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Texas Instruments TPS6755IDR
- Part No.:
- TPS6755IDR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS6755IDR.pdf
- Description:
- IC REG BUCK BST ADJ 270MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
TPS6755IDR from Texas Instruments is an adjustable inverting DC/DC converter IC with a 160-kHz fixed-frequency current-mode PWM controller, 0.4-Ω p-channel MOSFET power switch, and 1.22-V reference output. It operates from 2.7 V to 9 V input, delivers up to 200 mA load current at –5 V output, and achieves 78% typical efficiency in battery-powered peripherals and board-level negative rail generation.
For engineers reviewing the TPS6755IDR datasheet, TPS6755IDR pinout, TPS6755IDR application, or TPS6755IDR equivalent, key selection considerations include its inverting topology, EN-controlled 1-µA shutdown current, soft-start capability via external capacitor, and compatibility with standard Schottky rectifiers and low-ESR tantalum output capacitors.
Technical Context
The TPS6755IDR implements a current-mode PWM architecture with integrated 160-kHz oscillator, slope-compensated current sensing, and error amplifier feedback referenced to a stable 1.22-V internal reference. Its p-channel MOSFET switch features 0.4-Ω RDS(on) and is driven using the converter's inverted output voltage to minimize die area.
Functional blocks include an overcurrent comparator (2-A peak trip), SS clamp for controlled start-up, and dedicated COMP pin for loop compensation with 82-pF capacitor. The EN input enables full shutdown with discharge path for the soft-start capacitor through a 1.2-MΩ internal resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Inverting DC/DC converter - generates negative output voltage referenced to input ground. |
| Input Voltage Range | 2.7 V to 9 V - supports single-cell Li-ion, 3.3-V, and 5-V rails without external regulation. |
| Output Voltage Limit | |VO| ≤ 12 V – VCC - constrains maximum negative output based on supply voltage (e.g., –5 V at VCC = 5 V). |
| Switching Frequency | 160 kHz fixed - enables predictable EMI filtering and consistent inductor sizing (10 µH standard). |
| Quiescent Current | 1.9 mA no-load / 1 µA shutdown - minimizes battery drain during idle or standby modes. |
| Reference Output | 1.22 V ±1%, 125 µA max - provides precision bias for external circuits or feedback divider scaling. |
| Power Switch | 0.4 Ω p-channel MOSFET - reduces conduction loss and eliminates need for external high-side driver. |
Pinout & Package
TPS6755IDR is housed in an 8-pin SOIC (D) package per JEDEC MS-012, tape-and-reel format (2500 pcs/reel), with lead finish NIPDAU and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic-high (>2 V) enables operation; logic-low (≤0.4 V) forces 1-µA shutdown and discharges SS capacitor. |
| REF (Pin 2) | 1.22-V reference output | Stable voltage source for external loads ≤125 µA; requires 10-µF bypass capacitor to GND for noise immunity. |
| SS (Pin 3) | Soft-start timing node | Capacitor to GND controls ramp rate of output voltage rise; internally pulled to REF via 1.2-MΩ resistor. |
| COMP (Pin 4) | Error amplifier compensation | Connects to GND via 82-pF capacitor to stabilize feedback loop for loads >100 mA. |
| FB (Pin 5) | Feedback input | Connects to output node via resistive divider; regulates output by comparing divided voltage to 1.22-V reference. |
| GND (Pin 6) | Power and signal ground | Common return for VCC, OUT, REF, SS, COMP, FB, and EN; requires low-impedance PCB ground plane. |
| OUT (Pin 7) | Power switch drain | High-current switching node connected to inductor and Schottky rectifier cathode; peak current up to 2 A. |
| VCC (Pin 8) | Supply input | Primary power input (2.7–9 V); bypassed with 1-µF ceramic + 47-µF tantalum capacitors placed near the pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable inverting output | Output voltage set externally via two-resistor divider (e.g., –5 V, –2 V, –9 V), limited by |VO| ≤ 12 V – VCC. |
| Integrated 0.4-Ω p-channel MOSFET | Eliminates external high-side switch and gate driver; reduces BOM count and layout complexity. |
| 160-kHz current-mode PWM control | Provides inherent cycle-by-cycle current limiting and stable operation across line/load variations. |
| 1.22-V precision reference | Enables accurate feedback scaling and supports external analog circuitry without additional voltage sources. |
| Soft-start with external capacitor | Prevents inrush current and output overshoot; delay time programmable via SS-to-GND capacitance (e.g., 0.1 µF ≈ 10 ms). |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered handheld ECG or pulse oximeter requiring isolated negative bias for op-amp front-end stages. IC Role / Device Role / Timing Role: Inverting DC/DC converter generating stable –5 V rail from 3.3-V system supply. Use Value: Enables rail-to-rail analog signal conditioning with minimal quiescent current draw (<2 mA active, 1 µA shutdown), extending battery life. |
Use Scenario: 16-bit ADC module in PLC I/O card needing clean negative reference voltage for bipolar input range. IC Role / Device Role / Timing Role: Precision inverting regulator supplying –5 V to ADC reference buffer and op-amp bias network. Use Value: Delivers low-noise, well-regulated negative rail with <0.4% load/line regulation - critical for sub-LSB measurement accuracy. |
| Computer Peripherals | Test & Measurement Equipment |
Use Scenario: USB-powered external HDD dock requiring dual-rail (±5 V) for legacy IDE interface logic. IC Role / Device Role / Timing Role: Compact inverting converter generating –5 V from +5-V USB bus, paired with linear regulator for +5 V. Use Value: Achieves 78% efficiency at 100 mA load while fitting within tight board space - avoids thermal derating in enclosed enclosures. |
Use Scenario: Benchtop multimeter front-end with auto-ranging circuitry demanding stable negative supply for analog switches and comparators. IC Role / Device Role / Timing Role: Primary inverting power stage delivering –5 V at up to 200 mA with fast enable response (<100 µs) for power sequencing. Use Value: EN pin allows synchronized startup/shutdown with main controller, reducing system-level power-up transients and improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX755CPA+ | Pin-for-pin compatible per datasheet; same 160-kHz frequency, but uses n-channel MOSFET with external bootstrap capacitor. | Requires external high-side drive components; slightly higher BOM cost and layout sensitivity. | Preferred when legacy MAX755 design reuse is required; not recommended for new designs due to added external components. |
| TPS6735IDR | Successor device with improved 85% efficiency, wider 1.8–10-V input range, and lower 0.3-Ω RDS(on), but different pinout and no REF output. | Lacks 1.22-V reference pin - requires external reference if feedback scaling or auxiliary bias needed. | Recommended for new designs prioritizing efficiency and input flexibility; avoid if REF functionality or pin compatibility is mandatory. |
Compared with MAX755CPA+, TPS6755IDR integrates the gate drive and eliminates bootstrap components, simplifying layout; compared with TPS6735IDR, it retains the REF output and pin compatibility but trades off ~7% efficiency and narrower input range.
Availability
TPS6755IDR is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and computer peripherals requiring stable component supply with long-term lifecycle support.
Supply support for TPS6755IDR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The TPS6755 belongs to TI's legacy inverting DC/DC converter product line, designed specifically for compact, efficient generation of negative rails in space-constrained, battery-sensitive applications like peripherals and instrumentation.
FAQ
What is the maximum allowable output voltage magnitude for TPS6755IDR?
The TPS6755IDR limits |VO| to ≤ 12 V – VCC. For example, with VCC = 5 V, the maximum negative output is –7 V; at VCC = 2.7 V, it is –9.3 V. This constraint ensures safe operation of the internal p-channel MOSFET and prevents overstress of the OUT-to-VCC junction. Exceeding this limit risks permanent damage to the TPS6755IDR.
Can TPS6755IDR operate from a 2.7-V input and still deliver 200 mA output current?
No - at VCC = 2.7 V, the TPS6755IDR supports only up to 125 mA load current, as confirmed by Figure 10 in the datasheet. Full 200 mA capability requires VCC ≥ 4.5 V. Attempting 200 mA at 2.7 V causes output voltage droop and potential instability due to insufficient headroom for the 0.4-Ω switch and rectifier losses.
Is the 1.22-V reference on TPS6755IDR buffered and usable for external circuits?
Yes - the REF pin on TPS6755IDR provides a buffered 1.22-V output capable of sourcing up to 125 µA. It is explicitly specified for external loading and requires a 10-µF capacitor to GND for noise suppression. This reference is used directly in the feedback divider and can bias external comparators or ADC references without additional regulation.
Does TPS6755IDR require an external Schottky diode, and what are the key selection criteria?
Yes - TPS6755IDR requires an external Schottky rectifier (e.g., 1N5817) connected between OUT and the output capacitor. Key criteria include 1-A continuous current rating, ≤20-V reverse voltage, and low forward voltage (<0.45 V at 1 A) to maintain efficiency. Silicon rectifiers may be used only if ultra-low leakage is required, though they reduce efficiency.
How does the soft-start function work on TPS6755IDR, and what capacitor value is recommended for a 20-ms startup time?
The TPS6755IDR implements soft-start by charging an external capacitor (CSS) from the REF pin via a 1.2-MΩ internal resistor. Based on Figure 13, a 0.22-µF capacitor yields ~20 ms delay. CSS must be ≥10 nF for correct current limiting; values larger than 1 µF increase delay but risk excessive start-up time under light loads. The SS pin must not be left floating.
TPS6755IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- -1.22V
- Voltage - Output (Max):
- -9.3V
- Current - Output:
- 270mA
- Frequency - Switching:
- 160kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS6755IDR FAQ
1.How can I place an order for TPS6755IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS6755IDR 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 TPS6755IDR reliable?
The price and inventory of TPS6755IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS6755IDR is usually 5 days.
3.What payment methods are accepted for TPS6755IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS6755IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS6755IDR?
TPS6755IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS6755IDR 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 TPS6755IDR?
For technical support, including TPS6755IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS6755IDR requirements.
6.How does Aetrix verify that TPS6755IDR is sourced from the original manufacturer or authorized distributors?
All TPS6755IDR 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 TPS6755IDR meets industry standards.
7.What is the process for return or replacement of TPS6755IDR?
All TPS6755IDR units undergo pre-shipment inspection (PSI). If there is an issue with TPS6755IDR, 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 TPS6755IDR part is unused and in its original packaging.
Return procedure for TPS6755IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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