PRODUCT DATASHEET
AAT2689
TM
SystemPower PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
VOUT1
C4
L1
3.3V/2.5A
U1
BST1
0.1μF
2
16
LX1
LX1
RS1
OS1
C8
4.7μH/5.3A
D1
BAS16
2
J1
330pF
12
1
15
4
C7
VL1
IN1
D2
R2
VIN1
6.0V - 24.0V
C6
2.2μF
220nF
2k
R6
R3
27.4k
open
1
R7
2k
R5
499
C9
C11 C12, C13
22μF 22μF open
EP2
IN1
5
14
AAT2689
3
2
3
9
8
7
6
EN1
EN1
FB1
R1 24.3k
1
+
VIN2
C3
56pF
C2
C1
C15
1μF
25V
IN2 COMP1
470pF
100μF
3
2
25V
VOUT2
R8
133k
R4
6.04k
10
C5
2.2μF
EN2 OUT2
1.8V/600mA
1
EP1
EN2
11
13
AGND GND
C10
2.2μF
C14
open
TDFN34-16
U1
C1
AAT2689 Analogic Technologies, Hi-Voltage Buck/LDO, TDFN34-16
Cap, MLC, 100μF/25V, Electrolytic cap
Cap, MLC, 2.2μF, 6.3V, 0805
C5, C6, C10
C4
Cap, MLC, 0.1μF/6.3V, 0603
C2, C3, C7, C8 Cap, MLC, misc., 0603
C9, C11
D1
D2
L1
R1 - R8
C15
Cap, MLC, 22μF/10V, 1206
BAS16, Generic, Rectifier, 0.2A/85V, Ultrafast, SOT23
B340A, Generic, Schottky Rectifier, 3A/40V, SMA
RCH108NP-4R7M, 4.7μF, ISAT = 5.3A, DCR = 11.7mΩ or Wurth 744 778 900 4, 4.7μH, ISAT = 3.9A, DCR = 35mΩ
Carbon film resistor, 0402
Cap, MLC,1μF/25V, 0603
Figure 4: AAT2689IRN Evaluation Board Schematic For VIN = 6V to 24V and VOUT = 3.3V.
Figure 5: AAT2689IRN Evaluation
Board Top Layer.
Figure 6: AAT2689IRN Evaluation
Board Bottom Layer.
w w w . a n a l o g i c t e c h . c o m
16
2689.2008.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
