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Analog Devices Inc. LTC4091IDJC#PBF
- Part No.:
- LTC4091IDJC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 22-WFDFN Exposed Pad
- Datasheet:
-
LTC4091IDJC#PBF.pdf
- Description:
- IC BATT CHG LI-ION 22DFN
- Quantity:
- Payment:
- Shipping:
Inventory:116
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Product details
Overview
LTC4091IDJC#PBF from Analog Devices is a 36V Li-ion battery charger and power backup manager in a 22-lead 6mm × 3mm DFN package. It integrates a high-voltage step-down regulator (6V–36V input), adaptive output tracking (VBAT+0.1V to 4.45V max), programmable charge current up to 1.5A, internal 75mΩ ideal diode, and NTC-based thermal monitoring. It enables seamless transition between primary power and single-cell Li-ion/polymer battery in automotive telematics and GPS data loggers.
For engineers reviewing the LTC4091IDJC#PBF datasheet, LTC4091IDJC#PBF pinout, LTC4091IDJC#PBF application, or LTC4091IDJC#PBF equivalent, key selection criteria include its 4.1V/4.2V selectable charge voltage, ±0.5% VCHG accuracy, 100mV HVOUT–BAT regulation differential, thermal foldback behavior, and GATE-driven external PFET support for ultra-low dropout backup operation.
Technical Context
The LTC4091IDJC#PBF implements a constant-frequency, current-mode 2A high-voltage buck regulator with adaptive output control that maintains ~100mV headroom between HVOUT and BAT to minimize power loss during charging. Its charge algorithm combines trickle mode (2.75V–2.9V threshold), constant-current (programmable via PROG pin), and constant-voltage (4.1V or 4.2V) stages with C/10 termination and timer-based fallback.
Backup operation relies on an internal precision comparator that activates the 75mΩ ideal diode when VOUT drops ~25mV below VBAT, enabling sub-microsecond switchover. The GATE pin drives an external PFET for lower forward drop, while NTC monitoring uses VNTC bias and voltage-ratio thresholds (0.290×VNTC hot / 0.738×VNTC cold) to pause charging outside safe temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 36V continuous; 60V absolute max - supports automotive cold-crank and industrial 24V/36V rails. |
| Max Output Voltage | 4.45V - protects downstream 3.3V/4.2V logic and RF circuitry from overvoltage during backup. |
| Charge Voltage Options | Pin-selectable 4.1V or 4.2V - accommodates aging-sensitive cells or extended cycle life requirements. |
| Charge Current Accuracy | ±5% typical at 500mA - ensures predictable full-charge time and avoids over-stress of battery chemistry. |
| Ideal Diode On-Resistance | 75mΩ internal - limits voltage drop to ≤150mV at 2A load, reducing heat and preserving battery runtime. |
| Thermal Regulation Threshold | 105°C junction - dynamically reduces charge current to prevent thermal runaway in enclosed enclosures. |
| NTC Fault Detection | Voltage-ratio based (0.290×VNTC hot / 0.738×VNTC cold) - eliminates need for external ADC or microcontroller polling. |
Pinout & Package
Package: 22-lead (6mm × 3mm) plastic DFN with exposed GND pad (Pin 23), thermally enhanced for 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (13) | System power output | Delivers regulated power from VIN or BAT; requires ≥68µF bulk capacitance to maintain stability during switchover. |
| BAT (11,12) | Battery interface | Single-cell Li-ion anode/cathode node; used for charging and backup sourcing; precision divider sets final VCHG. |
| PROG (9) | Charge current programming | Resistor-to-GND sets ICHG = 52.5kΩ / RPROG; 1% metal film recommended for temp stability. |
| GATE (10) | External PFET driver | Drives gate of optional P-channel MOSFET (source=OUT, drain=BAT) to reduce ideal diode drop below 20mV. |
| V4P1 (14) | Charge voltage select | Floating = 4.2V; tied to BAT = 4.1V - leakage must be minimized to avoid unintended voltage shift. |
| NTC (5) / VNTC (6) | Battery temperature monitor | VNTC supplies bias; NTC connects to ground via thermistor - enables automatic charge pause at <0°C or >45°C. |
| CHRG (8) | Open-drain status indicator | Pulled low during active charge; high-Z at end-of-charge, thermal shutdown, or TIMER timeout - no external pull-up needed. |
| TIMER (17) | Charge duration control | Capacitor-to-GND sets tTIMER(hrs) = CTIMER × RPROG × 300 - extends time if thermal regulation reduces ICHG. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Output Tracking | Maintains HVOUT ≈ VBAT + 100mV to minimize power dissipation in charger path and maximize efficiency during charging. |
| Internal 75mΩ Ideal Diode | Enables <150mV dropout at 2A without external FETs - simplifies layout and reduces BOM count for cost-sensitive designs. |
| Programmable Charge Termination | Supports dual termination: C/10 current threshold detection and user-defined timer - improves reliability for varying battery capacities. |
| Thermal Foldback Protection | Reduces ICHG linearly above 85°C and halts charging at 105°C - prevents cell damage in sealed automotive enclosures. |
| Seamless Power Path Switchover | Transitions from VIN to BAT in <10µs with ≤100mV VOUT droop - sustains real-time GPS/GSM operation during ignition cycling. |
Applications
| Automotive Telematics | Fleet & Asset Tracking |
|---|---|
Use Scenario: Continuous GNSS/GPRS logging during vehicle engine-off periods using auxiliary battery. IC Role / Device Role / Timing Role: PowerPath™ manager ensuring uninterrupted 3.3V system rail during VIN interruption (e.g., stop-start cycles). Use Value: Eliminates need for supercapacitors or secondary regulators; 75mΩ ideal diode extends usable battery runtime by >18% vs. Schottky solution. | Use Scenario: Remote cargo container monitoring with periodic LTE transmission and long sleep intervals. IC Role / Device Role / Timing Role: Dual-role IC: charges Li-ion from solar/USB input and delivers regulated 4.45V max to MCU/radio during transmission bursts. Use Value: Adaptive output tracking minimizes voltage overhead, increasing energy available to load by ~12% versus fixed 4.5V LDO-based backup. |
| Automotive GPS Data Logger | Battery Backup Systems |
Use Scenario: High-accuracy dead-reckoning navigation during tunnel or urban canyon signal loss. IC Role / Device Role / Timing Role: Seamless transition supervisor maintaining precise 3.3V rail for IMU and GPS baseband ICs within 10µs. Use Value: Internal ideal diode's 25mV turn-on threshold ensures VOUT never falls below 3.25V - preserving GNSS lock integrity. | Use Scenario: Industrial IoT gateway requiring >72-hour backup during AC mains failure. IC Role / Device Role / Timing Role: High-efficiency battery charger + low-dropout backup source with thermal derating for enclosure ambient up to 70°C. Use Value: 105°C thermal shutdown and ±0.5% VCHG accuracy enable reliable 500-cycle lifetime in unventilated cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery backup management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24610RGET | Fixed 4.2V charge voltage; no 4.1V option; requires external sense resistor for current setting; no integrated ideal diode. | Suited for cost-sensitive consumer devices where thermal monitoring and adaptive output are non-critical. | Select BQ24610RGET only if 4.1V charging is unnecessary and external ideal diode control is acceptable. |
| MAX17596ATJ+ | Wider input range (4.5V–60V); supports 2-cell Li-ion; includes PMBus interface; higher quiescent current (120µA vs 100µA). | Targeted at industrial servers and telecom systems needing multi-cell support and digital configuration. | Choose MAX17596ATJ+ when 2-cell battery, digital telemetry, or >40V input tolerance is required. |
Compared with BQ24610RGET and MAX17596ATJ+, the LTC4091IDJC#PBF uniquely combines pin-selectable 4.1V/4.2V charging, integrated 75mΩ ideal diode, and adaptive output tracking in a thermally optimized DFN - making it optimal for space-constrained automotive and portable backup applications demanding high efficiency and seamless switchover.
Availability
LTC4091IDJC#PBF is available at Aetrix Electronics and suitable for automotive telematics, fleet tracking, GPS data loggers, battery backup systems, and seamless power-path applications requiring stable component supply across extended temperature ranges.
Supply support for LTC4091IDJC#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4091IDJC#PBF belongs to Linear's PowerPath™ family, designed specifically for robust, high-efficiency battery backup and charging in harsh environments such as automotive, industrial, and portable instrumentation.
FAQ
What is the maximum continuous input voltage rating for the LTC4091IDJC#PBF?
The LTC4091IDJC#PBF supports continuous input voltages from 6V to 36V. Its absolute maximum rating is 60V for nonrepetitive one-second transients, but sustained operation above 36V violates specifications and may cause permanent damage. Designers must ensure transient suppressors or clamping circuits limit VIN to ≤36V under all operating conditions for reliable use of the LTC4091IDJC#PBF.
How does the LTC4091IDJC#PBF select between 4.1V and 4.2V battery charge voltage?
The LTC4091IDJC#PBF selects charge voltage via the V4P1 pin (Pin 14): leaving V4P1 floating configures 4.2V regulation, while connecting V4P1 directly to the BAT pin selects 4.1V. This selection is implemented via an internal precision resistor divider and requires minimal leakage paths - any parasitic current >100nA on V4P1 can shift the actual VCHG by >10mV, so PCB layout must isolate this node from adjacent traces and vias.
Can the LTC4091IDJC#PBF operate without an external NTC thermistor?
Yes, the LTC4091IDJC#PBF can operate without an NTC thermistor: grounding the NTC pin (Pin 5) disables temperature monitoring and allows full-temperature-range charging. However, this removes critical safety protection - the device will not pause charging if the battery exceeds safe thermal limits. For automotive or industrial deployments, Analog Devices strongly recommends retaining the NTC network (VNTC→NTC→thermistor→GND) to comply with IEC 62133 and UN38.3 battery safety standards applicable to the LTC4091IDJC#PBF.
What is the purpose of the GATE pin on the LTC4091IDJC#PBF, and how is it used?
The GATE pin (Pin 10) on the LTC4091IDJC#PBF drives the gate of an external P-channel MOSFET configured as a supplemental ideal diode between BAT and OUT. When enabled, this FET reduces forward voltage drop below 20mV at 2A - significantly improving backup efficiency over the internal 75mΩ diode alone. The GATE pin must remain floating if unused; any leakage path to GND or VOUT will cause unintended FET turn-on and potential shoot-through during switchover events involving the LTC4091IDJC#PBF.
How does the LTC4091IDJC#PBF handle thermal regulation during charging?
The LTC4091IDJC#PBF initiates thermal regulation when junction temperature exceeds 85°C: it linearly reduces charge current to maintain TJ ≤ 105°C, where hard thermal shutdown occurs. This behavior is intrinsic to the charger's VC loop and requires no external components. Because charge time scales inversely with delivered current, the TIMER capacitor value must be selected assuming worst-case thermal derating - e.g., a 2-hour nominal timer may extend to 4 hours at 70°C ambient in a poorly ventilated enclosure using the LTC4091IDJC#PBF.
LTC4091IDJC#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)
LTC4091IDJC#PBF FAQ
1.How can I place an order for LTC4091IDJC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4091IDJC#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 LTC4091IDJC#PBF reliable?
The price and inventory of LTC4091IDJC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4091IDJC#PBF is usually 5 days.
3.What payment methods are accepted for LTC4091IDJC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4091IDJC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4091IDJC#PBF?
LTC4091IDJC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4091IDJC#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 LTC4091IDJC#PBF?
For technical support, including LTC4091IDJC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4091IDJC#PBF requirements.
6.How does Aetrix verify that LTC4091IDJC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4091IDJC#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 LTC4091IDJC#PBF meets industry standards.
7.What is the process for return or replacement of LTC4091IDJC#PBF?
All LTC4091IDJC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4091IDJC#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 LTC4091IDJC#PBF part is unused and in its original packaging.
Return procedure for LTC4091IDJC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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