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LT3999EMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT3999
1
3999fa
For more information www.linear.com/LT3999
TYPICAL APPLICATION
FEATURES DESCRIPTION
Low Noise, 1A, 1MHz
Push-Pull DC/DC Driver
with Duty Cycle Control
The LT
®
3999 is a monolithic, high voltage, high frequency
DC/DC transformer driver providing isolated power in a
small solution footprint.
The LT3999 has two 1A current limited power switches
that switch out of phase. The duty cycle is programmable
to adjust the output voltage. The switching frequency is
programmed
up to 1MHz and can be synchronized to an
external clock for more accurate placement of switcher
harmonics. The input operating range is programmed
with the precision undervoltage and overvoltage lockouts.
The supply current is reduced to less than 1µA during
shutdown. A user-defined RC time constant provides an
adjustable soft-start capability by limiting the inrush cur-
rent at start-up.
The LT3999 is available
in a 10-lead MSOP and 3mm ×
3mm DFN package with exposed pad.
12V to 12V, 10W Low Noise Isolated DC/DC Converter
LT3999 Line Regulation with
Duty Cycle Control
APPLICATIONS
n
Wide Input Operating Range: 2.7V to 36V
n
Dual 1A Switches with Programmable Current Limit
n
Programmable Switching Frequency: 50kHz to 1MHz
n
Frequency Synchronization Up to 1MHz
n
∆V
IN
Compensation Using Duty Cycle Control
n
Low Noise Topology
n
Programmable Input Over and Undervoltage Lockout
n
Cross Conduction Prevention Circuitry
n
Programmable Soft-Start
n
Low Shutdown Current: <1µA
n
10-Lead MSOP and DFN Packages
n
Low Noise Isolated Supplies
n
Medical Instrument and Safety
n
Distributed Power
n
Multiple Output Supplies
n
Positive-to-Negative Supplies
n
Noise Immunity in Data Acquisition, RS232
andRS485
L, LT, LTC , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
V
IN
SYNC
UVLO
OVLO/DC
RDC
LT3999
SWA
10µF
16V
15.3µH
V
OUT
12V
0.8A
• •
• •
V
IN
12V
SWB
GND
49.9k0.1µF
28k
500kHz
10k
15.8k
10µF
16V
255k
3999 TA01a
RT
ILIM/SS
RBIAS
INPUT VOLTAGE (V)
10
OUTPUT VOLTAGE (V)
12
14
18
3999 TA01b
10
8
12
14
16
11
13
15
17
16
11
13
9
15
I
OUT
= 200mA
I
OUT
= 800mA
I
OUT
= 400mA
LT3999
2
3999fa
For more information www.linear.com/LT3999
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
SWA, SWB ................................................. –0.3V to 80V
V
IN
, UVLO .................................................. –0.3V to 60V
OVLO/DC, SYNC
......................................... –0.3V to 8V
Operating Junction Temperature Range (Note 2)
LT3999E ............................................ –40°C to 125°C
LT3999I ............................................. –40°C to 125°C
LT3999H ............................................–40°C to 150°C
LT3999MP ......................................... –55°C to 150°C
(Note 1)
1
2
3
4
5
SWA
RBIAS
V
IN
UVLO
OVLO/DC
10
9
8
7
6
SWB
ILIM/SS
SYNC
RT
RDC
TOP VIEW
11
GND
MSE PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 40°CW, θ
JC
= 10°CW
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
11
GND
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
SWB
ILIM/SS
SYNC
RT
RDC
SWA
RBIAS
V
IN
UVLO
OVLO/DC
θ
JA
= 43°C/W, θ
JC
= 5.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3999EMSE#PBF LT3999EMSE#TRPBF LTGKR 10-Lead Plastic MSOP –40°C to 125°C
LT3999IMSE#PBF LT3999IMSE#TRPBF LTGKR 10-Lead Plastic MSOP –40°C to 125°C
LT3999HMSE#PBF LT3999HMSE#TRPBF LTGKR 10-Lead Plastic MSOP –40°C to 150°C
LT3999MPMSE#PBF LT3999MPMSE#TRPBF LTGKR 10-Lead Plastic MSOP –55°C to 150°C
LT3999EDD#PBF LT3999EDD#TRPBF LGKQ 10-Lead (3mm × 3mm) Plastic
DFN –40°C to 125°C
LT3999IDD#PBF LT3999IDD#TRPBF LGKQ 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard 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/
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ...............................................................300°C
LT3999
3
3999fa
For more information www.linear.com/LT3999
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply and Shutdown
V
IN
Minimum Operating Voltage
l
2.7 V
V
IN
Overvoltage Lockout Internal, Rising
l
36 40 42 V
V
IN
Supply Current (Note 3) 4.3 mA
V
IN
Shutdown Current V
UVLO
= 0.3V 0.1 1 μA
UVLO Threshold (Rising)
l
1.15 1.25 1.35 V
UVLO Hysteresis 125 mV
UVLO Pin Current V
UVLO
= 1.25V 10 100 nA
OVLO/DC Threshold (Rising)
l
1.15 1.25 1.35 V
OVLO/DC Hysteresis 125 mV
OVLO/DC Pin Current V
OVLO/DC
= 1.25V 10 100 nA
Power Switches (SWA, SWB
)
Switch Saturation Voltage I
SW
= 1A 350 mV
Switch Current Limit Internal Default
l
1.0 1.4 1.7 A
Non Overlap Time 70 ns
Switch Base Drive Current I
SW
= 1A 35 mA
Oscillator/Sync
Switching Frequency R
T
= 316k
R
T
= 49.9k
R
T
= 12.1k
l
280
50
300
1000
320
kHz
kHz
kHz
Synchronization Frequency Range 100 1000 kHz
SYNC Voltage Threshold 1.5 V
SYNC Pin Input Resistance 200 kΩ
ILIM/SS
SWA and SWB Current Limit R
ILIM/SS
= 43.2k
l
0.4 0.5 0.6 A
ILIM/
SS Pin Current 10 μA
Duty Cycle
Switch Duty Cycle OVLO/DC = 0.8V, R
DC
= 24.3k, R
T
= 49.9k
OVLO/DC = 0.612V, R
DC
= 24.3k, R
T
= 49.9k
OVLO/DC = 0.3V, R
DC
= 24.3k, R
T
= 49.9k
l
22
20
25
48
30
%
%
%
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 the device
reliability and lifetime.
Note 2: The LT3999E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3999I Is guaranteed over the –40°C to 125°C operating junction
temperature range. The LT3999H is guaranteed over the full –40°C
to
150°C operating junction temperature range. The LT3999MP is 100%
tested and guaranteed over the –55°C to 150°C junction temperature
range. High junction temperatures degrade operating lifetimes; operating
lifetime is derated for junction temperatures greater than 125°C.
Note 3: Supply current specification does not include switch drive
currents. Actual supply currents will be higher.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT3999EMSE#PBF

Mfr. #:
Buy LT3999EMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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