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Analog Devices Inc. LT1769CFE#PBF
- Part No.:
- LT1769CFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1769CFE#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
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Product details
Overview
LT1769CFE#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 2A DC / 3A peak internal NPN switch, delivers 0.5% voltage regulation accuracy, supports input current limiting to avoid adapter overload, and operates across 1V–20V battery voltages with 3µA reverse battery drain in sleep mode.
For engineers reviewing the LT1769CFE#PBF datasheet, LT1769CFE#PBF pinout, LT1769CFE#PBF application, or LT1769CFE#PBF equivalent, this page provides verified technical context, validated pin functions, real-world charging use cases, and two confirmed alternative parts with documented functional differences and selection guidance.
Technical Context
The LT1769CFE#PBF implements a current-mode PWM buck topology with three independent control loops: battery charge current regulation via PROG-pin programming (±5% accuracy), constant-voltage termination using a 2.465V ±0.5% reference and VA amplifier, and input adapter current limiting via CLP/CLN pins with 100mV threshold. Its 200kHz oscillator enables compact magnetics and high efficiency.
It supports ground-referenced or high-side current sensing, features soft-start via VC pin capacitor (0.33µF typical), undervoltage lockout with 6.7V rising threshold and 0.5V hysteresis, and automatic shutdown when VCC drops-reducing battery drain to 3µA. The exposed-pad TSSOP-20 package provides θJA = 35°C/W thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 2A DC continuous (3A peak); enables fast charging of single-cell Li-Ion or multi-cell NiMH packs. |
| CV Voltage Accuracy | ±0.5% at 25°C (±1% over full temp range); meets critical Li-Ion float voltage tolerance without external trimming. |
| Input Adapter Current Limit | Programmable via CLP/CLN; 100mV threshold allows precise control of total system draw to prevent wall-adapter overload. |
| Switch ON Resistance | 0.15Ω typical (0.25Ω max); minimizes conduction loss and thermal rise at 2A load. |
| Reverse Battery Drain | 3µA typical when adapter removed; preserves battery capacity during storage or unplugged operation. |
| Switching Frequency | 200kHz nominal (170–230kHz over temp); balances efficiency, EMI, and inductor size for portable designs. |
| UVLO Threshold | 6.7V rising (6.2V falling); prevents erratic operation during brown-out and ensures clean startup above adapter minimum. |
Pinout & Package
LT1769CFE#PBF is housed in a 20-lead plastic TSSOP with exposed thermal pad (FE package). The bottom metal plate is fused to internal GND and must be soldered to PCB ground plane for effective heat sinking (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Output | Drives external Schottky catch diode; connects to inductor node in buck topology. |
| BOOST (Pin 2) | Bootstrap Driver | Supplies gate drive to internal NPN switch; requires low-impedance path to VCC + VBAT during ON phase. |
| UV (Pin 3) | Undervoltage Lockout Input | Monitors adapter input; disables switching below 6.7V to prevent unstable operation. |
| GND (Pins 4,5,14,20) | Ground Reference | Multiple low-inductance GND connections tied to exposed pad; essential for noise immunity and thermal management. |
| OVP (Pin 6) | Voltage Sense Input | Connects to battery voltage divider; compares against 2.465V reference to terminate CV mode. |
| CLP / CLN (Pins 8,7) | Adapter Current Sense Inputs | Differential pair measuring voltage across sense resistor RS4; enables closed-loop input current limiting. |
| SENSE / BAT (Pins 10,12) | Battery Current Sense Inputs | Accepts high-side or low-side sensing; supports bidirectional current measurement without ground-referencing constraint. |
| PROG (Pin 16) | Charge Current Programming | Receives DAC or resistor-programmed current; sets IBAT = (2.465V/RPROG) × (RS2/RS1). |
| VC (Pin 15) | Current Mode Control | Inner-loop PWM ramp input; soft-start controlled by external capacitor; pull low to shut down. |
| VCC1–VCC3 (Pins 17–19) | Power Supply Inputs | Three parallel inputs requiring low-ESR ≥15µF input cap; must be ≥3V above VBAT and ≤28V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A Switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity in space-constrained battery systems. |
| Triple-Loop Regulation | Simultaneous CC/CV battery control + adapter current limiting enables concurrent system operation and charging without firmware intervention. |
| Flexible Current Sensing | SENSE/BAT pins accept sensing at either battery terminal-enabling ground-referenced or high-side configurations without level-shifting circuitry. |
| Low Sleep-Mode Drain | 3µA quiescent current when VCC removed extends shelf life of backup batteries and portable devices in storage. |
| Programmable UVLO | Resistive divider on UV pin allows custom adapter brown-out threshold (e.g., 12V lockout), preventing underpowered operation. |
Applications
| Laptop Battery Charging System | Industrial Handheld Terminal |
|---|---|
Use Scenario: Portable computing device with dual-role AC adapter powering main system and recharging integrated Li-Ion pack. IC Role / Device Role / Timing Role: Primary battery charger IC managing CC/CV profile, adapter current sharing, and thermal-safe 2A charge delivery. Use Value: Enables simultaneous operation and charging without adapter oversizing; 0.5% CV accuracy ensures cell longevity and safety compliance. |
Use Scenario: Ruggedized field terminal with hot-swappable NiMH battery pack requiring reliable, maintenance-free charging in variable ambient conditions. IC Role / Device Role / Timing Role: Constant-current charger with programmable termination and undervoltage lockout for wide-input industrial adapters. Use Value: Adjustable UVLO and input current limiting allow stable operation across 11–28V unregulated supplies; 3µA sleep drain preserves battery during extended idle periods. |
| Medical Infusion Pump | Emergency Lighting Backup |
Use Scenario: Life-critical portable medical device requiring certified battery charging with fail-safe voltage regulation and low standby leakage. IC Role / Device Role / Timing Role: Safety-critical battery management IC delivering precise 8.4V float voltage for Li-Ion cells with ±1% total accuracy over temperature. Use Value: Integrated 2.465V reference and OVP amplifier eliminate external precision references; reverse drain <5µA prevents battery depletion during long standby. |
Use Scenario: Emergency lighting unit with sealed lead-acid or LiFePO₄ backup battery charged from facility mains via isolated DC adapter. IC Role / Device Role / Timing Role: Universal CC/CV charger supporting multiple chemistries (Li-Ion/NiMH) with programmable current and voltage setpoints. Use Value: PROG-pin DAC interface allows microcontroller-based adaptive charging profiles; CLP/CLN loop ensures adapter stays within UL-certified current limits. |
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 | External PMOS switch controller (no integrated switch); supports up to 3A with higher VIN range (4.5V–36V); includes SMBus interface. | Requires external power FET and gate driver; suited for high-power or digitally managed systems where flexibility outweighs integration. | Select LTC4000-1 when designing >2A chargers, needing I²C telemetry, or requiring wider input voltage than LT1769CFE#PBF's 8–28V range. |
| MP2617 | Monolithic 2A charger with integrated MOSFETs; fixed 4.2V CV, no adapter current limiting; 1.5MHz switching; smaller QFN-16 package. | Lacks CLP/CLN input limiting and programmable CV voltage; optimized for cost-sensitive consumer Li-Ion only (not NiMH/NiCd). | Choose MP2617 for compact, low-cost single-cell Li-Ion charging where adapter coexistence and multi-chemistry support are not required. |
Compared with LTC4000-1 and MP2617, the LT1769CFE#PBF uniquely combines integrated 2A switching, triple-loop regulation (CC/CV + adapter current limit), and broad chemistry support in a thermally robust TSSOP-20 package-making it optimal for industrial and medical applications demanding reliability, flexibility, and analog precision without digital overhead.
Availability
LT1769CFE#PBF is available at Aetrix Electronics and suitable for laptop battery charging systems, industrial handheld terminals, medical infusion pumps, and emergency lighting backup requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1769CFE#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 and maintains its high-performance analog IC portfolio, emphasizing precision, power efficiency, and ruggedness for industrial, automotive, and medical applications.
The LT1769CFE#PBF belongs to Linear's dedicated battery management IC family, engineered for standalone, microcontroller-free charging of Li-Ion, NiMH, and NiCd cells in equipment requiring simultaneous system operation and battery recharge.
FAQ
What battery chemistries does the LT1769CFE#PBF support?
The LT1769CFE#PBF supports lithium-ion (Li-Ion), nickel-metal-hydride (NiMH), and nickel-cadmium (NiCd) rechargeable batteries. Its programmable constant-current and constant-voltage regulation-plus adjustable undervoltage lockout and input current limiting-enables safe, efficient charging across all three chemistries without hardware changes. The LT1769CFE#PBF datasheet confirms compatibility with 1V–20V battery ranges and provides application circuits for each type.
How is charge current programmed on the LT1769CFE#PBF?
Charge current on the LT1769CFE#PBF is programmed via the PROG pin using either a resistor network or a DAC. The core equation is IBAT = (2.465V / RPROG) × (RS2 / RS1), where RPROG sets the reference current and RS1/RS2 scale the sensed battery current. A typical 2A design uses RS1 = 0.05Ω and RPROG = 4.93kΩ. The LT1769CFE#PBF also accepts PWM-modulated current into PROG for microcontroller-based dynamic adjustment.
Does the LT1769CFE#PBF require an external blocking diode?
No, the LT1769CFE#PBF does not require an external blocking diode between the IC and battery. When the AC adapter is disconnected, the LT1769CFE#PBF enters sleep mode and draws only 3µA from the battery-eliminating reverse current concerns. This is achieved through internal circuitry that disables the switch and isolates VCC, as confirmed in the LT1769CFE#PBF absolute maximum ratings and applications information sections.
What is the purpose of the CLP and CLN pins on the LT1769CFE#PBF?
The CLP (pin 8) and CLN (pin 7) pins on the LT1769CFE#PBF form a differential input for adapter current limiting. They monitor voltage across a sense resistor (RS4) placed in the adapter input path. When the sensed voltage exceeds 100mV, the LT1769CFE#PBF reduces charge current to keep total adapter draw within the programmed limit-enabling simultaneous system operation and battery charging without adapter overload. This function is unique to the LT1769CFE#PBF among monolithic 2A chargers.
Can the LT1769CFE#PBF charge batteries with the negative terminal grounded?
Yes, the LT1769CFE#PBF supports ground-referenced battery configurations. Its SENSE and BAT pins allow current sensing at either battery terminal, and the battery's negative terminal can be tied directly to system ground without requiring floating or high-side sensing circuitry. This simplifies PCB layout and eliminates level-shifters-confirmed in the LT1769CFE#PBF block diagram and pin-function descriptions.
LT1769CFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT1769CFE#PBF FAQ
1.How can I place an order for LT1769CFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1769CFE#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 LT1769CFE#PBF reliable?
The price and inventory of LT1769CFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1769CFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1769CFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1769CFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1769CFE#PBF?
LT1769CFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1769CFE#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 LT1769CFE#PBF?
For technical support, including LT1769CFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1769CFE#PBF requirements.
6.How does Aetrix verify that LT1769CFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1769CFE#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 LT1769CFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1769CFE#PBF?
All LT1769CFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1769CFE#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 LT1769CFE#PBF part is unused and in its original packaging.
Return procedure for LT1769CFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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