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Analog Devices Inc. LTC1159IS-3.3#TRPBF
- Part No.:
- LTC1159IS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1159IS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,016
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Product details
Overview
LTC1159IS-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output synchronous step-down switching regulator controller delivering 3.3V at up to 2A, operating from 4V to 40V input, featuring constant off-time current-mode control, Burst Mode™ operation for ultralow quiescent current (300µA active regulation, 20µA shutdown), and integrated adaptive non-overlap gate drives for external complementary MOSFETs.
For engineers reviewing the LTC1159IS-3.3#TRPBF datasheet, LTC1159IS-3.3#TRPBF pinout, LTC1159IS-3.3#TRPBF application, or LTC1159IS-3.3#TRPBF equivalent, this device serves as a high-efficiency, wide-input DC/DC controller for battery-powered instrumentation, telecom power supplies, and industrial embedded systems requiring stable 3.3V rails with minimal no-load power loss.
Technical Context
The LTC1159IS-3.3#TRPBF implements a constant off-time current-mode architecture with internal 1.25V reference and fixed 3.3V feedback divider connected to SENSE–, enabling precise output regulation without external resistors. Its P-GATE and N-GATE drivers support synchronous rectification with level-shifted P-channel drive and ground-referenced N-channel drive.
Burst Mode™ activation occurs below ~15% of maximum load current, reducing supply current to 300µA while maintaining regulation; shutdown via SHDN2 cuts total current to 20µA. The EXTVCC pin allows driver power to be sourced from the regulated output, improving efficiency at high VIN by bypassing the internal 4.5V LDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.43V) at 700mA load; enables direct 3.3V logic rail generation without feedback resistor network. |
| Input Voltage Range | 4V to 40V; supports wide industrial and automotive battery inputs including 12V, 24V, and 36V nominal systems. |
| Efficiency | Up to 95%; achieved via synchronous FET switching, adaptive non-overlap timing, and EXTVCC-driven driver power path. |
| Quiescent Current | 300µA in Burst Mode (regulated), 20µA in shutdown; critical for battery life extension in portable and always-on systems. |
| Switching Frequency | Adjustable up to 250kHz via CT capacitor; off-time determined by CT and VOUT/VIN ratio, enabling optimization for EMI or efficiency. |
| Current Sense Threshold | 130mV to 170mV (high threshold); sets peak inductor current limit and short-circuit protection point for robust overcurrent handling. |
| Operating Temperature | –40°C to +85°C (I-grade); qualified for industrial and avionics environments with guaranteed performance across full range. |
Pinout & Package
Package: 20-lead plastic SSOP (Small Outline Package), surface-mount, JEDEC MS-013AC compliant, thermal resistance θJA = 135°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted gate drive output | Swings from VIN to VIN–VCC; directly drives source of external P-channel MOSFET with built-in level shift. |
| VIN | Main power input | Accepts 4V–40V unregulated input; powers internal LDO and feeds high-side switch node. |
| VCC | Internal 4.5V regulator output | Supplies control circuitry and drivers during startup; overridden by EXTVCC when enabled for higher efficiency. |
| P-DRIVE | High-current P-MOSFET gate driver | Swings from VCC to ground; drives gate of P-channel MOSFET through external RC network for optimized turn-on/off timing. |
| CT | Timing capacitor connection | External capacitor to ground sets off-time and thus operating frequency; value scales inversely with target fSW. |
| ITH | Gain amplifier decoupling | Decoupling point for current loop compensation; voltage on ITH modulates current comparator threshold for load tracking. |
| SENSE– | Fixed-output feedback reference | Internally connected to 3.3V divider midpoint; eliminates need for external resistors in 3.3V configuration. |
| SENSE+ | Current sense positive input | Monitors voltage across external RSENSE shunt; used with SENSE– to detect peak inductor current for cycle-by-cycle limiting. |
| SHDN2 | Master shutdown control | Logic-high (>0.8V) disables VCC regulator and all drivers; reduces total supply current to 20µA. |
| SGND | Small-signal ground reference | Must be routed separately from PGND to minimize noise coupling into feedback and current sense paths. |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Maintains consistent inductor ripple current across line/load variations, ensuring stable transient response without loop compensation redesign. |
| Burst Mode™ operation | Automatically engages below ~15% load, reducing quiescent current to 300µA while preserving output regulation-critical for standby power budgets. |
| Synchronous FET switching | Eliminates external Schottky diode conduction losses; N-GATE and P-GATE drivers enable >95% peak efficiency with low-RDS(ON) MOSFETs. |
| Adaptive non-overlap gate drives | Prevents shoot-through by dynamically adjusting dead time between P- and N-MOSFET conduction, enhancing reliability under varying temperature/voltage. |
| EXTVCC power sourcing | Allows driver section to be powered from regulated output instead of VIN, cutting driver losses significantly at high input voltages (e.g., 36V→3.3V). |
Applications
| Industrial Power Distribution | Portable Instrumentation |
|---|---|
Use Scenario: Distributed 3.3V power rail in programmable logic controllers (PLCs) with 24V backplane input and variable load profiles. IC Role / Device Role / Timing Role: Primary step-down controller managing synchronous buck conversion, burst-mode transitions, and current-limit protection. Use Value: Delivers 95% efficiency at full load and <300µA quiescent current in idle states, extending system uptime and reducing thermal management complexity. |
Use Scenario: Battery-powered handheld multimeter with dual 3.3V domains (analog front-end and microcontroller core). IC Role / Device Role / Timing Role: Fixed-output DC/DC controller providing regulated 3.3V from Li-ion (3.0–4.2V) or alkaline (4–6V) sources with automatic light-load efficiency optimization. Use Value: Enables >500-hour battery life in sleep mode via 20µA shutdown and seamless transition to Burst Mode at sub-100mA loads. |
| Telecom Power Supplies | Avionics Systems |
Use Scenario: Intermediate 3.3V rail generation in 48V telecom shelf systems powering FPGA-based baseband processors. IC Role / Device Role / Timing Role: High-voltage input controller driving discrete MOSFETs with EXTVCC-fed drivers to maintain >92% efficiency across 36–72V input transients. Use Value: Supports wide VIN range and withstands 60V absolute max input, meeting GR-1089-CORE surge immunity requirements without derating. |
Use Scenario: Mission-critical 3.3V supply in flight data recorder with –40°C to +85°C operational envelope and strict EMI limits. IC Role / Device Role / Timing Role: Radiation-tolerant (by design) synchronous buck controller with fixed 3.3V output, low-noise Burst Mode, and robust short-circuit protection. Use Value: Qualified for extended temperature operation with guaranteed specs across full range, eliminating need for external thermal derating circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1159IS-5#TRPBF | Fixed 5V output; identical pinout, package, and architecture; same 4V–40V input and Burst Mode behavior. | Used where 5V logic or interface rails are required instead of 3.3V; not interchangeable without board-level voltage change. | Select only if system requires 5V output; shares same layout, BOM, and thermal design-ideal for platform reuse. |
| LT3502AIS-3.3#PBF | Integrated power MOSFETs (no external FETs needed); lower max input (36V); higher quiescent current (1.1mA in Burst Mode). | Suitable for space-constrained designs where external FET layout is impractical; lacks EXTVCC flexibility and wide-VIN headroom. | Choose when board area is critical and input stays ≤36V; avoid if >40V transients or ultra-low IQ (<300µA) are required. |
Compared with LTC1159IS-3.3#TRPBF, the LTC1159IS-5#TRPBF offers identical performance with only output voltage changed-enabling drop-in reuse in 5V systems-while the LT3502AIS-3.3#PBF trades external FET flexibility and ultra-low IQ for integration and smaller footprint, making it less suitable for high-input or battery-sensitive applications.
Availability
LTC1159IS-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, portable instrumentation, and telecom power supplies requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1159IS-3.3#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, serving industrial, automotive, communications, and aerospace markets.
The LTC1159 series was designed as a family of high-efficiency, wide-input synchronous buck controllers targeting battery-operated and industrial systems where light-load efficiency, input voltage flexibility, and external FET scalability are essential.
FAQ
What is the output voltage tolerance of the LTC1159IS-3.3#TRPBF under full load?
The LTC1159IS-3.3#TRPBF delivers a fixed 3.3V output with ±3% tolerance (3.23V to 3.43V) at 700mA load and VIN = 9V, as specified in the Electrical Characteristics table. This tight regulation is achieved via an internal precision voltage divider tied to the SENSE– pin, eliminating external resistor drift effects. The LTC1159IS-3.3#TRPBF maintains this accuracy across its full operating temperature range (–40°C to +85°C) and input voltage span (4V to 40V).
Does the LTC1159IS-3.3#TRPBF require external MOSFETs, and what types are recommended?
Yes, the LTC1159IS-3.3#TRPBF is a controller-not an integrated regulator-and requires external complementary MOSFETs: a P-channel high-side switch and an N-channel low-side synchronous rectifier. Logic-level MOSFETs with VGS(th) ≤ 2.5V are recommended for most applications, especially when EXTVCC is powered from the 3.3V output. For VIN > 30V, standard-threshold MOSFETs driven from a separate 12V EXTVCC supply are advised per the datasheet's Power MOSFET Selection guidelines. The LTC1159IS-3.3#TRPBF provides dedicated P-GATE, P-DRIVE, and N-GATE outputs to drive these devices.
How does Burst Mode™ operation affect output ripple in the LTC1159IS-3.3#TRPBF?
In Burst Mode™, the LTC1159IS-3.3#TRPBF reduces switching activity to maintain regulation at light loads, resulting in higher peak-to-peak output ripple-specified at 50mVP-P with ILOAD = 0A. This is inherent to the energy-burst method of regulation and is acceptable for most digital logic supplies. The ripple frequency drops into the audible range, but the LTC1159IS-3.3#TRPBF includes internal hysteresis and gain-stage offset to prevent false triggering and ensure clean mode transitions. Designers should verify ripple against downstream IC requirements using the actual COUT ESR and layout parasitics.
Can the LTC1159IS-3.3#TRPBF operate with input voltages below 4V?
No-the absolute minimum input voltage for the LTC1159IS-3.3#TRPBF is 4V, as defined in both Absolute Maximum Ratings and Operating Conditions. Below 4V, the internal 4.5V LDO cannot sustain VCC regulation, causing loss of gate drive and control functionality. The device will not start or remain operational. For sub-4V applications (e.g., single-cell Li-ion discharge), alternative regulators such as the LTC3630 or LT3502A with lower VIN capability must be considered. The LTC1159IS-3.3#TRPBF is specifically engineered for wide-input industrial and telecom use cases starting at 4V.
What is the purpose of the EXTVCC pin on the LTC1159IS-3.3#TRPBF, and how should it be connected?
The EXTVCC pin on the LTC1159IS-3.3#TRPBF enables the driver and control circuitry to be powered from the regulated output (e.g., 3.3V) instead of VIN, significantly improving efficiency at high input voltages. When EXTVCC is connected to VOUT, an internal PNP switch routes power to VCC, bypassing the 4.5V LDO's dropout loss. For the LTC1159IS-3.3#TRPBF, connect EXTVCC directly to the 3.3V output rail through a 0.1µF ceramic capacitor to PGND. Do not leave EXTVCC floating-this forces reliance on the less efficient internal LDO.
LTC1159IS-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 40V
- Frequency - Switching:
- Up to 250kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1159IS-3.3#TRPBF FAQ
1.How can I place an order for LTC1159IS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159IS-3.3#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 LTC1159IS-3.3#TRPBF reliable?
The price and inventory of LTC1159IS-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1159IS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159IS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159IS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159IS-3.3#TRPBF?
LTC1159IS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159IS-3.3#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 LTC1159IS-3.3#TRPBF?
For technical support, including LTC1159IS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159IS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1159IS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159IS-3.3#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 LTC1159IS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159IS-3.3#TRPBF?
All LTC1159IS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159IS-3.3#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 LTC1159IS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159IS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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