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Analog Devices Inc. LT1769CGN#TRPBF
- Part No.:
- LT1769CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1769CGN#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,548
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Product details
Overview
LT1769CGN#TRPBF 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, achieves 0.5% voltage regulation accuracy via a precision 2.465V reference, supports input current limiting to prevent adapter overload, and operates across 8V–28V VCC with 1V–20V battery voltage range. It enables simultaneous system operation and charging in portable medical devices and industrial handhelds.
For engineers reviewing the LT1769CGN#TRPBF datasheet, LT1769CGN#TRPBF pinout, LT1769CGN#TRPBF application, or LT1769CGN#TRPBF equivalent, key selection considerations include its 200kHz current-mode PWM architecture, dual-loop (battery current + adapter current) regulation, exposed-pad 28-lead SSOP thermal performance (θJA = 35°C/W), and 3µA reverse battery drain in sleep mode when AC adapter is removed.
Technical Context
The LT1769CGN#TRPBF implements a synchronous buck topology with current-mode control, using slope compensation and a 200kHz oscillator to stabilize the inner current loop. Its dual feedback structure includes CA1 for battery current sensing (with programmable gain via RS2/RS3), VA for precise 2.465V OVP threshold, and CL1 for adapter current limiting at 100mV across RS4.
It features three independent control loops: battery charge current (programmed via PROG pin with ±5% accuracy), battery voltage regulation (0.5% reference accuracy over temperature), and input adapter current limit (adjustable via CLP/CLN). The VC pin serves as the inner-loop control signal (0.7V startup threshold), while UVOUT provides open-collector undervoltage lockout status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Battery Charge Current | 2A DC continuous (3A peak); enables fast charging of single-cell Li-ion or multi-cell NiMH packs without external switch. |
| Reference Voltage Accuracy | ±0.5% at 25°C (±1% over full temp); ensures Li-ion float voltage stability within critical 1% battery specification. |
| Switching Frequency | 200kHz typical (170–230kHz over temp); balances efficiency, inductor size (e.g., 22µH), and EMI in compact layouts. |
| Adapter Current Limit Threshold | 100mV at CLP–CLN pins; allows analog closed-loop reduction of charge current to prevent wall-adapter overload during concurrent system use. |
| Reverse Battery Drain Current | 3µA typical when VCC removed; minimizes standby battery loss in always-connected portable equipment. |
| Undervoltage Lockout Threshold | 6.7V rising (6.2V falling) at UV pin; prevents operation below safe adapter input, with 0.5V hysteresis to avoid oscillation. |
| Package Thermal Resistance | θJA = 35°C/W (GN package); supports 2A charging at ambient ≤65°C with standard PCB copper pour on exposed pad. |
Pinout & Package
The LT1769CGN#TRPBF is housed in a 28-lead narrow SSOP package with an exposed ground paddle (3.0mm × 4.1mm) soldered to PCB for thermal management (θJA = 35°C/W). All GND pins (1–3, 7, 8, 14, 15, 22, 26–28) must be connected to the exposed pad and expanded ground lands.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 4) | Switch Output | Drives external Schottky catch diode; connects to inductor node; requires short trace to GND to minimize ringing and losses. |
| BOOST (Pin 5) | Bootstrap Driver | Supplies gate drive to internal NPN switch; VBOOST ≈ VCC + VBAT during ON time; reduces RON and conduction loss. |
| UV (Pin 6) | Undervoltage Input | Monitors adapter input; triggers shutdown if VUV < 6.2V; requires pull-down resistor to ensure 3µA sleep mode when unplugged. |
| OVP (Pin 9) | Voltage Sense Input | Connects to battery voltage divider; 2.465V threshold sets Li-ion float voltage (e.g., 8.4V with 162k/390k resistors). |
| CLP / CLN (Pins 10/11) | Adapter Current Sense Inputs | Differential pair measuring voltage across RS4; 100mV threshold enables real-time charge current reduction to protect AC adapter. |
| PROG (Pin 21) | Charge Current Programming | Accepts DAC current or resistor-programmed IPROG; IBAT = (2.465V/RPROG) × (RS2/RS1); ±5% total accuracy. |
| VC (Pin 20) | Current Loop Control | Inner-loop PWM comparator input; 0.7V threshold initiates switching; soft-start controlled by 0.33µF capacitor to GND. |
| BAT / SENSE (Pins 17/13) | Battery Current Sense Terminals | Support high-side or low-side sensing; no ground-sense requirement; enables direct battery-negative grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A Switch with 0.25Ω RON | Eliminates need for external MOSFET and driver; reduces BOM count and layout area in space-constrained battery packs. |
| Three Independent Regulation Loops | Simultaneously controls battery charge current, battery voltage, and adapter input current-enabling true concurrent system + charge operation. |
| Programmable Charge Current (Resistor or DAC) | Enables dynamic charge rate adjustment via microcontroller DAC output; supports adaptive charging profiles and thermal derating. |
| Low 3µA Sleep-Mode Drain | Preserves battery capacity during storage or transport; achieved by automatic transition to ultra-low-power state when VCC is absent. |
| Adjustable Undervoltage Lockout | Configurable via external resistor divider on UV pin; prevents unstable operation at marginal adapter voltages and improves system robustness. |
Applications
| Lithium-Ion Portable Medical Devices | Industrial Handheld Test Equipment |
|---|---|
|
Use Scenario: Rechargeable Li-ion battery pack in ultrasound probe or glucose meter requiring safe, autonomous charging without host MCU intervention. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with automatic CV transition and sleep-mode entry; replaces discrete charge controller + supervisor IC. Use Value: 0.5% voltage accuracy ensures compliance with IEC 62368-1 battery safety requirements; 3µA reverse drain extends shelf life beyond 12 months. |
Use Scenario: Field-deployable multimeter or oscilloscope with hot-swappable battery and continuous operation during charging. IC Role / Device Role / Timing Role: Dual-loop regulator managing both battery charge and system load current from shared AC adapter; eliminates need for external power-path manager. Use Value: Adapter current limiting (via CLP/CLN) prevents brownouts during high-current measurements; 200kHz switching enables compact 22µH inductor. |
| NiMH/NiCd Power Tools | Emergency Lighting Systems |
|
Use Scenario: Cordless drill/driver with multi-cell NiMH pack requiring high-current (2A) bulk charge and low-current (100mA) maintenance charge. IC Role / Device Role / Timing Role: Programmable current source supporting two-level charging via PWM on PROG pin; uses SPIN/BAT/SENSE for accurate cell-current monitoring. Use Value: ±5% charge current accuracy maintains cell balance across series strings; adjustable UV lockout avoids premature cutoff during generator-powered charging. |
Use Scenario: LED-based exit sign with sealed lead-acid or LiFePO₄ backup battery, required to remain operational >90 minutes after AC failure. IC Role / Device Role / Timing Role: High-efficiency buck charger delivering up to 2A to maintain battery SOC during grid operation; enters low-drain sleep mode upon AC loss. Use Value: 94% typical efficiency (at 2A, VIN=16.5V, VBAT=8.4V) minimizes thermal stress in enclosed enclosures; exposed-pad SSOP aids passive cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | 42V max input, 2A sync buck, integrated MOSFETs, 0.8V ref; lacks adapter current limiting loop and UVOUT pin. | Designed for solar/battery hybrid systems with wide VIN; not suitable where adapter current sharing with system load is required. | Choose LT3652 for higher-input-voltage (>28V) or solar-charging applications; avoid when adapter current limiting is mandatory. |
| BQ24610RGER | 3–28V input, 2.5A, integrated MOSFETs, 0.5% Vref, but uses external sense resistor and lacks BOOST pin for low-RON drive. | Requires external high-side current sense and separate gate drivers; higher conduction loss at 2A due to external FET RDS(on). | Choose BQ24610 for TI ecosystem designs needing I²C configuration; prefer LT1769CGN#TRPBF for lower component count and better thermal performance in SSOP. |
Compared with LT3652IMSE#TRPBF and BQ24610RGER, the LT1769CGN#TRPBF uniquely integrates adapter current limiting, BOOST-driven internal NPN, and UVOUT status signaling-making it optimal for cost-sensitive, thermally constrained AC-adapter-powered portable equipment requiring concurrent operation.
Availability
LT1769CGN#TRPBF is available at Aetrix Electronics and suitable for lithium-ion medical wearables, industrial handheld test instruments, emergency lighting systems, and cordless power tools requiring stable component supply and long-term production continuity.
Supply support for LT1769CGN#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing support for legacy Linear products including the LT1769 family.
The LT1769 belongs to Linear's precision battery management IC portfolio, designed specifically for high-accuracy, high-efficiency standalone charging of Li-ion, NiMH, and NiCd batteries in space- and thermal-constrained portable systems.
FAQ
What is the maximum battery voltage supported by the LT1769CGN#TRPBF?
The LT1769CGN#TRPBF supports battery voltages from 1V to 20V, enabling charging of single-cell Li-ion (up to 4.2V), 2–5-cell NiMH/NiCd stacks, and certain lead-acid configurations. This range is explicitly specified in the Absolute Maximum Ratings and confirmed in the Applications Information section under "Battery Voltage Sense Resistors Selection." The OVP amplifier input common-mode range extends to VCC – 2V, ensuring reliable operation across the full 20V span when VCC ≥ 22V.
Can the LT1769CGN#TRPBF operate without an external catch diode?
Yes, the LT1769CGN#TRPBF does not require an external blocking diode between SW and the battery because it enters a low-power sleep mode (3µA drain) when the AC adapter is disconnected. The internal circuitry disables the switch and isolates the battery path, eliminating reverse current flow. This is explicitly stated in the product description: "A blocking diode is not required between the chip and the battery because the chip goes into sleep mode and drains only 3µA when the wall adapter is unplugged."
How is charge current programmed on the LT1769CGN#TRPBF?
Charge current on the LT1769CGN#TRPBF is programmed via the PROG pin using either a resistor (RPROG) or a DAC sink current, per the formula IBAT = (2.465V / RPROG) × (RS2 / RS1). Typical implementation uses RPROG = 4.93kΩ, RS1 = 0.05Ω, and RS2 = RS3 = 200Ω to achieve 2A. The datasheet confirms ±5% accuracy and specifies that the DAC must sink current with up to 2.465V compliance. This method is validated in Figure 1 and the "Charge Current Programming" section.
What is the purpose of the BOOST pin on the LT1769CGN#TRPBF?
The BOOST pin on the LT1769CGN#TRPBF supplies bootstrapped gate drive to the internal NPN switch, reducing its saturation voltage and conduction losses. During switch ON, VBOOST ≈ VCC + VBAT, enabling low RON (~0.15–0.25Ω) and high efficiency. The datasheet states: "BOOST pin is used to bootstrap and drive the switch power NPN transistor to a low on-voltage for low power dissipation," and recommends connecting it to a 3V–6V source for optimal performance-critical for sustaining 2A continuous output.
Does the LT1769CGN#TRPBF support charging multiple battery chemistries?
Yes, the LT1769CGN#TRPBF is explicitly designed for Li-ion, NiMH, and NiCd batteries, as stated in the title and Features section: "Simple Solution to Charge NiCd, NiMH and Lithium Rechargeable Batteries." Its dual-loop architecture adapts to each chemistry: constant-voltage termination for Li-ion (via OVP), ΔT or –dV/dt-compatible current control for NiMH/NiCd (via PROG programming), and adjustable undervoltage lockout for varying adapter profiles. Application circuits for all three are provided in the datasheet.
LT1769CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 28-SSOP
LT1769CGN#TRPBF FAQ
1.How can I place an order for LT1769CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1769CGN#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 LT1769CGN#TRPBF reliable?
The price and inventory of LT1769CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1769CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1769CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1769CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1769CGN#TRPBF?
LT1769CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1769CGN#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 LT1769CGN#TRPBF?
For technical support, including LT1769CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1769CGN#TRPBF requirements.
6.How does Aetrix verify that LT1769CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1769CGN#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 LT1769CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1769CGN#TRPBF?
All LT1769CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1769CGN#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 LT1769CGN#TRPBF part is unused and in its original packaging.
Return procedure for LT1769CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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