TPS65170 IC Schematic Circuit Diagram & Datasheet

The TPS65170 is a high-performance power management IC (PMIC) specifically designed for LCD TVs and monitor display panels. This IC operates within a flexible input voltage range (VIN) of 8.6V to 14.5V DC. In the comprehensive schematic circuit diagram below, the primary operating power supply voltage is applied directly to pins 27 and 28. The TPS65170 IC generates multiple crucial bias voltage supplies required by modern LCD panels. Before analyzing the detailed circuit layout, let's explore its core features.

TPS65170 IC Features & Technical Specifications

• Package: 28-pin QFN package with a compact 5x5mm dimension
• Input Voltage Range: 8.6V to 14.5V DC
• Switching Frequency: Fixed 750KHz frequency for both boost and buck converters
• Buck Converter Current Limit: 1.5A switch current limit
• Main Boost Converter Output: Maximum capability up to 18V
• Soft-Start Calibration: Programmable soft-start for boost and buck converters
• Isolation Control: Integrated isolation switch signal for external high-side MOSFET
• Reset Generator: Programmable reset pulse to stabilize the signal circuit
• Thermal Protection: Integrated thermal shutdown circuitry
• Charge Pumps: Two regulated charge pump controllers for independent VGH and VGL outputs
• Circuit Safety: Built-in short circuit and overload protection mechanisms via feedback (FB) signaling loops

👉 Looking for alternative PMIC layouts? Check out the TPS65178A IC Circuit Diagram Here.

TPS65170 IC Schematic Circuit Diagram

In the schematic layout illustrated below, note the dedicated grounding blocks: the symbol AGND represents the sensitive analog ground path, while PGND denotes the power ground line intended for high-current switching loops.

TPS65170 IC Schematic Circuit Diagram and Pinout Reference Configuration

Component List & Value Reference

• F1 (Fuse): 1.6A 63V SMD Fuse
• Capacitors: C1, C2, C3 (15.3µF); C4 (0.1µF); C5 (30µF); C6 (10nF); C7 (30µF); C8 (1µF); C9 (10µF); C10, C11 (0.1µF); C12 (22µF); C13, C15, C16 (0.1µF); C17 (0.01µF); C18 (10µF); C19 (44µF).
• Resistors: R1, R2 (100KΩ); R3 (15KΩ); R4 (20KΩ); R5 (100KΩ); R6 (2Ω); R7 (1KΩ); R8 (1.3KΩ); R9 (33KΩ); R10, R11 (100KΩ); R12 (2.2MΩ); R13 (2.4KΩ); R14 (10Ω).

I/O Rail Voltage Details for TPS65170 IC

During normal display operation, a functional mainboard section should register the following diagnostic measurements on the IC output test points:

• VIN (Input Voltage): 8.6V to 14.5V DC
• VGH (Gate High Voltage): +26 Volts DC
• VGL (Gate Low Voltage): -5 Volts DC
• AVDD (Analog Supply Voltage): +16 Volts DC
• VCC (Digital Logic Voltage): +3.3 Volts DC

👉 Diagnostic Link: RT6908 IC Schematic Circuit Diagram & Pinout

TPS65170 IC Pin Functions & Descriptions

1. VL: Decoupling capacitor connection point for the internal low-dropout power regulator.
2, 3. SWB: Inductor switching node for the internal buck converter.
4. CTRLN: Base driver signal output line configured for the external negative charge pump regulator transistor.
5. FBN: Feedback input terminal dedicated to the negative charge pump loop.
6. FBB: Error amplifier feedback input terminal for the buck converter loop.
7. RST: Open-drain output line for the internal reset signal generator.
8, 14. AGND: Analog Ground reference connections.
15. DLY: Delay timing capacitor attachment node for the positive charge pump and primary boost converter.
16. CRST: Precise timing capacitor connection node for adjusting the reset generator window.
17. SS: Soft-Start management node; requires an external capacitor to define ramp times.
18. COMP: Error amplifier compensation network connection to balance the boost converter loop.
19. FB: Core feedback voltage input pin for regulating the main boost output.
20. FBP: Regulation feedback input pin for the positive charge pump loop.
21. CTRLP: Base driver output pin dedicated to controlling the external positive charge pump transistor.
22. GD: Gate driver output line tailored for managing an external isolation MOSFET switch.
23, 24. SW: High-power inductive switching nodes for the integrated boost converter.
25, 26. PGND: Power Ground return paths for internal switching current blocks.
27, 28. VIN: Main operating power supply input pins.

TPS65170 IC Substitutes & Equivalents

The TPS65170 PMIC is widely integrated into commercial LG LCD television panels and desktop flat-panel computer monitors. Direct pinpoint pin-to-pin substitutes can vary significantly depending on panel revisions. We are currently verifying reliable cross-reference part numbers in our testing workshop and will update this technical section as soon as verified data becomes available.

Workshop Reference: Working on a similar display architecture? Make sure to view our step-by-step master schematics for the TPS65175 IC Schematic Circuit Diagram, Datasheet, and Pinout.

Thank you for choosing Ornate Pixels for your advanced display repair references!