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PDF AME5283 Data sheet ( Hoja de datos )
| Número de pieza | AME5283 | |
| Descripción | Rectified Step-Down Converter | |
| Fabricantes | AME | |
| Logotipo |  |
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AME
AME5283
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n General Description
n Typical Application
The AME5283 is a Synchronous Rectified Step-Down
Converter with internal power MOSFETs. It achieves 2A
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.
This device is available in SOP-8/PP and DFN-8C pack-
age with exposed pad for low thermal resistance.
L
VIN 2.2uH
5V
IN SW
CIN
10uF
R4
100KΩ
AME5283
PGOOD
FB
EN
OFF ON
SS
P.G COMP FREQ
R1
75KΩ
C3
C2
Optional
C1
680pF
GND
0.1uF
R3
25KΩ
RFREQ
18KΩ
VOUT
3.3V
COUT
22uF
R2
24KΩ
n Features
l 2A 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
L
VIN 1.5uH
5V
IN SW
CIN
10uF
R4
100KΩ
AME5283
PGOOD
FB
P.G OFF ON EN
SS
COMP FREQ
C2
Optional
C1
680pF
GND
R3
8.2 KΩ
RFREQ
18KΩ
R1
6KΩ
C3
0.1uF
V OUT
1V
COUT
22uF
R2
24KΩ
n Applications
l TV
l Distributed Power Systems
l Pre-Regulator for Linear Regulators
Rev. A.03
1
1 page  
AME
AME5283
n Absolute Maximum Ratings
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
Parameter
Supply Voltage
Switch Voltage
EN, FB, COMP, FREQ to GND
ESD Classification
Symbol
V IN
V SW
HBM
MM
Maximum
-0.3V to +6V
-1.5V to VI N+0.7V
-0.3V to VI N+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.03
5
5 Page 
AME
AME5283
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n Typical Operating Circuit
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
EN
AME5283
6
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
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. AME5283 Regulators Layout Diagram
Rev. A.03
11
11 Page | ||
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| PDF Descargar | [ Datasheet AME5283.PDF ] | |
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