AME
AME5282
n
General Description
The AME5282 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. 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.
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
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Typical Application
V
IN
5V
C
IN
10µF
OFF ON
L
2.2µH
IN
EN
AME5282
COMP
GND
FB
FREQ
R
FREQ
18KΩ
R2
24KΩ
SW
R1
75KΩ
V
OUT
3.3V
C
OUT
22µF
C
2
Optional
C
1
680pF
R
3
25KΩ
Figure 1. 3.3V at 2A Step-Down Regulators.
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Features
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2A Output Current
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Stable with Low ESR Output Ceramic
Capacitors
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Pre-Regulator for Linear Regulators
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Up to 95% Efficiency
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Less than 1µA Shutdown Current
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Wide Switching Frequency Range from
300KHz~2MHz
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Thermal Protection
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Cycle-by-Cycle Over Current Protection
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Output Adjustable from 0.8V to V
IN
l
Short Circuit Protection
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Green Products Meet RoHS Standards
V
IN
2.5V~5V
C
IN
10µF
OFF ON
IN
EN
AME5282
COMP
C
2
Optional
C
1
680pF
R
3
8.2KΩ
GND
FB
FREQ
R
FREQ
18KΩ
SW
L
1.5µH
R1
6KΩ
V
OUT
1V
C
OUT
22µF
R2
24KΩ
Figure 2. 1V at 2A Step-Down Regulators.
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Applications
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TV
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Distributed Power Systems
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Pre-Regulator for Linear Regulators
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Digital Cameras
Rev. A.02
1
AME
AME5282
n
Functional Block Diagram
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
IN
CURRENT
SENSE
CURRENT
LIMIT
EN
ENABLE
UVLO
FREQ
OSC
SLOPE
COMP
DRIVER
SW
GND
FB
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Pin Configuration
SOP-8/PP
Top View
8
7
6
5
AME5282
9
1
2
3
4
Note. Connect exposed pad (heat sink on the back) to GND.
2
Rev. A.02
+
EA
0.8V
VREF
+
+
SOFT
START
LOGIC
PWM
SW
-
-
OTP
Short circuit
IRCMP
-
+
PGND
DFN-8C
(3mmx3mmx0.75mm)
Top View
AME5282-AZAADJ
1. COMP
2. GND
3. EN
4. IN
5. SW
6. SW
7. FREQ
8. FB
9. GND (Exposed Pad)
* Die Attach:
Conductive Epoxy
1
2
3
AME5282
9
4
8
7
6
5
AME5282-AVAADJ
1. COMP
2. GND
3. EN
4. IN
5. SW
6. SW
7. FREQ
8. FB
9. GND (Exposed Pad)
* Die Attach:
Conductive Epoxy
AME
AME5282
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.
Ground. Connect the exposed pad to GND.
Enable. Pull EN below 0.4V 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.
Ground. Connect the exposed pad to GND.
1
COMP
2
3
GND
EN
4
IN
5, 6
SW
7
FREQ
8
FB
9
GND
Rev. A.02
3
AME
AME5282
n
Ordering Information
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5282 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
Package Type
Number of Pins
Output Voltage
A
(SOP-8/PP)
(DFN-8C)
1. COMP
2. GND
3. EN
4. IN
5. SW
6. SW
7. FREQ
8. FB
9. GND
Z: SOP/PP
V: DFN
A: 8
ADJ: Adjustable
4
Rev. A.02
AME
AME5282
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
6
-0.7V to V
IN
+0.7V
-0.3V to V
IN
+0.3V
2
200
Unit
V
V
V
kV
V
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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
Rev. A.02
5
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