AME5282 Datasheet, PDF (12/21 Pages) Analog Microelectronics – Rectified Step-Down Converter

AME
AME5282
n Typical Operating Circuit
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
VIN
2.5V to 5V
CIN
10uF
Chip Enable
CC2
CC
Optional
R_C
L
4
IN
SW ^{5 , 6}
3
EN
R1
AME5282
1
COMP
8
FB
7
FREQ
2
GND
ROSC ^R2
GND ^{9 ( Exposed pad )}
VOUT
COUT
V_OUT(V)
3.3
2.5
1.8
1.5
1.2
1
C_IN(^µF)
10
10
10
10
10
10
R1(K^Ω
75
51
30
21
12
6
R2(K^Ω
24
24
24
24
24
24
R3(K^Ω
25
20
15
13
11
8.2
C1 pF
680
680
680
680
680
680
L(^µH)
2.2
2.2
1.5
1.5
1.5
1.5
Table 1. Recommended Components Selectin for fsw = 2MHz
C_OUT ^µF
22
22
22
22
22
22
R3
The ground area must provide adequate heat
dissipating area to the thermal pad andusing
Connect the
C1
multiple vias to help thermal dissipation.
FB pin directly
to feedback
R2 resistors.
COMP 1
8 FB
VOUT
R1
GND 2
GND
7 FREQ
GND
RFREQ
EN 3
VIN
4
V_IN
C _IN must be placed
between V IN and
GND as close as CIN
possible
6
5
Place the input and output
capacitors as close to the
IC as possible
SW
SW
SW
SW pad should be
connected together to
Inductor by wide and short
trace, keep sensitive
components away from
this trace.
L1
C_OUT ^VOUT
Figure 3. AME5282 Regulators Layout Diagram
12
Rev. A.02