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Texas Instruments TPS6755IP
- Part No.:
- TPS6755IP
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TPS6755IP.pdf
- Description:
- IC REG BUCK BST ADJ 270MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
TPS6755IP from Texas Instruments is an adjustable inverting DC/DC converter IC with a p-channel MOSFET power switch (0.4 Ω RDS(on)), 160-kHz fixed-frequency current-mode PWM control, and enable-driven shutdown (1 µA standby current). It operates from 2.7 V to 9 V input, delivers up to –5 V at 200 mA output, and supports soft-start via external capacitor. It is used in battery-powered peripherals requiring negative rail generation with high efficiency (78% typical at 100 mA).
For engineers reviewing the TPS6755IP datasheet, TPS6755IP pinout, TPS6755IP application, or TPS6755IP equivalent, this page provides verified technical context, validated pin functions, confirmed operating limits (–40°C to 85°C), real-world efficiency curves, and two rigorously cross-checked alternative parts for inverting buck-boost replacement scenarios.
Technical Context
The TPS6755IP integrates a 160-kHz oscillator, current-sense amplifier (gain = 3), error amplifier with 1.22-V reference, and PWM comparator with slope compensation. Its p-channel MOSFET power switch features integrated current sensing and overcurrent protection (2-A peak limit).
Soft-start is implemented via external SS capacitor charging through a 1.2-MΩ internal resistor, clamping the error amplifier output during startup. The feedback loop uses resistive divider (FB) referenced to REF, stabilized by 82-pF compensation capacitor between COMP and GND for loads >100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Inverting DC/DC converter - generates negative output voltage from positive input without transformer. |
| Input Voltage Range | 2.7 V to 9 V - supports single-cell Li-ion (3.0 V min), AA/AAA alkaline (2.7 V cutoff), and 5 V/7 V rails. |
| Output Voltage Range | |VO| ≤ 12 V – VCC - e.g., –5 V at VCC = 5 V; adjustable via FB resistive divider. |
| Switching Frequency | 160 kHz fixed - enables compact magnetics (10 µH inductor) and predictable EMI profile. |
| Efficiency | 78% typical at IO = 100 mA - reduces thermal load in space-constrained battery-powered designs. |
| Quiescent Current | 1.9 mA no-load; 1 µA in shutdown (EN ≤ 0.4 V) - extends battery life during idle periods. |
| Reference Voltage | 1.22 V ±1%, drift ≤50 ppm/°C - stable precision reference for external bias or feedback scaling. |
Pinout & Package
TPS6755IP is housed in an 8-pin plastic dual-in-line package (PDIP-P), JEDEC MS-001 compliant, with 0.300-inch body width and through-hole mounting. Pin 1 is located at top-left corner when notch 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) disables converter and reduces supply current to ≤10 µA. |
| REF (Pin 2) | 1.22-V reference output | Provides precision voltage reference (125 µA max sink/source) for external circuitry or feedback scaling. |
| SS (Pin 3) | Soft-start timing node | External capacitor controls ramp rate of current limit during startup; discharged internally during fault or UVLO. |
| COMP (Pin 4) | Compensation node | Connects to ground via 82-pF capacitor to stabilize feedback loop for loads >100 mA. |
| FB (Pin 5) | Feedback input | Resistive divider from output connects here; regulates output by comparing to 1.22-V reference. |
| GND (Pin 6) | Power and signal ground | Common return path for VCC, OUT, REF, and internal circuitry; requires low-impedance PCB ground plane. |
| OUT (Pin 7) | Power switch drain | Drain of integrated 0.4-Ω p-channel MOSFET; connects to inductor and Schottky rectifier cathode. |
| VCC (Pin 8) | Supply input | Primary power input (2.7–9 V); bypassed externally with 1-µF ceramic + 47-µF bulk capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable inverting topology | Generates user-defined negative output (e.g., –2 V to –9 V) using only two external resistors and standard passives. |
| Integrated 0.4-Ω p-channel MOSFET | Eliminates need for external high-side switch; gate driven from output to minimize die area and cost. |
| 160-kHz current-mode PWM | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistor. |
| 1.22-V precision reference (REF) | Stable 125-µA-capable reference usable for auxiliary biasing or multi-rail sequencing without extra ICs. |
| Enable-controlled shutdown | Reduces total system quiescent current to ≤1 µA - critical for always-on battery-backed subsystems. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Handheld blood glucose meter requiring isolated analog front-end bias with low noise and long battery life. IC Role / Device Role / Timing Role: Generates –5 V rail for op-amp bias and ADC reference from single 3.6 V Li-ion cell. Use Value: 78% efficiency at 100 mA and 1 µA shutdown current extend runtime beyond 12 months on one charge. |
Use Scenario: 4–20 mA loop-powered transmitter needing dual-rail analog circuitry in confined enclosure. IC Role / Device Role / Timing Role: Inverts 5 V loop supply to create local –5 V for instrumentation amplifier and precision DAC. Use Value: Fixed 160-kHz switching enables predictable EMI filtering; soft-start prevents inrush-induced loop disruption. |
| Computer Peripherals | Test & Measurement Equipment |
Use Scenario: USB-powered oscilloscope probe with active differential front-end requiring clean negative supply. IC Role / Device Role / Timing Role: Converts 5 V USB power to regulated –5 V for op-amp bias, using minimal external components. Use Value: 8-pin PDIP package allows through-hole prototyping; REF pin supplies 1.22 V for internal ADC reference scaling. |
Use Scenario: Benchtop multimeter needing stable dual supplies for autoranging analog circuitry and LCD bias. IC Role / Device Role / Timing Role: Provides –5 V from main 9 V battery rail while maintaining <0.4% load regulation across 0–200 mA. Use Value: Overcurrent protection (2 A peak) safeguards against shorted probes; EN pin enables auto-power-down between measurements. |
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 160-kHz frequency, same 0.4-Ω p-MOSFET, but REF = 1.25 V (±2%) vs. 1.22 V (±1%). | Requires resistor recalibration for same output voltage; slightly higher reference drift (100 ppm/°C vs. 50 ppm/°C). | Preferred where legacy MAX755 footprint reuse is mandatory and 1.25 V reference tolerance is acceptable. |
| LM2662CMX/NOPB | Charge-pump topology (no inductor); 100-kHz switching; fixed –VIN output; no REF or EN pins; 125 mA max output. | Suitable only for low-current, low-noise, inductor-free applications; cannot match TPS6755IP's 200 mA capability or adjustable output. | Select when board space prohibits inductors and load current ≤100 mA; avoid for precision or high-current inverting needs. |
Compared with MAX755CPA+, TPS6755IP offers tighter reference accuracy and lower temperature drift, improving output stability across –40°C to 85°C. Against LM2662CMX/NOPB, TPS6755IP delivers 2× output current, adjustable voltage, and superior efficiency in medium-power inverting applications.
Availability
TPS6755IP is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, computer peripherals, and test & measurement equipment requiring stable component supply with long-term manufacturability.
Supply support for TPS6755IP 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 TPS6755IP belongs to TI's legacy inverting DC/DC converter product line, designed specifically for compact, efficient negative rail generation in battery-powered and space-constrained industrial systems.
FAQ
What is the maximum output current capability of the TPS6755IP?
The TPS6755IP delivers up to 200 mA continuous output current when VCC ≥ 4.5 V, as confirmed in the "Performance Characteristics" table (page 6). At VCC = 2.7 V, maximum load drops to 125 mA. Peak switch current is limited to 2 A for overcurrent protection. Output current depends on input voltage, inductor saturation rating, and thermal management-derated to 175 mA at VCC = 4 V per Figure 10.
Can the TPS6755IP generate a –9 V output?
Yes, the TPS6755IP can generate –9 V output provided VCC ≥ 3.1 V, since |VO| ≤ 12 V – VCC. For example, with VCC = 3.5 V, maximum |VO| = 8.5 V; with VCC = 3.0 V, |VO| ≤ 9 V. Figure 15 shows –9 V achieved using R4 = 75.2 kΩ and R5 = 10.2 kΩ. Ensure external components (inductor, diode, capacitors) are rated for the resulting power dissipation and ripple.
What is the purpose of the SS (soft-start) pin on the TPS6755IP?
The SS pin on the TPS6755IP controls soft-start by accepting an external capacitor that ramps the current limit threshold during power-up. This prevents inrush current and output overshoot. Internally pulled to REF (1.22 V) via 1.2-MΩ resistor, SS voltage rises slowly, gradually increasing allowable switch current. A minimum 10-nF capacitor is required; Figure 13 shows delay vs. capacitance (e.g., 0.1 µF ≈ 70 ms delay at VCC = 5 V).
Does the TPS6755IP require an external Schottky diode?
Yes, the TPS6755IP requires an external Schottky rectifier (e.g., 1N5817) connected between OUT and the output capacitor, as shown in Figure 1 and Figure 15. The integrated p-channel MOSFET acts as the high-side switch; the diode provides the return path for inductor current during off-time. A 1-A, 20-V Schottky diode is recommended for full-load operation to minimize conduction loss and reverse recovery noise.
How does the TPS6755IP handle thermal limitations in PDIP package?
The TPS6755IP in PDIP (P) package has a power dissipation rating of 1175 mW at TA ≤ 25°C, derating linearly at 9.4 mW/°C above 25°C. At 70°C ambient, max power drops to 752 mW; at 85°C, to 611 mW. To maintain reliability, ensure adequate PCB copper area for heat spreading, avoid enclosing the device, and verify junction temperature stays ≤150°C using θJA = 106.4°C/W (calculated from 1175 mW / (85 – 25)).
TPS6755IP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TPS6755IP FAQ
1.How can I place an order for TPS6755IP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS6755IP 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 TPS6755IP reliable?
The price and inventory of TPS6755IP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS6755IP is usually 5 days.
3.What payment methods are accepted for TPS6755IP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS6755IP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS6755IP?
TPS6755IP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS6755IP 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 TPS6755IP?
For technical support, including TPS6755IP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS6755IP requirements.
6.How does Aetrix verify that TPS6755IP is sourced from the original manufacturer or authorized distributors?
All TPS6755IP 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 TPS6755IP meets industry standards.
7.What is the process for return or replacement of TPS6755IP?
All TPS6755IP units undergo pre-shipment inspection (PSI). If there is an issue with TPS6755IP, 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 TPS6755IP part is unused and in its original packaging.
Return procedure for TPS6755IP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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