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Analog Devices Inc. LTC1143CS#TRPBF
- Part No.:
- LTC1143CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1143CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,543
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Product details
Overview
LTC1143CS#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, constant off-time current-mode step-down switching regulator controller driving external P-channel MOSFETs. It delivers fixed 3.3V and 5V outputs with ≥95% peak efficiency, 160µA per-regulator standby current, and 3.5V–16V input range-optimized for space-constrained battery-powered computing systems.
For engineers reviewing the LTC1143CS#TRPBF datasheet, LTC1143CS#TRPBF pinout, LTC1143CS#TRPBF application, or LTC1143CS#TRPBF equivalent, this page provides verified pin functions, confirmed dual-output regulation behavior, validated burst-mode efficiency curves across load range, and real-world alternative selection guidance for portable DC-DC designs.
Technical Context
The LTC1143CS#TRPBF implements two independent current-mode control loops using constant off-time architecture, each with dedicated CT pins (Pins 6 & 14) to set switching frequency up to 400kHz. Feedback is internally trimmed to 3.3V and 5V via internal resistive dividers-no external VFB resistors required.
It features automatic Burst Mode™ operation below ~15mA load per channel, reducing quiescent current to 160µA per regulator block while maintaining regulation. Shutdown pins (Pins 2 & 10) accept CMOS-level logic signals to disable individual channels independently.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual fixed-output: 3.3V and 5V, each with independent control loop and shutdown |
| Input Voltage Range | 3.5V to 16V-supports wide-input battery and adapter supplies without pre-regulation |
| Peak Efficiency | ≥95% at full load-enables high-power-density designs with minimal thermal derating |
| Standby Current | 160µA per regulator in sleep mode-extends battery life in low-duty-cycle portable applications |
| Switching Architecture | Constant off-time current mode-provides inherent line/load transient immunity and stable loop response |
| Max Switching Frequency | 400kHz-balances EMI, component size, and gate drive losses for compact layouts |
| Dropout Behavior | 100% duty cycle operation-enables ultra-low dropout regulation limited only by external MOSFET RDS(ON) and sense resistor |
Pinout & Package
Package: 16-pin narrow SO (SO-16), 1.27mm pitch, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SENSE+1) | Current sense positive input (3.3V section) | Connects across RSENSE to detect inductor current; built-in 25mV–150mV threshold offset sets peak current limit |
| Pin 2 (SHUTDOWN3) | Logic-controlled enable/disable (3.3V section) | CMOS-compatible input: <0.8V enables, >2V disables; tr/tf <1µs required to prevent false triggering |
| Pin 3 (GND3) | 3.3V section power ground | Must be routed separately to output capacitor negative and Schottky cathode-prevents ground bounce in high di/dt paths |
| Pin 4 (P-DRIVE1) | High-current gate driver output (3.3V section) | Drives P-MOSFET source-to-drain; swing from VIN3 to GND3; supports >1A peak gate charge delivery |
| Pin 5 (VIN2) | 5V section input supply | Requires local 22µF/25V ceramic + bulk decoupling; max 16V absolute rating |
| Pin 6 (CT2) | Timing capacitor connection (5V section) | External capacitor (e.g., 300pF) sets off-time and operating frequency; discharge current scales with VOUT |
| Pin 7 (ITH2) | Gain amplifier decoupling point (5V section) | Connect 0.1µF ceramic to GND2; voltage here modulates current comparator threshold vs load |
| Pin 8 (SENSE–2) | Current sense negative input (5V section) | Internal reference node for current comparator; also connects to internal 5V divider network |
| Pin 9 (SENSE+2) | Current sense positive input (5V section) | Paired with Pin 8 to sense RSENSE voltage drop; defines current trip threshold with built-in offset |
| Pin 10 (SHUTDOWN5) | Logic-controlled enable/disable (5V section) | Independent shutdown control; identical electrical specs to Pin 2 |
| Pin 11 (GND2) | 5V section power ground | Separate ground return path required-must not share trace with GND3 or system AGND |
| Pin 12 (P-DRIVE2) | High-current gate driver output (5V section) | Same drive capability as Pin 4; optimized for P-MOSFET gate capacitance up to 2nF |
| Pin 13 (VIN1) | 3.3V section input supply | Decoupling identical to Pin 5; shares same 3.5V–16V input spec |
| Pin 14 (CT1) | Timing capacitor connection (3.3V section) | Independent frequency setting-allows asymmetric switching frequencies between sections |
| Pin 15 (ITH1) | Gain amplifier decoupling point (3.3V section) | Same function as Pin 7; requires local 0.1µF ceramic bypass |
| Pin 16 (SENSE–1) | Current sense negative input (3.3V section) | Internal reference for 3.3V current comparator; tied to internal 3.3V divider |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Maintains ≥85% efficiency down to 1mA load per channel by disabling switching and entering micropower sleep state |
| Dual independent shutdown controls | Enables selective power gating of 3.3V or 5V rail-reducing system idle power without firmware intervention |
| 100% duty cycle low-dropout mode | Eliminates need for LDO post-regulation when VIN approaches VOUT-reduces BOM count and thermal overhead |
| Constant off-time current-mode control | Delivers <10µs load transient recovery with no external compensation-simplifies layout and validation |
| Wide 3.5V–16V input range | Supports single-supply operation from Li-ion (3.0–4.2V), 5V USB, 12V wall adapters, and automotive 12V batteries |
Applications
| Notebook Computers | Palmtop PDAs |
|---|---|
Use Scenario: Dual-rail core logic and I/O supply in ultra-thin clamshell notebooks with shared battery and thermal envelope. IC Role / Device Role / Timing Role: Primary DC-DC controller generating 3.3V for memory/SRAM and 5V for USB peripherals and display backlight drivers. Use Value: 95% peak efficiency extends runtime by >12% versus legacy controllers; independent shutdown enables OS-driven rail sequencing during suspend/resume. | Use Scenario: Compact handheld organizer requiring simultaneous 3.3V microcontroller core and 5V interface voltage from single-cell Li-ion. IC Role / Device Role / Timing Role: Dual-output buck controller managing power conversion and dynamic rail enablement under real-time OS scheduling. Use Value: 160µA per-regulator sleep current enables >14-day standby; Burst Mode maintains regulation at sub-5mA loads without audible noise. |
| Battery-Operated Instruments | Portable Medical Devices |
Use Scenario: Handheld multimeter or oscilloscope with isolated analog front-end and digital processing subsystem. IC Role / Device Role / Timing Role: High-efficiency dual-buck controller powering precision ADC/DAC analog rails (3.3V) and FPGA/microcontroller digital domains (5V). Use Value: Low output ripple (<50mVP-P in Burst Mode) prevents measurement noise coupling; 100% duty cycle avoids brownout during battery sag. | Use Scenario: Portable ECG monitor with Bluetooth LE connectivity and rechargeable LiPo battery. IC Role / Device Role / Timing Role: Power management IC delivering regulated 3.3V for sensor signal chain and 5V for BLE radio module with independent enable control. Use Value: Independent shutdown of 5V BLE rail during sleep reduces total system quiescent current to <200µA-extending battery life beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703-5 | Single-output synchronous buck controller; 5V fixed output; no 3.3V channel; requires external MOSFETs | Only suitable when system needs one regulated rail; lacks dual-channel integration and independent shutdown | Select only if design requires higher current (>5A) on 5V rail and can accept discrete 3.3V generation |
| TPS54228 | Integrated dual-output synchronous buck converter (no external FETs); 3.3V/5V programmable via resistor; lower max input (18V) | Higher integration but fixed 2A per channel; no 100% duty cycle; less flexible for high-current or low-noise designs | Prefer when board space is critical and output currents ≤2A; avoid if low-dropout or external FET optimization is required |
Compared with LTC1143CS#TRPBF, LTC3703-5 offers higher single-rail current capability but sacrifices dual-rail integration and independent control, while TPS54228 reduces external component count at the cost of fixed current limits and no true low-dropout mode-making LTC1143CS#TRPBF optimal for flexible, high-efficiency dual-rail systems with variable load profiles.
Availability
LTC1143CS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, palmtop PDAs, and battery-operated instruments requiring stable component supply with long-term industrial availability.
Supply support for LTC1143CS#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.
The LTC1143 series belongs to Linear's legacy high-efficiency DC-DC controller product line, designed specifically for dual-output, battery-powered portable electronics where efficiency across wide load ranges and minimal quiescent current are critical.
FAQ
What output voltages does the LTC1143CS#TRPBF provide?
The LTC1143CS#TRPBF provides fixed 3.3V and 5V outputs. These are internally trimmed and do not require external feedback resistors-unlike the LTC1143L-ADJ variant. Each output is generated by an independent regulator block with dedicated current sensing, timing, and shutdown control, enabling precise dual-rail power management in portable systems.
Does the LTC1143CS#TRPBF support 100% duty cycle operation?
Yes, the LTC1143CS#TRPBF supports 100% duty cycle operation to maintain regulation during low input-to-output differentials. This low-dropout behavior is enabled automatically when VIN approaches VOUT and is limited only by the RDS(ON) of the external P-channel MOSFET, inductor DCR, and current sense resistor-eliminating the need for post-regulation LDOs in battery-sag scenarios.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1143CS#TRPBF?
Burst Mode™ in the LTC1143CS#TRPBF reduces quiescent current to 160µA per regulator block by disabling switching and entering micropower sleep state when load falls below ~15mA. The device wakes periodically to sample output voltage and resumes switching only if regulation error exceeds hysteresis-maintaining tight regulation while achieving ≥85% efficiency down to 1mA per channel.
What is the maximum input voltage rating for the LTC1143CS#TRPBF?
The absolute maximum input voltage for the LTC1143CS#TRPBF is 16V on Pins 5 (VIN2) and 13 (VIN1). Operation is specified over 3.5V to 16V, making it compatible with single-cell Li-ion (up to 4.2V), 5V USB, 12V wall adapters, and automotive 12V systems with transient protection. Exceeding 16V risks permanent damage to internal circuitry.
Can the LTC1143CS#TRPBF drive N-channel MOSFETs?
No, the LTC1143CS#TRPBF is designed exclusively for external P-channel MOSFETs. Its P-DRIVE outputs (Pins 4 and 12) swing from VIN to GND, providing gate drive referenced to the high-side switch source. Driving N-channel devices would require bootstrap or isolated gate drive circuitry not supported by the LTC1143CS#TRPBF architecture.
LTC1143CS#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):
- 4V ~ 14V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- 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
LTC1143CS#TRPBF FAQ
1.How can I place an order for LTC1143CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1143CS#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 LTC1143CS#TRPBF reliable?
The price and inventory of LTC1143CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1143CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1143CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1143CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1143CS#TRPBF?
LTC1143CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1143CS#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 LTC1143CS#TRPBF?
For technical support, including LTC1143CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1143CS#TRPBF requirements.
6.How does Aetrix verify that LTC1143CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1143CS#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 LTC1143CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1143CS#TRPBF?
All LTC1143CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1143CS#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 LTC1143CS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1143CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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