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Analog Devices Inc. LT1769IGN#TRPBF
- Part No.:
- LT1769IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1769IGN#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
LT1769IGN#TRPBF 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 2A DC / 3A peak internal NPN switch, delivers 0.5% voltage regulation accuracy, supports input current limiting via CLP/CLN pins, operates from 8V–28V VCC, and charges batteries from 1V to 20V. It is used in portable medical devices requiring simultaneous system operation and fast battery recharge.
For engineers reviewing the LT1769IGN#TRPBF datasheet, LT1769IGN#TRPBF pinout, LT1769IGN#TRPBF application, or LT1769IGN#TRPBF equivalent, key selection criteria include its 200kHz current-mode PWM architecture, dual-loop (battery current + adapter current) control, exposed-pad 28-lead SSOP thermal performance (θJA = 35°C/W), and ±0.5% reference voltage accuracy over temperature.
Technical Context
The LT1769IGN#TRPBF implements a synchronous buck topology with current-mode PWM control, using an internal 2A-rated NPN switch and external Schottky catch diode. Its three independent control loops regulate battery charge current (via PROG/SENSE/BAT), battery float voltage (via OVP/VA amplifier with 2.465V reference), and input adapter current (via CLP/CLN at 100mV threshold).
It features adaptive soft-start via VC pin (0.33µF capacitor), undervoltage lockout with 6.7V rising threshold and 0.5V hysteresis on UV pin, and automatic sleep mode reducing reverse battery drain to 3µA when VCC is removed. The BOOST pin drives the NPN base to minimize saturation voltage and conduction loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current | 2A DC continuous (3A peak); programmable ±5% via resistor or DAC at PROG pin |
| Constant-Voltage Accuracy | ±0.5% at 25°C (±1% over –40°C to 125°C); enables precise Li-ion float voltage control |
| Switching Frequency | 200kHz typical (170–230kHz over temp); balances efficiency, inductor size, and EMI |
| Input Voltage Range | 8V to 28V at VCC pins; requires ≥3V headroom above VBAT for proper operation |
| Battery Voltage Range | 1V to 20V; supports single-cell Li-ion up to 5-series NiMH/NiCd packs |
| Reverse Battery Drain | 3µA typical in sleep mode; eliminates parasitic discharge when wall adapter is disconnected |
| Thermal Resistance | θJA = 35°C/W (GN package); requires soldered exposed pad to PCB ground plane for heat sinking |
Pinout & Package
The LT1769IGN#TRPBF is housed in a 28-lead narrow SSOP package with exposed ground paddle (3.0 mm × 4.1 mm), requiring soldering to an 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) | Ground reference and thermal path | All GND pins connect internally to die attach paddle; must be soldered to large PCB ground area for heat dissipation |
| SW (Pin 4) | Switch node output | Drives external Schottky catch diode; high dv/dt node requiring short layout to GND |
| BOOST (Pin 5) | NPN base drive bootstrap | Supplies base current to internal NPN; VBOOST ≈ VCC + VBAT during ON time |
| UV (Pin 6) | Undervoltage lockout input | Triggers shutdown at 6.7V rising threshold; hysteresis prevents chatter near threshold |
| OVP (Pin 9) | Voltage amplifier input | Monitors battery voltage via R3/R4 divider; compares to 2.465V reference for CV mode transition |
| CLP / CLN (Pins 10/11) | Adapter current limit sense inputs | Differential pair measuring voltage across RS4; 100mV threshold enables simultaneous load + charge |
| SENSE / BAT (Pins 13/17) | Battery current sense inputs | Supports high-side or low-side sensing; CA1 amplifier rejects common-mode offset up to VCC – 2V |
| PROG (Pin 21) | Charge current programming input | Accepts current source (DAC or resistor network); sets IBAT = 2.465V / RPROG × (RS2/RS1) |
| VC (Pin 20) | Current loop control voltage | 0.7V threshold starts switching; 1.1V = full current; capacitor here controls soft-start ramp rate |
Key Features
| Feature | Design Value |
|---|---|
| Triple-loop regulation | Simultaneous control of battery charge current, battery voltage, and adapter input current-enables concurrent system operation without adapter overload |
| Low reverse battery drain | 3µA sleep-mode current when VCC is removed-preserves battery capacity during storage or unplugged use |
| Flexible current sensing | SENSE and BAT pins support sensing at either battery terminal-eliminates need for ground-referenced shunt and simplifies PCB layout |
| Programmable undervoltage lockout | Adjustable UV threshold via external resistor divider-prevents operation below minimum adapter voltage required for full system + charge load |
| Integrated soft-start | Controlled by 0.33µF capacitor on VC pin-limits inrush current and prevents adapter current limit tripping during startup |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Battery-powered ECG monitor operating continuously while charging from a 12V wall adapter. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger managing Li-ion pack; regulates adapter current to avoid tripping 2A supply limit during peak display + sensor activity. Use Value: Enables uninterrupted clinical data acquisition during recharge-no system shutdown or user interruption required. |
Use Scenario: Rugged barcode scanner with hot-swappable Li-ion battery, recharged via USB-C PD adapter delivering 15V/2A. IC Role / Device Role / Timing Role: Primary battery management IC; uses CLP/CLN feedback to cap total input draw at 1.8A, reserving 0.2A for host MCU and radio. Use Value: Guarantees reliable adapter compatibility across field-deployed units without custom firmware power arbitration. |
| Emergency Response Radios | Test & Measurement Portable Analyzers |
|
Use Scenario: TETRA radio with 3S Li-ion pack, charged from vehicle 24V system while transmitting. IC Role / Device Role / Timing Role: High-efficiency buck charger with 28V VCC tolerance; senses battery current at high-side to maintain isolated ground for RF front-end. Use Value: Prevents RF noise coupling into battery sense path-maintains <1% charge current accuracy under 10W transmit bursts. |
Use Scenario: Battery-operated oscilloscope with dual chemistry support (Li-ion for field use, NiMH for lab backup). IC Role / Device Role / Timing Role: Universal charger IC; reconfigured via microcontroller DAC on PROG pin to deliver 2A (Li-ion) or 1A (NiMH) with same hardware. Use Value: Reduces BOM count and qualification effort-single design supports two battery chemistries without layout change. |
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 integrated MOSFET, 3.3V–32V battery range; no adapter current limiting loop | Lacks CLP/CLN-based input current regulation-requires external circuitry for simultaneous load + charge | Choose when higher input voltage (e.g., automotive 24V) is needed and adapter current limiting is handled elsewhere |
| BQ24610RGTT | 3.5A max charge current, integrated MOSFETs, 4.5V–28V input; fixed 200kHz frequency, no BOOST pin | Uses synchronous rectification instead of external diode; lacks programmable UV lockout and flexible current-sense topology | Prefer for cost-sensitive designs where high integration and footprint reduction outweigh flexibility in sensing and adapter management |
Compared with LT3652IMSE#TRPBF and BQ24610RGTT, the LT1769IGN#TRPBF uniquely provides three independent analog control loops (battery current, battery voltage, adapter current) in a single IC-enabling true concurrent operation without firmware intervention or external current-limiting components.
Availability
LT1769IGN#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, emergency radios, and test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for LT1769IGN#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 its precision analog portfolio, including high-performance power management ICs designed for demanding industrial and medical applications.
The LT1769 belongs to Linear's dedicated battery charger IC product line, engineered specifically for multi-chemistry (Li-ion/NiMH/NiCd), high-accuracy, and adapter-aware charging in space-constrained portable systems.
FAQ
What is the maximum battery voltage supported by the LT1769IGN#TRPBF?
The LT1769IGN#TRPBF supports battery voltages from 1V to 20V, enabling use with single-cell Li-ion (up to 4.2V), 3S Li-ion (up to 12.6V), and 5-series NiMH/NiCd packs (up to ~10V). Its OVP amplifier and 2.465V reference allow precise float voltage setting across this full range when configured with appropriate R3/R4 dividers. The LT1769IGN#TRPBF does not support lead-acid or higher-voltage chemistries beyond 20V.
Can the LT1769IGN#TRPBF operate without an external Schottky diode?
No-the LT1769IGN#TRPBF requires an external Schottky catch diode (e.g., SS24 or MBRS130LT3) connected between SW and GND. Unlike synchronous buck controllers, it lacks a second integrated switch; the diode provides the return current path during switch OFF time. Omitting it causes catastrophic failure due to inductive kickback at the SW pin. The LT1769IGN#TRPBF datasheet explicitly specifies D2/D3 in all reference designs.
How does the LT1769IGN#TRPBF achieve simultaneous system operation and battery charging?
The LT1769IGN#TRPBF achieves simultaneous operation using its third control loop: the adapter current limiter. By sensing total input current via CLP/CLN pins and dynamically reducing charge current when the 100mV threshold is exceeded, it ensures the wall adapter never exceeds its rated output. This closed-loop analog regulation-distinct from digital load-sharing algorithms-allows full system load and charging to coexist without firmware coordination. The LT1769IGN#TRPBF implements this entirely in hardware.
What is the purpose of the BOOST pin on the LT1769IGN#TRPBF?
The BOOST pin on the LT1769IGN#TRPBF supplies base drive to the internal NPN power switch. It is bootstrapped to ≈ VCC + VBAT during switch ON time, ensuring deep saturation and minimizing VCE(sat)-which directly reduces conduction loss and improves efficiency. Proper BOOST routing (short trace, local 0.1µF ceramic cap to VCC) is critical; incorrect implementation causes excessive junction temperature and premature thermal shutdown. The LT1769IGN#TRPBF datasheet specifies BOOST voltage and current requirements in absolute maximum ratings.
Does the LT1769IGN#TRPBF require external compensation components?
Yes-the LT1769IGN#TRPBF requires external compensation on two nodes: a 0.33µF capacitor from VC to GND for soft-start timing and loop stability, and RC networks on COMP1 (for adapter current loop) and COMP2 (for battery voltage loop) per the Figure 1 schematic. These are not optional; omitting them causes instability, oscillation, or failure to regulate. The LT1769IGN#TRPBF datasheet provides exact values (e.g., 300Ω + 0.47µF on COMP1) validated for 2A Li-ion charging.
LT1769IGN#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LT1769IGN#TRPBF FAQ
1.How can I place an order for LT1769IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1769IGN#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 LT1769IGN#TRPBF reliable?
The price and inventory of LT1769IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1769IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1769IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1769IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1769IGN#TRPBF?
LT1769IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1769IGN#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 LT1769IGN#TRPBF?
For technical support, including LT1769IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1769IGN#TRPBF requirements.
6.How does Aetrix verify that LT1769IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1769IGN#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 LT1769IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1769IGN#TRPBF?
All LT1769IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1769IGN#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 LT1769IGN#TRPBF part is unused and in its original packaging.
Return procedure for LT1769IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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