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Analog Devices Inc. LTC1159IS-5#TRPBF
- Part No.:
- LTC1159IS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1159IS-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,984
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Product details
Overview
LTC1159IS-5#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller optimized for fixed 5V output, operating from 4V to 40V input. It delivers up to 2A output current with ultrahigh efficiency (up to 95%), 20µA shutdown current, and constant off-time current-mode control. It drives external complementary P- and N-channel MOSFETs in notebook computers and battery-powered industrial systems.
For engineers reviewing the LTC1159IS-5#TRPBF datasheet, LTC1159IS-5#TRPBF pinout, LTC1159IS-5#TRPBF application, or LTC1159IS-5#TRPBF equivalent, key selection criteria include its fixed 5V output accuracy (±2.1% over load/line/temp), Burst Mode™ operation below ~15% load, adaptive non-overlap gate drives, EXTVCC-supported high-voltage efficiency, and SO-16 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The LTC1159IS-5#TRPBF implements a constant off-time current-mode architecture with internal 1.25V reference and fixed-resistor feedback network tied to SENSE–, eliminating need for external VFB divider. Its P-gate drive is level-shifted from VIN, while N-gate is ground-referenced - enabling synchronous rectification without external bootstrap circuitry.
It integrates an internal 4.5V low-dropout linear regulator for startup, then seamlessly transitions driver power to the regulated output via EXTVCC pin, reducing quiescent loss at high input voltages. Shutdown is controlled independently by SHDN1 (control-only disable) and SHDN2 (full VCC + control disable), with validated thresholds of 0.5–2V and 0.8–2V respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.90V–5.20V over load/line/temp), enabling direct 5V rail generation without feedback resistor network. |
| Input Voltage Range | 4V to 40V continuous - supports wide-input industrial, avionics, and telecom power supplies without pre-regulation. |
| Efficiency | Up to 95% at full load; maintains >85% efficiency down to ~100mA due to Burst Mode™ and synchronous FET control. |
| Shutdown Current | 20µA max (VIN = 40V, SHDN2 = 2V) - critical for battery longevity in portable instruments and remote sensors. |
| Operating Temperature | –40°C to +85°C (I-grade), qualified per industrial reliability standards with θJA = 110°C/W in SO-16 package. |
| Current Sense Threshold | 130–170mV high threshold (forced), 25mV low threshold - sets peak inductor current and short-circuit protection point (ISC(PK) ≈ 150mV/RSENSE). |
| Off-Time | 3.5–6.5µs (CT = 390pF, VIN = 10V, ILOAD = 700mA) - determines minimum on-time and enables stable operation at high VIN/VOUT ratios. |
Pinout & Package
Package: 16-lead plastic SO (Small Outline) - RoHS-compliant, surface-mountable, with θJA = 110°C/W thermal performance suitable for convection-cooled industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted high-side gate drive output | Swings from VIN to VIN – VCC (≈ VIN – 4.5V); directly drives P-channel MOSFET gate without external level shifter. |
| VIN | Main power input | Accepts 4V–40V; powers internal LDO during startup and supplies energy to external high-side switch. |
| VCC | Internal 4.5V regulator output | Supplies control logic and gate drivers during startup; superseded by EXTVCC in normal operation for higher efficiency. |
| P-DRIVE | High-current P-MOSFET gate driver | Swings 0V to VCC; sources/sinks >50mA to rapidly charge/discharge P-FET gate capacitance. |
| CT | Timing capacitor connection | External capacitor (e.g., 390pF) sets off-time and thus operating frequency; frequency varies inversely with CT and (VIN – VOUT)/VIN ratio. |
| ITH | Gain amplifier decoupling node | Connects to RC network that adjusts current comparator threshold dynamically with load - stabilizes loop under transient conditions. |
| SENSE– | Fixed-output voltage sense / current comparator (–) input | Internally biased to set 5V output; also serves as low-side current sense reference - eliminates need for external divider. |
| CAP | Charge compensation for P-gate level shift | Requires capacitor to VCC (≥0.1µF) to supply charge during P-gate transitions; prevents VCC droop and ensures reliable high-side switching. |
| SHDN2 | Master shutdown input | Logic-high (>0.8V) disables VCC regulator and all control circuits; draws only 12–20µA - enables low-power system-level sleep modes. |
| SGND | Small-signal ground reference | Must be routed separately from PGND to COUT(–); isolates noise-sensitive analog circuitry from high-current switching paths. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~15% load (e.g., <300mA for 2A design), reducing quiescent current to 300µA while maintaining regulation - extends battery life in standby. |
| Synchronous FET control | Drives both P-channel high-side and N-channel low-side MOSFETs with adaptive non-overlap timing - eliminates body-diode conduction loss and boosts efficiency >3% vs diode-based designs. |
| EXTVCC power routing | Internal PNP switch allows VCC to be powered from regulated output (not VIN) during normal operation - cuts driver losses by ~40% at VIN = 36V, improving full-load efficiency. |
| Short-circuit protection | Automatic tOFF extension during overload limits average short-circuit current to ~IMAX - prevents MOSFET thermal runaway without external current-limit circuitry. |
| Very low dropout | Supports 100% duty cycle operation - enables regulation down to VIN – VOUT ≈ 0.4V, critical for low-voltage-drop applications like post-regulation of 5.5V rails. |
Applications
| Notebook Power Management | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Step-down conversion from 12V or 24V battery/bus to stable 5V for CPU core logic, USB peripherals, and display interface ICs in ruggedized field laptops. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing power sequencing, load transient response, and deep-sleep mode entry/exit. Use Value: 95% peak efficiency and 20µA shutdown current extend runtime between charges; Burst Mode™ maintains regulation during idle without wake-up latency. |
Use Scenario: Powering low-power microcontrollers, RS-485 transceivers, and analog sensor signal chains in distributed IIoT nodes powered by 24V industrial bus or LiFePO₄ batteries. IC Role / Device Role / Timing Role: Fixed-output DC-DC controller delivering clean, regulated 5V with high line rejection (>60dB) against noisy factory floor supply transients. Use Value: –40°C to +85°C operation ensures reliability in uncontrolled environments; EXTVCC efficiency boost reduces thermal stress on PCB in sealed enclosures. |
| Avionics Subsystem Rail | Telecom Line Card Bias Supply |
|
Use Scenario: Generating 5V bias for flight control interface modules, inertial measurement units (IMUs), and CAN transceivers from 28V aircraft bus with strict EMI and transient immunity requirements. IC Role / Device Role / Timing Role: High-reliability synchronous controller with integrated short-circuit protection and robust gate drive timing to withstand MIL-STD-704 voltage sags/spikes. Use Value: Constant off-time architecture provides excellent line transient response (<10µs recovery); P-gate level shift eliminates external high-side driver ICs, reducing BOM count. |
Use Scenario: Local 5V supply for FPGA configuration, SERDES bias, and management MCU on telecom line cards fed from –48V central plant with intermediate 12V or 24V distribution. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck controller converting 24V to 5V, minimizing heat in dense card layouts where airflow is restricted. Use Value: SO-16 package fits standard 100-mil pitch footprints; 110°C/W θJA enables operation at full load without forced air - reduces cooling cost and failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1149IS-5#PBF | No EXTVCC pin; VCC always derived from VIN; higher quiescent current (60µA shutdown vs 20µA); same SO-16 package and pinout. | Lacks efficiency optimization at high VIN; less suitable for 36V+ inputs where LTC1159IS-5#TRPBF's EXTVCC path yields >2% efficiency gain. | Select when EXTVCC complexity is undesirable and input voltage stays ≤24V; verify thermal margin due to higher dissipation. |
| MP2451DJ-LF-Z | Integrated high-/low-side MOSFETs (no external FETs required); fixed 5V output; 3.5–36V input; 0.6A max output; smaller TSOT23-8 package. | Lower current capability and no Burst Mode™ - unsuitable for >1A loads or ultra-low-power sleep modes requiring sub-100µA quiescent. | Choose for space-constrained, lower-current applications where integration outweighs efficiency and thermal flexibility. |
Compared with LTC1149IS-5#PBF, LTC1159IS-5#TRPBF delivers superior high-input-voltage efficiency and deeper shutdown; versus MP2451DJ-LF-Z, it offers higher current, true Burst Mode™ regulation, and industrial temperature support - making it optimal for 2A, 4–40V, -40°C to +85°C systems demanding long battery life and thermal resilience.
Availability
LTC1159IS-5#TRPBF is available at Aetrix Electronics and suitable for notebook computers, industrial sensor nodes, avionics subsystems, and telecom line cards requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LTC1159IS-5#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 instrumentation, aerospace, and industrial markets.
The LTC1159 series was designed as a high-efficiency, wide-input synchronous buck controller family targeting portable and harsh-environment power systems - emphasizing low quiescent current, robust MOSFET drive, and seamless transition between continuous and Burst Mode™ operation.
FAQ
What is the output voltage tolerance of the LTC1159IS-5#TRPBF over temperature and load?
The LTC1159IS-5#TRPBF delivers a fixed 5V output with guaranteed tolerance of ±2.1% across –40°C to +85°C ambient, 5mA to 2A load, and 9V to 40V input. This is specified as 4.90V to 5.20V at 700mA load in the datasheet, with line regulation of ±40mV and load regulation of ±100mV - ensuring stable 5V rail integrity in industrial and avionics applications where precision matters.
Does the LTC1159IS-5#TRPBF require external feedback resistors to set the output voltage?
No, the LTC1159IS-5#TRPBF does not require external feedback resistors. As a fixed-output variant, it uses an internal resistor divider connected to the SENSE– pin to set the 5V output. The VFB pin is unused in this version - simplifying layout, reducing component count, and eliminating resistor tolerance drift effects on output accuracy.
How does the EXTVCC pin improve efficiency in the LTC1159IS-5#TRPBF?
The EXTVCC pin allows the LTC1159IS-5#TRPBF to power its gate drivers from the regulated 5V output instead of the high VIN rail. At VIN = 36V, this reduces driver supply loss by ~40% compared to VIN-sourced VCC, directly contributing to the device's 95% peak efficiency. The internal PNP switch automatically selects the higher of VCC or EXTVCC voltage, ensuring seamless transition.
What is the purpose of the CAP pin on the LTC1159IS-5#TRPBF?
The CAP pin on the LTC1159IS-5#TRPBF provides charge compensation for the internal P-gate level-shifting capacitor. A capacitor (≥0.1µF ceramic) must connect CAP to VCC to supply instantaneous charge during P-gate transitions. Without it, VCC droop can cause unreliable high-side switching - especially critical in high-duty-cycle or high-frequency operation.
Can the LTC1159IS-5#TRPBF operate with 100% duty cycle, and what is the minimum dropout voltage?
Yes, the LTC1159IS-5#TRPBF supports true 100% duty cycle operation, enabling regulation even when VIN approaches VOUT. Its minimum dropout is defined by the VCC regulator: VIN – VCC = 300–400mV at VIN = 4V (typical), meaning it can regulate down to VIN as low as ~5.4V for a stable 5V output - ideal for brownout-tolerant systems and low-voltage battery discharge phases.
LTC1159IS-5#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1159IS-5#TRPBF FAQ
1.How can I place an order for LTC1159IS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159IS-5#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 LTC1159IS-5#TRPBF reliable?
The price and inventory of LTC1159IS-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1159IS-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159IS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159IS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159IS-5#TRPBF?
LTC1159IS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159IS-5#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 LTC1159IS-5#TRPBF?
For technical support, including LTC1159IS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159IS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1159IS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159IS-5#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 LTC1159IS-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159IS-5#TRPBF?
All LTC1159IS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159IS-5#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 LTC1159IS-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159IS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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