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Analog Devices Inc. LTC1159IS#TRPBF
- Part No.:
- LTC1159IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1159IS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,128
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Product details
Overview
LTC1159IS#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 at 300µA standby current, supports 250kHz max switching frequency, and features adaptive non-overlap gate drives for high-efficiency power conversion in industrial and portable systems.
For engineers reviewing the LTC1159IS#TRPBF datasheet, LTC1159IS#TRPBF pinout, LTC1159IS#TRPBF application, or LTC1159IS#TRPBF equivalent, key selection criteria include its –40°C to 85°C industrial temperature rating, SSOP-20 package, programmable current sense threshold (25–170mV), Burst Mode™ operation below ~15% load, and EXTVCC-powered driver architecture enabling high-voltage efficiency optimization.
Technical Context
The LTC1159IS#TRPBF implements a constant off-time current-mode control architecture with internal 4.5V LDO and an EXTVCC-switched driver supply path. Its P-GATE output level-shifts from VIN to VIN–VCC, while N-GATE swings rail-to-rail (0V to VCC), enabling precise timing of complementary MOSFET switching with adaptive non-overlap logic.
It integrates dual shutdown pins (SHDN1 disables control only; SHDN2 shuts down VCC and entire circuit), a programmable CT-based operating frequency, and a gain-amplifier decoupling node (ITH) that dynamically adjusts current-sense threshold versus load. Burst Mode activation occurs at ~15% of maximum output current, reducing quiescent current to 300µA while maintaining regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide industrial and battery-derived supplies without external pre-regulation. |
| Efficiency | Up to 95% - achieved via synchronous FET switching, low-loss gate drives, and EXTVCC-powered drivers at high VIN. |
| Standby Current | 300µA in Burst Mode - maintains output regulation while minimizing no-load power loss. |
| Shutdown Current | 20µA - enables ultra-low-power system sleep states with full circuit disable. |
| Operating Frequency | Up to 250kHz - set by external CT capacitor; frequency scales inversely with (VIN–VOUT)/VIN ratio. |
| Current Sense Threshold | 25mV (low) / 150mV (high) - user-programmable via RSENSE to set peak inductor current and short-circuit limit. |
| Temperature Range | –40°C to +85°C - qualified for industrial environments with guaranteed performance across full range. |
Pinout & Package
Package: 20-lead plastic SSOP (Small Outline Package), JEDEC MS-013AC, 0.65mm pitch, 7.2mm × 5.3mm body, exposed pad not present. Thermal resistance θJA = 135°C/W.
| 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 drive integrity. |
| VIN | Main power input | Accepts 4V–40V; supplies internal LDO and P-drive circuitry; absolute max –15V to 60V. |
| VCC | Internal 4.5V regulator output | Powers control logic and drivers; sourced from internal LDO or EXTVCC via internal PNP switch. |
| P-DRIVE | High-current P-MOSFET gate driver | Swings 0V to VCC; drives gate of P-channel MOSFET through external resistor/capacitor network. |
| CT | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT enables VIN–VOUT compensation. |
| ITH | Gain amplifier decoupling node | Adjusts current comparator threshold voltage; used for loop compensation and load-current tracking. |
| SENSE– | Current comparator negative input / fixed-output reference | In LTC1159IS#TRPBF (adjustable version), connects to external feedback divider; sets output voltage via VFB. |
| SENSE+ | Current comparator positive input | Connects across RSENSE; detects inductor current via 25–170mV threshold window. |
| SHDN1 | Control-only shutdown | Logic-low = normal operation; >0.8V = disables PWM control but leaves VCC active. |
| SHDN2 | Master shutdown | Logic-high (>0.8V) disables VCC regulator and all circuitry; reduces supply current to 20µA. |
| EXTVCC | External driver supply input | Enables higher-efficiency operation by powering drivers from regulated output instead of VIN. |
| PGND | Power ground return | Must connect to source of N-MOSFET and (–) terminal of CIN; separates high di/dt paths from signal ground. |
| SGND | Small-signal ground | Connects to (–) terminal of COUT and feedback network; routed separately from PGND to avoid noise coupling. |
| VFB | Feedback voltage input | Receives divided output voltage; internal reference is 1.25V; sets regulated output in adjustable configuration. |
| N-GATE | N-MOSFET gate driver | Swings 0V to VCC; directly drives gate of synchronous rectifier; referenced to PGND. |
| CAP | Charge compensation | Stabilizes P-GATE level-shifting; capacitor to VCC must exceed gate drive capacitor value. |
| PGND (Pin 14 & 16) | Dual power ground terminals | Provides low-inductance return for both P- and N-MOSFET sources; improves EMI and transient response. |
| SHDN1 (Pin 9) | Dedicated control shutdown | Independent of SHDN2; allows partial system sleep while retaining VCC for auxiliary circuits. |
| VFB (Pin 10) | Adjustable output programming | Confirms LTC1159IS#TRPBF is the adjustable variant (not fixed 3.3V/5V); requires external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~15% load to sustain regulation at 300µA quiescent current-critical for battery longevity. |
| Constant off-time current-mode control | Delivers consistent inductor ripple current and superior line/load transient response without slope compensation. |
| Adaptive non-overlap gate drives | Prevents shoot-through by enforcing dead time between P-GATE and N-GATE transitions-no external timing required. |
| EXTVCC-powered driver architecture | Switches driver supply from internal LDO to regulated output, improving efficiency by >3% at VIN > 20V. |
| Programmable current limit via RSENSE | Supports 0.02Ω–0.2Ω sense resistors; sets peak current, short-circuit protection (ISC(PK) = 150mV/RSENSE), and Burst Mode threshold. |
| Industrial temperature qualification | Guaranteed operation from –40°C to +85°C with full electrical specs tested-enables deployment in harsh environments. |
Applications
| Industrial Power Distribution | Notebook & Palmtop Computers |
|---|---|
|
Use Scenario: Distributed 24V-to-5V/3.3V conversion in factory automation I/O modules with strict thermal and efficiency requirements. IC Role / Device Role / Timing Role: Controller for synchronous buck stage driving discrete Si9435DY/Si9410DY MOSFET pair; manages Burst Mode entry/exit during variable PLC load cycles. Use Value: 95% peak efficiency and 20µA shutdown current extend uptime in unattended equipment; SSOP-20 footprint fits dense PCB layouts. |
Use Scenario: Main system power rail generation in ultra-thin notebooks where input derives from multi-cell Li-ion (8.4V–12.6V). IC Role / Device Role / Timing Role: Constant off-time controller regulating 5V/2A output; uses CT pin to maintain stable 200kHz switching across battery discharge curve. Use Value: Adaptive non-overlap prevents shoot-through during rapid load transients (e.g., CPU burst); EXTVCC mode sustains >92% efficiency at 12.6V input. |
| Portable Instruments | Avionics Systems |
|
Use Scenario: Powering precision ADCs and op-amps in handheld multimeters and spectrum analyzers with single 9V alkaline or LiFePO₄ cell. IC Role / Device Role / Timing Role: Adjustable buck controller (via VFB divider) delivering 3.3V ±1% from 6V–10V input; leverages 300µA Burst Mode for >100-hour standby. Use Value: Low 20µA shutdown current preserves battery life during storage; SSOP package withstands vibration and thermal cycling per MIL-STD-810. |
Use Scenario: 28V aircraft bus to 5V/3.3V conversion in flight data recorders and sensor interface units requiring DO-160 compliance. IC Role / Device Role / Timing Role: High-reliability controller with –40°C to +85°C operation; uses SHDN2 for emergency power-off and SENSE+/– for precise overcurrent detection. Use Value: 40V abs max input handles 28V bus transients; 60dB line rejection suppresses avionics EMI; PGND/SGND separation meets EMC requirements. |
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#TRPBF | No EXTVCC pin; higher 100µA shutdown current; same SSOP-20 package and current-mode architecture. | Lacks driver supply optimization for high-VIN efficiency; better suited for <20V inputs where quiescent current is less critical. | Select when cost sensitivity outweighs >3% efficiency gain at VIN > 24V; verify RSENSE compatibility for identical current limits. |
| LM5116PWPR | Wide-input (6–100V), current-mode controller with integrated high-side driver; no separate P/N-GATE outputs; different pinout and compensation scheme. | Designed for high-VIN industrial/automotive; lacks Burst Mode; requires external bootstrap diode and different CT/ITH design. | Choose for 40–100V inputs or when board space permits larger SOIC-20; rework layout and loop compensation; not drop-in. |
Compared with LTC1149IS#TRPBF, the LTC1159IS#TRPBF adds EXTVCC-driven efficiency gains and lower shutdown current; versus LM5116PWPR, it offers finer current-sense resolution and Burst Mode for ultra-low-power portable use-but requires discrete MOSFETs and more complex gate drive layout.
Availability
LTC1159IS#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, avionics systems, and portable instrumentation requiring stable component supply, long-lifecycle support, and guaranteed –40°C to +85°C performance.
Supply support for LTC1159IS#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) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and efficiency-critical applications.
The LTC1159 series was developed as a high-efficiency synchronous buck controller family targeting battery-operated and industrial systems needing ultralow quiescent current, wide input range, and robust transient response.
FAQ
What is the function of the EXTVCC pin on the LTC1159IS#TRPBF?
The EXTVCC pin on the LTC1159IS#TRPBF enables the internal driver circuitry to be powered from the regulated output voltage instead of the main VIN supply. When connected to VOUT, it activates an internal PNP switch that routes power to VCC, reducing driver losses and improving efficiency-especially above 20V input. This architecture lowers total power dissipation and extends thermal headroom in high-input-voltage applications using the LTC1159IS#TRPBF.
How does Burst Mode™ operation work in the LTC1159IS#TRPBF?
Burst Mode™ in the LTC1159IS#TRPBF automatically engages when load current drops below approximately 15% of the maximum programmed output current. During Burst Mode, the controller ceases continuous switching, enters a low-power sleep state drawing only 300µA, and periodically wakes to deliver energy bursts-maintaining output regulation while minimizing no-load losses. The LTC1159IS#TRPBF exits Burst Mode seamlessly when load increases, ensuring stable transient response without manual intervention.
What is the difference between SHDN1 and SHDN2 on the LTC1159IS#TRPBF?
SHDN1 on the LTC1159IS#TRPBF disables only the PWM control circuitry while leaving the VCC regulator active-useful for preserving auxiliary bias rails. SHDN2 is the master shutdown pin: when driven high (>0.8V), it turns off both the VCC regulator and all internal circuitry, reducing total supply current to just 20µA. For full system power gating, SHDN2 must be used; SHDN1 supports partial sleep modes where VCC remains available for monitoring or wake-up logic in the LTC1159IS#TRPBF.
Can the LTC1159IS#TRPBF be used with standard-threshold MOSFETs?
Yes-the LTC1159IS#TRPBF can drive standard-threshold MOSFETs when the EXTVCC pin is powered from an external supply ≥8V, bypassing the internal 4.5V LDO. In default operation (EXTVCC open), VCC is ~4.5V, requiring logic-level MOSFETs (VGS(TH) < 2.5V). Using higher EXTVCC voltage raises gate drive strength and enables standard devices rated for >30V VDS, expanding input voltage capability beyond 30V-critical for telecom or avionics applications using the LTC1159IS#TRPBF.
What is the purpose of the ITH pin on the LTC1159IS#TRPBF?
The ITH pin on the LTC1159IS#TRPBF serves as the gain amplifier decoupling node and directly modulates the current comparator's threshold voltage. By connecting a capacitor-resistor network from ITH to SGND, designers adjust loop compensation for stability across load and input variations. Additionally, the ITH voltage tracks output load changes-raising the current sense threshold under heavier loads to maintain constant ripple current and optimize transient response in the LTC1159IS#TRPBF.
LTC1159IS#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#TRPBF FAQ
1.How can I place an order for LTC1159IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159IS#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#TRPBF reliable?
The price and inventory of LTC1159IS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159IS#TRPBF?
LTC1159IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159IS#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#TRPBF?
For technical support, including LTC1159IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159IS#TRPBF requirements.
6.How does Aetrix verify that LTC1159IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159IS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159IS#TRPBF?
All LTC1159IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159IS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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