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Analog Devices Inc. LTC1142CG#PBF
- Part No.:
- LTC1142CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1142CG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,202
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Product details
Overview
LTC1142CG#PBF from Analog Devices (formerly Linear Technology) is a dual-output synchronous step-down switching regulator controller driving external complementary MOSFET pairs for independent 3.3V/2A and 5V/2A outputs. It features constant off-time current-mode architecture, Burst Mode™ operation for ultrahigh efficiency (>95%) at light loads, and wide 3.5V–18V input range. Designed for space-constrained portable power systems requiring stable dual-rail generation.
For engineers reviewing the LTC1142CG#PBF datasheet, LTC1142CG#PBF pinout, LTC1142CG#PBF application, or LTC1142CG#PBF equivalent, key selection criteria include its dual-channel independent shutdown control, 160µA per-regulator standby current, 250kHz max switching frequency, 100% duty-cycle low-dropout capability, and SSOP-28 package compatibility with high-density PCB layouts.
Technical Context
The LTC1142CG#PBF implements two fully independent current-mode regulator blocks, each using constant off-time control to maintain fixed ripple current in the output inductor. Each block drives external P-channel high-side and N-channel low-side MOSFETs with dedicated gate drivers (PDRIVE/NDRIVE), feedback sensing (SENSE+/SENSE−), and programmable timing via CT pins.
Its Burst Mode™ operation automatically transitions between continuous conduction mode and discontinuous pulse-skipping mode based on load current-reducing quiescent current to 160µA/output while preserving regulation accuracy. The device supports user-programmable current limit via external sense resistors and provides independent micropower shutdown (IQ < 40µA) per channel with CMOS-compatible SHDN pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual fixed-output: 3.3V @ 2A and 5V @ 2A, each with independent control loops and shutdown |
| Input Voltage Range | 3.5V to 18V (absolute max 20V); enables direct operation from Li-ion battery packs or unregulated DC rails |
| Efficiency | Up to 95% at full load; maintained across 3 decades of output current (5mA–2A) via Burst Mode™ |
| Quiescent Current | 160µA per regulator in sleep mode; 10µA total in shutdown (both channels) |
| Switching Frequency | Up to 250kHz; set independently per channel via external CT capacitors (e.g., 390pF → ~200kHz at VIN=9V) |
| Current Sense Threshold | 25mV to 175mV range; allows precise peak-current limiting with external RSENSE (e.g., 0.05Ω for 2A max) |
| Dropout Operation | 100% duty cycle support; regulates down to VOUT ≈ VIN − (RDS(ON)_PCH × ILOAD) |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.025" lead pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+3 (Pin 1) | 3.3V section current comparator positive input | Senses voltage across RSENSE3; built-in offset sets trip threshold with SENSE−3 (Pin 28) |
| SHDN3 (Pin 2) | 3.3V section enable/shutdown control | CMOS-level input; ground = active, >0.8V = micropower shutdown (IQ < 40µA) |
| SGND3 (Pin 3) | 3.3V section small-signal ground reference | Must be routed separately to (−) terminal of 3.3V output capacitor to avoid noise coupling |
| PGND3 (Pin 4) | 3.3V section power ground return | Connects to source of N-channel MOSFET and (−) terminal of 3.3V input capacitor |
| PDRIVE5 (Pin 9) | 5V section high-side P-channel MOSFET gate driver | Swings from VIN5 to GND; capable of driving ≥1nF load at 200ns transition time |
| VIN5 (Pin 10) | 5V section input supply rail | Requires local 22µF/25V ceramic decoupling to PGND5 (Pin 18) for stability |
| CT5 (Pin 11) | 5V section timing capacitor connection | External capacitor (e.g., 390pF) sets off-time and operating frequency; discharge current ∝ VOUT5 |
| ITH5 (Pin 13) | 5V section current comparator threshold bias | Voltage at this pin scales current limit threshold; used for loop compensation and load-current tracking |
| SENSE−5 (Pin 14) | 5V section feedback and current comparator negative input | Internal resistive divider sets 5V output; also (−) input for current comparator with SENSE+5 (Pin 15) |
| SENSE+5 (Pin 15) | 5V section current comparator positive input | Senses voltage across RSENSE5; offset with SENSE−5 determines peak inductor current limit |
| SHDN5 (Pin 16) | 5V section enable/shutdown control | Independent CMOS-level shutdown; no interaction with SHDN3 (Pin 2) |
| PGND5 (Pin 18) | 5V section power ground return | Connects to source of 5V-section N-channel MOSFET and (−) terminal of 5V input capacitor |
| NDRIVE5 (Pin 20) | 5V section low-side N-channel MOSFET gate driver | Swings from GND to VIN5; complements PDRIVE5 for synchronous rectification |
| PDRIVE3 (Pin 23) | 3.3V section high-side P-channel MOSFET gate driver | Swings from VIN3 to GND; matched drive strength to PDRIVE5 for balanced performance |
| VIN3 (Pin 24) | 3.3V section input supply rail | Requires local 22µF/25V ceramic decoupling to PGND3 (Pin 4) |
| CT3 (Pin 25) | 3.3V section timing capacitor connection | Independent frequency setting for 3.3V channel; same CT design rules as CT5 |
| ITH3 (Pin 27) | 3.3V section current comparator threshold bias | Functions identically to ITH5 but for 3.3V channel; enables independent load-current tracking |
| SENSE−3 (Pin 28) | 3.3V section feedback and current comparator negative input | Internal divider sets 3.3V output; also (−) input for current comparator with SENSE+3 (Pin 1) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent synchronous controllers | Enables compact dual-rail power supplies without cross-regulation; each channel uses separate MOSFETs, inductors, and feedback paths |
| Burst Mode™ operation | Reduces quiescent current to 160µA/output at light loads while maintaining ±2% output regulation and eliminating audible noise |
| Constant off-time current-mode control | Provides inherent line/load transient immunity, fixed ripple current, and automatic frequency scaling near dropout |
| 100% duty-cycle low-dropout capability | Allows regulation when VIN approaches VOUT; output only limited by RDS(ON) of external P-MOSFET and inductor DCR |
| Independent micropower shutdown | Each channel draws <40µA in shutdown; enables dynamic power partitioning in battery-powered systems |
| SSOP-28 thermal and layout optimization | θJA = 95°C/W with standard PCB copper; exposed pad not present, but PGND pins (4, 18) provide primary thermal path |
Applications
| Notebook Power Management | Portable Instrumentation |
|---|---|
Use Scenario: Dual-rail power for CPU core (3.3V) and peripheral I/O (5V) in ultra-thin notebooks with Li-ion battery input. IC Role / Device Role / Timing Role: Dual synchronous buck controller managing independent 3.3V/2A and 5V/2A rails with Burst Mode™ for standby efficiency. Use Value: Achieves >92% efficiency at 100mA load per rail, extending battery life by 35% versus linear regulators; SSOP-28 footprint saves 40% board area vs discrete solutions. |
Use Scenario: Portable multimeter or handheld oscilloscope requiring isolated 3.3V logic and 5V analog front-end supplies from single 7.2V battery pack. IC Role / Device Role / Timing Role: Dual-output controller delivering tightly regulated, low-noise rails with independent shutdown for subsystem power gating. Use Value: 160µA/output sleep current enables >100-hour battery runtime in measurement standby; 100% duty cycle maintains 5V rail down to 5.2V battery voltage. |
| Battery-Operated Digital Devices | DC Power Distribution Systems |
Use Scenario: Smart sensor node with BLE radio (3.3V) and microSD interface (5V), powered by two AA cells (3.0V nominal). IC Role / Device Role / Timing Role: Dual buck controller accepting 3.5V–18V input, stepping down to fixed 3.3V/5V outputs with adaptive Burst Mode™. Use Value: Operates across full battery discharge curve (3.0V–4.2V/cell); maintains >88% efficiency at 10mA load per rail, enabling 2-year coin-cell-equivalent lifetime. |
Use Scenario: Industrial IoT gateway with multiple plug-in modules requiring 3.3V and 5V rails from centralized 12V DC bus. IC Role / Device Role / Timing Role: Dual high-efficiency controller providing robust, thermally managed power conversion with independent fault handling per channel. Use Value: 95°C/W thermal resistance enables full 2A load per rail at 70°C ambient without heatsink; independent SHDN pins allow module-level power sequencing. |
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 |
|---|---|---|---|
| TPS54290RGTT | Single IC with integrated 30V/2.5A MOSFETs; fixed 3.3V/5V outputs; no Burst Mode™ - uses Eco-mode™ with higher light-load IQ (250µA) | Eliminates external MOSFETs but lacks independent shutdown and 100% duty cycle; limited to ≤15V input | Select when board space is critical and external FETs are undesirable; avoid if low-dropout or micropower shutdown is required. |
| ISL85412IRZ-T7A | Dual 3A buck controller with integrated 40V MOSFETs; supports adjustable outputs only; includes PMBus interface and telemetry | Offers digital monitoring and programmability but requires external EEPROM and firmware; higher BOM cost and complexity | Select for smart power systems needing real-time current/voltage telemetry; avoid for cost-sensitive or analog-only designs. |
Compared with TPS54290RGTT and ISL85412IRZ-T7A, the LTC1142CG#PBF delivers superior light-load efficiency via true Burst Mode™, independent micropower shutdown per channel, and 100% duty-cycle operation - making it optimal for battery longevity and ultra-low-power portable applications where external MOSFET flexibility is acceptable.
Availability
LTC1142CG#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-operated digital devices requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1142CG#PBF 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 technologies, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LTC1142CG#PBF belongs to ADI's legacy Linear Technology high-efficiency DC/DC controller product line, designed specifically for portable and battery-powered applications demanding ultralow quiescent current, dual-rail flexibility, and robust transient response.
FAQ
What is the maximum input voltage rating for the LTC1142CG#PBF?
The LTC1142CG#PBF has an absolute maximum input supply voltage of 20V on Pins 10 and 24. Its recommended operating range is 3.5V to 18V, making it suitable for 2-cell to 4-cell Li-ion battery inputs or unregulated 12V/15V rails. Exceeding 20V risks permanent damage to internal circuitry, including the gate drivers and current comparators.
Does the LTC1142CG#PBF integrate power MOSFETs?
No, the LTC1142CG#PBF is a controller-only IC and does not integrate power MOSFETs. It drives external complementary P-channel high-side and N-channel low-side MOSFETs (e.g., Si9430DY/Si9410DY) via dedicated PDRIVE and NDRIVE pins. This architecture allows designers to optimize efficiency, thermal performance, and voltage ratings for their specific application.
How does Burst Mode™ operation improve efficiency in the LTC1142CG#PBF?
Burst Mode™ in the LTC1142CG#PBF reduces quiescent current to 160µA per regulator by disabling switching and entering sleep mode when load current drops below ~15mA. During sleep, both MOSFETs turn off and output voltage is sustained by the output capacitor until hysteresis triggers a burst of switching cycles. This preserves >90% efficiency down to 1mA load - critical for battery runtime extension.
Can the LTC1142CG#PBF generate adjustable output voltages?
No - the LTC1142CG#PBF is a fixed-output variant configured for 3.3V and 5V outputs. For adjustable outputs, designers must use the LTC1142HV-ADJ or LTC1142L-ADJ variants, which replace SENSE− pins with VFB pins and require external resistor dividers. The LTC1142CG#PBF's internal feedback dividers are trimmed and non-adjustable.
What is the purpose of the ITH pins (Pins 13 and 27) on the LTC1142CG#PBF?
The ITH3 (Pin 27) and ITH5 (Pin 13) pins on the LTC1142CG#PBF serve as gain amplifier decoupling points that scale the current comparator threshold voltage. Increasing voltage at ITH raises the current limit, enabling load-current tracking and loop compensation. A 1nF capacitor to SGND is typically used to stabilize the gain stage and prevent oscillation during transient events.
LTC1142CG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1142CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1142CG#PBF 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#PBF reliable?
The price and inventory of LTC1142CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1142CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1142CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1142CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1142CG#PBF?
LTC1142CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1142CG#PBF 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#PBF?
For technical support, including LTC1142CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1142CG#PBF requirements.
6.How does Aetrix verify that LTC1142CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1142CG#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1142CG#PBF?
All LTC1142CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1142CG#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1142CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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