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Linear Technology Electronic Components Datasheet

LT3587 Datasheet

High Voltage Monolithic Inverter and Dual Boost

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FEATURES
n Ideal for CCD, LCD, LED Backlight and OLED
Applications
n Easy Generation of 15V (50mA), –8V (100mA) and
20V (20mA) from a Li-Ion Cell
n VVIN Range: 2.5V to 6V
n Wide Output Ranges: Up to 32V for the Boosts and
Up to –32V for the Inverter
n Output Disconnect for the Boost Channels
n Boost3 Allows Voltage Programming and/or Current
Programming for a ‘One Wire Current Source’
n Overload Fault Protection with Fault I/O Pin Indicator
n Combined Soft-Start and Enable Pins
n Small 20-Pin 3mm × 3mm QFN Package
APPLICATIONS
n Digital Still and Video Cameras
n Scanner and Display Systems
n PDA, Cellular Phones and Handheld Computers
n LED Backlight and OLED Display Drivers
n CCD Imager Bias
n General High Voltage Supply Bias
LT3587
High Voltage Monolithic
Inverter and Dual Boost
DESCRIPTION
The LT®3587 provides a one chip solution for applications
requiring two positive and one negative high voltage sup-
plies. The LT3587 input voltage range of 2.5V to 6V makes
it ideal for various battery-powered systems.
A single resistor programs each of the three output voltage
levels and the output current of Boost3. The intelligent soft-
start allows for sequential soft-start of the Boost1 output
followed by the negative output with a single capacitor.
Internal sequencing circuitry also disables the inverter until
the Boost1 output has reached 87% of its final value.
The LT3587 integrates all the power switches, soft-start,
and output-disconnect circuits into a small 3mm × 3mm
QFN package. This high level of integration combined
with small external components makes the LT3587 ideal
for space constrained applications.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Li-Ion Powered Supply for CCD Imager and Six White Backlight LEDs
VVIN
2.5V TO 6V
1μF
2.2μF
8.06k
10μH
15μH
SW3
CAP3
IFB3
GND
VIN
LT3587
SW1
CAP1
VOUT1
FB1
10μF
1M
2.7pF
VVIN
2.5V TO 6V
EN/SS1
EN/SS3
FLT
SW2
15μH
2.2μF
VOUT3
VFB3
FB2
1M
6.8pF
15μH
CCD POSITIVE
15V, 50mA
LED DRIVER
20mA, UP TO 6 LEDS
22μF
CCD NEGATIVE
–8V, 100mA
3587 TA01a
Efficiency Curve
90 CDD+ = 50mA
85 CDD= 100mA
LED = 20mA
80
CDD+
75 ALL CHANNELS
ENABLED
70 CDD
65 LED
POWER DISSIPATION
60 ALL CHANNELS
ENABLED
55
800
700
600
500
400
300
200
100
50
0
0.5 1
NORMALIZED CURRENT
0
1.5
3587 TA01b
3587fc
1


Linear Technology Electronic Components Datasheet

LT3587 Datasheet

High Voltage Monolithic Inverter and Dual Boost

No Preview Available !

LT3587www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN ..............................................................................6V
Soft-Start Input Pins
EN/SS1, EN/SS3 .....................................................6V
Feedback Pins
FB1, FB2, IFB3, VFB3 ................................. –0.2V to 6V
High Voltage Switch Pins
SW1, SW2, SW3...................................................40V
High Voltage Output Pins
CAP1, CAP3, VOUT1, VOUT3 ...................................32V
Bidirectional I/O Pin
FLT ..........................................................................6V
FLT Current ........................................................10mA
Operating Junction Temperature Range.. –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
VOUT3
CAP3
20 19 18 17 16
1 15 FB1
2 14 VOUT1
SW3 3 21 13 CAP1
GND 4
12 GND
FLT 5
11 SW1
6 7 8 9 10
UD PACKAGE
20-LEAD (3mm s 3mm) PLASTIC QFN
θJA = 68°C/W, θJC = 4.2°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT3587EUD#PBF
LT3587EUD#TRPBF
LDNC
20-Lead (3mm × 3mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VVIN = 3.6V, VEN/SS1 = VEN/SS3 = VVIN unless otherwise noted (Note 2, 3).
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Operating Input Voltage Range
2.5 6 V
Quiescent Current
Switching Frequency
VEN/SS1 = 0V, VEN/SS3 = VVIN OR
VEN/SS1 = VVIN, VEN/SS3 = 0V OR
VEN/SS1 = VEN/SS3 = VVIN
Not Switching
VEN/SS1 = VEN/SS3 = 0V, In Shutdown
2.4 4
mA
5.5 9
l 0.8 1 1.2
μA
MHz
Maximum Duty Cycle
l 87
93
%
Minimum On Time
Power Fault Delay from Any Output to FLT
FLT Input Threshold Low
FLT Leakage Current
FLT Voltage Output Low
VFLT = 5V
IFLT = 1mA
50 70
16
l 0.4 1.0 1.6
l ±1
l 0.4
ns
ms
V
μA
V
3587fc
2


Part Number LT3587
Description High Voltage Monolithic Inverter and Dual Boost
Maker Linear Technology
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LT3587 Datasheet PDF






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