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LTC3528-2 PDF даташит

Спецификация LTC3528-2 изготовлена ​​​​«Linear» и имеет функцию, называемую «2MHz Synchronous Step-Up DC/DC Converter».

Детали детали

Номер произв LTC3528-2
Описание 2MHz Synchronous Step-Up DC/DC Converter
Производители Linear
логотип Linear логотип 

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LTC3528-2 Даташит, Описание, Даташиты
FEATURES
n Delivers 3.3V at 200mA from a Single Alkaline/
NiMH Cell or 3.3V at 400mA from Two Cells
n VIN Start-Up Voltage: 700mV
n 0.50V to 5.5V Input Range
n 1.6V to 5.25V VOUT Range
n Up to 94% Efficiency
n Output Disconnect
n 2MHz Fixed Frequency Operation
n VIN > VOUT Operation
n Integrated Soft-Start
n Current Mode Control with Internal Compensation
n Burst Mode® Operation with 12µA Quiescent Current
n Internal Synchronous Rectifier
n Logic Controlled Shutdown: <1µA
n Anti-Ringing Control
n Low Profile (2mm × 3mm × 0.75mm) DFN Package
APPLICATIONS
n Medical Instruments
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
LTC3528-2
1A, 2MHz Synchronous
Step-Up DC/DC Converter
in 2mm × 3mm DFN
DESCRIPTION
The LTC®3528-2 is a synchronous, fixed frequency step-up
DC/DC converter with output disconnect. High efficiency
synchronous rectification, in addition to a 700mV start-
up voltage and operation down to 500mV once started,
provides longer run-time for single or multiple cell battery-
powered products.
A switching frequency of 2MHz minimizes solution foot-
print by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM is inter-
nally compensated, simplifying the design process. The
LTC3528-2 enters Burst Mode operation at light loads.
Anti-ringing circuitry reduces EMI by damping the induc-
tor in discontinuous mode. Additional features include a
low shutdown current, open-drain power good output,
short-circuit protection and thermal overload protection.
The LTC3528-2 is offered in an 8-lead 2mm × 3mm ×
0.75mm DFN package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
2.2µH
VIN
1.8V TO 3.2V
4.7µF
OFF ON
SW
VIN VOUT
LTC3528-2
PGOOD
SHDN
GND
FB
499k
287k
68pF
VOUT
3.3V
400mA
10µF
35282 TA01a
Efficiency and Power Loss
100
90
VOUT = 3.3V
VIN = 2.4V
80
EFFICIENCY
70
1000
100
60 10
50
40 1
POWER LOSS
30
20 0.1
10
0 0.01
0.01 0.1 1 10 100 1000
LOAD CURRENT (mA)
35282 TA01b
35282fb
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LTC3528-2 Даташит, Описание, Даташиты
LTC3528-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage.................................................... –0.3V to 6V
SW Voltage
DC............................................................. –0.3V to 6V
Pulsed < 100ns......................................... –0.3V to 7V
SHDN, FB Voltage......................................... –0.3V to 6V
VOUT.............................................................. –0.3V to 6V
PGOOD.......................................................... –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 5)............................................. –40°C to 125°C
Junction Temperature............................................ 125°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
SHDN 1
8 VIN
FB 2
PGOOD 3
9
7 SGND
6 PGND
VOUT 4
5 SW
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3528EDDB-2#PBF
LTC3528EDDB-2#TRPBF LDNZ
8-Lead (3mm × 2mm) Plastic DFN
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
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 1.2V, VOUT = 3.3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Range
Operating, Excluding Start-Up
l 0.5
5.5 V
Minimum Start-Up Voltage
Output Voltage Adjust Range
Feedback Voltage
ILOAD = 1mA
TA = 0°C to 85°C
(Note 7)
l
l 1.7
1.6
l 1.170
0.70
1.200
0.88
5.25
5.25
1.230
V
V
V
V
Feedback Input Current
Quiescent Current—Shutdown
Quiescent Current—Active
Quiescent Current—Burst
N-Channel MOSFET Switch Leakage Current
P-Channel MOSFET Switch Leakage Current
N-Channel MOSFET Switch On Resistance
VFB = 1.3V
VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V
Measured on VOUT, Nonswitching (Note 4)
Measured on VOUT , FB > 1.230V
VSW = 5V
VSW = 5V, VOUT = 0V
1
0.01
300
12
0.1
0.1
0.175
50
1
500
20
10
10
nA
µA
µA
µA
µA
µA
Ω
P-Channel MOSFET Switch On Resistance
0.250
Ω
N-Channel MOSFET Current Limit
l 1.0
1.5
A
Current Limit Delay Time to Output
(Note 3)
60 ns
Maximum Duty Cycle
VFB = 1.15V
l 87
92
%
35282fb
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LTC3528-2 Даташит, Описание, Даташиты
LTC3528-2
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 1.2V, VOUT = 3.3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Duty Cycle
Frequency
VFB = 1.3V
l0
l 1.8 2.0 2.4
%
MHz
SHDN Input High Voltage
0.88 V
SHDN Input Low Voltage
0.25 V
SHDN Input Current
PGOOD Threshold Percentage
VSHDN = 1.2V
Referenced to Feedback Voltage Falling
0.3 1
–7 –10 –13
µA
%
PGOOD Low Voltage
PGOOD Leakage Current
VIPOGUOTO=D
= 1mA
1.6V, IPGOOD
=
1mA
VPGOOD = 5.5V
0.05 0.1
0.05 0.2
0.01 1
V
V
µA
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: The LTC3528-2 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3528E-2 is guaranteed to meet specifications from 0°C to
85°C junction temperature. Specifications over –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. Note that the maximum
ambient temperature consistent with these specifications is determined by
specific operating conditions in conjunction with board layout, the rated
package thermal impedance and other environmental factors. The junction
temperature (TJ, in °C) is calculated from the ambient temperature (TA, in
°C) and power dissipation (PD, in Watts) according to the formula:
TJ = TA + (PD qJA)
where qJA = 76°C/W is the package thermal impedance.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current measurements are made when the output is not switching.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
76°C/W.
Note 7: The IC is tested in a feedback loop to make the measurement.
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)
Efficiency vs Load Current
and VIN for VOUT = 1.8V
100
90 EFFICIENCY
1000
80 100
70
60 10
50
POWER
LOSS
40 1
30
20
10
0
0.01
VIN = 1V 0.1
VIN = 1.2V
VIN = 1.5V 0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
35282 G01
Efficiency vs Load Current
and VIN for VOUT = 3V
100
EFFICIENCY
90
1000
80 100
70
60 10
50 POWER
LOSS
40 1
30
20
10
0
0.01
VIN = 1V 0.1
VIN = 1.5V
VIN = 2.4V 0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
35282 G26
35282fb
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