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PDF AME5287 Data sheet ( Hoja de datos )
| Número de pieza | AME5287 | |
| Descripción | Rectified Step-Down Converter | |
| Fabricantes | AME | |
| Logotipo |  |
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AME
AME5287
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n General Description
The AME5287 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. Internal soft-start mini-
mizes the inrush supply current at startup. The circuit
protection includes cycle-by-cycle current limiting, out-
put short circuit frequency protection and thermal shut-
down. In shutdown mode, the regulator reduces the cur-
rent less than 1µA of supply current.
This device is available in SOP-8/PP ,DFN-8 package
with exposed pad for low thermal resistance.
n Typical Application
L
VIN 2.2µH
5V
IN SW
CIN
10µF
C2
Optional
EN
OFF ON AME5287
C1
680pF
R3
25KΩ
COMP
GND
FB
FREQ
RFREQ
18KΩ
R1
75KΩ
R2
24KΩ
VOUT
3.3V
COUT
22µF
Figure 1. 3.3V at 3A Step-Down Regulators.
n Features
l 3A Output Current
l Stable with Low ESR Output Ceramic
Capacitors
l Pre-Regulator for Linear Regulators
l Up to 95% Efficiency
l Less than 1µA Shutdown Current
l Wide Switching Frequency Range from
300KHz~2MHz
l Thermal Protection
l Cycle-by-Cycle Over Current Protection
l Output Adjustable from 0.8V to VIN
l Short Circuit Protection
l Green Products Meet RoHS Standards
VIN
3V~5V
CIN
10µF
C2
Optional
L
1.5µH
IN SW
EN
OFF ON
AME5287
R1
6KΩ
C1
680pF
R3
8.2KΩ
COMP
FB
GND
FREQ
RFREQ
18KΩ
R2
24KΩ
VOUT
1V
COUT
22µF
Figure 2. 1V at 3A Step-Down Regulators.
n Applications
l TV
l Distributed Power Systems
l Pre-Regulator for Linear Regulators
l Digital Cameras
Rev. A.01
1
1 page  
AME
AME5287
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
6
-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
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
SOP-8/PP
DFN-8C
SOP-8/PP
DFN-8C
SOP-8/PP
DFN-8C
Maximum Junction Temperature
Lead Temperature (soldering 10 sec)**
Die Attach Symbol Maximum
θJC
Conductive Epoxy
θJA
PD
15
8.2
75
70
1.333
1.429
150
260
Unit
oC / W
W
oC
oC
* Measure θJC on backside center of Exposed Pad.
** MIL-STD-202G 210F
Rev. A.01
5
5 Page 
AME
AME5287
n Typical Operating Circuit
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
VIN
2.5V to 5V
CIN
10µF
Chip Enable
C2
Optional
C1
R3
4
IN
3
EN
5, 6
SW
L
1 AME5287 8
COMP
FB
7
FREQ
2
GND
GND 9 (Exposed pad)
RFREQ
R1
R2
V OUT
COUT
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
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
VIN
4
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
Rev. A.01
Figure 3. AME5287 Regulators Layout Diagram
11
11 Page | ||
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| PDF Descargar | [ Datasheet AME5287.PDF ] | |
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