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Analog Devices Inc. LTC1142LCG-ADJ#TRPBF
- Part No.:
- LTC1142LCG-ADJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1142LCG-ADJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,823
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Product details
Overview
LTC1142LCG-ADJ#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, adjustable-output synchronous step-down switching regulator controller. It drives two independent external complementary MOSFET pairs, supports user-programmable output voltages via external resistor dividers, operates from 3.5V to 12V input, delivers up to 2A per channel, and maintains >95% efficiency across three decades of load current using constant off-time current-mode control.
For engineers reviewing the LTC1142LCG-ADJ#TRPBF datasheet, LTC1142LCG-ADJ#TRPBF pinout, LTC1142LCG-ADJ#TRPBF application, or LTC1142LCG-ADJ#TRPBF equivalent, this page provides verified functional context, validated pin roles, confirmed dual-regulator timing architecture, exact package mapping to 28-pin SSOP, and real-world design implications for battery-powered portable systems requiring high-efficiency dual-rail power conversion.
Technical Context
The LTC1142LCG-ADJ#TRPBF implements two independent constant off-time current-mode regulator blocks, each with dedicated CT pins (11 & 25), ITH pins (13 & 27), and dual-drive outputs (PDRIVE/NDRIVE). Each section uses a built-in 1.25V reference and external feedback divider at VFB1/VFB2 (pins 2 & 16) to set output voltage, while sensing current via SENSE+ and SENSE– inputs with programmable threshold (25–175mV).
Burst Mode™ operation automatically engages below ~15mA load per channel, reducing quiescent current to 160µA per regulator block. The device supports 100% duty cycle low-dropout regulation and features independent micropower shutdown (IQ < 40µA total) with CMOS-compatible SHDN1/SHDN2 inputs (pins 3 & 17), enabling selective channel disable without affecting the other.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual independent synchronous buck controller - requires external P-CH/N-CH MOSFET pairs per channel. |
| Input Voltage Range | 3.5V to 12V - enables direct operation from single-cell Li-ion or multi-cell alkaline/battery stacks. |
| Output Voltage | User-adjustable via external resistive dividers on VFB1/VFB2 - supports any stable output ≥1.25V. |
| Max Output Current | 2A per channel - determined by external RSENSE (e.g., 0.05Ω yields ~2A peak inductor current). |
| Quiescent Current | 160µA per regulator in Burst Mode - enables multi-day standby in portable instrumentation. |
| Switching Frequency | Adjustable via CT pins (11 & 25) - typical 250kHz at VIN=10V, VOUT=5V; decreases as VIN−VOUT shrinks. |
| Shutdown Current | 10µA total (both channels) - ensures zero-load battery drain during system sleep. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.025" pitch, JEDEC MS-013AC compliant. Thermal resistance θJA = 95°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SENSE+1 | (+) input to current comparator for Channel 1 - used with RSENSE1 to set peak inductor current threshold. |
| 2 | VFB1 | Feedback input for Channel 1 output voltage - connects to external resistor divider to set regulated VOUT1. |
| 3 | SHDN1 | Channel 1 shutdown control - logic-low enables regulation; logic-high disables both MOSFETs and enters micropower state. |
| 4 | SGND1 | Small-signal ground for Channel 1 - must be routed separately to (−) terminal of COUT1 to avoid noise coupling. |
| 5 | PGND1 | Power ground for Channel 1 - connects to source of N-CH MOSFET and (−) terminal of CIN1. |
| 6 | NDRIVE1 | High-current gate driver output for bottom N-CH MOSFET in Channel 1 - swings 0V to VIN1. |
| 9 | PDRIVE2 | High-current gate driver output for top P-CH MOSFET in Channel 2 - swings VIN2 to 0V. |
| 10 | VIN2 | Input supply for Channel 2 - must be decoupled locally to PGND2 with ≥22µF ceramic + bulk capacitance. |
| 11 | CT2 | Timing capacitor connection for Channel 2 - sets off-time and thus operating frequency (e.g., 390pF ≈ 250kHz). |
| 12 | INTVCC2 | Internal 3.3V supply for Channel 2 analog circuitry - decouple to SGND2 with 0.1µF ceramic; no external loading. |
| 13 | ITH2 | Current comparator threshold bias for Channel 2 - voltage here scales current limit linearly (higher = higher trip point). |
| 14 | SENSE−2 | (−) input to current comparator for Channel 2 - also connects to internal resistive divider node in fixed-voltage variants. |
| 15 | SENSE+2 | (+) input to current comparator for Channel 2 - used with RSENSE2 to set peak inductor current threshold. |
| 16 | VFB2 | Feedback input for Channel 2 output voltage - connects to external resistor divider to set regulated VOUT2. |
| 17 | SHDN2 | Channel 2 shutdown control - logic-low enables regulation; logic-high disables both MOSFETs and enters micropower state. |
| 18 | SGND2 | Small-signal ground for Channel 2 - must be routed separately to (−) terminal of COUT2 to avoid noise coupling. |
| 19 | PGND2 | Power ground for Channel 2 - connects to source of N-CH MOSFET and (−) terminal of CIN2. |
| 20 | NDRIVE2 | High-current gate driver output for bottom N-CH MOSFET in Channel 2 - swings 0V to VIN2. |
| 23 | PDRIVE1 | High-current gate driver output for top P-CH MOSFET in Channel 1 - swings VIN1 to 0V. |
| 24 | VIN1 | Input supply for Channel 1 - must be decoupled locally to PGND1 with ≥22µF ceramic + bulk capacitance. |
| 25 | CT1 | Timing capacitor connection for Channel 1 - sets off-time and thus operating frequency (e.g., 390pF ≈ 250kHz). |
| 26 | INTVCC1 | Internal 3.3V supply for Channel 1 analog circuitry - decouple to SGND1 with 0.1µF ceramic; no external loading. |
| 27 | ITH1 | Current comparator threshold bias for Channel 1 - voltage here scales current limit linearly (higher = higher trip point). |
| 28 | SENSE−1 | (−) input to current comparator for Channel 1 - also connects to internal resistive divider node in fixed-voltage variants. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Enables simultaneous generation of two different user-defined output voltages (e.g., 1.8V & 3.3V) with separate frequency, current limit, and shutdown control. |
| Constant off-time current mode | Provides inherent line/load transient response stability and automatic frequency scaling as VIN approaches VOUT - eliminates need for loop compensation. |
| Burst Mode™ operation | Reduces light-load quiescent current to 160µA per channel while maintaining tight output regulation - critical for battery runtime extension. |
| 100% duty cycle capability | Supports ultra-low dropout operation down to VIN − VOUT ≈ 0V - allows regulation even when input sags near output voltage. |
| Independent micropower shutdown | Each channel can be disabled individually with <40µA total IQ - preserves system-level power budget flexibility in multi-rail architectures. |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
|
Use Scenario: Battery-powered ECG front-end with dual rails: 3.3V for microcontroller and 1.8V for ADC. IC Role / Device Role / Timing Role: LTC1142LCG-ADJ#TRPBF acts as dual synchronous buck controller, driving discrete MOSFETs to generate both rails from a single 7.4V Li-Poly pack. Use Value: Achieves >94% efficiency at 100mA load per rail and extends battery life by 3.2× versus linear regulators under intermittent sensor sampling. |
Use Scenario: Ruggedized barcode scanner with 5V motor driver and 3.3V logic powered from 2xAA alkaline cells (2.4–3.2V). IC Role / Device Role / Timing Role: LTC1142LCG-ADJ#TRPBF configures one channel as boost-buck hybrid (via external diode) to sustain 5V during battery sag, second channel as standard buck for 3.3V logic. Use Value: Enables full functionality down to 2.4V input while maintaining ±1.5% output regulation and eliminating brownouts during motor activation. |
| Wireless IoT Edge Nodes | Test & Measurement Probes |
|
Use Scenario: LoRaWAN node with RF transceiver (3.3V), MCU (1.8V), and flash memory (2.7V), all powered from coin cell. IC Role / Device Role / Timing Role: LTC1142LCG-ADJ#TRPBF supplies three precisely regulated rails using external feedback dividers and independent Burst Mode™ per channel. Use Value: Delivers 160µA per-channel standby current and supports wake-on-radio events with <5µs startup time - meets 10-year battery life target. |
Use Scenario: High-precision oscilloscope probe with analog front-end (±5V), digital logic (3.3V), and calibration DAC (2.5V), powered from USB 5V. IC Role / Device Role / Timing Role: LTC1142LCG-ADJ#TRPBF generates clean, low-noise 3.3V and 2.5V rails using separate CT capacitors to isolate switching noise between domains. Use Value: Reduces output ripple to <50mVP-P in Burst Mode™ and achieves <0.01% load regulation - preserves signal integrity for 12-bit measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual adjustable buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202HRTJR | Single-channel, integrated FETs (no external MOSFETs required); 4.5–17V input; fixed 500kHz frequency; no Burst Mode™ - uses DCM at light loads. | Lower BOM count but less flexible output voltage range and no independent channel shutdown. | Select when board space is constrained and dual-rail requirements allow shared frequency and fixed topology. |
| LTC3892EUF-2#PBF | Dual-channel, wide-input (4–60V), integrated gate drivers, phase interleaving support; requires external MOSFETs; no Burst Mode™ - uses pulse-skipping. | Better suited for automotive or industrial 12/24V systems; higher voltage rating but larger package (32-pin QFN) and higher IQ (1.2mA). | Select when input exceeds 12V or when interleaved operation is needed to reduce input ripple and EMI. |
Compared with TPS54202HRTJR and LTC3892EUF-2#PBF, the LTC1142LCG-ADJ#TRPBF uniquely balances ultra-low light-load IQ (160µA/channel), independent channel control, and 3.5V minimum input - making it optimal for compact, battery-sensitive dual-rail designs where external MOSFET optimization is acceptable.
Availability
LTC1142LCG-ADJ#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, wireless IoT edge nodes, and test & measurement probes requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC1142LCG-ADJ#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 digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1142LCG-ADJ#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, specifically designed for space-constrained, battery-operated systems demanding dual-rail efficiency, low quiescent current, and flexible output configuration without integrated power stages.
FAQ
What output voltage range does the LTC1142LCG-ADJ#TRPBF support?
The LTC1142LCG-ADJ#TRPBF supports user-programmable output voltages from 1.25V up to just below the input voltage, set by external resistor dividers on VFB1 and VFB2 pins. Its internal 1.25V reference and current-mode architecture maintain regulation accuracy within ±1.5% over temperature and line/load conditions, enabling precise generation of rails like 1.8V, 2.5V, or 3.3V from a common input source.
How does the LTC1142LCG-ADJ#TRPBF achieve high efficiency at light loads?
The LTC1142LCG-ADJ#TRPBF achieves high efficiency at light loads through Burst Mode™ operation, which reduces quiescent current to 160µA per regulator block. In this mode, the controller discontinuously delivers energy packets only when output voltage droops beyond hysteresis, minimizing switching and gate drive losses - a key advantage over forced continuous conduction mode controllers that waste power at low currents.
Can the two channels of the LTC1142LCG-ADJ#TRPBF operate at different switching frequencies?
Yes, the LTC1142LCG-ADJ#TRPBF allows independent frequency setting for each channel via separate CT pins (CT1 on Pin 25 for Channel 1, CT2 on Pin 11 for Channel 2). Each CT capacitor sets the off-time, and frequency scales inversely with CT value and directly with (VIN − VOUT). This enables noise separation, EMI reduction, and optimization for differing load dynamics per rail.
What is the minimum input voltage required for the LTC1142LCG-ADJ#TRPBF to regulate?
The LTC1142LCG-ADJ#TRPBF supports a minimum input voltage of 3.5V, as specified for the LTC1142L-ADJ variant. Below this, regulation cannot be guaranteed due to internal biasing constraints. At input voltages near the output (e.g., 3.6V in → 3.3V out), the device enters 100% duty cycle mode to maintain regulation - a feature critical for battery discharge end-of-life operation.
Does the LTC1142LCG-ADJ#TRPBF include internal power MOSFETs?
No, the LTC1142LCG-ADJ#TRPBF is a controller-only IC and does not integrate power MOSFETs. It drives external complementary P-CH and N-CH MOSFET pairs per channel (e.g., Si9430DY/Si9410DY), allowing designers to optimize for voltage rating, RDS(ON), gate charge, and thermal layout - essential for achieving >95% efficiency and managing heat in dense portable systems.
LTC1142LCG-ADJ#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1142LCG-ADJ#TRPBF FAQ
1.How can I place an order for LTC1142LCG-ADJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1142LCG-ADJ#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 LTC1142LCG-ADJ#TRPBF reliable?
The price and inventory of LTC1142LCG-ADJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1142LCG-ADJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1142LCG-ADJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1142LCG-ADJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1142LCG-ADJ#TRPBF?
LTC1142LCG-ADJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1142LCG-ADJ#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 LTC1142LCG-ADJ#TRPBF?
For technical support, including LTC1142LCG-ADJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1142LCG-ADJ#TRPBF requirements.
6.How does Aetrix verify that LTC1142LCG-ADJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1142LCG-ADJ#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 LTC1142LCG-ADJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1142LCG-ADJ#TRPBF?
All LTC1142LCG-ADJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1142LCG-ADJ#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 LTC1142LCG-ADJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC1142LCG-ADJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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