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Analog Devices Inc. LTC1159CG-5#TRPBF
- Part No.:
- LTC1159CG-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1159CG-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
LTC1159CG-5#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller designed for high-efficiency DC/DC conversion in wide-input industrial and portable systems. It operates from 4V to 40V input, delivers regulated 5V output up to 2A, achieves up to 95% efficiency, maintains 100% duty cycle for ultra-low dropout, and features adaptive non-overlap gate drives with Burst Mode™ operation for <300µA standby current.
For engineers reviewing the LTC1159CG-5#TRPBF datasheet, LTC1159CG-5#TRPBF pinout, LTC1159CG-5#TRPBF application, or LTC1159CG-5#TRPBF equivalent, this page provides verified technical context, confirmed package mapping (20-lead SSOP), validated pin functions, real-world load regulation (±60–100mV), and two field-tested alternative parts with documented functional trade-offs.
Technical Context
The LTC1159CG-5#TRPBF implements a constant off-time current-mode architecture driving external complementary P-channel and N-channel MOSFETs at up to 250kHz. Its internal 4.5V linear regulator powers control circuitry at startup, while EXTVCC allows driver power to be sourced from the regulated output-enabling >90% efficiency at high VIN/VOUT ratios.
It integrates dual shutdown pins (SHDN1 disables control only; SHDN2 shuts down VCC and all circuitry), programmable current sensing via RSENSE (threshold range 25–170mV), and automatic transition between continuous and Burst Mode operation below ~15% of full-scale load-reducing quiescent current to 20µA in shutdown and 300µA in regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide-range industrial and battery-derived supplies without external pre-regulation |
| Output Voltage | Fixed 5.05V (typ) - factory-trimmed for ±2% accuracy over temperature and load (4.90–5.20V) |
| Max Output Current | 2A - determined by external RSENSE (0.05Ω typical) and MOSFET selection |
| Efficiency | Up to 95% - achieved via synchronous FET switching, adaptive non-overlap timing, and EXTVCC efficiency boost |
| Shutdown Current | 20µA - enables long-term battery operation in sleep-critical applications |
| Operating Frequency | Configurable via CT pin (e.g., 390pF → ~250kHz at VIN=10V) - off-time fixed at 4–6µs, frequency varies with VIN/VOUT ratio |
| Thermal Range | 0°C to 70°C (Commercial grade) - junction max 125°C with θJA = 135°C/W in SSOP package |
Pinout & Package
Package: 20-lead plastic SSOP (G package), 0.65mm pitch, JEDEC MS-013AC compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-GATE | Level-shifted top-FET gate drive | Swings from VIN to VIN–VCC (≈VIN–4.5V); drives P-channel MOSFET gate referenced to VIN rail |
| VIN | Main power input | Accepts 4V–40V; supplies internal regulator and P-FET source; absolute max –15V to +60V |
| VCC | Internal 4.5V regulator output | Powers control logic and drivers; sourced from internal LDO or EXTVCC (whichever is higher) |
| P-DRIVE | High-current P-FET gate driver | Swings 0V to VCC; drives external P-channel MOSFET gate through level-shifting network |
| CT | Timing capacitor connection | Sets off-time (4–6µs typ); frequency scales inversely with CT and with (1–VOUT/VIN) |
| ITH | Current comparator threshold control | Voltage on ITH modulates current sense threshold - used for loop compensation and current limiting |
| SENSE– | Inverting input of current comparator & internal feedback divider | Fixed 5.2V reference point for LTC1159CG-5#TRPBF; sets output voltage and current trip point |
| CAP | Charge compensation node | Connects to VCC via capacitor; supplies charge for P-gate level-shift capacitor during transitions |
| SHDN2 | Master shutdown input | Logic-high (>1.4V) disables VCC and entire controller; draws ≤20µA when asserted |
| EXTVCC | External driver supply input | Enables efficiency boost: when connected to regulated output, powers drivers directly and bypasses internal LDO |
| PGND | Power ground return | Must connect to N-MOSFET source and CIN (–) - separates high-current paths from signal ground |
| N-GATE | N-channel MOSFET gate driver | Swings 0V to VCC; directly drives low-side N-FET gate referenced to PGND |
| SGND | Small-signal ground | Separate ground for SENSE+, VFB (not used in -5 variant), and feedback network - routed to COUT (–) |
| SHDN1 | Control-only shutdown | Logic-high (>0.8V) disables PWM and gate drivers but leaves VCC active - useful for sequencing |
| SENSE+ | Non-inverting current sense input | Connected across RSENSE; compares against SENSE– to trigger current limit and off-time initiation |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~15% load, reducing quiescent current to 300µA while maintaining regulation - critical for battery longevity |
| Synchronous FET control | Drives complementary P/N-MOSFET pair with adaptive non-overlap timing - eliminates body-diode conduction loss and improves light-load efficiency |
| EXTVCC efficiency enhancement | Allows driver power to be sourced from regulated output instead of VIN - reduces power dissipation and boosts efficiency by 3–5% at high input voltages |
| Constant off-time current mode | Maintains stable ripple current and excellent line/load transient response independent of input/output voltage ratio - simplifies loop compensation |
| Short-circuit protection | Extends off-time during overload to limit peak inductor current; sustains average short-circuit current near IMAX without thermal runaway |
Applications
| Industrial Power Distribution | Notebook & Palmtop Computers |
|---|---|
Use Scenario: Distributed 24V-to-5V conversion in PLC I/O modules with strict thermal and efficiency requirements. IC Role / Device Role / Timing Role: Primary controller for synchronous buck stage delivering 5V/2A with minimal heatsink area. Use Value: 95% efficiency at full load and 300µA Burst Mode current extend system uptime and reduce cooling needs in sealed enclosures. |
Use Scenario: Main 5V rail generation in legacy x86-based notebooks using discrete MOSFETs for cost and flexibility. IC Role / Device Role / Timing Role: High-efficiency step-down controller enabling extended battery life during low-power states. Use Value: 20µA shutdown current and seamless Burst Mode transition preserve battery charge during suspend-to-RAM cycles. |
| Portable Instruments | Avionics Systems |
Use Scenario: Battery-powered handheld test equipment requiring stable 5V supply across 10–36V Li-ion pack voltage range. IC Role / Device Role / Timing Role: Input-wide buck controller supporting dynamic load steps from µA sensor bias to 2A display backlight. Use Value: Excellent load transient response (<500ns recovery) and ±60mV load regulation ensure measurement accuracy under varying loads. |
Use Scenario: Non-redundant 5V supply in line-replaceable avionics units where reliability and EMI robustness are critical. IC Role / Device Role / Timing Role: Regulator controller with dual shutdown inputs (SHDN1/SHDN2) for fault-isolated power sequencing. Use Value: 60dB line rejection and negative/positive VIN transient immunity prevent spurious resets during aircraft electrical transients. |
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-5#PBF | No EXTVCC pin; higher 100µA shutdown current; same 20-lead SO package | Lacks efficiency boost at high VIN; less suitable for >24V input systems requiring >92% efficiency | Choose when board space permits SO package and EXTVCC benefit is unnecessary |
| LM5116MH/NOPB | Wide VIN (6–100V); no integrated current sense threshold; requires external current sense amp | Supports higher input voltages but adds BOM cost and layout complexity; lacks Burst Mode | Prefer for >40V input or when programmable current limit is required over fixed 150mV threshold |
Compared with LTC1159CG-5#TRPBF, LTC1149CS-5#PBF trades efficiency optimization for pinout simplicity and broader temperature availability, while LM5116MH/NOPB extends input range at the cost of added external components and absence of automatic light-load mode - making LTC1159CG-5#TRPBF optimal for 4–40V, high-efficiency, low-quiescent industrial and portable designs.
Availability
LTC1159CG-5#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, portable instrumentation, and avionics subsystems requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for LTC1159CG-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC1159 series was designed specifically for high-efficiency, wide-input synchronous buck conversion in space-constrained portable and industrial systems - emphasizing ultralow quiescent current, adaptive gate drive, and seamless light-load mode transitions.
FAQ
What is the exact output voltage tolerance of the LTC1159CG-5#TRPBF?
The LTC1159CG-5#TRPBF delivers a factory-trimmed fixed 5V output with guaranteed tolerance of ±2% over temperature and load: 4.90V minimum to 5.20V maximum at 700mA load and VIN = 9V, per the G-grade specifications covering 0°C to 70°C operation.
Does the LTC1159CG-5#TRPBF require an external feedback resistor divider?
No - the LTC1159CG-5#TRPBF is a fixed-output variant with internal feedback divider connected to the SENSE– pin; the VFB pin is unused. Only the adjustable LTC1159 (non-suffixed) requires an external resistor divider between VOUT and VFB.
How does the EXTVCC pin improve efficiency in the LTC1159CG-5#TRPBF?
The EXTVCC pin allows the LTC1159CG-5#TRPBF to power its MOSFET drivers directly from the regulated 5V output instead of the higher VIN rail. This eliminates the 4.5V LDO dropout loss, improving full-load efficiency by 3–5% - especially beneficial at VIN > 15V where LDO dissipation would otherwise dominate.
What is the purpose of the dual shutdown pins (SHDN1 and SHDN2) on the LTC1159CG-5#TRPBF?
SHDN2 is the master shutdown pin: pulling it high disables VCC and all circuitry, reducing supply current to 20µA. SHDN1 disables only the PWM and gate drivers while keeping VCC active - enabling controlled sequencing, brown-out hold-off, or safe state retention without full system reset.
Can the LTC1159CG-5#TRPBF operate with 100% duty cycle, and what does that enable?
Yes - the LTC1159CG-5#TRPBF supports true 100% duty cycle operation, allowing VOUT to approach VIN minus small losses. This enables ultra-low dropout regulation, critical for applications like battery-powered systems where input voltage may sag close to the required 5V output during discharge.
LTC1159CG-5#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-5#TRPBF FAQ
1.How can I place an order for LTC1159CG-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1159CG-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 LTC1159CG-5#TRPBF reliable?
The price and inventory of LTC1159CG-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 LTC1159CG-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1159CG-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1159CG-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1159CG-5#TRPBF?
LTC1159CG-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1159CG-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 LTC1159CG-5#TRPBF?
For technical support, including LTC1159CG-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1159CG-5#TRPBF requirements.
6.How does Aetrix verify that LTC1159CG-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1159CG-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 LTC1159CG-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1159CG-5#TRPBF?
All LTC1159CG-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1159CG-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 LTC1159CG-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1159CG-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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