AAT2514_08 ANALOGICTECH [Advanced Analogic Technologies], AAT2514_08 Datasheet - Page 7

• Manufacturer Part Number: AAT2514_08
• Description: Dual Channel 600mA Step-Down Converter
• Manufacturer: ANALOGICTECH [Advanced Analogic Technologies]

Functional Block Diagram
Functional Description
The AAT2514 is a dual high performance 600mA, 1.5MHz
fixed frequency monolithic switch-mode step-down con-
verter which uses current mode architecture with an
adaptive slope compensation scheme. It minimizes exter-
nal component size and optimizes efficiency over the com-
plete load range. The adaptive slope compensation allows
the device to remain stable over a wider range of inductor
values so that smaller values (1μH to 4.7μH) with associ-
ated lower DCR can be used to achieve higher efficiency.
Apart from the small bypass input capacitor, only a small
L-C filter is required at each output. The adjustable out-
puts can be programmed with external feedback to any
SwitchReg
SwitchReg
2514.2008.02.1.1
2514.2008.02.1.1
EN1
EN2
FB1
FB2
10
2
9
1
TM
TM
650mV
Reference
600mV
Bandgap
+
-
+
OVDET
-
EA
Overtemperature
and Shortcircuit
Protection
REGULATOR 2 (Same as Regulator 1)
+
-
I
COMP
OSC
w w w . a n a l o g i c t e c h . c o m
w w w . a n a l o g i c t e c h . c o m
Slope Comp
R
S _Q
Dual Channel 600mA Step-Down Converter
Dual Channel 600mA Step-Down Converter
Q
voltage, ranging from very low output voltages to the
input voltage and by using an internal reference of 0.6V.
The part uses internal MOSFETs for each channel to
achieve high efficiency. At dropout, the converter duty
cycle increases to 100% and the output voltages track
the input voltage minus the low R
P-channel high-side MOSFETs. The converter efficiency
has been optimized for all load conditions, ranging from
no load to 600mA at V
from 2.5V to 5.5V. The internal error amplifier and com-
pensation provides excellent transient response, load,
and line regulation. Internal soft start eliminates any
output voltage overshoot when the enable or the input
voltage is applied.
Counter
PWM
Logic
POR
Overlap
Control
Non-
PRODUCT DATASHEET
PRODUCT DATASHEET
IN
I
SENSE
AMP
= 3V with an input voltage range
I
COMP
ZERO
-
+
Regulator 1
+
-
AAT2514
AAT2514
DS(ON)
4
8
3
7
drop of the
POR
LX2
LX1
IN
7
7