AME5283/Step-Down Converter

AME
AME5283
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
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 circuit frequency protection and thermal shutdown. In shutdown mode, the regulator reduces the current less than
1µA of supply current.
n Typical Application
L
2.2uH
VIN
5V
IN
R4
100KΩ
CIN
10uF
P.G
SW
AME5283
OFF ON
PGOOD
EN
COMP
C2
Optional
C1
680pF
R1
75KΩ
COUT
22uF
FB
SS
FREQ
C3
0.1uF
GND
R2
24KΩ
RFREQ
18KΩ
R3
25KΩ
This device is available in SOP-8/PP and DFN-8C package with exposed pad for low thermal resistance.
VOUT
3.3V
n Features
l 2A Output Current
l External Soft Start
L
1.5uH
VIN
5V
IN
l Stable with Low ESR Output Ceramic
Capacitors
l Up to 95% Efficiency
l Less than 1µA Shutdown Current
R4
100KΩ
CIN
10uF
PGOOD
l Wide Switching Frequency Range from
300KHz~2MHz
l Thermal Shutdown
l Cycle by Cycle Over Current Protection
SW
AME5283
P.G OFF ON
EN
COMP
C2
Optional
V OUT
1V
C1
680pF
R1
6KΩ
FB
SS
FREQ
GND
R3
8.2KΩ
C3
0.1uF
COUT
22uF
R2
24KΩ
RFREQ
18KΩ
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
n Applications
l TV
l Distributed Power Systems
l Pre-Regulator for Linear Regulators
Rev. A.03
1
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Functional Block Diagram
IN
CURRENT
SENSE
EN
ENABLE
UVLO
CURRENT
LIMIT
FREQ
OSC
SLOPE
COMP
FB
+
+
0.8V
+
+
EA
Hiccup
10uA
0.7V
-
DRIVER
LOGIC
SW
PWM
IRCMP
PG
+
SS
PGND
OTP
UV
0.4V
GND
PGOOD
n Pin Configuration
SOP-8/PP
Top View
8
7
6
5
DFN-8C
(3mmx3mmx0.75mm)
Top View
AME5283-AZAADJ
8
7
6
5
1. COMP
2. SS
2. SS
3. EN
AME5283
9
3. EN
AME 5283
4. IN
9
5. SW
1
2
3
4
AME5283-AVAADJ
1. COMP
6. FREQ
4. IN
5. SW
1
2
3
4
6. FREQ
7. FB
7. FB
8. PG
8. PG
9. GND (Exposed Pad)
9. GND (Exposed Pad)
* Die Attach:
Conductive Epoxy
* Die Attach:
Conductive Epoxy
Note. Connect exposed pad (heat sink on the back) to GND.
2
Rev. A.03
AME
AME5283
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n Pin Description
Pin No.
Pin Name
Pin Description
1
COMP
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.
2
SS
Soft-Start function. Connect a capacitor from SS to GND to set the soft-start
period.
3
EN
Enable. Pull EN below 0.6V to shut down the regulator.
4
IN
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.
5
SW
6
FREQ
7
FB
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.
8
PG
Power-Good output.
This open-drain output is low when output is out of regulation.
9
GND
Rev. A.03
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.
Ground. Connect the exposed pad to GND.
3
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Ordering Information
AME5283 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
A
(SOP-8/PP)
A
(DFN-8C)
4
1. COMP
2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND
Package
Type
V: DFN
Z: SOP/PP
Number of
Pins
A: 8
Output Voltage
ADJ: Adjustable
1. COMP
2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND
Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Absolute Maximum Ratings
Parameter
Symbol
Maximum
Unit
Supply Voltage
V IN
-0.3V to +6V
V
Switch Voltage
V SW
-1.5V to V I N +0.7V
V
-0.3V to V I N +0.3V
V
HBM
2
kV
MM
200
V
Symbol
Rating
Unit
Ambient Temperature Range
TA
-40 to +85
Junction Temperature Range
TJ
-40 to +125
Storage Temperature Range
TSTG
-65 to +150
EN, FB, COMP, FREQ to GND
ESD Classification
n Recommended Operating Conditions
Parameter
o
C
n Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Package
Die Attach
SOP-8/PP
Symbol
θJC
DFN-8C
Maximum
Unit
15
8.2
o
Thermal Resistance
(Junction to Ambient)
SOP-8/PP
Conductive Epoxy
θJA
DFN-8C
70
SOP-8/PP
1.333
PD
Internal Power Dissipation
DFN-8C
C/W
75
mW
1.429
Maximum Junction Temperature
150
o
C
Lead Temperature (Soldering 10sec)**
260
o
C
* Measure θJC on backside center of molding compound if IC has no tab.
** MIL-STD-202G 210F
Rev. A.03
5
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Electrical Specifications
VIN=5V, TA=25oC, unless otherwise noted.
Parameter
Input Voltage Range
Input UVLO
Symbol
Test Condition
VIN
Min
Typ
2.5
VUVLO
Quiescent Current
IQ
VEN =5V, VFB=0.7V
(No Switching)
Shutdown Current
ISHDN
VEN =0V
Feedback Voltage
VFB
0.784
Feedback Current
IFB
-50
Units
5.5
V
2.3
V
600
uA
0.8
1
uA
0.816
V
50
nA
Load Regulation
REGLOAD
0A<IOUT<2A
0.25
%/A
Line Regulation
REGLINE
2.7V<VIN<5.5V
0.25
%/V
EN Voltage High
1.4
VEN
V
EN Voltage Low
EN Leakage Current
Switching Frequency
IENLK
F SW
VEN =3V
Error Amp Transconductance
GEA
Switch Leakage Current
ISWLK
0.4
V
0.1
1
uA
RFREQ=NC
240
300
360
KHz
RFREQ =120KΩ
480
600
720
KHz
RFREQ=47K Ω
0.8
1
1.2
MHz
RFREQ=18KΩ
1.6
2
MHz
3.3
3.7
A
400
uA/V
High-side Switch Current Limit
VSW =0V, VEN =0V
0.1
20
uA
High-side Switch On Resistance
RDSON,HI
130
mΩ
Low-side Switch On Resistance
RDSON,LO
90
mΩ
Thermal Shutdown Protection
6
Max
OTP
Rising
160
o
C
OTH
Hysteresis
20
o
C
Rev. A.03
AME
AME5283
n Detailed Description
Normal Operation
The AME5283 uses a user adjustable frequency, current mode step-down architecture with internal MOSFET
switch. During normal operation, the internal high-side
(PMOS) switch is turned on each cycle when the oscilla
for sets the SR latch, and turned off when the comparator
resets the SR latch. The peak inductor current at which
comparator resets the SR latch is controlled by the output of error amplifier EA. While the high-side switch is
off, the low-side switch turns on until either the inductor
current starts to reverse or the beginning of the next
switching cycle.
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
Hiccup Mode
During hiccup mode, the AME5283 disables the highside MOSFET and begins a cool down period of 8000uS
. At the conclusion of this cool down period, the regulator performs an external 800uS identical to the soft start
at turn-on. ( If 10nF capacitor is used to set the soft-start)
Under Voltage Protection
Under Voltage Protection will activate once the feedback voltage falls below 0.4V, the operating frequency is
switched to 1/10 of normal switching frequency and after
four-times hiccup mode counted, the internal high-side
power switch will be turned off, and latched, Unless Restart the power supply.
Dropout Operation
The output voltage is dropped from the input supply for
the voltage which across the high-side switch. As the
input supply voltage decreases to a value approaching
the output voltage, the duty cycle increases toward the
maximum on-time. Further reduction of the supply voltage forces the high-side switch to remain on for more
than one cycle until it reaches 100% duty cycle.
Over Current Protection
The AME5283 cycle-by-cycle limits the peak inductor
current to protect embedded switch from damage. Hence
the maximum output current (the average of inductor current) is also limited. In case the load increases, the inductor current is also increase. Whenever the current
limit level is reached, the output voltage can not be regulated and starting to drop.
Power Good Output
The AME5283 power good output is an open-drain output and requires a pull up resistor. When the output voltage is 12.5% above or 12.5% below its set voltage,
PGOOD will be pulled low. It is held low until the output
voltage returns to within the allowed tolerances once more.
During soft-start, PGOOD is actively held low and is only
allowed to transition high when soft-start is over and the
output voltage reaches 87.5% of its set voltage.
Soft-Start
Over Temperature Protectiion
The in most applications the AME5283 does not dissipate much heat due to high efficiency. But, in applications where the AME5283 is running at high ambient temperature with low supply voltage and high duty cycles,
such as in dropout, the heat dissipated may exceed the
maximum junction temperature of the part. If the junction temperature reaches approximately 160oC, the internal high-side power switch will be turned off and the SW
switch will become high impedance.
The AME5283 contains an external soft-start clamp that
gradually raises the output voltage. The soft-start timing
is programmed by the external capacitor between SS pin
and GND. The chip provides an internal charge current
for the external capacitor. If 10nF capacitor is used to set
the soft-start, the period will be 800uS(typ.).
Rev. A.03
7
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
Inductor Selection
For most applications, the value of the inductor will fall
in the range of 2.2µH to 4.7µH. Its value is chosen based
on the desired ripple current. Large value inductors lower
ripple current and small value inductors result in higher
ripple currents. Higher V IN or VOUT also increase the ripple
current ∆IL:
∆I L =
 V
1
VOUT 1 − OUT
f ×L
VIN




A reasonable inductor current ripple is usually set as 1/
3 to 1/5 of maximum out current. The DC current rating
of the inductor should be at least equal to the maximum
load current plus half the ripple current to prevent core
saturation. For better efficiency, choose a low DCR inductor.
In continuous mode, the source current of the top
MOSFET is a square wave of duty cycle VOUT/VIN. To
prevent large voltage transients, a low ESR input capacitor sized for maximum RMS current must be used. The
maximum RMS capacitor current is given by:
≅ I OMAX
When choosing the input and output ceramic capacitors, choose the X5R or X7R dielectric formulations. These
dielectrics have the best temperature and voltage characteristics of all the ceramics for given value and size
Output Voltage Programming
The AME5283 output voltage of the AME5283 is set by
a resistive divider according to the following formula:
 R1 
VOUT = 0.8 × 1 +
Volt .
 R2
Some standard value of R1, R2 for most commonly
used output voltage values are listed in Table 1.
Capacitor Selection
CIN requires IRMS
For a fixed output voltage, the output ripple is highest
at maximum input voltage since ∆IL increases with input
voltage.
VOUT (VIN − VOUT )
VIN
This formula has a maximum at VIN=2V OUT, where
IRMS=IOUT/2. For simplification, use an input capacitor with
a RMS current rating greater than half of the maximum
load current.
VOUT(V)
R1(KΩ )
R2(KΩ )
1.1
7.5
20
1.2
10
20
1.5
17.4
20
1.8
30
24
2.5
51
24
3.3
75
24
The selection of COUT is driven by the required effective
series resistance (ESR). Typically, once the ESR requirement for COUT has been met, the RMS current rating
generally far exceeds the IRIPPLE(P-P) requirement. The
output ripple VOUT is determined by:

1
∆VOUT ≅ ∆I L  ESR +
8 fCOUT

8



Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
Loop Compensation
Where GEA is the error amplifier transconductance
The AME5283 employs peak current mode control for
easy use and fast transient response. Peak current mode
control eliminates the double pole effect of the output LC
filter. It greatly simplifies the compensation loop design.
AEA is the error amplifier voltage gain
RC is the compensation resistor
CC is the compensation capacitor
With peak current mode control, the buck power stage
can be simplified to be a one-pole and one-zero system
in frequency domain. The pole can be calculated by:
f P1 =
1
2π × COUT × RL
The zero is a ESR zero due to output capacitor and its
ESR. It can be calculated by:
f Z1 =
1
2π × COUT × ESRCOUT
Where COUT is the output capacitor, RL is load resistance;
ESRCOUT is the equivalent series resistance of output
capacitor.
The compensation design is to shape the converter close
loop transfer function to get desired gain and phase. For
most cases, a series capacitor and resistor network connected to the COMP pin sets the pole-zero and is adequate for a stable high-bandwidth control loop.
In the AME5283, FB pin and COMP pin are the inverting input and the output of internal transconductance error amplifier (EA). A series RC and CC compensation
network connected to COMP pin provides one pole and
one zero: for RC << A EA/GEA
fP2 =
fZ2
1

A 
G EA
2π × CC ×  R C + EA  ≈
G EA  2π × CC × AEA

1
=
2π × CC × RC
The desired crossover frequency fC of the system is
defined to be the frequency where the control loop has
unity gain. It is also called the bandwidth of the converter. In general, a higher bandwidth means faster response to load transient. However, the bandwidth should
not be too high because of system stability concern. When
designing the compensation loop, converter stability under all line and load condition must be considered. Usually, it is recommended to set the bandwidth to be less
than 1/10 of switching frequency. Using selected crossover frequency, fC, to calculate RC:
RC = f C ×
VOUT 2π × COUT
×
VFB GEA × G CS
Where G CS is the current sense circuit
transconductance. The compensation capacitor CC and
resistor RC together make zero. This zero is put somewhere close to the pole fP1 of selected frequency. CC is
selected by:
CC =
COUT × RL
RC
Checking Transient Response
The regulator loop response can be checked by looking at the load transient response. Switching regulators
take several cycles to respond to a step in load current.
When a load step occurs, VOUT immediately shifts by an
amount equal to (∆ILOAD x ESR), where ESR is the effective series resistance of COUT. ∆ILOAD also begins to charge
or discharge COUT, which generates a feedback error signal.
The regulator loop then acts to return V OUT to its steady
state value. During this recovery time VOUT can be monitored for overshoot or ringing that would indicate a stability problem.
Rev. A.03
9
AME
AME5283
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
Efficiecny Considerations
Although all dissipative elements in the circuit produce
losses, one major source usually account for most of the
losses in AME5283 circuits: I2R losses. The I2R loss
dominates the efficiency loss at medium to high load
currents.
The I2R losses are calculated from the resistances of
the internal switches, RSW, and external inductor RL. In
continuous mode, the average output current flowing
through inductor L is "chopped" between the main switch
and the synchronous switch. Thus the series resistance
looking into the SW pin is a function of both top and
bottom MOSFET RDS(ON) and the duty cycle (D) as follows:
RSW = (RDS(ON)TOP)(D) + (RDS(ON)BOTTOM )(1-D)
The RDS(ON) for both the top and bottom MOSFETs can
be obtained from Electrical Characteristics table. Thus,
to obtained I2R losses, simply add RSW to RL and multiply
the result by the square of the average output current.
Other losses including CIN and COUT ESR dissipative
losses and inductor core losses generally account for
less than 2% total additional loss.
Thermal Considerations
In most application the AME5283 does not dissipate
much heat due to its high efficiency. But, in applications
where the AME5283 is running at high ambient temperature with low supply voltage and high duty cycles, such
as in dropout, the heat dissipated may exceed the maximum junction temperature of the part. If the junction
temperature reaches approximately 160oC, both power
switches will be turned off and the SW switch will become high impedance.
10
Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Typical Operating Circuit
VIN
2.5V to 5V
L
4
R4
100KΩ
CIN
10µF
IN
SW
V OUT
5
R1
8
PGOOD
AME5283
6
3
FREQ
EN
Chip Enable
RFREQ
(Exposed pad)
GND 9
1 COMP
C1
R2
SS 2
C2
Css
R3
Optional
COUT
FB 7
VOUT(V)
C IN( µF)
R1(KΩ )
R2(KΩ )
R3(KΩ )
C1(pF)
L(µH)
COUT(µF )
3.3
10
75
24
25
680
2.2
22
2.5
10
51
24
20
680
2.2
22
1.8
10
30
24
15
680
1.5
22
1.5
10
21
24
13
680
1.5
22
1.2
10
12
24
11
680
1.5
22
1
10
6
24
8.2
680
1.5
22
Table 1. Recommended Components Selectin for fsw = 2MHz
The ground area must provide adequate heat
dissipating area to the thermal pad and using
multiple vias to help thermal dissipation
.
R3
COMP 1
GND
8
PG
7
FB
Place the feedback
resistors as close to
the IC as possible
R2
C1
R1
SS
GND
2
Css
CIN must be
placed
between V I N
and GND as
close as
possible
VOUT
GND
EN
3
VI N
4
9
RFREQ
GND
6 FREQ
5
SW
CIN
L1
COUT
GND
Place the input and output
capacitors as close to the IC as
possible
SW should be
connected to inductor
by wide and short
trace , and keep
sensitive components
away from this trace
VOUT
Figure 3. AME5283 Regulators Layout Diagram
Rev. A.03
11
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Characterization Curve
Efficiency vs. Output Current
Efficiency vs. Output Current
100
100
90
90
80
V OUT=3.3V
70
V OUT=2.5V
VOUT=1.2V
V OUT=1.8V
60
Efficiency (%)
Efficiency (%)
80
VOUT=1V
50
40
VIN = 5V
RFREQ = 18K
10
VOUT=1.0V
50
40
VIN = 5V
R FREQ= 30K
10
0
0
500
1000
1500
0
2000
Efficiency vs. Output Current
1000
1500
2000
Efficiency vs. Output Current
100
100
90
90
80
VOUT=2.5V
70
VOUT=1.8V
V OUT=1.0V
VOUT=3.3V
60
VOUT=1.2V
50
40
30
Efficiency (%)
80
Efficiency (%)
500
Output Current(mA)
Output Current(mA)
70
VOUT=3.3V
V OUT=2.5V
V OUT=1.0V
V OUT=1.8V
60
VOUT=1.2V
50
40
30
20
20
V IN = 5V
R FREQ = 47K
10
500
1000
1500
VIN = 5V
RFREQ = NC
10
0
0
Output Current(mA )
12
VOUT =1.2V
60
20
20
0
VOUT=1.8V
V OUT=3.3V
30
30
0
VOUT=2.5V
70
2000
0
500
1000
1500
2000
Output Current(mA )
Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Characterization Curve (Contd.)
Load Step
Load Step
1
1
VIN =3.3V
VOUT=1.0V
IL= 1A to 2A
2
VIN =3.3V
VOUT=2.5V
IL= 1A to 2A
2
Time (400µSec/DIV)
Time (200µSec/DIV)
1) VOUT= 200mV/div
2) IL= 1A/div
1) VOUT= 200mV/div
2) IL= 1A/div
Load Step
Load Step
1
1
VIN =5.0V
VOUT=1.0V
IL= 1A to 2A
2
Time (200µSec/DIV)
1) VOUT= 100mV/div
2) IL= 1A/div
Rev. A.03
VIN =5.0V
VOUT=3.3V
IL= 1A to 2A
2
Time (400µSec/DIV)
1) VOUT= 100mV/div
2) IL= 1A/div
13
AME
AME5283
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n Characterization Curve (Contd.)
Power ON from EN
Power off from EN
1
1
2
2
3
3
4
4
Time (400nS /DIV)
Time (400uS /DIV)
1) EN= 5V/div
2) VSW= 5V/div
3) VOUT = 1V/div
4) IL = 1A/div
1) EN= 5V/div
2) VSW= 5V/div
3) VOUT = 1V/div
4) IL = 1A/div
Power ON from VIN
1
1
2
2
3
3
4
4
Time ( 2.0mS /DIV )
1) VIN= 5V/div
2) VSW= 5V/div
3) VOUT = 1V/div
4) IL = 1A/div
14
Power Off from VIN
Time (2.0mS /DIV )
1) VIN= 5V/div
2) VSW= 5V/div
3) VOUT = 1V/div
4) IL = 1A/div
Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Characterization Curve (Contd.)
VFB vs. Temperature
Frequency vs. Temperature
0.82
450
400
Frequency (KHz)
VFB (V)
0.81
0.80
0.79
350
300
250
VIN = 5V
0.78
200
0.77
40
25
10
5
20
35
50
65
80
95
110
150
125
40
25
10
Temperature (°C)
5
20
35
50
65
80
95
110
125
Temperature (°C)
Frequency vs. Supply Voltage
Frequency vs. Output Current
450
300
290
280
Frequency (KHz)
Frequency (KHz)
400
350
300
250
VOUT = 3.3V
200
270
260
250
240
230
VIN=5.0V
VOUT = 3.3V
220
210
150
3.5
4
4.5
Input Voltage(V)
Rev. A.03
5
5.5
200
100
300
500
700
900
1100 1300
1500 1700
1900
IOUT (mA)
15
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
„ Characterization Curve (Contd.)
Steady State Test
Steady State Test
VIN = 5V
VOUT= 3.3V
IOUT= 2A
VIN = 5V
VOUT= 1.1V
IOUT= 2A
1
1
2
2
Time (400nS /DIV )
Time (400nS /DIV )
1) VOUT= 10mV/div
2) VSW = 2V/div
1) VOUT= 10mV/div
2) VSW = 2V/div
Power Good
Short Circuit Test
1
VOUT
2V/DIV
2
3
VIN=5.0V
VOUT = 3.3V
IOUT
2A/DIV
4
Time (2ms/div)
Time (100ms/DIV)
1) EN= 5V/div
2) PG= 5V/div
3) VOUT = 1V/div
4) IL = 2A/div
16
Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Tape and Reel Dimension
SOP-8/PP
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOP-8/PP
12.0±0.1 mm
4.0±0.1 mm
2500pcs
330±1 mm
DFN-8C
(3mmx3mmx0.75mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
DFN-8C
(3x3x0.75mm)
12.0±0.1 mm
4.0±0.1 mm
3000pcs
330±1 mm
Rev. A.03
17
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Package Dimension
SOP-8/PP
TOP VIEW
SIDE VIEW
D1
SYMBOLS
?
E1
E2
E
L1
C
PIN 1
D
e
A1
FRONT VIEW
18
A
A2
b
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
1.350
1.750
0.053
0.069
A1
0.000
0.150
0.000
0.006
A2
1.350
1.600
0.053
0.063
C
0.100
0.250
0.004
0.010
E
3.750
4.150
0.148
0.163
E1
5.700
6.300
0.224
0.248
L1
0.300
1.270
0.012
0.050
b
0.310
0.510
0.012
0.020
D
4.720
5.120
0.186
0.202
1.270 BSC
e
0.050 BSC
θ
0
8
E2
2.150
2.513
0.085
0.099
D1
2.150
3.402
0.085
0.134
o
o
0
o
8
o
Rev. A.03
AME
2A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5283
n Package Dimension (Contd.)
DFN-8C
(3mmx3mmx0.75mm)
b
D
e
L
E
E1
PIN 1 IDENTIFICATION
TOP VIEW
D1
BOTTOM VIEW
A
G1
G
REAR VIEW
SYMBOLS
Rev. A.03
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
D
2.900
3.100
0.114
0.122
E
2.900
3.100
0.114
0.122
e
0.600
0.700
0.024
0.028
D1
2.200
2.400
0.087
0.094
E1
1.400
1.600
0.055
0.063
b
0.180
0.320
0.007
0.013
L
0.375
0.575
0.015
0.023
G
0.153
0.253
0.006
0.010
G1
0.000
0.050
0.000
0.002
19
www.ame.com.tw
E-Mail: sales@ame.com.tw
Life Support Policy:
These products of AME, Inc. are not authorized for use as critical components in life-support
devices or systems, without the express written approval of the president
of AME, Inc.
AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and
advises its customers to obtain the latest version of relevant information.
© AME, Inc. , December 2012
Document: TU003-DS5283-A.03
Corporate Headquarter
AME, Inc.
8F, 12 WenHu St., Nei-Hu
Taipei 114, Taiwan .
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989