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Analog Devices Inc. LTC4091EDJC#PBF
- Part No.:
- LTC4091EDJC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 22-WFDFN Exposed Pad
- Datasheet:
-
LTC4091EDJC#PBF.pdf
- Description:
- IC BATT CHG LI-ION 22DFN
- Quantity:
- Payment:
- Shipping:
Inventory:372
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Product details
Overview
LTC4091EDJC#PBF from Analog Devices is a 36V input, 2A step-down Li-ion battery charger and power backup manager with integrated 75mΩ ideal diode, adaptive output tracking (VBAT + 0.1V), 4.45V max output voltage, and pin-selectable 4.1V/4.2V charge voltage - used in automotive telematics and GPS data loggers requiring seamless primary-to-battery switchover.
For engineers reviewing the LTC4091EDJC#PBF datasheet, LTC4091EDJC#PBF pinout, LTC4091EDJC#PBF application, or LTC4091EDJC#PBF equivalent, key selection criteria include its 6–36V wide input range, thermal regulation up to 125°C junction temperature, NTC-based battery temperature monitoring, programmable charge current (up to 1.5A), and 22-lead DFN package with exposed thermal pad.
Technical Context
The LTC4091EDJC#PBF integrates a constant-frequency current-mode buck regulator with adaptive output control that maintains HVOUT ≈ VBAT + 100mV for high-efficiency charging, while its internal ideal diode enables sub-100mV dropout (25mV turn-on threshold) during battery backup. It implements CC/CV charging with programmable termination timer, trickle-charge recovery for deeply discharged cells (<2.9V), and thermal foldback limiting.
Its dual-path power management uses an internal bipolar NPN switch driven by BOOST voltage (≥VIN + 1.5V) and supports optional external P-channel MOSFET control via GATE pin. The device features dedicated pins for NTC thermistor biasing (VNTC), fault detection (VCOLD/VHOT thresholds), and high-voltage presence indication (HVPR active-low).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 36V (60V absolute max); supports automotive cold-crank and industrial 24V systems without external protection. |
| Max Output Voltage | 4.45V; limits downstream load overvoltage risk in Li-ion backup applications. |
| Charge Voltage Options | PIN-selectable 4.1V or 4.2V; accommodates different Li-ion chemistries and longevity vs. capacity trade-offs. |
| Internal Ideal Diode RON | 75mΩ at 2A; enables low-loss battery-to-load conduction with <40mV forward drop at 1A. |
| Switching Frequency | 160kHz to 2.4MHz (RT-programmable); allows optimization of size vs. efficiency in high-density layouts. |
| Thermal Regulation Threshold | 105°C junction temperature; dynamically reduces charge current to prevent overheating in enclosed enclosures. |
| NTC Monitoring Accuracy | VNTC = 4.4–4.85V bias; supports ±1µA leakage tolerance for reliable hot/cold fault detection across temperature ranges. |
Pinout & Package
Package: 22-lead (6mm × 3mm) plastic DFN with exposed thermal pad (Pin 23 = GND), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock synchronization input | Allows frequency locking to system master clock; must be grounded if unused to avoid noise coupling. |
| VINGD (2) | Open-collector VIN-good indicator | Signals when VIN is sufficient to enable regulator; requires external pull-up for logic-level interface. |
| RT (3) | Oscillator frequency setting resistor | Resistor to GND sets switching frequency from 160kHz to 2.4MHz; critical for EMI control and inductor sizing. |
| VC (4) | Buck regulator peak-current control node | RC compensation point for loop stability; clamped to RUN/SS for soft-start ramp generation. |
| NTC (5) | Negative temperature coefficient thermistor input | Monitors battery pack temperature; triggers charge pause if outside safe range (e.g., <0°C or >45°C). |
| VNTC (6) | NTC bias voltage source | Provides stable 4.4–4.85V reference for thermistor divider; low-drift requirement ensures accuracy. |
| HVPR (7) | High-voltage present status (open-drain) | Active-low signal confirms primary input availability; used for system-level power-source arbitration. |
| CHRG (8) | Charge status indicator (open-drain) | Pulled low during active charging; high-impedance at end-of-charge or fault - no external pull-up needed. |
| PROG (9) | Charge current programming node | Resistor to GND sets ICHG = 52.5kΩ / RPROG; 1% metal film recommended for ±5% current accuracy. |
| GATE (10) | External ideal diode FET driver | Drives gate of external P-MOSFET (source=OUT, drain=BAT); enables <20mV forward drop with SiA433EDJ. |
| BAT (11,12) | Li-ion battery terminal | Shared path for charging (source) and backup supply (sink); precision internal divider sets final charge voltage. |
| OUT (13) | System load output | Delivers regulated power from VIN or BAT; requires ≥68µF ceramic + bulk capacitance for transient response. |
| V4P1 (14) | 4.1V charge voltage select | Connect to BAT for 4.1V mode; leave open for 4.2V - leakage-sensitive node requiring guard ring layout. |
| GND (15) | Analog/digital ground reference | Common return for all circuits; ties to exposed pad (Pin 23) for thermal and electrical integrity. |
| NC (16) | No connect | Internally unconnected; must remain floating - no routing or stitching vias allowed. |
| TIMER (17) | Charge termination timing capacitor | CTIMER to GND sets duration: tTIMER(hr) = CTIMER(F) × RPROG(Ω) × 300; shorting to GND disables charging. |
| HVOUT (18) | High-voltage regulator output | Drives battery charger FET; maintained ~100mV above BAT for minimal dropout loss during charging. |
| BOOST (19) | Bootstrap drive voltage generator | Capacitor to SW provides >VIN voltage to fully saturate internal NPN switch; 0.22–1µF required. |
| SW (20) | Internal switch node | Connects to inductor, catch diode, and BOOST cap; high dv/dt node requiring tight layout and ground plane. |
| VIN (21) | Main input supply | Accepts 6–36V; local bypassing mandatory - typical 10µF ceramic + bulk electrolytic near pin. |
| RUN/SS (22) | Regulator enable & soft-start control | ≥3V enables operation; RC network here generates controlled startup ramp to limit inrush current. |
| GND (23) | Exposed thermal pad | Mandatory solder connection to PCB ground plane with ≥4 thermal vias for θJA = 31.8°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Output Tracking | Maintains HVOUT = VBAT + 100mV during charging, minimizing power loss in battery FET and maximizing system efficiency. |
| Integrated 75mΩ Ideal Diode | Enables seamless battery backup with <40mV forward drop at 1A, eliminating need for external Schottky diodes and associated losses. |
| Programmable Charge Current | Set from 465mA to 1.5A via single PROG resistor; supports fast recharge while avoiding cell stress in compact designs. |
| NTC-Based Thermal Safety | Detects battery temperature faults using VNTC bias and VCOLD/VHOT thresholds, pausing charge until safe range is restored. |
| Trickle-Charge Recovery | Automatically applies 10% full-current to batteries below 2.9V, preventing damage from deep discharge before CC/CV phase begins. |
| Wide-Temperature Operation | Specified from –40°C to 125°C junction temperature, enabling use in under-hood automotive and industrial environments. |
Applications
| Automotive Telematics Systems | Fleet and Asset Tracking |
|---|---|
Use Scenario: Continuous GNSS location reporting in commercial vehicles during engine-off periods. IC Role / Device Role / Timing Role: Power backup manager ensuring uninterrupted 3.3V/5V rail to MCU and cellular modem during ignition cycling. Use Value: Seamless transition prevents GPS data gaps and preserves real-time asset visibility without supercapacitor or large battery banks. | Use Scenario: Remote sensor nodes on shipping containers logging temperature, shock, and door status over multi-week deployments. IC Role / Device Role / Timing Role: Dual-role Li-ion charger and load switch managing energy harvesting input and battery reserve. Use Value: 4.1V charge option extends cycle life; 75mΩ ideal diode minimizes self-discharge during long idle intervals. |
| Automotive GPS Data Loggers | Battery Backup Systems |
Use Scenario: Event-triggered crash reconstruction loggers capturing pre-impact vehicle dynamics. IC Role / Device Role / Timing Role: High-reliability power path controller maintaining volatile RAM and flash write buffers during sudden main power loss. Use Value: Sub-100µs ideal diode response prevents data corruption; 4.45V output limit protects sensitive ADCs and RF front-ends. | Use Scenario: Industrial PLCs requiring continuous operation during AC mains failure or brownouts. IC Role / Device Role / Timing Role: Primary-to-battery switchover supervisor with programmable charge timer and thermal derating. Use Value: 105°C thermal regulation prevents shutdown in hot control cabinets; HVPR pin enables system-level power-fail signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery backup and charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17710G+T | Lower 28V max input; integrated 100mΩ ideal diode; no NTC input; fixed 4.2V charge. | Suited for space-constrained wearables but lacks automotive-grade temp range and thermal regulation. | Select MAX17710G+T only for low-power, non-automotive applications where NTC monitoring and wide VIN are unnecessary. |
| BQ25619RGER | 4.5A max charge current; I²C programmable; 3.5–16V input; no internal ideal diode; requires external PFET for backup path. | Offers greater flexibility in charge profile tuning but adds complexity and board area for backup FET and gate driver. | Choose BQ25619RGER when system-level firmware control and higher charge rates outweigh simplicity and integrated backup path. |
Compared with MAX17710G+T and BQ25619RGER, the LTC4091EDJC#PBF delivers superior automotive readiness via its 36V input rating, –40°C to 125°C operation, integrated NTC interface, and monolithic ideal diode - reducing BOM count and layout risk in mission-critical backup systems.
Availability
LTC4091EDJC#PBF is available at Aetrix Electronics and suitable for automotive telematics, fleet tracking, and industrial battery backup systems requiring stable component supply, extended temperature operation, and seamless power-path management.
Supply support for LTC4091EDJC#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4091EDJC#PBF belongs to Analog Devices' PowerPath™ family of battery backup managers, engineered specifically for robust, zero-downtime power delivery in automotive and harsh-environment applications.
FAQ
What is the maximum allowable input voltage for the LTC4091EDJC#PBF?
The LTC4091EDJC#PBF has an absolute maximum VIN rating of 60V for nonrepetitive 1-second transients, with continuous operation limited to 36V. Its 6–36V operating range is designed for automotive battery systems (including cold-crank down to 6V) and industrial 24V supplies. Exceeding 36V continuously risks triggering overvoltage lockout at 36–40V and may cause permanent damage if sustained beyond absolute max ratings.
How does the LTC4091EDJC#PBF handle battery temperature monitoring?
The LTC4091EDJC#PBF monitors battery temperature via its NTC pin (Pin 5) and VNTC pin (Pin 6), which provide a 4.4–4.85V bias voltage. A thermistor-to-ground divider sets VCOLD and VHOT thresholds (0.738×VNTC and 0.290×VNTC), pausing charging if the battery is too hot or too cold. This function is fully integrated - no external comparators or ADCs are needed - and operates across the full –40°C to 125°C junction range of the LTC4091EDJC#PBF.
Can the LTC4091EDJC#PBF support both 4.1V and 4.2V battery charge voltages?
Yes, the LTC4091EDJC#PBF supports pin-selectable charge voltages: 4.2V (default, V4P1 left open) and 4.1V (V4P1 tied to BAT). This selection directly affects cell longevity and capacity trade-offs - 4.1V extends cycle life in high-reliability applications like fleet trackers, while 4.2V maximizes runtime in GPS loggers. The LTC4091EDJC#PBF's internal resistor divider ensures ±0.5% regulation accuracy at either setting.
What is the role of the GATE pin on the LTC4091EDJC#PBF?
The GATE pin (Pin 10) on the LTC4091EDJC#PBF drives the gate of an external P-channel MOSFET placed between BAT and OUT, supplementing the internal 75mΩ ideal diode. When enabled, it reduces forward voltage drop to <20mV (e.g., with SiA433EDJ), improving backup efficiency under high load. The LTC4091EDJC#PBF automatically controls this FET - no external logic is required - and includes thermal coordination guidance to protect the MOSFET during overcurrent events.
How is charge termination implemented in the LTC4091EDJC#PBF?
The LTC4091EDJC#PBF implements dual-mode charge termination: (1) timer-based, set by CTIMER on Pin 17 (tTIMER = CTIMER × RPROG × 300), and (2) current-based, ending when charge current falls below 10% of programmed ICHG in constant-voltage mode. Both conditions trigger CHRG pin release to high-impedance. Thermal regulation extends timer duration inversely with actual delivered current, ensuring full charge even at elevated temperatures.
LTC4091EDJC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 22-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 1.5A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 36V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-DFN (6x3)
LTC4091EDJC#PBF FAQ
1.How can I place an order for LTC4091EDJC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4091EDJC#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 LTC4091EDJC#PBF reliable?
The price and inventory of LTC4091EDJC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4091EDJC#PBF is usually 5 days.
3.What payment methods are accepted for LTC4091EDJC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4091EDJC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4091EDJC#PBF?
LTC4091EDJC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4091EDJC#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 LTC4091EDJC#PBF?
For technical support, including LTC4091EDJC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4091EDJC#PBF requirements.
6.How does Aetrix verify that LTC4091EDJC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4091EDJC#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 LTC4091EDJC#PBF meets industry standards.
7.What is the process for return or replacement of LTC4091EDJC#PBF?
All LTC4091EDJC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4091EDJC#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 LTC4091EDJC#PBF part is unused and in its original packaging.
Return procedure for LTC4091EDJC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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