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Analog Devices Inc. LT1769IGN#PBF
- Part No.:
- LT1769IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1769IGN#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LT1769IGN#PBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage 2A switching battery charger IC for Li-ion, NiMH, and NiCd cells. It integrates a 3A peak internal NPN switch, achieves 0.5% voltage regulation accuracy and 5% charge current accuracy, supports input current limiting to avoid adapter overload, and operates across 8V–28V input and 1V–20V battery voltage ranges.
For engineers reviewing the LT1769IGN#PBF datasheet, LT1769IGN#PBF pinout, LT1769IGN#PBF application, or LT1769IGN#PBF equivalent, this page delivers verified technical context, validated pin functions, real-world charging use cases, and two confirmed alternative parts with documented functional differences - all grounded in the official LT1769 datasheet (1769fa) and Linear/Analog Devices product documentation.
Technical Context
The LT1769IGN#PBF implements a current-mode PWM buck topology with three independent control loops: battery charge current regulation via PROG pin programming (resistor or DAC), constant-voltage termination using a precision 2.465V reference and OVP amplifier, and input adapter current limiting via CLP/CLN differential sensing at 100mV threshold. Its 200kHz oscillator enables compact magnetics and high efficiency.
It features ground-referenced current sensing (BAT/SENSE pins), adaptive soft-start via VC pin capacitor (0.33µF typical), undervoltage lockout with 6.7V rising threshold and 0.5V hysteresis on UV pin, and automatic sleep mode drawing only 3µA when VCC is removed - eliminating need for external blocking diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | Programmable up to 2A DC (3A peak); set by RPROG and sense resistor ratio - enables precise fast-charge tuning for diverse cell capacities. |
| Constant-Voltage Accuracy | ±0.5% at 25°C (±1% over full temperature); ensures safe Li-ion float voltage compliance without external trimming. |
| Input Voltage Range | 8V to 28V at VCC pins; requires ≥3V headroom above VBAT - supports wide-range wall adapters and industrial power supplies. |
| Switching Frequency | 180–220 kHz (typical 200 kHz); balances efficiency, EMI, and inductor size - compatible with standard 22µH power inductors. |
| Battery Voltage Range | 1V to 20V; accommodates single-cell Li-ion (4.2V), multi-cell NiMH/NiCd stacks, and lead-acid configurations. |
| Reverse Battery Drain | 3 µA typical in sleep mode (VCC disconnected); eliminates need for external reverse-blocking diode - reduces BOM count and power loss. |
| Thermal Resistance θJA | 35°C/W (GN package with exposed pad soldered to PCB ground plane); enables full 2A operation without forced air in moderate ambient. |
Pinout & Package
LT1769IGN#PBF is packaged in a 28-lead narrow SSOP (GN package) with exposed thermal pad fused to internal GND - requires soldering to expanded PCB ground land for thermal management (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1–3, 7, 8, 14, 15, 22, 26–28) | Power and signal ground reference | All GND pins connect internally to die attach paddle - must be tied to large copper area for heat sinking and low-noise return path. |
| SW (Pin 4) | Switch node output | Drives external Schottky catch diode; high dv/dt node requiring short, low-inductance layout to minimize EMI and switching loss. |
| BOOST (Pin 5) | Bootstrap drive for internal NPN switch | Supplies gate drive above VCC to saturate internal transistor - reduces RON and conduction loss; connects to VCC + VBAT during ON time. |
| UV (Pin 6) | Undervoltage lockout input | Triggers shutdown when adapter voltage drops below 6.7V (rising); hysteresis prevents chatter - requires pull-down resistor if unused. |
| OVP (Pin 9) | Voltage feedback input for CV loop | Connects to battery voltage divider; 2.465V reference sets float voltage - 3nA bias current enables high-resistance dividers (e.g., 162k/390k for 8.4V). |
| CLP / CLN (Pins 10/11) | Differential input for adapter current limit | Sense resistor (RS4) placed between CLP and CLN; 100mV threshold allows analog current limiting without digital intervention. |
| PROG (Pin 21) | Charge current programming input | Accepts current source (RPROG or DAC) to set IBAT; internal 2.465V reference enables resistor-based programming with ±5% accuracy. |
| VC (Pin 20) | Inner-loop current control voltage | 0.7V threshold starts switching; ramp rate controlled by external capacitor - determines soft-start duration and current slew rate. |
| BAT / SENSE (Pins 17/13) | Current sense inputs | Enable high-side or low-side sensing; no ground-referencing required - simplifies layout for battery-negative-ground systems. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A peak NPN switch | Eliminates external power transistor - reduces component count, layout area, and gate-drive complexity in buck charger designs. |
| Three-loop control architecture | Simultaneously regulates charge current, battery voltage, and adapter input current - enables concurrent system operation and battery charging without adapter overload. |
| 0.5% voltage reference accuracy | Meets stringent Li-ion float voltage tolerance (±1% total) without calibration - critical for cell longevity and safety compliance. |
| 3µA sleep-mode quiescent current | Prevents battery drain when AC adapter is unplugged - removes need for mechanical disconnect or external load switch. |
| Flexible current programming | Supports resistor-based setup (±5% accuracy) or DAC-controlled dynamic adjustment - enables microcontroller-managed charge profiles. |
Applications
| Lithium-Ion Notebook Charger | NiMH Power Tool Pack Charger |
|---|---|
Use Scenario: Charging 2S or 3S Li-ion packs in portable computing equipment with shared AC adapter powering both system and battery. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger IC managing full 2A charge cycle, adapter current limiting, and automatic CV taper. Use Value: Enables simultaneous system operation and fast charging without adapter derating - leverages 200kHz switching for compact 22µH inductor and minimal board space. |
Use Scenario: Fast-charging multi-cell NiMH battery packs in cordless power tools with thermal and voltage safety monitoring. IC Role / Device Role / Timing Role: High-efficiency buck charger providing programmable CC current and optional overvoltage protection via OVP pin. Use Value: Delivers 2A charge current with <0.25Ω total sense resistance (RS1), minimizing power loss and heat generation in high-current tool applications. |
| Industrial Portable Medical Device | Backup Telecom Battery System |
Use Scenario: Recharging sealed lead-acid or LiFePO₄ backup batteries in portable diagnostic equipment with strict low-quiescent requirements. IC Role / Device Role / Timing Role: Primary battery charger IC with 3µA sleep current and undervoltage lockout - maintains battery readiness during long standby periods. Use Value: Eliminates reverse battery drain without external MOSFET - extends shelf life and reduces maintenance in field-deployed medical hardware. |
Use Scenario: Maintaining float charge on 12V telecom backup batteries while supporting active load during grid outages. IC Role / Device Role / Timing Role: Precision CV charger IC regulating float voltage to ±1% with adaptive input current limiting during generator or UPS operation. Use Value: Uses internal 2.465V reference and high-impedance OVP input to achieve stable 13.8V float with 0.25% resistors - avoids costly external voltage references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | Requires external N-channel MOSFET; supports higher 3A+ charge current; includes SMBus interface and comprehensive telemetry. | Targeted at high-end server/industrial chargers needing digital control and fault logging - not pin-compatible and demands more design effort. | Select LTC4000-1 when system-level telemetry, programmable charge termination, or >2A current is required - not a drop-in replacement. |
| MAX1759 | Fixed 1A max charge current; integrated LDO bias supply; smaller 16-pin TQFN package; no input current limiting loop. | Optimized for space-constrained consumer devices (e.g., Bluetooth headsets) where adapter sharing is unnecessary and lower current suffices. | Choose MAX1759 for cost-sensitive, low-power portable designs where 2A capability and adapter current limiting are not needed. |
Compared with LTC4000-1 and MAX1759, the LT1769IGN#PBF uniquely combines integrated 2A switching, three-loop analog control, and 3µA sleep current in a thermally enhanced SSOP package - making it optimal for mid-power industrial and portable equipment requiring robustness and minimal external components.
Availability
LT1769IGN#PBF is available at Aetrix Electronics and suitable for industrial portable medical devices, telecom backup systems, cordless power tools, and notebook battery charging applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1769IGN#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors - serving industrial, automotive, communications, and healthcare markets.
The LT1769 belongs to Linear's legacy battery management IC portfolio, designed specifically for efficient, analog-controlled switching chargers targeting portable and industrial equipment where reliability, thermal performance, and adapter-sharing capability are critical.
FAQ
What is the maximum continuous battery charge current supported by the LT1769IGN#PBF?
The LT1769IGN#PBF supports up to 2A continuous DC battery charge current, with internal switch rated for 3A peak. This is achieved using the PROG pin with appropriate resistor programming (e.g., RPROG = 4.93kΩ, RS1 = 0.05Ω). Thermal design must ensure junction temperature remains ≤125°C - verified via θJA = 35°C/W with proper exposed-pad grounding.
Does the LT1769IGN#PBF require an external blocking diode between the IC and battery?
No, the LT1769IGN#PBF does not require an external blocking diode. When the AC adapter is removed, the IC enters sleep mode and draws only 3µA from the battery. This is enabled by internal circuitry that disables the switch and isolates VCC - a key advantage over discrete charger solutions.
How is input adapter current limiting implemented in the LT1769IGN#PBF?
The LT1769IGN#PBF implements analog adapter current limiting via the CLP and CLN pins, which form a differential input to an internal amplifier with 100mV threshold. A sense resistor (RS4) placed between CLP and CLN allows closed-loop reduction of charge current to keep total adapter draw within defined limits - enabling simultaneous system operation and charging.
Can the LT1769IGN#PBF charge lithium-ion and nickel-based batteries with the same circuit?
Yes, the LT1769IGN#PBF supports Li-ion, NiMH, and NiCd chemistries with minor configuration changes. For Li-ion, use OVP feedback for CV termination; for NiMH/NiCd, disable OVP (ground pin) and rely on timer-based or dT/dt termination externally - the core CC regulation and 2A capability remain fully applicable across chemistries.
What is the function of the VC pin on the LT1769IGN#PBF, and how is it used?
VC is the inner-loop current control voltage pin. Switching begins at 0.7V; charge current ramps with VC voltage (full current at ~1.1V). A 0.33µF capacitor to GND sets soft-start timing (~10ms to full current). Pulling VC low shuts down switching - enabling microcontroller-controlled enable/disable or safety-triggered shutdown.
LT1769IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 20V (Max)
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LT1769IGN#PBF FAQ
1.How can I place an order for LT1769IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1769IGN#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 LT1769IGN#PBF reliable?
The price and inventory of LT1769IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1769IGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1769IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1769IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1769IGN#PBF?
LT1769IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1769IGN#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 LT1769IGN#PBF?
For technical support, including LT1769IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1769IGN#PBF requirements.
6.How does Aetrix verify that LT1769IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1769IGN#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 LT1769IGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1769IGN#PBF?
All LT1769IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1769IGN#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 LT1769IGN#PBF part is unused and in its original packaging.
Return procedure for LT1769IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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