AME5287 Datasheet, PDF (11/20 Pages) Analog Microelectronics – Rectified Step-Down Converter

AME
AME5287
n Typical Operating Circuit
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
VIN
2.5V to 5V
CIN
10µF
Chip Enable
C2
C₁
Optional
R₃
4
IN
L
5, 6
SW
3
EN
R₁
1
AME5287
8
COMP
FB
7
FREQ
2
GND
R_FREQ ^R2
GND ^{9 (Exposed pad)}
V OUT
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
V_OUT
R1
GND ²
GND
7 FREQ
GND
RFREQ
EN 3
V_IN
4
VIN
6 ^SW
SW
5 SW
SW pad should be
connected together to
Inductor by wide and short
trace, keep sensitive
components away from
this trace .
L1
C IN must be placed
between VIN and
GND as close as CIN
possible
Place the input and output
capacitors as close to the
IC as possible
C OUT ^VOUT
Figure 3. AME5287 Regulators Layout Diagram
Rev. A.01
11