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TC1303B-CJ0EMFTR データシート(PDF) 5 Page - Microchip Technology

部品番号 TC1303B-CJ0EMFTR
部品情報  500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21949A-page 5
TC1303B
Synchronous Buck Regulator (VOUT1)
Adjustable Output Voltage Range
VOUT1
0.8
4.5
V
Adjustable Reference Feedback
Voltage (VFB1)
VFB1
0.78
0.8
0.82
V
Feedback Input Bias Current
(IFB1)
IVFB1
-1.5
nA
Output Voltage Tolerance Fixed
(VOUT1)
VOUT1
-2.5
±0.3
+2.5
%
Note 2
Line Regulation (VOUT1)VLINE-REG
—0.2
%/V
VIN =VR+1V to 5.5V,
ILOAD = 100 mA
Load Regulation (VOUT1)VLOAD-REG
—0.2
%
VIN =VR +1.5V, ILOAD = 100 mA to
500 mA (Note 1)
Dropout Voltage VOUT1
VIN – VOUT1
280
mV
IOUT1 = 500 mA, VOUT1 =3.3V
(Note 5)
Internal Oscillator Frequency
FOSC
1.6
2.0
2.4
MHz
Start Up Time
TSS
—0.5
ms
TR = 10% to 90%
RDSon P-CHANNEL
RDSon-P
450
650
m
Ω
IP=100 mA
RDSon N-CHANNEL
RDSon-N
450
650
m
Ω
IN=100 mA
LX Pin Leakage Current
ILX
-1.0
±0.01
1.0
μA
SHDN = 0V, VIN = 5.5V, LX = 0V,
LX = 5.5V
Positive Current Limit Threshold
+ILX(MAX)
700
mA
LDO Output (VOUT2)
Output Voltage Tolerance (VOUT2)VOUT2
-2.5
±0.3
+2.5
%
Note 2
Temperature Coefficient
TCVOUT
25
ppm/°C
Note 3
Line Regulation
ΔVOUT2/
ΔVIN
-0.2
±0.02
+0.2
%/V
(VR+1V) ≤ VIN ≤ 5.5V
Load Regulation, VOUT2 ≥ 2.5V
ΔVOUT2/
IOUT2
-0.75
0.1
+0.75
%IOUT2 = 0.1 mA to 300 mA (Note 4)
Load Regulation, VOUT2 < 2.5V
ΔVOUT2/
IOUT2
-0.90
0.1
+0.90
%IOUT2 = 0.1 mA to 300 mA (Note 4)
Dropout Voltage VOUT2 > 2.5V
VIN – VOUT2
137
205
300
500
mV
IOUT2 = 200 mA (Note 5)
IOUT2 = 300 mA
Power Supply Rejection Ratio
PSRR
62
dB
f
≤ 100 Hz, IOUT1 = IOUT2 = 50 mA,
CIN = 0 µF
Output Noise
eN
1.8
µV/(Hz)½
f
≤ 1 kHz, IOUT2 =50 mA,
SHDN1 =GND
Output Short Circuit Current
(Average)
IOUTsc2
240
mA
RLOAD2 ≤ 1Ω
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN1 =VIN2 = SHDN1,2 =3.6V, COUT1 =CIN = 4.7 µF, COUT2 =1µF, L =4.7 µH, VOUT1 (ADJ) = 1.8V,
IOUT1 = 100 ma, IOUT2 = 0.1 mA TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Note
1:
The Minimum VIN has to meet two conditions: VIN ≥ 2.7V and VIN ≥ VRX + VDROPOUT, VRX = VR1 or VR2.
2:
VRX is the regulator output voltage setting.
3:
TCVOUT2 = ((VOUT2max – VOUT2min) * 10
6)/(V
OUT2 * DT).
4:
Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested
over a load range from 0.1 mA to the maximum specified output current.
5:
Dropout voltage is defined as the input to output voltage differential at which the output voltage drops 2% below its
nominal value measured at a 1V differential.
6:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction
temperature and the thermal resistance from junction to air. (i.e. TA, TJ, θJA). Exceeding the maximum allowable power
dissipation causes the device to initiate thermal shutdown.
7:
The integrated MOSFET switches have an integral diode from the LX pin to VIN, and from LX to PGND. In cases where
these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not
able to limit the junction temperature for these cases.
8:
VIN1 and VIN2 are supplied by the same input source.


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