| Vin (Min) (V) | 3 |
| Vin (Max) (V) | 5.5 |
| Vout (Min) (V) | 0.804 |
| Vout (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 |
| Rating | Space |
| Regulated outputs (#) | 1 |
| Control mode | Current Mode |
| Duty cycle (Max) (%) | 100 |
- Radiation performance:
- Radiation-hardness-assured up to TID 100 krad(Si)
- SEL, SEB, and SEGR immune to LET = 75 MeV-cm2/mg
- SET and SEFI characterized up to LET = 75 MeV-cm2/mg
- Peak efficiency: 96.9% (VO = 2.5 V)
- Integrated 50-m? and 35-m? MOSFETs
- Power rail: 3 to 5.5 V on VIN
- 3-A maximum output current
- Flexible switching frequency options:
- 100-kHz to 1-MHz adjustable internal oscillator
- External sync capability: 100 kHz to 1 MHz
- SYNC pin can be configured as a 500-kHz output for primary-secondary applications
- 0.807-V ±1.5% voltage reference over temperature, radiation, and line and load regulation
- Monotonic start-up into prebiased outputs
- Adjustable soft start through 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 ultra-small, thermally-enhanced ceramic flatpack package (HKH) for space applications
The TPS7H4002-SP is a radiation hardened, 5.5-V, 3-A synchronous step-down converter, which is optimized for small designs through high efficiency and by integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and a high switching frequency, which reduces the inductor footprint.
The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins. In addition, the TPS7H4002-SP can be configured in primary-secondary mode for parallel operation.
Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part when die temperature exceeds thermal limit.
