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Analog Devices Inc. LTC1436AIGN-PLL#TRPBF
- Part No.:
- LTC1436AIGN-PLL#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1436AIGN-PLL#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,957
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Product details
Overview
LTC1436AIGN-PLL#TRPBF from Analog Devices (formerly Linear Technology) is a phase-lockable, fixed-frequency synchronous step-down switching regulator controller driving external N-channel MOSFETs. It operates from 3.5V to 36V input, delivers up to 5A output with programmable 1.19V–9V regulation, maintains constant frequency down to ~1% load via Adaptive Power™ mode, and integrates a 0.5A low-noise linear regulator for CPU I/O or audio supplies - used in notebook power rails and portable instrumentation.
For engineers reviewing the LTC1436AIGN-PLL#TRPBF datasheet, LTC1436AIGN-PLL#TRPBF pinout, LTC1436AIGN-PLL#TRPBF application, or LTC1436AIGN-PLL#TRPBF equivalent, key selection criteria include PLL-synchronizable oscillator (112–240 kHz), ≤300 ns minimum on-time, dual N-MOSFET synchronous drive, remote sense capability, and 24-lead narrow SSOP package with verified thermal performance (θJA = 110°C/W).
Technical Context
The LTC1436AIGN-PLL#TRPBF implements a current-mode, constant-frequency buck architecture with adaptive output stage control: TGL/BG drive large N-MOSFETs at high load, while TGS enables low-current operation via a smaller MOSFET or Burst Mode when open. Its PLL circuit accepts external sync signals on PLLIN and adjusts oscillator frequency via PLL LPF voltage (0–2.4 V), enabling precise timing alignment in multi-rail systems.
It integrates auxiliary functions including a 0.5A linear regulator controlled by AUXON/AUXDR/AUXFB pins (supporting 12V or adjustable outputs), a low-battery comparator (LBI/LBO, 1.19V threshold), power-on reset timer (65536 cycles ≈ 300 ms), and programmable soft-start via RUN/SS capacitor. The device supports dropout operation up to 99% duty cycle and foldback current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 36V - supports wide-input industrial and battery-powered systems without pre-regulation |
| fOSC (PLL-locked) | 112–240 kHz - selectable via PLL LPF voltage; enables EMI reduction and multi-phase synchronization |
| tON(MIN) | ≤300 ns - allows high-frequency, low-duty-cycle operation (e.g., 3.3V out from 24V in at 400 kHz) |
| Output Voltage Range | 1.19V to 9V - set via VPROG pin state or external divider; includes factory-trimmed 3.3V/5V options |
| IQ (Shutdown) | <25 µA - enables micropower retention in battery-critical applications like PDAs and wireless modems |
| Package | 24-Lead Narrow SSOP (GN) - surface-mount, 150-mil body, θJA = 110°C/W, RoHS-compliant |
| Operating Temp | –40°C to 85°C - qualified for industrial and extended-temperature embedded use |
Pinout & Package
Package: 24-Lead Narrow Plastic SSOP (GN), 150-mil width, exposed pad not present. Thermal resistance θJA = 110°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PLL LPF) | Oscillator control / PLL loop filter output | Drives internal VCO; 0–2.4V input shifts fOSC ±30%; requires RC network to ground for lock stability |
| 2 (COSC) | Oscillator timing capacitor node | External capacitor sets base frequency; value determines 112–138 kHz range (VPLLLPF = 0 V) |
| 3 (RUN/SS) | Soft-start ramp & enable control | Internal 3 µA current charges external capacitor; <1.3 V forces shutdown; >1.3 V initiates controlled startup |
| 4 (ITH) | Error amplifier compensation / current limit threshold | Voltage controls peak inductor current; clamped during soft-start; 0–2.5 V nominal operating range |
| 5 (SFB) | Secondary winding feedback input | Forces continuous conduction when grounded; ties to INTVCC if unused; enables secondary-side regulation |
| 6 (SGND) | Small-signal reference ground | Must be routed separately from PGND to avoid noise coupling into VOSENSE/SENSE paths |
| 7 (VPROG) | Output voltage selection logic | Open = adjustable via external divider; 0 V = 3.3 V; INTVCC = 5 V - enables pin-strapped configurations |
| 8 (VOSENSE) | Main output voltage feedback input | Accepts remote sense from output or divider; referenced to internal 1.19 V bandgap for regulation accuracy |
| 9 (SENSE–) | Current sense comparator negative input | Paired with SENSE+; built-in offset enables accurate RSENSE-based current monitoring (ΔVSENSE(MAX) = 150 mV) |
| 10 (SENSE+) | Current sense comparator positive input | Connects to shunt resistor high side; common-mode range: SGND to INTVCC (4.8–5.2 V) |
| 11 (AUXON) | Auxiliary regulator enable | Logic-high (>1.19 V) activates 0.5 A linear regulator; low disables both regulator and comparator functions |
| 12 (AUXFB) | Auxiliary regulator feedback/comparator input | Connects to PNP collector (12 V mode) or external divider; internal 12 V divider engages when AUXDR > 9.5 V |
| 13 (PLLIN) | External synchronization input | 50 kΩ internal pull-down to SGND; accepts TTL/CMOS clock; rising edge aligns top-FET turn-on when PLL locked |
| 14 (POR) | Power-on reset open-drain output | Pulls low when VOUT is >7.5% out of regulation; releases after 65536 fOSC cycles (~300 ms) once within –5% |
| 15 (BOOST) | Floating top-gate driver supply | Bootstrap node for TGL/TGS; swings from INTVCC to VIN + INTVCC; requires ceramic bootstrap capacitor |
| 16 (TGL) | Main top-N-MOSFET gate driver | High-current floating output (2 A peak); drives large external N-FET; disabled during Adaptive Power low-load mode |
| 17 (SW) | Switch node connection | Connects to inductor; voltage swings from Schottky drop below GND to VIN; critical for layout EMI control |
| 18 (TGS) | Small top-N-MOSFET gate driver | 250 mA peak drive; enables Adaptive Power mode at light loads; left open defaults to Burst Mode |
| 19 (VIN) | Main input supply | 3.5–36 V input; must be decoupled locally to SGND with ≥22 µF low-ESR capacitor |
| 20 (INTVCC) | Internal 5 V regulator output | Supplies core logic and drivers; regulated to 4.8–5.2 V; requires ≥2.2 µF tantalum to PGND |
| 21 (BG) | Bottom-N-MOSFET gate driver | Non-floating 0–INTVCC output (2 A peak); disabled during Adaptive Power low-load mode |
| 22 (PGND) | Power ground return | Connects to bottom FET source and CIN(–); separate from SGND to minimize switching noise injection |
| 23 (EXTVCC) | External VCC switch input | When >4.7 V, bypasses internal LDO to supply INTVCC directly - improves efficiency in high-VOUT designs |
| 24 (AUXDR) | Auxiliary regulator/comparator open-drain output | Drives PNP base (regulator mode) or requires external pull-up (comparator mode); >9.5 V triggers internal 12 V divider |
Key Features
| Feature | Design Value |
|---|---|
| Phase-Lockable Oscillator | Enables precise multi-rail synchronization and EMI shaping via external clock injection on PLLIN |
| Adaptive Power™ Output Stage | Automatically switches between TGL/BG (high load) and TGS-only (low load), sustaining fixed-frequency operation down to ~1% rated current |
| Integrated Auxiliary Linear Regulator | Supports 0.5 A low-noise 12 V or adjustable output using external PNP, reducing BOM count in mixed-supply systems |
| Programmable Soft Start & Shutdown | Controlled ramp-up via RUN/SS capacitor; logic-controlled shutdown draws <25 µA, ideal for battery backup states |
| Remote Output Voltage Sensing | VOSENSE pin accepts Kelvin connection to load, eliminating IR drop errors in high-current PCB traces |
| Built-in Low-Battery Detection | Dedicated LBI/LBO comparator with 1.19 V threshold and 20 mV hysteresis - no external components required |
Applications
| Notebook CPU Core & I/O Power | Portable Instrumentation Power Supply |
|---|---|
Use Scenario: Providing tightly regulated 1.19V–3.3V core and 3.3V/5V I/O rails in space-constrained notebook motherboards with dynamic load steps. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency DC/DC conversion with Adaptive Power™ maintaining stable frequency across sleep-to-active transitions. Use Value: Eliminates need for discrete low-noise LDO post-regulators on I/O rails by integrating a 0.5A auxiliary linear regulator with remote sense. | Use Scenario: Powering precision analog front-ends and microcontrollers in handheld test equipment operating from 3-cell Li-ion (9–12.6 V). IC Role / Device Role / Timing Role: Main step-down controller delivering 3.3V/5V with <±0.8% load regulation and 1.19V reference accuracy, synchronized to system clock via PLLIN. Use Value: Constant-frequency operation down to 1% load avoids audible noise and ensures clean ADC reference supply during low-power measurement modes. |
| Wireless Modem Baseband Power | Battery-Operated Medical Sensor Hub |
Use Scenario: Supplying burst-mode 1.8V/2.8V rails to LTE/Wi-Fi baseband ICs with rapid load transients and strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck controller using PLL synchronization to align switching edges with RF transmit windows, minimizing spectral interference. Use Value: ≤300 ns minimum on-time enables efficient 2.8V output from 12.6V battery without requiring intermediate conversion stages. | Use Scenario: Long-life wearable sensor hub powered by coin cell or rechargeable LiPo, requiring ultra-low quiescent current and reliable brownout detection. IC Role / Device Role / Timing Role: Dual-output power manager: main buck for digital subsystem and auxiliary LDO for analog sensors, with integrated LBO comparator for battery health monitoring. Use Value: <25 µA shutdown current extends battery life; LBI/LBO pins provide direct low-battery signaling without external comparators or resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Wider VIN (4–60 V), integrated MOSFET drivers only (no external FET control), no PLL sync, higher IQ (45 µA shutdown) | Targeted at automotive (60 V transients) and industrial high-VIN systems; lacks Adaptive Power™ and remote sense | Select when input exceeds 36 V or integrated drivers suffice; avoid when PLL sync or ultra-low IQ is required |
| MP2451DT-LF-Z | Fixed 3.3V/5V output (non-adjustable), no auxiliary LDO, no PLL, no remote sense, lower max IOUT (0.6 A) | Cost-optimized for simple fixed-output consumer devices; lacks programmability and secondary features | Select for basic, low-cost point-of-load where flexibility and auxiliary regulation are unnecessary |
Compared with LTC3891EMSE#PBF and MP2451DT-LF-Z, the LTC1436AIGN-PLL#TRPBF uniquely combines PLL synchronization, Adaptive Power™ mode, integrated auxiliary LDO, and remote sensing - making it optimal for high-performance portable and instrumentation power where timing control, light-load efficiency, and multi-rail integration are critical.
Availability
LTC1436AIGN-PLL#TRPBF is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and wireless modem power management requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 85°C).
Supply support for LTC1436AIGN-PLL#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1436A series belongs to Linear's high-efficiency DC/DC controller product line, designed specifically for compact, high-density power supplies in portable and battery-operated systems demanding precision regulation, low quiescent current, and advanced feature integration.
FAQ
What is the function of the PLLIN and PLL LPF pins on the LTC1436AIGN-PLL#TRPBF?
The PLLIN pin accepts an external clock signal to synchronize the LTC1436AIGN-PLL#TRPBF's oscillator, aligning top-FET turn-on with the rising edge of that signal. The PLL LPF pin outputs the phase detector current and serves as the oscillator control voltage (0–2.4 V), enabling frequency shifting and stable lock. When unused, PLLIN must be tied to SGND and PLL LPF left open or grounded.
Can the LTC1436AIGN-PLL#TRPBF operate without external MOSFETs?
No. The LTC1436AIGN-PLL#TRPBF is a controller IC-not a converter with integrated power switches-and requires external N-channel MOSFETs for both high-side (driven by TGL/TGS) and low-side (driven by BG) operation. It does not contain internal power FETs; its gate drivers are designed explicitly for external discrete transistors.
How does the Adaptive Power™ mode work in the LTC1436AIGN-PLL#TRPBF?
Adaptive Power™ mode dynamically routes gate drive from TGL/BG (large FETs) to TGS-only (small FET + Schottky) as load decreases, maintaining fixed-frequency operation down to ~1% of full load. This avoids efficiency collapse and audible noise associated with Burst Mode. If TGS is left unconnected, the LTC1436AIGN-PLL#TRPBF defaults to standard Burst Mode instead.
What output voltage options does the LTC1436AIGN-PLL#TRPBF support, and how are they selected?
The LTC1436AIGN-PLL#TRPBF supports 1.19V (adjustable), 3.3V, and 5V outputs. Selection is made via the VPROG pin: open-circuit enables external resistor divider on VOSENSE; 0 V selects 3.3V; INTVCC voltage selects 5V. All options use the same internal 1.19V reference, ensuring ±0.8% load regulation across the range.
Is the auxiliary linear regulator in the LTC1436AIGN-PLL#TRPBF configurable for voltages other than 12V?
Yes. When AUXDR voltage remains below 8.5V, the internal 12V resistive divider is disabled, allowing an external feedback divider from AUXFB to ground to set custom output voltages. The auxiliary regulator supports up to 0.5A with low noise and dropout - commonly used for CPU I/O or audio bias supplies in addition to 12V VPP generation.
LTC1436AIGN-PLL#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:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 30V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power on Reset, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1436AIGN-PLL#TRPBF FAQ
1.How can I place an order for LTC1436AIGN-PLL#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1436AIGN-PLL#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 LTC1436AIGN-PLL#TRPBF reliable?
The price and inventory of LTC1436AIGN-PLL#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1436AIGN-PLL#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1436AIGN-PLL#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1436AIGN-PLL#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1436AIGN-PLL#TRPBF?
LTC1436AIGN-PLL#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1436AIGN-PLL#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 LTC1436AIGN-PLL#TRPBF?
For technical support, including LTC1436AIGN-PLL#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1436AIGN-PLL#TRPBF requirements.
6.How does Aetrix verify that LTC1436AIGN-PLL#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1436AIGN-PLL#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 LTC1436AIGN-PLL#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1436AIGN-PLL#TRPBF?
All LTC1436AIGN-PLL#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1436AIGN-PLL#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 LTC1436AIGN-PLL#TRPBF part is unused and in its original packaging.
Return procedure for LTC1436AIGN-PLL#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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