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Analog Devices Inc. LTC1436AEGN#PBF
- Part No.:
- LTC1436AEGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1436AEGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,376
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Product details
Overview
LTC1436AEGN#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller with integrated adaptive power stage, programmable fixed-frequency PLL lockable oscillator, and auxiliary 0.5A linear regulator. It operates from 3.5V to 36V input, delivers up to 5A output at 1.19V–9V (pin-selectable), maintains constant frequency down to ~1% load via TGS-driven low-current mode, and supports remote voltage sensing. It is used in notebook CPU core/I/O supplies requiring high efficiency and low noise.
For engineers reviewing the LTC1436AEGN#PBF datasheet, LTC1436AEGN#PBF pinout, LTC1436AEGN#PBF application, or LTC1436AEGN#PBF equivalent, key selection criteria include its 24-lead SSOP package, ≤300ns minimum on-time for high-frequency/low-duty-cycle operation, dual N-channel synchronous drive architecture, 0.5A auxiliary LDO capability, and support for both continuous and Adaptive Power™ low-load modes.
Technical Context
The LTC1436AEGN#PBF implements a current-mode, fixed-frequency step-down control architecture with an error amplifier (ITH pin), peak-current sensing (SENSE+/–), and adaptive gate drive routing between TGL/BG (high-current) and TGS (low-current) outputs. Its oscillator frequency (112–138 kHz typical, up to 400 kHz) is set by COSC and can be phase-locked via PLLIN/PLL LPF pins in PLL-enabled variants.
It integrates a dropout detector that forces periodic top-FET off-time to recharge the bootstrap capacitor during low-VIN–VOUT operation, enabling ≥99% duty cycle. The auxiliary regulator block uses AUXON/AUXFB/AUXDR pins to control an external PNP pass device for 12V or adjustable low-noise outputs, with internal 12V resistive divider activated when AUXDR > 9.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 36V - supports wide-input industrial/battery systems without pre-regulation |
| Output Voltage | 1.19V (adjustable), 3.3V, or 5V - selected via VPROG pin state; enables fast BOM standardization |
| fOSC Range | 112–138 kHz (typ), up to 400 kHz - balances efficiency vs. size; PLL lockable in LTC1436A-PLL variant |
| tON(MIN) | ≤300 ns - allows high-frequency operation at low duty cycles (e.g., 5V→1.2V @ 2MHz) |
| IQ (Shutdown) | <25 µA - enables micropower battery hold-up in portable systems |
| Max Duty Cycle | 99% - supports ultra-low dropout operation critical for battery-powered applications |
| Aux Regulator | 0.5A linear output - provides low-noise I/O or audio supply independent of main switcher |
Pinout & Package
Package: 24-lead narrow SSOP (GN), 150-mil body, 0.635 mm pitch, RoHS-compliant (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.5V–36V; requires local decoupling to SGND |
| INTVCC | Internal 5V regulator output | Powers control logic and drivers; must be decoupled with ≥2.2µF |
| TGL | Top-gate driver (large MOSFET) | Floating output driving main high-side N-MOSFET; swing = INTVCC + SW |
| TGS | Top-gate driver (small MOSFET) | Enables Adaptive Power™ low-load mode; open = Burst Mode default |
| BG | Bottom-gate driver | Drives synchronous N-MOSFET; swing = 0V to INTVCC |
| SENSE+ | Current sense (+) input | With SENSE–, sets peak current limit via RSENSE; common-mode range = SGND to INTVCC |
| VOSENSE | Remote output voltage feedback | Connects to output or divider; VPROG selects reference point (internal/external) |
| RUN/SS | Enable & soft-start control | <1.3V = shutdown; capacitor to ground sets ramp time (~0.5 s/µF) |
| PLLIN | External sync input (PLL mode) | Internally terminated to SGND with 50kΩ; unused = tie to SGND |
| AUXON | Auxiliary regulator enable | >1.19V = active; controls external PNP base via AUXDR |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ Output Stage | Automatically switches gate drive from TGL/BG to TGS/BG below ~1% load, maintaining fixed frequency and avoiding burst-mode EMI |
| Programmable Soft Start | RUN/SS pin accepts external capacitor to control inrush current ramp rate and prevent output overshoot |
| Dual Regulation Paths | Supports main output regulation via VOSENSE + VPROG, and auxiliary 12V/adjustable output via AUXFB/AUXDR with automatic 12V divider activation above 9.5V |
| Low-Battery Detection | Integrated comparator (LBI/LBO) with 1.19V threshold and 20mV hysteresis for system-level brownout warning |
| Power-On Reset Timer | POR pin asserts open-drain low until output reaches –5% regulation, then delays 65536 oscillator cycles (~300ms @ 125kHz) before release |
Applications
| Portable Computing Power | Industrial DC Distribution |
|---|---|
|
Use Scenario: Notebook motherboard CPU I/O rail supplying DDR memory and chipset interfaces. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 3.3V/5V at up to 5A with remote sensing and low-noise auxiliary LDO for analog subsystems. Use Value: 99% duty cycle enables operation down to 3.6V input; Adaptive Power™ eliminates audible noise and EMI spikes during light-load states. |
Use Scenario: DIN-rail mounted 24V-to-12V/5V conversion module powering PLC I/O and sensors. IC Role / Device Role / Timing Role: High-voltage input controller managing wide VIN range and supporting auxiliary 12V rail for fieldbus transceivers. Use Value: 36V absolute max VIN rating and robust thermal design (θJA = 110°C/W) ensure reliability in unregulated industrial supplies. |
| Battery-Powered Instrumentation | Wireless Modem Power Management |
|
Use Scenario: Handheld multimeter or data logger powered by two Li-ion cells (6V–8.4V). IC Role / Device Role / Timing Role: Step-down controller generating stable 3.3V for MCU and ADC, with low-IQ shutdown and low-battery detection. Use Value: <25 µA shutdown current extends battery life; LBO/LBI pins provide precise 1.19V brownout threshold without external components. |
Use Scenario: LTE/Wi-Fi modem module requiring clean 1.8V/3.3V rails and fast transient response during RF transmit bursts. IC Role / Device Role / Timing Role: Main power controller with ≤300ns min on-time and fast current-mode loop for sub-µs load-step recovery. Use Value: Current-mode architecture and 125kHz typical fOSC deliver <100 µs transient response; remote sensing compensates for PCB trace IR drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1436ACGN#PBF | Same die, 0°C to 70°C commercial temp grade (vs. –40°C to 85°C for LTC1436AEGN#PBF) | Suitable for non-industrial environments; lower cost but not qualified for extended temperature operation | Select LTC1436ACGN#PBF only if ambient operating temperature remains within 0°C–70°C and lifecycle continuity is prioritized over extended temp margin |
| LTC1437ACG#PBF | 28-lead SSOP package, includes NC pin and LBO/LBI pins relocated; identical electrical specs and temp range | Offers additional layout flexibility and dedicated low-battery pins; requires PCB redesign due to different pin count and mapping | Choose LTC1437ACG#PBF when explicit low-battery monitoring is required and board space allows 28-pin footprint |
Compared with LTC1436ACGN#PBF, the LTC1436AEGN#PBF adds extended temperature qualification and tighter parametric guarantees across –40°C to 85°C; compared with LTC1437ACG#PBF, it offers identical functionality in a smaller 24-pin package but lacks dedicated LBO/LBI pins, requiring shared use of POR/LBI functions.
Availability
LTC1436AEGN#PBF is available at Aetrix Electronics and suitable for portable computing power, industrial DC distribution, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for LTC1436AEGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1436A series belongs to Linear Technology's high-efficiency DC/DC controller product line, designed specifically for demanding portable and industrial power applications requiring wide input range, adaptive low-load operation, and integrated auxiliary regulation.
FAQ
What is the operating temperature range for the LTC1436AEGN#PBF?
The LTC1436AEGN#PBF is specified for operation from –40°C to +85°C (industrial temperature grade). This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics notes, where parameters marked with ● apply across this full range. The LTC1436AEGN#PBF part number suffix "E" explicitly denotes the extended temperature grade.
Does the LTC1436AEGN#PBF support phase-lock synchronization?
The LTC1436AEGN#PBF does not include PLL circuitry. Only the LTC1436A-PLL and LTC1437A variants feature the PLLIN and PLL LPF pins and associated phase detector. The LTC1436AEGN#PBF uses a standard fixed-frequency oscillator controlled solely by the COSC capacitor; PLL functionality is absent per the Functional Diagram and Pin Functions documentation.
How is the output voltage selected on the LTC1436AEGN#PBF?
The LTC1436AEGN#PBF supports three output voltage configurations via the VPROG pin: open-circuit for adjustable output (1.19V reference), 0V for 3.3V output, or INTVCC for 5V output. These selections are validated in the Electrical Characteristics table under "VOUT Regulated Output Voltage", with tolerances of ±1.0% for 3.3V and ±2.0% for 5V at TA = 25°C.
What is the purpose of the TGS pin on the LTC1436AEGN#PBF?
The TGS pin on the LTC1436AEGN#PBF drives a small external N-channel MOSFET during light-load conditions to enable Adaptive Power™ mode-maintaining constant switching frequency down to ~1% of full load. If left open, the LTC1436AEGN#PBF defaults to Burst Mode operation. This behavior is detailed in the "Low Current Operation" section of the Applications Information.
Can the LTC1436AEGN#PBF drive an external PNP transistor for a 12V auxiliary supply?
Yes. The LTC1436AEGN#PBF includes a dedicated auxiliary regulator block using AUXON, AUXFB, and AUXDR pins. When AUXDR voltage exceeds 9.5V, the internal 12V resistive divider connects to AUXFB, enabling direct 12V output with an external PNP pass device. This is confirmed in the Electrical Characteristics table (VAUXFB = 11.5–12.5V) and Applications Information section.
LTC1436AEGN#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:
- 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
LTC1436AEGN#PBF FAQ
1.How can I place an order for LTC1436AEGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1436AEGN#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 LTC1436AEGN#PBF reliable?
The price and inventory of LTC1436AEGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1436AEGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1436AEGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1436AEGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1436AEGN#PBF?
LTC1436AEGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1436AEGN#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 LTC1436AEGN#PBF?
For technical support, including LTC1436AEGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1436AEGN#PBF requirements.
6.How does Aetrix verify that LTC1436AEGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1436AEGN#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 LTC1436AEGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1436AEGN#PBF?
All LTC1436AEGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1436AEGN#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 LTC1436AEGN#PBF part is unused and in its original packaging.
Return procedure for LTC1436AEGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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