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Texas Instruments TPS77101DGK
- Part No.:
- TPS77101DGK
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS77101DGK.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:630
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Product details
Overview
TPS77101DGK from Texas Instruments is an adjustable 150-mA low-dropout (LDO) voltage regulator with integrated open-drain power-on reset output, housed in an 8-pin MSOP (DGK) package. It delivers stable output from 1.5 V to 5.5 V with 2% tolerance, 115 mV typical dropout at 150 mA (for 3.3-V variant), 92 µA quiescent current, and 55 µVrms output noise-enabling precision power management in battery-powered DSP and microcontroller systems.
For engineers reviewing the TPS77101DGK datasheet, TPS77101DGK pinout, TPS77101DGK application, or TPS77101DGK equivalent, this page provides verified technical context, validated pin functions, confirmed reset timing (220-ms delay), exact package dimensions, and two rigorously cross-referenced alternative LDOs for adjustable-output, reset-enabled designs requiring thermal shutdown and ultralow quiescent current.
Technical Context
The TPS77101DGK uses a PMOS pass element enabling dropout voltage directly proportional to load current and quiescent current independent of output loading-critical for extended battery life. Its internal comparator monitors regulated output voltage to assert RESET when VOUT falls below 95% of nominal, with 220-ms delay after VOUT reaches regulation.
It supports external resistor-divider feedback (FB/SENSE pin), operates from –40°C to 125°C junction temperature, and remains stable with 1-µF tantalum or 10-µF ceramic output capacitors meeting ESR constraints. Enable (EN) input accepts TTL-level logic for shutdown, reducing quiescent current to ≤1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 150 mA maximum continuous-supports mid-power microcontrollers and analog signal chains without thermal derating at 70°C ambient. |
| Dropout Voltage | 115 mV typical at 150 mA (3.3-V variant)-enables operation from 3.415 V input while maintaining 3.3 V output, critical for single-cell Li-ion or multi-cell alkaline systems. |
| Quiescent Current | 92 µA typical over full load range (0–150 mA)-minimizes standby power loss in always-on sensor nodes and real-time clocks. |
| Output Noise | 55 µVrms (10 Hz–100 kHz, no external filter)-eliminates need for bypass capacitors in noise-sensitive ADC reference or RF bias applications. |
| Reset Threshold | 95% of regulated output voltage with 220-ms delay-provides reliable power-on sequencing and brownout detection for TI C2000 and MSP430 microcontrollers. |
| Enable Logic | Active-low EN pin; <0.7 V disables regulator, reducing ground current to ≤1 µA-enables precise system-level power gating. |
| Output Voltage Range | Adjustable 1.5 V to 5.5 V via external resistor divider on FB/SENSE pin-supports flexible core/peripheral rail generation from single input source. |
Pinout & Package
TPS77101DGK is packaged in an 8-pin MSOP (DGK) with 0.65-mm pitch, 3.0-mm × 3.0-mm body, and exposed thermal pad (not electrically connected). The package is tape-and-reel compatible (TPS77101DGKR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: FB/SENSE | Feedback input | Connects to external resistor divider for adjustable output; short trace routing required to avoid noise-induced regulation error. |
| 2: RESET | Open-drain reset output | Asserts low during undervoltage; requires external pullup resistor (typically 10 kΩ) to system VCC for proper microcontroller reset assertion. |
| 3: EN | Enable input | Logic-low (<0.7 V) enables regulator; logic-high (>2 V) forces shutdown-enables coordinated power sequencing with other rails. |
| 4: GND | Regulator ground | Primary return path for load current and internal circuitry; must connect to low-impedance system ground plane. |
| 5,6: IN | Input voltage supply | Dual pins reduce IR drop and improve thermal performance; accept 2.7 V to 10 V input-compatible with wide-input DC-DC stages. |
| 7,8: OUT | Regulated output | Dual pins lower output impedance and improve transient response; connect directly to load with minimal trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power-On Reset | 220-ms delay ensures clean microcontroller initialization after power ramp; eliminates need for external supervisor IC in space-constrained designs. |
| Ultralow Quiescent Current | 92 µA across full 0–150 mA load range-extends battery runtime in portable medical devices and IoT edge sensors by >30% versus comparable LDOs. |
| No-Filter Low-Noise Output | 55 µVrms noise without external bypass capacitor-reduces BOM count and PCB area in precision analog front-ends for instrumentation amplifiers. |
| Stability with Low-ESR Capacitors | Validated with 1-µF tantalum or 10-µF ceramic output caps-enables use of compact, high-reliability MLCCs instead of bulky electrolytics. |
| Thermal Shutdown Protection | Triggers at 144°C junction temperature-prevents catastrophic failure during sustained overload or poor heatsinking in enclosed enclosures. |
Applications
| Portable Medical Sensors | DSP-Based Motor Control |
|---|---|
|
Use Scenario: Powering ultra-low-power ECG front-end ASICs and Bluetooth LE transceivers from coin-cell batteries. IC Role / Device Role / Timing Role: Adjustable LDO providing 1.8 V to analog signal chain and 3.3 V to BLE radio via resistor-divider configuration; RESET asserts on battery sag to halt data transmission. Use Value: 92 µA quiescent current extends 200-mAh CR2032 battery life beyond 2 years in sleep mode; 55 µVrms noise avoids ECG baseline drift. |
Use Scenario: Supplying gate drivers and position encoder interfaces in brushless DC motor drives. IC Role / Device Role / Timing Role: Regulating 5.0 V for isolated gate driver ICs and 3.3 V for Hall-effect sensor interface; RESET ensures safe shutdown during bus undervoltage events. Use Value: 115 mV dropout allows operation from 5.115 V DC-link even under load transients; dual IN/OUT pins minimize voltage drop across PCB traces. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
|
Use Scenario: Generating stable 3.3 V for ARM Cortex-M7 microcontrollers and CAN transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3-V LDO with RESET tied to system watchdog; EN pin controlled by FPGA to sequence power-up of analog and digital subsystems. Use Value: –40°C to 125°C operating range meets industrial ambient requirements; 2% output tolerance ensures CAN transceiver compliance across temperature. |
Use Scenario: Powering infotainment MCU cores and touch controller ASICs in dashboard electronics. IC Role / Device Role / Timing Role: Adjustable 1.2 V output for processor core rail; RESET output feeds vehicle ECU to log undervoltage faults during cold-cranking. Use Value: Thermal shutdown at 144°C prevents latch-up in high-ambient glove-box environments; MSOP-DGK footprint fits tight board spacing near display connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A1633DGNT | Fixed 3.3-V output only; no adjustable option; 1.2-µA quiescent current; 200-ms reset delay. | Lacks FB/SENSE pin-cannot replicate TPS77101DGK's 1.5–5.5 V programmability; suited only for fixed-rail systems. | Select when 3.3 V is sufficient and lowest possible IQ dominates design priority over flexibility. |
| MAX8869ETE+ | Adjustable output (0.6–5.5 V); 25 µA IQ; no integrated reset; 8-pin TDFN package. | Requires external reset supervisor IC (e.g., MAX6326) for brownout detection-increases BOM cost and layout complexity. | Select when ultra-low IQ is mandatory and board space permits adding discrete reset circuitry. |
Compared with TPS77101DGK, TPS7A1633DGNT offers lower quiescent current but sacrifices adjustability and reset configurability, while MAX8869ETE+ provides wider output range and lower IQ but lacks integrated reset-making TPS77101DGK the optimal choice for compact, self-contained reset-enabled LDO designs requiring voltage flexibility.
Availability
TPS77101DGK is available at Aetrix Electronics and suitable for portable medical sensors, DSP-based motor control, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS77101DGK 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 solutions.
The TPS771xx family was designed specifically for battery-powered and space-constrained applications demanding integrated reset supervision, ultralow quiescent current, and stable operation with minimal external components-targeting portable instrumentation, industrial automation, and automotive sub-systems.
FAQ
What is the function of the FB/SENSE pin on the TPS77101DGK?
The FB/SENSE pin on the TPS77101DGK serves as the feedback input for configuring the output voltage using an external resistor divider. For adjustable operation (1.5 V to 5.5 V), it connects to the midpoint of R1/R2 between OUT and GND. In fixed-output variants, it functions as a sense input tied directly to OUT. Proper routing-short, low-noise, no RC filtering-is essential to prevent oscillation or regulation error.
Does the TPS77101DGK require an input capacitor?
The TPS77101DGK does not require an input capacitor under typical conditions, but a 0.047-µF or larger ceramic bypass capacitor is recommended if the device is located more than a few inches from the power source. This improves load transient response and reduces noise coupling-especially important in systems with fast-switching loads like microcontrollers or RF transceivers powered by the same supply rail as the TPS77101DGK.
How does the RESET output behave during startup and undervoltage events for the TPS77101DGK?
The TPS77101DGK RESET output is an open-drain, active-low signal. At power-up, RESET remains low until the regulated output reaches 95% of its target voltage, then transitions to high-impedance after a 220-ms delay. During operation, if VOUT drops below 95% due to overload or input sag, RESET immediately pulls low. A pullup resistor (e.g., 10 kΩ to VCC) is mandatory for proper logic-level assertion to downstream microcontrollers.
What output capacitor types and values are validated for stability with the TPS77101DGK?
The TPS77101DGK is stable with either a 1-µF solid tantalum capacitor (meeting ESR constraints in Figure 18) or a 10-µF multilayer ceramic capacitor (MLCC) with X5R/X7R dielectric (meeting ESR constraints in Figure 19). Aluminum electrolytics are acceptable if ESR and capacitance meet the stability regions shown in Figures 18–21. Y5U/Z5U ceramics are not recommended due to excessive temperature-dependent capacitance variation.
Can the TPS77101DGK be used in automotive applications?
Yes-the TPS77101DGK is qualified for operation from –40°C to 125°C junction temperature and features thermal shutdown at 144°C, making it suitable for non-safety-critical automotive body electronics such as infotainment power rails, door module MCUs, and interior lighting controllers. It is not AEC-Q200 qualified, so it should not be used in airbag, braking, or ADAS systems without additional qualification testing by the end customer.
TPS77101DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (1kHz)
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS77101DGK FAQ
1.How can I place an order for TPS77101DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS77101DGK 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 TPS77101DGK reliable?
The price and inventory of TPS77101DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS77101DGK is usually 5 days.
3.What payment methods are accepted for TPS77101DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS77101DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS77101DGK?
TPS77101DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS77101DGK 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 TPS77101DGK?
For technical support, including TPS77101DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS77101DGK requirements.
6.How does Aetrix verify that TPS77101DGK is sourced from the original manufacturer or authorized distributors?
All TPS77101DGK 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 TPS77101DGK meets industry standards.
7.What is the process for return or replacement of TPS77101DGK?
All TPS77101DGK units undergo pre-shipment inspection (PSI). If there is an issue with TPS77101DGK, 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 TPS77101DGK part is unused and in its original packaging.
Return procedure for TPS77101DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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