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Texas Instruments LP3988ITLX-2.85/NOPB
- Part No.:
- LP3988ITLX-2.85/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LP3988ITLX-2.85/NOPB.pdf
- Description:
- IC REG LINEAR 2.85V 150MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,497
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Product details
Overview
LP3988ITLX-2.85/NOPB from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 150 mA at fixed 2.85 V output with ±3% tolerance over −40°C to +125°C, featuring integrated Power Good (PG) open-drain flag and logic-controlled enable. It operates from 2.5 V to 6 V input, achieves 80 mV typical dropout at full load, and consumes ≤1 µA in shutdown-optimized for battery-powered mobile handsets and portable information appliances.
For engineers reviewing the LP3988ITLX-2.85/NOPB datasheet, LP3988ITLX-2.85/NOPB pinout, LP3988ITLX-2.85/NOPB application, or LP3988ITLX-2.85/NOPB equivalent, key selection criteria include its 2.85 V fixed output, 100 µs typical turnon time, 40 dB PSRR at 10 kHz, PG threshold accuracy (93%–95% VOUT), and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LP3988ITLX-2.85/NOPB integrates a PMOS pass transistor with internal reference and error amplifier to achieve ultra-low dropout and stable regulation with 1-µF ceramic capacitors. Its PG circuitry uses dual thresholds (VTHL = 90%–95%, VTHH = 92%–98% of VOUT) with 10 µs typical response and open-drain output requiring external pullup.
Enable control is TTL/CMOS-compatible (VIH = 1.2 V min, VIL = 0.5 V max), and thermal shutdown activates at ~160°C with ~20°C hysteresis. Dropout operation occurs when VIN < VOUT + 80 mV (typ), where OUT tracks IN minus load-dependent drop-no UVLO, but behavior undefined below VIN = 2.5 V or VOUT + 200 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±3% over −40°C to +125°C - ensures stable core/sensor rail in portable devices without external feedback. |
| Max Output Current | 150 mA continuous - supports baseband processors, RF ICs, and memory in cellular handsets. |
| Dropout Voltage | 80 mV (typ) at 150 mA - enables operation down to 2.93 V input, extending battery runtime in single-cell Li-ion systems. |
| Quiescent Current | ≤1 µA in shutdown, 85–120 µA (typ) active - minimizes standby drain in always-on subsystems like RTC or PMIC sequencing. |
| PSRR @ 10 kHz | 45 dB (min) - suppresses switching noise from DC/DC converters feeding the LDO input. |
| Power Good Threshold | VTHL = 90%–95%, VTHH = 92%–98% of VOUT - provides reliable reset signaling for microcontrollers during brownout recovery. |
| Enable Logic Threshold | VIH = 1.2 V (min), VIL = 0.5 V (max) - compatible with 1.8 V/2.8 V GPIO without level-shifting. |
| Thermal Shutdown | 160°C activation with 20°C hysteresis - protects against sustained overload without requiring external thermal management. |
Pinout & Package
LP3988ITLX-2.85/NOPB is packaged in a 5-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size and GND-connected tab for thermal conduction. Pin 2 is GND; Pin 1 is IN; Pin 3 is EN; Pin 4 is PG; Pin 5 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5 V–6 V; requires ≥1 µF ceramic capacitor close to pin for stability and transient response. |
| GND (Pin 2) | Ground reference | Primary thermal path; must connect to large copper pour with thermal vias for power dissipation up to 322 mW. |
| EN (Pin 3) | Logic enable input | Active-high control: ≥1.2 V enables regulator; ≤0.5 V disables it and reduces IQ to ≤1 µA. |
| PG (Pin 4) | Open-drain Power Good flag | Low when VOUT < 95% VOUT (typ); requires external pullup to VOUT or VIN (≤6 V) for system monitoring. |
| OUT (Pin 5) | Regulated output | Delivers 2.85 V ±3% at up to 150 mA; stable with 1–22 µF ceramic COUT (5–500 mΩ ESR). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤1 µA shutdown current extends battery life in always-on applications such as real-time clocks and backup memory. |
| Fast 100 µs turnon time | Enables rapid power-up sequencing for low-power microcontrollers and wake-from-sleep events without delay penalties. |
| Stable with 1-µF ceramic output cap | Eliminates need for larger, costlier tantalum capacitors-reduces BOM count and board area in compact handheld designs. |
| Integrated Power Good flag | Provides deterministic system reset signaling without external comparators or voltage monitors, simplifying power sequencing. |
| Thermal shutdown with hysteresis | Prevents permanent damage during sustained overload while allowing automatic recovery once junction cools to ~140°C. |
| Wide input range (2.5 V–6 V) | Supports direct connection to single-cell Li-ion (3.0–4.2 V), Li-polymer, or dual-cell alkaline batteries without pre-regulation. |
Applications
| CDMA Cellular Handsets | Portable Information Appliances |
|---|---|
|
Use Scenario: Powering baseband processor I/O rails and RF transceiver bias supplies in CDMA handsets operating on single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 2.85 V to sensitive analog/RF blocks with fast transient response and low noise. Use Value: 45 dB PSRR at 10 kHz suppresses noise from high-frequency DC/DC converters; 80 mV dropout preserves runtime down to 2.93 V battery voltage. |
Use Scenario: Supplying 2.85 V to microcontroller cores and sensor interfaces in handheld PDAs, barcode scanners, and medical diagnostic tools. IC Role / Device Role / Timing Role: System-level voltage regulator enabling low-power sleep modes via EN control and precise power-good signaling for safe wake-up. Use Value: ≤1 µA shutdown current prevents battery depletion during weeks-long storage; ±3% output tolerance ensures reliable MCU operation across temperature. |
| GSM Cellular Handsets | Tiny 2.85 V Converter |
|
Use Scenario: Generating stable 2.85 V rail for GSM PA drivers and SIM card interfaces where space and efficiency are critical. IC Role / Device Role / Timing Role: Compact, low-noise LDO replacing discrete regulators in tight RF module footprints. Use Value: SOT-23-5 package (2.9 × 1.6 mm) fits within 3 mm² PCB area; 1-µF ceramic stability eliminates need for bulky input/output caps. |
Use Scenario: Replacing adjustable LDOs or linear regulators in legacy designs requiring precise 2.85 V output with minimal external components. IC Role / Device Role / Timing Role: Drop-in fixed-output replacement reducing design complexity and qualification effort. Use Value: Factory-trimmed 2.85 V output eliminates resistor divider tuning; same pinout and electrical specs as other LP3988 variants simplify migration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 150-mA N-channel array with 3.3 V/5 V logic interface; no PG flag; higher IQ (2.5 µA typ) | Designed for LED driver multiplexing-not suitable for single-rail precision regulation | Select only if multi-channel sink-driving is required; not a functional substitute for LP3988ITLX-2.85/NOPB's regulated output. |
| MCP1700T-2802E/TT | 250-mA LDO, 2.8 V fixed output, ±2% tolerance, 6 µA IQ, no PG flag, SOT-23-3 package | Lacks Power Good signaling and EN control; 3-pin package omits PG and EN terminals | Use where PG/EN are unnecessary and tighter output tolerance (±2%) is prioritized over low IQ and PG functionality. |
Compared with LP3988ITLX-2.85/NOPB, TPL7407LPGEDR serves a different functional class (driver vs. regulator), while MCP1700T-2802E/TT trades away PG/EN capability and ultra-low IQ for tighter output tolerance and higher current-but cannot replicate the precise 2.85 V rail with fault monitoring in space-constrained portable systems.
Availability
LP3988ITLX-2.85/NOPB is available at Aetrix Electronics and suitable for CDMA/GSM handset power management, portable information appliance subsystems, and battery-backed sensor node regulation requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LP3988ITLX-2.85/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs, signal chain solutions, and high-reliability components for industrial, automotive, and consumer markets.
The LP3988 series belongs to TI's micropower LDO portfolio designed specifically for battery-powered portable electronics-emphasizing ultra-low dropout, sub-µA shutdown current, and integrated power-good monitoring to simplify power architecture in space- and energy-constrained devices.
FAQ
What is the output voltage tolerance of LP3988ITLX-2.85/NOPB over temperature?
The LP3988ITLX-2.85/NOPB delivers 2.85 V output with ±3% tolerance across the full operating junction temperature range of −40°C to +125°C. This specification applies to both SOT-23 and DSBGA packages and is verified per TI's production test flow. The tolerance includes initial trim accuracy, line/load regulation, and thermal drift-ensuring reliable operation in handheld and automotive-adjacent environments where ambient temperature swings are extreme.
Does LP3988ITLX-2.85/NOPB require an external pullup resistor on the PG pin?
Yes, LP3988ITLX-2.85/NOPB features an open-drain PG output that requires an external pullup resistor to either VOUT or VIN (≤6 V). A typical value is 100 kΩ, selected to ensure PG logic high exceeds VIH of downstream monitoring logic while limiting leakage current. Without the pullup, PG remains floating and cannot assert a valid high state-making the flag unusable for system reset or sequencing control in designs using LP3988ITLX-2.85/NOPB.
Can LP3988ITLX-2.85/NOPB operate with input voltage below 2.5 V?
No, LP3988ITLX-2.85/NOPB is not specified to operate with VIN below 2.5 V. Per the datasheet, minimum input voltage is the greater of 2.5 V or VOUT + 200 mV (i.e., 3.05 V for LP3988ITLX-2.85/NOPB). Below this threshold, device behavior is undefined-regulation fails, PG flag becomes unreliable, and internal circuitry may not initialize correctly. For sub-2.5 V operation, consider TI's TPS7A05 series or alternative ultra-low-VIN LDOs.
What is the maximum allowable power dissipation for LP3988ITLX-2.85/NOPB in SOT-23 package?
The maximum allowable power dissipation for LP3988ITLX-2.85/NOPB in SOT-23 (DBV) package is 322 mW under recommended operating conditions (TA = 70°C, TJ = 125°C, RθJA = 170.5°C/W). This value derates by 4.5 mW/°C below 70°C ambient and 5.86 mW/°C above it. Exceeding this limit risks thermal shutdown activation or long-term reliability degradation-designers must verify PD = (VIN – 2.85 V) × IOUT stays within the derated envelope for their layout and ambient conditions.
Is LP3988ITLX-2.85/NOPB compatible with ceramic output capacitors smaller than 1 µF?
No, LP3988ITLX-2.85/NOPB requires a minimum 1 µF ceramic output capacitor for guaranteed stability across all operating conditions. The datasheet specifies 1–22 µF range with 5–500 mΩ ESR; using <1 µF violates the stability criterion and may cause oscillation or poor transient response. X7R dielectric is recommended for temperature stability; Z5U/Y5V types risk capacitance loss >50% at high temperature, potentially falling below the 1 µF minimum.
LP3988ITLX-2.85/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):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 200 µA
- PSRR:
- 65dB ~ 45dB (1kHz ~ 10kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LP3988ITLX-2.85/NOPB FAQ
1.How can I place an order for LP3988ITLX-2.85/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3988ITLX-2.85/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 LP3988ITLX-2.85/NOPB reliable?
The price and inventory of LP3988ITLX-2.85/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3988ITLX-2.85/NOPB is usually 5 days.
3.What payment methods are accepted for LP3988ITLX-2.85/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3988ITLX-2.85/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3988ITLX-2.85/NOPB?
LP3988ITLX-2.85/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3988ITLX-2.85/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 LP3988ITLX-2.85/NOPB?
For technical support, including LP3988ITLX-2.85/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3988ITLX-2.85/NOPB requirements.
6.How does Aetrix verify that LP3988ITLX-2.85/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3988ITLX-2.85/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 LP3988ITLX-2.85/NOPB meets industry standards.
7.What is the process for return or replacement of LP3988ITLX-2.85/NOPB?
All LP3988ITLX-2.85/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3988ITLX-2.85/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 LP3988ITLX-2.85/NOPB part is unused and in its original packaging.
Return procedure for LP3988ITLX-2.85/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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