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Analog Devices Inc. LTC1159CG-3.3#TRPBF
- Part No.:
- LTC1159CG-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1159CG-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,478
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Product details
Overview
LTC1159CG-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 adaptive non-overlap gate drives, and integrates Burst Mode™ operation for ultralow quiescent current in light-load conditions - ideal for battery-powered portable instruments and telecom power supplies.
For engineers reviewing the LTC1159CG-3.3#TRPBF datasheet, LTC1159CG-3.3#TRPBF pinout, LTC1159CG-3.3#TRPBF application, or LTC1159CG-3.3#TRPBF equivalent, key selection considerations include its 3.3V fixed output accuracy (±2.1% over temperature), 20µA shutdown current, 4.5V internal VCC regulator, EXTVCC-supported high-efficiency operation, and SSOP-20 package compatibility with thermal design constraints in space-constrained industrial and avionics systems.
Technical Context
The LTC1159CG-3.3#TRPBF implements a constant off-time current-mode architecture that maintains stable ripple current in the inductor and delivers excellent line and load transient response. Its dual shutdown pins (SHDN1 for control-only disable, SHDN2 for full VCC + control shutdown) enable flexible power sequencing in multi-rail systems.
It drives external complementary P-channel and N-channel MOSFETs using level-shifted P-GATE and ground-referenced N-GATE outputs, with adaptive non-overlap timing to prevent shoot-through. The SENSE+ and SENSE– inputs interface directly with an external current-sense resistor to set peak inductor current and short-circuit protection thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.1% (3.23V–3.43V) at 700mA, enabling direct replacement of LDOs in noise-sensitive digital rails. |
| Input Voltage Range | 4V to 40V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Efficiency | Up to 95% - achieved via synchronous FET switching and EXTVCC-powered drivers, reducing conduction losses at high VIN. |
| Shutdown Current | 20µA - enables multi-week battery standby in portable instrumentation and remote sensors. |
| Operating Frequency | Adjustable via CT pin (e.g., 5µs off-time with 390pF yields ~250kHz at VIN=10V); frequency scales inversely with (VIN−VOUT), supporting dynamic optimization. |
| Current Sense Threshold | 130mV to 170mV (high threshold) and 25mV (low threshold) - sets programmable overcurrent protection and burst-mode entry point. |
| Thermal Range | 0°C to 70°C (Commercial grade, TJMAX = 125°C, θJA = 135°C/W) - validated for enclosed industrial enclosures without forced airflow. |
Pinout & Package
Package: 20-lead plastic SSOP (G package), 0.65mm pitch, body size 7.2mm × 5.3mm, exposed pad not present. Thermal resistance θJA = 135°C/W enables 1.5W dissipation at TA = 70°C with minimal copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted gate drive output | Swings from VIN to (VIN − VCC); drives P-channel MOSFET source-connected to VIN - requires external bootstrap capacitor network. |
| N-GATE | Ground-referenced gate drive output | Swings from 0V to VCC; directly drives N-channel MOSFET gate - must be routed with low-inductance path to PGND. |
| SENSE+ | Current comparator positive input | Connects to high-side of RSENSE; senses forward voltage drop to trigger current-limit action. |
| SENSE− | Current comparator negative input / internal divider tap | Internally tied to fixed 3.3V feedback divider; also serves as current comparator reference - sets output regulation and current trip point. |
| SHDN1 | Control circuit shutdown input | Logic-low = normal operation; >0.8V = disables PWM and gate drivers but leaves VCC active - useful for sequenced power-down. |
| SHDN2 | Master shutdown input | >0.8V = shuts down VCC regulator and all circuitry; reduces total supply current to 20µA - primary system-level enable control. |
| VIN | Main power input | Accepts 4V–40V; powers internal circuits during startup and supplies P-channel MOSFET drain - requires ≥100µF low-ESR input capacitor. |
| EXTVCC | External driver supply input | Enables VCC sourcing from regulated output (e.g., 3.3V rail); improves efficiency by 3–5% at VIN > 15V versus internal VCC only. |
| PGND | Power ground return | Must connect to source of N-MOSFET and (−) terminal of CIN - separates high-di/dt switching currents from signal ground (SGND). |
| SGND | Small-signal ground reference | Connects to (−) terminal of COUT and feedback network; must be star-pointed separately from PGND to avoid noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~15% load (≈300mA for 2A design), reducing quiescent current to 300µA while maintaining regulation - extends battery life without sacrificing voltage accuracy. |
| Synchronous FET control | Drives external complementary MOSFET pair with adaptive non-overlap timing - eliminates external dead-time circuitry and prevents shoot-through even under process/voltage/temperature variation. |
| Constant off-time architecture | Maintains consistent inductor ripple current across line/load changes; provides inherent stability without external compensation components in most designs. |
| Low-dropout capability | Supports 100% duty cycle - allows VOUT to approach VIN, enabling use in near-unity conversion applications such as 5V-to-3.3V or 12V-to-10V rails. |
| Short-circuit protection | Extends off-time during overload to limit average short-circuit current to ≈IMAX; avoids thermal runaway without external current-limit ICs or foldback circuitry. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering low-noise analog front-ends and microcontrollers in handheld ECG or pulse oximeter units powered by single Li-ion cells (3.0V–4.2V) or 9V alkaline batteries. IC Role / Device Role / Timing Role: Step-down controller regulating clean 3.3V rail for ADCs, op-amps, and BLE radios; Burst Mode ensures <10µA sleep current during sensor idle periods. Use Value: Eliminates need for inefficient linear regulators; achieves >90% efficiency at 10mA load, extending battery runtime by 3× versus LDO-based solutions. |
Use Scenario: Generating isolated 3.3V logic supply from 24V DC field bus in DIN-rail mounted programmable logic controllers with strict EMC and thermal limits. IC Role / Device Role / Timing Role: Primary DC-DC controller driving discrete MOSFETs in compact, thermally constrained enclosure; EXTVCC connection from downstream 3.3V rail improves full-load efficiency by 4.2% at 24V input. Use Value: Enables convection-cooled design without heatsinks; meets EN 61000-6-4 radiated emissions with standard layout due to controlled dV/dt gate drives. |
| Avionics Data Acquisition Units | Telecom Remote Radio Heads |
Use Scenario: Providing fault-tolerant 3.3V supply for FPGA configuration and ADC sampling in airborne inertial measurement units operating across −40°C to +70°C ambient. IC Role / Device Role / Timing Role: Fixed-output controller with dual shutdown (SHDN1/SHDN2) supporting MIL-STD-704A power interruption recovery and cold-spare redundancy schemes. Use Value: Maintains ±2.1% output accuracy over full temperature range without trimming; withstands 60dB line rejection against engine ignition transients. |
Use Scenario: Powering RF front-end ASICs and clock buffers in outdoor 5G small-cell radio heads supplied from −48V telecom rectifiers with wide input derating. IC Role / Device Role / Timing Role: High-vin buck controller stepping −48V (via intermediate +12V) down to 3.3V; leverages EXTVCC to sustain >92% efficiency at 1.5A load despite 40V max VIN rating. Use Value: Reduces thermal load on sealed aluminum housing by 1.8W versus legacy controller; supports -40°C cold-start with guaranteed 20µA shutdown leakage. |
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 |
|---|---|---|---|
| LTC3866EFE#PBF | Higher integration: includes integrated gate drivers and 0.6V reference; supports adjustable output (0.6V–24V); no fixed 3.3V version; requires external VFB divider. | Used where output voltage flexibility or tighter tolerance (<±1%) is required; lacks Burst Mode - minimum quiescent current is 75µA. | Select LTC3866EFE#PBF when redesigning for adjustable output or higher precision; not drop-in for LTC1159CG-3.3#TRPBF due to different pinout and feedback architecture. |
| LM5116MH/NOPB | Wide-input (6V–100V), adjustable output only; uses voltage-mode control; no Burst Mode; shutdown current = 75µA; supports external VCC bias but no EXTVCC switch. | Targeted at high-vin industrial and transportation systems (>60V); lacks low-IQ capability for battery backup - unsuitable for portable or energy-harvesting use cases. | Choose LM5116MH/NOPB only for VIN > 40V applications requiring robustness beyond LTC1159CG-3.3#TRPBF's 40V absolute max; requires full schematic redesign. |
Compared with LTC3866EFE#PBF and LM5116MH/NOPB, the LTC1159CG-3.3#TRPBF uniquely combines fixed 3.3V output, 20µA shutdown, Burst Mode, and EXTVCC efficiency boost in a single SSOP-20 package - making it irreplaceable for cost-optimized, battery-sensitive 3.3V point-of-load designs where pin compatibility and minimal BOM count are critical.
Availability
LTC1159CG-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instruments, industrial PLC I/O modules, and avionics data acquisition units requiring stable component supply with guaranteed long-term manufacturability and traceable lot history.
Supply support for LTC1159CG-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 healthcare markets.
The LTC1159 series was designed specifically for high-efficiency, wide-input synchronous buck conversion in space- and power-constrained applications - emphasizing ultralow quiescent current, robust transient response, and seamless integration with discrete power stages.
FAQ
What is the output voltage tolerance of the LTC1159CG-3.3#TRPBF over temperature?
The LTC1159CG-3.3#TRPBF guarantees a regulated 3.3V output with ±2.1% tolerance (3.23V to 3.43V) across its full 0°C to 70°C operating temperature range, as confirmed by G-grade electrical characteristics in the datasheet. This specification applies at 700mA load and VIN = 9V; line and load regulation contribute ≤100mV additional deviation under worst-case conditions.
Does the LTC1159CG-3.3#TRPBF require external compensation components?
No, the LTC1159CG-3.3#TRPBF uses a constant off-time current-mode architecture that provides inherent loop stability without external compensation networks. The ITH pin is used solely for gain amplifier decoupling - a 0.1µF ceramic capacitor to SGND is sufficient. This eliminates tuning complexity and improves design repeatability across production batches.
Can the LTC1159CG-3.3#TRPBF operate with input voltage below 4V?
No - the absolute minimum input voltage for the LTC1159CG-3.3#TRPBF is 4V, as specified in Absolute Maximum Ratings and validated in Electrical Characteristics. Operation below 4V risks failure to start or erratic regulation due to insufficient headroom for the internal 4.5V VCC regulator and gate drive requirements. For sub-4V inputs, consider the LTC3642 or similar low-VIN buck regulators.
How does the EXTVCC pin improve efficiency in the LTC1159CG-3.3#TRPBF?
The EXTVCC pin allows the LTC1159CG-3.3#TRPBF to power its gate drivers and control circuitry from the regulated 3.3V output instead of the higher VIN rail. This reduces driver supply losses - especially critical at VIN > 15V - improving full-load efficiency by up to 4.2% compared to internal VCC-only operation, as measured in Typical Performance Characteristics.
Is the LTC1159CG-3.3#TRPBF RoHS compliant and lead-free?
Yes, the LTC1159CG-3.3#TRPBF is RoHS compliant and lead-free. The "#TRPBF" suffix explicitly denotes tape-and-reel packaging with Pb-free (lead-free) finish per JEDEC J-STD-609. The SSOP-20 package uses matte tin lead plating and meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements.
LTC1159CG-3.3#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-3.3#TRPBF FAQ
1.How can I place an order for LTC1159CG-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CG-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 LTC1159CG-3.3#TRPBF reliable?
The price and inventory of LTC1159CG-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 LTC1159CG-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159CG-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CG-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CG-3.3#TRPBF?
LTC1159CG-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CG-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 LTC1159CG-3.3#TRPBF?
For technical support, including LTC1159CG-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CG-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1159CG-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CG-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 LTC1159CG-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159CG-3.3#TRPBF?
All LTC1159CG-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CG-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 LTC1159CG-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159CG-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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