Intersil ISL72991RHF/PROTO Radiation hardened negative low dropout adjustable voltage regulator Datasheet

ISL72991RH
®
Data Sheet
June 2004
Radiation Hardened Negative Low
Dropout Adjustable Voltage Regulator
FN9054.1
Features
• Electrically Screened to DSCC SMD # 5962-02503
The radiation hardened ISL72991RH is a low dropout
adjustable negative regulator with an output voltage range of
-2.25V to -26V. The device features a 1A output current
capability, an adjustable current limit pin (ILIM) and a
shutdown pin (SD) for easy on/off control.
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Environment
- Total Dose (Max) . . . . . . . . . . . . . . . . . . . . 300krad(SI)
- Latch-Up Immune
The device incorporates unique circuitry that enables
precision performance over the -55°C to +125°C temperature
range and post-irradiation. Specifications include a reference
voltage of -1.25V +40mV/-50mV (max), line regulation of
±25mV (max), and load regulation of ±15mV (max).
• Line Regulation . . . . . . . . . . . . . . . . . . . . . . ±25mV (max)
Constructed with the Intersil dielectrically isolated Rad Hard
Silicon Gate (RSG) BiCMOS process, these devices are
immune to Single Event Latch-up and have been specifically
designed to provide highly reliable performance in harsh
radiation environments.
• Dropout Voltage (1A) . . . . . . . . . . . . . . . . . . . . . .1V (max)
Specifications for Rad Hard QML devices are controlled
by the Defense Supply Center in Columbus (DSCC). The
SMD numbers listed here must be used when ordering.
Detailed Electrical Specifications for these devices are
contained in SMD 5962-02503. A ‘hotlink’ is provided on
the Intersil website for downloading.
Pinout
• Load Regulation . . . . . . . . . . . . ±12mV (typ); ±15mV (max)
• Output Voltage Range . . . . . . . . . . . . . . . . -2.25V to -26V
• Dropout Voltage (100mA). . . . . . . . 0.2V (typ); 0.3V (max)
• Minimum Load Current. . . . . . . . . . . . . . . . . . . . . . .3.0mA
• TTL Input-Level Shutdown (SD); Low = On
Applications
• Switching Power Supplies
• DC/DC Converters
• Motor Controllers
Ordering Information
ORDERING NUMBER
ISL72991RHF (FLATPACK CDFP3-F28)
TOP VIEW
INTERNAL
MKT. NUMBER
TEMP. RANGE
(°C)
5962F0250301VXC
ISL72991RHVF
-55 to 125
5962F0250301QXC
ISL72991RHQF
-55 to 125
VIN
1
28
VIN
5962F0250301V9A
ISL72991RHVX
-55 to 125
VIN
2
27
VIN
NC
3
26
NC
ISL72991RHF/Proto
ISL72991RHF/Proto
-55 to 125
NC
4
25
NC
NC
5
24
NC
NC
6
23
NC
NC
7
22
NC
NC
8
21
NC
NC
9
20
NC
NC
10
19
NC
GND
11
18
ADJ
ILIM
12
17
SD
VOUT
13
16
VOUT
VOUT
14
15
VOUT
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL72991RH
Application Information
Typical User Application:
VIN
VOUT
VOUT
ISL72991RH
ADJ
CC
R1
COUT
RCL
CIN
R2
VIN
ILIM
SD
GND
Capacitor Selection
FIGURE 1. TYPICAL APPLICATION SCHEMATIC
Output Voltage Programming
The output voltage of the regulator can be programmed with
two external resistors and is described by the following
equation: VOUT = VREF x (1+R2/R1) - (IADJ x R2).
Output Current Limit Programming
IOUT_LIM (A)
The output current limit threshold of the regulator can be
programmed with a single external resistor connected from
ILIM to ground. The current flowing into the ILIM pin is
described by the following equation: ILIM = 1V/(RCL + 2400).
The graph below shows the relationship between ILIM and
the output current limit threshold, IOUT_LIM.
ILIM (A)
FIGURE 2. IOUT_LIM vs ILIM
2
An input capacitor is required if the regulator is located more
than 6 inches from power supply filter capacitors. A 10µF
solid tantalum capacitor is recommended.
An output capacitor of at least 10µF must be used to insure
stability of the regulator. Additional capacitance may be
added as required to improve the dynamic response of the
regulator. Solid tantalum and/or ceramic capacitors are
recommended.
Loop Compensation
The output capacitor and ESR comprise a zero in the loop
transfer function that must be compensated with a pole to
insure loop stability in accordance with the following
equation: CC x R2 = COUT x ESR. The compensating
capacitor should be a low ESR ceramic type.
Layout Guidelines
The stability of the regulator is sensitive to layout. It is
strongly recommended that a continuous copper ground
plane (1 ounce or greater) be used. In addition, component
lead lengths and interconnects should be minimized, but
should not exceed 1/2 inch. Finally, the return lead of the
compensation capacitor (CC) should be connected as close
as possible to the GND pin of the IC.
ISL72991RH
Die Characteristics
DIE DIMENSIONS:
Backside Finish:
5870µm x 5210µm (231.1mils x 205.1mils)
Thickness: 483µm ± 25.4µm (19mils ± 1mil)
INTERFACE MATERIALS:
Silicon
ASSEMBLY RELATED INFORMATION:
Substrate Potential:
Glassivation:
Unbiased (DI)
Type: PSG (Phosphorous Silicon Glass)
Thickness: 8.0kÅ ± 1.0kÅ
ADDITIONAL INFORMATION:
Worst Case Current Density:
Top Metallization:
<2.0 x 105 A/cm2
Type: AlSiCu
Thickness: 16.0kÅ ± 2kÅ
Transistor Count:
Substrate:
Radiation Hardened Silicon Gate,
Dielectric Isolation
Metallization Mask Layout
ISL72991RH
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
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