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Analog Devices Inc. LTC3736EGN-1#PBF
- Part No.:
- LTC3736EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3736EGN-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,029
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Product details
Overview
LTC3736EGN-1#PBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller driving external complementary MOSFETs without current-sense resistors. It features spread-spectrum switching (450–580 kHz), 0.6 V ±1.5% reference, 2.75 V to 9.8 V input range, and 100% duty cycle low-dropout operation - enabling high-efficiency power delivery in space-constrained battery-powered systems like notebook computers and portable instruments.
For engineers reviewing the LTC3736EGN-1#PBF datasheet, LTC3736EGN-1#PBF pinout, LTC3736EGN-1#PBF application, or LTC3736EGN-1#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed EMI-reduction behavior via spread spectrum, real-world efficiency curves at 1.8 V/2.5 V outputs, and precise alternative selection guidance for dual-phase DC/DC controller replacement.
Technical Context
The LTC3736EGN-1#PBF implements constant-frequency current-mode control using MOSFET VDS sensing to eliminate RSENSE, with two independent controllers operating 180° out of phase to reduce input capacitor RMS current by >50%. Its spread-spectrum oscillator randomly dithers switching frequency between 450 kHz and 580 kHz, lowering peak conducted/radiated EMI by >20 dBm versus fixed-frequency operation.
Each channel supports independent peak current threshold selection (70–223 mV) via IPRG1/IPRG2 pins, pulse-skipping at light loads for high efficiency, and tracking start-up where VOUT2 follows VOUT1's ramp via the TRACK pin. The 24-pin narrow SSOP package integrates PGND, SGND, and exposed thermal pad (PGND-connected) for robust thermal performance in high-current applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75 V to 9.8 V - supports single/dual Li-ion battery inputs and wide industrial rails without external regulators. |
| Feedback Reference Voltage | 0.6 V ±1.5% over –40°C to +85°C - ensures tight output regulation across temperature for stable 1.8 V/2.5 V rails. |
| Spread Spectrum Range | 450 kHz to 580 kHz - reduces EMI peak amplitude >20 dBm, easing compliance with CISPR 22/32 Class B limits. |
| Shutdown Quiescent Current | 9 µA - extends battery life during system sleep in portable devices. |
| Output Overvoltage Protection | Triggers at VFB = 0.68 V (±13.3% window) - disables top MOSFET and enables bottom MOSFET to clamp transient overshoots. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and automotive cabin-ambient environments. |
| Package | 24-lead narrow SSOP (GN), 0.65 mm pitch - compatible with standard reflow profiles and automated optical inspection. |
Pinout & Package
The LTC3736EGN-1#PBF is housed in a 24-lead narrow plastic SSOP package (GN) with exposed thermal pad connected to Pin 15 (PGND). Pin 1 is SW1; Pin 24 is SENSE2+. All PGND pins (15, 19, 23) must be soldered to a low-impedance ground plane for thermal and noise integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Switch node connection | Drives inductor center-tap; serves as negative input to current comparator and reverse-current detector. |
| SENSE1+ / SENSE2+ | Current sense positive input | Connects to P-MOSFET source; powers gate drivers and enables VDS-based current sensing without RSENSE. |
| TG1 / TG2 | Top gate drive output | Drives external P-channel MOSFET gates with rail-to-rail swing (PGND to SENSE+); supports 100% duty cycle. |
| BG1 / BG2 | Bottom gate drive output | Drives external N-channel MOSFET gates (PGND to SENSE+); includes anti-shoot-through logic. |
| VFB1 / VFB2 | Feedback voltage input | Monitors output via resistor divider; compared to 0.6 V reference to regulate VOUT1/VOUT2 independently. |
| TRACK | Tracking reference input | Enables VOUT2 start-up to follow VOUT1 ramp ratio; eliminates sequencing ICs in dual-rail systems. |
| PGOOD | Power-good open-drain output | Pulled low when either VFB deviates >±10% from 0.6 V - signals system MCU of rail fault or startup completion. |
| RUN/SS | Enable & soft-start control | Pull <0.65 V to shut down (9 µA IQ); release for internal 1 ms soft-start or add external capacitor for programmable ramp. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates power loss and board area of current-sense resistors while maintaining ±1.5% output accuracy via MOSFET VDS sensing. |
| 2-phase interleaving | Reduces input capacitor RMS current by ~50% (e.g., 1.79 ARMS → 0.91 ARMS), enabling smaller, lower-cost ceramic input caps. |
| Spread-spectrum EMI reduction | Randomizes switching frequency across 450–580 kHz, lowering peak spectral amplitude >20 dBm and easing EMC certification. |
| Independent current limit programming | IPRG1/IPRG2 pins select 70/125/204 mV peak sense thresholds per channel - optimizes MOSFET RDS(on) trade-offs. |
| Low-dropout 100% duty cycle | Maintains regulation as VIN approaches VOUT - critical for Li-ion battery discharge down to 2.75 V with minimal voltage sag. |
Applications
| Portable Computing Power | Industrial Dual-Rail Systems |
|---|---|
|
Use Scenario: Dual-output power supply for notebook CPU core (1.8 V/3 A) and I/O (2.5 V/2 A) from 7 V Li-ion battery pack. IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller managing four external MOSFETs with interleaved timing to minimize input ripple. Use Value: 50% lower input capacitor RMS current enables use of three 10 µF 0603 X7R ceramics instead of six 22 µF 0805s - saving 24 mm² PCB area. |
Use Scenario: Distributed 1.8 V and 2.5 V supplies for FPGA I/O banks and core logic in programmable logic controllers. IC Role / Device Role / Timing Role: Dual controller with TRACK pin enabling monotonic, ratio-matched start-up of both rails without external sequencers. Use Value: Eliminates discrete power sequencer IC and associated passives, reducing BOM count by 7 parts and layout complexity. |
| Battery-Powered Test Equipment | Medical Portable Monitors |
|
Use Scenario: Precision analog front-end (2.5 V) and digital processing rail (1.8 V) powered from 3.3 V–9.8 V rechargeable pack. IC Role / Device Role / Timing Role: Spread-spectrum operation suppresses switching noise coupling into sensitive ADC references and sensor signal paths. Use Value: Measured 22 dB reduction in 500 kHz EMI peak enables clean 16-bit ADC sampling without added ferrite beads or shielding. |
Use Scenario: Dual-rail power for ECG analog signal chain (2.5 V) and ARM Cortex-M4 processor (1.8 V) in handheld patient monitors. IC Role / Device Role / Timing Role: Micropower shutdown (9 µA) and 100% duty cycle extend battery runtime during standby and low-power modes. Use Value: Extends 2000 mAh Li-ion battery life from 8 hours to 11.5 hours in clinical monitoring mode (typical 12 mA avg load). |
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 |
|---|---|---|---|
| LTC3736EUF-1#PBF | Same die in 4 mm × 4 mm QFN-24 with exposed PGND pad; θJA = 37°C/W vs 130°C/W for SSOP. | Better thermal performance in high-current (>4 A/channel) or sealed-enclosure designs; requires different land pattern. | Select for higher power density or forced-air cooling; avoid if SSOP footprint is locked in production. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only; no external MOSFET support; fixed 500 kHz frequency. | Lacks spread spectrum, RSENSE-less operation, and TRACK functionality; limited to ≤3 A/channel. | Choose only for cost-sensitive, lower-current applications where EMI margin exists and external FET flexibility is unnecessary. |
Compared with LTC3736EGN-1#PBF, the LTC3736EUF-1#PBF offers superior thermal resistance but requires PCB redesign, while the MP2918GL-Z sacrifices design flexibility and EMI performance for integration and lower unit cost - making LTC3736EGN-1#PBF optimal for high-reliability, thermally constrained, or EMI-critical dual-rail systems.
Availability
LTC3736EGN-1#PBF is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and industrial dual-rail power systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across manufacturing lots.
Supply support for LTC3736EGN-1#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, datasheet documentation, and application engineering for legacy Linear power management ICs including the LTC3736 series.
The LTC3736-1 family was designed specifically for high-efficiency, low-noise dual-output DC/DC conversion in battery-powered and space-constrained applications - emphasizing RSENSE-less operation, EMI reduction, and flexible sequencing without external components.
FAQ
What is the maximum input voltage rating for the LTC3736EGN-1#PBF?
The absolute maximum input supply voltage (VIN) for the LTC3736EGN-1#PBF is 10 V. Continuous operation above 9.8 V is not recommended, as the device is specified for reliable operation up to 9.8 V across its full temperature range. Exceeding 10 V risks permanent damage to internal circuitry, particularly the VIN pin ESD protection structures and bias networks.
Does the LTC3736EGN-1#PBF require external current-sense resistors?
No, the LTC3736EGN-1#PBF does not require external current-sense resistors. It uses MOSFET VDS sensing on the SENSE+ and SW pins to measure inductor current, eliminating power loss and board area associated with RSENSE. This architecture is confirmed in the datasheet's "No Current Sense Resistors Required" feature list and functional diagrams for both controller channels.
How does spread spectrum operation reduce EMI in the LTC3736EGN-1#PBF?
The LTC3736EGN-1#PBF's spread spectrum oscillator randomly varies switching frequency between 450 kHz and 580 kHz, distributing energy across a 130 kHz bandwidth instead of concentrating it at a single fundamental frequency and harmonics. As shown in Figures 1c/1d of the datasheet, this lowers peak conducted/radiated EMI amplitude by >20 dBm - directly easing compliance with FCC Part 15 and CISPR 22/32 standards without added filtering.
Can the LTC3736EGN-1#PBF support independent output voltages?
Yes, the LTC3736EGN-1#PBF supports fully independent output voltages. VOUT1 is regulated via VFB1 and its resistor divider; VOUT2 via VFB2 and its separate divider. The TRACK pin enables optional start-up tracking but does not force voltage equality during steady-state operation - both rails maintain their programmed setpoints regardless of load transients on the other channel.
What is the purpose of the IPRG1 and IPRG2 pins on the LTC3736EGN-1#PBF?
The IPRG1 and IPRG2 pins on the LTC3736EGN-1#PBF independently select the maximum peak current sense voltage threshold for each channel: tying to GND selects 85 mV, floating selects 125 mV, and tying to VIN selects 204 mV. This allows optimization of external P-MOSFET RDS(on) and gate drive strength per rail - critical for balancing conduction loss, thermal rise, and current-limit accuracy in asymmetric load applications.
LTC3736EGN-1#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:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3736EGN-1#PBF FAQ
1.How can I place an order for LTC3736EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3736EGN-1#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-1#PBF reliable?
The price and inventory of LTC3736EGN-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3736EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3736EGN-1#PBF?
LTC3736EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3736EGN-1#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-1#PBF?
For technical support, including LTC3736EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EGN-1#PBF requirements.
6.How does Aetrix verify that LTC3736EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3736EGN-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3736EGN-1#PBF?
All LTC3736EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EGN-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3736EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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