December 2007 Rev 3 1/18
18
RHFL7913
Rad-Hard adjustable negative voltage regulator
Features
■3 A low dropout voltage
■Optional overtemperature and overcurrent
protection
■Adjustable overcurrent limitation
■Load short circuit monitoring
■Adjustable output voltage
■Inhibit (ON/OFF) TTL-compatible control
■Programmable output short-circuit current
limitation
■Remote sensing operation
■Rad-Hard: sustains 300 krad in Mil-1019.6 at
High & ELDRS low dose rate conditions
■Heavy ions, SEL and SEU immune; able to
Sustains 2x1014 protons/cm2 and 5x1014
neutrons/cm2
Description
The RHFL7913 adjustable is a high performance
Rad Hard negative voltage regulator. Available in
Flat-16 and new SMD5C hermetic ceramic
packages, it is specifically intended for space and
harsh radiation environments. It provides
exceptional electrical performances, high speed
and low dropout voltage.
Input supply ranges from -3 V to -12 V. It also
provide logical control / monitor functions (inhibit,
output monitor, short-circuit control) from/to
external positive voltage signals, while the entire
RHFL7913 adjustable analog functions are
biased at negative voltages with respect of ground
pin. The device is QML-V qualified with SMD
5962-02532.
Flat-16 SMD5C:
5-connection SMD
www.st.com
Contents RHFL7913
2/18
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 ADJ pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Inhibit ON-OFF control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4 Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.5 OCM pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.6 Alternates to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1 Remote sensing operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Die information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8 Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RHFL7913 Diagram
3/18
1 Diagram
Figure 1. Block diagram
Pin configuration RHFL7913
4/18
2 Pin configuration
Figure 2. Pin configuration (top view for Flat-16, bottom view for SMD5C)
Flat-16 SMD5C
Table 1. Pin description
Pin n° Flat-16 SMD5C
DSCC Part Ident. TBD TBD
1VI, Negative Input TBD
2VI, Negative Input TBD
3VI, Negative Input TBD
4ISC TBD
5OCMTBD
6VPLUS, Positive Supply
7GND
8N.C.
9N.C.
10 INHIBIT
11 ADJ
12 N.C.
13 VO, Negative Output
14 VO, Negative Output
15 VO, Negative Output
16 INHIBIT
RHFL7913 Maximum ratings
5/18
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 2. Maximum operating ratings (see Note:)
Symbol Parameter Value Unit
VIDC input voltage |VIN – VPLUS| -12
V
VPLUS Logical block supply voltage V(+)-V(GND), unless grounded +5
VIDC voltage, VIN–GND, VPLUS= 0V -12
VIDC voltage, VIN–GND, VPLUS=+3V -9
VODC output voltage range -9 to -1.20
IOUT Output current RHFL7913KPA 2 A
RHFL7913SCA 3
PDTC = 25 °C power dissipation RHFL7913KPA 15 W
RHFL7913SCA 15
TSTG Storage temperature range -65 to +150
°C
TOP Operating junction temperature range -55 to +150
ESD Electrostatic discharge capability Class 3
Table 3. Thermal data
Symbol Parameter Value Unit
RthJC Thermal resistance junction-case, Flat-16 and SMD5C 8.3 °C/W
TSOLD Maximum soldering temperature, 10 sec. 300 °C
Table 4. Recommended operating conditions
Symbol Parameter Value Unit
VIInput voltage range VI (at VPLUS= 0V) -12 to -3.7 V
VPLUS Positive supply range 0 to +3 V
VOOutput voltage range
VPLUS=0V, VI= -12 to -3.7V -9.5 to -1.2 V
VPLUS=+3V,VI= -9 to -3.7V -6.5 to -1.2 V
TAAmbient operating temperature range -55 to +125 °C
Electrical characteristics RHFL7913
6/18
4 Electrical characteristics
Table 5. Electrical characteristics
(TJ = 25 °C, VI = VO+2.5 V, CI = CO = 1 µF, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
VIOperating input voltage IO= 1A (KPA) or 2A (SCA) -12 -3.7 V
VOOperating output
voltage
IO= 1A, VO = -1.2V, FLAT 16 -1.28 -1.16
V
IO= 1A, VO = -9 V, F L AT 1 6 -9.6 -8.7
IO= 2A, VO = -1.2V, SMD5C -1.28 -1.16
IO= 2A, VO = -9V, SMD5C -9.6 -8.7
ΔVO/ΔVILine regulation
VI = VO - 2.5V to -12V, IO = 5mA,
TJ = 25°C 0.2
%
VI = VO - 2.5V to -12V, IO = 5mA,
TJ = -55°C and +125°C 0.5
ΔVO/VOLoad regulation
VI = VO - 2.5V, IO = 5mA to 400mA,
TJ = 25°C 0.4
VI = VO - 2.5V, IO = 5mA to 400mA
TJ = -55°C and +125°C 0.5
VI = VO - 2.5V, IO =-5mA to 1A, TJ = 25°C 0.5
VI = VO - 2.5V, IO = 5mA to 1A,
TJ = -55°C and +125°C 0.6
IQQuiescent current
ON MODE
IO = 5mA, VI = VO -2.5V, TJ = 25°C -3
mA
IO =-30mA, VI = VO -2.5V, TJ = 25°C -6
IO = 300mA VI = VO -2.5V,
TJ = 25°C and +125°C -15
IO = 300mA VI = VO -2.5V, TJ = -55°C -20
IO = 1A VI = VO -2.5V,
TJ = 25°C and +125°C -30
IO = 1A VI = VO -2.5V, TJ = -55°C -50
IO = 2A VI = VO -2.5V, VINH= 0,
TJ = +25°C and +125°C Only for SMD5C TBD
IO = 2A VI = VO -2.5V, VINH= 0,
TJ = -55°C Only for SMD5C, TBD
IQQuiescent current
OFF MODE
VO = -1.2V, VI = -7V, VPLUS = +5V,
VINH > 2.3V, TJ = -55°C to +125°C 1mA
RHFL7913 Electrical characteristics
7/18
VDDropout voltage
IO = 400mA VO =-2.5V to -9V, TJ = 25°C -450
mV
IO = 400mA VO =-2.5V to -9V,
TJ = -55°C and +125°C -500
IO = 1A VO =-2.5V to -9V, TJ = 25°C -750
IO = 1A VO =-2.5V to -9V,
TJ = -55°C and +125°C -800
IPLUS (1) VPLUS Current
VI = -5.5V, VPLUS = 5V, VINH = 5V,
TJ = 25°C 0.75
mA
VI= -5.5V, VPLUS = +5V, VINH = 5V
TJ = -55°C and +125°C 1
SVR (1) Supply voltage
rejection
VI = VO – 2.5V, IO = 5mA, F = 120Hz 60
dB
VI = VO – 2.5V, IO= 5mA, F = 33kHz 20
tPLH (1) Inhibit propagation
delay
VINH < 0.8V, VPLUS = 5V, VI = VO -2.5V
IO = 400mA 20
µs
tPHL (1) Inhibit propagation
delay
VINH >2.3V, VPLUS = 5V, VI = VO -2.5V
IO = 400mA 100
VINH(ON) Inhibit voltage VI = -7V VPLUS= +5V IO = 5mA
TJ = -55°C to 125°C
0.8
V
VINH(OFF) 2.3
ISH Shutdown input current VINH=5V 15 µA
VOCM OCM pin voltage Sinked IOCM = 10mA, active low 0.38 V
en Output noise voltage f = 10Hz to 100kHz IO = 5mA to 2A 40 µVrms
1. These values are guaranteed by design. For each application it’s strongly recommended to comply with the maximum
current limit of the package used.
Table 5. Electrical characteristics (continued)
(TJ = 25 °C, VI = VO+2.5 V, CI = CO = 1 µF, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
Device description RHFL7913
8/18
5 Device description
The RHFL7913 adjustable contains a NPN-type power element controlled by signal
resulting from amplified comparison between internal temperature compensated band-gap
cell and the fraction of the desired output voltage value, generated by an external resistor
divider bridge. The NPN structure allows access to lower drop out levels because its base
current can be routed to ground pin and not to output. To control and monitor the device
from / to the external logic world – usually operating in positive voltage area – a dedicated
logic interface block (INHIBIT and OCM functions) has been implemented with +3 V to +5 V
supplied line (V+). In case V(+) = 0 V, inhibit and OCM functions are not available: In this
condition, INHIBIT function is ON and OCM pin is “no care”. The device is internally
protected by several blocks.
5.1 ADJ pin
The load voltage feed back comes from an external divider resistor bridge middle point to
ADJ pin established between load terminals.
5.2 Inhibit ON-OFF control
When INHIBIT pin is TTL-high (positive), the device switches off current and voltage output.
The device is ON when INHIBIT pin is set TTL-low.
5.3 Overtemperature protection
A temperature detector internally monitors power element junction temperature. The device
goes OFF circa 165 °-175 °C are reached, and returns ON when circa 100 °C. When
internal temperature detector reaches 170 °C, the active power element can be at 225 °C:
Device reliability cannot be granted during extensive operation duration with these
conditions.
5.4 Overcurrent protection
ISC pin. An internal non-fold back short-circuit limitation is set with ISHORT > 4 A (VO is 0 V).
This value can be downward modified by an external resistor connected between ISC and VI
pins, with a typical value range of 10 kΩ to 200 kΩ. To keep excellent VO regulation, it is
necessary to set ISHORT 1.6 times greater than the maximum desired application IO. When
IO reaches ISHORT – 300 mA, the current limitor overrules regulation and VO starts to drop
and OCM flag is risen. When no current limitation adjustment is required, ISC pin shall be left
unbiased (as it is in 3 pin packages).
5.5 OCM pin
Goes low when current limitor starts to be active, otherwise VOCM = V (+). It is bufferized
and can sink 10 mA. OCM pin is internally pulled-up by a 50 kΩ resistor. Can left open when
V (+) = 0.
RHFL7913 Device description
9/18
5.6 Alternates to
RHFL7913 is recommended to replace all industry negative regulators due to its exceptional
radiation performances. To replace 3-terminal industry devices, use customized RHFL7913
fixed voltage versions.
Application information RHFL7913
10/18
6 Application information
Adjusting output voltage: R1 resistor must be connected between VO and ADJ pins. R2
resistor must be connected between ADJ and GND pins. Resistor values can be derived
from the following formula:
VO = VADJ (1 + R1/R2) with VADJ = -1.20 V
To access all RHFL7913 adjustable functionality, V (+) shall be set at 3.0 V (max 5 V). As a
consequence, VI (-) cannot be greater than –9.0 V (resp. –7 V) due to –12 V maximum
operation rating.
The device is functional as soon as VI - VO voltage difference is slightly above power
element saturation voltage. The adjustable pin to Ground resistor shall not be greater than
10 kΩ to make output feedback error be below 0.2%. A minimum 0.5 mA IO is necessary to
set to ensure perfect “no-load” regulation. It can be wise to dissipate this current into the
divider bridge resistor.
All available VI pins shall always be PCB interconnected, the same for all available VO pins,
otherwise device stability and reliability cannot be granted. The INHIBIT function switches
off output current in an electronic way, is very quickly. According to Lenz’ Law, external
circuitry reacts with –LdI/dt terms which can be of high amplitude in case some series-
inductance exists. Effect would be large transient voltage developed on both device
terminals. External Schottky diodes may prevent voltage excursions beyond max ratings. In
the worst case, a 14 V Zener diode shall protect the device input. In case of inductive load, a
input-output protection diode can be necessary to prevent VO to be greater than VI during
transient operation.
The device has been designed for high stability and low drop out operation: minimum 1 µF
input and output tantalum capacitors are therefore mandatory. Typical industry PCB design
practices 10 µF capacitors values are acceptable. Capacitor ESR range is from 0.5 Ω to over
20 Ω. Such range turns out to be useful when ESR increases at low temperature. When
large transient currents are expected, larger value capacitors are necessary.
In case of high current operation with expected short-circuit events, caution shall be
considered relatively to capacitors. They shall be connected as close as possible form
device terminals. As some tantalum capacitors may permanently fail when submitted to high
charge-up surge currents, it is recommended to decouple them with 470 nF polyester
capacitors.
RHFL7913 adjustable being manufactured with very high speed bipolar technology (6 GHz
fT transistors), the PCB layout shall be performed with unprecedented care, very low
inductance, low mutually coupling lines, otherwise high frequency parasitic signals may be
picked-up by the Device resulting into system self-oscillation. In difficult high current
circumstances (coming from PCB layout) a 470 nF polyester capacitor connected between
VO and ADJ pin increases stability margins. Benefit is SVR performances extended to far
higher frequencies.
RHFL7913 Application information
11/18
6.1 Remote sensing operation
When load is physically far away from device output, the adjustable line can be set as a
kelvin sense line by implementing the divider resistor bridge as close as possible form
device, with a decoupling capacitor. The adjust pin kelvin sense line (to be not coupled with
power line) picks-up load voltage (load also locally decoupled with a capacitor). This layout
eliminates ohmic drop in load power wire. Similarly, by taking advantage of two separate
ground terminals: power ground pin shall be directly connected to load ground terminal
which is also the system ground, device signal ground shall be separately connected to load
ground terminal by another kelvin line: In this way, ground ohmic errors are minimized
because the only current flowing into device signal ground pin kelvin line is device Iq (a
matter of a few mA).
Die information RHFL7913
12/18
7 Die information
RHFL7913 adjustable is also available in die form. Space dice are electrically tested by
STMicroelectronics in such a way that, when mounted in proper thermal and electrical
substrate, they are in full compliance with equivalent packaged device:
DIE physical dimensions.
DIE size: 110 mils x 166 mils
DIE thickness: 375 µm +/-25 µm (14.8 mils +/- 1 mil)
Pad size:
VI, VO pads: 245 µm x 544 µm
Control pads: 184 µm x 184 µm
Interface materials
Top Metallization: Al/Si/Cu 1.05 µm +/- 0.15 µm
Backside metallization: None
Glassivation
Type: P.Vapox + Nitride
Thickness: 0.6 µm +/- 0.1µm + 0.6µm +/-0.08 µm
Substrate: Silicon (connected to VI = Vminus)
The SENSE pad is layout on the die but is not electrically connected to the IC and shall be
left non-bonded during hybrid bonding.
Figure 3. DIE size
RHFL7913 Die information
13/18
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 2.16 2.72 0.085 0.107
b0.430.017
c0.130.005
D9.910.390
E6.91 0.272
E2 4.32 0.170
E30.76 0.030
e 1.27 0.050
L 6.72 0.265
Q 0.66 1.14 0.026 0.045
S1 0.130.005
FLAT-16 (MIL-STD-1835) mechanical data
7450901A
18
16
eb
c
L
E
D
S1Q
A
E2
E3
L
E3
9
Die information RHFL7913
14/18
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A2.843.00 3.15 0.112 0.1180.124
A1 0.25 0.38 0.51 0.010 0.015 0.020
b7.137.26 7.39 0.281 0.286 0.291
b1 4.95 5.085.21 0.195 0.200 0.205
b2 2.282.41 2.54 0.090 0.095 0.100
b3 2.923.05 3.180.115 0.120 0.125
D13.71 13.8413.97 0.540 0.545 0.550
D1 0.76 0.030
E7.39 7.52 7.65 0.291 0.296 0.301
e1.91 0.075
SMD5C mechanical data
7924296B
RHFL7913 Packaging
15/18
8 Packaging
RHFL7913 adjustable is available in high thermal dissipation 16 pin hermetic Flat package,
which bottom flange is metallized to allow direct soldering to heat sink (efficient thermal
conductivity). It is also available in SMD5C hermetic ceramic package.
Order codes RHFL7913
16/18
9 Order codes
Note: EM1: Engineering parts, full temperature range, flight packages, no burn-in
EM2: Same as above but with burn-in, used in Satellite EQMs
Table 6. Order codes
Die Flat-16 SMD5C Terminal
finish Quality level
RHFL7913KPA1 GOLD EM1
RHFL7913KPA2 GOLD EM2= EM1 + 48hours BI
RHFL7913KPA-01V GOLD QML-V
RHFL7913KPA-02V SOLDER QML-V
RHFL7913SCA1 GOLD EM1
RHFL7913SCA2 GOLD EM2= EM1 + 48hours BI
RHFL7913SCA-03V GOLD
L7913ADIE2S EM1 die
L7913ADIE2V QML-V
Table 7. Part number - SMD equivalent
ST part number SMD part number
RHFL7913KPA-01V 5962F0253201VXC
RHFL7913KPA-02V 5962F0253201VXA
RHFL7913SCA-03V
L7913ADIE2V 5962F0253201V9A
Table 8. Environmental characteristics
Parameter Conditions Value Unit
Output voltage thermal drift -55 °C to +125 °C 40 ppm/°C
Output voltage radiation drift From 0 kRad to 300k Rad at 0.55rd/sec 8 ppm/krad
Output voltage radiation drift From 0 kRad to 300 kRad, MIL1019.5 6 ppm/krad
RHFL7913
18/18
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