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Texas Instruments LP3985ITLX-4.8/NOPB
- Part No.:
- LP3985ITLX-4.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LP3985ITLX-4.8/NOPB.pdf
- Description:
- IC REG LINEAR 4.8V 150MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
LP3985ITLX-4.8/NOPB from Texas Instruments is a micropower, ultra-low-noise, 150mA CMOS low-dropout voltage regulator in a 5-bump DSBGA package, delivering 4.8V output with ≤100mV dropout at full load, 30µVrms output noise (10Hz–100kHz), and 1.5µA shutdown quiescent current-designed for RF-sensitive sections of CDMA/GSM handsets and portable information appliances.
For engineers reviewing the LP3985ITLX-4.8/NOPB datasheet, LP3985ITLX-4.8/NOPB pinout, LP3985ITLX-4.8/NOPB application, or LP3985ITLX-4.8/NOPB equivalent, key selection criteria include its 4.8V fixed output, DSBGA thermal performance (θJA = 255°C/W), fast 200µs turn-on time with bypass capacitor, and stability with 1µF ceramic output capacitors-critical for space-constrained battery-powered designs requiring low EMI and extended runtime.
Technical Context
The LP3985ITLX-4.8/NOPB employs a CMOS pass transistor architecture optimized for ultra-low quiescent current and minimal dropout voltage across its 2.5V–6.0V input range. Its internal bandgap reference (1.23V) and fast-turn-on circuit actively pre-charge the BYPASS pin capacitor to achieve sub-200µs startup without compromising transient response.
It integrates thermal shutdown (160°C trip, 20°C hysteresis) and short-circuit current limiting (600mA steady-state), while maintaining >40dB PSRR at 10kHz and stable operation with ceramic or high-quality tantalum output capacitors (0.7–1.0µF, 5–500mΩ ESR). The enable logic (VIH = 1.4V, VIL = 0.4V) supports direct microcontroller interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.8V ±2% (typical tolerance); ensures precise biasing for 4.8V-tolerant RF ICs and baseband processors. |
| Max Output Current | 150mA verified; sufficient to power GSM/CDMA transceiver LNA stages or PMIC auxiliary rails. |
| Dropout Voltage | ≤100mV at 150mA load; enables operation down to VIN = 4.9V, extending usable battery life in single-cell Li-ion systems. |
| Output Noise | 30µVrms (10Hz–100kHz); minimizes phase noise in local oscillator chains and ADC reference supplies. |
| Quiescent Current | ≤1.5µA in shutdown mode; critical for maintaining standby current budgets in always-on cellular modules. |
| PSRR @ 1kHz | 50dB at VIN = VOUT + 0.2V; suppresses switching noise from DC/DC converters feeding the LDO input. |
| Turn-On Time | 200µs typical with 0.01µF BYPASS cap; enables rapid power sequencing in wake-up events without supply brownout. |
Pinout & Package
LP3985ITLX-4.8/NOPB uses the 5-bump thin DSBGA package (Package Number TLA05, 1.0mm × 1.0mm footprint), optimized for minimal PCB area in handheld devices. Thermal resistance is θJA = 255°C/W, with maximum junction temperature rated to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.5–6.0V; must be decoupled with ≥1µF ceramic capacitor placed within 1cm of pin. |
| VOUT | Regulated output | Delivers stable 4.8V; requires 0.7–1.0µF X7R ceramic output capacitor (5–500mΩ ESR) for stability. |
| VEN | Logic-enable input | Active-high control (VIH ≥1.4V); tie to VIN for always-on operation or drive from GPIO for dynamic power gating. |
| GND | Common ground reference | Return path for all currents; must connect to clean analog ground plane to preserve noise performance. |
| BYPASS | Noise reduction node | Connects to 0.01µF NPO/COG ceramic cap to ground; reduces output noise without degrading load transients. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower shutdown | 1.5µA max IQ in disable mode extends battery shelf life in portable devices with infrequent wake cycles. |
| Ultra-low-noise regulation | 30µVrms output noise enables use in RF front-end biasing where phase jitter directly impacts EVM. |
| Fast, capacitor-controlled startup | 200µs turn-on achieved via internal 70µA pre-charge current on BYPASS pin-no external timing components needed. |
| Stable with miniature ceramics | Guaranteed stability with 1µF ±30% X7R ceramic output caps, enabling <2.0mm × 2.5mm total circuit area. |
| Integrated protection | Thermal shutdown (160°C) and 600mA short-circuit current limit prevent damage during fault conditions in compact layouts. |
Applications
| CDMA Cellular Handset Power Management | GSM Transceiver RF Bias Supply |
|---|---|
Use Scenario: Providing clean, low-noise bias to power amplifier driver stages in CDMA handset front-ends. IC Role / Device Role / Timing Role: Ultra-low-noise LDO supplying 4.8V to PA driver ICs, rejecting noise from shared PMIC switchers. Use Value: 30µVrms noise prevents AM-to-PM conversion in PA stages, maintaining ACLR compliance under high-power transmission. |
Use Scenario: Delivering regulated 4.8V to GSM RF synthesizer VCO and mixer bias circuits. IC Role / Device Role / Timing Role: Fixed-output LDO with fast turn-on supporting burst-mode transmit/receive timing in GMSK modulation. Use Value: 200µs startup ensures VCO bias settles before TX window opens, eliminating frequency drift during packet transmission. |
| Portable Information Appliance Core Logic Rail | Low-Power Microcontroller Keep-Alive Supply |
Use Scenario: Powering ARM Cortex-M based application processors in handheld PDAs and barcode scanners. IC Role / Device Role / Timing Role: Primary 4.8V core rail LDO with tight line/load regulation (±0.1%/V, ±0.0025%/mA) for digital logic stability. Use Value: ≤100mV dropout allows operation until battery reaches 4.9V, maximizing usable capacity in single-cell Li-ion systems. |
Use Scenario: Maintaining real-time clock and SRAM backup power during deep-sleep modes in IoT edge nodes. IC Role / Device Role / Timing Role: Always-on micropower LDO with no-load stability and 1.5µA shutdown current. Use Value: Enables multi-year battery life in coin-cell powered devices by minimizing quiescent drain during 99%+ sleep duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7705IPW | 5V fixed output, SOT-23-5 package, 250mA rating, 120µA quiescent current in operation (vs. 150µA for LP3985ITLX-4.8/NOPB), no BYPASS pin for noise reduction. | Higher IQ and no dedicated noise-reduction path limit suitability in RF-sensitive 4.8V applications. | Select only if 5.0V output is acceptable and board space permits larger SOT-23 footprint. |
| TPS78248DRVR | 4.8V fixed output, 150mA, 1.3µA shutdown IQ, 25µVrms noise, WSON-6 package (1.5mm × 1.5mm), includes active discharge. | Same output voltage and lower noise, but larger footprint and active discharge may conflict with hold-up capacitor requirements. | Prefer when lowest possible noise (25µVrms) is mandatory and WSON-6 layout is feasible. |
Compared with TLC7705IPW and TPS78248DRVR, LP3985ITLX-4.8/NOPB offers the smallest footprint (1.0mm × 1.0mm DSBGA), integrated BYPASS noise reduction, and optimal balance of 4.8V precision, 30µVrms noise, and 1.5µA shutdown current for space-constrained cellular RF subsystems.
Availability
LP3985ITLX-4.8/NOPB is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable information appliance development, and low-power microcontroller keep-alive circuits requiring stable component supply with consistent parametric performance across production volumes.
Supply support for LP3985ITLX-4.8/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 connectivity technologies, with over 90 years of innovation in power management and signal chain solutions.
The LP3985 product line was designed specifically for portable wireless applications demanding ultra-low noise, micropower operation, and minimal PCB area-targeting cellular handsets, PDAs, and other battery-powered RF systems where EMI and runtime are critical.
FAQ
What is the maximum input voltage rating for LP3985ITLX-4.8/NOPB?
The absolute maximum input voltage (VIN) for LP3985ITLX-4.8/NOPB is 6.5V, but the recommended operating range is 2.5V to 6.0V per the datasheet. Exceeding 6.5V risks permanent damage. For reliable operation in Li-ion battery applications, VIN should remain ≤6.0V even at full charge (4.2V nominal + tolerance).
Does LP3985ITLX-4.8/NOPB require an external bypass capacitor to meet its 30µVrms noise specification?
Yes-LP3985ITLX-4.8/NOPB achieves its specified 30µVrms output noise (10Hz–100kHz) only when a 0.01µF NPO/COG ceramic capacitor is connected between the BYPASS pin and ground. Without this capacitor, output noise increases significantly, impacting RF-sensitive applications like VCO biasing.
Can LP3985ITLX-4.8/NOPB operate stably with a 0.7µF output capacitor?
Yes-LP3985ITLX-4.8/NOPB is specified to remain stable with output capacitance as low as 0.7µF (±30% tolerance), provided the capacitor is X7R dielectric and meets ESR requirements (5–500mΩ). This enables ultra-compact designs where board space is constrained.
What is the thermal shutdown behavior of LP3985ITLX-4.8/NOPB?
LP3985ITLX-4.8/NOPB activates thermal shutdown at 160°C junction temperature and remains latched off until junction temperature falls by 20°C (hysteresis), resuming regulation at ~140°C. This protects the device during sustained overload or poor PCB thermal design in the 1.0mm × 1.0mm DSBGA package.
Is LP3985ITLX-4.8/NOPB compatible with lead-free reflow processes?
Yes-LP3985ITLX-4.8/NOPB carries the "/NOPB" suffix indicating lead-free (Pb-free) construction with CU SN (copper-tin) terminal finish and is rated for MSL Level-1 (260°C peak reflow), fully compliant with IPC/JEDEC J-STD-020 standards for surface-mount assembly.
LP3985ITLX-4.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 4.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.1V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 50dB ~ 40dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LP3985ITLX-4.8/NOPB FAQ
1.How can I place an order for LP3985ITLX-4.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3985ITLX-4.8/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 LP3985ITLX-4.8/NOPB reliable?
The price and inventory of LP3985ITLX-4.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3985ITLX-4.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3985ITLX-4.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3985ITLX-4.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3985ITLX-4.8/NOPB?
LP3985ITLX-4.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3985ITLX-4.8/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 LP3985ITLX-4.8/NOPB?
For technical support, including LP3985ITLX-4.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3985ITLX-4.8/NOPB requirements.
6.How does Aetrix verify that LP3985ITLX-4.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3985ITLX-4.8/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 LP3985ITLX-4.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3985ITLX-4.8/NOPB?
All LP3985ITLX-4.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3985ITLX-4.8/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 LP3985ITLX-4.8/NOPB part is unused and in its original packaging.
Return procedure for LP3985ITLX-4.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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