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DATASHEET
ISL70002SEH
Radiation Hardened and SEE Hardened 18A Synchronous Buck Regulator with
Current Sharing
FN8264
Rev.10.00
Apr 5, 2019
The ISL70002SEH is a radiation hardened and SEE hardened
high-efficiency monolithic, synchronous buck regulator with
integrated MOSFETs. This single chip power solution operates
over an input voltage range of 3V to 5.5V and provides a
tightly regulated output voltage that is externally adjustable
from 0.8V to ~85% of the input voltage. Output load current
capability is primarily determined by PVIN voltage with up to
22A for a single IC at PVIN 5.5V for TJ +125°C. Two
ISL70002SEH devices, configured to current share, can
provide up to 38A of total output current at PVIN 5.5V for
TJ +125°C assuming ±27% worst-case current share
accuracy.
The ISL70002SEH uses peak current-mode control with
integrated error amp compensation and pin-selectable slope
compensation. Switching frequency is also pin selectable to
either 1MHz or 500kHz. Two devices can be synchronized
180° out-of-phase to reduce input RMS ripple current.
High integration makes the ISL70002SEH an ideal choice to
power small form factor applications. Two devices can be
synchronized to provide a complete power solution for large
scale digital ICs, like Field Programmable Gate Arrays
(FPGAs) that require separate core and I/O voltages.
Applications
• FPGA, CPLD, DSP, CPU core, and I/O voltages
• Low-voltage, high-density distributed power systems
Related Literature
For a full list of related documents, visit our website:
ISL70002SEH device page
100
95
90
85
80
75
70
65
60
0.95VOUT
1.2VOUT
1.5VOUT
55
1.8VOUT
2.5VOUT
3.3VOUT
50
0 2 4 6 8 10 12 14 16 18 20 22
LOAD CURRENT (A)
FIGURE 1. EFFICIENCY 5V INPUT, 500kHz, Tcase = +25°C
Features
• DLA SMD 5962-12202
• Maximum output current for a single device: Up to 22A (See
“Absolute Maximum Ratings in a Heavy Ion Environment” on
page 9)
• Maximum output current for two current sharing devices
based on 27% worst case current share mismatch: Up to
38A (See “Absolute Maximum Ratings in a Heavy Ion
Environment”)
• Available in a thermally enhanced heat spreader package
(R64.C)
• 1MHz or 500kHz switching frequency
• 3V to 5.5V supply voltage range
• ±1% reference voltage (line, load, temperature, and rad)
• Redundancy/junction isolation: exceptional SET
performance
• Excellent transient response
• High efficiency >90%
• Two ISL70002SEH synchronization, inverted-phase
• Comparator input for enable and power-good
• Input undervoltage, output undervoltage, and adjustable
output overcurrent protection
• QML qualified per MIL-PRF-38535
• Full military temperature range operation (-55°C to +125°C)
• Radiation environment
- High dose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100krad(Si)
- ELDRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100krad(Si)*
*Level assured by characterization; “EH” version is
production tested to 50krad(Si).
• SEE hardness
- SEL and SEB LETTH . . . . . . . . . . . . . . . . 86.4MeV/mg/cm2
- SEFI LETTH. . . . . . . . . . . . . . . . . . . . . . . . . . 43MeV/mg/cm2
- SET LETTH . . . . . . . . . . . . . . . . . . . . . . . . 86.4MeV/mg/cm2
25
20 CH1 MASTER LX + 20V
15
CH2 SLAVE LX + 15V
10
CH3 VOUT x 10
5
CH4 SYNC
0
-6 -4 -2 0 2 4 6 8 10 12 14
FIGURE 2. 2-PHASE SET PERFORMANCE AT 86.4MeV/mg/cm2
FN8264 Rev.10.00
Apr 5, 2019
Page 1 of 27

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ISL70002SEH
Typical Application Schematic
FIGURE 3. SINGLE UNIT OPERATION
FN8264 Rev.10.00
Apr 5, 2019
Page 2 of 27

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ISL70002SEH
Typical Application Schematic (Continued)
FIGURE 4. TWO-PHASE OPERATION WITH CURRENT SHARING
FN8264 Rev.10.00
Apr 5, 2019
Page 3 of 27

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ISL70002SEH
Functional Block Diagram
PORSEL
SC0
SC1
SS
FB
PGOOD
REF
FSEL
SYNC
M/S
POWER-ON
RESET (POR)
CURRENT
SHARE
SOFT-
START
SLOPE
COMPENSATION
EA GM
PWM
CONTROL
LOGIC
CURRENT
SENSE
GATE
DRIVE
ISHEN
ISHSL
ISHCOM
PVINx
LXx
COMPENSATION
UV
POWER-GOOD
PWM
REFERENCE
0.6V
PGNDx
OVERCURRENT
ADJUST
GND
PGNDx
OCA
OCB
OCSSA
OCSSB
BIT
TRIM
TDI
TDO
TPGM
PGNDx
AGND
FIGURE 5. FUNCTIONAL BLOCK DIAGRAM
DGND
FN8264 Rev.10.00
Apr 5, 2019
Page 4 of 27

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ISL70002SEH
Ordering Information
ORDERING SMD NUMBER
(Note 2)
PART NUMBER
(Note 1)
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
5962R1220201VXC
ISL70002SEHVF
-55 to +125
64 Ld CQFP
R64.A
5962R1220201VYC
ISL70002SEHVFE
-55 to +125
64 Ld CQFP with heat spreader
R64.C
5962R1220201V9A
ISL70002SEHVX
-55 to +125
Die
N/A
ISL70002SEHF/PROTO (Notes 3)
-55 to +125
64 Ld CQFP
R64.A
N/A
ISL70002SEHFE/PROTO (Notes 3)
-55 to +125
64 Ld CQFP with heat spreader
R64.C
N/A
ISL70002SEHX/SAMPLE (Notes 3)
-55 to +125
Die
N/A
ISL70002SEHEVAL1Z (Note 4)
Evaluation Board
N/A
ISL70002SEHEVAL2Z (Note 4)
Current Sharing Evaluation Board
N/A
ISL70002SEHDEMO1Z (Note 4)
High Current Sharing Demonstration Board
NOTES:
1. These Pb-free Hermetic packaged products employ 100% Au plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb
and Pb-free soldering operations.
2. Specifications for Rad Hard QML devices are controlled by the Defense Logistics Agency Land and Maritime (DLA). The SMD numbers listed must be
used when ordering.
3. The /PROTO and /SAMPLE are not rated or certified for Total Ionizing Dose (TID) or Single Event Effect (SEE) immunity. These parts are intended for
engineering evaluation purposes only. The /PROTO parts meet the electrical limits and conditions across the temperature range specified in the DLA
SMD and are in the same form and fit as the qualified device. The /SAMPLE die is capable of meeting the electrical limits and conditions specified
in the DLA SMD at +25°C only. The /SAMPLE is a die and does not receive 100% screening across the temperature range to the DLA SMD electrical
limits. These part types do not come with a certificate of conformance because there is no radiation assurance testing and they are not DLA qualified
devices.
4. Evaluation board uses the /PROTO parts. The /PROTO parts are not rated or certified for Total Ionizing Dose (TID) or Single Event Effect (SEE) immunity.
Pin Configuration
(64 LD CQFP)
TOP VIEW
BOTTOM SIDE DETAIL
FOR PIN 1 LOCATION
1 (FB)
FB
ISHA
ISHREFA
ISHB
ISHREFB
ISHC
ISHREFC
AVDD
AGND
DGND
DVDD
SS
PGOOD
ISHCOM
ISHSL
ISHEN
NOTE:
5. The ESD triangular mark is indicative of Pin
#1’s location. It is a part of the device
marking and is placed on the lid in the
quadrant where Pin #1 is located.
1 64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
2 47
3 46
4 45
5 44
6 (Note 5)
7
43
42
8 41
9 40
10 39
11 38
12 37
13 36
14 *HEAT SPREADER OUTLINE
15
35
34
16 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LX3
PGND3
PGND4
LX4
PVIN4
PVIN5
LX5
PGND5
PGND6
LX6
PVIN6
PVIN7
LX7
PGND7
PGND8
LX8
* Indicates heat spreader package R64.C
FN8264 Rev.10.00
Apr 5, 2019
Page 5 of 27