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Texas Instruments TPS6755ID
- Part No.:
- TPS6755ID
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS6755ID.pdf
- Description:
- IC REG BUCK BST ADJ 270MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:201
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Product details
Overview
TPS6755ID 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 features EN-controlled shutdown (1 µA quiescent current). It is used in battery-powered peripherals and board-level negative rail generation.
For engineers reviewing the TPS6755ID datasheet, TPS6755ID pinout, TPS6755ID application, or TPS6755ID equivalent, key selection considerations include its inverting topology, SOIC-8 package, soft-start capability via external capacitor, output voltage adjustability using FB/REF resistive divider, and compatibility with Schottky rectifiers and low-ESR tantalum output capacitors.
Technical Context
The TPS6755ID implements a current-mode PWM control architecture with internal slope compensation, a 160-kHz oscillator, and overcurrent protection that trips at 2 A peak switch current. Its error amplifier compares FB voltage against a 1.22-V internal reference, while the SS pin enables controlled startup via external capacitor charging through a 1.2-MΩ internal pull-up.
Gate drive leverages the converter's negative output voltage to bias the p-channel MOSFET, eliminating need for charge pump. The COMP pin requires an 82-pF capacitor to ground for loop stability with loads >100 mA, and the OUT pin connects directly to the MOSFET drain-requiring careful PCB layout to minimize switching noise coupling into GND or FB.
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 LDO pre-regulation. |
| Output Voltage Range | |VO| ≤ 12 V – VCC - limits maximum achievable negative output based on supply voltage (e.g., –5 V at VCC = 5 V). |
| Switching Frequency | 160 kHz fixed - enables use of compact 10 µH inductor and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 78% typical at 100 mA - balances switching loss and conduction loss for mid-power portable applications. |
| Quiescent Current | 1.9 mA no-load / 1 µA shutdown - extends battery life during standby in always-on systems. |
| Reference Output | 1.22 V ±1%, 125 µA max - provides stable feedback reference and can power external circuitry like bias networks. |
Pinout & Package
TPS6755ID is housed in an 8-pin SOIC (D) package per JEDEC MS-012, with gull-wing leads, 1.27 mm pitch, and 5.00 mm × 6.20 mm body dimensions. Pin 1 is located at top-left corner when notch or mark faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic-high (>2 V) enables operation; logic-low (≤0.4 V) shuts down all internal circuitry and reduces supply current to ≤10 µA. |
| REF (Pin 2) | 1.22-V reference output | Stable precision voltage source for feedback divider and external analog circuits; capable of sourcing up to 125 µA. |
| SS (Pin 3) | Soft-start timing node | External capacitor controls ramp rate of current limit during startup; internally pulled to REF via 1.2-MΩ resistor. |
| COMP (Pin 4) | Error amplifier compensation | Connects to GND via 82-pF capacitor for loop stability; critical for maintaining regulation under dynamic load conditions. |
| FB (Pin 5) | Feedback input | Connects to output voltage divider; regulates output by forcing COMP node to GND potential via error amplifier action. |
| GND (Pin 6) | Power and signal ground | Common return path for VCC, REF, SS, COMP, FB, and internal current-sense amplifier; requires solid ground plane. |
| OUT (Pin 7) | MOSFET drain connection | High-slew-rate switching node tied to inductor and Schottky rectifier cathode; must be routed away from sensitive analog traces. |
| VCC (Pin 8) | Supply voltage input | Accepts 2.7–9 V input; requires local 1-µF ceramic + 47-µF bulk capacitance placed adjacent to pins for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable inverting output | Output voltage set externally via two-resistor divider between FB, REF, and GND - enables custom negative rails (e.g., –2 V to –9 V). |
| Integrated 0.4-Ω p-channel MOSFET | Eliminates need for external high-side switch; gate driven by negative output voltage - reduces component count and die area. |
| 160-kHz current-mode PWM | Provides inherent cycle-by-cycle current limiting and stable operation across wide input/output ranges without external compensation. |
| 1 µA shutdown current | EN pin disables oscillator, reference, and driver - essential for ultra-low-power modes in battery-backed systems. |
| 1.22-V precision reference | Low-drift (50 ppm/°C), buffered output usable for external biasing - avoids need for separate reference IC in space-constrained designs. |
Applications
| Battery-Powered Instrumentation | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Portable multimeter or handheld data logger requiring dual-rail analog front-end with ±5 V supplies from a single 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: TPS6755ID generates regulated –5 V rail inverted from boosted 5 V intermediate rail; operates only during measurement cycles to conserve battery. Use Value: Enables rail-to-rail op-amp operation and ADC reference stability without adding discrete charge pumps or second-stage regulators. |
Use Scenario: 4–20 mA transmitter with isolated analog inputs needing negative bias for current-sense amplifiers and DAC buffers. IC Role / Device Role / Timing Role: TPS6755ID supplies –4.5 V to instrumentation amplifiers and voltage-controlled current sources in loop-powered field devices. Use Value: Delivers clean, low-noise negative supply with <90 mV ripple at 200 mA - meets IEC 61000-4-5 surge immunity requirements for industrial environments. |
| Computer Peripheral Power | Medical Diagnostic Module |
Use Scenario: USB-powered external audio interface requiring phantom power and analog stage biasing from 5 V bus. IC Role / Device Role / Timing Role: TPS6755ID provides –12 V for op-amp bias and –5 V for digital logic level-shifting in compact SOIC footprint. Use Value: Achieves 78% efficiency at 100 mA load - minimizes thermal rise inside sealed enclosure and eliminates need for heatsinking. |
Use Scenario: Portable ECG monitor with low-noise analog acquisition chain requiring split supplies for front-end filtering and amplification. IC Role / Device Role / Timing Role: TPS6755ID generates –3.3 V rail for anti-aliasing filters and programmable gain amplifiers, synchronized to enable pulses from MCU. Use Value: Soft-start (via 0.1 µF SS capacitor) prevents inrush-induced voltage droop on shared 3.3 V system rail during power-up sequences. |
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; identical 8-pin DIP/SOIC pinout, same 160-kHz frequency and 1.22-V reference, but rated for 0°C to 70°C only. | Not qualified for extended temperature range (–40°C to 85°C); lacks soft-start capacitor option - uses internal fixed ramp. | Select MAX755CPA+ only for commercial-temperature applications where soft-start control is unnecessary and TI sourcing is constrained. |
| LM2662CMX/NOPB | Charge-pump inverter (not inductive); no inductor required, but limited to 100 mA output and lower efficiency (~65% at 50 mA); 2 MHz switching. | Suitable for low-current, space-constrained designs where EMI sensitivity prohibits inductors; cannot support >125 mA loads or |VO| > |VIN|. | Choose LM2662CMX/NOPB when board area is critical and load current remains below 100 mA - avoid when >150 mA or low-noise regulation is required. |
Compared with MAX755CPA+, TPS6755ID offers wider temperature range and user-controllable soft-start; versus LM2662CMX/NOPB, it delivers higher current, better efficiency, and lower output ripple at the cost of inductor placement and layout care.
Availability
TPS6755ID is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor signal conditioning, and computer peripheral power requiring stable component supply with long-term manufacturability.
Supply support for TPS6755ID 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 series was designed specifically for compact, efficient inverting DC/DC conversion in space- and power-constrained applications such as portable test equipment and industrial sensors.
FAQ
What is the maximum allowable output voltage magnitude for TPS6755ID?
The absolute maximum output voltage magnitude for TPS6755ID is limited to |VO| ≤ 12 V – VCC. For example, with VCC = 5 V, the maximum |VO| is 7 V; with VCC = 2.7 V, it is 9.3 V. This constraint arises from internal voltage rating limits on the OUT-to-VCC junction and ensures safe operation of the integrated p-channel MOSFET.
Can TPS6755ID operate from a 3.3 V input to generate –3.3 V output?
Yes, TPS6755ID can operate from a 3.3 V input to generate –3.3 V output. At VCC = 3.3 V, the |VO| ≤ 12 V – VCC limit allows up to –8.7 V, well above –3.3 V. Performance data shows stable regulation at –5 V with VCC ≥ 2.7 V, and load current capability scales with input voltage - delivering ~125 mA at VCC = 3.3 V per Figure 10.
What external components are mandatory for basic TPS6755ID operation?
Seven external components are mandatory: a 10 µH inductor, input capacitor (≥47 µF), output capacitor (≥100 µF), reference bypass capacitor (10 µF), compensation capacitor (82 pF), and two feedback resistors (R4, R5) to set output voltage. A Schottky rectifier (e.g., 1N5817) is also required - no bootstrap capacitor or external MOSFET is needed due to integrated p-channel switch.
How does the soft-start function work on TPS6755ID, and what capacitor value is recommended?
The TPS6755ID soft-start function ramps the current limit threshold via voltage on the SS pin, charged by an internal 1.2-MΩ resistor pulling toward REF. A minimum 10 nF capacitor is required; typical values range from 0.01 µF to 1 µF. Figure 13 shows a 0.1 µF capacitor yields ~30 ms delay at VCC = 5 V - sufficient to prevent inrush into large output capacitors without compromising startup time.
Is TPS6755ID RoHS-compliant and lead-free?
Yes, TPS6755ID is RoHS-compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging addendum, it carries "Level-1-260C-UNLIM" moisture sensitivity rating and is qualified for standard Pb-free reflow profiles up to 260°C peak temperature, making it suitable for modern automated assembly processes.
TPS6755ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
TPS6755ID FAQ
1.How can I place an order for TPS6755ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS6755ID 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 TPS6755ID reliable?
The price and inventory of TPS6755ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS6755ID is usually 5 days.
3.What payment methods are accepted for TPS6755ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS6755ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS6755ID?
TPS6755ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS6755ID 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 TPS6755ID?
For technical support, including TPS6755ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS6755ID requirements.
6.How does Aetrix verify that TPS6755ID is sourced from the original manufacturer or authorized distributors?
All TPS6755ID 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 TPS6755ID meets industry standards.
7.What is the process for return or replacement of TPS6755ID?
All TPS6755ID units undergo pre-shipment inspection (PSI). If there is an issue with TPS6755ID, 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 TPS6755ID part is unused and in its original packaging.
Return procedure for TPS6755ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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