The TPS7H4002-SP is a Radiation Hardened (RHA), 3V to 5.5V Input, 3A, Synchronous Buck Converter

The TPS7H4002-SP is a radiation hardened 5.5V, 3A synchronous buck converter optimized for small designs with high efficiency and integrated high-side and low-side MOSFETs. Further space savings are achieved through current-mode control that reduces component count and high switching frequency that reduces the inductor footprint.

The output voltage start-up ramp is controlled by the SS/TR pin, allowing operation as a standalone supply or in a tracking condition. Power sequencing can also be achieved by properly configuring the enable and open-drain power good pins. Additionally, the TPS7H4002-SP can be configured in primary-secondary mode for parallel operation.

Cycle-by-cycle current limit on the high-side FET protects the device during overload conditions and is enhanced by low-side source current limit to prevent current runaway. There is also a low-side sink current limit that turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part when the ADM2490EBRWZ die temperature exceeds the thermal limit.


●Radiation performance:

— Radiation hardness guaranteed up to TID 100 krad(Si)

- SEL, SEB and SEGR immunity to LET = 75 MeV-cm 2 /mg

—SET and SEFI characterization up to LET = 75 MeV-cm 2 /mg

●Peak efficiency: 96.9% (V = 2.5 V)

●Integrated 50-mΩ and 35-mΩ MOSFETs

Power Rail: 3 to 5.5 V on VIN

●3A maximum output current

●Flexible switching frequency options:

—100kHz to 1MHz adjustable internal oscillator

— External synchronization capability: 100 kHz to 1 MHz

—SYNC pin configurable as 500-kHz output for primary-secondary applications

0.807-V ±1.5% reference voltage varies with temperature, radiation, and line and load regulation

● Monotonic startup to pre-biased output

●Adjustable soft-start by external capacitor

Input enable and power good output for power sequencing

Power good output monitor for undervoltage and overvoltage

●Adjustable input undervoltage lockout (UVLO)

20-pin subminiature thermally enhanced ceramic flat pack (HKH) for space applications


Vin (Min) (V): 3

Vin (max) (V): 5.5

Vout (Min) (V): 0.604

Output Voltage (Max) (V): 5.3

Iout (Max) (A): 3

IQ (typ.) (uA): 2500

Switching Frequency (Min) (kHz): 100

Switching Frequency (Max) (kHz): 1000

Features: Enable, Frequency Synchronization, Over Current Protection, Power Good, Pre-bias Start-up, Soft-Start Adjustable, Synchronous Rectification, Tracking, UVLO Adjustable

Operating Temperature Range (°C): 25 to 25

Adjust output (#): 1