DATASHEET

100V Linear Bias Supply
ISL6719
Features
The ISL6719 is a low cost linear regulator for generating a low
voltage bias supply from intermediate distributed voltages
commonly used in telecom and datacom applications. It
provides a single adjustable output rated at 100mA from
either the input source or an auxiliary source such as a
transformer winding. The auxiliary source is selected whenever
it has sufficient voltage to sustain the output.
• 100V+ input capability
The ISL6719 may be used as a start-up or a continuous low
power regulator. When operating as a start-up regulator, it is
capable of sourcing 100mA from a 100V source for short
durations. This period of time allows the power supply to
start-up and provide an alternate power source, such as the
output of a transformer winding, to the AUXIN input. This
allows the regulated output to operate from a lower source
voltage to minimize power loss.
Pin Configuration
• Adjustable output from 1.5V to 20V
• Up to 100mA output current
• Overcurrent protection
• Over-temperature protection
• ENABLE and ENABLE_N inputs
• Package compliant with IPC2221A, creepage and clearance
spacing requirements
Applications
• Telecom/datacom DC/DC converters
• Low power bias supplies
ISL6719
(9 LD DFN)
TOP VIEW
VPWR
1
9 GND
8 ENABLE_N
AUXIN
2
7 ENABLE
VSW
3
6 COMPB
VSW_FB
4
5 COMPA
Ordering Information
PART NUMBER
(Note 1, 2, 3)
ISL6719ARZ
PART MARKING
TEMP RANGE
(°C)
19AZ
-40 to +105
PACKAGE
(Pb-free)
9 Ld DFN
PKG.
DWG. #
L9.3x3
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL6719. For more information on MSL, please see tech brief TB363.
July 15, 2014
FN6555.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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All other trademarks mentioned are the property of their respective owners.
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Functional Block Diagram
0V TO 40V
VPWR
AUXIN
105V MAX
2
INPUT
SELECTOR
1.5V TO 20V
@ 100mA
VSW
REGULATOR
START/STOP
UV COMPARATOR
+
-
GND
INT. BIAS
INT. BIAS
ENABLE
+
_
1.5V REF
VSW_FB
TEMP OK
COMPA
TMON
+150ºC TRIP
+95ºC CLEAR
COMPB
INT. BIAS
ENABLE
INT-ENABLE
ENABLE_N
POR
-
+
-
+
BG
ISL6719
BG +-
VPWR OK
VSW
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Typical Application
CONVERTER POWER STAGE
+VOUT
VIN+
3
17V TO 100V
VIN-
RETURN
ENABLE
DISABLE
GND 9
ENABLE_N 8
AUXIN
2
PWM
ENABLE 7
3 VSW COMPB 6
4
R1
COMPA
VSW_FB
ISL6719
C1
C2
1.0F
R2
5
C3
220pF
FEEDBACK
AMPLIFIER
ISL6719
1 VPWR
FN6555.2
July 15, 2014
ISL6719
Absolute Maximum Ratings
Thermal Information
Supply Voltage, VPWR . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 105V
AUXIN, VSW_FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 40V
COMPB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 30V
VSW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 25V
All Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to + 6.0V
Thermal Resistance (Typical)
JA (°C/W)
JC (°C/W)
9 Ld DFN (Notes 4, 5). . . . . . . . . . . . . . . . . .
54
2.8
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . -55°C to +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +105°C
Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . . . . . 18VDC to 80VDC
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
6. All voltages are with respect to GND.
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 2
and “Typical Application” on page 3. 17V < VPWR < 100V, CVSW = 1µF, IVSW = -3mA, VSW Enabled, TA = -40°C to +105°C (Note 7), Typical values are at
TA = +25°C.
PARAMETER
TEST CONDITIONS
MIN
(Note 8)
TYP
MAX
(Note 8)
UNITS
100
V
SUPPLY VOLTAGE (VPWR)
Supply Voltage
Start-Up Current (IVPWR)
VPWR = 12V
250
450
µA
Operating Current (IVPWR)
VSW Enabled, VPWR = 100V, VSW = 10V, 20V,
IVPWR - IVSW
1.1
2.0
mA
VSW Disabled, VPWR = 100V,
1.1
2.0
mA
AUXIN Biased at 40V, VSW Enabled,
VPWR = 100V, VSW = 10V, 20V,
IVSW = -100mA
1.1
2.0
mA
UVLO START Threshold
VSW Disabled
13.0
16.5
V
UVLO STOP Threshold
VSW Disabled
12.0
15.0
V
Hysteresis
UVLO START - UVLO STOP
1.7
V
40
V
1.5
µF
+5
%
0.8
1.2
AUXILIARY VOLTAGE (AUXIN)
Maximum Bias
VPWR = 17V, 100V
OUTPUT VOLTAGE (VSW)
Load Capacitance Range
(Note 9)
Overall Accuracy
VPWR = 18V, 100V, VSW = 5V, 10V, 12V
AUXIN = 15V, IVSW = -3mA to -100mA
Setpoint Range
VPWR = 100V, AUXIN = 30V
1.55
Reference
VSW_FB = VSW
1.45
Source Voltage Headroom (AUXIN - VSW)
VPWR = 17V, VSW = 10V, IAUXIN = 0.95*IVSW
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0.47
1.0
-5
20
V
1.50
1.55
V
IVSW = -100mA
1.8
3.0
V
IVSW = -50mA
1.4
2.0
V
FN6555.2
July 15, 2014
ISL6719
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 2
and “Typical Application” on page 3. 17V < VPWR < 100V, CVSW = 1µF, IVSW = -3mA, VSW Enabled, TA = -40°C to +105°C (Note 7), Typical values are at
TA = +25°C. (Continued)
MAX
(Note 8)
UNITS
IVSW = -100mA
6.2
V
IVSW = -50mA
5.2
V
-3
mA
25
V
PARAMETER
TEST CONDITIONS
Source Voltage Headroom (VPWR - VSW)
MIN
(Note 8)
TYP
VSW = 20V, AUXIN = 0V
Minimum Required Load
Maximum VOUT, Faulted VSW_FB
VSW_FB = 0V, VPWR = 100V, AUXIN = 40V
21
Long Term Stability
TA = +125°C, 1000 hours (Note 8),
VPWR = 48V, VSW = 10V, IVSW = -10mA,
AUXIN = 15V
Operational Current (source)
VPWR = 48V, AUXIN = 17V, VSW = 15V
-100
Current Limit
VPWR = 48V, AUXIN = 15V, VSW = 10V
-100
VSW_FB Bias Current
VPWR = 100V, AUXIN = 40V, VSW = 10V,
VSW_FB = 1.5V
-0.5
COMPA, COMPB Recommended
Capacitance
(Note 9)
170
0.3
%
mA
-230
220
-400
mA
1.5
µA
270
pF
COMPA Voltage
0.7
V
COMPB Voltage
VSW + 5.0
V
ENABLE, ENABLE_N
High Level Input Voltage (VIH)
VPWR = 48V, AUXIN = 0V
2.5
3.0
3.6
V
Low Level Input Voltage (VIL)
VPWR = 48V, AUXIN = 0V
1.6
2.0
2.5
V
Hysteresis
VPWR = 48V, AUXIN = 0V
0.7
1.0
1.3
V
Pull-Up Resistance
VENABLE = VN_ENABL = 0V
-
100
-
kΩ
Turn-On Delay
TVSW, 10% - TENABLE, T VSW,10% - TENABLE_N,
IVSW = -3mA
25
µs
Turn-Off Delay
TVSW, 10% - TENABLE, T VSW,10% - TENABLE_N,
IVSW = -50mA
40
µs
150
°C
Thermal Shutdown Clear
95
°C
Hysteresis
55
°C
THERMAL PROTECTION
Thermal Shutdown
NOTE:
7. Specifications at -40°C and +105°C are guaranteed by +25°C test with margin limits.
8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and
are not production tested.
9. Limits established by characterization and are not production tested.
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ISL6719
Typical Performance Curves
5.5
2.5
AUXIN - VSW (V)
VPWR - VSW (V)
5.0
4.5
4.0
2.0
1.5
3.5
3.0
0
20
40
60
80
1.0
100
0
20
VSW CURRENT (mA)
FIGURE 1. VPWR - VSW vs IVSW @ AUXIN = 0V, +25°C
80
100
1.0010
NORMALIZED OUTPUT VOLTAGE
NORMALIZED REGULATION
60
FIGURE 2. AUXIN - VSW vs IVSW @ VPWR = 17V, +25°C
1.002
VSW = 20V, AUXIN = 30V
1.001 VSW = 1.5V, AUXIN = 15V
VSW = 5V, AUXIN = 15V
1.000
0.999
VSW = 12V, AUXIN = 15V
0.998
VSW = 15V, AUXIN = 30V
0.997
-40
40
VSW CURRENT (mA)
-25
-10
5
20
35
50
65
80
95
110
VSW = 5V
1.0005
VSW = 10V
1.0000
VSW = 12V
0.9995
0.9990
0
TEMPERATURE (°C)
FIGURE 3. VSW REGULATION vs TEMPERATURE @ VPWR = 100V,
IVSW = 3mA
Pin Descriptions
VPWR
VPWR is the power connection for the IC. UVLO
enables/disables the output and places the device into a
standby mode even if AUXIN is externally biased.
To optimize noise immunity, bypass VPWR to GND with a
ceramic capacitor as close to the VPWR and GND pins as
possible.
AUXIN
This is the input for an external bias source typically provided
by an auxiliary transformer winding. This input is not required
and may be grounded or left open. Maximum input bias is 40V.
ENABLE
The positive logic on/off control input. A logic high enables
VSW. Asserting this signal low turns off VSW. ENABLE and
ENABLE_N are logically ORed. Either signal can enable VSW,
but both must be false to disable VSW.
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10
20
30
40
50
60
70
80
90
100
LOAD (mA)
FIGURE 4. VSW REGULATION vs LOAD @ VPWR = 18V,
AUXIN = 15V, +25°C
ENABLE_N
The negative logic on/off control input. A logic low enables
VSW. Asserting this signal high turns off VSW. ENABLE and
ENABLE_N are logically ORed. Either signal can enable VSW,
but both must be false to disable VSW.
GND
Signal and power ground connections for this device.
VSW
This is the switched regulated low voltage output supply that is
derived from VPWR or AUXIN. Its output is adjustable from
1.5V to 20V using an appropriate divider from VSW to VSW_FB.
Protection circuitry prevents the output from exceeding 25V in
the event of a fault on VSW_FB (short high or low). The
minimum output current capability is 100mA. VSW requires a
minimum load of 3mA.
VSW_FB
The feedback pin for VSW. A divider from VSW to ground sets
feedback for VSW and determines the output voltage.
FN6555.2
July 15, 2014
ISL6719
COMPA, COMPB
A compensating capacitor is placed between COMPA and
COMPB to stabilize the control loop. The values may vary
depending on the output load and capacitance applied between
VSW and GND, but for all applications having a 1.0µF load
capacitor, a 220pF compensation capacitor is recommended.
The voltage at COMPA is nominally 0.7V. The voltage at COMPB
is nominally VSW +5.0V.
Functional Description
Features
The output voltage is adjusted using the VSW_FB input. The
VSW is set with a resistor divider from VSW to ground with the
central node connected to VSW_FB. Refer to Figure 5.
Referring to Equation 1, the VREF is nominally 1.5V and IBIAS
has a maximum value of 1.5µA. The error introduced by the
VSW_FB bias current can be minimized by making the product
of R1 x IBIAS small, relative to the magnitude of the desired
output voltage. For example, setting R1 x IBIAS equal to 0.5%
of VSW yields a value for R1 equal to 3.33 x VSW (k).
R1 + R2
VSW = V REF --------------------- – I BIAS R 1
R
(EQ. 1)
V
2
The control circuitry used in Telecom/Datacom DC/DC
converters typically requires an operating bias voltage
significantly lower than the source voltage available to the
converter. Many applications use a discrete linear regulator from
the input source to create the bias supply. Often an auxiliary
winding from the power transformer is used to supplement or
replace the linear supply once the converter is operating. The
auxiliary winding bias voltage may require regulation as well to
minimize the voltage variation inherent in slave windings. When
implemented discretely, this circuitry occupies significant PWB
area, a considerable problem in today’s high density converters.
The ISL6719 linear regulator simplifies the start-up and
operating bias circuitry needed in Telecom and Datacom DC/DC
converters by integrating these functions, and more, in a small
3mm x 3mm DFN package.
The VSW requires an external compensation capacitor to
remain stable across the output adjustment range, output
capacitance and loading. A value of 220pF between COMPA
and COMPB is recommended for all operating conditions with
a nominal load capacitance of 1.0µF (0.47µF to 1.5µF). The
VSW requires a minimum load of 3mA.
1 VPWR
GND 9
ENABLE_N 8
VSW
AUXIN
2
ENABLE
7
AUXIN
3
6
VSW COMPB
4
COMPA
5
VSW_FB
R1
AUXIN is the auxiliary input of the ISL6719, accepting bias
voltage whenever the input source voltage, VPWR, is above its
undervoltage lockout (UVLO) threshold. The VSW selects AUXIN
as its source when it is capable supporting the load on VSW.
Otherwise VPWR is selected.
AUXIN can accept voltages up to 40V maximum. Voltages in
excess of 40V, including transients, will cause permanent
damage to the device. Care should be taken when connecting
external sources through very long traces or lead wires. The
lead inductance may cause unexpected transients in excess of
the device’s ratings. In such circumstances it is recommended
that a small resistor be placed between AUXIN and the
external source to dampen the transient. A value of 10 to
100 is usually sufficient.
C2
1.0F
R2
C3
220pF
FIGURE 5. VSW ADJUSTMENT AND COMPENSATION
VSW
The VSW is the switched output and may be turned on and off
using the ENABLE or ENABLE_N pins. The VSW is adjustable
from 1.5V to 20V, but must always be at least 6.2V lower than
VPWR at rated load. Additionally, VSW must be at least 3.0V
lower than AUXIN for it to function as the source for VSW. As the
differential voltage between AUXIN and VSW drops below 3.0V,
the input current will shift from AUXIN to VPWR. The voltage
headroom required is load dependent (see Figures 1 and 2). The
VSW preferentially uses AUXIN as its input source, but if AUXIN
is unable to supply adequate voltage, VPWR is selected as the
alternate input source. The VSW is capable of delivering up to
100mA continuously, depending on power dissipation and the
thermal environment in which the device is placed.
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ISL6719
ENABLE, ENABLE_N
The ENABLE and ENABLE_N are complementary inputs used to
turn VSW on and off. Both polarities of the enable function are
provided to ease the interface to the application. The VSW may
be enabled by either ENABLE or ENABLE_N, but both inputs
must be logically false to disable the output. Each enable input
has a nominal 100k pull-up resistor to 5V.
TRACE 1: VSW
TABLE 1. ENABLE, ENABLE_N TRUTH TABLE
INPUTS
TRACE 2: IVSW
FIGURE 6. VSW TRANSIENT RESPONSE, 10mA TO 100mA STEP,
VPWR = 18V, AUXIN = 15V, VSW = 12V
Figure 6 depicts the transient response of VSW during a 10mA
to 100mA step load when AUXIN is set to 15V and VPWR is set
to 18V.
VPWR
VPWR provides the source voltage for the IC and load until
AUXIN is back biased. VSW is disabled and the IC operates in a
standby (low power consumption) mode when UVLO is active.
If the application requires high currents or longer start-up
times than the thermal protection allows, the device
dissipation may be reduced by adding a resistor or resistors in
series between the input voltage and VPWR. The dropping
resistance must be selected such that VPWR remains above
the UVLO threshold of VPWR and at least 6.2V greater than
VSW under maximum load and minimum input voltage to
maintain regulation.
OUTPUT
ENABLE
ENABLE_N
VSW
0
0
ON
0
1
OFF
1
0
ON
1
1
ON
The inputs can accept voltages up to 6V maximum down to
0.3V below signal ground. Voltages beyond these limits,
including transients, may cause permanent damage to the
device. Care should be taken when connecting signal sources
through long connections or if significant ground shift could
occur between the source and the input. In such
circumstances, it is recommended that appropriate clamping
networks be used to prevent possible electrical overstress.
Over-Temperature Protection
The ISL6719 has an over-temperature shutdown mechanism
to protect the device from excessive dissipation. The VSW
shutdown occurs approximately at +150°C. The hysteresis is
large so that the IC has sufficient time to operate at start-up
loading levels without re-triggering the over-temperature
protection.
VIN
1 VPWR
GND 9
ENABLE 8
_N
2 AUXIN
ENABLE 7
3 VSW COMPB 6
COMPA 5
4 VSW_FB
FIGURE 7. ADDING DROPPING RESISTORS TO VPWR
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ISL6719
Dual Flat No-Lead Plastic Package (DFN)
L9.3x3
2X
9 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE
0.15 C A
A
D
MILLIMETERS
2X
0.15 C B
E
SYMBOL
MIN
0.80
0.90
1.00
-
-
-
0.05
-
0.20 REF
0.20
D
D2
B
A
C
SEATING
PLANE
1
6
0.30
4, 7
2.10
6, 7
-
3.00 BSC
0.80
e
0.08 C
2.00
0.95
6, 7
1.05
0.50 BSC
-
k
0.60
-
-
L
0.25
0.35
0.45
N
D2
7
9
2
Rev. 0 3/06
7
NOTES:
D2/2
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2
2. N is the number of terminals.
3. All dimensions are in millimeters. Angles are in degrees.
NX k
4. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
E2
5. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
(DATUM A)
E2/2
NX L
N
6. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
N-1
NX b
7
E2
A3
SIDE VIEW
(DATUM B)
5
INDEX
AREA
0.10 C
0.25
-
3.00 BSC
1.85
E
//
NOTES
A
b
TOP VIEW
MAX
A1
A3
5
INDEX
AREA
NOMINAL
e
(Nd-1)Xe
REF.
BOTTOM VIEW
4
0.10 M C A B
7. Nominal dimensions are provided to assist with PCB Land Pattern
Design efforts, see Intersil Technical Brief TB389.
8. COMPLIANT TO JEDEC MO-229-WEED-3 except for dimensions E2 &
D2.
CL
NX (b)
(A1)
8 L
4
e
SECTION "C-C"
C C
TERMINAL TIP
FOR ODD TERMINAL/SIDE
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in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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
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