TC1303A Datasheet, PDF (10/36 Pages) Microchip Technology – 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output

TC1303A/TC1303B/TC1303C/TC1304
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
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.
80
I_OUT1 = I_OUT2 = 0 mA
76
V_IN = 5.5V
72
68
SHDN1 = V_IN2
SHDN2 = V_IN2
V_IN = 4.2V
64
V_IN = 3.6V
60
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-1:
I_Q Switcher and LDO
Current vs. Ambient Temperature (TC1303A,B).
55
I_OUT2 = 0 mA
50
V_IN = 5.5V
45
V_IN = 3.6V
40
V_IN = 4.2V
35
SHDN1 = A_GND
SHDN2 = V_IN2
30
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-4:
Temperature.
I_Q LDO Current vs. Ambient
78
SHDN1 = V_IN2
76
SHDN2 = V_IN2
V_IN = 5.5V
74
V_IN = 4.2V
72
V_IN = 3.6V
70
68
66
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-2:
I_Q Switcher and LDO
Current vs. Ambient Temperature
(TC1303C, TC1304).
55
I_OUT1 = 0 mA
50
V_IN = 5.5V
SHDN1 = V_IN2
SHDN2 = A_GND
45
40
V_IN = 4.2V
35
V_IN = 3.6V
30
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-3:
I_Q Switcher Current vs.
Ambient Temperature.
100
95
90
I_OUT1 = 100 mA
85
SHDN1 = V_IN2
SHDN2 = A_GND
80
I_OUT1 = 250 mA
75
70
65
I_OUT1 = 500 mA
60
55
50
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Input Voltage (V)
FIGURE 2-5:
V_OUT1 Output Efficiency vs.
Input Voltage (V_OUT1 = 1.2V).
100
95
SHDN1 = V_IN2
SHDN2 = A_GND
90
85
80
V_IN1 = 4.2V
75
70
0.005 0.104 0.203
V_IN1 = 3.6V
V_IN1 = 3.0V
0.302 0.401 0.5
I_OUT1 (A)
FIGURE 2-6:
V_OUT1 Output Efficiency vs.
I_OUT1 (V_OUT1 = 1.2V).
DS21949B-page 10
© 2005 Microchip Technology Inc.