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Analog Devices Inc. LTC1159CS-3.3#TRPBF
- Part No.:
- LTC1159CS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1159CS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,578
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Product details
Overview
LTC1159CS-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 output current. It operates from 4V to 40V input, uses constant off-time current-mode control, supports Burst Mode™ for ultralow quiescent current (300µA in regulation, 20µA in shutdown), and drives external complementary P- and N-channel MOSFETs. It is used in battery-powered portable instruments and industrial power distribution systems requiring high efficiency across wide load ranges.
For engineers reviewing the LTC1159CS-3.3#TRPBF datasheet, LTC1159CS-3.3#TRPBF pinout, LTC1159CS-3.3#TRPBF application, or LTC1159CS-3.3#TRPBF equivalent, key selection criteria include its 3.3V fixed output, 4–40V input range, 20µA shutdown current, synchronous gate drive architecture, and SSOP-16 package compatibility with thermal resistance θJA = 110°C/W.
Technical Context
The LTC1159CS-3.3#TRPBF implements a constant off-time current-mode architecture with adaptive non-overlap gate drives, enabling excellent line and load transient response. Its internal 4.5V linear regulator powers control circuitry at startup, while EXTVCC allows driver supply derivation from the regulated output-improving efficiency at high input voltages.
Burst Mode operation activates below ~15% of maximum load current, reducing supply current to 300µA while maintaining regulation. The SENSE+ and SENSE− pins interface with an external current-sense resistor to set peak inductor current, and the CT pin sets operating frequency via an external capacitor (e.g., 390pF yields ~5µs off-time at 10V input).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.43V at 700mA, 25°C) |
| Input Voltage Range | 4V to 40V - supports wide industrial and battery-derived supplies |
| Efficiency | Up to 95% - enabled by synchronous FET switching and low-loss gate drives |
| Shutdown Current | 20µA - enables long battery life in standby mode |
| Operating Frequency | Set by CT capacitor; typical off-time 4–6µs - provides stable switching across input/output ratios |
| Current Sense Threshold | 130–170mV (high threshold) and 25mV (low threshold) - defines overcurrent protection and burst entry point |
| Thermal Resistance | θJA = 110°C/W (SSOP-16) - determines max power dissipation at ambient temperature |
Pinout & Package
Package: 16-lead plastic SO (SO-16), surface-mount, RoHS-compliant, JEDEC MS-012AC. Thermal pad not present; θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted gate drive output | Swings from VIN to VIN–VCC; drives P-channel MOSFET gate referenced to VIN |
| VIN | Main power input | Accepts 4V–40V supply; powers internal regulator and P-drive circuitry |
| VCC | Internal 4.5V regulator output | Supplies control logic and drivers; sourced either internally or via EXTVCC |
| P-DRIVE | High-current P-MOSFET gate driver | Swings VCC-to-ground; drives external P-FET gate through level-shifting network |
| CT | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT |
| ITH | Gain amplifier decoupling | Adjusts current comparator threshold; voltage increase raises current limit |
| SENSE− | Current sense reference / feedback node | Internally connected to fixed divider for 3.3V output; also (−) input of current comparator |
| SENSE+ | Current sense signal input | Compares against SENSE− to detect overcurrent; built-in offset enables precise trip setting |
| CAP | Charge compensation | Stabilizes P-gate level-shift capacitor during transitions; must exceed gate drive capacitance |
| SHDN2 | Master shutdown input | Logic-high (>1.4V) disables VCC and all circuitry; <0.8V enables normal operation |
| EXTVCC | External driver supply input | Allows VCC to be powered from regulated output, improving efficiency at high VIN |
| N-GATE | N-MOSFET gate driver | Swings ground-to-VCC; directly drives N-channel MOSFET gate |
| PGND | Power ground | Return path for N-FET source and CIN (–); must be separated from SGND |
| SGND | Small-signal ground | Return for feedback, sense, and control circuits; routed separately to COUT (–) |
| VFB | Feedback input | Not used in LTC1159CS-3.3#TRPBF - fixed-output variant ties internal divider to SENSE− |
| SHDN1 | Control-only shutdown | Disables control logic only (VCC remains active); must be grounded for normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Ensures stable ripple current in inductor and fast transient response without loop compensation |
| Burst Mode™ operation | Reduces quiescent current to 300µA under light loads while maintaining tight output regulation |
| Adaptive non-overlap gate drives | Prevents shoot-through by sequencing P- and N-gate transitions with built-in dead time |
| EXTVCC-powered driver supply | Enables >95% efficiency at high input voltages by sourcing gate drive from regulated output |
| Short-circuit protection with extended tOFF | Automatically lengthens off-time during overload to limit average short-circuit current to ~IMAX |
| Wide input voltage range (4V–40V) | Supports 12V/24V industrial rails and multi-cell battery inputs without external pre-regulation |
Applications
| Portable Instrument Power | Notebook System Rail |
|---|---|
Use Scenario: Powering microcontroller, ADC, and display subsystems in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Primary DC-DC controller generating clean 3.3V rail from 9–36V Li-ion or alkaline battery packs. Use Value: 95% peak efficiency and 20µA shutdown current extend battery runtime beyond 100 hours in sleep mode. |
Use Scenario: Generating core I/O voltage for embedded controllers in ruggedized notebook docking stations. IC Role / Device Role / Timing Role: Synchronous buck controller driving discrete MOSFETs to replace integrated POL modules. Use Value: Adjustable frequency via CT pin enables EMI optimization; SSOP-16 footprint fits constrained board areas. |
| Industrial Sensor Node | Avionics Power Distribution |
Use Scenario: Regulating 3.3V for wireless sensor transceivers and analog front-ends in factory automation nodes. IC Role / Device Role / Timing Role: High-efficiency, wide-input controller interfacing with isolated 24V DC bus and local energy storage. Use Value: –40°C to 85°C operating range and 125°C junction rating ensure reliability in uncontrolled enclosures. |
Use Scenario: Providing fault-tolerant 3.3V supply for flight control interface ICs in secondary avionics busses. IC Role / Device Role / Timing Role: Controller with robust short-circuit protection and line transient immunity per DO-160 Section 22. Use Value: >60dB line rejection and internal shutdown thresholds prevent false triggering during aircraft power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1159IS-3.3#TRPBF | Same functionality, but specified for –40°C to 85°C industrial temperature range (vs. 0°C to 70°C for LTC1159CS-3.3#TRPBF) | Required for extended-temperature deployments; identical pinout and electrical specs | Select when operating ambient exceeds 70°C or requires guaranteed performance down to –40°C |
| LTC1149CS-3.3#PBF | No EXTVCC pin; higher quiescent current (100µA vs. 300µA in regulation, 20µA shutdown same); no adaptive non-overlap drive | Lacks efficiency optimization at high VIN; suitable where simplicity outweighs 2–3% efficiency loss | Choose only if EXTVCC routing complexity is prohibitive and input voltage stays ≤24V |
Compared with LTC1159IS-3.3#TRPBF, the LTC1159CS-3.3#TRPBF offers lower cost and sufficient thermal margin for commercial environments, while LTC1149CS-3.3#PBF trades efficiency and gate drive sophistication for legacy design compatibility and reduced BOM count.
Availability
LTC1159CS-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and avionics power distribution requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC1159CS-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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for the LTC portfolio.
The LTC1159 series was designed as a high-efficiency synchronous buck controller family targeting battery-operated and wide-input industrial power systems where low quiescent current and robust transient response are critical.
FAQ
What is the output voltage tolerance of the LTC1159CS-3.3#TRPBF?
The LTC1159CS-3.3#TRPBF delivers a fixed 3.3V output with a guaranteed tolerance of ±3% (3.23V to 3.43V) at 700mA load and 25°C. Over temperature and line/load conditions, total variation remains within ±5% across the full operating range, as confirmed by the datasheet's VOUT specification table.
Does the LTC1159CS-3.3#TRPBF require an external feedback resistor divider?
No. The LTC1159CS-3.3#TRPBF is a fixed-output variant: its internal resistive divider connects directly to the SENSE− pin, eliminating the need for external resistors. The VFB pin is unused and should remain unconnected - unlike the adjustable LTC1159 version which requires an external divider.
How does the EXTVCC pin improve efficiency in the LTC1159CS-3.3#TRPBF?
The EXTVCC pin allows the LTC1159CS-3.3#TRPBF to power its gate drivers from the regulated 3.3V output instead of the higher VIN supply. This reduces driver switching losses significantly - especially at VIN >12V - contributing directly to the device's 95% peak efficiency and enabling high-efficiency operation across its full 4V–40V input range.
What is the minimum recommended output capacitor ESR for stable operation of the LTC1159CS-3.3#TRPBF?
The LTC1159CS-3.3#TRPBF requires the output capacitor's ESR to be less than twice the value of the current-sense resistor RSENSE (COUT ESR < 2 × RSENSE). For optimal stability and efficiency, the datasheet recommends matching ESR to RSENSE - e.g., with RSENSE = 0.05Ω, select COUT with ESR ≈ 0.05Ω.
Can the LTC1159CS-3.3#TRPBF drive standard-threshold MOSFETs?
Yes - but only when EXTVCC is supplied from an external ≥8V source. With EXTVCC tied to the 3.3V output, the LTC1159CS-3.3#TRPBF's VCC is ~4.5V, requiring logic-level MOSFETs (VGS(TH) < 2.5V). Standard-threshold devices (VGS(TH) ~4V) will not fully enhance unless EXTVCC is externally powered above 8V, as noted in the Applications Information section.
LTC1159CS-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1159CS-3.3#TRPBF FAQ
1.How can I place an order for LTC1159CS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CS-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 LTC1159CS-3.3#TRPBF reliable?
The price and inventory of LTC1159CS-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 LTC1159CS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159CS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CS-3.3#TRPBF?
LTC1159CS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CS-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 LTC1159CS-3.3#TRPBF?
For technical support, including LTC1159CS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1159CS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CS-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 LTC1159CS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159CS-3.3#TRPBF?
All LTC1159CS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CS-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 LTC1159CS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159CS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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