ramp) or add external capacitor for adjustable timing. |
| SYNC/FCB | Multi-function Pin | Enables PLL sync (250–850kHz), selects Burst Mode (VIN) or forced continuous (GND), or accepts auxiliary winding feedback. |
| IPRG1 / IPRG2 | Peak Sense Threshold Select | Three-state inputs (float/VIN/GND) set max ΔVSENSE per channel: 125mV / 204mV / 85mV - optimizes current limit vs. duty cycle. |
| PGOOD | Power Good Monitor | Open-drain output pulled low if either VFB deviates >±13.3% from 0.6V - signals valid power to downstream logic or PMIC. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Interleaving | Reduces input capacitor RMS current by ~50% versus single-phase dual controllers - enables smaller, lower-cost input filtering. |
| No-RSENSE Architecture | Eliminates power loss and board space associated with external current sense resistors - improves full-load efficiency and thermal performance. |
| True Analog Tracking | Allows VOUT2 to precisely follow VOUT1 during power-up without digital sequencing - simplifies design of DDR memory or multi-core SoC supplies. |
| Programmable Light-Load Mode | Select Burst Mode® (high efficiency, discontinuous), forced continuous (low ripple), or pulse-skipping (sync'd, balanced trade-off) - adapts to dynamic load profiles. |
| Integrated Protection Suite | Includes overvoltage lockout (0.68V at VFB), short-circuit foldback, reverse-current prevention, and undervoltage lockout (2.25V UVLO) - reduces BOM count and failure modes. |
Applications
| DDR Memory Power Supply | Multi-Core SoC Core Voltage |
|---|---|
|
Use Scenario: Dual-rail power delivery for DDR3/DDR4 memory subsystems requiring tightly coupled VDD and VDDQ rails with synchronized start-up and shutdown. IC Role / Device Role / Timing Role: LTC3736EGN#PBF acts as dual 2-phase controller managing independent 1.2V/1.35V outputs with tracking, enabling compliant JEDEC power sequencing. Use Value: Eliminates need for external tracking ICs or complex FPGA-based sequencing - reduces solution size and improves reliability under transient load steps. |
Use Scenario: High-current core voltage regulation for ARM or x86 application processors with dynamic voltage/frequency scaling (DVFS). IC Role / Device Role / Timing Role: LTC3736EGN#PBF delivers up to 2× 2-phase phases per rail, supporting >10A total with low output impedance and fast transient response. Use Value: 2-phase interleaving minimizes output voltage ripple and input capacitor stress - critical for noise-sensitive CPU cores and high-speed interfaces. |
| Portable Medical Instrumentation | Distributed Telecom Power |
|
Use Scenario: Battery-powered handheld diagnostics devices requiring long runtime, low-noise power, and robust fault handling. IC Role / Device Role / Timing Role: LTC3736EGN#PBF regulates dual rails (e.g., 3.3V analog + 1.8V digital) from 2-cell Li-ion, using Burst Mode® to extend battery life. Use Value: 9µA shutdown current and 100% duty-cycle dropout operation maximize usable battery capacity - especially critical in life-critical field equipment. |
Use Scenario: Intermediate bus conversion in distributed power architectures where multiple point-of-load regulators draw from a common 5V/12V rail. IC Role / Device Role / Timing Role: LTC3736EGN#PBF serves as pre-regulator generating stable 3.3V/2.5V intermediate rails with high efficiency and low EMI. Use Value: PLL synchronization allows all converters in the system to operate at harmonically aligned frequencies - suppressing beat frequencies and easing EMI compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855EUF#PBF | Single-output, 2-phase controller with integrated MOSFET drivers; no tracking or auxiliary winding support; 4mm × 4mm QFN only. | Suitable for single-rail high-current apps (e.g., GPU core); lacks dual independent outputs and tracking needed for DDR or SoC sequencing. | Choose LTC3736EGN#PBF when dual independent regulated outputs with tracking are required; LTC3855 suits single-rail, space-constrained designs. |
| MP2953GQ-Z | Monolithic dual 2-phase controller (integrated FETs); fixed 0.6V ref; no PLL sync; max VIN = 24V; no TRACK pin. | Targets mid-power industrial DC/DC (e.g., 12V→3.3V/1.2V); lacks battery-optimized features like 2.75V VIN min or 9µA shutdown IQ. | LTC3736EGN#PBF is preferred for Li-ion portable systems needing ultra-low IQ, wide VIN, and analog tracking; MP2953 fits cost-sensitive, fixed-input industrial use. |
Compared with LTC3855EUF#PBF and MP2953GQ-Z, the LTC3736EGN#PBF uniquely combines dual independent 2-phase control, analog tracking, true PLL synchronization, and sub-10µA shutdown - making it the only option qualified for precision dual-rail sequencing in battery-powered computing.
Availability
LTC3736EGN#PBF is available at Aetrix Electronics and suitable for notebook computers, portable medical instruments, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3736EGN#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 leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LTC3736EGN#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding portable, computing, and industrial applications requiring precision regulation, low quiescent current, and advanced protection.
FAQ
What is the package type and thermal pad configuration for LTC3736EGN#PBF?
The LTC3736EGN#PBF uses a 24-lead narrow-body SSOP (GN) package measuring 7.5mm × 4.4mm with 0.65mm pitch. It has three dedicated PGND pins (15, 19, 23) and requires the exposed thermal pad on the underside to be soldered directly to a PCB ground plane for optimal thermal dissipation and electrical performance. Unlike the QFN variant (LTC3736EUF), the GN package does not include Pin 25 - PGND is fully routed through the listed pins and board-level copper.
How does the TRACK pin function in LTC3736EGN#PBF, and what resistor values are needed for 1:1 tracking?
The TRACK pin on LTC3736EGN#PBF enables analog voltage tracking so VOUT2 follows VOUT1 during start-up. For 1:1 tracking, connect a resistor divider from VOUT1 to TRACK that matches the divider used from VOUT2 to VFB2 - e.g., if VOUT2 uses 15kΩ/59kΩ to set 1.8V, then apply the same ratio from VOUT1 to TRACK. This ensures identical ramp rates and avoids sequencing violations in DDR or multi-core SoC applications.
Can LTC3736EGN#PBF operate with only one output enabled while the other is disabled?
Yes, LTC3736EGN#PBF supports independent channel enable/disable. Pulling RUN/SS low disables both channels, but individual channel operation is controlled via feedback loop stability and external component selection. To disable Channel 2, omit its feedback divider and leave VFB2 open or tie it to SGND - however, best practice is to use the TRACK pin with VOUT1 only, or configure Channel 2 in forced continuous mode with no load. Full channel disable requires external MOSFET gate control.
What is the minimum input voltage required for LTC3736EGN#PBF to exit undervoltage lockout?
The LTC3736EGN#PBF exits undervoltage lockout when VIN rises above 2.45V (typical) - specified as 2.15V to 2.75V over temperature. Hysteresis ensures clean turn-on; the device remains disabled below this threshold to prevent erratic switching or insufficient gate drive to external MOSFETs. This 2.45V UVLO threshold makes LTC3736EGN#PBF compatible with 2-cell Li-ion batteries down to ~2.5V/cell under load.
Does LTC3736EGN#PBF support synchronization to an external clock, and what is the guaranteed lock range?
Yes, LTC3736EGN#PBF supports true PLL-based synchronization via the SYNC/FCB pin. Its guaranteed lock range is 250kHz to 850kHz over temperature - meaning it will reliably align its internal oscillator phase to any CMOS-compatible external clock within that band. A series RC network between PLLLPF and SGND serves as the loop filter; typical values are 10kΩ and 1nF for stable lock under varying load conditions.
LTC3736EGN#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):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 300kHz ~ 750kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3736EGN#PBF FAQ
1.How can I place an order for LTC3736EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3736EGN#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 LTC3736EGN#PBF reliable?
The price and inventory of LTC3736EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3736EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3736EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3736EGN#PBF?
LTC3736EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3736EGN#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 LTC3736EGN#PBF?
For technical support, including LTC3736EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EGN#PBF requirements.
6.How does Aetrix verify that LTC3736EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3736EGN#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 LTC3736EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3736EGN#PBF?
All LTC3736EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EGN#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 LTC3736EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3736EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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