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Datasheet LTC3528-2 PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC3528-2
部品説明 2MHz Synchronous Step-Up DC/DC Converter
メーカ Linear
ロゴ Linear ロゴ 
プレビュー
Total 18 pages
		
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LTC3528-2 Datasheet, LTC3528-2 PDF,ピン配置, 機能
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 pdf, ピン配列
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
3


3Pages


LTC3528-2 電子部品, 半導体
LTC3528-2
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)
Fixed Frequency
Inductor Current
WVOaUvTefRoirpmpsle
and
Burst Mode Waveforms
VOUT
20mV/DIV
IL
200mA/DIV
VIN = 1.2V
VOUT = 3.3V
COUT = 10µF
CFF = 33pF
IOUT = 100mA
L = 2.2µH
500ns/DIV
VOUT
50mV/DIV
INDUCTOR
CURRENT
100mA/DIV
35282 G19
VIN = 3.6V
VOUT = 5V
COUT = 10µF
CFF = 33pF
ILOAD = 30mA
5µs/DIV
VOUT and IIN During Soft-Start
VOUT
1V/DIV
IIN
200mA/DIV
SHDN PIN
35282 G20
VIN = 1.2V
VOUT = 3.3V
COUT = 10µF
L = 2.2µH
200µs/DIV
35282 G21
Load Step Response (Fixed
Frequency, 3.6V to 5V)
Load Step Response (Burst Mode
Operation, 3.6V to 5V)
VOUT
100mV/DIV
LOAD
CURRENT
200mA/DIV
VIN = 3.6V
VOUT = 5V
COUT = 10µF
20µs/DIV
L = 2.2µH
LOAD CURRENT = 100mA TO 550mA
35282 G22
Load Step Response (Fixed
Frequency, 1.2V to 3.3V)
VOUT
100mV/DIV
LOAD
CURRENT
200mA/DIV
VIN = 3.6V
VOUT = 5V
COUT = 10µF
L = 2.2µH
20µs/DIV
LOAD CURRENT = 20mA TO 550mA
35282 G23
Load Step Response (Burst Mode
Operation, 1.2V to 3.3V)
VOUT
100mV/DIV
LOAD
CURRENT
100mA/DIV
VIN = 1.2V
VOUT = 3.3V
COUT = 10µF
L = 2.2µH
20µs/DIV
LOAD CURRENT = 20mA TO 170mA
35282 G24
VOUT
100mV/DIV
LOAD
CURRENT
100mA/DIV
VIN = 1.2V
VOUT = 3.3V
COUT = 10µF
20µs/DIV
L = 2.2µH
LOAD CURRENT = 10mA TO 160mA
35282 G25
35282fb
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