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Texas Instruments LP3996SD-1525
- Part No.:
- LP3996SD-1525
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LP3996SD-1525.pdf
- Description:
- IC REG LINEAR 1.5V/2.5V 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
LP3996SD-1525 from Texas Instruments is a dual low-dropout linear regulator IC with independent 150 mA and 300 mA outputs, fixed 1.5 V / 2.5 V output pair, power-on-reset (POR) function tied to LDO2, ultra-low 35 µA quiescent current in enabled state, and stable operation with 1 µF ceramic output capacitors - used in portable wireless network adaptors for clean, sequenced power delivery to RF and baseband subsystems.
For engineers reviewing the LP3996SD-1525 datasheet, LP3996SD-1525 pinout, LP3996SD-1525 application, or LP3996SD-1525 equivalent, this page delivers verified functional identity, confirmed WSON-10 package mapping, validated POR delay adjustability via SET pin, exact LDO1/LDO2 current and voltage ratings, and real-world selection guidance against comparable dual-LDO regulators.
Technical Context
The LP3996SD-1525 integrates two independent LDOs on a single die: LDO1 delivers 150 mA at 1.5 V with 220 mV dropout at full load; LDO2 delivers 300 mA at 2.5 V with 550 mV dropout and embeds a POR circuit monitoring its own output. The SET pin sources 1.3 µA to charge an external capacitor, enabling programmable POR delay up to hundreds of milliseconds.
Its CBYP pin accepts a 10 nF bypass capacitor to reduce reference noise and improve PSRR (70 dB at 1 kHz for LDO2); EN1/EN2 are active-high enables with 0.95 V VIH threshold and <10 nA shutdown current. Thermal shutdown activates at 160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | Fixed 1.5 V (LDO1) and 2.5 V (LDO2), ±3.75% tolerance over –40°C to +125°C junction range |
| Max Output Current | 150 mA on VOUT1, 300 mA on VOUT2 - defines maximum supported load per rail without dropout or thermal shutdown |
| Dropout Voltage | 220 mV at 150 mA (LDO1), 550 mV at 300 mA (LDO2) - sets minimum VIN–VOUT headroom required for regulation |
| Quiescent Current | 35 µA (both LDOs enabled, no load), <10 nA (both disabled) - enables multi-week battery life in always-on portable systems |
| POR Threshold | Active-low open-drain flag triggers below 88% of 2.5 V (2.2 V), releases above 96% (2.4 V) - provides reliable reset assertion during brownout |
| SET Pin Function | 1.3 µA current source charging external capacitor to 1.25 V threshold - enables precise POR delay tuning (e.g., 0.1 µF = ~100 ms) |
| Package | WSON-10 (3 mm × 3 mm, DSC0010A), exposed thermal pad connected to GND - supports high-power-density PCB layouts |
Pinout & Package
LP3996SD-1525 is housed in a 10-pin WSON (Wettable Flank Small Outline No-Lead) package with 3 mm × 3 mm footprint and exposed thermal pad (Pin 6 and Pad both GND). The package is RoHS-compliant, lead-free, and moisture-sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply rail | Accepts 2.0 V–6.0 V; requires 1 µF ceramic capacitor to GND within 1 cm for stability |
| EN1 (Pin 2) | LDO1 enable control | Active-high input; >0.95 V enables 150 mA LDO delivering 1.5 V; <0.4 V disables with <10 nA IQ |
| EN2 (Pin 3) | LDO2 enable control | Active-high input; >0.95 V enables 300 mA LDO delivering 2.5 V and activates POR monitoring |
| CBYP (Pin 4) | Reference bypass node | Connect 10 nF NPO/COG capacitor to GND to reduce output noise and improve PSRR by up to 12 dB |
| SET (Pin 5) | POR delay timing input | 1.3 µA current source charges external capacitor; delay = (1.25 V × CSET) / 1.3 µA |
| GND (Pin 6) | Power and signal ground | Primary ground connection; must be bonded to exposed thermal pad for thermal performance |
| N/C (Pin 7) | No connection | Internally unconnected; must remain floating - no PCB trace or component allowed |
| POR (Pin 8) | Open-drain power-good flag | Active-low output indicating LDO2 undervoltage; requires external pull-up to VOUT2 or VIN |
| VOUT2 (Pin 9) | LDO2 regulated output | Delivers 2.5 V at up to 300 mA; requires 1 µF ceramic capacitor to GND for stability |
| VOUT1 (Pin 10) | LDO1 regulated output | Delivers 1.5 V at up to 150 mA; requires 1 µF ceramic capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs with separate enables | Enables selective power sequencing and dynamic rail shutdown - e.g., keep LDO1 active for standby logic while disabling LDO2 during RF sleep mode |
| Programmable POR delay via SET pin | Allows system-level reset timing alignment with processor boot requirements without external timers or RC networks |
| Stability with 1 µF ceramic output capacitors | Reduces BOM count and board area vs. traditional LDOs requiring ≥10 µF tantalum - supports 0402/0603 case sizes |
| Ultra-low 35 µA quiescent current (enabled) | Minimizes standby power loss in battery-powered devices - enables >10-year shelf life for coin-cell applications |
| Thermal shutdown with hysteresis | Protects against sustained overload or poor heatsinking; 20°C hysteresis prevents oscillation near trip point |
Applications
| Wireless Network Adaptors | Cellular Handsets |
|---|---|
|
Use Scenario: Dual-rail power for Wi-Fi/BT combo chip with 1.5 V digital core and 2.5 V RF front-end. IC Role / Device Role / Timing Role: LP3996SD-1525 provides tightly regulated, low-noise supplies with POR synchronized to RF power-up sequence. Use Value: Eliminates need for discrete POR generator and reduces total solution size by 35% versus dual standalone LDOs + supervisor IC. |
Use Scenario: Power management for baseband processor and memory interface requiring clean, sequenced 1.5 V and 2.5 V rails. IC Role / Device Role / Timing Role: LP3996SD-1525 delivers independent enable control and POR flag to coordinate processor boot with memory initialization. Use Value: Enables deterministic power-up timing with <100 ms adjustable POR delay - avoids bus contention during cold start. |
| PDA Systems | Portable Industrial Sensors |
|
Use Scenario: Compact power solution for ARM-based PDA with LCD controller (1.5 V) and touch controller (2.5 V). IC Role / Device Role / Timing Role: LP3996SD-1525 supplies both rails from single Li-ion cell (3.0–4.2 V), using EN1/EN2 for display backlight dimming coordination. Use Value: Achieves 92% efficiency at 150 mA/300 mA loads while maintaining <75 µV RMS output noise - preserves display contrast ratio. |
Use Scenario: Battery-powered sensor node with microcontroller (1.5 V) and analog signal chain (2.5 V ADC reference). IC Role / Device Role / Timing Role: LP3996SD-1525 powers MCU and precision analog section with POR flag triggering wake-up interrupt on valid supply. Use Value: Ultra-low 35 µA IQ extends 2×AA battery life to >5 years in sleep mode; 1.5% initial accuracy ensures ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS70245PWP | Fixed 2.5 V / 3.3 V outputs; higher 180 µA IQ; no integrated POR; 16-pin HTSSOP package | Lacks programmable POR and 1.5 V rail - unsuitable where core voltage must be exactly 1.5 V and reset timing is critical | Select only if 3.3 V second rail is acceptable and board space allows larger package |
| TPS79515-Q1 | Single 1.5 V LDO (150 mA); AEC-Q100 qualified; 250 µA IQ; no second output or POR | Automotive-grade but lacks dual-output capability and POR - requires external supervisor and second regulator | Choose only for automotive applications needing 1.5 V rail alone; not a functional substitute for LP3996SD-1525's dual-POR architecture |
Compared with TPS70245PWP and TPS79515-Q1, LP3996SD-1525 uniquely combines matched 1.5 V/2.5 V outputs, sub-µA shutdown, and integrated programmable POR in a 3 mm × 3 mm package - making it the only option for space-constrained portable designs requiring precise dual-rail sequencing and ultra-low standby power.
Availability
LP3996SD-1525 is available at Aetrix Electronics and suitable for wireless network adaptors, cellular handsets, PDAs, and portable industrial sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP3996SD-1525 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 and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing reliability.
The LP3996SD-1525 belongs to TI's LP39xx family of ultra-low-IQ dual LDOs engineered for portable battery-powered systems where board space, thermal performance, and precise power sequencing are critical.
FAQ
What output voltages does the LP3996SD-1525 provide?
The LP3996SD-1525 provides fixed 1.5 V on VOUT1 and 2.5 V on VOUT2, with ±3.75% tolerance over –40°C to +125°C junction temperature. These values are laser-trimmed at wafer test and cannot be adjusted externally - confirming LP3996SD-1525 as a dedicated dual-rail solution for systems requiring precisely matched low-voltage supplies.
How is the power-on-reset (POR) delay set on the LP3996SD-1525?
The POR delay on LP3996SD-1525 is set by connecting a capacitor between the SET pin (Pin 5) and GND. The internal 1.3 µA current source charges this capacitor to a 1.25 V threshold; delay time equals (1.25 V × CSET) / 1.3 µA. For example, a 0.1 µF capacitor yields ~100 ms delay - a value directly confirmed in the LP3996SD-1525 datasheet Figure 25.
What is the minimum input voltage required for the LP3996SD-1525 to regulate both outputs?
The LP3996SD-1525 requires VIN ≥ VOUT(NOM) + 0.5 V or 2.0 V, whichever is higher. For its 2.5 V LDO2 output, minimum VIN is 3.0 V. Below this, LDO2 drops out and asserts the POR flag. This specification is explicitly defined in the Electrical Characteristics table footnote (3) of the LP3996SD-1525 datasheet.
Can the LP3996SD-1525 operate with ceramic output capacitors smaller than 1 µF?
No - the LP3996SD-1525 is characterized and guaranteed stable only with ≥1.0 µF ceramic output capacitors (X7R/X5R/Z5U) having ESR between 5 mΩ and 500 mΩ. Using smaller values risks instability and oscillation, as confirmed in the "OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS" table and Application Hints section of the LP3996SD-1525 datasheet.
Is the LP3996SD-1525 pin-compatible with other variants in the LP3996 family?
Yes - all LP3996 variants, including LP3996SD-1525/NOPB, share identical WSON-10 (DSC0010A) package, pinout, and electrical interface. Only the fixed output voltage pair differs across part numbers (e.g., LP3996SD-0833 = 0.8 V/3.3 V). This mechanical and functional compatibility is documented in TI's Package Option Addendum for LP3996SD-1525.
LP3996SD-1525 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V, 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.22V @ 150mA, 0.55V @ 150mA
- Current - Output:
- 150mA, 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 170 µA
- PSRR:
- 58dB ~ 45dB, 70dB ~ 60dB (1kHz ~ 20kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LP3996SD-1525 FAQ
1.How can I place an order for LP3996SD-1525 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3996SD-1525 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 LP3996SD-1525 reliable?
The price and inventory of LP3996SD-1525 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3996SD-1525 is usually 5 days.
3.What payment methods are accepted for LP3996SD-1525?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3996SD-1525 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3996SD-1525?
LP3996SD-1525 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3996SD-1525 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 LP3996SD-1525?
For technical support, including LP3996SD-1525 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3996SD-1525 requirements.
6.How does Aetrix verify that LP3996SD-1525 is sourced from the original manufacturer or authorized distributors?
All LP3996SD-1525 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 LP3996SD-1525 meets industry standards.
7.What is the process for return or replacement of LP3996SD-1525?
All LP3996SD-1525 units undergo pre-shipment inspection (PSI). If there is an issue with LP3996SD-1525, 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 LP3996SD-1525 part is unused and in its original packaging.
Return procedure for LP3996SD-1525:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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