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TPSM843321
  • TPSM843321
  • TPSM843321

TPSM843321

ACTIVE

3.8V to 18V input, 3A, 200kHz to 2.2MHz synchronous step-down power module

Texas Instruments TPSM843321 Product Info

1 April 2026 4

Parameters

Rating

Catalog

Topology

Buck

Iout (max) (A)

3

Vin (max) (V)

18

Vin (min) (V)

3.8

Vout (max) (V)

12

Vout (min) (V)

0.6

Features

Adjustable soft start, Adjustable switching frequency, Enable, External Sync, Light-load efficiency, Low Quiescent Current, Phase Interleaving, UVLO adjustable

Operating temperature range (°C)

-40 to 125

Type

Module

Duty cycle (max) (%)

98

Control mode

current mode

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

2200

Package

— (—)-—-See data sheet

Features

  • Configured for a wide range of applications
    • 3.8V to 18V input voltage range
    • 0.6V to 12V output voltage range
    • Up to 3A continuous output current
    • 0.6V ±1% reference voltage (–40°C to 125°C)
    • Low quiescent current of 28uA (typical)
    • 70ns, 114ns minimum switching on, off-time
    • 8us maximum switching on-time
    • 98% maximum duty cycle
  • Ease of use and small design size
    • Peak current control mode with internal compensation
    • 200kHz to 2.2MHz selectable frequency
    • Synchronizable to an external clock (support phase shift): 200kHz to 2.2MHz
    • Selectable PFM / FCCM at light load condition
    • Selectable adjustable soft-start time / power-good indicator function
    • Good EMI performance with frequency spread spectrum and optimized pinout
    • Hiccup overcurrent (OC) limit for both high-side and low-side MOSFETs
    • Non-latched protections for overtemperature protection (OTP), overcurrent protection (OCP), overvoltage protection (OVP), undervoltage protection (UVP), and undervoltage lockout (UVLO)
    • Integrated bootstrap capacitor and inductor to support easy PCB layout
    • Operating junction temperature of –40°C to 125°C
    • 3.3mm × 4.5mm × 2mm QFN package
  • Create a custom design with the TPSM843321 using the WEBENCH Power Designer
  • Configured for a wide range of applications
    • 3.8V to 18V input voltage range
    • 0.6V to 12V output voltage range
    • Up to 3A continuous output current
    • 0.6V ±1% reference voltage (–40°C to 125°C)
    • Low quiescent current of 28uA (typical)
    • 70ns, 114ns minimum switching on, off-time
    • 8us maximum switching on-time
    • 98% maximum duty cycle
  • Ease of use and small design size
    • Peak current control mode with internal compensation
    • 200kHz to 2.2MHz selectable frequency
    • Synchronizable to an external clock (support phase shift): 200kHz to 2.2MHz
    • Selectable PFM / FCCM at light load condition
    • Selectable adjustable soft-start time / power-good indicator function
    • Good EMI performance with frequency spread spectrum and optimized pinout
    • Hiccup overcurrent (OC) limit for both high-side and low-side MOSFETs
    • Non-latched protections for overtemperature protection (OTP), overcurrent protection (OCP), overvoltage protection (OVP), undervoltage protection (UVP), and undervoltage lockout (UVLO)
    • Integrated bootstrap capacitor and inductor to support easy PCB layout
    • Operating junction temperature of –40°C to 125°C
    • 3.3mm × 4.5mm × 2mm QFN package
  • Create a custom design with the TPSM843321 using the WEBENCH Power Designer

Description

The TPSM843321 is a high-efficiency, high-power density, and easy-to-use, synchronous buck power module with high design flexibility. With operating input voltage ranging from 3.8V to 18V, the TPSM843321 is designed for systems powered from 5V, 12V power-bus rails. The device supports up to 3A continuous output current and 98% maximum duty cycle.

TPSM843321 uses fixed frequency peak current control with internal compensation for fast transient response and good line and load regulation. With the optimized internal loop compensation, the device eliminates the need for external compensation over a wide output voltage range and switching frequency.

TPSM843321 allows high design flexibility with wide supported switching frequency of 200kHz – 2.2MHz set by the RT/SYNC pin. The device has the option for pulse frequency modulation (PFM), forced continuous conduction modulation (FCCM) at light load condition, and adjustable soft-start (SS) time / power-good (PG) indicator with different configuration of the MODE pin.

TPSM843321 provides protection functions including thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. TPSM843321 is available in a 9-pin, 3.3mm × 4.5mm, QFN package, and the pinout is available for single-layer PCB layout. The junction temperature is specified from –40°C to 125°C.

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