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LM43603PWPR
Texas Instruments
IC REG BUCK ADJ 3A 16HTSSOP
29492 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 3A 16-PowerTSSOP (0.173", 4.40mm Width)
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5.0 / 5.0
- (237 Ratings)
LM43603PWPR
Product Overview
1294273
DiGi Electronics Part Number
LM43603PWPR-DGManufacturer
Texas Instruments
LM43603PWPR
Description
IC REG BUCK ADJ 3A 16HTSSOPInventory
29492 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 3A 16-PowerTSSOP (0.173", 4.40mm Width)
Quantity
Minimum 1
Minimum 1
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LM43603PWPR Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
3.5V
Voltage - Input (Max)
36V
Voltage - Output (Min/Fixed)
1V
Voltage - Output (Max)
28V
Current - Output
3A
Frequency - Switching
200kHz ~ 2.2MHz
Synchronous Rectifier
Yes
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
16-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package
16-HTSSOP
Base Product Number
LM43603
Datasheet & Documents
Manufacturer Product Page
LM43603PWP Specifications
HTML Datasheet
LM43603PWPR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-44477-1
296-44477-2
296-44477-6
Standard Package
2,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key thermal and layout considerations when designing a high-current buck converter with the LM43603PWPR to avoid overheating in compact PCB designs?
When using the LM43603PWPR in high-current or space-constrained applications, proper thermal management is critical due to its 16-HTSSOP package with limited thermal dissipation. Ensure a solid ground plane beneath the device and connect the exposed thermal pad directly to this plane using multiple vias to improve heat transfer. Keep high-di/dt switching loops (input capacitor, SW pin, inductor) as short as possible to reduce EMI and switching losses. Avoid placing heat-sensitive components near the LM43603PWPR, and consider airflow or copper pour extensions if operating near 3A continuously at high ambient temperatures. Poor layout can lead to thermal runaway or reduced efficiency, especially when input voltage exceeds 24V.
Can the LM43603PWPR safely replace a non-synchronous buck regulator like the LM2596 in a 24V-to-5V, 2A industrial application, and what design changes are required?
Yes, the LM43603PWPR can replace the LM2596 in a 24V-to-5V, 2A design, but several modifications are necessary. Unlike the LM2596, the LM43603PWPR is a synchronous buck regulator with higher efficiency and requires different compensation network design due to its internal control loop. You must remove the external diode and replace it with a low-ESR ceramic output capacitor. Additionally, the feedback resistor network must be recalculated for the desired 5V output (using the 1V reference), and input capacitance should be upgraded to handle higher ripple current. Also, ensure your PCB supports the 16-HTSSOP package and thermal pad, which the TO-220-based LM2596 does not require.
How does the LM43603PWPR compare to the newer LM43602 in terms of performance and suitability for 3A output applications, and when should I choose one over the other?
The LM43603PWPR and LM43602 are nearly identical except for maximum output current—3A vs. 2A—making the LM43603PWPR the better choice for loads requiring up to 3A continuous current. Both share the same pinout, package (16-HTSSOP), and control architecture, so migration between them is straightforward. However, if your design operates near 2.5A with margin, the LM43603PWPR provides better thermal headroom and reliability. Choose the LM43602 only if cost or inventory constraints exist and your load is strictly below 2A. For future-proofing or dynamic loads, the LM43603PWPR is the safer engineering decision despite minimal price difference.
What input voltage transients or noise conditions could cause instability or damage to the LM43603PWPR in automotive or industrial environments, and how can they be mitigated?
The LM43603PWPR can be vulnerable to voltage spikes above 36V (its absolute maximum input rating) common in automotive load dump or inductive load switching scenarios. Sustained overvoltage can damage the internal MOSFETs or control circuitry. To protect the LM43603PWPR, use a TVS diode rated for 33–36V clamping voltage at the input, along with a bulk electrolytic capacitor (e.g., 47µF) in parallel with low-ESR ceramics to absorb transient energy. Additionally, an LC filter or ferrite bead at the input can suppress high-frequency noise. Always verify transient suppression in system-level testing, especially if the LM43603PWPR is powered directly from vehicle batteries or long cable runs.
Is the LM43603PWPR suitable for battery-powered applications with wide input voltage ranges, such as 12V lead-acid systems that can drop to 6V during cranking?
The LM43603PWPR is not ideal for applications where input voltage drops below 3.5V, such as during cold cranking in 12V automotive systems that can dip to 6V or lower. While it operates down to 3.5V, performance degrades near this threshold, and startup may fail if the input falls below the UVLO (undervoltage lockout) level. For such scenarios, consider a buck-boost converter like the TPS63020 or use a pre-regulator to maintain stable input above 4V. If your system guarantees input stays above 4V under all conditions, the LM43603PWPR can work efficiently—but validate behavior at minimum input voltage with full load to avoid unexpected shutdowns or instability.
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LM43603PWPR CAD Models
Texas Instruments LM43603PWPR PCB symbols & footprints
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