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Texas Instruments LP3927ILQX-AZ/NOPB
- Part No.:
- LP3927ILQX-AZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LP3927ILQX-AZ/NOPB.pdf
- Description:
- IC PWR MNGMNT CELL/PCS 28WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
LP3927ILQX-AZ/NOPB from Texas Instruments (formerly National Semiconductor) is a highly integrated cellular/PCS handset power management IC containing five LDO regulators, a reset timer, power-up control logic, an open-drain LED driver, and a rail-to-rail op-amp. It delivers 150 mA (LDO1/LDO4), 200 mA (LDO2/LDO5), and 100 mA (LDO3) with 100 mV typical dropout at full load, operates from 3.0 V to 5.5 V input, and targets single-cell Li⁺ portable systems requiring intelligent sequencing and backlight control.
For engineers reviewing the LP3927ILQX-AZ/NOPB datasheet, LP3927ILQX-AZ/NOPB pinout, LP3927ILQX-AZ/NOPB application, or LP3927ILQX-AZ/NOPB equivalent, key selection considerations include factory-programmed output voltages (1.85 V / 3.00 V / 3.00 V / 3.00 V / 3.00 V), 28-pin LLP thermal package, LDO enable independence, LED current programmability up to 150 mA, and integrated op-amp with 600 kHz GBW and rail-to-rail I/O.
Technical Context
The LP3927ILQX-AZ/NOPB implements hierarchical power sequencing: KYBD or VEXT assertion enables LDO1 first, followed by LDO2 after 125 µs (standard delay), triggering RST after 20 ms once both reach 95% of target voltage. PS_HOLD timing (500 ms max hold-up) governs system-level power state transitions and shutdown initiation.
Its five LDOs are partitioned across three input rails (VDD1/VDD2/VDD3 tied externally), each optimized for low noise (27 µVrms) and high PSRR (45 dB @ 100 Hz), with independent enable pins for LDO3–LDO5 and shared KYBD/VEXT control for LDO1/LDO2. The integrated op-amp features 0.5 mA supply current, 0.7 V/µs slew rate, and 1.2 mV input offset - all specified over −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 5.5 V - supports full discharge range of single Li⁺ battery (3.0 V cutoff) and accommodates charger-induced transients. |
| LDO Output Current Ratings | LDO1/LDO4: 150 mA; LDO2/LDO5: 200 mA; LDO3: 100 mA - sufficient for baseband processor core, RF section, memory, and peripherals in compact handsets. |
| Dropout Voltage | 100 mV typ @ IMAX - minimizes conduction loss and extends battery runtime under heavy load conditions. |
| LED Driver Current | Programmable up to 150 mA via external resistor - enables direct drive of multi-LED backlight arrays without external FET. |
| Op-Amp Gain-Bandwidth | 600 kHz - suitable for sensor signal conditioning, battery voltage monitoring, and feedback loop compensation in PMIC subsystems. |
| Package | 28-pin LLP (5 mm × 5 mm × 0.75 mm) with exposed thermal pad - provides low θJA (30.8°C/W) when soldered to PCB thermal land with vias. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade portable electronics operating in variable ambient environments. |
Pinout & Package
The LP3927ILQX-AZ/NOPB is housed in a 28-pin Leadless Leadframe Package (LLP) measuring 5 mm × 5 mm × 0.75 mm with an exposed die attach pad for enhanced thermal dissipation. Thermal performance requires PCB-level implementation of a 1:1 thermal land and ≥4 thermal vias connected to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO1 | LDO1 output | 150 mA regulated output at 1.85 V (factory-programmed for AZ variant); powers keyboard controller or low-voltage logic. |
| EN5, EN4, EN3 | Independent LDO enable inputs | Digital control lines allowing selective activation of LDO5 (3.00 V), LDO4 (3.00 V), and LDO3 (3.00 V) - enables dynamic power gating. |
| RST | Open-drain reset output | Active-low signal with 20 ms delay after LDO2 stabilization - synchronizes microprocessor exit from reset with stable power rails. |
| IRQ | Open-drain interrupt output | Asserted on KYBD debounce (>32 ms); signals processor that power-on sequence has initiated or keyboard event occurred. |
| PS_HOLD | Processor-supplied power-hold input | High-valid signal indicating system stability; must go high within 500 ms of RST to prevent automatic shutdown. |
| KYBD | Keyboard "On/Off" input | Active-high trigger for primary power-up sequence; initiates LDO1 enable and IRQ assertion. |
| VEXT | External charger detect input | Active-low signal indicating battery charger insertion; triggers alternate power-up path or maintains LDO operation during charging. |
| LED_EN | LED driver enable | Controls 150 mA open-drain sink (LED pin); high = active; used for backlight on/off sequencing synchronized with display enable. |
| LED_PGM | LED current programming | Connects external resistor (e.g., 130 kΩ for 150 mA) to set precise backlight current - eliminates need for external current-sense amplifier. |
| OP_AMP_OUT / IN+ / IN− / OP_AMP_VDD | Integrated op-amp interface | Rail-to-rail I/O amplifier powered from dedicated 3.0–5.5 V supply; used for battery voltage scaling, temperature sensing, or DAC buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Five independently configurable LDOs | Factory-set output voltages (AZ variant: 1.85 V / 3.00 V / 3.00 V / 3.00 V / 3.00 V) with dedicated enables for LDO3–LDO5 - enables fine-grained power domain control and leakage reduction. |
| Intelligent power sequencing logic | Hardware-based startup/shutdown timing (125 µs LDO delay, 20 ms RST delay, 500 ms PS_HOLD hold-up) - eliminates need for external microcontroller firmware coordination. |
| 150 mA programmable LED driver | Single-pin current programming via external resistor (LED_PGM) - simplifies backlight design and reduces BOM count versus discrete FET + sense resistor solutions. |
| Low-noise, high-PSRR LDO architecture | 27 µVrms output noise and 45 dB PSRR @ 100 Hz - preserves signal integrity for sensitive RF and audio circuits sharing same battery source. |
| Rail-to-rail op-amp with 600 kHz GBW | Operates from 3.0 V to 5.5 V supply with 0.5 mA quiescent current - supports precision analog functions (e.g., battery gauge, thermal monitor) without external amplification. |
Applications
| Mobile Handset Power Sequencing | Backlight Control Subsystem |
|---|---|
Use Scenario: Powering baseband processor, RF transceiver, memory, and peripheral ICs in GSM/CDMA handsets with strict voltage sequencing requirements. IC Role / Device Role / Timing Role: LP3927ILQX-AZ/NOPB acts as central power sequencer - enabling LDO1 (1.85 V) on KYBD press, then LDO2 (3.00 V) after 125 µs, asserting RST after 20 ms to release processor from reset. Use Value: Eliminates external timing components and firmware dependencies; ensures reliable boot under varying battery voltage (3.0–5.5 V) and temperature (−40°C to +85°C). | Use Scenario: Driving white LED backlight arrays in QVGA/TFT displays of feature phones and early smartphones. IC Role / Device Role / Timing Role: LP3927ILQX-AZ/NOPB provides 150 mA constant-current sink via LED pin, enabled by LED_EN and programmed by external resistor on LED_PGM. Use Value: Replaces discrete MOSFET + current-sense resistor + op-amp solution; achieves ±10% current accuracy over temperature with no calibration required. |
| Battery Voltage Monitoring | RF Section Bias Supply |
Use Scenario: Scaling and conditioning battery voltage for ADC input in fuel-gauge or system health monitoring circuits. IC Role / Device Role / Timing Role: LP3927ILQX-AZ/NOPB's integrated rail-to-rail op-amp buffers and attenuates battery voltage (e.g., 3.0–4.2 V) to fit 0–3.3 V ADC range. Use Value: Uses dedicated OP_AMP_VDD supply and low 1.2 mV input offset to maintain <1% measurement error across full battery discharge curve. | Use Scenario: Providing clean, low-noise bias voltage to power amplifier stages and RF front-end ICs in PCS-band handsets. IC Role / Device Role / Timing Role: LP3927ILQX-AZ/NOPB supplies 3.00 V from LDO5 (200 mA) with 27 µVrms noise and 45 dB PSRR - isolated from digital switching noise on shared VDD rail. Use Value: Prevents AM modulation of RF carrier due to supply ripple; meets −60 dBc adjacent channel leakage ratio (ACLR) requirements in PCS transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7705QPWRQ1 | Single 5 V LDO with reset supervisor only; no LED driver, op-amp, or multi-LDO integration. | Suitable for basic reset generation in automotive body controllers, not for handset PMIC replacement. | Select only if system requires only reset supervision and a single LDO - lacks sequencing, backlight, and analog functions of LP3927ILQX-AZ/NOPB. |
| TPS65132A1YFFR | Three-output PMIC (dual LDO + boost) with I²C interface; no integrated op-amp or programmable LED sink. | Targeted at LCD bias supply in portable displays; lacks KYBD/VEXT sequencing logic and PS_HOLD protocol. | Choose for I²C-configurable dual-rail systems needing boost capability; not drop-in for LP3927ILQX-AZ/NOPB's hardware-sequenced, standalone architecture. |
Compared with TLC7705QPWRQ1 and TPS65132A1YFFR, the LP3927ILQX-AZ/NOPB uniquely integrates five factory-programmed LDOs, hardware-based power sequencing, 150 mA LED driver, and rail-to-rail op-amp in a single 28-pin LLP - making it irreplaceable for legacy cellular handset designs requiring minimal external components and deterministic timing.
Availability
LP3927ILQX-AZ/NOPB is available at Aetrix Electronics and suitable for cellular handset manufacturing, portable terminal production, and single-cell Li⁺ system development requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LP3927ILQX-AZ/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 acquired National Semiconductor in 2011 and maintains its legacy analog portfolio. TI is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies.
The LP3927ILQX-AZ/NOPB belongs to TI's legacy portable power management IC family, designed specifically for 2G/3G cellular handsets requiring integrated sequencing, backlight control, and analog signal conditioning in ultra-compact form factors.
FAQ
What output voltages are factory-programmed for LP3927ILQX-AZ/NOPB?
The LP3927ILQX-AZ/NOPB is configured with VO1 = 1.85 V, VO2 = 3.00 V, VO3 = 3.00 V, VO4 = 3.00 V, and VO5 = 3.00 V per National Semiconductor's ordering table. These values are laser-trimmed during wafer sort and cannot be modified in-circuit. The LP3927ILQX-AZ/NOPB does not support dynamic voltage scaling or I²C reconfiguration - all outputs are fixed at power-on.
How does the LP3927ILQX-AZ/NOPB handle power-down sequencing?
When PS_HOLD goes low, the LP3927ILQX-AZ/NOPB asserts RST after a brief delay, disables LDO2 after 20 ms, then disables LDO1 after 125 µs (standard delay). LDO3–LDO5 remain enabled until their respective EN pins are deasserted externally. This reverse-ordered shutdown prevents brownout in downstream circuits and ensures orderly processor reset before rail collapse.
Can the integrated op-amp in LP3927ILQX-AZ/NOPB drive capacitive loads?
The LP3927ILQX-AZ/NOPB op-amp is specified for RLOAD > 1 MΩ and is not characterized for direct capacitive loading. Driving >100 pF requires external isolation (e.g., series resistor) to avoid instability. For battery voltage monitoring, use a 100 kΩ/100 kΩ resistive divider into the op-amp's IN+ pin - the LP3927ILQX-AZ/NOPB's 1 GΩ input resistance ensures negligible loading error.
What is the maximum allowable LED current and how is it set on LP3927ILQX-AZ/NOPB?
The LP3927ILQX-AZ/NOPB supports up to 150 mA LED current, set by an external resistor on LED_PGM. With a 130 kΩ resistor, ILED = 150 mA (±15 mA over temperature). Lower resistance increases current linearly (e.g., 65 kΩ ≈ 300 mA), but exceeds absolute maximum ratings - the LP3927ILQX-AZ/NOPB's internal FET limits safe operation to 150 mA.
Is LP3927ILQX-AZ/NOPB pin-compatible with other variants in the LP3927 family?
Yes - all LP3927 variants (e.g., LP3927ILQX-AH, LP3927ILQX-AP) share identical 28-pin LLP pinout and footprint. Voltage options and LDO delay configuration differ per top marking, but electrical connections, thermal pad layout, and enable/control signal assignments are fully consistent across the family. PCBs designed for LP3927ILQX-AZ/NOPB support drop-in replacement with other LP3927 variants.
LP3927ILQX-AZ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Handheld/Mobile Devices
- Current - Supply:
- 5µA
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-WQFN (5x5)
LP3927ILQX-AZ/NOPB FAQ
1.How can I place an order for LP3927ILQX-AZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3927ILQX-AZ/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 LP3927ILQX-AZ/NOPB reliable?
The price and inventory of LP3927ILQX-AZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3927ILQX-AZ/NOPB is usually 5 days.
3.What payment methods are accepted for LP3927ILQX-AZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3927ILQX-AZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3927ILQX-AZ/NOPB?
LP3927ILQX-AZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3927ILQX-AZ/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 LP3927ILQX-AZ/NOPB?
For technical support, including LP3927ILQX-AZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3927ILQX-AZ/NOPB requirements.
6.How does Aetrix verify that LP3927ILQX-AZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3927ILQX-AZ/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 LP3927ILQX-AZ/NOPB meets industry standards.
7.What is the process for return or replacement of LP3927ILQX-AZ/NOPB?
All LP3927ILQX-AZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3927ILQX-AZ/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 LP3927ILQX-AZ/NOPB part is unused and in its original packaging.
Return procedure for LP3927ILQX-AZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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