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LT3587EUD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3587
1
3587fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Voltage Monolithic
Inverter and Dual Boost
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 fi nal 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.
Li-Ion Powered Supply for CCD Imager and Six White Backlight LEDs
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
V
VIN
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
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
Effi ciency Curve
15µH
10µH
3587 TA01a
V
OUT3
CAP3
V
FB3
I
FB3
SW2
FB2
GND
CAP1
FB1
V
OUT1
LT3587
FLT
EN/SS1
EN/SS3
SW3 SW1V
IN
10µF
V
VIN
2.5V TO 6V
2.2µF
15µH15µH
CCD POSITIVE
15V, 50mA
CCD NEGATIVE
–8V, 100mA
8.06k
1µF
LED DRIVER
20mA, UP TO 6 LEDS
2.2µF
1M
1M
22µF
V
VIN
2.5V TO 6V
2.7pF
6.8pF
NORMALIZED CURRENT
0
EFFICIENCY (%)
POWER DISSIPATION (mW)
90
85
75
65
55
80
70
60
50
800
700
500
300
100
600
400
200
0
1
3587 TA01b
1.50.5
CDD
+
= 50mA
CDD
–
= 100mA
LED = 20mA
CDD
+
CDD
–
LED
ALL CHANNELS
ENABLED
POWER DISSIPATION
ALL CHANNELS
ENABLED
LT3587
2
3587fc
ABSOLUTE MAXIMUM RATINGS
V
IN
..............................................................................6V
Soft-Start Input Pins
EN/SS1, EN/SS3 .....................................................6V
Feedback Pins
FB1, FB2, I
FB3
, V
FB3
................................. –0.2V to 6V
High Voltage Switch Pins
SW1, SW2, SW3 ...................................................40V
High Voltage Output Pins
CAP1, CAP3, V
OUT1
, V
OUT3
...................................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
(Note 1)
20 19 18 17 16
7 8
TOP VIEW
21
UD PACKAGE
20-LEAD (3mm s 3mm) PLASTIC QFN
9
10
V
OUT3
CAP3
SW3
GND
FLT
FB1
V
OUT1
CAP1
GND
SW1
V
FB3
I
FB3
EN/SS3
V
IN
EN/SS1
FB2
GND
GND
SW2
NC
12
11
13
14
15
4
5
3
2
1
6
θ
JA
= 68°C/W, θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Voltage Range 2.5 6 V
Quiescent Current V
EN/SS1
= 0V, V
EN/SS3
= V
VIN
OR
V
EN/SS1
= V
VIN
, V
EN/SS3
= 0V OR
V
EN/SS1
= V
EN/SS3
= V
VIN
Not Switching
2.4 4 mA
V
EN/SS1
= V
EN/SS3
= 0V, In Shutdown 5.5 9 µA
Switching Frequency
l
0.8 1 1.2 MHz
Maximum Duty Cycle
l
87 93 %
Minimum On Time 50 70 ns
Power Fault Delay from Any Output to FLT 16 ms
FLT Input Threshold Low
l
0.4 1.0 1.6 V
FLT Leakage Current V
FLT
= 5V
l
±1 µA
FLT Voltage Output Low I
FLT
= 1mA
l
0.4 V
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3587EUD#PBF LT3587EUD#TRPBF LDNC
20-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
PIN CONFIGURATION
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
VIN
= 3.6V, V
EN/SS1
= V
EN/SS3
= V
VIN
unless otherwise noted (Note 2, 3).
LT3587
3
3587fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
VIN
= 3.6V, V
EN/SS1
= V
EN/SS3
= V
VIN
unless otherwise noted (Note 2, 3).
PARAMETER CONDITIONS MIN TYP MAX UNITS
Boost1
CAP1 Bias Current V
CAP1
= 15V, V
OUT1
= Open 60 150 µA
FB1 Reference Voltage
l
1.19 1.22 1.25 V
V
OUT1
Output Voltage R
FB1
= 1M
l
14.25 15 15.75 V
SW1 Current Limit 800 990 mA
SW1 V
CESAT
I
SW1
= 400mA 200 mV
SW1 Leakage Current V
SW1
= 15V 0.1 5 µA
EN/SS1 for Full Inductor Current V
FB1
= 1.1V, V
FB2
= 0.1V 2.5 V
EN/SS1 Shutdown Voltage Threshold
l
0.2 V
EN/SS1 Pin Bias Current V
EN/SS1
= 0V –0.5 –1 –1.5 µA
V
OUT1
Current Limit V
CAP1
= 15V 100 155 mA
CAP1 to V
OUT1
On-Resistance (R
DISC1
)V
CAP1
= 15V, I
VOUT1
= 50mA 5 8
V
OUT1
Disconnect Leakage V
VIN
= V
CAP1
= 6V, V
VOUT1
= 0V 0.1 1 µA
Inverter
FB2 Reference Voltage
l
–10 5 20 mV
Output Voltage R
FB2
= 1MΩ
l
–7.5 –8 –8.5 V
SW2 Current Limit 900 1090 mA
SW2 V
CESAT
I
SW2
= 600mA 250 mV
SW2 Leakage Current V
SW2
= 15V 0.1 5 µA
FB1 Threshold to Start Negative Channel Percent of Final Regulation Value 87 90 %
Boost3
CAP3 Bias Current V
CAP3
= 15V, V
OUT3
= Open 70 150 µA
Boost3 Programmed Current R
IFB3
= 8.06kΩ
l
18 20 22 mA
V
FB3
Reference Voltage R
VFB3
= 1MΩ, I
VOUT3
= 20mA
l
0.77 0.8 0.83 V
V
OUT3
Output Voltage R
VFB3
= 1MΩ, I
VOUT3
= 20mA
l
14 15 16 V
SW3 Current Limit 400 480 mA
SW3 V
CESAT
I
SW3
= 200mA 250 mV
SW3 Leakage Current V
SW3
= 15V 0.1 5 µA
EN/SS3 for Full Inductor Current V
VFB3
= V
IFB3
= 0.6V 2 V
EN/SS3 Shutdown Voltage Threshold
l
0.2 V
EN/SS3 Pin Bias Current V
EN/SS3
= 0V –0.5 –1 –1.5 µA
V
OUT3
Current Limit V
CAP3
= 15V, V
IFB3
= 0V 70 110 mA
CAP3 to V
OUT3
On Resistance (R
DISC3
)V
CAP3
= 15V, I
VOUT3
= 20mA 10 15 Ω
V
OUT3
Disconnect Leakage V
VIN
= V
CAP3
= 6V, V
VOUT3
= 0V 0.1 1 µA
CAP3 Pin Overvoltage Clamp 27 29 31 V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3: The LT3587 is guaranteed to meet specifi ed performance from
0°C to 125°C. Specifi cations over the –40°C to 125°C operating range are
assured by design, characterization and correlation with statistical process
controls.
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LT3587EUD#TRPBF

Mfr. #:
Buy LT3587EUD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi V Mono Inverter & 2x Boost
Lifecycle:
New from this manufacturer.
Delivery:
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