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NXP Semiconductors LD6815TD/21H,125
- Part No.:
- LD6815TD/21H,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/21H,125.pdf
- Description:
- IC REG LINEAR 2.1V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:80,922
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Product details
Overview
LD6815TD/21H from NXP Semiconductors is a fixed-output 2.1 V, 150 mA low-dropout linear regulator with ultra-high PSRR (75 dB at 1 kHz), 250 mV dropout at full load, and high-ohmic (3-state) output during disable. It operates from 2.3 V to 5.5 V input and delivers ultra-low noise (40 µV RMS, 10 Hz–100 kHz) for powering sensitive analog or RF circuitry in portable consumer devices.
For engineers reviewing the LD6815TD/21H datasheet, LD6815TD/21H pinout, LD6815TD/21H application, or LD6815TD/21H equivalent, key selection criteria include its 2.1 V fixed output, TSOP5 (SOT753) package footprint, enable-controlled 3-state shutdown, 0.1 µA quiescent current in disable mode, and verified PSRR performance across 1 kHz–100 kHz.
Technical Context
The LD6815TD/21H implements a PMOS pass transistor architecture enabling low dropout and high PSRR without requiring external compensation. Its internal bandgap reference and error amplifier maintain ±2% output voltage accuracy over −40 °C to +85 °C ambient and full load range.
Enable logic is CMOS-compatible (VIH = 1.1 V, VIL = 0.4 V), and the device enters true 3-state disable mode-no pull-down-ensuring isolation of downstream circuitry. Startup time is tightly specified at 150 µs with 1 µF output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.1 V ±2% - ensures stable biasing for 2.1 V I/O domains or core rails in mobile SoCs. |
| Max Output Current | 150 mA continuous - supports moderate-power peripherals like camera modules or audio codecs. |
| Dropout Voltage | 250 mV at 150 mA - enables operation down to VIN = 2.35 V while maintaining regulation. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO. |
| RMS Output Noise | 40 µV (10 Hz–100 kHz) - minimizes jitter and SNR degradation in ADCs, PLLs, and RF receivers. |
| Quiescent Current (Disable) | 0.1 µA - extends battery life in always-on standby modes of smartphones and wearables. |
| Startup Time | 150 µs - meets fast wake-up timing requirements for power-gated subsystems. |
Pinout & Package
SOT753 (TSOP5) plastic surface-mount package: 2.9 × 1.5 × 1.0 mm, 5-lead, lead pitch 0.95 mm, JEDEC SC-74A compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input | Accepts 2.3–5.5 V supply; requires ≥0.7 µF input capacitor for stability. |
| 2 - GND | Power ground | Common return path for input, output, and enable; must connect to low-impedance ground plane. |
| 3 - EN | Enable control | Active-HIGH logic; drives internal pass transistor when ≥1.1 V applied; <0.4 V disables regulator. |
| 4 - n.c. | No connection | Internally unconnected; must remain floating-no PCB trace or solder mask opening required. |
| 5 - OUT | Regulated output | Delivers 2.1 V at up to 150 mA; requires 0.7–1.0 µF X7R ceramic capacitor with ESR 5–500 mΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high PSRR | 75 dB @ 1 kHz enables clean power delivery in noisy multi-rail mobile platforms. |
| 3-state output disable | High-ohmic (not pulled) output isolates downstream loads during shutdown-critical for rail sequencing. |
| Low-noise regulation | 40 µV RMS noise (10 Hz–100 kHz) preserves signal integrity in precision analog and RF front-ends. |
| ESD robustness | 6 kV HBM rating ensures reliability during board assembly and end-user handling. |
| Thermal performance | 125 K/W junction-to-ambient thermal resistance allows 150 mA operation at +85 °C ambient with minimal heatsinking. |
Applications
| Smartphone Power Management | Tablet PC Audio Subsystem |
|---|---|
Use Scenario: Supplying 2.1 V bias to image sensor interface or baseband I/O buffers during active capture mode. IC Role / Device Role / Timing Role: Low-noise, fast-starting LDO providing isolated, regulated rail decoupled from noisy main PMIC outputs. Use Value: Prevents switching noise coupling into sensor analog chain, reducing image fixed-pattern noise by >10 dB. |
Use Scenario: Powering DAC and headphone amplifier in tablet audio codec section. IC Role / Device Role / Timing Role: Dedicated low-noise LDO delivering stable 2.1 V to analog audio circuitry with <150 µs wake-up latency. Use Value: Maintains THD+N <−95 dB under dynamic load, eliminating audible pop/click during playback start. |
| Digital Still Camera Core Logic | Portable Media Player RF Front-End |
Use Scenario: Regulating 2.1 V for FPGA configuration memory and low-power microcontroller in compact DSC modules. IC Role / Device Role / Timing Role: Enable-controlled LDO supporting rapid power cycling of imaging subsystems between shots. Use Value: 0.1 µA shutdown current extends standby battery life to >72 hours; 250 mV dropout enables use with aging Li-ion cells. |
Use Scenario: Providing clean 2.1 V supply to GPS/GNSS receiver LNA and mixer stages in handheld media players. IC Role / Device Role / Timing Role: High-PSRR LDO rejecting noise from display backlight drivers and USB data lines. Use Value: Improves GNSS sensitivity by 2 dB through 75 dB ripple suppression at 1–10 kHz switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0521PDBVR | 2.1 V fixed, 200 mA, 170 mV dropout, 55 dB PSRR @ 1 kHz, SOT-23-5 package | Lower PSRR and higher dropout; smaller footprint but higher thermal resistance (210 K/W) | Choose for space-constrained designs where PSRR >70 dB is not required and thermal margin is sufficient. |
| MCP1700T-2102E/TT | 2.1 V fixed, 250 mA, 600 mV dropout, 45 dB PSRR @ 1 kHz, SOT-23-3 package (no enable) | No enable pin; higher dropout limits usable input range; lower PSRR increases noise susceptibility | Use only in non-sequenced, always-on applications where ultra-low IQ (1.6 µA) outweighs PSRR and enable needs. |
Compared with TPS7A0521PDBVR and MCP1700T-2102E/TT, the LD6815TD/21H uniquely combines 2.1 V output, 75 dB PSRR, 3-state enable, and SOT753 compatibility-making it optimal for noise-sensitive, sequenced power domains in premium mobile devices.
Availability
LD6815TD/21H is available at Aetrix Electronics and suitable for smartphone power management, tablet PC audio subsystems, digital still camera core logic, portable media player RF front-ends, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for LD6815TD/21H 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.
The LD6815 series was designed specifically for ultra-low-noise, high-PSRR power regulation in battery-powered portable electronics-emphasizing small size, fast transient response, and robust enable-controlled sequencing.
FAQ
What is the output voltage tolerance of the LD6815TD/21H over temperature and load?
The LD6815TD/21H maintains output voltage within ±2% over −40 °C to +85 °C ambient temperature and 1 mA to 150 mA load current. At +25 °C and 1 mA load, tolerance tightens to ±0.5%. This accuracy ensures reliable operation of 2.1 V I/O interfaces without external trimming or feedback adjustment. The LD6815TD/21H achieves this via a precision bandgap reference and low-drift error amplifier integrated into its monolithic silicon design.
Does the LD6815TD/21H require an external output capacitor, and what are the specifications?
Yes, the LD6815TD/21H requires an external output capacitor of 0.7–1.0 µF with ESR between 5 mΩ and 500 mΩ. X7R ceramic capacitors are recommended to meet full temperature range (−40 °C to +125 °C). The capacitor stabilizes regulation, reduces output impedance, and controls startup/shutdown transients. Using less than 0.7 µF risks instability and overshoot; exceeding 1.0 µF increases startup time beyond the specified 150 µs. The LD6815TD/21H's internal compensation is optimized for this exact range.
How does the enable pin (EN) function on the LD6815TD/21H, and what are its voltage thresholds?
The LD6815TD/21H EN pin is active-HIGH with VIH ≥1.1 V (minimum) and VIL ≤0.4 V (maximum). When EN ≥1.1 V, the regulator powers up with 150 µs startup time; when EN ≤0.4 V, it enters 3-state disable mode with 0.1 µA quiescent current and high-ohmic output. The pin accepts voltages up to VIN, allowing direct interfacing with 1.8 V or 3.3 V GPIOs. This behavior is confirmed in Table 8 and Section 2.2 of the LD6815TD/21H datasheet.
What is the thermal resistance (Rth(j-a)) of the LD6815TD/21H, and how does it affect maximum load at +85 °C ambient?
The LD6815TD/21H has a typical junction-to-ambient thermal resistance of 125 K/W under standard two-layer PCB conditions. At +85 °C ambient and 150 mA load, power dissipation is ~37.5 mW (Vdo × IOUT = 0.25 V × 0.15 A), resulting in a junction temperature rise of ~4.7 °C-well below the +125 °C absolute maximum. This confirms the LD6815TD/21H can safely deliver full rated current at max ambient without derating, provided minimum copper area guidelines per Figure 16 are followed.
Is the LD6815TD/21H pin-compatible with other variants in the LD6815 series, such as LD6815TD/21P?
No-the LD6815TD/21H and LD6815TD/21P share identical pinout and package (SOT753), but differ electrically in disable-mode behavior: the /21H provides high-ohmic (3-state) output, while the /21P integrates a 100 Ω pull-down transistor for auto-discharge. Both are mechanically interchangeable, but substituting one for the other requires verifying system-level sequencing and discharge requirements. This distinction is explicitly defined in Sections 1.1 and 4 of the LD6815TD/21H product documentation.
LD6815TD/21H,125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 35 µA
- Current - Supply (Max):
- 150 µA
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Transient Voltage
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
LD6815TD/21H,125 FAQ
1.How can I place an order for LD6815TD/21H,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/21H,125 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 LD6815TD/21H,125 reliable?
The price and inventory of LD6815TD/21H,125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6815TD/21H,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/21H,125?
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4.How is shipping managed for LD6815TD/21H,125?
LD6815TD/21H,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/21H,125 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 LD6815TD/21H,125?
For technical support, including LD6815TD/21H,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/21H,125 requirements.
6.How does Aetrix verify that LD6815TD/21H,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/21H,125 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 LD6815TD/21H,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/21H,125?
All LD6815TD/21H,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/21H,125, 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 LD6815TD/21H,125 part is unused and in its original packaging.
Return procedure for LD6815TD/21H,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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