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Texas Instruments LP3988ITLX-1.85/NOPB
- Part No.:
- LP3988ITLX-1.85/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LP3988ITLX-1.85/NOPB.pdf
- Description:
- IC REG LINEAR 1.85V 150MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
LP3988ITLX-1.85/NOPB from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 150 mA output at fixed 1.85 V with ±3% tolerance, 80 mV typical dropout at full load, and integrated open-drain Power Good (PG) flag. It operates from 2.5 V to 6 V input, consumes ≤1 µA in shutdown, and targets battery-powered RF front-ends and baseband ICs in cellular handsets.
For engineers reviewing the LP3988ITLX-1.85/NOPB datasheet, LP3988ITLX-1.85/NOPB pinout, LP3988ITLX-1.85/NOPB application, or LP3988ITLX-1.85/NOPB equivalent, key selection criteria include guaranteed 1.85 V output accuracy over −40°C to +125°C, PG response time ≤10 µs, PSRR ≥45 dB at 10 kHz, and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP3988ITLX-1.85/NOPB integrates a PMOS pass transistor with internal reference and error amplifier to achieve ultra-low dropout and stable regulation under dynamic load. Its enable-controlled startup sequence ensures fast turnon (<100 µs), while the open-drain PG output monitors VOUT against 93% (typ.) high-threshold and 90% (typ.) low-threshold trip points.
Thermal shutdown activates at ~160°C with 20°C hysteresis, and current limiting caps output at ~600 mA. The device requires no external compensation and remains stable with 1-µF X7R ceramic COUT (5–500 mΩ ESR) and 1-µF CIN, enabling compact PCB layouts in space-constrained portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85 V ±3% over −40°C to +125°C - ensures reliable core logic supply for low-voltage ASICs and RF ICs. |
| Max Output Current | 150 mA continuous - sufficient for powering single-core baseband processors or RF transceivers in CDMA/GSM handsets. |
| Dropout Voltage | 80 mV (typ.) at 150 mA - enables operation down to VIN = 1.93 V, extending usable battery range in Li-ion discharge profiles. |
| Quiescent Current | ≤1 µA in shutdown mode - minimizes standby leakage in always-on subsystems like real-time clocks or backup RAM. |
| PSRR | 45 dB at 10 kHz - suppresses switching noise from adjacent DC/DC converters feeding the same battery rail. |
| Power Good Delay | 10 µs (typ.) turnon/turnoff - provides precise sequencing control for downstream logic without external timers. |
| Operating Temp Range | −40°C to +125°C junction - qualified for automotive infotainment and industrial handheld terminals. |
Pinout & Package
LP3988ITLX-1.85/NOPB is packaged in a 5-pin thin DSBGA (YZR) with 1.502 mm × 1.045 mm body size and bottom-side solder bumps. Thermal performance relies on PCB copper area connected to the four peripheral bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5 V to 6 V; must be decoupled with ≥1-µF ceramic capacitor within 1 cm of pin. |
| OUT | Regulated output | Delivers fixed 1.85 V; requires 1-µF ceramic capacitor (X7R/Z5U/Y5V) with 5–500 mΩ ESR for stability. |
| EN | Logic-enable input | Active-high (VIH ≥1.2 V); tie to IN for always-on operation; draws ≤0.1 µA when pulled low. |
| PG | Open-drain Power Good flag | Drives low when VOUT <90% of 1.85 V; requires external pullup to ≤6 V rail (e.g., VIN or VOUT). |
| GND | Ground reference | Common return for IN, OUT, EN, and PG; connects to PCB ground plane via thermal vias under DSBGA bumps. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤1 µA shutdown current extends battery life in sleep-mode applications such as mobile phone standby. |
| Integrated Power Good monitoring | Factory-trimmed 90%/93% VOUT thresholds with 10 µs response enable deterministic power sequencing without external comparators. |
| Ceramic-capacitor optimized | Stable with 1-µF output capacitor eliminates need for bulky tantalum parts, reducing BOM cost and board area by >50%. |
| Thermal and short-circuit protection | 160°C thermal shutdown with 20°C hysteresis and 600 mA current limit prevent damage during overload or poor heatsinking. |
| Wide input voltage range | 2.5 V to 6 V operation supports direct connection to single-cell Li-ion (2.7–4.2 V) or dual-cell alkaline (3–6 V) sources. |
Applications
| CDMA Baseband Power | GSM RF Front-End |
|---|---|
Use Scenario: Powers digital baseband processor core in CDMA handsets requiring clean, low-noise 1.85 V supply during active call mode and deep-sleep states. IC Role / Device Role / Timing Role: Primary LDO regulator providing regulated VDD_CORE with fast enable/disable control and PG confirmation for system reset coordination. Use Value: 80 mV dropout preserves battery runtime down to 1.93 V input; ≤1 µA shutdown current prevents parasitic drain during 72-hour standby. |
Use Scenario: Supplies low-noise bias to power amplifier driver stages and mixer ICs in GSM handset RF sections. IC Role / Device Role / Timing Role: Noise-sensitive analog supply rail with 45 dB PSRR at 10 kHz rejecting switching noise from nearby buck converters. Use Value: 220 µVRMS output noise avoids AM-to-PM distortion; PG flag synchronizes PA enable with stable VDD ramp-up. |
| Portable Medical Sensor Hub | Industrial Handheld Terminal |
Use Scenario: Delivers precision 1.85 V reference to ADCs and low-power microcontrollers in battery-operated glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: High-accuracy voltage source with ±3% output tolerance and −40°C to +125°C operation for clinical-grade measurement integrity. Use Value: Guaranteed 1.85 V output across temperature ensures consistent ADC full-scale calibration; no-load stability maintains VREF during sensor sleep cycles. |
Use Scenario: Powers FPGA configuration memory and I/O banks in ruggedized warehouse scanners operating in wide ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade LDO with 125°C max junction rating and thermal hysteresis ensuring reliability in unventilated enclosures. Use Value: 160°C thermal shutdown prevents latch-up during sustained 50°C ambient + self-heating; PG flag validates supply before FPGA boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LDR | 7-channel high-side driver with integrated 1.8-V LDO; no PG output; 200-mA per channel; larger SOT-23-8 package. | Targeted at LED/motor driver integration, not standalone precision regulation. | Select only if driving discrete loads alongside regulation is required; not a drop-in replacement. |
| TPS7A05185PDBVR | 150-mA LDO with 1.85 V output, 1.4-μA IQ, but no PG flag; uses SOT-23-5 package with identical pinout except PG pin repurposed as NC. | Lacks power sequencing capability; suitable where system-level monitoring replaces chip-level PG. | Choose when PG is unnecessary and lowest possible quiescent current (1.4 μA vs. LP3988's 150 μA active IQ) is critical. |
Compared with TPL7407LDR and TPS7A05185PDBVR, LP3988ITLX-1.85/NOPB uniquely combines 1.85 V precision regulation, integrated PG flag, and DSBGA footprint-enabling smaller, sequenced, and fault-monitored power rails in ultra-compact portable electronics.
Availability
LP3988ITLX-1.85/NOPB is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable medical sensor hubs, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP3988ITLX-1.85/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
LP3988ITLX-1.85/NOPB belongs to TI's micropower LDO family engineered for battery-powered wireless devices, emphasizing ultra-low dropout, minimal quiescent current, and integrated power monitoring to maximize runtime and system reliability.
FAQ
What is the output voltage tolerance of LP3988ITLX-1.85/NOPB over temperature?
The LP3988ITLX-1.85/NOPB delivers 1.85 V output with ±3% tolerance across the full −40°C to +125°C junction temperature range, as specified in the Electrical Characteristics table (Section 6.5). This tolerance applies to both SOT-23 and DSBGA packages and ensures stable core voltage for low-voltage logic in demanding environments.
Does LP3988ITLX-1.85/NOPB require an external pullup resistor on the PG pin?
Yes, LP3988ITLX-1.85/NOPB features an open-drain PG output that requires an external pullup resistor to a valid rail (≤6 V, e.g., VIN or VOUT). Typical values range from 10 kΩ to 100 kΩ. Without this pullup, the PG signal cannot assert high to indicate "VOUT OK", rendering power sequencing nonfunctional.
Can LP3988ITLX-1.85/NOPB operate with a 1.8-V input supply?
No, LP3988ITLX-1.85/NOPB requires a minimum input voltage of 2.5 V or (VOUT + 200 mV), whichever is greater. For its 1.85 V output, the minimum VIN is 2.05 V-but the datasheet explicitly specifies 2.5 V as the absolute lower limit. A 1.8-V input falls below specification and will not sustain regulation.
What is the maximum allowable output capacitor ESR for stable operation of LP3988ITLX-1.85/NOPB?
The LP3988ITLX-1.85/NOPB is stable with output capacitor ESR between 5 mΩ and 500 mΩ, as confirmed in Section 6.5 and Application Note SNVS161E. Using an ESR outside this range-especially below 5 mΩ (e.g., some high-end polymer caps)-may cause oscillation or poor transient response.
Is LP3988ITLX-1.85/NOPB pin-compatible with other variants in the LP3988 family?
Yes, all LP3988 variants-including LP3988ITLX-1.85/NOPB-share identical 5-pin DSBGA (YZR) and SOT-23 (DBV) footprints and pin functions (IN, OUT, EN, PG, GND). Output voltage is factory-trimmed; no external resistors are needed, enabling direct substitution across 1.5 V to 3.3 V versions when board layout permits.
LP3988ITLX-1.85/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):
- 1.85V
- 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-1.85/NOPB FAQ
1.How can I place an order for LP3988ITLX-1.85/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3988ITLX-1.85/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-1.85/NOPB reliable?
The price and inventory of LP3988ITLX-1.85/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-1.85/NOPB is usually 5 days.
3.What payment methods are accepted for LP3988ITLX-1.85/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3988ITLX-1.85/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3988ITLX-1.85/NOPB?
LP3988ITLX-1.85/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3988ITLX-1.85/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-1.85/NOPB?
For technical support, including LP3988ITLX-1.85/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3988ITLX-1.85/NOPB requirements.
6.How does Aetrix verify that LP3988ITLX-1.85/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3988ITLX-1.85/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-1.85/NOPB meets industry standards.
7.What is the process for return or replacement of LP3988ITLX-1.85/NOPB?
All LP3988ITLX-1.85/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3988ITLX-1.85/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-1.85/NOPB part is unused and in its original packaging.
Return procedure for LP3988ITLX-1.85/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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