Reflow Peak Body Temperature (DFN) .................. 260°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
V
FB
1
V
IN
2
GND 3
7
6 RUN
5 MODE/
SYNC
4 SW
V
IN
1
GND 2
V
FB
3
6 SW
5 MODE/SYNC
4 RUN
DC PACKAGE
6-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 102°C/W,
θ
JC
= 20°C/W (SOLDERED TO A 4-LAYER BOARD, NOTE 3)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 215°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC3542EDC#PBF
LTC3542IDC#PBF
LTC3542ES6#PBF
LTC3542IS6#PBF
TAPE AND REEL
LTC3542EDC#TRPBF
LTC3542IDC#TRPBF
LTC3542ES6#TRPBF
LTC3542IS6#TRPBF
PART MARKING*
LCFR
LCFR
LCFS
LCFS
PACKAGE DESCRIPTION
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead (2mm
×
2mm) Plastic DFN
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–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 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/
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V unless otherwise noted.
SYMBOL
V
IN
I
FB
V
FB
ΔV
LINE_REG
ΔV
LOAD_REG
PARAMETER
Operating Voltage Range
Feedback Input Current
Feedback Voltage (Note 4)
Reference Voltage Line Regulation (Note 4) V
IN
= 2.5V to 5.5V
Output Voltage Load Regulation (Note 4)
I
LOAD
= 100mA to 500mA
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
●
MIN
2.5
0.588
TYP
MAX
5.5
±30
UNITS
V
nA
V
%/V
%
0.6
0.04
0.02
0.612
0.2
0.2
3542fa
2
LTC3542
ELECTRICAL CHARACTERISTICS
SYMBOL
I
S
PARAMETER
Input DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronous Frequency
Peak Switch Current
P-Channel On Resistance (Note 6)
N-Channel On Resistance (Note 6)
Switch Leakage Current
Undervoltage Lockout Threshold
RUN Threshold
RUN Leakage Current
MODE/SYNC Threshold
MODE/SYNC Leakage Current
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V unless otherwise noted.
CONDITIONS
V
FB
= 0.5V
V
FB
= 0.7V, MODE = 0V
RUN = 0V
V
FB
= 0.6V
V
FB
= 0.6V
V
IN
= 3V, V
FB
= 0.5V, Duty Cycle < 35%
I
SW
= 100mA
I
SW
= –100mA
V
IN
= 5V, V
RUN
= 0V, V
SW
= 0V or 5V
V
IN
Rising
V
IN
Falling
●
●
●
●
●
MIN
TYP
MAX
500
35
1
2.7
3
UNITS
μA
μA
μA
MHz
MHz
mA
Ω
Ω
μA
V
V
V
μA
V
μA
26
0.1
1.8
1
650
1000
0.5
0.35
±0.01
1.8
0.3
±0.01
0.3
±0.01
2.0
1.9
2.25
f
OSC
f
SYNC
I
LIM
R
DS(ON)
I
SW(LKG)
V
UVLO
V
RUN
I
RUN
V
MODE/SYNC
I
MODE/SYNC
0.65
0.55
±1
2.3
1.5
±1
1.2
±1
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. No pin should exceed 6V.
Note 2:
The LTC3542 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3542I is guaranteed over the full
–40°C to 125°C operating temperature range.
Note 3:
Failure to solder the Exposed Pad of the package to the PC board
will result in a thermal resistance much higher than 102°C/W.
Note 4:
The converter is tested in a proprietary test mode that connects
the output of the error amplifier to the SW pin, which is connected to an
external servo loop.
Note 5:
Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 6:
The DFN switch on resistance is guaranteed by correlation to wafer
当今的计算机外部设备，都在追求高速度和高通用性。为了满足用户的需求，以Intel为首的七家公司于1994年推出了USB（Universal Serial Bus，通用串行总线）总线协议，专用于低、中速的计算机外设。目前，USB端口已成为微机主板的标准端口；而在不久的将来，所有的微机外设，包括键盘、鼠标、显示器、打印机、数字相机、扫描仪和游戏柄等等，都将通过USB与主机相连。
...[详细]
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