AAT1150IKS-1.0-T1 AnalogicTech, AAT1150IKS-1.0-T1 Datasheet - Page 10

• Manufacturer Part Number: AAT1150IKS-1.0-T1
• Description: 1MHz 1A Step-Down DC/DC Converter
• Manufacturer: AnalogicTech

Power and Signal Source
Separate small signal ground and power supply
pins isolate the internal control circuitry from the
noise associated with the output MOSFET switch-
ing. The low pass filter R1 and C3 in schematic
Figures 1 and 2 filters the noise associated with the
power switching.
10
10μF
10μF
C1
C1
2.7V-5.5V
3.5V-5.5V
C2, C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME39L 0805 X5R
C1 Murata 10μF 6.3V X5R GRM42-6X 5R106K6.3
L1 Sumida CDRH5D18-4R1μH
C1 Murata 10μF 6.3V X5R GRM42-6X 5R106K6.3
L1 Sumida CDRH5D18-4R1μH
C2, C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805
R2
100k
0.1μF
100k
R1 100
R2
0.1μF
R1 100
C7
C7
VP
VCC
EN
SGND
AAT1150-1.5
VP
VCC
EN
SGND
AAT1150-3.3
RTN
RTN
PGND
PGND
FB
LX
LX
FB
LX
LX
Figure 2: 5V Input to 3.3V Output Converter.
Figure 1: Lithium-Ion to 1.5V Converter.
4.1μH
4.1μH
L1
L1
V
V
OUT
OUT
3.3V 1A
1.5V 1A
C2, C3, C4
3x 22μF
6.3V
C2, C3, C4
3x 22μF
6.3V
1MHz 1A Step-Down DC/DC Converter
Current Limit and Over-Temperature
Protection
For overload conditions, the peak input current is lim-
ited. Figure 3 displays the current limit characteris-
tics. As load impedance decreases and the output
voltage falls closer to zero, more power is dissipated
internally, raising the device temperature. Thermal
protection completely disables switching when inter-
nal dissipation becomes excessive, protecting the
device from damage. The junction over-temperature
threshold is 140°C with 15°C of hysteresis.
100
100
90
80
70
60
50
40
30
20
10
80
60
40
20
0
0
10
10
V
IN
= 5.0V
Efficiency vs. Output Current
2.7V
Efficiency vs. Output Current
3.6V
Output Current (mA)
Output Current (mA)
4.2V
(V
(V
OUT
OUT
= 3.3V)
100
100
= 1.5V)
AAT1150
1150.2006.09.1.5
1000
1000