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Texas Instruments REG71050DDCT
- Part No.:
- REG71050DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
REG71050DDCT.pdf
- Description:
- IC REG CHARGE PUMP 5V 60MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,610
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Product details
Overview
REG71050DDCT from Texas Instruments is a buck-boost switched-capacitor DC-DC converter delivering a fixed 5.0 V output from 1.8 V to 5.5 V input, supporting up to 30 mA continuous load current with 90% peak efficiency, <35 mVPP output ripple, and integrated thermal/current protection-used in SIM card power rails and low-power handheld device subsystems.
For engineers reviewing the REG71050DDCT datasheet, REG71050DDCT pinout, REG71050DDCT application, or REG71050DDCT equivalent, key selection criteria include input voltage range compatibility (1.8–5.5 V), fixed 5.0 V output regulation under buck/boost mode switching, shutdown quiescent current (<1 μA), thermal shutdown threshold (160°C), and SOT-23-THIN (DDC) package constraints.
Technical Context
The REG71050DDCT operates as an automatic mode-switching charge pump: it functions in step-down (buck) mode when VIN > VOUT and step-up (boost) mode when VIN < VOUT, with no inductor required. Its 1-MHz internal oscillator enables use of small 0.22 μF flying and 2.2 μF input/output ceramic capacitors.
Internal FET control logic manages Cpump+ and Cpump− terminals to alternate charge/discharge phases, while EN pin logic (1.3 V high threshold) enables full shutdown with 0.01 μA typical current draw. Thermal protection disables output at ~160°C junction temperature and recovers at ~140°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3% over 1.8–5.5 V input and –40°C to +85°C ambient - ensures stable rail for 5 V logic or analog circuitry without external feedback. |
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V), 2–3 cell alkaline/nickel chemistries, and partially discharged batteries. |
| Max Output Current | 30 mA continuous - sufficient for SIM cards, smart card readers, and low-power LCD bias supplies. |
| Peak Efficiency | 90% at 10 mA load and VIN = VOUT - minimizes heat generation and extends battery life in portable applications. |
| Output Ripple | <35 mVPP at 30 mA - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Quiescent Current | 65 μA typical - enables always-on subsystems with minimal standby drain. |
| Shutdown Current | 0.01 μA typical - reduces system-level leakage during deep sleep modes. |
Pinout & Package
SOT-23-THIN (DDC) package, 2.90 mm × 1.60 mm body size, 0.95 mm height, exposed pad not electrically connected - optimized for space-constrained PCB layouts with standard reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 1.8–5.5 V unregulated source; requires local 2.2 μF ceramic decoupling capacitor. |
| VOUT | Regulated output | Delivers fixed 5.0 V; connects to 2.2 μF ceramic output capacitor and load. |
| GND | Ground reference | Common return path for input, output, and pump circuits; must be low-impedance. |
| Enable | Hardware enable/disable | Active-high logic input (1.3 V min); pulls low to enter sub-1 μA shutdown state. |
| Cpump+ | Flying capacitor terminal (+) | Connects to one side of 0.22 μF flying capacitor; alternates between VIN and VOUT during switching cycles. |
| Cpump− | Flying capacitor terminal (−) | Connects to other side of 0.22 μF flying capacitor; referenced to GND during charge phase. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost operation | Seamlessly transitions between step-up and step-down modes without external control - eliminates need for manual mode selection or dual-rail design. |
| No inductor required | Uses only three external ceramic capacitors (CIN, COUT, CPUMP) - reduces EMI, board area, and BOM cost versus inductive DC-DC solutions. |
| Low input current ripple | Peak input current limited by internal circuitry - eases input capacitor sizing and improves battery lifetime in pulsed-load applications. |
| Thermal and current limit protection | Shuts down at ~160°C junction temperature and limits short-circuit current to ~100 mA - prevents damage during fault conditions. |
| 1-MHz internal oscillator | Enables use of 0.22 μF flying capacitor and 2.2 μF bulk capacitors - supports compact 0402/0603 footprint placement. |
Applications
| Smart Card Readers | SIM Card Power Supply |
|---|---|
|
Use Scenario: Powering ISO/IEC 7816-compliant smart cards in point-of-sale terminals or secure authentication devices. IC Role / Device Role / Timing Role: Provides regulated 5.0 V supply directly from variable battery or USB input, maintaining compliance during card insertion/removal transients. Use Value: Eliminates need for separate LDO or inductor-based regulator, reducing solution size and enabling direct integration into compact reader modules. |
Use Scenario: Delivering stable 5.0 V to GSM/UMTS/LTE SIM cards operating across wide input voltage ranges (e.g., 2.7–4.2 V Li-ion). IC Role / Device Role / Timing Role: Acts as primary SIM interface power rail generator with automatic buck/boost behavior - maintains regulation even during battery sag or partial discharge. Use Value: Ensures reliable SIM communication and reset sequencing without brownout-induced protocol errors or card lockups. |
| Handheld Device Subsystems | LCD Display Bias Supply |
|
Use Scenario: Powering low-current peripherals such as IR transceivers, real-time clocks, or sensor interfaces in medical or industrial handheld units. IC Role / Device Role / Timing Role: Supplies clean 5.0 V rail with <35 mVPP ripple and 65 μA quiescent current - supports always-on functionality with minimal battery drain. Use Value: Extends operational time between charges while meeting stringent EMC requirements due to inductorless architecture. |
Use Scenario: Generating 5.0 V bias voltage for segment or character LCD modules requiring stable, low-noise supply. IC Role / Device Role / Timing Role: Replaces discrete charge-pump ICs or inefficient linear regulators - delivers precise 5.0 V with tight tolerance and fast transient response. Use Value: Prevents display flicker or contrast shift during dynamic content updates by maintaining voltage stability under varying load currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60403DBVR | Fixed 5.0 V output, 60 mA max, 1.8–5.5 V input, but uses different flying capacitor topology and lacks thermal shutdown. | Higher output current capability, but less robust fault protection - suitable where load demands exceed 30 mA and thermal margin is controlled externally. | Select TPS60403DBVR only if sustained >30 mA load is required and board-level thermal management is implemented. |
| MAX680ESA+ | Fixed ±5 V dual-output, 20 mA per rail, 4.5–6.5 V input - not compatible with sub-4.5 V inputs or single-rail 5 V use. | Designed for dual-rail op-amp biasing, not single-rail digital logic - incompatible with SIM/smart card 5 V rail requirements. | Choose MAX680ESA+ only for bipolar analog supply needs; avoid for REG71050DDCT's 1.8–5.5 V single-rail applications. |
Compared with TPS60403DBVR and MAX680ESA+, the REG71050DDCT offers superior thermal safety, tighter output voltage tolerance (±3% vs ±5%), and guaranteed operation down to 1.8 V - making it the preferred choice for battery-powered, safety-critical 5 V rail generation.
Availability
REG71050DDCT is available at Aetrix Electronics and suitable for SIM card power supplies, smart card readers, and handheld device subsystems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for REG71050DDCT 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The REG710 family was designed specifically for low-noise, inductorless voltage conversion in space-constrained, battery-powered systems - targeting SIM, smart card, and LCD bias applications where reliability and minimal external components are critical.
FAQ
What is the input voltage range supported by the REG71050DDCT?
The REG71050DDCT supports an input voltage range of 1.8 V to 5.5 V. This allows operation from partially discharged single-cell Li-ion batteries (down to 2.7 V), multi-cell alkaline sources, and USB-supplied systems. The device automatically switches between buck and boost modes to maintain 5.0 V regulation across this full range, as confirmed in the Electrical Characteristics table and Figure 1 of the SBAS221H datasheet.
Does the REG71050DDCT require an inductor in its application circuit?
No, the REG71050DDCT does not require an inductor. It is a switched-capacitor (charge pump) DC-DC converter that uses only three external ceramic capacitors: 2.2 μF input (CIN), 2.2 μF output (COUT), and 0.22 μF flying capacitor (CPUMP). This inductorless architecture reduces EMI, saves board space, and lowers BOM cost - a core feature explicitly stated in the "Features" section of the REG71050DDCT datasheet.
What is the maximum continuous output current rating for the REG71050DDCT?
The REG71050DDCT is rated for 30 mA continuous output current under recommended operating conditions (TA = –40°C to +85°C, VIN ≥ 3.3 V). At higher loads (e.g., 60 mA), operation is limited to narrower input voltage ranges (3.3 V ≤ VIN ≤ 4.2 V) and may trigger thermal shutdown. This value is specified in Section 7.5 "Electrical Characteristics" under the Iout parameter.
How does the Enable pin function on the REG71050DDCT?
The Enable pin on the REG71050DDCT is an active-high digital control input. Pulling it high (≥1.3 V) enables normal operation; pulling it low (<0.4 V) places the device in shutdown mode, reducing quiescent current to 0.01 μA typical. The pin must not be left floating and requires explicit termination - details are provided in Section 7.5 (Control Signals) and Section 8.3.1 of the SBAS221H datasheet.
What package type is used for the REG71050DDCT, and what are its key mechanical dimensions?
The REG71050DDCT uses the SOT-23-THIN (DDC) package: 6-pin, 2.90 mm × 1.60 mm body size, 0.95 mm maximum height, with gull-wing leads and RoHS-compliant NiPdAu lead finish. It carries MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH. These specifications are documented in the "Mechanical, Packaging, and Orderable Information" section and Package Option Addendum of the official TI datasheet.
REG71050DDCT 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
REG71050DDCT FAQ
1.How can I place an order for REG71050DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for REG71050DDCT 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 REG71050DDCT reliable?
The price and inventory of REG71050DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REG71050DDCT is usually 5 days.
3.What payment methods are accepted for REG71050DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REG71050DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REG71050DDCT?
REG71050DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REG71050DDCT 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 REG71050DDCT?
For technical support, including REG71050DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REG71050DDCT requirements.
6.How does Aetrix verify that REG71050DDCT is sourced from the original manufacturer or authorized distributors?
All REG71050DDCT 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 REG71050DDCT meets industry standards.
7.What is the process for return or replacement of REG71050DDCT?
All REG71050DDCT units undergo pre-shipment inspection (PSI). If there is an issue with REG71050DDCT, 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 REG71050DDCT part is unused and in its original packaging.
Return procedure for REG71050DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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