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TC115331ECT Datasheet(PDF) 2 Page - Microchip Technology

No. de pieza TC115331ECT
Descripción Electrónicos  PFM/PWM Step-Up DC/DC Converter
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC115331ECT Datasheet(HTML) 2 Page - Microchip Technology

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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, VOUT = 5V, TA = +25°C. Circuit configuration is illustrated in Figure 5-1.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Operating Supply Voltage
VIN
0.9
10.0
V
Note 5
Start-Up Supply Voltage
VSTART
——
0.9
V
IOUT = 1 mA
LX Maximum Sink Current
ILXMAX
——
350
mA
LX Limit Frequency
fLIM
—200
—kHz
VLX = VLXLIM
LX Limit Voltage
VLXLIM
0.7
1.3
V
Note 2
No Load Supply Current
IDD
—13
26
µA
IOUT = 0, VIN = VOUT x 0.8 (Note 3)
Boost Mode Supply Current
ICC
80
135
µA
No external components,
VIN = (0.95 x VOUT) applied to PS (or
VDD) input
Standby Supply Current
ISTBY
9
17
µA
No external components,
VIN = (1.1 x VOUT) applied to PS
(or VDD) input
Shutdown Supply Current
ISD
——
0.5
µA
SHDN = 0V
Oscillator Frequency
fOSC
85
100
115
kHz
Note 2, Note 4
Output Voltage
VOUT
VR x 0.975
VR
VR x 1.025
V
VIN = 2.2V minimum (Note 1)
LX Output ON Resistance
Rswon
1.4
2.4
VLX = 0.4V
Duty Cycle
(PFM Operating Mode)
PFMDUTY
10
17
25
%
No external components
Maximum Duty Cycle
MAXDUT
Y
80
87
92
%
Note 4
Soft Start Time
tSS
410
20
msec
Efficiency
h
85
%
SHDN Input Logic High
VIH
0.75
V
SHDN Input Logic Low
VIL
0.20
V
Note 1:
VR is the nominal factory-programmed output voltage setting.
2:
VLXLIM 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.
3:
Measured with D1 = MA735 (reverse current < 1 µA at a reverse voltage of 10V).
4:
With TC115 operating in PWM mode.
5:
See Section 4.4, “Behavior When VIN is Greater Than the Factory-Programmed VOUT Setting”.


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