Features
- Electrically screened to DLA SMD 5962-19209
- Dual-output regulator: 3A synchronous buck and ±1A LDO
- DDR, DDR2, DDR3, and DDR4 VDDQ/VTT regulator
- Independent Enable (EN), soft-start (SS), and Power-Good (PG) indicators
- ±1% reference voltage
- External clock synchronization: 100kHz to 1MHz
- Full military temperature range operation
- TA = -55°C to +125°C
- TJ = -55°C to +150°C
- TID Rad Hard Assurance (RHA) testing
- LDR (0.01rad(Si)/s): 75krad(Si)
- SEE hardness (see test report)
- No DSEE with VDD = 6.0V at LET 86.4MeV•cm2/mg
- No SEFI at LET 43MeV•cm2/mg
Description
The ISL73005SEH is radiation hardened dual-output point-of-load (POL) regulator combining the high efficiency of a synchronous buck regulator with the low noise of a low-dropout (LDO) regulator. It is suited for systems with 3.3V or 5V power buses and can support continuous output load currents of 3A for the buck regulator and ±1A for the LDO. The buck regulator uses a voltage mode control architecture and switches at a resistor-adjustable frequency of 100kHz to 1MHz. Externally adjustable loop compensation allows for an optimum balance between stability and output dynamic performance. The internal synchronous power switches are optimized for high efficiency and excellent thermal performance. The LDO is completely configurable, independent of the switching regulator. It uses NMOS pass devices and separate chip bias voltage (L_VCC) to drive its gate, enabling the LDO to operate with a very-low voltage at the L_VIN input. The LDO can sink and source up to 1A continuously, making it an ideal choice to power DDR memory. The ISL73005SEH is available in a space-saving 28 Ld ceramic dual flat-pack package or in die form. It is specified to operate across a temperature range of TA = -55°C to +125°C.
Parameters
| Attributes | Value |
|---|---|
| Rating | Space |
| Control Mode | Voltage Mode |
| IOUT Rail 1 (max) (A) | 3 |
| IOUT Rail 2 (max) (A) | 1 |
| No-Load Operating Current | 10 mA |
| Outputs (#) | 2 |
| Quiescent Current | 0.6mA |
| Supply Voltage Rail 1 (min) (V) | 3 |
| Supply Voltage Rail 1 (max) (V) | 5.5 |
| Supply Voltage Rail 2 (min) (V) | 1 |
| Supply Voltage Rail 2 (max) (V) | 5.5 |
| Switching Frequency (min) (kHz) | 100 |
| Switching Frequency (max) (kHz) | 1000 |
| VOUT Rail 1 (min) (V) | 0.6 |
| VOUT Rail 1 (max) (V) | 4.675 |
| VOUT Rail 2 (min) (V) | 0.6 |
| VOUT Rail 2 (max) (V) | 5 |
| Temp. Range (°C) | -40 to +125°C, -55 to +125°C |
| TID LDR (krad(Si)) | 75 |
| DSEE (MeV·cm2/mg) | 86 |
| Flow | RH Hermetic |
| Qualification Level | Class V |
| Die Sale Availability? | Yes |
| PROTO Availability? | Yes |
Application Block Diagrams
 | Radiation Hardened Versal Power Tree A radiation hardened power supply for satellite applications using AMD Versal. |
Additional Applications
- Point-of-load for low-power FPGA cores
- Auxiliary and I/O supply voltages
- DDR memory power for VDDQ and VTT rails
- Distributed power system of satellite payloads
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Knowledge Base
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ISL70005SEH and ISL73005SEH TEST Pin
... this mode, it is very unlikely to occur due to noise from a floating pin during ground testing.It is not recommended to do this for flight applications, so this should be addressed in the flight units to ensure this pin is connected to analog ground. Suitable Products ISL70005SEH, ISL73005SEH
Mar 25, 2026
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