AME
AME5283
n
General Description
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.
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n
Typical Application
V
IN
5V
C
IN
10uF
R4
100KΩ
L
2.2uH
IN
SW
R1
75KΩ
V
OUT
3.3V
C
OUT
22uF
AME5283
PGOOD
EN
COMP
FB
SS
FREQ
P.G
OFF ON
C
2
Optional
C1
680pF
R3
25KΩ
GND
RFREQ
18KΩ
C3
0.1uF
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 V
IN
l
Short Circuit Protection
l
Available in SOP-8, DFN-8C Package
l
RoHS Compliant and Halogen Free
C
2
Optional
C1
680pF
R3
8.2KΩ
C
IN
10uF
V
IN
5V
R4
100KΩ
P.G OFF ON
IN
SW
L
1.5uH
V
OUT
1V
R1
6KΩ
FB
SS
FREQ
C3
0.1uF
C
OUT
22uF
AME5283
PGOOD
EN
COMP
GND
RFREQ
18KΩ
R2
24KΩ
n
Applications
l
TV
l
Distributed Power Systems
l
Pre-Regulator for Linear Regulators
Rev. A.03
1
AME
AME5283
n
Functional Block Diagram
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
IN
CURRENT
SENSE
EN
ENABLE
UVLO
CURRENT
LIMIT
FREQ
OSC
SLOPE
COMP
0.8V
FB
EA
Hiccup
+
+
LOGIC
PWM
DRIVER
SW
10uA
SS
0.7V
0.4V
PGOOD
GND
n
Pin Configuration
SOP-8/PP
Top View
8
7
6
5
AME5283
9
1
2
3
4
Note. Connect exposed pad (heat sink on the back) to GND.
2
+
-
+
-
IRCMP
PG
-
+
OTP
PGND
UV
DFN-8C
(3mmx3mmx0.75mm)
Top View
AME5283-AZAADJ
1. COMP
2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND (Exposed Pad)
* Die Attach:
Conductive Epoxy
1
2
3
4
8
7
6
5
AME5283-AVAADJ
1. COMP
2. SS
3. EN
AME 5283
9
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND (Exposed Pad)
* Die Attach:
Conductive Epoxy
Rev. A.03
AME
AME5283
n
Pin Description
Pin No.
Pin Name
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
Pin Description
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation
control loop. In some cases, an additional capacitor from COMP to GND is
required.
Soft-Start function. Connect a capacitor from SS to GND to set the soft-start
period.
Enable. Pull EN below 0.6V to shut down the regulator.
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Bypass IN to GND with a suitable large capacitor to eliminate noise on
the input to the IC.
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load.
Frequency Adjust Pin. Add a resistor from this pin to ground determines the
switching frequency.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB
with a resistive voltage divider from the output voltage. The feedback reference
voltage is 0.8V.
Power-Good output.
This open-drain output is low when output is out of regulation.
Ground. Connect the exposed pad to GND.
1
COMP
2
3
SS
EN
4
IN
5
6
SW
FREQ
7
FB
8
9
PG
GND
Rev. A.03
3
AME
AME5283
n
Ordering Information
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
Package
Type
V: DFN
Z: SOP/PP
Number of
Pins
A: 8
Output Voltage
A
(SOP-8/PP)
1. COMP
2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND
1. COMP
2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND
ADJ: Adjustable
A
(DFN-8C)
4
Rev. A.03
AME
AME5283
n
Absolute Maximum Ratings
Parameter
Supply Voltage
Switch Voltage
EN, FB, COMP, FREQ to GND
HBM
ESD Classification
MM
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
Symbol
V
IN
V
SW
Maximum
-0.3V to +6V
-1.5V to V
I N
+0.7V
-0.3V to V
I 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
T
A
T
J
T
STG
Rating
-40 to +85
-40 to +125
-65 to +150
Unit
o
C
n
Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Package
SOP-8/PP
DFN-8C
SOP-8/PP
Die Attach
Symbol
θ
J
C
Maximum
15
8.2
Unit
o
C/W
Thermal Resistance
(Junction to Ambient)
Conductive Epoxy
DFN-8C
SOP-8/PP
θ
JA
75
70
1.333
Internal Power Dissipation
DFN-8C
Maximum Junction Temperature
Lead Temperature (Soldering 10sec)**
* Measure
θ
JC
on backside center of molding compound if IC has no tab.
** MIL-STD-202G 210F
Rev. A.03
P
D
1.429
150
260
mW
o
C
C
o
5
淘e淘
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
