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Analog Devices Inc. LTC1159CS#TRPBF
- Part No.:
- LTC1159CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1159CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,428
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Product details
Overview
LTC1159CS#TRPBF 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 2A output with fixed 5V regulation (LTC1159CS-5 variant), achieves up to 95% efficiency, and features adaptive non-overlap gate drives for high-efficiency power conversion in portable industrial systems.
For engineers reviewing the LTC1159CS#TRPBF datasheet, LTC1159CS#TRPBF pinout, LTC1159CS#TRPBF application, or LTC1159CS#TRPBF equivalent, key selection considerations include its 16-pin SO package, 5V fixed-output version, 20µA shutdown current, Burst Mode™ operation below ~15% load, and EXTVCC-powered driver architecture enabling high efficiency at elevated input voltages.
Technical Context
The LTC1159CS#TRPBF implements a constant off-time current-mode control architecture with programmable timing via CT pin, maintaining stable ripple current and delivering excellent line/load transient response. Its dual shutdown pins (SHDN1 for control-only disable, SHDN2 for full VCC + control shutdown) support flexible power sequencing.
It integrates a 4.5V internal LDO for startup and enables driver power sourcing from regulated output via EXTVCC pin-reducing quiescent loss and improving efficiency above 12V input. The P-GATE level-shifted drive (VIN to VIN–VCC) and N-GATE ground-referenced drive (0V to VCC) are optimized for logic-level MOSFETs with RDS(ON) < 50mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide-input industrial and telecom supplies without external pre-regulation. |
| Output Voltage | Fixed 5.05V (typ) - tightly regulated ±2% over load/line/temperature; no external feedback divider required. |
| Max Output Current | 2A - determined by external RSENSE = 0.05Ω and peak current threshold of 150mV. |
| Efficiency | Up to 95% - achieved via synchronous FET switching, adaptive non-overlap timing, and EXTVCC-driven drivers. |
| Shutdown Current | 20µA - enables ultra-low-power standby in battery-backed systems. |
| Operating Frequency | ~250kHz (max) - set by CT capacitor; off-time scales with VOUT/VIN ratio for stable regulation across input range. |
| Burst Mode Threshold | ~15% of max load (~300mA) - automatically engages to maintain >80% efficiency down to light loads. |
Pinout & Package
Package: 16-lead plastic SO (Small Outline) per JEDEC MS-012, θJA = 110°C/W, RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted top P-MOSFET gate drive | Swings from VIN to VIN–VCC; requires external bootstrap capacitor for high-side conduction. |
| VIN | Main power input | Accepts 4V–40V; powers internal regulator and provides source for P-MOSFET. |
| VCC | Internal 4.5V LDO output | Supplies control circuitry and drivers during startup; bypass with ≥1µF ceramic near pin. |
| P-DRIVE | High-current P-MOSFET gate driver | Drives P-MOSFET gate via external resistor; referenced to VCC (0V to VCC swing). |
| CT | Timing capacitor connection | External capacitor sets off-time; value determines operating frequency and load transient behavior. |
| ITH | Current comparator threshold control | DC voltage modulates current sense threshold; used for gain compensation and soft-start. |
| SENSE– | Current sense reference / fixed-output feedback | Internally connected to 5.05V divider; serves as inverting input for current comparator. |
| CAP | Charge compensation node | Stabilizes P-GATE level-shifter; requires ≥0.15µF capacitor to VCC to prevent shoot-through. |
| SHDN2 | Master shutdown input | Logic-high (>1.4V) disables VCC regulator and all drivers; pulls total supply current to 20µA. |
| EXTVCC | External driver supply input | Enables powering drivers from regulated output (e.g., 5V) - improves efficiency at high VIN. |
| N-GATE | N-MOSFET gate driver output | Ground-referenced (0V to VCC); directly drives low-side MOSFET gate with fast 100ns transition. |
| PGND | Power ground return | Must connect to source of N-MOSFET and negative terminal of CIN; separate from SGND. |
| SGND | Small-signal ground | Return for feedback, sense, and control circuits; routed separately to COUT(–) to avoid noise coupling. |
| SENSE+ | Current sense positive input | Connects across RSENSE; compares against SENSE– to detect overcurrent and regulate peak inductor current. |
| SHDN1 | Control-only shutdown | Logic-high disables PWM and gate drivers but leaves VCC active - useful for controlled soft-stop. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET control | Eliminates external Schottky losses; enables >95% efficiency with matched P/N MOSFET pair. |
| Burst Mode™ operation | Maintains >80% efficiency at loads as low as 300mA while reducing quiescent current to 300µA. |
| Adaptive non-overlap gate drives | Prevents shoot-through by dynamically adjusting dead time between P-GATE and N-GATE transitions. |
| EXTVCC-powered drivers | Reduces driver losses by 40–60% at VIN > 15V versus internal VCC-only operation. |
| Short-circuit protection | Extends off-time during overload to limit average short-circuit current to ~2A without latch-off. |
| Very low dropout capability | Supports 100% duty cycle - enables operation down to VIN – VOUT = 0.4V (e.g., 5.4V→5V). |
Applications
| Portable Medical Instrumentation | Industrial Sensor Node Power |
|---|---|
Use Scenario: Battery-powered handheld blood glucose meter requiring stable 5V rail from 7.2V Li-ion pack with minimal self-discharge during 6-month shelf life. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating 5V output; manages burst-mode entry/exit based on microcontroller sleep/wake cycles. Use Value: 20µA shutdown current extends battery shelf life; synchronous topology avoids heat buildup in sealed enclosure. |
Use Scenario: Remote vibration sensor node powered by 24V industrial bus, needing isolated 5V for MCU and analog front-end with EMI resilience. IC Role / Device Role / Timing Role: High-input-voltage step-down controller; EXTVCC pin powered from local 5V rail to minimize input current ripple. Use Value: 40V absolute max rating tolerates 24V bus transients; constant off-time architecture ensures fast load transient recovery during sensor sampling bursts. |
| Avionics Power Distribution | Telecom Line Card Supply |
Use Scenario: 28V aircraft power system supplying 5V to flight data recorder interface ICs with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Primary buck controller in redundant power path; SHDN2 enables coordinated shutdown during fault isolation. Use Value: 125°C junction rating and -40°C to 85°C operating range meet DO-160 environmental specs; short-circuit foldback prevents cascading failures. |
Use Scenario: 48V telecom backplane powering 5V FPGA I/O banks with tight ripple (<50mVP-P) and fast transient response. IC Role / Device Role / Timing Role: Secondary point-of-load regulator; CT pin tuned for 200kHz operation to avoid AM radio band interference. Use Value: Current-mode control delivers <10µs recovery from 1A load steps; low ESR COUT requirement simplifies layout in dense line card space. |
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 |
|---|---|---|---|
| LTC3866EMSE#PBF | Higher integration: integrated MOSFET drivers + current sensing; supports 4.5V–60V input; no EXTVCC pin. | Requires fewer external components but lacks EXTVCC efficiency optimization at high VIN. | Select when board space is constrained and input voltage stays ≤36V; not drop-in due to different pinout and control loop design. |
| LM5116MH/NOPB | Wide-input (6V–100V), current-mode controller with adjustable frequency; no Burst Mode; higher 1.5mA quiescent current. | Better suited for high-VIN industrial supplies where light-load efficiency is secondary to ruggedness. | Choose for 48V/72V bus applications with >1A continuous load; requires redesign of feedback and current sense network. |
Compared with LTC1159CS#TRPBF, LTC3866 offers higher integration but forfeits EXTVCC-driven efficiency gains above 24V, while LM5116 trades ultra-low quiescent current for wider VIN range and no burst-mode light-load optimization - making LTC1159CS#TRPBF optimal for 5V/2A portable and avionics designs demanding sub-30µA shutdown and 95% peak efficiency.
Availability
LTC1159CS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, avionics power distribution, and telecom line card supplies requiring stable component supply with long lifecycle visibility and traceable sourcing.
Supply support for LTC1159CS#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 precision, industrial, automotive, and communications markets.
The LTC1159 series belongs to Linear's legacy high-efficiency DC/DC controller product line, specifically engineered for synchronous buck conversion in battery-powered and wide-input industrial systems where ultra-low quiescent current and Burst Mode™ efficiency preservation are critical.
FAQ
What is the operating temperature range for the LTC1159CS#TRPBF?
The LTC1159CS#TRPBF is specified for operation from –40°C to +85°C ambient temperature (industrial grade). Its maximum junction temperature is 125°C, and thermal resistance θJA is 110°C/W in the 16-lead SO package. Derating is required above 70°C ambient for continuous 2A operation - consult the thermal performance curves in the official datasheet for layout-dependent derating guidance.
Does the LTC1159CS#TRPBF require an external current sense resistor?
Yes, the LTC1159CS#TRPBF requires an external current sense resistor (RSENSE) connected between SENSE+ and SENSE– pins. For the LTC1159CS-5 variant, a typical value is 0.05Ω to support 2A output with 150mV current threshold. The resistor sets both peak inductor current and short-circuit protection level - values from 0.02Ω to 0.2Ω are supported per the datasheet.
How does the EXTVCC pin improve efficiency in the LTC1159CS#TRPBF?
The EXTVCC pin allows the LTC1159CS#TRPBF to power its gate drivers from the regulated 5V output instead of the higher VIN supply. This reduces driver power dissipation significantly - especially at VIN > 15V - because driver current flows at lower voltage. In practice, this improves full-load efficiency by 3–5% and maintains >90% efficiency down to 12V input, unlike internal-VCC-only controllers.
Can the LTC1159CS#TRPBF be used with standard-threshold MOSFETs?
Yes - but only when EXTVCC is supplied from an external ≥8V source. The LTC1159CS#TRPBF's internal VCC regulator outputs 4.5V, which is sufficient for logic-level MOSFETs (VGS(TH) < 2.5V). Standard-threshold devices (VGS(TH) ≈ 3–4V) require higher gate drive voltage; using EXTVCC = 12V enables reliable turn-on of such MOSFETs while preserving high efficiency at elevated input voltages.
What is the function of the CAP pin on the LTC1159CS#TRPBF?
The CAP pin on the LTC1159CS#TRPBF provides charge compensation for the internal P-GATE level-shifter capacitor. A minimum 0.15µF ceramic capacitor must be placed between CAP and VCC to ensure stable high-side gate drive and prevent shoot-through during switching transitions. Omitting or undersizing this capacitor causes erratic P-MOSFET turn-off and potential device failure under load.
LTC1159CS#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#TRPBF FAQ
1.How can I place an order for LTC1159CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CS#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#TRPBF reliable?
The price and inventory of LTC1159CS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CS#TRPBF?
LTC1159CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CS#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#TRPBF?
For technical support, including LTC1159CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CS#TRPBF requirements.
6.How does Aetrix verify that LTC1159CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159CS#TRPBF?
All LTC1159CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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