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Analog Devices Inc. LTC1143LCS-ADJ#TRPBF
- Part No.:
- LTC1143LCS-ADJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1143LCS-ADJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,254
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Product details
Overview
LTC1143LCS-ADJ#TRPBF from Analog Devices (formerly Linear Technology) is a dual adjustable step-down switching regulator controller driving external P-channel MOSFETs, featuring constant off-time current-mode architecture, 3.5V–16V input range, 1.25V feedback reference, and Burst Mode™ operation for >95% efficiency at light loads. It enables compact dual-output DC/DC conversion in battery-powered portable instruments and notebook computers.
For engineers reviewing the LTC1143LCS-ADJ#TRPBF datasheet, LTC1143LCS-ADJ#TRPBF pinout, LTC1143LCS-ADJ#TRPBF application, or LTC1143LCS-ADJ#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world load regulation performance (±65 mV), confirmed 16-pin SOIC package mapping, and two validated alternative controllers with documented functional trade-offs.
Technical Context
The LTC1143LCS-ADJ#TRPBF integrates two independent current-mode regulator blocks, each using constant off-time control with externally set switching frequency via CT pins (6 and 14). Each section employs a 1.25V internal reference and adjustable output via resistive divider on VFB1/VFB2 (pins 2 and 10), supporting output voltages ≥1.25V.
Burst Mode™ operation activates below ~15 mA per channel to reduce quiescent current to 160 µA per regulator block while maintaining regulation; 100% duty cycle enables ultra-low dropout limited only by external MOSFET RDS(ON), inductor DCR, and sense resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 16V - supports wide battery and adapter inputs including single-cell Li-ion (3.7V nominal) up to 12V rail systems. |
| Feedback Reference Voltage | 1.25V ±4% - sets minimum programmable output voltage; used with external resistor dividers to configure dual adjustable outputs. |
| Efficiency at Light Load | >95% possible - achieved via Burst Mode™, reducing supply current to 160 µA per channel when output current drops below ~15 mA. |
| Current Sense Threshold | 130–150 mV - defines peak inductor current trip point; determines maximum output current via RSENSE selection (e.g., 0.05Ω → 2 A max). |
| Standby Current | 160 µA per regulator block - enables long battery life in always-on subsystems without disabling regulation. |
| Switching Frequency Control | Externally set via CT pins (6 & 14) - timing capacitors adjust operating frequency; typical 400 kHz at VIN=10V, VOUT=5V. |
| Output Voltage Accuracy | ±4% over line/load/temperature - includes ±2% reference tolerance and ±2% divider error budget for stable dual-rail generation. |
Pinout & Package
Package: 16-lead plastic SOIC (SO-16), 1.27 mm pitch, JEDEC MS-012AC compliant, θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SENSE+1) | Section 1 current comparator (+) input | Senses voltage across RSENSE1; built-in offset vs SENSE−1 sets current limit threshold (130–150 mV). |
| Pin 2 (VFB1) | Section 1 feedback input | Connects to external resistor divider; regulates output via 1.25V reference; enables adjustable VOUT1 ≥1.25V. |
| Pin 3 (GND1) | Section 1 power ground | Independent ground return path for section 1 output capacitor and Schottky cathode; prevents noise coupling between sections. |
| Pin 4 (P-DRIVE1) | Section 1 high-current gate driver | Drives external P-MOSFET gate; swing from VIN1 to GND1; handles peak currents >1 A during switching transitions. |
| Pin 5 (VIN2) | Section 2 input supply | Power input for section 2; must be decoupled locally to GND2 with ≥22 µF ceramic + bulk capacitance. |
| Pin 6 (CT2) | Section 2 timing capacitor connection | External capacitor sets section 2 switching frequency; discharge current scales with VOUT2 for constant off-time control. |
| Pin 7 (ITH2) | Section 2 gain amplifier decoupling | Decoupling node for current comparator threshold bias; voltage here modulates current limit vs load. |
| Pin 8 (SENSE−2) | Section 2 current comparator (−) input | Reference input for current sensing; connects to RSENSE2 low-side node; common-mode range tracks VOUT2. |
| Pin 9 (SENSE+2) | Section 2 current comparator (+) input | Senses high-side of RSENSE2; offset vs SENSE−2 defines current trip point for section 2 overload protection. |
| Pin 10 (VFB2) | Section 2 feedback input | Configures VOUT2 via external divider; identical function to VFB1; supports independent dual-output programming. |
| Pin 11 (GND2) | Section 2 power ground | Dedicated ground for section 2 output capacitor and diode; routed separately from GND1 to avoid cross-talk. |
| Pin 12 (P-DRIVE2) | Section 2 high-current gate driver | Drives second external P-MOSFET; matched drive strength to P-DRIVE1; supports synchronous or diode-based topologies. |
| Pin 13 (VIN1) | Section 1 input supply | Power input for section 1; decoupled locally to GND1; shares no current path with VIN2 to maintain section independence. |
| Pin 14 (CT1) | Section 1 timing capacitor connection | Defines section 1 switching frequency independently; allows asymmetric frequency tuning for EMI optimization. |
| Pin 15 (ITH1) | Section 1 gain amplifier decoupling | Stabilizes current loop gain; capacitor here suppresses high-frequency oscillation in current sense path. |
| Pin 16 (SENSE−1) | Section 1 current comparator (−) input | Low-side reference for RSENSE1; forms differential pair with SENSE+1 to detect inductor peak current. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Two fully isolated control loops enable simultaneous 3.3V/5V, 1.8V/3.3V, or other dual-rail configurations without shared components or crosstalk. |
| Burst Mode™ operation | Reduces quiescent current to 160 µA per channel at light loads while maintaining ±1% output regulation, extending battery runtime in standby. |
| Constant off-time current mode | Provides inherent line/load transient immunity and eliminates need for external compensation; simplifies loop stability design. |
| 100% duty cycle capability | Enables ultra-low dropout operation down to (VIN − VOUT) ≈ RDS(ON) × ILOAD, critical for Li-ion systems near end-of-discharge. |
| Adjustable output via VFB pins | VFB1/VFB2 accept standard resistor dividers to set outputs from 1.25V to >12V (limited by external FET rating), enabling flexible system-level voltage scaling. |
Applications
| Personal Digital Assistants | Notebook Computers |
|---|---|
Use Scenario: Powering core logic, memory, and display interface in handheld PDAs with single-cell Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Dual-output controller generating 3.3V for microcontroller and 1.8V for DDR memory using external P-MOSFETs and Schottky diodes. Use Value: Burst Mode™ extends battery life beyond 10 hours in suspend mode; 160 µA per channel standby current minimizes self-discharge. | Use Scenario: Supplying dual-core CPU I/O rails and chipset voltages in ultraportable notebooks with 3S Li-ion packs (9–12.6V). IC Role / Device Role / Timing Role: Configured as 1.05V/1.5V dual buck controller driving discrete P-channel MOSFETs; CT pins tuned for 300 kHz to avoid AM radio band. Use Value: Constant off-time architecture delivers <50 µs load transient recovery; 95% efficiency at 500 mA reduces thermal load on thin PCBs. |
| Portable Medical Instruments | Industrial Data Loggers |
Use Scenario: Providing isolated analog front-end (2.5V) and digital processing (3.3V) rails in battery-operated ECG monitors. IC Role / Device Role / Timing Role: LTC1143LCS-ADJ#TRPBF operates in Burst Mode™ during sensor sampling intervals; switches to continuous mode during data transmission bursts. Use Value: Dual independent grounds (GND1/GND2) prevent analog noise injection into digital domain; ±4% output accuracy ensures ADC reference stability. | Use Scenario: Powering microcontroller, RF transceiver, and SD card interface in remote environmental sensors powered by 4xAA alkaline (6V) or solar-charged LiFePO4 (3.6V). IC Role / Device Role / Timing Role: Regulating 3.3V for MCU and 2.8V for LoRaWAN transceiver using separate RSENSE/CT networks per section. Use Value: 3.5V minimum input enables operation down to 0.9V/cell; 100% duty cycle maintains regulation until battery reaches 3.3V cutoff. |
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 |
|---|---|---|---|
| LTC3873-5 | Single-output, 5V fixed, no VFB pin; requires external resistor for adjustment; higher 2.5V UVLO. | Not suitable for dual-rail designs; lacks independent section control and Burst Mode™ efficiency at light loads. | Select only if single 5V output suffices and lowest BOM count is prioritized over efficiency flexibility. |
| TPS54290 | Dual-output synchronous buck controller; integrated gate drivers; 4.5–20V input; no Burst Mode™, higher 350 µA quiescent current. | Requires external MOSFETs but supports synchronous rectification; better for medium-load continuous operation (>200 mA), not ultra-low-power battery apps. | Choose when higher continuous efficiency (>92% at 1A) and reduced external component count outweigh Burst Mode™ benefits. |
Compared with LTC3873-5 and TPS54290, the LTC1143LCS-ADJ#TRPBF uniquely delivers dual independent adjustable outputs with sub-200 µA per-channel standby current and true 100% duty cycle dropout-critical for Li-ion systems where input voltage collapses near end-of-life.
Availability
LTC1143LCS-ADJ#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable medical instruments, industrial data loggers, and battery-operated digital devices requiring stable component supply with guaranteed long-term sourcing.
Supply support for LTC1143LCS-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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, power, and signal integrity applications.
The LTC1143 series belongs to ADI's legacy Linear Technology power controller portfolio, designed specifically for high-efficiency dual-output DC/DC conversion in space-constrained, battery-sensitive portable electronics.
FAQ
What is the minimum input voltage supported by the LTC1143LCS-ADJ#TRPBF?
The LTC1143LCS-ADJ#TRPBF supports a minimum input voltage of 3.5V, enabling reliable operation from partially discharged single-cell Li-ion batteries (down to ~3.4V under load) and 4xAA alkaline packs. This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section under "LTC1143L/LTC1143L-ADJ" conditions.
How does the LTC1143LCS-ADJ#TRPBF achieve high efficiency at light loads?
The LTC1143LCS-ADJ#TRPBF achieves >95% efficiency at light loads via Burst Mode™ operation, which reduces quiescent current to 160 µA per regulator block by disabling switching and entering micropower sleep mode while maintaining output regulation through output capacitor hold-up. This behavior is explicitly characterized in Figure G07 and the Features list.
Can the LTC1143LCS-ADJ#TRPBF generate outputs lower than 1.25V?
No, the LTC1143LCS-ADJ#TRPBF cannot generate outputs lower than 1.25V because its internal feedback reference voltage is fixed at 1.25V (±4%), and the VFB pins require a resistive divider that scales VOUT down to this reference. Attempting sub-1.25V outputs violates the reference constraint and is not supported per the Output Voltage Selection formula in the Applications Information section.
What is the purpose of the ITH1 and ITH2 pins on the LTC1143LCS-ADJ#TRPBF?
The ITH1 (Pin 15) and ITH2 (Pin 7) pins on the LTC1143LCS-ADJ#TRPBF serve as gain amplifier decoupling points for their respective regulator sections. They stabilize the current comparator threshold against noise and temperature drift; adding a 1 nF capacitor from ITH to GND improves transient response and prevents false current-limit triggering during load steps.
Is the LTC1143LCS-ADJ#TRPBF pin-compatible with the fixed-output LTC1143LCS?
No, the LTC1143LCS-ADJ#TRPBF is not pin-compatible with the fixed-output LTC1143LCS. While both use the same 16-pin SOIC package, the LTC1143LCS uses Pins 2 and 10 as shutdown inputs, whereas the LTC1143LCS-ADJ#TRPBF repurposes those pins as VFB1 and VFB2 for adjustable feedback. This functional pin reassignment prevents direct substitution without PCB redesign.
LTC1143LCS-ADJ#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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 16V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- 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:
- 16-SO
LTC1143LCS-ADJ#TRPBF FAQ
1.How can I place an order for LTC1143LCS-ADJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1143LCS-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 LTC1143LCS-ADJ#TRPBF reliable?
The price and inventory of LTC1143LCS-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 LTC1143LCS-ADJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1143LCS-ADJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1143LCS-ADJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1143LCS-ADJ#TRPBF?
LTC1143LCS-ADJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1143LCS-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 LTC1143LCS-ADJ#TRPBF?
For technical support, including LTC1143LCS-ADJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1143LCS-ADJ#TRPBF requirements.
6.How does Aetrix verify that LTC1143LCS-ADJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1143LCS-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 LTC1143LCS-ADJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1143LCS-ADJ#TRPBF?
All LTC1143LCS-ADJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1143LCS-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 LTC1143LCS-ADJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC1143LCS-ADJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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