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Texas Instruments TPS78342DDCT
- Part No.:
- TPS78342DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS78342DDCT.pdf
- Description:
- IC REG LINEAR 4.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:127
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Product details
Overview
TPS78342DDCT from Texas Instruments is a fixed-output 4.2-V, 150-mA ultralow-quiescent-current LDO regulator in SOT-5 (DDC) package, featuring 500 nA IQ, 130 mV dropout at 150 mA and ±3% output accuracy over load, line, and temperature - designed for battery-powered MSP430 microcontroller standby rails and low-power keep-alive circuits.
For engineers reviewing the TPS78342DDCT datasheet, TPS78342DDCT pinout, TPS78342DDCT application, or TPS78342DDCT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support details specific to the TPS78342DDCT variant.
Technical Context
The TPS78342DDCT uses a PMOS pass transistor enabling ultralow dropout and zero-load stability without pulldown circuitry - allowing its 1-μF output capacitor to serve as temporary backup power during battery replacement. Its CMOS-compatible enable pin (VEN(HI) = 1.2 V, VEN(LO) = 0.4 V) supports direct interfacing with MSP430 GPIOs.
It operates across –40°C to 105°C junction temperature, integrates thermal shutdown (trip at 160°C) and current limiting (150–400 mA), and maintains stable regulation with ceramic capacitors ≥1.0 μF (X5R/X7R recommended, ESR < 1.0 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.2 V - matches lithium-ion battery full-charge voltage for seamless integration into battery-backed keep-alive rails. |
| Quiescent Current | 500 nA typical - enables >5-year battery life in 10-sec/hour active-duty MSP430 applications using standard CR2032 cells. |
| Dropout Voltage | 130 mV at 150 mA (25°C), 175 mV at 85°C - ensures regulation down to VIN = 4.33 V at full load, preserving usable battery range. |
| Output Accuracy | ±3% over load, line, and temperature - guarantees reliable MSP430 brownout detection thresholds and analog sensor reference stability. |
| Stability | Stable with ≥1.0-μF ceramic output capacitor - eliminates need for tantalum or electrolytic caps, reducing BOM cost and board area. |
| Enable Threshold | VEN(HI) = 1.2 V, VEN(LO) = 0.4 V - compatible with 1.8-V and 3.3-V CMOS logic; supports direct connection to MSP430 SVS outputs. |
| Shutdown Current | 18 nA GND-pin current (typical) when EN ≤ 0.4 V - reduces system standby power to near-zero during battery swap or deep sleep. |
Pinout & Package
SOT-5 (DDC) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, single-row 5-pin surface-mount with exposed pad not present. Pin 1 (IN) and Pin 5 (OUT) are input/output power terminals; Pins 2 & 4 are internally connected GND; Pin 3 is CMOS-compatible EN control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input power supply terminal | Accepts 2.2–5.5 V; requires 0.1-μF local bypass cap to GND for transient immunity and noise rejection. |
| 2, 4 (GND) | Ground reference terminals | Both pins must be tied directly to PCB ground plane with low-impedance connection; critical for PSRR and thermal performance. |
| 3 (EN) | Active-high enable control | Drives regulator ON above 1.2 V (e.g., MSP430 GPIO); pulls to GND or leaves floating only if permanently enabled via IN tie. |
| 5 (OUT) | Regulated output voltage terminal | Delivers 4.2 V ±3%; connects to 1.0-μF ceramic cap to GND - no pulldown circuit enables capacitor-based backup power hold-up. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 500 nA IQ enables multi-year operation on coin cells in intermittent-sensing applications like wireless sensors. |
| No-pulldown output architecture | Enables use of OUT capacitor as temporary backup supply - supports safe hot-swap battery replacement in MSP430 systems. |
| CMOS logic-level enable | VEN(HI) = 1.2 V allows direct interface with 1.8-V I/O domains without level-shifting, simplifying low-voltage system design. |
| Thermal and overcurrent protection | Integrated shutdown at 160°C junction temp and 150–400 mA current limit prevent damage during fault conditions. |
| Wide operating temperature | –40°C to +105°C TJ rating supports deployment in industrial handhelds, automotive infotainment modules, and outdoor IoT nodes. |
Applications
| MSP430 Battery Keep-Alive Rail | Wireless Sensor Node Standby Power |
|---|---|
|
Use Scenario: Maintaining RTC, RAM, and wake-up logic in TI MSP430 microcontrollers during lithium-ion battery replacement. IC Role / Device Role / Timing Role: Provides regulated 4.2-V backup rail; output capacitor supplies energy during ~5–30 sec battery swap window. Use Value: Eliminates system reset or data loss by sustaining VCC above MSP430's 1.8-V brownout threshold using only 1-μF ceramic cap. |
Use Scenario: Powering ultra-low-duty-cycle environmental sensors (e.g., temperature/humidity) in battery-operated field nodes. IC Role / Device Role / Timing Role: Supplies clean 4.2-V rail during 100-ms measurement bursts; draws just 500 nA between readings. Use Value: Extends CR2032 battery life beyond 7 years at 1-reading-per-minute duty cycle, per TI application calculations. |
| MP3 Player Low-Power Mode Supply | Smartphone Peripheral Subsystem Rail |
|
Use Scenario: Delivering stable voltage to audio codec and flash memory during MP3 player standby mode. IC Role / Device Role / Timing Role: Regulator remains active while main SoC sleeps; powers retention logic and interrupt controllers. Use Value: Achieves <1-μA total system standby current by combining 500-nA LDO IQ with zero-load stability and no pulldown leakage. |
Use Scenario: Powering always-on sensors (accelerometer, ambient light) and NFC controllers in smartphones during display-off state. IC Role / Device Role / Timing Role: Provides isolated 4.2-V domain decoupled from main PMIC; enables independent enable/disable via AP GPIO. Use Value: Reduces subsystem leakage by 90% vs. standard LDOs, contributing to >24-hour screen-off battery endurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78342DBVR | SOT-23-5 (DBV) package; identical electrical specs, but 2.92 mm × 1.62 mm footprint and 1.45 mm height - slightly larger and taller than DDC. | Compatible with same MSP430 keep-alive designs but requires PCB layout revision due to different pad geometry and thermal pad absence. | Select DBVR only if SOT-23 assembly infrastructure is already established; DDC offers superior board-area efficiency for space-constrained wearables. |
| TPS7A0542PDBVR | 250 nA IQ, 200-mA output, 250-mV dropout at 200 mA; uses NMOS pass device requiring external bias; 1.0-μF stable. | Better IQ and current capability, but requires separate bias rail and lacks true zero-load stability - unsuitable for capacitor-backup use cases. | Choose PDBVR for new designs prioritizing lowest possible IQ where backup-capacitor functionality is unnecessary and bias supply exists. |
Compared with TPS78342DBVR, the TPS78342DDCT saves 0.15 mm in height and 0.02 mm in length/width - critical for thin-profile wearables; versus TPS7A0542PDBVR, it trades 250 nA lower IQ for proven capacitor-backup operation and simpler single-rail design.
Availability
TPS78342DDCT is available at Aetrix Electronics and suitable for battery-powered handheld products, wireless sensor nodes, and MSP430-based embedded systems requiring stable component supply with long-lifecycle assurance.
Supply support for TPS78342DDCT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS783 family was engineered specifically for ultralow-power battery applications - targeting microcontroller standby rails, sensor keep-alive circuits, and energy-harvesting systems where nanoscale quiescent current and capacitor-based backup capability are mandatory.
FAQ
What is the exact output voltage tolerance of the TPS78342DDCT over temperature and load?
The TPS78342DDCT guarantees ±3% DC output accuracy across –40°C to +105°C junction temperature, full 0–150 mA load range, and 2.2–5.5 V input voltage. This includes combined effects of line regulation (±1.0%), load regulation (±1.0%), and initial setpoint error - verified per TI SBVS133A datasheet Section 6.5.
Can the TPS78342DDCT operate without an output capacitor?
No - the TPS78342DDCT requires a minimum 1.0-μF ceramic output capacitor (X5R/X7R, ESR < 1.0 Ω) for stability. It is not stable with zero load capacitance. However, it remains well-regulated down to 0 mA output current, unlike many PMOS LDOs that degrade at light loads.
Does the TPS78342DDCT support capacitor-based backup power during battery replacement?
Yes - the TPS78342DDCT has no internal pulldown circuit at the OUT pin, enabling its output capacitor to supply temporary power to downstream circuitry (e.g., MSP430 RAM/RTC) when input is removed. Equation 1 in TI's SBVS133A datasheet quantifies hold-up time based on COUT, leakage, and load current.
What is the maximum allowable input voltage for the TPS78342DDCT?
The absolute maximum input voltage for the TPS78342DDCT is 6.0 V, but recommended operating VIN is 2.2 V to 5.5 V. Exceeding 5.5 V risks permanent damage; operation above 5.5 V violates Recommended Operating Conditions and voids reliability guarantees per Section 6.3 of the datasheet.
How does the enable pin of the TPS78342DDCT interface with MSP430 GPIOs?
The TPS78342DDCT EN pin is CMOS-compatible with VEN(HI) = 1.2 V (min) and VEN(LO) = 0.4 V (max), matching MSP430 I/O voltage thresholds directly. No level shifter is needed - connect EN to any MSP430 GPIO configured as push-pull output; tie to IN for permanent enable.
TPS78342DDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 800 nA
- Current - Supply (Max):
- 8 µA
- PSRR:
- 40dB ~ 15dB (10Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS78342DDCT FAQ
1.How can I place an order for TPS78342DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS78342DDCT 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 TPS78342DDCT reliable?
The price and inventory of TPS78342DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS78342DDCT is usually 5 days.
3.What payment methods are accepted for TPS78342DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS78342DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS78342DDCT?
TPS78342DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS78342DDCT 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 TPS78342DDCT?
For technical support, including TPS78342DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS78342DDCT requirements.
6.How does Aetrix verify that TPS78342DDCT is sourced from the original manufacturer or authorized distributors?
All TPS78342DDCT 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 TPS78342DDCT meets industry standards.
7.What is the process for return or replacement of TPS78342DDCT?
All TPS78342DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS78342DDCT, 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 TPS78342DDCT part is unused and in its original packaging.
Return procedure for TPS78342DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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