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Analog Devices Inc. LTC1159CS#PBF
- Part No.:
- LTC1159CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1159CS#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,520
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Product details
Overview
LTC1159CS#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary MOSFETs in constant off-time current-mode architecture. It operates from 4V to 40V input, delivers up to 95% efficiency, maintains regulation down to 20µA shutdown current, supports user-programmable output current via RSENSE, and enables ultralow-dropout operation with 100% duty cycle capability - used in high-efficiency battery-powered industrial power supplies.
For engineers reviewing the LTC1159CS#PBF datasheet, LTC1159CS#PBF pinout, LTC1159CS#PBF application, or LTC1159CS#PBF equivalent, this page provides verified package mapping (16-lead SO), confirmed pin functions (P-GATE, N-GATE, SENSE+, SHDN2, CT, VFB), exact operating parameters (tOFF = 3.5–6.5 µs, VFB = 1.25 V, ISHDN2 = 12–20 µA), and validated alternative options for fixed-output and adjustable DC/DC controller designs.
Technical Context
The LTC1159CS#PBF implements a constant off-time current-mode control architecture with adaptive non-overlap gate drives and automatic Burst Mode™ operation below ~15% load. Its internal 4.5V LDO powers control circuitry at startup, while EXTVCC allows driver supply derivation from the regulated output for improved high-VIN efficiency.
It features dual shutdown inputs (SHDN1 disables control only; SHDN2 shuts down VCC and entire system), programmable current sensing via SENSE+/SENSE− with 25 mV low-threshold and 125–175 mV high-threshold modes, and precise off-time setting via CT capacitor (3.5–6.5 µs typical) that scales inversely with input-to-output voltage ratio.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide-input industrial and telecom power rails without external pre-regulation. |
| Efficiency | Up to 95% - achieved via synchronous FET switching and adaptive non-overlap timing, minimizing shoot-through losses. |
| Shutdown Current | 20µA - enables ultra-low-power standby in battery-critical applications like portable instruments. |
| Off-Time (tOFF) | 3.5–6.5 µs - sets minimum switch-off duration; determines operating frequency inversely with (VIN–VOUT)/VIN ratio. |
| Feedback Voltage (VFB) | 1.25 V (±4%) - reference for external resistor divider; enables precise adjustable output voltage programming. |
| Current Sense Threshold | 25 mV (low) / 150 mV (high) - defines peak inductor current limit and short-circuit protection trip point. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for enclosed industrial and computing environments. |
Pinout & Package
Package: 16-lead plastic SO (Small Outline) per manufacturer ordering code LTC1159CS; θJA = 110°C/W; RoHS-compliant, lead-free (PbF).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted P-MOSFET gate drive output | Swings from VIN to VIN–VCC; drives high-side P-channel MOSFET with integrated level shift. |
| N-GATE | N-MOSFET gate drive output | Ground-referenced output (0–VCC); directly drives low-side N-channel MOSFET. |
| SENSE+ | Current sense comparator positive input | Connects across RSENSE; detects inductor current via voltage drop for cycle-by-cycle current limiting. |
| SENSE− | Current sense comparator negative input / fixed-output reference node | In adjustable versions, connects to external divider; in fixed versions, ties to internal 3.3V/5V divider tap. |
| SHDN2 | Master shutdown input | Logic-high (>1.4V) disables VCC regulator and all drivers; draws ≤20 µA; enables full-system power gating. |
| VFB | Feedback input (adjustable version only) | Receives divided output voltage; regulates output by comparing to 1.25V internal reference. |
| CT | Timing capacitor connection | External capacitor sets off-time; value determines switching frequency and load transient response speed. |
| VIN | Main power input | Accepts 4–40V unregulated input; supplies internal LDO and EXTVCC switch; requires local 100µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~15% load to reduce quiescent current to 300 µA while maintaining regulation - critical for battery runtime extension. |
| Synchronous FET control | Drives complementary P/N external MOSFETs with adaptive non-overlap timing - eliminates body-diode conduction loss and improves light-load efficiency. |
| EXTVCC power routing | Internal PNP switch allows VCC to be powered from regulated output instead of VIN - reduces driver losses by >30% at high input voltages (e.g., 36V→5V). |
| Short-circuit protection | Automatic tOFF extension during overload limits average short-circuit current to ~IMAX - prevents thermal runaway without external circuitry. |
| Constant off-time architecture | Maintains stable ripple current and fast line/load transient response independent of input/output voltage - simplifies loop compensation. |
Applications
| Industrial Power Distribution | Notebook Computer Power |
|---|---|
Use Scenario: Distributed 24V-to-5V conversion in PLC backplanes with variable load profiles and thermal constraints. IC Role / Device Role / Timing Role: Primary controller for synchronous buck stage driving Si9435DY/Si9410DY MOSFET pair; manages Burst Mode entry/exit based on real-time load current. Use Value: 95% peak efficiency and 20µA shutdown current extend uptime in fanless enclosures; 110°C/W θJA enables compact heatsink-free layout. |
Use Scenario: Main 12V-to-3.3V/5V core power supply in space-constrained notebook mainboards. IC Role / Device Role / Timing Role: Adjustable-output controller using VFB feedback; coordinates P-GATE/N-GATE timing with <100 ns transition times to minimize dead-time losses. Use Value: Programmable RSENSE-based current limit (150 mV threshold) ensures safe operation during CPU burst loads; CT pin enables frequency tuning for EMI compliance. |
| Portable Test Instruments | Avionics Power Conditioning |
Use Scenario: Battery-powered handheld multimeter requiring stable 3.3V rail across 8–36V Li-ion pack voltage range. IC Role / Device Role / Timing Role: Fixed-output LTC1159CS-3.3 variant (implied by CS suffix and family context); uses internal SENSE− divider for setpoint accuracy. Use Value: 4V minimum input enables operation down to single-cell LiFePO4 (2.5V nominal, 3.2V typical); 300µA Burst Mode current preserves battery life during measurement idle periods. |
Use Scenario: 28V aircraft bus-to-5V logic supply in flight control units where reliability and transient immunity are critical. IC Role / Device Role / Timing Role: Controller with SHDN2-linked safety interlock; leverages >60dB line rejection and negative-VIN transient protection via external diode. Use Value: Dual shutdown (SHDN1 + SHDN2) supports fail-safe power sequencing; 125°C max junction temperature meets DO-160 environmental requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1149CS#PBF | No EXTVCC switch; higher 100µA shutdown current; same SO-16 package and pinout. | Lacks output-derived driver supply - less efficient above 24V input; no Burst Mode optimization for ultra-low-IQ. | Choose when cost sensitivity outweighs efficiency at high VIN or when legacy design reuse is required. |
| LT3502AIS#PBF | Integrated 3A power switches; fixed 5V/3.3V options; 3mm × 3mm DFN package; no external MOSFET support. | Not a controller - eliminates external FETs but sacrifices flexibility in current scaling and thermal management. | Choose for space-constrained, lower-current (<2A) applications where board area > efficiency optimization priority. |
Compared with LTC1159CS#PBF, LTC1149CS#PBF offers identical topology and layout compatibility but lacks EXTVCC efficiency enhancement and deeper sleep mode, while LT3502AIS#PBF trades external FET control for integration and size reduction - making LTC1159CS#PBF optimal for high-efficiency, thermally managed, medium-power industrial buck designs.
Availability
LTC1159CS#PBF is available at Aetrix Electronics and suitable for industrial power distribution, avionics conditioning, and portable instrumentation requiring stable component supply with long lifecycle visibility and traceable sourcing.
Supply support for LTC1159CS#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; Linear pioneered high-performance analog ICs including precision regulators, data converters, and power management solutions.
The LTC1159CS#PBF belongs to Linear's synchronous buck controller product line, designed specifically for high-efficiency, wide-input industrial and portable power conversion where external MOSFET optimization and ultra-low quiescent current are essential.
FAQ
What is the function of the SHDN1 and SHDN2 pins on the LTC1159CS#PBF?
The SHDN1 pin disables only the control circuitry while leaving VCC active - useful for temporary regulation suspension without resetting bias conditions. The SHDN2 pin is the master shutdown: pulling it high disables VCC, drivers, and all internal circuitry, reducing total supply current to 20µA. Both pins are referenced to SGND, and SHDN2 must be used for true zero-power state in the LTC1159CS#PBF.
Can the LTC1159CS#PBF be used with fixed 3.3V or 5V output configurations?
Yes - although LTC1159CS#PBF is the base adjustable version (requiring external VFB divider), the same SO-16 package hosts pin-compatible fixed-output variants LTC1159CS-3.3#PBF and LTC1159CS-5#PBF. These use internal SENSE− dividers to set 3.3V or 5V outputs with ±3% tolerance over load and line, eliminating external resistors while retaining identical timing, protection, and Burst Mode behavior as the LTC1159CS#PBF.
How does the EXTVCC pin improve efficiency in the LTC1159CS#PBF?
The EXTVCC pin allows the LTC1159CS#PBF's internal driver and control circuits to be powered from the regulated output instead of VIN. When VIN is high (e.g., 36V) and VOUT is low (e.g., 5V), powering drivers from VOUT reduces gate drive losses by avoiding large VGS swings across the P-MOSFET. This yields measurable efficiency gains - up to 3–5% at high input voltages - and is enabled by an internal PNP switch between EXTVCC and VCC in the LTC1159CS#PBF.
What is the recommended RSENSE value for a 2A maximum output current with the LTC1159CS#PBF?
For 2A maximum output, the recommended RSENSE is 0.05Ω - derived from the formula RSENSE = 100 mΩ / IMAX with margin, matching Figure 2 in the datasheet. This yields a 150mV high-threshold trip point for short-circuit protection and ensures IRIPPLE(P-P) ≤ 25mV/RSENSE for reliable Burst Mode activation below 300mA. Use metal-strip or low-tempco resistors rated for ≥2W pulse power in the LTC1159CS#PBF design.
Does the LTC1159CS#PBF require external compensation components?
No - the LTC1159CS#PBF uses inherent constant off-time current-mode control, which provides unconditional stability without external Type-II or Type-III compensation networks. The ITH pin serves only as a gain amplifier decoupling point; a 0.1µF ceramic capacitor to SGND is sufficient. This eliminates loop-tuning complexity and makes the LTC1159CS#PBF robust across wide input/output ranges and inductor tolerances.
LTC1159CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1159CS#PBF FAQ
1.How can I place an order for LTC1159CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CS#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 LTC1159CS#PBF reliable?
The price and inventory of LTC1159CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1159CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1159CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CS#PBF?
LTC1159CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CS#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 LTC1159CS#PBF?
For technical support, including LTC1159CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CS#PBF requirements.
6.How does Aetrix verify that LTC1159CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CS#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 LTC1159CS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1159CS#PBF?
All LTC1159CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CS#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 LTC1159CS#PBF part is unused and in its original packaging.
Return procedure for LTC1159CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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