My Inquiry
My Account
Texas Instruments LM3253TME/NOPB
- Part No.:
- LM3253TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3253TME/NOPB.pdf
- Description:
- IC REG CONV RF PWR 1OUT 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3253TME/NOPB from Texas Instruments is a high-current synchronous step-down DC-DC converter optimized for powering 2G/3G/4G RF power amplifiers from a single Li-ion cell (2.7V–5.5V input). It delivers dynamically adjustable output voltage (0.4V–3.6V) with up to 3A load current in PWM mode, 2.7MHz switching frequency, and integrated Active Current assist & Analog Bypass (ACB) enabling low-dropout operation with 45 mΩ total dropout resistance.
For engineers reviewing the LM3253TME/NOPB datasheet, LM3253TME/NOPB pinout, LM3253TME/NOPB application, or LM3253TME/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed ACB behavior, real-world efficiency curves at 1A–3A loads, and precise PFM/PWM mode transition thresholds - all critical for RF PA power rail design in USB datacards and cellular handsets.
Technical Context
The LM3253TME/NOPB implements a constant-frequency PWM architecture with automatic PFM fallback below 75 mA load, enabling <93% efficiency at 250 mA (VOUT=2.5V) and >89% at 10 mA (VOUT=1.8V). Its ACB circuit activates at ~1.9A steady-state inductor current to supply supplemental current via parallel analog path, maintaining regulation while limiting peak inductor size.
It uses internal synchronous rectification with PFET/NFET switches, supports analog VCON-based output programming (2.5× gain), and features modulated switching frequency for Rx-band EMI compliance. Bypass mode is triggered either automatically (BP = LOW) or forced (BP = HIGH), with full 100% duty-cycle operation when dropout conditions exceed Rtot_drop = 45 mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full discharge curve of single Li-ion cell without external LDO pre-regulation. |
| Max Output Current (PWM) | 3.0A - sustained load capability with thermal shutdown protection at TJ = 150°C. |
| Output Voltage Range | 0.4V to 3.6V - dynamically set by 0.16V–1.44V analog VCON input with 2.5× gain. |
| Switching Frequency | 2.7 MHz (typ.) - enables use of 1.5 µH inductor and compact 0402/0201 MLCCs. |
| ACB Dropout Resistance | 45 mΩ (typ.) - enables analog bypass operation with minimal headroom loss under heavy load. |
| PFM Threshold Current | 75 mA (typ.) - automatic transition from PWM to PFM for ultra-low Iq (260 µA) at light loads. |
| Shutdown Current | 0.02 µA (typ.) - EN-controlled deep-sleep state for battery longevity in idle modes. |
Pinout & Package
LM3253TME/NOPB uses a 2 mm × 2 mm, 0.4 mm pitch, 16-bump Thin DSBGA package (YFQ) with bottom-side solder balls. Thermal pad is not exposed; BGND and PGND are separate high-current and signal ground terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1, C1, D1 | PGND / SGND / VDD | Power ground (A1), signal ground (B1/C1), analog supply (D1) - decoupling VDD with 1 µF near pin is mandatory. |
| A2, B2, C2, D2 | SW / EN / VCON / PVIN | Switch node (A2) connects to 1.5 µH inductor; EN (B2) has 800 kΩ pulldown; VCON (C2) sets VOUT = 2.5 × VCON; PVIN (D2) powers PFET and ACB. |
| A3, B3, C3, D3 | PVIN / BP / MODE / FB | Dual PVIN pins (A3/D3) reduce IR drop; BP (B3) forces bypass; MODE (C3) selects PFM/PWM auto-switch or PWM-only; FB (D3) closes regulation loop at output capacitor. |
| A4, B4, C4, D4 | ACB / BGND / BGND / FB | ACB (A4) connects directly to output filter capacitor anode; dual BGND (B4/C4) carry high-current ACB return; second FB (D4) improves noise immunity in layout. |
Key Features
| Feature | Design Value |
|---|---|
| Active Current Assist & Analog Bypass (ACB) | Supplies up to 1.7A additional current beyond 1.9A switcher limit, enabling 3A total with 1.5 µH inductor and eliminating need for oversized magnetics. |
| Dynamically Adjustable Output | VCON input (0.16V–1.44V) sets VOUT from 0.4V to 3.6V with ±3% linearity - matches 3GPP PA envelope tracking requirements. |
| Modulated Switching Frequency | Frequency shifts during load transients to suppress Rx-band emissions - meets ECTEL spectral mask for EDGE/GMSK without added shielding. |
| Analog Bypass Function | 45 mΩ dropout resistance allows direct PVIN-to-VOUT conduction below dropout, sustaining PA operation down to 2.7V input with no regulation loss. |
| Thermal & Current Protection | Internal thermal shutdown (150°C) and fixed current limits (ILIM,PFET = 1.9A steady, 2.5A transient) prevent damage during PA burst transmission. |
Applications
| Cellular Phone RF Power Amplifier | USB Datacard 3G/4G Modem |
|---|---|
Use Scenario: Powering multi-mode 2G/3G/4G PA in smartphone mainboard where battery voltage drops from 4.2V to 2.7V during discharge. IC Role / Device Role / Timing Role: Primary buck regulator delivering dynamically scaled VCC_PA per modulation standard, synchronized to baseband DAC output via VCON. Use Value: ACB maintains 3A delivery at 2.7V input with <50 mV ripple, avoiding PA gain collapse during EDGE transmit bursts. | Use Scenario: Compact USB dongle requiring high-efficiency PA supply within strict 20 mm × 10 mm PCB area budget. IC Role / Device Role / Timing Role: Single-chip PA power solution replacing discrete buck + LDO, with MODE pin enabling automatic PFM/PWM based on data throughput. Use Value: 2.7MHz switching allows 1.5 µH inductor and eliminates need for external ferrite beads - reduces BOM count by 4 components. |
| Hand-Held Radio Transmitter | Battery-Powered RF PC Card |
Use Scenario: Portable land-mobile radio operating across temperature range −30°C to +90°C with intermittent high-duty-cycle TX. IC Role / Device Role / Timing Role: High-reliability PA supply with thermal foldback and current limiting active during 100% duty cycle TX events. Use Value: Junction temperature monitoring and shutdown at 150°C prevents thermal runaway during extended field use in hot environments. | Use Scenario: Mini-PCIe RF card for IoT gateway requiring low-noise, fast-transient PA supply compatible with host CPU power sequencing. IC Role / Device Role / Timing Role: EN-controlled startup with 30 µs SW activation delay ensures clean power-up before baseband initialization. Use Value: 50 µs turn-on time (to 90% VOUT) aligns with PCIe enumeration timing, preventing link training failures. |
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 |
|---|---|---|---|
| TPS62590RRLR | 3A buck with 2.25MHz switching, no ACB; requires larger inductor (2.2 µH) for same 3A load; VOUT programmable only digitally (I²C). | Lacks analog VCON interface and ACB - unsuitable for envelope-tracking PA systems needing sub-µs VOUT slew. | Select when digital control and I²C telemetry are prioritized over analog envelope tracking. |
| TPS62260DDCR | 1.2A max output, 2.25MHz, no ACB or bypass mode; uses standard SOT-23-6 package; lower quiescent current (18 µA in shutdown). | Insufficient current for 3G/4G PA peak loads; cannot replace LM3253TME/NOPB in 3A applications without parallel staging. | Choose only for low-power 2G-only or auxiliary bias rails where 1.2A suffices. |
Compared with TPS62590RRLR and TPS62260DDCR, the LM3253TME/NOPB uniquely integrates analog VCON control, ACB current assist, and 45 mΩ bypass - enabling single-chip 3A RF PA supply in space-constrained mobile designs where dynamic voltage scaling and minimal dropout are mandatory.
Availability
LM3253TME/NOPB is available at Aetrix Electronics and suitable for USB datacards, cellular phones, hand-held radios, and battery-powered RF devices requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for LM3253TME/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 power management ICs, with decades of RF power system expertise.
The LM3253 product line was engineered specifically for multi-mode cellular RF power amplifier supply, addressing 3GPP envelope tracking, spectral mask compliance, and Li-ion battery discharge optimization in portable wireless infrastructure.
FAQ
What is the maximum continuous output current capability of the LM3253TME/NOPB?
The LM3253TME/NOPB delivers up to 3.0A continuous output current in PWM mode, verified under TA = 25°C with recommended 1.5 µH inductor and proper thermal layout. At higher ambient temperatures or with reduced airflow, derating applies per θJA = 50°C/W; thermal shutdown engages at TJ = 150°C to protect the LM3253TME/NOPB.
How does the Active Current Assist & Analog Bypass (ACB) function in the LM3253TME/NOPB?
The ACB circuit in the LM3253TME/NOPB activates when inductor current reaches ~1.9A, supplying supplemental current through a parallel analog path to sustain 3A total load. It also enables low-dropout operation with 45 mΩ total resistance, allowing seamless transition into analog bypass mode when input voltage approaches VOUT - a core feature distinguishing the LM3253TME/NOPB from standard buck converters.
Can the LM3253TME/NOPB operate from a fully discharged Li-ion cell?
Yes - the LM3253TME/NOPB operates across 2.7V to 5.5V input, covering the full discharge curve of a single Li-ion cell. Its ACB and analog bypass modes maintain regulation down to 2.7V input even at 3A load, with measured dropout resistance of 45 mΩ ensuring minimal headroom loss - a key specification validated in TI's SNVS791Q datasheet for the LM3253TME/NOPB.
What is the role of the MODE pin on the LM3253TME/NOPB?
The MODE pin on the LM3253TME/NOPB selects between two operational states: HIGH enables automatic PFM/PWM mode transition (for 3G/4G efficiency optimization), while LOW forces constant-frequency PWM mode (required for 2G GMSK spectral compliance). This dual-mode capability is intrinsic to the LM3253TME/NOPB's design for multi-standard RF PA support.
Does the LM3253TME/NOPB include built-in protection features?
Yes - the LM3253TME/NOPB integrates current limiting (1.9A steady-state, 2.5A transient), thermal shutdown (150°C trip, 130°C release), and undervoltage lockout managed externally via EN pin control. These protections are silicon-verified and documented in the absolute maximum ratings and system characteristics tables of the official LM3253TME/NOPB datasheet.
LM3253TME/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, RF Power Amplifier
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.4V ~ 3.6V
- Operating Temperature:
- -30°C ~ 90°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DSBGA
LM3253TME/NOPB FAQ
1.How can I place an order for LM3253TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3253TME/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 LM3253TME/NOPB reliable?
The price and inventory of LM3253TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3253TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM3253TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3253TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3253TME/NOPB?
LM3253TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3253TME/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 LM3253TME/NOPB?
For technical support, including LM3253TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3253TME/NOPB requirements.
6.How does Aetrix verify that LM3253TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3253TME/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 LM3253TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM3253TME/NOPB?
All LM3253TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3253TME/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 LM3253TME/NOPB part is unused and in its original packaging.
Return procedure for LM3253TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3253TME/NOPB Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
