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Analog Devices Inc. LT1769CGN#PBF
- Part No.:
- LT1769CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1769CGN#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,121
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Product details
Overview
LT1769CGN#PBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage 2A switching battery charger IC for Li-ion, NiMH, and NiCd batteries. It integrates a 3A peak internal NPN switch, delivers ±5% charge current accuracy via resistor or DAC programming, achieves 0.5% reference voltage accuracy for precise CV mode, operates from 8V–28V input, and supports battery voltages up to 20V. It is used in portable medical devices requiring simultaneous system operation and fast charging without adapter overload.
For engineers reviewing the LT1769CGN#PBF datasheet, LT1769CGN#PBF pinout, LT1769CGN#PBF application, or LT1769CGN#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 28-lead SSOP package mapping, real-world adapter current limiting behavior, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The LT1769CGN#PBF implements a current-mode PWM buck topology with three independent control loops: one for battery charge current regulation (via PROG pin and CA1/CA2 amplifiers), one for constant-voltage battery termination (using 2.465V reference and VA amplifier), and one for input adapter current limiting (via CLP/CLN pins and 100mV threshold). Its 200kHz oscillator enables compact magnetics and high efficiency (>94% at 2A into 8.4V Li-ion).
It features adaptive shutdown on adapter removal (3µA reverse battery drain), adjustable undervoltage lockout (6–8V threshold), soft-start via VC pin capacitor (0.33µF typical), and ground-referenced or high-side current sensing-eliminating need for battery-negative grounding constraints. The GN package's exposed paddle provides 35°C/W thermal resistance for sustained 2A operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | 2A DC output (3A peak); enables full-rate charging of 2-cell Li-ion or 12-cell NiMH packs. |
| Reference Voltage Accuracy | ±0.5% at 25°C (±1% over –40°C to 125°C); ensures ±42mV CV regulation tolerance for 8.4V Li-ion float. |
| Input Voltage Range | 8V to 28V; supports universal AC adapters (e.g., 12V/19V laptop supplies) with ≥3V headroom over battery. |
| Switching Frequency | 180–220 kHz (typical 200 kHz); balances EMI, inductor size (22µH typical), and efficiency. |
| Adapter Current Limit Threshold | 100 mV across sense resistor; allows analog closed-loop reduction of charge current to prevent adapter overload. |
| Reverse Battery Drain | 3 µA max when adapter removed; preserves battery life during storage or unplugged operation. |
| Package Thermal Resistance | θJA = 35°C/W (GN 28-lead SSOP with exposed paddle soldered to PCB ground plane); sustains 2A continuous without forced air. |
Pinout & Package
LT1769CGN#PBF is housed in a 28-lead narrow SSOP package (GN) with an exposed thermal paddle fused to internal GND. The paddle must be soldered to an expanded PCB ground land for heat sinking (35°C/W θJA). Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1–3, 7, 8, 14, 15, 22, 26–28) | Power and signal ground reference | All 11 GND pins connect internally to die attach paddle; must be tied to large copper area for thermal and noise performance. |
| SW (Pin 4) | Switch node output | Drives external Schottky catch diode; requires minimal trace length to GND to minimize ringing and EMI. |
| BOOST (Pin 5) | Bootstrap drive for internal NPN switch | Supplies gate drive above VCC; connects to VCC + VBAT during ON time to reduce saturation voltage and conduction loss. |
| UV (Pin 6) | Undervoltage lockout input | Triggers shutdown when adapter drops below 6–8V; hysteresis prevents oscillation near threshold. |
| OVP (Pin 9) | Voltage amplifier input for CV regulation | Monitors battery voltage via R3/R4 divider; compares to 2.465V reference to terminate CC phase. |
| CLP / CLN (Pins 10/11) | Adapter current limit differential inputs | Sense voltage across RS4; 100mV threshold triggers automatic charge current reduction to protect adapter. |
| SENSE / BAT (Pins 13/17) | Battery current sense terminals | Enable high-side or low-side sensing; no ground-referencing required-supports battery negative tied directly to system GND. |
| VC (Pin 20) | Current-mode PWM control voltage | 0.7V threshold starts switching; 1.1V = full 2A; capacitor here sets soft-start ramp rate and filters noise. |
| PROG (Pin 21) | Charge current programming input | Accepts resistor (RPROG) or DAC sink current; IPROG = 2.465V / RPROG × (RS2/RS1) defines IBAT. |
| VCC1–VCC3 (Pins 23–25) | Input supply pins | All three must be shorted near IC; require ≥15µF low-ESR ceramic/tantalum bypass close to pins. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-loop regulation (CC/CV/adapter current) | Enables simultaneous system load operation and battery charging without firmware intervention or adapter derating. |
| 2A integrated switch with 0.15Ω RDS(on) | Eliminates external MOSFET and driver; reduces BOM count and layout complexity in space-constrained designs. |
| 0.5% reference voltage accuracy | Meets stringent Li-ion CV tolerance requirements (±1% total system error) without external trimming or calibration. |
| 3µA battery reverse drain in sleep mode | Extends shelf life of backup batteries in medical monitors and portable diagnostics equipment. |
| Adjustable UVLO with hysteresis | Prevents brown-out oscillation during unstable adapter conditions; configurable from 6V to >20V via resistor divider. |
| High-side or low-side current sensing | Removes requirement for battery negative to float; simplifies integration into existing system ground architectures. |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: A handheld ECG monitor operates continuously while recharging its 7.4V Li-ion pack from a 12V wall adapter. IC Role / Device Role / Timing Role: LT1769CGN#PBF regulates 2A CC charge until 8.4V, then transitions to CV mode; concurrently limits adapter draw to 1.8A to avoid tripping its 2A OCP. Use Value: Enables uninterrupted clinical data acquisition during charging-no user interruption or power cycling required. |
Use Scenario: A rugged barcode scanner uses NiMH batteries and must charge rapidly between shifts using a shared 19V industrial adapter. IC Role / Device Role / Timing Role: LT1769CGN#PBF delivers 2A CC charge to 12-cell NiMH stack (14.4V), with programmable -dV/dt termination via OVP feedback. Use Value: Achieves >90% state-of-charge in <45 minutes while preventing overcharge damage through precision voltage regulation. |
| Emergency Response Radios | Field-Deployable Test Equipment |
|
Use Scenario: A PTT radio with dual 3.7V Li-ion cells charges from vehicle 12V system while transmitting. IC Role / Device Role / Timing Role: LT1769CGN#PBF senses battery current at high side, maintains 2A charge under 5A system load, and shuts down cleanly when ignition is turned off. Use Value: Eliminates need for separate power path manager; radio remains operational and charging completes before shift change. |
Use Scenario: A portable oscilloscope charges its 14.8V Li-ion pack from a lab bench supply while running self-calibration routines. IC Role / Device Role / Timing Role: LT1769CGN#PBF uses DAC-programmed PROG input to dynamically scale charge current based on internal temperature sensor readings. Use Value: Prevents thermal runaway during high-ambient-temperature field use by reducing IBAT from 2A to 0.8A above 45°C. |
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 MOSFETs; supports higher voltage (up to 32V) and current (up to 10A); includes SMBus interface. | Used in server backup batteries and high-power portable instruments where programmability and telemetry are critical. | Select LTC4000-1 only if external FET control, digital configuration, or >2A output is required-adds complexity and cost vs. LT1769CGN#PBF's integrated solution. |
| BQ24610RGTR | Fixed 200kHz frequency; no adapter current limiting loop; lower reference accuracy (±0.75%); 28-pin TSSOP only. | Targeted at cost-sensitive consumer electronics where adapter coexistence is managed externally or not required. | Choose BQ24610RGTR for simplified, lower-cost designs without simultaneous load/charge demands-but verify CV tolerance meets battery spec. |
Compared with LTC4000-1 and BQ24610RGTR, the LT1769CGN#PBF uniquely integrates adapter current limiting, high-accuracy CV regulation, and a 2A switch in a single 28-lead SSOP-making it optimal for industrial and medical portable devices needing robust, autonomous charging without microcontroller supervision.
Availability
LT1769CGN#PBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, emergency response radios, and field-deployable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1769CGN#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, serving precision instrumentation, healthcare, and industrial markets.
The LT1769CGN#PBF belongs to Linear's legacy battery management IC portfolio, designed specifically for autonomous, high-efficiency charging of multi-chemistry rechargeable batteries in space- and reliability-constrained portable systems.
FAQ
What is the maximum battery voltage supported by the LT1769CGN#PBF?
The LT1769CGN#PBF supports battery voltages from 1V to 20V, enabling direct charging of configurations ranging from single-cell Li-ion (4.2V) to 12-cell NiMH (14.4V) or 6-cell lead-acid (12.6V). Its OVP amplifier and 2.465V reference allow precise CV regulation across this range using appropriate resistor dividers on the OVP pin.
Can the LT1769CGN#PBF operate without an external catch diode?
Yes-the LT1769CGN#PBF enters sleep mode with only 3µA reverse battery drain when the adapter is disconnected, eliminating the need for an external blocking diode. However, an external Schottky diode (e.g., SS24) is required at the SW pin during active operation to provide the catch path for inductor current.
How does the LT1769CGN#PBF implement adapter current limiting?
The LT1769CGN#PBF uses differential inputs CLP and CLN to monitor voltage across a sense resistor (RS4) in the adapter path. When this voltage exceeds 100mV, the CL1 amplifier overrides the programmed charge current to maintain adapter current at 100mV/RS4-enabling dynamic reduction of IBAT while sustaining system load operation.
What is the purpose of the exposed thermal paddle on the LT1769CGN#PBF GN package?
The exposed paddle on the LT1769CGN#PBF GN package is electrically connected to internal GND and serves as the primary thermal path. Soldering it to a large PCB ground plane achieves θJA = 35°C/W, allowing continuous 2A operation at ambient temperatures up to 70°C without heatsinks or airflow.
Does the LT1769CGN#PBF support both high-side and low-side current sensing?
Yes-the LT1769CGN#PBF accepts current sense signals at either the SENSE or BAT pin, enabling flexible placement of the sense resistor on the battery's positive (high-side) or negative (low-side) terminal. This eliminates ground-referencing constraints and simplifies integration into systems where battery negative is tied to chassis ground.
LT1769CGN#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LT1769CGN#PBF FAQ
1.How can I place an order for LT1769CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1769CGN#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 LT1769CGN#PBF reliable?
The price and inventory of LT1769CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1769CGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1769CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1769CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1769CGN#PBF?
LT1769CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1769CGN#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 LT1769CGN#PBF?
For technical support, including LT1769CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1769CGN#PBF requirements.
6.How does Aetrix verify that LT1769CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1769CGN#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 LT1769CGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1769CGN#PBF?
All LT1769CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1769CGN#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 LT1769CGN#PBF part is unused and in its original packaging.
Return procedure for LT1769CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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