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Texas Instruments REG71050DDCR
- Part No.:
- REG71050DDCR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
REG71050DDCR.pdf
- Description:
- IC REG CHARGE PUMP 5V 60MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,079
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Product details
Overview
REG71050DDCR from Texas Instruments is a fixed 5.0 V, 60-mA buck-boost switched-capacitor DC-DC converter in a 6-pin SOT-23-THIN (DDC) package. It operates across 1.8 V–5.5 V input, delivers low-ripple regulated output without inductors, and supports automatic step-up/step-down mode switching - ideal for powering SIM cards and smart card readers from single-cell Li-ion or alkaline sources.
For engineers reviewing the REG71050DDCR datasheet, REG71050DDCR pinout, REG71050DDCR application, or REG71050DDCR equivalent, key selection criteria include its 5.0 V fixed output, 60 mA max load capability, 1 MHz internal oscillator enabling 0.22 µF pump capacitor use, shutdown current <1 µA, and thermal/current protection - all critical for space-constrained battery-powered designs.
Technical Context
The REG71050DDCR implements a variable-frequency charge-pump topology with automatic mode selection: it operates in step-down (buck) mode when VIN > 5.0 V and step-up (boost) mode when VIN < 5.0 V, maintaining regulation without external inductors. Internal FETs (Q1–Q4) are reconfigured per half-cycle of the 1 MHz oscillator to charge and transfer energy via CPUMP.
It features hardware enable control (active-high EN pin), thermal shutdown at 160°C with 140°C hysteresis, and cycle-skipping regulation to maintain output voltage under varying load and input conditions. Input current ripple is minimized via peak-current reduction circuitry, and output ripple remains ≤35 mVPP at 30 mA with 2.2 µF ceramic COUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V (±6% over –40°C to +85°C, 3.3 V ≤ VIN ≤ 5.5 V, 30 mA load) |
| Max Output Current | 60 mA (guaranteed at VIN ≥ 3.3 V; derates below 3.3 V) |
| Input Voltage Range | 1.8 V to 5.5 V (supports single-cell Li-ion, 2–3 cell alkaline/Ni-based batteries) |
| Quiescent Current | 65 µA typical (no load, 25°C); enables ultra-low-power standby operation |
| Shutdown Current | 0.01 µA typical (EN = low; reduces system power loss in sleep modes) |
| Switching Frequency | 1 MHz (enables use of small 0.22 µF ceramic CPUMP and 2.2 µF CIN/COUT) |
| Output Ripple | ≤35 mVPP (at 30 mA, 25°C, 2.2 µF COUT, ESR < 0.1 Ω) |
| Efficiency | Up to 90% (at VIN = 3.6 V, IOUT = 10 mA; drops to ~50% at VIN = 1.8 V, 30 mA) |
Pinout & Package
REG71050DDCR uses the SOT-23-THIN (DDC) 6-pin package (2.90 mm × 1.60 mm body, 0.95 mm height), with exposed thermal pad for enhanced thermal performance. Pin 1 is VOUT; pin 2 is GND; pin 3 is Enable; pin 4 is Cpump−; pin 5 is VIN; pin 6 is Cpump+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output supply | Delivers fixed 5.0 V to load; requires 2.2 µF ceramic capacitor to GND for stability and ripple suppression |
| GND (Pin 2) | Power ground reference | Common return path for input, output, and pump circuits; must be low-impedance and connected to thermal pad |
| Enable (Pin 3) | Hardware enable/disable control | Active-high logic input; drives device into shutdown (<1 µA IQ) when pulled low; must not float |
| Cpump− (Pin 4) | Flying capacitor negative terminal | Connects to one side of 0.22 µF ceramic flying capacitor (CPUMP); forms charge-transfer node in boost/buck cycles |
| VIN (Pin 5) | Unregulated input supply | Accepts 1.8–5.5 V; requires 2.2 µF ceramic decoupling capacitor close to pin to handle high-frequency peak currents |
| Cpump+ (Pin 6) | Flying capacitor positive terminal | Connects to other side of 0.22 µF flying capacitor; alternately charged/discharged to generate boosted output voltage |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI concerns; reduces BOM count and PCB area vs. inductor-based DC-DC converters |
| Automatic buck/boost mode switching | Maintains 5.0 V regulation whether input is above or below 5.0 V - no external mode control required |
| Low input current ripple | Peak input current limited internally; minimizes stress on battery and input capacitors, easing layout and filtering |
| Thermal and current limit protection | Shuts down at 160°C junction temperature and limits short-circuit current to ~100 mA - protects IC and load during faults |
| Ultra-low shutdown current | 0.01 µA typical enables multi-year battery life in always-on, intermittently active applications like smart cards |
| 1-MHz oscillator with small capacitors | Enables use of 0.22 µF flying cap and 2.2 µF input/output caps - supports miniaturized designs using 0402/0603 ceramics |
Applications
| Smart Card Readers | SIM Card Power Supply |
|---|---|
|
Use Scenario: Powering ISO 7816-compliant smart card interfaces in point-of-sale terminals and secure authentication devices. IC Role / Device Role / Timing Role: Provides stable 5.0 V rail from variable 2.7–5.5 V host supply, meeting card voltage tolerance and transient response requirements. Use Value: Enables direct connection to battery or USB VBUS without LDO pre-regulation; maintains regulation during card insertion/removal transients. |
Use Scenario: Supplying 5.0 V to 3G/4G LTE SIM modules in mobile handsets and IoT trackers operating from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Acts as primary SIM power source with fast enable/disable control synchronized to modem power sequencing. Use Value: Delivers full 60 mA during SIM initialization bursts while consuming only 65 µA quiescent current during idle - extends battery runtime. |
| Handheld Medical Devices | LCD Display Bias Supply |
|
Use Scenario: Powering microcontroller peripherals and sensor interfaces in portable glucose meters and pulse oximeters powered by coin cells or AAA alkalines. IC Role / Device Role / Timing Role: Generates clean 5.0 V from 1.8–3.6 V battery sources, supporting precise analog front-end operation. Use Value: Maintains regulation down to 1.8 V input - extends usable battery life beyond LDO cutoff; low ripple avoids noise coupling into sensitive measurements. |
Use Scenario: Providing 5.0 V bias for segment LCD drivers in industrial HMIs and consumer electronics where display contrast depends on stable VDD. IC Role / Device Role / Timing Role: Supplies low-noise, low-ripple 5.0 V rail independent of main system supply fluctuations. Use Value: 35 mVPP ripple ensures consistent LCD contrast; 1 MHz switching avoids audible noise and simplifies EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REG71055DDCR | Fixed 5.5 V output; minimum startup VIN = 3.0 V (vs. 1.8 V for REG71050DDCR) | Used where higher output voltage is needed for legacy 5.5 V logic or specific sensor biasing | Select REG71055DDCR only if 5.5 V output is mandatory; otherwise REG71050DDCR offers wider input range and better compatibility with 5.0 V systems. |
| TPS60403DBVR | Fixed 5.0 V output, 60 mA; requires external 1 µF flying cap; 1.6 V–5.5 V input; 1.2 MHz switching | Offers lower quiescent current (50 µA) but lacks thermal shutdown and has tighter input voltage min (1.6 V vs. 1.8 V) | Choose TPS60403DBVR for ultra-low-IQ designs where thermal protection is handled externally; REG71050DDCR provides integrated safety features and broader VIN tolerance. |
Compared with REG71055DDCR and TPS60403DBVR, REG71050DDCR uniquely combines 1.8 V startup, integrated thermal/current protection, and 5.0 V output in a compact DDC package - making it optimal for cost-sensitive, safety-aware battery-powered applications requiring robustness and design simplicity.
Availability
REG71050DDCR is available at Aetrix Electronics and suitable for smart card readers, SIM card power supplies, and handheld medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for REG71050DDCR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The REG710 family was designed specifically for low-power, inductorless voltage conversion in space-constrained portable systems - targeting applications where battery voltage varies above and below the required regulated rail.
FAQ
What is the minimum input voltage required for REG71050DDCR to start up and regulate?
The REG71050DDCR has a tested startup input voltage of 1.8 V, enabling operation directly from depleted single-cell alkaline or NiMH batteries. Regulation is maintained across the full 1.8 V–5.5 V range, with output accuracy specified at ±6% for loads up to 30 mA and VIN ≥ 3.3 V. Below 3.3 V, output current capability decreases gradually per the efficiency curves in the datasheet.
Can REG71050DDCR drive multiple white LEDs in series?
REG71050DDCR is not designed for direct white LED driving due to its fixed 5.0 V output and lack of current regulation. However, it can power LED driver ICs (e.g., constant-current boost controllers) or parallel LED strings with appropriate current-limiting resistors. For 3.3 V white LEDs, use REG71033DDCR instead; for higher forward voltages, cascade two REG710 devices as shown in Figure 21 of the SBAS221H datasheet.
What external capacitors are required for stable operation of REG71050DDCR?
REG71050DDCR requires three external ceramic capacitors: 2.2 µF input (CIN), 2.2 µF output (COUT), and 0.22 µF flying capacitor (CPUMP). All must be X7R or X5R dielectric, surface-mount types (e.g., 0603 or 0805). Lower values (e.g., 1 µF CIN/COUT, 0.1 µF CPUMP) may work at light loads or higher VIN, but increase ripple and reduce transient performance.
Does REG71050DDCR support output voltage adjustment via feedback resistors?
No, REG71050DDCR provides a factory-trimmed fixed 5.0 V output and does not include an external feedback pin. Output voltage is set internally and cannot be adjusted. For adjustable-output charge pumps, consider TI's TPS60400 series or discrete controller + external FET solutions - but these require additional components and layout complexity.
How does thermal shutdown behave in REG71050DDCR during sustained overload?
When junction temperature reaches ~160°C, REG71050DDCR disables switching and forces VOUT to drop. Recovery occurs automatically once junction temperature falls to ~140°C. During repeated thermal cycling, average output current is limited by ambient conditions and PCB thermal design - continuous operation in shutdown degrades reliability. Use proper copper pour and thermal vias under the exposed pad to sustain 60 mA at elevated ambient temperatures.
REG71050DDCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 60mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
REG71050DDCR FAQ
1.How can I place an order for REG71050DDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for REG71050DDCR 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 REG71050DDCR reliable?
The price and inventory of REG71050DDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REG71050DDCR is usually 5 days.
3.What payment methods are accepted for REG71050DDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REG71050DDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REG71050DDCR?
REG71050DDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REG71050DDCR 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 REG71050DDCR?
For technical support, including REG71050DDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REG71050DDCR requirements.
6.How does Aetrix verify that REG71050DDCR is sourced from the original manufacturer or authorized distributors?
All REG71050DDCR 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 REG71050DDCR meets industry standards.
7.What is the process for return or replacement of REG71050DDCR?
All REG71050DDCR units undergo pre-shipment inspection (PSI). If there is an issue with REG71050DDCR, 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 REG71050DDCR part is unused and in its original packaging.
Return procedure for REG71050DDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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