AAT2510IWP-IH-T1 AnalogicTech, AAT2510IWP-IH-T1 Datasheet - Page 9

• Manufacturer Part Number: AAT2510IWP-IH-T1
• Description: Dual 400mA, 1MHz Step-Down DC-DC Converter
• Manufacturer: AnalogicTech

Soft Start
The AAT2510 soft-start control prevents output
voltage overshoot and limits inrush current when
either the input power or the enable input is
applied. When pulled low, the enable input forces
the converter into a low-power, non-switching state
with a bias current of less than 1µA.
Low Dropout Operation
For conditions where the input voltage drops to the
output voltage level, the converter duty cycle
increases to 100%. As 100% duty cycle is
approached, the minimum off-time initially forces
the high side on-time to exceed the 1MHz clock
cycle and reduce the effective switching frequency.
Once the input drops below the level where the out-
put can be regulated, the high side P-channel
2510.2005.08.1.5
2.5V at 400mA
L1, L2 Sumida CDRH3D16-4R7 C1, C2 Murata GRM219R61A475KE19
V
IN
= 2.7 - 5.5V
Figure 1: AAT2510 Fixed Output.
C1
4.7µF
10µF
C3
4.7µH
L1
C3 Murata GRM21BR60J106KE19
12
11
10
1
2
3
VIN1
EN1
LX1
FB1
SGND1
GND1
U1
AAT2510
SGND2
GND2
VIN2
EN2
FB2
LX2
9
4
8
5
6
7
0.1µF
4.7µH
L2
C8
4.7µF
1.8V at 400mA
C2
Dual 400mA, 1MHz Step-Down DC-DC Converter
10µF
C1
V
1.8V
IN
100pF
Figure 2: AAT2510 Adjustable Output with
MOSFET is turned on continuously for 100% duty
cycle. At 100% duty cycle, the output voltage tracks
the input voltage minus the I*R drop of the high
side P-channel MOSFET R
Low Supply
The under-voltage lockout (UVLO) feature guaran-
tees sufficient V
internal circuitry prior to activation.
Fault Protection
For overload conditions, the peak inductor current is
limited. Thermal protection disables switching when
the internal dissipation or ambient temperature
becomes excessive. The junction over-temperature
threshold is 140°C with 15°C of hysteresis.
C4
118k
10µF
R1
C3
Enhanced Transient Response.
4.7µH
L1
R2
59.0k
12
11
10
1
2
3
VIN1
EN1
LX1
FB1
SGND1
GND1
IN
U1
AAT2510
bias and proper operation of all
SGND2
GND2
VIN2
EN2
FB2
LX2
9
4
8
5
6
7
DS(ON)
59.0k
R4
.
0.1µF
AAT2510
10µH
C8
L2
187k
100pF
R3
C5
2.5V
C2
10µF
9