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Analog Devices Inc. LTC1159CG#TRPBF
- Part No.:
- LTC1159CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1159CG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
LTC1159CG#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 95% efficiency, maintains regulation down to 20µA shutdown current, and supports user-programmable output current via external sense resistor - used in battery-powered industrial power supplies requiring high light-load efficiency.
For engineers reviewing the LTC1159CG#TRPBF datasheet, LTC1159CG#TRPBF pinout, LTC1159CG#TRPBF application, or LTC1159CG#TRPBF equivalent, key selection criteria include its 20-lead SSOP package, Burst Mode™ operation below ~15% load, adaptive non-overlap gate drives, EXTVCC-powered driver architecture for high-VIN efficiency, and fixed 3.3V/5V variants versus adjustable VFB version.
Technical Context
The LTC1159CG#TRPBF implements a constant off-time current-mode control architecture with internal 4.5V LDO and an EXTVCC switch enabling driver power sourcing from the regulated output - reducing quiescent loss at high input voltages. Its dual shutdown pins (SHDN1 for control-only disable, SHDN2 for full system shutdown) support hierarchical power sequencing.
It features programmable off-time via CT pin (3.5–6.5µs typical), dual current-sense thresholds (25mV low / 130–170mV high), and built-in adaptive non-overlap logic preventing shoot-through between P-GATE and N-GATE outputs. The SENSE+ and SENSE− inputs interface directly with an external shunt resistor to set peak inductor current and short-circuit protection level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide-input industrial and telecom rails without external pre-regulation. |
| Efficiency (Typical) | Up to 95% - achieved via synchronous FET switching and EXTVCC-driven gate drivers minimizing driver losses. |
| Shutdown Current | 20µA - enables ultra-low-power standby in portable instrumentation and remote sensors. |
| Operating Frequency | Up to 250kHz - set by CT capacitor; off-time varies with VOUT/VIN ratio to maintain stable ripple current. |
| Current Sense Threshold | 25mV (low) / 130–170mV (high) - defines overcurrent trip and short-circuit foldback behavior with ±2mV offset tolerance. |
| Feedback Voltage (Adjustable) | 1.21–1.29V - sets output voltage via external resistor divider on VFB pin; not applicable to LTC1159CG-3.3/LTC1159CG-5 variants. |
| Package | 20-lead plastic SSOP - thermally enhanced surface-mount package with θJA = 135°C/W for convection-cooled PCBs. |
Pinout & Package
Package: 20-lead plastic SSOP (G package), JEDEC MS-013AC, body size 7.5mm × 5.3mm, 0.65mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted high-side gate drive output | Swings from VIN to VIN − VCC (≈4.5V); drives P-channel MOSFET source-referenced gate. |
| VIN | Main power input | Accepts 4–40V supply; powers internal LDO and feeds high-side switch; absolute max −15V to 60V. |
| VCC | Internal 4.5V regulator output | Supplies control circuitry and gate drivers; sourced from internal LDO or EXTVCC switch (whichever is higher). |
| P-DRIVE | High-current P-MOSFET gate driver | Swings 0V to VCC; drives gate of P-channel MOSFET through external level-shifting network. |
| CT | Timing capacitor connection | Sets off-time (3.5–6.5µs typ); frequency scales inversely with CT and depends on VOUT/VIN ratio. |
| ITH | Gain amplifier decoupling node | Controls current comparator threshold; voltage increase raises trip point for load-current tracking. |
| SENSE− | Inverting input of current comparator / internal divider tap | Connects to shunt resistor low side; also sets fixed output (3.3V/5V) via internal resistor ladder. |
| CAP | Charge compensation for P-GATE level shift | Stabilizes P-GATE drive during transients; requires capacitor ≥ gate drive capacitor value. |
| SHDN2 | Master shutdown input | Logic-high (>1.4V) disables VCC regulator and all circuitry; draws ≤20µA when asserted. |
| EXTVCC | External driver supply input | Enables higher-efficiency operation by powering drivers from regulated output instead of VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~15% load to reduce quiescent current to 300µA while maintaining regulation. |
| Adaptive non-overlap gate drives | Hardware-enforced dead time prevents shoot-through between P-GATE and N-GATE outputs. |
| EXTVCC-powered driver architecture | Switches driver supply from internal LDO to regulated output, improving efficiency by >3% at VIN > 20V. |
| Constant off-time current-mode control | Maintains stable inductor ripple current across line/load variations, ensuring fast transient response. |
| Dual shutdown control (SHDN1/SHDN2) | SHDN1 disables only control logic (VCC remains active); SHDN2 cuts all power - enables flexible sequencing. |
Applications
| Industrial Power Distribution | Notebook Computer Power Rails |
|---|---|
|
Use Scenario: Distributed 5V/3.3V point-of-load conversion in programmable logic controllers with 24V DC input bus. IC Role / Device Role / Timing Role: Controller for synchronous buck stage driving Si9435DY/Si9410DY MOSFET pair; regulates output under dynamic load steps. Use Value: Maintains >92% efficiency at 100mA–2A loads and 20µA shutdown current extends system standby life. |
Use Scenario: Main 5V system rail generation from 12V battery or adapter in ultraportable notebooks. IC Role / Device Role / Timing Role: Constant off-time controller managing burst-mode transitions during CPU sleep states. Use Value: Reduces no-load input current to 300µA, extending battery runtime during idle without compromising transient response. |
| Avionics Power Conditioning | Portable Test Instruments |
|
Use Scenario: 28V-to-5V conversion in airborne data acquisition modules requiring MIL-STD-704 compliance. IC Role / Device Role / Timing Role: High-line-rejection (60dB+) controller handling ±5V line transients while regulating tightly. Use Value: Delivers <±40mV load regulation over 5–2A range and withstands rapid VIN slew rates up to 0.5V/µs with diode clamp. |
Use Scenario: Battery-powered handheld oscilloscope with dual 3.3V/5V rails for analog front-end and digital core. IC Role / Device Role / Timing Role: Adjustable-output controller (LTC1159 variant) setting precise 3.3V via VFB divider for ADC reference stability. Use Value: Achieves 1.25V ±1% internal reference and <1.3% output voltage accuracy over temperature for metrology-grade performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Wider VIN range (4–60V), integrated gate drivers, no EXTVCC option, higher quiescent current (55µA shutdown) | Supports higher input voltages and eliminates external driver biasing complexity but lacks Burst Mode efficiency optimization below 100mA | Select when input exceeds 40V or board space constraints require integrated drivers; avoid when sub-100µA shutdown is required. |
| LM5116MH/NOPB | 4.5–100V input, current-mode with slope compensation, no Burst Mode, 100µA shutdown, SOIC-20 package | Designed for high-VIN industrial converters; lacks light-load efficiency optimization and EXTVCC architecture | Prefer for 48V telecom or automotive applications where input >40V dominates; not suitable for battery-operated devices needing <1mA light-load current. |
Compared with LTC1159CG#TRPBF, LTC3891EMSE#PBF offers higher input voltage tolerance and integration but sacrifices sub-mA light-load efficiency, while LM5116MH/NOPB targets high-VIN robustness at the cost of Burst Mode capability and ultra-low shutdown current - making LTC1159CG#TRPBF uniquely suited for wide-input, battery-sensitive applications demanding both high efficiency and deep sleep.
Availability
LTC1159CG#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, avionics conditioning, and portable test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1159CG#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 legacy Linear parts including the LTC series.
The LTC1159CG#TRPBF belongs to Linear's high-efficiency synchronous buck controller family designed specifically for wide-input, low-quiescent-current DC/DC conversion in portable, industrial, and aerospace systems.
FAQ
What is the operating temperature range for the LTC1159CG#TRPBF?
The LTC1159CG#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade), with junction temperature limited to 125°C. Its thermal resistance is θJA = 135°C/W in the 20-lead SSOP package, requiring appropriate copper pour and airflow for full-load operation at elevated ambient temperatures. Derating curves in the datasheet define maximum continuous output current versus temperature.
Does the LTC1159CG#TRPBF support fixed-output voltage configurations?
Yes - the LTC1159CG#TRPBF is the base part number for the adjustable-output version, but Analog Devices manufactures pin-compatible fixed-output variants: LTC1159CG-3.3#TRPBF (3.3V ±3%) and LTC1159CG-5#TRPBF (5.05V ±3%). These use internal feedback dividers tied to SENSE−, eliminating the need for external resistors while retaining identical pinout and control features.
How does the EXTVCC pin improve efficiency in the LTC1159CG#TRPBF?
The EXTVCC pin allows the LTC1159CG#TRPBF to power its gate drivers from the regulated output voltage instead of the higher VIN rail. This reduces driver supply voltage difference (e.g., from 40V–4.5V to 5V–4.5V), cutting driver switching losses significantly - especially critical above 20V input, where efficiency gains exceed 3% compared to internal-LDO-only operation.
What protection features are integrated into the LTC1159CG#TRPBF?
The LTC1159CG#TRPBF integrates short-circuit protection via current-sense threshold detection, adaptive non-overlap logic to prevent shoot-through, and thermal shutdown at 125°C junction temperature. It also provides undervoltage lockout on VCC and robust ESD tolerance (±2kV HBM). No external fault latching or retry circuitry is required for basic overcurrent events.
Can the LTC1159CG#TRPBF be used with standard-threshold MOSFETs?
Yes - when EXTVCC is driven from an external 8–12V supply (not the output), the LTC1159CG#TRPBF can drive standard-threshold P- and N-channel MOSFETs (VGS(th) < 4V). However, most designs use logic-level MOSFETs due to the typical 4.5V VCC level; standard MOSFETs require careful gate drive design and are recommended only for VIN > 30V applications where logic-level devices lack sufficient BVDSS rating.
LTC1159CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 20-SSOP
LTC1159CG#TRPBF FAQ
1.How can I place an order for LTC1159CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CG#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 LTC1159CG#TRPBF reliable?
The price and inventory of LTC1159CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1159CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CG#TRPBF?
LTC1159CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CG#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 LTC1159CG#TRPBF?
For technical support, including LTC1159CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CG#TRPBF requirements.
6.How does Aetrix verify that LTC1159CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CG#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 LTC1159CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159CG#TRPBF?
All LTC1159CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CG#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 LTC1159CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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