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PDF AME5286 Data sheet ( Hoja de datos )
| Número de pieza | AME5286 | |
| Descripción | Rectified Step-Down Converter | |
| Fabricantes | AME | |
| Logotipo |  |
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AME
AME5286
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n General Description
n Typical Application
The AME5286 is a Synchronous Rectified Step-Down
Converter with internal power MOSFETs. It achieves 3A
continuous output current over a wide switching frequency
range with excellent load and line regulation.
Current mode operation provides fast transient response
and eases of loop stabilization. The circuit protection
includes cycle-by-cycle current limiting, output short cir-
cuit frequency protection and thermal shutdown. In shut-
down mode, the regulator reduces the current less than
1µA of supply current.
V IN
5V
CIN
10µF
P.G
C2
Optional
IN SW
R4
100KΩ
AME5286
PGOOD
EN
OFF ON
FB
SS
COMP FREQ
C1
680pF
GND
R3
25KΩ
RFREQ
18KΩ
L
2.2µH
R1
75KΩ
C3
0.1µF
VOUT
3.3V
COUT
22µF
R2
24KΩ
This device is available in SOP-8/PP and DFN-8C pack-
age with exposed pad for low thermal resistance.
n Features
l 3A Output Current
l External Soft Start
l Stable with Low ESR Output Ceramic
Capacitors
l Up to 95% Efficiency
l Less than 1µA Shutdown Current
l Wide Switching Frequency Range from
300KHz~2MHz
l Thermal Shutdown
l Cycle by Cycle Over Current Protection
l Output Adjustable from 0.8V to VIN
l Short Circuit Protection
l Available in SOP-8, DFN-8C Package
l RoHS Compliant and Halogen Free
Figure 1.
3.3V at 3A Step-Down Regulators
L
VIN 1.5µH
5V
IN SW
CIN
10µF
R4
100KΩ
AME5286
PGOOD
FB
EN
P.G OFF ON
SS
COMP FREQ
C2
Optional
C1
680pF
GND
R3
8.2KΩ
RFREQ
18KΩ
R1
6KΩ
C3
0.1µF
VOUT
1V
COUT
22µF
R2
24KΩ
Figure 2.
1V at 3 A Step-Down Regulators
n Applications
l TV
l Distributed Power Systems
l Pre-Regulator for Linear Regulators
Rev. A.02
1
1 page  
AME
AME5286
n Absolute Maximum Ratings
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
Parameter
Supply Voltage
Switch Voltage
EN, FB, COMP, FREQ to GND
ESD Classification
Symbol
VIN
VSW
HBM
MM
Maximum
-0.3V to +6V
-1.5V to VIN+0.7V
-0.3V to VIN+0.3V
2
200
Unit
V
V
V
kV
V
n Recommended Operating Conditions
Parameter
Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Symbol
TA
TJ
TSTG
Rating
-40 to +85
-40 to +125
-65 to +150
Unit
oC
n Thermal Information
Parameter
Package Die Attach Symbol Maximum Unit
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
SOP-8/PP
DFN-8C
SOP-8/PP
DFN-8C
Conductive Epoxy
θJC
θJA
15
8.2
oC / W
75
70
Internal Power Dissipation
SOP-8/PP
DFN-8C
Maximum Junction Temperature
Lead Temperature (Soldering 10sec)**
1.333
PD mW
1.429
150 oC
260 oC
* Measure θJC on backside center of molding compound if IC has no tab.
** MIL-STD-202G 210F
Rev. A.02
5
5 Page 
AME
AME5286
n Typical Operating Circuit
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
VIN
2.5V to 5V
CIN
10µF
R4
100KΩ
Chip Enable
C2
Optional
C1
R3
4
IN
SW 5
L
8
PGOOD
FB 7
3
AME5286
6
EN FREQ
RFREQ
1 COMP
GND 9 (Exposed pad)
SS 2
Css
V OUT
R1 COUT
R2
VOUT(V)
3.3
2.5
1.8
1.5
1.2
1
CIN(µF)
10
10
10
10
10
10
R1(KΩ
75
51
30
21
12
6
R2(KΩ
24
24
24
24
24
24
R3(KΩ
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
COUT µF
22
22
22
22
22
22
Rev. A.02
The ground area must provide adequate heat
dissipating area to the thermal pad and using
multiple vias to help thermal dissipati.on
R3
C1
GND
Css
COMP 1
SS 2
EN 3
GND
GND
9
8 PG
7 FB
6 FREQ
Place the feedback
R2 resistors as close to
the IC as possible
R1
VOUT
RFREQ
GND
CIN must be
placed
between V IN
and GND as
close as
possible
VIN 4
5 SW
CIN L1
COUT
GND
Place the input and output
capacitors as close to the IC as
possible
VOUT
SW should be
connected to inductor
by wide and short
trace , and keep
sensitive components
away from this trace
Figure 3. AME5286 Regulators Layout Diagram
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AME5286.PDF ] | |
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