LMZ14203TZX-ADJ/NOPB – Complete Datasheet Summary

1. Basic Device Information

• Part Number: LMZ14203TZX-ADJ/NOPB
• Manufacturer: Texas Instruments
• Product Type: SIMPLE SWITCHER® 6–42V, 3A Step-Down Power Module
• Integrated: Shielded inductor, MOSFETs, controller, passives
• Package: 7‑Pin TO‑PMOD (NDW package)
• Body Size: 10.16 mm × 9.85 mm
• Packaging: Large tape‑and‑reel, 500 units per reel
• RoHS: Compliant (NOPB = lead‑free)
• Moisture Sensitivity: MSL 3 (168 hr, 245°C peak reflow)
• Operating Junction Temp: −40°C to +125°C
• Control Scheme: Constant On‑Time (COT)
• Document: SNVS632S (Rev S, July 2017)

2. Key Features

• Wide input voltage: 6 V to 42 V
• Adjustable output: 0.8 V to 6 V
• Rated output current: 3 A
• Up to 90% efficiency
• Integrated shielded inductor for low EMI
• Meets EN55022 Class B radiated emissions
• Precision enable with programmable UVLO
• Adjustable soft‑start
• Internal protection: OVP, OCP, UVLO, thermal shutdown
• Prebiased start‑up capability
• Minimal external components: 3 resistors + 4 capacitors
• Pin‑to‑pin compatible with LMZ14201/202 family

3. Electrical Specifications

表格

4. Absolute Maximum Ratings

• VIN, RON to GND: −0.3 V to +43.5 V
• EN, FB, SS to GND: −0.3 V to +7 V
• Junction Temperature: 150°C
• Storage Temperature: −65°C to +150°C
• Peak Reflow Temperature: 245°C
• ESD (HBM): ±2000 V

5. Thermal Data

• RθJA (4‑layer PCB): 19.3°C/W
• RθJA (2‑layer PCB): 21.5°C/W
• RθJC (top): 1.9°C/W
• Exposed pad must be soldered to GND for thermal performance

6. Pin Configuration (7‑Pin TO‑PMOD, Top View)

表格

7. Functional Description

• COT Control: Fast transient response; no external compensation
• Current Mode: Cycle‑by‑cycle current limit
• DCM/CCM Operation: Light load DCM for high efficiency; heavy load CCM
• OVP: FB > 0.92 V clamps output
• Thermal Shutdown: Activates at 165°C; releases at ~145°C
• Soft‑Start: 8 µA current source charges CSS to control ramp rate
• Zero Current Detect: Prevents reverse inductor current in DCM

8. External Component Design

Output Voltage Set

VOUT = 0.8 V × (1 + RFBT / RFBB)

• RFBT = top feedback resistor
• RFBB = bottom feedback resistor
• Feedforward capacitor CFF parallel with RFBT improves transient response

Switching Frequency

RON resistor programs fSW up to 1 MHz

tON(min) = 150 ns; tOFF(min) = 260 ns

Soft‑Start

tSS = (0.8 V × CSS) / 8 µA

• Recommended CSS ≥ 22 nF (tSS ≥ 2.2 ms)

Input/Output Capacitors

• CIN: ≥10 µF X7R, low ESR, close to VIN
• COUT: ≥10 µF X7R; 100 µF recommended for 3A loads

9. Recommended Operating Conditions

• VIN: 6 V to 42 V
• IOUT: 0 A to 3 A
• TA: −40°C to +105°C (ambient)
• TJ: −40°C to +125°C (junction)

10. Typical Applications

• 12V / 24V / 36V Industrial Point‑of‑Load
• Automotive and factory automation
• Test and measurement equipment
• Space‑constrained high‑thermal systems
• Negative output voltage designs (AN‑2027)
• FPGA/ASIC/MCU power supplies

11. Layout Guidelines

• Exposed pad soldered to GND plane with thermal vias
• CIN placed extremely close to VIN–GND
• Minimize high di/dt loop area
• Feedback resistors close to FB pin; away from SW noise
• Wide VIN/VOUT traces; dedicated ground for analog signals

12. Ordering & Packaging

• LMZ14203TZX‑ADJ/NOPB: 7‑pin TO‑PMOD, 500/tape‑and‑reel, −40 to 125°C
• Marking: LMZ14203 TZ‑ADJ
• Reel: 500 units, diameter 330 mm, width 24.4 mm
• Pin‑1 quadrant: Q2