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Texas Instruments LP3996SD-3308/NOPB
- Part No.:
- LP3996SD-3308/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LP3996SD-3308/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V/0.8V 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,320
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Product details
Overview
LP3996SD-3308/NOPB from Texas Instruments is a dual low-dropout linear regulator IC with independent 300 mA and 150 mA outputs, fixed 3.3 V / 0.8 V output configuration, power-on-reset (POR) flag with adjustable delay, and ultra-low 35 µA quiescent current in enabled state. It operates from 2.0 V to 6.0 V input and delivers ±1.5% output voltage accuracy at room temperature for portable power management in space-constrained wireless devices.
For engineers reviewing the LP3996SD-3308/NOPB datasheet, LP3996SD-3308/NOPB pinout, LP3996SD-3308/NOPB application, or LP3996SD-3308/NOPB equivalent, key selection considerations include its dual-output voltage pairing (3.3 V / 0.8 V), POR delay programmability via external capacitor on SET pin, WSON-10 package thermal performance (θJA = 55°C/W), and ceramic-capacitor stability with 1 µF output capacitance per rail.
Technical Context
The LP3996SD-3308/NOPB integrates two independent LDO regulators: LDO2 (300 mA, 3.3 V output) includes an open-drain POR flag monitoring its own output, while LDO1 (150 mA, 0.8 V output) supports low-voltage core logic. Each regulator features active-high enable pins (EN1/EN2), internal reference bypass (CBYP), and thermal shutdown protection.
Its POR function asserts low when VOUT2 drops below 88% of nominal (2.904 V), releases high at 96% (3.168 V), and supports user-defined startup delay via capacitor on SET pin (tDELAY ≈ 1.25 V × CSET / 1.3 µA). The device achieves 70 dB PSRR at 1 kHz for LDO2 and maintains stability with 1 µF ceramic output capacitors and ESR between 5 mΩ and 500 mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0 V to 6.0 V - supports single-cell Li-ion, 3.3 V rails, and multi-rail battery systems without external step-up. |
| VOUT1 / VOUT2 | 0.8 V / 3.3 V fixed - powers low-voltage DSP cores and 3.3 V I/O peripherals simultaneously from one IC. |
| Max Output Current | 150 mA (LDO1), 300 mA (LDO2) - sufficient for baseband processors and RF front-end biasing in handhelds. |
| Dropout Voltage | 210 mV at 300 mA (LDO2) - enables operation down to 3.51 V input for 3.3 V output under full load. |
| Quiescent Current | 35 µA (enabled), <10 nA (disabled) - extends battery life in standby and deep-sleep modes. |
| Output Accuracy | ±1.5% at 25°C, ±3% over –40°C to +125°C - ensures reliable microcontroller reset and memory retention. |
| POR Threshold | 88% (assert), 96% (release) of VOUT2 - provides clean, hysteresis-enabled power-good signaling for system sequencing. |
Pinout & Package
LP3996SD-3308/NOPB uses a 10-pin WSON (DSC) package, 3 mm × 3 mm, with exposed thermal pad (GND-connected). Pin 7 is no-connect (N/C); Pin 8 (POR) is open-drain and requires external pull-up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply rail | Accepts 2.0–6.0 V; requires 1 µF ceramic capacitor to GND within 1 cm for stability. |
| EN1 (Pin 2) | LDO1 enable control | Active-high; ties to VIN for permanent enable; VIH = 0.95 V, VIL = 0.4 V. |
| EN2 (Pin 3) | LDO2 enable control | Independent enable for 3.3 V rail; allows staggered power-up or dynamic rail shutdown. |
| CBYP (Pin 4) | Reference bypass | Connect 10 nF NPO/COG capacitor to GND to reduce noise and improve PSRR by up to 15 dB. |
| SET (Pin 5) | POR delay programming | Sources 1.3 µA; connect capacitor to GND to set POR assertion delay (e.g., 0.1 µF ≈ 100 ms). |
| GND (Pin 6) | Common ground | Primary ground connection; must be tied to exposed thermal pad for thermal performance. |
| N/C (Pin 7) | No connection | Not internally bonded; must remain unconnected and floating. |
| POR (Pin 8) | Open-drain POR flag | Asserts low when VOUT2 < 2.904 V; requires external pull-up resistor to VOUT2 or VIN. |
| VOUT2 (Pin 9) | 300 mA LDO2 output | Delivers fixed 3.3 V; requires 1 µF ceramic capacitor to GND; max load 300 mA. |
| VOUT1 (Pin 10) | 150 mA LDO1 output | Delivers fixed 0.8 V; requires 1 µF ceramic capacitor to GND; max load 150 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables simultaneous 0.8 V core and 3.3 V I/O regulation with separate enable control for flexible power sequencing. |
| Adjustable POR delay | External capacitor on SET pin sets precise power-on reset timing (e.g., 100 ms delay with 0.1 µF) for MCU boot coordination. |
| Ceramic-capacitor stable | Guaranteed stability with 1 µF X7R/Y5V/Z5U output caps (ESR 5–500 mΩ), eliminating need for larger, costlier tantalum types. |
| Ultra-low IQ | 35 µA total quiescent current with both LDOs enabled - critical for >1-week battery life in always-on sensor nodes. |
| Thermal shutdown protection | Triggers at 160°C junction temperature with 20°C hysteresis, preventing damage during overload or poor PCB heatsinking. |
Applications
| Cellular Handset Power Management | Wireless Network Adaptor |
|---|---|
Use Scenario: Dual-rail power for baseband processor (0.8 V core) and 3.3 V RF transceiver/I/O in compact GSM/UMTS handset PCBs. IC Role / Device Role: Primary dual-output LDO delivering regulated 0.8 V and 3.3 V from single Li-ion cell (3.0–4.2 V). Use Value: Eliminates need for two discrete regulators and external POR circuitry; reduces BOM count by ≥3 components and saves 12 mm² board area. |
Use Scenario: Powering WLAN/BT combo module requiring tightly sequenced 0.8 V digital core and 3.3 V analog/RF supplies. IC Role / Device Role: Single-chip solution providing independent enable control and POR flag synchronized to 3.3 V rail health. Use Value: Enables deterministic boot sequence via programmable POR delay; prevents firmware lockup due to premature MCU wake-up. |
| PDA System-on-Chip Supply | Portable Medical Sensor Node |
Use Scenario: Powering ARM-based PDA SoC with split-rail requirements: 0.8 V CPU core and 3.3 V display interface, SD card, and USB PHY. IC Role / Device Role: Dual-LDO regulator with thermal protection and low-noise CBYP path for sensitive analog subsystems. Use Value: CBYP pin with 10 nF capacitor reduces output noise to 36 µVRMS (0.8 V rail), preserving ADC SNR in touch-screen controller. |
Use Scenario: Battery-powered wearable ECG sensor requiring ultra-low-quiescent-power 0.8 V MCU core and 3.3 V analog front-end. IC Role / Device Role: Low-IQ dual regulator enabling >14-day runtime on CR2032; POR flag triggers MCU reset on battery brownout. Use Value: <10 nA shutdown current preserves battery charge during sleep; POR hysteresis prevents chatter near 3.0 V cutoff threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7733QPWR | Single-output 3.3 V supervisor with reset timer; no LDO, no 0.8 V rail, no dual enable. | Only provides POR/reset function - cannot replace LP3996SD-3308/NOPB's dual-regulation capability. | Select only if system already has separate 0.8 V/3.3 V regulators and needs only POR extension. |
| TPS79901YZUR | Single 0.8 V, 200 mA LDO with 2.5 µA IQ; no second output, no POR, no SET pin. | Lacks 3.3 V rail and power-good signaling - requires adding discrete POR IC and second LDO. | Use when only 0.8 V rail is needed and ultra-low IQ (<3 µA) is prioritized over integration. |
Compared with TLC7733QPWR and TPS79901YZUR, LP3996SD-3308/NOPB uniquely combines fixed 0.8 V/3.3 V dual regulation, integrated POR with programmable delay, and sub-40 µA IQ in a single 3 mm × 3 mm WSON package - reducing component count, layout complexity, and total solution size by ≥40%.
Availability
LP3996SD-3308/NOPB is available at Aetrix Electronics and suitable for cellular handsets, wireless network adaptors, and portable medical sensor nodes requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for LP3996SD-3308/NOPB 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, embedded processing, and power management ICs, with decades of expertise in low-power, high-reliability power solutions for portable electronics.
The LP3996 product line is designed for space-constrained, battery-operated applications requiring dual-output LDO regulation, precise power sequencing, and integrated POR functionality - targeting handheld communications and portable instrumentation markets.
FAQ
What output voltages does the LP3996SD-3308/NOPB provide?
The LP3996SD-3308/NOPB provides fixed output voltages of 3.3 V on VOUT2 (Pin 9) and 0.8 V on VOUT1 (Pin 10). These values are laser-trimmed at wafer test and cannot be adjusted externally. The "3308" in the part number explicitly denotes this 3.3 V / 0.8 V configuration, confirmed in TI's Package Option Addendum and Electrical Characteristics tables.
How is the power-on-reset (POR) delay programmed on the LP3996SD-3308/NOPB?
The POR delay on LP3996SD-3308/NOPB is programmed by connecting a capacitor between the SET pin (Pin 5) and GND. The delay time follows tDELAY = 1.25 V × CSET / 1.3 µA. For example, a 0.1 µF capacitor yields ~96 ms delay. The SET pin sources a constant 1.3 µA current, and the internal comparator triggers POR release when the capacitor voltage reaches 1.25 V.
What is the maximum allowable input voltage for the LP3996SD-3308/NOPB?
The absolute maximum input voltage for LP3996SD-3308/NOPB is 6.5 V, but the recommended operating range is 2.0 V to 6.0 V per the datasheet's Recommended Operating Conditions table. Exceeding 6.0 V risks violating safe operating area limits, especially under high load, and may trigger thermal shutdown or degrade long-term reliability.
Does the LP3996SD-3308/NOPB require external components for stability?
Yes - LP3996SD-3308/NOPB requires a 1 µF ceramic input capacitor (VIN to GND), a 1 µF ceramic output capacitor per rail (VOUT1/GND and VOUT2/GND), and optionally a 10 nF ceramic capacitor on CBYP (Pin 4) to optimize noise and PSRR. The SET pin capacitor is required only if POR delay is needed. All capacitors must meet ESR (5–500 mΩ) and tolerance (±30%) specs per the Output Capacitor table.
Is the LP3996SD-3308/NOPB compatible with lead-free reflow processes?
Yes - LP3996SD-3308/NOPB is RoHS-compliant and rated for lead-free reflow with MSL Level-1 (260°C peak, unlimited floor life). Its WSON-10 package (DSC drawing) uses Sn finish and is qualified per JEDEC J-STD-020. The datasheet specifies a maximum lead/land temperature of 235°C, and TI's Package Option Addendum confirms "Green (RoHS & no Sb/Br)" eco plan.
LP3996SD-3308/NOPB 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):
- 3.3V, 0.8V
- 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-3308/NOPB FAQ
1.How can I place an order for LP3996SD-3308/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3996SD-3308/NOPB 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-3308/NOPB reliable?
The price and inventory of LP3996SD-3308/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3996SD-3308/NOPB is usually 5 days.
3.What payment methods are accepted for LP3996SD-3308/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3996SD-3308/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3996SD-3308/NOPB?
LP3996SD-3308/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3996SD-3308/NOPB 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-3308/NOPB?
For technical support, including LP3996SD-3308/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3996SD-3308/NOPB requirements.
6.How does Aetrix verify that LP3996SD-3308/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3996SD-3308/NOPB 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-3308/NOPB meets industry standards.
7.What is the process for return or replacement of LP3996SD-3308/NOPB?
All LP3996SD-3308/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3996SD-3308/NOPB, 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-3308/NOPB part is unused and in its original packaging.
Return procedure for LP3996SD-3308/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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