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Analog Devices Inc. LTC1142CG#TRPBF
- Part No.:
- LTC1142CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1142CG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,705
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Product details
Overview
LTC1142CG#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down switching regulator controller driving external complementary MOSFETs for independent 3.3V and 5V outputs. It features constant off-time current-mode control, Burst Mode™ operation for >95% efficiency at light loads, 160µA per regulator standby current, and supports input voltages from 3.5V to 18V. It is used in space-constrained dual-rail power systems such as notebook DC-DC conversion.
For engineers reviewing the LTC1142CG#TRPBF datasheet, LTC1142CG#TRPBF pinout, LTC1142CG#TRPBF application, or LTC1142CG#TRPBF equivalent, key selection criteria include its dual-output fixed-voltage configuration, 250kHz max switching frequency, 25–175mV programmable current-sense threshold, 100% duty-cycle low-dropout capability, and SSOP-28 package compatibility with high-density PCB layouts.
Technical Context
The LTC1142CG#TRPBF implements two independent constant off-time current-mode regulator blocks, each with dedicated CT pins (Pins 11 & 25), ITH pins (Pins 13 & 27), and dual-drive outputs (PDRIVE/NDRIVE) for synchronous P-CH/N-CH MOSFET pairs. Its architecture delivers stable ripple current regulation and automatic mode transition between continuous conduction and Burst Mode™ based on load.
Each section uses an internal 1.25V reference and resistive divider (SENSE–/SENSE+) to set fixed 3.3V and 5V outputs; feedback voltage tolerance is ±2.5% over temperature. The device maintains regulation down to 100% duty cycle, with dropout limited only by external MOSFET RDS(ON), inductor DCR, and sense resistor value - enabling operation near VIN = VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Fixed dual output: 3.3V @ 2A and 5V @ 2A, independently regulated using internal resistive dividers |
| Input Voltage Range | 3.5V to 18V (absolute max 20V); supports wide-input battery and adapter-fed systems |
| Switching Frequency | Up to 250kHz; set per channel via external CT capacitor (e.g., 390pF yields ~200kHz at VIN = 10V) |
| Current Sense Threshold | 25mV to 175mV (programmable via RSENSE); determines peak inductor current and short-circuit protection level |
| Quiescent Current | 160µA per regulator in Burst Mode™ sleep; enables ultra-low-power standby in portable devices |
| Shutdown Current | <22µA total (both channels); achieved via independent CMOS-compatible SHDN3/SHDN5 pins |
| Thermal Performance | θJA = 95°C/W in SSOP-28; max junction temperature 125°C; rated for 0°C to 70°C ambient operation |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.025" pitch, body size 10.2mm × 5.3mm, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+3 (Pin 1) | Positive current sense input for 3.3V regulator | Connects across RSENSE3 to detect inductor current; offset with SENSE–3 sets trip threshold |
| SHDN3 (Pin 2) | Enable/disable control for 3.3V regulator | Low = active; high ≥0.8V = micropower shutdown; requires fast CMOS edge (<1µs) |
| SGND3 (Pin 3) | Small-signal ground reference for 3.3V section | Must be routed separately to (–) terminal of 3.3V output capacitor to avoid noise coupling |
| PGND3 (Pin 4) | Power ground return for 3.3V driver stage | Connects to source of N-CH MOSFET and (–) terminal of 3.3V input capacitor |
| NDRIVE3 (Pin 6) | Gate drive output for bottom N-CH MOSFET (3.3V) | Swings 0V to VIN3; capable of high-current sourcing/sinking for fast FET transitions |
| PDRIVE5 (Pin 9) | Gate drive output for top P-CH MOSFET (5V) | Swings VIN5 to 0V; drives P-FET gate with rail-to-rail swing for low conduction loss |
| VIN5 (Pin 10) | Input supply for 5V regulator section | Must be decoupled locally to PGND5; shares input rail with 3.3V section but has independent filtering |
| CT5 (Pin 11) | Timing capacitor connection for 5V section frequency | Discharge current scales with VOUT5; sets off-time and thus operating frequency |
| ITH5 (Pin 13) | Current comparator threshold bias for 5V section | Voltage here modulates current-sense threshold to track load and improve line/load regulation |
| SENSE–5 (Pin 14) | Negative current sense / feedback node for 5V section | Internal resistive divider sets 5V output; also (–) input to current comparator |
| SENSE+5 (Pin 15) | Positive current sense input for 5V regulator | Paired with SENSE–5 to define current trip point via RSENSE5 |
| SHDN5 (Pin 16) | Enable/disable control for 5V regulator | Independent of SHDN3; allows staggered startup or selective shutdown |
| PGND5 (Pin 18) | Power ground return for 5V driver stage | Separate from PGND3 to prevent cross-regulator ground bounce |
| NDRIVE5 (Pin 20) | Gate drive output for bottom N-CH MOSFET (5V) | Swings 0V to VIN5; complements PDRIVE5 for synchronous rectification |
| PDRIVE3 (Pin 23) | Gate drive output for top P-CH MOSFET (3.3V) | Swings VIN3 to 0V; enables high-efficiency synchronous buck topology |
| VIN3 (Pin 24) | Input supply for 3.3V regulator section | Decoupled locally to PGND3; may share bulk input with VIN5 but requires local ceramic |
| CT3 (Pin 25) | Timing capacitor connection for 3.3V section frequency | Functionally identical to CT5; allows independent frequency tuning per channel |
| ITH3 (Pin 27) | Current comparator threshold bias for 3.3V section | Same function as ITH5; enables adaptive current limiting and load transient compensation |
| SENSE–3 (Pin 28) | Negative current sense / feedback node for 3.3V section | Internal divider sets 3.3V output; also (–) input to 3.3V current comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Enables simultaneous 3.3V/5V rails without external sequencing or cross-regulation interference |
| Burst Mode™ operation | Maintains >90% efficiency down to 1mA load per channel by disabling switching and entering micropower sleep |
| Constant off-time current-mode control | Provides inherent cycle-by-cycle current limiting, excellent load transient response, and stable operation across input/output ratios |
| 100% duty-cycle low-dropout capability | Allows VOUT ≈ VIN during dropout; eliminates need for linear post-regulators in wide-input applications |
| Independent shutdown pins (SHDN3/SHDN5) | Supports flexible power management: individual rail disable, staggered startup, or fault isolation |
| SSOP-28 package with separated power/ground pins | Minimizes layout-induced noise coupling between 3.3V and 5V sections for clean dual-rail performance |
Applications
| Notebook Computer Core Power | Portable Instrument Dual-Rail Supply |
|---|---|
Use Scenario: Providing tightly regulated 3.3V and 5V rails from a single 7–16V Li-ion adapter or battery input in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing discrete P-CH/N-CH MOSFETs per rail with independent frequency and current sensing. Use Value: Eliminates need for two separate controllers, reduces board area by 40%, and achieves >94% efficiency at 500mA load per rail. |
Use Scenario: Powering mixed-signal circuits (microcontroller + analog front-end + display interface) in handheld test equipment with strict low-noise and low-quiescent requirements. IC Role / Device Role / Timing Role: Fixed-output dual regulator delivering stable 3.3V (for logic) and 5V (for analog drivers) with Burst Mode™ extending battery life. Use Value: 160µA per-channel standby current extends runtime by 3.2× versus continuous-mode alternatives at light loads. |
| DC Power Distribution System | Battery-Operated Digital Device |
Use Scenario: Centralized dual-voltage DC-DC conversion in industrial IoT gateways where 3.3V powers MCU/RF and 5V powers sensors/actuators. IC Role / Device Role / Timing Role: High-efficiency controller supporting wide input (6–18V) and maintaining regulation under dynamic load steps up to 2A. Use Value: Constant off-time architecture ensures <50mV load transient deviation and no external compensation required. |
Use Scenario: Compact power solution for rechargeable Bluetooth headsets requiring dual rails from a single-cell 3.7V Li-ion with minimal heat generation. IC Role / Device Role / Timing Role: Dual synchronous buck controller operating in 100% duty-cycle mode at low VIN to maximize usable battery range. Use Value: Achieves 3.3V/5V outputs with <150mV dropout at 1A, extending effective battery discharge to 3.2V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGER | Single-chip dual-output buck (integrated FETs); 4.5–28V input; fixed 3.3V/5V or adjustable; no Burst Mode™ | Higher integration but lower max efficiency at light loads (82% vs 95%); no 100% duty-cycle mode | Select when board space is critical and integrated FETs acceptable; avoid if ultra-low IQ or dropout operation required |
| LTC3855EUH#PBF | Dual-phase single-output controller (not dual-rail); supports 0.6–24V output; requires external FETs; no fixed 3.3V/5V option | Designed for high-current single-rail applications (e.g., 12V→1.2V CPU core); lacks independent dual-rail architecture | Select only for high-current single-output designs; not suitable as direct functional replacement for LTC1142CG#TRPBF |
Compared with TPS54290RGER and LTC3855EUH#PBF, the LTC1142CG#TRPBF uniquely delivers fixed dual-rail outputs with Burst Mode™ efficiency, 100% duty-cycle dropout, and independent channel control - making it optimal for space-constrained, battery-sensitive dual-voltage systems where discrete FET optimization is preferred.
Availability
LTC1142CG#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and DC power distribution systems requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1142CG#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1142CG#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, dual-output synchronous buck conversion in space- and power-constrained portable and industrial systems.
FAQ
What is the maximum input voltage rating for the LTC1142CG#TRPBF?
The LTC1142CG#TRPBF has an absolute maximum input supply voltage of 20V on Pins 10 and 24. Its recommended operating range is 3.5V to 18V for reliable long-term performance. Exceeding 20V risks permanent damage to internal circuitry, including the gate drivers and current comparators. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
Does the LTC1142CG#TRPBF integrate power MOSFETs?
No, the LTC1142CG#TRPBF is a controller-only IC and does not integrate power MOSFETs. It drives external complementary P-channel and N-channel MOSFETs per channel (e.g., Si9430DY/Si9410DY). This architecture allows designers to optimize FET selection for specific voltage, current, thermal, and efficiency requirements - a key differentiator from monolithic dual-buck ICs like the TPS54290.
How does Burst Mode™ operation improve efficiency in the LTC1142CG#TRPBF?
Burst Mode™ in the LTC1142CG#TRPBF reduces quiescent current to 160µA per regulator by disabling switching and entering deep sleep when load current drops below ~10mA. During bursts, the controller delivers short energy packets to maintain regulation, then shuts down most internal circuitry. This enables >90% efficiency at 1mA load - far exceeding continuous-mode controllers - which directly extends battery life in portable applications.
Can the LTC1142CG#TRPBF generate adjustable output voltages?
No, the LTC1142CG#TRPBF is factory-configured for fixed 3.3V and 5V outputs using internal resistive dividers connected to SENSE–3 (Pin 28) and SENSE–5 (Pin 14). For adjustable outputs, select the LTC1142HV-ADJ or LTC1142L-ADJ variants, which expose VFB1/VFB2 pins and require external resistor dividers. Using the CG variant with external feedback will not yield correct regulation.
What is the purpose of the ITH3 and ITH5 pins on the LTC1142CG#TRPBF?
ITH3 (Pin 27) and ITH5 (Pin 13) are gain amplifier decoupling points that modulate the current comparator threshold voltage in real time. As load increases and output voltage sags slightly, the ITH pin voltage rises, raising the current-sense threshold to increase peak inductor current - thereby improving load regulation and transient response without external compensation components.
LTC1142CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 18V
- 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:
- 28-SSOP
LTC1142CG#TRPBF FAQ
1.How can I place an order for LTC1142CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1142CG#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 LTC1142CG#TRPBF reliable?
The price and inventory of LTC1142CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1142CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1142CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1142CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1142CG#TRPBF?
LTC1142CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1142CG#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 LTC1142CG#TRPBF?
For technical support, including LTC1142CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1142CG#TRPBF requirements.
6.How does Aetrix verify that LTC1142CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1142CG#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 LTC1142CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1142CG#TRPBF?
All LTC1142CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1142CG#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 LTC1142CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1142CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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