TC1303B Datasheet, PDF (12/30 Pages) Microchip Technology – 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output

TC1303B
Note: Unless otherwise indicated, V_IN1 = V_IN2 = SHDN1,2 = 3.6V, C_OUT1 = C_IN = 4.7 µF, C_OUT2 = 1 µF, L = 4.7 µH,
V_OUT1 (ADJ) = 1.8V, T_A = +25°C. Boldface specifications apply over the T_A range of -40°C to +85°C. T_A = +25°C. Adjustable or fixed
output voltage options can be used to generate the Typical Performance Characteristics.
0.30
0.25
0.20
0.15
0.10
0.05
I_OUT2 = 300 mA
I_OUT2 = 200 mA
SHDN1 = A_GND
SHDN2 = V_IN2
Ambient Temperature (°C)
FIGURE 2-25:
V_OUT2 Dropout Voltage vs.
Ambient Temperature (V_OUT2 = 2.5V).
0.1
V_IN2 = 3.6V
0.0
-0.1
-0.2
-0.3
-0.4
V_OUT2 = 3.3V
SHDN1 = A_GND
SHDN2 = V_IN2
V_OUT2 = 1.5V
V_OUT2 = 2.6V
Ambient Temperature (°C)
FIGURE 2-28:
V_OUT2 Load Regulation vs.
Ambient Temperature.
0.3
SHDN1 = A_GND
SHDN2 = V_IN2
0.2
I_OUT2 = 300 mA
0.1
I_OUT2 = 200 mA
0.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-26:
V_OUT2 Dropout Voltage vs.
Ambient Temperature (V_OUT2 = 3.3V).
0.005
0.000
V_OUT2 = 3.3V
SHDN1 = A_GND
SHDN2 = V_IN2
-0.005
-0.010
-0.015
V_OUT2 = 2.5V
I_OUT2 = 100 µA
-0.020
-0.025
-0.030
V_OUT2 = 1.5V
-0.035
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-27:
V_OUT2 Line Regulation vs.
Ambient Temperature.
350
325
V_IN = 3.6V
SHDN1 = V_IN2
SHDN2 = V_IN2
300
275
250
225
200
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient temperature (°C)
FIGURE 2-29:
PG Active Delay Time-out
vs. Ambient Temperature.
96
V_IN = 3.6V
95
94
PG Threshold Hi
SHDN1 = V_IN2
SHDN2 = V_IN2
93
92
PG Threshold Low
91
90
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-30:
PG Threshold Voltage vs.
Ambient Temperature.
DS21949A-page 12
© 2005 Microchip Technology Inc.