Overview
Description
The ISL70005SEH 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. They are 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 ISL70005SEH 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.
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 EN, SS, and PG indicators
- ±1% reference voltage
- 1A current sourcing/sinking capability on LDO
- 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
- HDR (50-300rad(Si)/s): 100krad(Si)
- 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
Comparison
Applications
Design & Development
Software & Tools
Boards & Kits
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Support
Support Communities
Get quick technical support online from Renesas Engineering Community technical staff.
FAQs
-
Is it correct that the ISL70005SEH LDO output voltage is not within regulation during an over-current condition?
Question: Is it correct that the LDO output voltage is not within regulation during an over-current condition? Answer: Yes. During an over-current condition the LDO regulates the current to ensure that current doesn’t exceed the limit of 1.25A minimum to 2A maximum, during sinking or sourcing ...
Jan 1, 1970 -
ISL70005SEH - must both the LDO and buck portions be active during operation?
Question: Must both the LDO and buck portions be active during operation? Answer: No, the LDO and the buck are independent each having its own EN, PG and SS pins for control. This allows the user either use both function independently; however, both L_VCC and B_VCC pins need ...
Jan 1, 1970 -
How is tracking achieved on the ISL70005SEH LDO for DDR memory power solutions?
Question: How is tracking achieved on the LDO for DDR memory power solutions? Answer: The non-inverting input to the LDO’s error amplifier is pinned out on pin L_EA+. Connect the midpoint of an equal R/R resistor divider from the VDDQ rail to the L_EA ...
Jan 1, 1970