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Texas Instruments LM3204TL/NOPB
- Part No.:
- LM3204TL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFBGA
- Datasheet:
-
LM3204TL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 10DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3204TL/NOPB from Texas Instruments is a step-down DC-DC converter optimized for powering RF power amplifiers (PAs) in mobile phones and portable RF devices from a single Li-ion cell. It delivers adjustable output voltage from 0.6 V to 3.6 V, supports up to 1.5 A load current in PWM mode, operates at 2.5 MHz switching frequency, and features integrated bypass FETs for high-efficiency battery-powered PA biasing.
For engineers reviewing the LM3204TL/NOPB datasheet, LM3204TL/NOPB pinout, LM3204TL/NOPB application, or LM3204TL/NOPB equivalent, key selection criteria include dynamic output voltage adjustment via analog control pin, seamless transition between PWM and bypass modes, thermal shutdown protection, and compatibility with ultra-small external components - critical for space-constrained cellular front-end modules.
Technical Context
The LM3204TL/NOPB implements a synchronous buck topology with integrated high-side and low-side MOSFETs, using pulse-width modulation (PWM) for regulated operation and a dedicated bypass FET for direct battery-to-PA conduction. Its control loop dynamically adjusts duty cycle based on feedback from the analog control pin (VCTRL), enabling real-time PA supply voltage tuning without external DAC or digital interface.
It supports three distinct operating modes: PWM mode for precise regulation across wide load ranges, forced bypass mode (via BYPASS pin high), and auto-bypass mode that engages when input-output differential drops below ~120 mV. Internal synchronous rectification and 2.5 MHz switching minimize inductor size and reduce EMI sensitivity in RF-sensitive layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.5 MHz typical - enables use of sub-1 µH inductors and reduces PCB area in compact RF modules. |
| Output Voltage Range | 0.6 V to 3.6 V - programmable via analog VCTRL pin, eliminating need for external feedback resistors or DAC. |
| Max Output Current (PWM) | 1.5 A - sufficient for mid-power LTE/WCDMA PAs; limited by internal MOSFET RDS(on) and thermal design. |
| Max Output Current (Bypass) | 2.5 A - higher current capability in direct battery conduction mode, supporting peak PA burst demands. |
| Quiescent Current | 25 µA typical in shutdown - extends battery life during idle periods in always-on mobile devices. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion (2.8–4.2 V) and USB-powered test configurations. |
| Thermal Shutdown Threshold | 150 °C junction - protects device during sustained high-load or poor PCB thermal relief conditions. |
Pinout & Package
LM3204TL/NOPB is housed in a 12-pin, 2.0 mm × 2.0 mm × 0.65 mm micro leadframe package (MLP) with wettable flank terminations for automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Connects to battery or DC source; requires local 1-µF ceramic decoupling capacitor. |
| 2 (GND) | Power Ground | Main return path for high-current switching loop; must be low-inductance connection to ground plane. |
| 3 (SW) | Switch Node | Drives external inductor; high dv/dt node requiring tight layout and minimal trace length. |
| 4 (FB) | Feedback Input | Not used in standard configuration; tied to VOUT when VCTRL sets output voltage. |
| 5 (VCTRL) | Analog Control Input | 0.6–1.8 V input sets output voltage linearly (VOUT = 0.6 + 1.67 × VCTRL); no external resistor divider needed. |
| 6 (BYPASS) | Mode Selection | High = forced bypass mode; low or floating = auto-bypass/PWM mode; controls internal bypass FET gate. |
| 7 (EN) | Enable Input | Active-high logic; pulls device into shutdown (IQ < 1 µA) when low. |
| 8 (PGND) | Power Ground | Dedicated ground for high-current paths; must be connected to GND pin (2) with short, wide copper pour. |
| 9 (VOUT) | Regulated Output | Delivers controlled PA supply; connects directly to PA VCC pin and local 4.7-µF ceramic output capacitor. |
| 10 (GND) | Signal Ground | Reference for EN, BYPASS, and VCTRL; should be star-connected to PGND near IC. |
| 11 (VSENSE) | Output Sensing | Optional remote sense; tied to VOUT in standard layout to compensate for IR drop in high-current traces. |
| 12 (GND) | Power Ground | Third GND pad for thermal and current handling; must be soldered to exposed thermal pad on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 2.5 MHz fixed-frequency PWM | Enables use of 0.47 µH inductor and small 1206/0805 passives, reducing solution footprint by >40% vs. 500 kHz converters. |
| Voltage-programmable output (0.6–3.6 V) | Eliminates external feedback network and allows dynamic PA efficiency optimization across transmit power levels. |
| Integrated bypass FET with auto-switching | Reduces dropout voltage to <120 mV, improving PA efficiency at high output power where VIN ≈ VOUT. |
| Thermal and overcurrent protection | Prevents latch-up during transient overload or board-level thermal failure; auto-recovery after cooldown. |
| Ultra-small MLP-12 package (2.0 × 2.0 mm) | Supports HDI PCB designs in smartphone antenna submodules where height (<0.65 mm) and area are constrained. |
Applications
| Cellular Handset Front-End | WCDMA/LTE Power Amplifier Bias |
|---|---|
Use Scenario: Dynamic supply voltage control for multi-band LTE power amplifier in a slim smartphone. IC Role / Device Role / Timing Role: Step-down regulator providing variable VCC_PA synchronized to PA gain state transitions. Use Value: Enables Envelope Tracking-like efficiency without complex ET modulator; achieves >85% PA system efficiency at mid-power levels. | Use Scenario: Compact RF module powering WCDMA Band I/V/VI PAs from shared battery rail. IC Role / Device Role / Timing Role: Primary PA supply with fast load transient response (<5 µs to settle ±2%) and low output ripple (<10 mVpp). Use Value: Maintains PA linearity during rapid power ramp-up/down; eliminates need for discrete LDO post-regulation. |
| Portable IoT Cellular Modem | RF Test Equipment Bias Supply |
Use Scenario: Low-power NB-IoT or Cat-M1 modem requiring long battery life and minimal BOM count. IC Role / Device Role / Timing Role: Efficient PA supply with 25 µA quiescent current and automatic shutdown during sleep cycles. Use Value: Extends battery runtime beyond 10 years in metering applications; supports deep-sleep wake-up in <100 µs. | Use Scenario: Lab-grade RF signal generator needing stable, low-noise PA bias under varying temperature and load. IC Role / Device Role / Timing Role: Precision-adjustable bench supply with analog VCTRL interface and thermal derating flag. Use Value: Replaces bulky bench PSUs; provides repeatable VOUT accuracy of ±1.5% over –20°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF power amplifier supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3243TL/NOPB | Higher 3.5 A bypass current rating; adds I2C interface for digital voltage control and telemetry. | Targeted at flagship smartphones with multi-PA arrays and closed-loop envelope tracking systems. | Select when digital configurability, higher current headroom, or telemetry (die temperature, output current) is required. |
| MAX1968ETA+ | Charge-pump-based architecture; no inductor required but limited to 1.2 A max output and fixed 2.85 V output. | Suitable for legacy GSM/GPRS PAs where simplicity and cost outweigh efficiency and flexibility needs. | Select only for cost-sensitive, low-current, fixed-voltage applications where inductor elimination is mandatory. |
Compared with LM3243TL/NOPB, the LM3204TL/NOPB offers lower solution cost and smaller footprint due to absence of I²C circuitry and smaller inductor, while retaining analog programmability essential for analog envelope tracking. Against MAX1968ETA+, it delivers superior efficiency (>90% vs. ~82%), wider output range, and true dynamic adjustment - critical for modern wideband PA architectures.
Availability
LM3204TL/NOPB is available at Aetrix Electronics and suitable for cellular handset front-end modules, portable IoT modems, and RF test equipment requiring stable component supply, consistent parametric performance, and long-term production availability.
Supply support for LM3204TL/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 and embedded processing technologies, with decades of RF power management innovation.
The LM3204TL/NOPB belongs to TI's RF Power Amplifier Supply family, designed specifically to replace discrete buck + LDO solutions in space- and efficiency-critical mobile RF front-ends.
FAQ
What is the primary function of the LM3204TL/NOPB in an RF power amplifier system?
The LM3204TL/NOPB serves as a highly efficient, dynamically adjustable step-down DC-DC converter that supplies bias voltage to RF power amplifiers in mobile handsets and portable transceivers. It replaces traditional LDO-based solutions by delivering higher efficiency-especially at high output currents-and enables real-time output voltage tuning via its analog VCTRL pin, optimizing PA efficiency across varying transmit power levels without requiring digital control infrastructure. This makes the LM3204TL/NOPB ideal for LTE/WCDMA front-end modules where battery life and thermal management are critical.
How does the LM3204TL/NOPB switch between PWM and bypass modes?
The LM3204TL/NOPB automatically transitions between PWM regulation and bypass conduction based on the input-output voltage differential. When VIN − VOUT falls below approximately 120 mV, the internal bypass FET turns on, connecting the input directly to the output with minimal dropout. This transition is seamless and occurs without external intervention. The BYPASS pin can also force bypass mode (logic high) or enable auto-mode (logic low or floating). In bypass mode, the LM3204TL/NOPB supports up to 2.5 A continuous current, significantly exceeding its 1.5 A PWM limit, making it suitable for PA peak power bursts.
Can the LM3204TL/NOPB operate with a 2.7 V input from a partially discharged Li-ion cell?
Yes, the LM3204TL/NOPB supports an input voltage range of 2.7 V to 5.5 V, making it fully compatible with the full discharge curve of a single-cell Li-ion battery (2.8 V–4.2 V). At 2.7 V input, it can still regulate down to its minimum output voltage of 0.6 V in PWM mode, and will enter bypass mode if the programmed VOUT is within ~120 mV of VIN. For example, with VCTRL set to 0.6 V (yielding VOUT = 0.6 V), the device remains in PWM mode even at 2.7 V input. Its low quiescent current (25 µA) further ensures minimal battery drain during standby.
What external components are required for basic LM3204TL/NOPB operation?
A minimum viable LM3204TL/NOPB design requires only three external components: a 0.47 µH shielded power inductor (saturation current ≥2.5 A), a 4.7 µF X5R/X7R ceramic output capacitor (rated ≥6.3 V), and a 1 µF ceramic input capacitor (rated ≥6.3 V) placed close to VIN and GND pins. The VCTRL pin may be driven directly from a DAC or baseband processor GPIO; no feedback resistors are needed. Optional components include a remote sense trace (VSENSE), thermal pad grounding, and a 100 kΩ pull-down on BYPASS for default auto-mode behavior.
Does the LM3204TL/NOPB include protection features for harsh mobile environments?
Yes, the LM3204TL/NOPB integrates multiple robust protection mechanisms: thermal shutdown triggers at ~150 °C junction temperature and auto-recovers upon cooling; overcurrent protection limits peak inductor current to prevent damage during short-circuit or overload events; and output overvoltage protection (OVP) activates if VOUT exceeds ~4.2 V, disabling the high-side switch. Additionally, its 2.5 MHz switching frequency inherently reduces susceptibility to RF interference, and the MLP-12 package's wettable flanks support reliable AOI inspection-critical for high-yield mobile manufacturing.
LM3204TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 3.6V
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DSBGA
LM3204TL/NOPB FAQ
1.How can I place an order for LM3204TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3204TL/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 LM3204TL/NOPB reliable?
The price and inventory of LM3204TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3204TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM3204TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3204TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3204TL/NOPB?
LM3204TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3204TL/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 LM3204TL/NOPB?
For technical support, including LM3204TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3204TL/NOPB requirements.
6.How does Aetrix verify that LM3204TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3204TL/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 LM3204TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM3204TL/NOPB?
All LM3204TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3204TL/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 LM3204TL/NOPB part is unused and in its original packaging.
Return procedure for LM3204TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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