DATASHEET
ISL75051ASEH, ISL73051ASEH
FN8964
Rev.3.00
3A, Radiation Hardened, Positive, Ultra-Low Dropout Regulator
May 16, 2019
The ISL75051ASEH and ISL73051ASEH are radiation
Features
hardened low-voltage, high-current, single-output LDOs
DLA SMD 5962-11212
specified for up to 3.0A of continuous output current.
Output current up to 3.0A at T = +150C
J
These devices operate across an input voltage range of
2.2V to 6.0V and can provide output voltages of 0.8V to
Output accuracy 1.5% over MIL temperature range
5.0V adjustable, based on the resistor divider setting.
Ultra low dropout:
Dropout voltages as low as 65mV can be achieved using
the device. 65mV (typical) dropout at 1.0A
The OCP pin allows the short-circuit output current limit 225mV (typical) dropout at 3.0A
threshold to be programmed by a resistor from the OCP
SET mitigation with no added filtering/diodes
pin to GND. The OCP setting range is 0.5A minimum to
Input supply range: 2.2V to 6.0V
8.5A maximum. The resistor sets the constant current
threshold for the output under fault conditions. The
Fast load transient response
thermal shutdown disables the output if the device
Shutdown current of 10A (typical)
temperature exceeds the specified value. It subsequently
enters an ON/OFF cycle until the fault is removed. The
Output adjustable using external resistors
ENABLE feature allows the part to be placed into a low
PSRR 66dB (typical) at 1kHz
current shutdown mode that typically draws about 10A.
Enable and PGood features
These devices are optimized for fast transient response and
Programmable soft-start/inrush current limiting
Single Event Effects (SEE). This reduces the magnitude of
Single Event Transients (SET) seen on the output.
Over-temp shutdown and programmable OCP limits
Additional protection diodes and filters are not needed.
Stable with 47F min tantalum capacitor
These devices are stable with tantalum capacitors as low as
47F and provide excellent regulation all the way from no
Radiation hardness (ISL75051ASEH only)
load to full load. Programmable soft-start allows the user
High dose rate (50-300rad(Si)/s): 100krad(Si)
to program the inrush current by using the decoupling
capacitor value on the BYP pin. Low dose rate (0.01rad(Si)/s): 50krad(Si)
Radiation hardness (ISL73051ASEH only)
Applications
LDO regulator for space applications Low dose rate (0.01rad(Si)/s): 50krad(Si)
DSP, FPGA, and P core power supplies
Related Literature
Post-regulation of switched mode power supplies For a full list of related documents, visit our website:
Down-hole drilling ISL75051ASEH, ISL73051ASEH device pages
0.30
EN
+150C
EN
BYP
ROCP
0.25
0.1F
OCP
ADJ +125C
VIN ISL75051ASEH VOUT
0.20
VIN
VOUT
R
1
PG
GND
0.15
0.1F 0.1F
220F 220F
+25C
2.67k
VIN
0.10
4.7nF
0.05
R
PG 2
0.00
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50
100pF
I (A)
OUT
Figure 2. Dropout vs I
Figure 1. Typical Application
OUT
FN8964 Rev.3.00 Page 1 of 22
May 16, 2019
Dropout Voltage (V)ISL75051ASEH, ISL73051ASEH
Contents
1. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Typical Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Radiation Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Typical Operating Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Applications Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Input Voltage Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Adjustable Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Input and Output Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.4 Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5 Power-Good. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.6 Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.7 Current Limit Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.8 Thermal Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5. Die and Layout Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6. Metallization Mask Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8. Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
FN8964 Rev.3.00 Page 2 of 22
May 16, 2019