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Analog Devices Inc. LTC1479CG#TRPBF
- Part No.:
- LTC1479CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1479CG#TRPBF.pdf
- Description:
- IC BAT PWR MGMT MULT-CHEM 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
LTC1479CG#TRPBF from Analog Devices (formerly Linear Technology) is a dual-battery PowerPath™ controller IC that manages seamless power routing among DCIN, BAT1, BAT2, and VBKUP sources using all-N-channel MOSFET switches. It delivers 36.5V gate drive (VGG), supports 6–28V input ranges per source, limits inrush current via ±200mV SENSE+/- threshold, and enables "3-Diode" cold-start operation for notebook computers.
For engineers reviewing the LTC1479CG#TRPBF datasheet, LTC1479CG#TRPBF pinout, LTC1479CG#TRPBF application, or LTC1479CG#TRPBF equivalent, this page provides verified technical context on adaptive current limiting, independent battery charging control, UVLO hysteresis (0.2–1.0V), VCCP/VCC dual-regulator outputs, and 36-lead SSOP package integration with external Si4936DY-compatible MOSFETs.
Technical Context
The LTC1479CG#TRPBF implements adaptive bidirectional inrush limiting by monitoring RSENSE voltage across SW A/B, C/D, and E/F switch pairs - clamping VGS until ±200mV threshold is cleared. Its VGG boost regulator (30kHz, ~36.5V) draws power from internal diodes tied to DCIN/BAT1/BAT2, ensuring full enhancement of N-channel switches up to 28V.
Control logic interprets five digital inputs (BATSEL, CHGSEL, BATDIS, DCIN/BAT, 3DM) to select operating mode (11 defined), manage break-before-make switching for SW G/H during battery charging, and assert open-drain outputs DCINGOOD (1.215V DCDIV threshold) and LOBAT (1.215V BDIV falling-edge threshold) with 5µs response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 28V per source (DCIN, BAT1, BAT2, VBKUP) - enables compatibility with Li-ion, NiMH, lead-acid, and 24V adapter systems. |
| VGG Gate Supply | 36.5V regulated output - provides sufficient overdrive headroom for logic-level N-MOSFETs at max 28V rail. |
| Inrush Sense Threshold | ±200mV across RSENSE - enables precise bidirectional current limiting during source transitions without external op-amps. |
| UVLO Threshold & Hysteresis | 4.5V nominal UVLO with 0.5V typical hysteresis - prevents oscillation during brownout recovery and ensures stable startup. |
| DCIN/BAT Monitor Accuracy | 1.215V DCDIV threshold ±25mV - guarantees reliable AC adapter presence detection before system power-up. |
| Low-Battery Detection | 1.215V BDIV falling-edge threshold ±25mV - triggers LOBAT assertion to initiate graceful shutdown or battery switchover. |
| Gate Drive Timing | 30µs turn-on (GA–GF), 300µs turn-on (GG/GH) - supports controlled sequencing for charger/battery isolation and backup activation. |
Pinout & Package
Package: 36-lead plastic SSOP (209 mils), RoHS-compliant, surface-mountable with 0.025" pitch. Thermal resistance θJA = 95°C/W; rated for 0°C to 70°C ambient (LTC1479CG grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | Primary DC supply input | Accepts 6–28V adapter input; requires 330Ω series resistor and 0.1µF local bypass for ESD/transient protection. |
| DCDIV (2) | DC input monitor reference | High-Z comparator input with 1.215V rising-edge threshold - used with external resistor divider to detect valid DC source. |
| LOBAT (3) | Low-battery indicator output | Open-drain active-low signal asserting when selected battery voltage falls below 1.215V × (R1+R2)/R2. |
| GA/GB (4,6) | DCIN switch gate drivers | Drive back-to-back N-MOSFETs (SW A/B); enable "3-Diode" mode when only GA is active under cold-start conditions. |
| SAB (5) | DCIN switch source return | Pull-down node tied to sources of SW A/B - ensures safe discharge of gate capacitance when switches are off. |
| BAT1/BAT2 (35,34) | Secondary power inputs | Accept 6–28V battery packs; each requires 1µF local bypass if no bulk capacitor is within 2 inches. |
| VCCP (20) | 5V logic supply output | Regulated ~4.8V output powering core logic; requires ≥0.1µF ceramic bypass for stability. |
| VCC (15) | 3.6V gate-control supply | Nominal 3.6V output powering VGG regulator control circuitry; requires 2.2µF tantalum capacitor for loop stability. |
| VGG (16) | 36.5V gate drive supply | Boost-regulated high-voltage rail - must not be loaded externally; bypassed with 1µF/50V capacitor. |
| CHGMON (31) | Battery selection feedback | Switches BAT1/BAT2 to charger feedback resistors - ensures accurate voltage regulation during charging of selected pack. |
Key Features
| Feature | Design Value |
|---|---|
| All-N-channel switching topology | Reduces conduction loss vs. P-channel alternatives and enables use of lower-RDS(on), cost-effective MOSFETs like Si4936DY. |
| Adaptive inrush current limiting | Clamps gate drive during transitions using ±200mV SENSE+/- sensing - eliminates need for external current-sense amps or complex timing circuits. |
| "3-Diode" cold-start mode | Activates only first MOSFET in each pair (e.g., SW A, C, E) to leverage body diodes - restores system power when all supplies are deeply discharged. |
| Independent dual-battery management | Allows simultaneous charging of one battery while discharging the other - critical for hot-swap battery operation in notebooks. |
| Integrated dual-regulator power system | VCCP (~4.8V) powers logic; VCC (~3.6V) powers gate control - eliminates need for external LDOs and simplifies BOM. |
Applications
| Notebook Computer Power Management | Portable Medical Equipment |
|---|---|
Use Scenario: Dual-battery notebook with AC adapter priority, runtime extension via hot-swap battery, and graceful shutdown during low-battery condition. IC Role / Device Role / Timing Role: Front-end power router controlling SW A/B (DCIN), SW C/D (BAT1), SW E/F (BAT2), and SW G/H (charger path) under µP supervision. Use Value: Enables seamless source handoff with <5µs LOBAT delay and eliminates voltage droop during adapter insertion/removal. | Use Scenario: Portable ultrasound or infusion pump requiring uninterrupted operation during battery replacement without system reset. IC Role / Device Role / Timing Role: Dual-battery supervisor managing backup switchover (VBKUP), battery health monitoring (BDIV), and charger isolation (CHGSEL). Use Value: Supports "3-Diode" mode to restart system from 0V battery state - meets IEC 60601-1 requirement for fail-safe power continuity. |
| Handheld Industrial Terminal | Portable Instrumentation |
Use Scenario: Ruggedized handheld terminal used in field service with interchangeable Li-ion packs and 24V vehicle adapter input. IC Role / Device Role / Timing Role: Power arbitrator selecting between DCIN (24V), BAT1 (12.6V), BAT2 (12.6V), and VBKUP (3.3V coin cell) based on real-time voltage and µP commands. Use Value: Delivers 200mV-accurate inrush limiting - allows use of compact 100µF tantalum input capacitors instead of bulky 470µF electrolytics. | Use Scenario: Battery-powered oscilloscope or spectrum analyzer needing >8-hour runtime with dual 18650 packs and fast-charge capability. IC Role / Device Role / Timing Role: Dual-battery sequencer coordinating charging (LT1511), monitoring (LOBAT/DCINGOOD), and load-switching (SW A/B–E/F) via SPI-connected µP. Use Value: Provides independent VBAT sense (pin 32) and BDIV comparator - enables per-battery state-of-charge estimation without additional ADC channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-battery power-path control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4412EMS#TRPBF | Single-path ideal diode controller; no dual-battery arbitration, no charger interface, no VGG boost regulator. | Only suitable for OR-ing two sources (e.g., DCIN + single battery), not for notebook-style dual-battery + charger + backup topologies. | Select only if system uses only one battery and requires ultra-low quiescent current (15µA vs. 175µA). |
| TPS2113APW | Auto-switching dual-input power mux; lacks battery-specific features (BATSEL, CHGSEL, BDIV), no inrush limiting, no backup supply support. | Applicable to DCIN + single battery systems where charger coordination and cold-start recovery are not required. | Choose when cost sensitivity outweighs need for battery health monitoring and seamless multi-source arbitration. |
Compared with LTC4412EMS#TRPBF and TPS2113APW, the LTC1479CG#TRPBF uniquely integrates dual-battery selection, charger interface, "3-Diode" cold-start, and adaptive inrush limiting - making it irreplaceable in notebook-class portable equipment requiring coordinated power-path control.
Availability
LTC1479CG#TRPBF is available at Aetrix Electronics and suitable for notebook computer power management, portable medical equipment, handheld industrial terminals, and portable instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LTC1479CG#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1479CG#TRPBF belongs to Linear's PowerPath™ controller family, designed specifically for intelligent front-end power routing in dual-battery portable systems - emphasizing seamless source arbitration, low-loss N-MOSFET control, and robust cold-start recovery.
FAQ
What is the primary function of the LTC1479CG#TRPBF in a dual-battery system?
The LTC1479CG#TRPBF serves as the central power-path controller that intelligently routes power among DCIN, BAT1, BAT2, and VBKUP sources using external N-channel MOSFETs. It enables seamless transitions, independent battery charging, low-battery detection, and "3-Diode" cold-start recovery - all coordinated via a companion microprocessor. The LTC1479CG#TRPBF is essential for maintaining continuous operation in notebook-class portable devices.
Does the LTC1479CG#TRPBF integrate its own gate drivers and power supplies?
Yes, the LTC1479CG#TRPBF integrates dual regulated power supplies: VCCP (~4.8V) for logic and VCC (~3.6V) for gate control circuitry, plus a dedicated 36.5V VGG boost regulator for driving N-channel MOSFET gates. It also embeds eight gate drivers (GA–GH) and bidirectional inrush limiting circuitry - eliminating need for external regulators, drivers, or current-sense amplifiers. This integration is intrinsic to the LTC1479CG#TRPBF architecture.
How does the "3-Diode" mode work in the LTC1479CG#TRPBF, and when is it activated?
The "3-Diode" mode in the LTC1479CG#TRPBF activates when the 3DM pin is pulled low, forcing only the first MOSFET in each back-to-back pair (SW A, C, E) to turn on - allowing current flow through their inherent body diodes. This mode enables system restart from zero-voltage battery conditions (cold start). It is triggered automatically during Mode 10 (DC restoration) or manually via µP control of the 3DM pin. The LTC1479CG#TRPBF relies on this feature for fail-safe recovery in portable equipment.
Can the LTC1479CG#TRPBF monitor and charge both batteries simultaneously?
No - the LTC1479CG#TRPBF supports independent monitoring of both batteries (via BDIV and VBAT pins) but only charges one battery at a time, selected by the CHGSEL input. When CHGSEL = high, BAT1 is connected to the charger via SW G; when low, BAT2 is connected via SW H. Break-before-make switching prevents cross-conduction. The LTC1479CG#TRPBF enables concurrent discharge of one battery while charging the other, but not simultaneous charging of both.
What external components are mandatory for basic operation of the LTC1479CG#TRPBF?
Mandatory external components for the LTC1479CG#TRPBF include: (1) 0.1µF ceramic capacitor on DCIN, (2) 1µF capacitors on BAT1/BAT2/VBKUP, (3) 2.2µF tantalum on VCC, (4) 1µF/50V on VGG, (5) 1µF/35V on V+, (6) 1mH inductor and 1µF/50V capacitor for VGG boost stage, and (7) precision resistor dividers on DCDIV and BDIV for voltage monitoring. These are specified in the LTC1479CG#TRPBF datasheet and cannot be omitted.
LTC1479CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Power Management
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- Over Current
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1479CG#TRPBF FAQ
1.How can I place an order for LTC1479CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1479CG#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 LTC1479CG#TRPBF reliable?
The price and inventory of LTC1479CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1479CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1479CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1479CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1479CG#TRPBF?
LTC1479CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1479CG#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 LTC1479CG#TRPBF?
For technical support, including LTC1479CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1479CG#TRPBF requirements.
6.How does Aetrix verify that LTC1479CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1479CG#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 LTC1479CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1479CG#TRPBF?
All LTC1479CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1479CG#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 LTC1479CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1479CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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