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Analog Devices Inc. LTC1159CG#PBF
- Part No.:
- LTC1159CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1159CG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,028
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Product details
Overview
LTC1159CG#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 at 300µA standby current, supports 20µA shutdown, and features adaptive non-overlap gate drives for high-efficiency power conversion in battery-operated digital devices.
For engineers reviewing the LTC1159CG#PBF datasheet, LTC1159CG#PBF pinout, LTC1159CG#PBF application, or LTC1159CG#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load behavior, exact package mapping to 20-lead SSOP, and two rigorously cross-checked alternative controllers for fixed-output DC/DC designs.
Technical Context
The LTC1159CG#PBF implements a constant off-time current-mode control architecture with automatic Burst Mode™ operation below ~15% of maximum load current. It uses an external CT capacitor to set switching frequency and senses output current via differential SENSE+ and SENSE– pins with programmable thresholds (25mV low / 150mV high).
Its dual shutdown structure includes SHDN1 (control-only disable) and SHDN2 (full VCC + control shutdown), while EXTVCC enables driver power sourcing from the regulated output voltage-improving efficiency at high VIN. The P-GATE output is level-shifted (VIN to VIN–VCC), and N-GATE swings rail-to-rail (0V to VCC), supporting synchronous rectification with logic-level MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide industrial and telecom input rails without external pre-regulation |
| Efficiency | Up to 95% - achieved via synchronous FET switching and adaptive non-overlap timing |
| Shutdown Current | 20µA - enables ultra-low-power sleep in portable systems with long battery life |
| Feedback Voltage | 1.25V ±4% - precise reference for adjustable output configurations using external resistor divider |
| Current Sense Threshold | 25mV (low) / 150mV (high) - sets peak inductor current and short-circuit protection level |
| Off-Time | 4–6µs (CT = 390pF) - determines minimum on-time and governs light-load Burst Mode entry |
| Operating Temperature | 0°C to 70°C - commercial-grade thermal range suitable for notebook, instrumentation, and embedded applications |
Pinout & Package
Package: 20-lead plastic SSOP (G package), 0.65mm pitch, JEDEC MS-013AC compliant, θJA = 135°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted high-side gate drive output | Swings from VIN to VIN–VCC; drives P-channel MOSFET gate referenced to input rail |
| VIN | Main power supply input | Accepts 4V–40V; powers internal regulator and supplies energy to external high-side switch |
| VCC | Internal 4.5V linear regulator output | Supplies control circuitry and drivers during startup; overridden by EXTVCC in normal operation |
| P-DRIVE | High-current P-channel gate driver | Swings 0V to VCC; drives external P-MOSFET gate through level-shifting network |
| CT | Timing capacitor connection | External capacitor sets off-time and operating frequency; value scales inversely with f |
| ITH | Gain amplifier decoupling point | Adjusts current comparator threshold; higher voltage raises trip point for load tracking |
| SENSE– | Inverting input of current comparator & feedback node | Connects to internal resistive divider in fixed-output versions; sets output voltage and current sense reference |
| CAP | Charge compensation node | Stabilizes P-gate level-shift capacitor; requires capacitor > gate drive capacitance |
| SHDN2 | Master shutdown input | Logic-high (>1.4V) disables VCC and all control circuits; draws ≤20µA |
| SGND | Small-signal ground reference | Must be isolated from PGND and connected to COUT(–) to minimize noise coupling into feedback path |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces standby current to 300µA while maintaining regulation-critical for always-on portable systems |
| Synchronous FET switching | Eliminates external Schottky losses; enables >95% efficiency across 5mA–2A load range |
| Adaptive non-overlap gate drives | Prevents shoot-through by enforcing dead time between P-GATE and N-GATE transitions |
| EXTVCC-powered drivers | Derives gate drive power from regulated output-boosts efficiency by 3–5% at VIN > 20V |
| Very low dropout operation | Supports 100% duty cycle-enables operation down to VOUT ≈ VIN – 0.4V (e.g., 4.6V out from 5V in) |
Applications
| Portable Instrumentation Power | Notebook Computer Core Supply |
|---|---|
Use Scenario: Powering precision analog front-ends and microcontrollers in handheld multimeters and data loggers with 4.5–36V battery inputs. IC Role / Device Role / Timing Role: Step-down controller regulating stable 3.3V or 5V from variable battery voltage while minimizing quiescent draw. Use Value: 20µA shutdown current extends battery life beyond 1 year in sleep mode; Burst Mode maintains <15mV ripple at µA loads. |
Use Scenario: Generating 5V/2A core voltage for Intel Pentium-class CPUs in early notebook platforms with 12–24V adapter inputs. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller interfacing with discrete P/N-MOSFET pairs and ceramic output capacitors. Use Value: 95% peak efficiency reduces thermal load on compact PCBs; CT-programmable frequency avoids EMI-sensitive bands. |
| Industrial Distributed Power | Avionics DC-DC Conversion |
Use Scenario: Local 5V regulation from 24V or 48V chassis rails in PLC I/O modules and sensor transmitters. IC Role / Device Role / Timing Role: Robust controller with short-circuit protection and line transient immunity for unregulated industrial bus inputs. Use Value: Withstands –15V to 60V absolute max input; 60dB line rejection suppresses noise from motor drives and solenoid switching. |
Use Scenario: Converting 28V aircraft bus to 5V for flight control interface electronics requiring high reliability and low EMI. IC Role / Device Role / Timing Role: Constant off-time controller delivering fast load transient response (<10µs recovery) and deterministic Burst Mode entry. Use Value: 125°C junction rating and 0°C–70°C ambient range meet DO-160 environmental stress requirements; no external compensation needed. |
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 pin; higher 100µA shutdown current; same 20-lead SO package | Lacks output-derived gate drive-less efficient above 20V input; suited for cost-sensitive 12V systems | Select when EXTVCC efficiency gain is unnecessary and legacy layout reuse is prioritized |
| TPS54202DRCT | Integrated FETs (not external); 4.5–28V input; 2A max; 2.5µA IQ in Eco-mode | Monolithic solution eliminates external MOSFET layout complexity but limits max VIN and thermal scalability | Choose for space-constrained designs where 28V max input and integrated FETs outweigh flexibility needs |
Compared with LTC1159CG#PBF, LTC1149CS#PBF trades efficiency at high VIN for pin compatibility and lower cost, while TPS54202DRCT replaces external MOSFET flexibility with integration and ultra-low quiescent current-making each suitable for distinct trade-off priorities in industrial or portable power design.
Availability
LTC1159CG#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and industrial distributed power applications requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC1159CG#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 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC family.
The LTC1159CG#PBF belongs to Linear's high-efficiency synchronous buck controller product line, designed specifically for external MOSFET-based DC/DC conversion in battery-powered and wide-input industrial systems where efficiency, light-load performance, and thermal robustness are critical.
FAQ
What is the function of the EXTVCC pin on the LTC1159CG#PBF?
The EXTVCC pin on the LTC1159CG#PBF allows the internal gate drivers and control circuitry to be powered from the regulated output voltage instead of the internal 4.5V VCC regulator. When enabled, this configuration improves overall efficiency-especially at high input voltages-by reducing power dissipation in the VCC LDO. The internal PNP switch connects EXTVCC to VCC only when EXTVCC exceeds VCC by ≥250mV, and the LTC1159CG#PBF automatically selects the higher of the two sources.
Does the LTC1159CG#PBF support fixed-output voltage configurations?
Yes, the LTC1159CG#PBF is the adjustable version, but it is part of a family that includes fixed-output variants: LTC1159CG-3.3#PBF (3.3V) and LTC1159CG-5#PBF (5V). In fixed versions, the SENSE– pin connects internally to a precision resistive divider, eliminating the need for external feedback resistors. The LTC1159CG#PBF itself requires an external resistor divider from VOUT to SGND with the midpoint connected to VFB to set the output voltage.
What is the maximum recommended output current for the LTC1159CG#PBF?
The LTC1159CG#PBF does not define a hard maximum output current-it is determined by external components: RSENSE, MOSFET RDS(ON), inductor saturation current, and thermal management. Typical validated designs deliver 2A continuous (e.g., Figure 1 in datasheet). Peak short-circuit current is set by RSENSE (ISC(PK) ≈ 150mV/RSENSE), and burst mode initiates near IBURST ≈ 15mV/RSENSE. For 2A operation, RSENSE = 0.05Ω yields ISC(PK) = 3A and IBURST = 300mA.
How does the LTC1159CG#PBF achieve high efficiency at light loads?
The LTC1159CG#PBF achieves high light-load efficiency through automatic Burst Mode™ operation, which disables switching and places the controller in a low-power sleep state (300µA supply current) while maintaining output regulation. During Burst Mode, the output capacitor supplies load current until voltage drops below hysteresis threshold, triggering a brief burst of switching cycles to recharge COUT. This eliminates continuous switching losses and keeps efficiency >85% even at 10mA load-unlike forced PWM controllers.
Can the LTC1159CG#PBF be used in inverting buck-boost configurations?
Yes, the LTC1159CG#PBF supports inverting buck-boost topologies per Linear's Application Note 69. In this configuration, the P-channel MOSFET switches the input to ground, the N-channel MOSFET connects the inductor to the negative output rail, and the SENSE+ and SENSE– pins monitor current in the inductor return path. The feedback loop remains connected to the negative output via an inverted resistive divider, and the LTC1159CG#PBF's current-mode architecture ensures stable operation with appropriate compensation.
LTC1159CG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 20-SSOP
LTC1159CG#PBF FAQ
1.How can I place an order for LTC1159CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CG#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 LTC1159CG#PBF reliable?
The price and inventory of LTC1159CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1159CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1159CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CG#PBF?
LTC1159CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CG#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 LTC1159CG#PBF?
For technical support, including LTC1159CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CG#PBF requirements.
6.How does Aetrix verify that LTC1159CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CG#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 LTC1159CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1159CG#PBF?
All LTC1159CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CG#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 LTC1159CG#PBF part is unused and in its original packaging.
Return procedure for LTC1159CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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