參數(shù)資料
型號(hào)： TC115331EMTTR
廠商： Microchip Technology Inc.
英文描述： PFM/PWM Step-Up DC/DC Converter
中文描述： 烤瓷/ PWM升壓型DC / DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 2/14頁(yè)
文件大小： 355K
代理商： TC115331EMTTR
TC115
DS21361C-page 2
2003 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings
Power Supply Voltage (PS)...............................................12V
Power Dissipation ......................................................500 mW
LX Sink Current......................................................400 mA pk
SHDN Input Voltage..........................................................12V
Operating Temperature Range........................-40°C to +85°C
Storage Temperature Range.........................-40°C to +125°C
Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
PIN FUNCTION TABLE
DC CHARACTERISTICS
Symbol
Description
NC
Not connected
PS
Power and voltage sense input
SHDN
Shutdown input
LX
Inductor switch output
GND
Ground terminal
Electrical Specifications:
Unless otherwise noted, V
OUT
= 5V, T
A
= +25°C. Circuit configuration is illustrated in Figure 5-1.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Operating Supply Voltage
V
IN
0.9
—
10.0
V
Note 5
Start-Up Supply Voltage
V
START
I
LX
MAX
f
LIM
VLX
LIM
I
DD
I
CC
—
—
0.9
V
I
OUT
= 1 mA
LX Maximum Sink Current
—
—
350
mA
LX Limit Frequency
—
200
—
kHz
V
LX
= VLX
LIM
Note 2
LX Limit Voltage
0.7
—
1.3
V
No Load Supply Current
—
13
26
μA
I
OUT
= 0, V
IN
= V
OUT
x 0.8 (
Note 3
)
No external components,
V
IN
= (0.95 x V
OUT
) applied to PS (or
V
DD
) input
No external components,
V
IN
= (1.1 x V
OUT
) applied to PS
(or V
DD
) input
SHDN = 0V
Boost Mode Supply Current
—
80
135
μA
Standby Supply Current
I
STBY
—
9
17
μA
Shutdown Supply Current
I
SD
f
OSC
V
OUT
Rswon
—
—
0.5
μA
Oscillator Frequency
85
100
115
kHz
Note 2
,
Note 4
Output Voltage
V
R
x 0.975
—
V
R
1.4
V
R
x 1.025
2.4
V
%
V
IN
= 2.2V minimum (
Note 1
)
V
LX
= 0.4V
No external components
LX Output ON Resistance
Duty Cycle
(PFM Operating Mode)
PFMDUTY
10
17
25
Maximum Duty Cycle
MAXDUT
Y
80
87
92
%
Note 4
Soft Start Time
t
SS
h
4
10
20
msec
Efficiency
—
85
—
%
SHDN Input Logic High
V
IH
V
IL
0.75
—
—
V
SHDN Input Logic Low
—
—
0.20
V
Note
1:
2:
V
R
is the nominal factory-programmed output voltage setting.
VLX
LIM
is the voltage on the LX pin (with internal switch ON) that will cause the oscillator to run at twice nominal
frequency in to limit the switch current through the internal N-channel switching transistor.
Measured with D
1
= MA735 (reverse current < 1 μA at a reverse voltage of 10V).
With TC115 operating in PWM mode.
See Section 4.4, “Behavior When V
IN
is Greater Than the Factory-Programmed V
OUT
Setting”.
3:
4:
5:
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