AMETHERM AME5258-AEV330 1.5mhz, 600ma synchronous buck converter Datasheet

AME
AME5258
1.5MHz, 600mA
Synchronous Buck Converter
n General Description
n Applications
l Cellular Phones
The AME5258 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.2V, 1.8V, 2.5V and
3.3V. Supply current with no load is 300µA and drops to
<1µA in shutdown. The 2.5V to 5.5V input voltage range
makes the AME5258 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low
dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very
low output ripple voltage for noise sensitive applications.
At very light load, the AME5258 will automatically skip
pulses in pulse skip mode operation to maintain output
regulation.
The AME5258 is simple to use. As with standard
LDO's,Input and output capacitor are required. The only
other element is a small, low cost, 2.2µH inductor.Low
output voltages are easily supported with the 0.6V feedback reference voltage. And 100% duty cycle when Vin
approaches Vout.
l Digital Cameras
l Portable Electronics
l USB Devices
l MP3 Players
l LDO Replacement
n Typical Application
Fixed Output Voltage
2.2µH
VIN
IN
C IN
4.7µF
CER
AME5258
C OUT
10µF
CER
OUT
EN
n Features
VOUT
SW
GND
l High Efficiency: Up to 96%
l 600mA Output Current at VIN=3V
Figure 1: High Efficiency Step-Down Conventer
l 2.5V to 5.5V Input Voltage Range
l 1.5MHz Constant Frequency Operation
Adjustable Output Voltage
l No Schottky Diode Required
l Low Dropout Operation: 100% Duty Cycle
l 0.6V Reference Allows Low Output
Voltages
l Shutdown Mode Draws<1µA Supply
Current
l Current Mode Operation for Excellent
VIN = 2.5V to 5.5V
VIN
IN
C IN
4.7µF
CER
2.2µH
VOUT
SW
AME5258
1.8V
600mA
22pF
R1
887K
FB
EN
GND
Line and Load Transient Response
C OUT
10µF
CER
R2
442K
l Overtemperature Protection
l Internal Soft Start
l Space Saving 5-Pin SOT-25 Package
VOUT=VFB (R1+R2)/R2
Figure 2: 1.8V at 600mA Step-Down Requlator
l Meet RoHS Standards
Rev.A.05
1
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Function Diagram
IN
0.6V
VFB
5
4
IN
3
SW
2
GND
Slope
COMP
+
-
+
-
ICOMP
0.55V
UVDET
+
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
+
1
0.6V
VREF
IRCMP
-
EN
+
0.65V
OVDET
-
OSC
Figure 3: Founction Block Diagram
2
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Pin Configuration
SOT-25
Top View
5
( Fixed Output )
4
AME5258
AME5258-AEVxxx
SOT-25
Top View
5
( Adjustable Output )
4
1. EN
1. EN
2. GND
2. GND
AME5258
3. SW
4. IN
2
3. SW
4. IN
5. OUT
1
AME5258-BEVADJ
5. FB
3
1
* Die Attach:
2
3
* Die Attach:
Conductive Epoxy
Conductive Epoxy
n Pin Description
Pin Number
Pin Name
AME5258-AEVxxx
Enable Control Input.
Forcing this pin above 1.5V enables the part. Forcing
this pin below 0.3V shuts down the device. In shutdown,
all functions are disabled drawing <1µA supply current.
Do not leave EN floating.
1
1
EN
2
2
GND
Ground Pin
SW
Switch Node Connection to Inductor.
This pin connects to the drains of the internal main and
synchronous power MOSFET switches.
3
Rev.A.05
Pin Description
AME5258-BEVADJ
3
4
4
IN
Main Supply Pin.
Must be closely decoupled to GND, Pin2, with a 4.7µF
or greater ceramic capactior.
N/A
5
FB
Feedback Pin.
Receives the feedback voltage from an external resistive
divider across the output.
5
N/A
OUT
Output Voltage for fixed version
3
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Ordering Information
AME5258 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin
Configuration
A
(SOT-25)
B
(SOT-25)
4
Package
Type
Number of
Pins
1. EN
2. GND
3. SW
4. IN
5. OUT
E: SOT-2X
V: 5
120:
180:
250:
330:
1. EN
2. GND
3. SW
4. IN
5. FB
E: SOT-2X
V: 5
ADJ: Adjustable
Output Voltage
1.2V
1.8V
2.5V
3.3V
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Available Options
Part Number
Marking*
Output Voltage
Package
Operating Ambient
Temperature Range
AME5258-BEVADJ
BWMMXX
ADJ
SOT-25
-40OC to +85OC
AME5258-AEV120
BYRMXX
1.2V
SOT-25
-40OC to +85OC
AME5258-AEV180
BYJMXX
1.8V
SOT-25
-40OC to +85OC
AME5258-AEV250
BYNMXX
2.5V
SOT-25
-40OC to +85OC
AME5258-AEV330
BYFMXX
3.3V
SOT-25
-40OC to +85OC
Note:
1. The first 3 places represent product code. It is assigned by AME such as BWM.
2. A bar on top of first letter represents Green Part such as BWM.
3. The last 3 places MXX represent Marking Code. It contains M as date code in "month", XX as LN code and
that is for AME internal use only. Please refer to date code rule section for detail information.
4. Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package
type.
n Absolute Maximum Ratings
Parameter
Symbol
Maximum
Unit
VIN
6
V
VEN ,VFB
VIN
V
SW Voltage
VSW
-0.3 to (V IN +0.3)
V
P-Channel Switch Source Current (DC)
ISW
900
mA
N-Channel Switch Sink Current (DC)
ISW
900
mA
Input Supply Voltage
EN, FB Voltages
ESD Classification
C*
Caution: Stress above the listed in absolute maximum ratings may cause permanent damage to the device.
* HBM C: 4000V ~ 6000V
Rev.A.05
5
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Recommended Operating Conditions
Parameter
Symbol
Rating
Unit
Ambient Temperature Range
TA
-40 to +85
o
Junction Temperature Range
TJ
-40 to +125
o
Storage Temperature Range
TSTG
-65 to +150
o
C
C
C
n Thermal Information
Parameter
Package
Thermal Resistance*
(Junction to Case)
SOT-25
Thermal Resistance
(Junction to Ambient)
SOT-25
Internal Power Dissipation
SOT-25
Die Attach
Conductive Epoxy
Solder Iron (10 Sec)**
Symbol
Maximum
θJC
81
o
C/W
θJA
260
o
C/W
PD
400
350
Unit
mW
o
C
* Measure θJC on center of molding compound if IC has no tab.
** MIL-STD-202G 210F
6
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Electrical Specifications
TA=25oC. VIN=3.6V unless otherwise specified.
Parameter
Test Condition
Symbol
Input Volatge
VI N
Feedback Current
IFB
Regulated Feedback
Voltage
V FB
Reference Voltage
Line Regulation
∆VFB
AME5258-BEVADJ
VIN =2.5V to 5.5V
IOUT=100mA
VOUT=2.5V,
IOUT=100mA
Switch Current Limit
Output Voltage
Load Regulation
REGLINE
VIN =2.5V to 5.5V
ICL
VI N=3V, VFB=0.5V
Duty Cycle < 35%
VI N=3V, VOUT=90%
Duty Cycle < 35%
5.5
V
±30
nA
0.6
0.6120
V
0.04
0.4
%/V
1.164
1.2
1.236
1.746
1.8
1.854
2.425
2.5
2.575
3.201
3.3
3.399
0.04
0.4
0.5880
ISD
Quiescent Current
IQ
0.75
1
A
0.5
%
AME5258-AEVxxx
VEN =0V, VI N=4.2V
V FB=0.5V or V OUT=90%
VEN =VI N=4.2V
VI N=2.5V & IOUT=100mA
fOSC
%/V
AME5258-BEVADJ
VLOADREG
Shutdown Current
Oscillator Frequency
Units
V
AME5258-AEVxxx
IOUT=100mA
VOUT=3.3V,
Output Voltage
Line Regulation
Max
AME5258-BEVADJ
IOUT=100mA
VOUT=1.8V,
∆VOUT
Typ
2.5
VOUT=1.2V,
Regulated Output Voltage
Min
1.2
0.1
1
300
450
1.5
1.8
VF B=0V or V OUT=0V
210
µA
MHz
kHz
RDSON of P-Channel FET
RDSON(P)
ISW =100mA
0.4
0.6
Ω
RDSON of N-Channel FET
RDSON(N)
ISW = -100mA
0.35
0.5
Ω
Switch Leakage Current
ISW
±1
µA
EN Input Threshold (High)
V EH
EN Input Threshold (Low)
VEL
0.3
EN Input Current
IEN
±1
Rev.A.05
VEN =0V,
VSW =0V or 5V,VI N=5V
1.5
V
µA
7
AME
AME5258
1.5MHz, 600mA
Synchronous Buck Converter
n Detailed Description
Main Control Loop
Dropout Operation
The AME5258 uses a constant frequency, current
modestep-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET)
switches are internal. During normal operation, the internal top power MOSFET is turned on each cycle when the
oscillator sets the RS latch, and turned off when the current comparator, ICOMP, resets the RS latch. The peak
inductor current at which ICOMP resets the RS latch, is
controlled by the output of error amplifier EA. When the
load current increases, it causes a slight decrease in the
feedback voltage, FB, relative to the 0.6V reference, which
in turn,causes the EA amplifier's output voltage to increase
until the average inductor current matches the new load
current. While the top MOSFET is off, the bottom
MOSFET is turned on until either the inductor current
starts to reverse, as indicated by the current reversal comparator IRCMP, or the beginning of the next clock cycle.
The comparator OVDET guards against transient overshoots >7.8% by turning the main switch off and keeping
it off until the fault is removed.
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 main switch to remain on for
more than one cycle until it reaches 100% duty cycle.
The output voltage will then be determined by the input
voltage minus the voltage drop across the P-channel
MOSFET and the inductor. An important detail to remember is that at low input supply voltages, the RDS(ON) of
the P-channel switch increases (see Typical Performance
Characteristics). Therefore, the user should calculate the
power dissipation when the AME5258 is used at 100%
duty cycle with low input Voltage.
Pulse Skipping Mode Operation
At light loads, the inductor current may reach zero or
reverse on each pulse. The bottom MOSFET is turned off
by the current reversal comparator, IRCMP, and the switch
voltage will ring. This is discontinuous mode operation,
and is normal behavior for the switching regulator.
Short-Circuit Protection
When the output is shorted to ground, the frequency of
the oscillator is reduced to about 210kHz, 1/7 the nominal frequency. This frequency foldback ensures that the
inductor current has more time to decay, thereby preventing runaway. The oscillator's frequency will progressively increase to 1.5MHz when VFB or VOUT rises above
0V.
8
n Application Information
Inductor Selection
For most applications, the value of the inductor will fall
in the range of 1µH 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 V OUT also increases the ripple
current as shown in equation 1. A reasonable starting point
for setting ripple current is IL = 240mA (40% of 600mA).
∆ IL=
VOUT
1
⋅ VOUT (1 −
)
f ⋅L
VIN
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. Thus, a 720mA rated
inductor should be enough for most applications (600mA+
120mA). For better efficiency, choose a low DC-resistance inductor.
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
Inductor Core Selection
Once the value for L is known, the type of inductor
must be selected. High efficiency converters generally
cannot afford the core loss found in low cost powdered
iron cores, forcing the use of more expensive ferrite or
mollypermalloy cores. Actual core loss is independent of
core size for a fixed inductor value but it is very dependent on the inductance selected. As the inductance increases, core losses decrease. Unfortunately, increased
inductance requires more turns of wire and therefore copper losses will increase. Ferrite designs have very low
core losses and are preferred at high switching frequencies, so design goals can concentrate on copper loss
and preventing saturation. Ferrite core material saturates
"hard", which means that inductance collapses abruptly
when the peak design current is exceeded. This result in
an abrupt increase in inductor ripple current and consequent output voltage ripple. Do not allow the core to saturate! Different core materials and shapes will change the
size/current and price/current relationship of an inductor.
Toroid or shielded pot cores in ferrite or permalloy materials are small and don't radiate energy but generally cost
more than powdered iron core inductors with similar characteristics. The choice of which style inductor to use
mainly depends on the price vs. size requirements and
any radiated field/EMI requirements.
CIN and COUT Selection
The input capacitance, CIN, is needed to filter the trapezoidal current at the source of the top MOSFET. To prevent large ripple voltage, a low ESR input capacitor sized
for the maximum RMS current should be used.RMS current is given by :
IRMS = I OUT ( max ) ⋅
VOUT
⋅
VIN
VIN
VOUT
−1
This formula has a maximum at V IN = 2V OUT, where IRMS
= IOUT/2. This simple worst-case condition is commonly
used for design because even significant deviations do
not offer much relief. Note that ripple current ratings from
capacitor manufacturers are often based on only 2000
hours of life which makes it advisable to further derate the
capacitor, or choose a capacitor rated at a higher temperature than required.
Rev.A.05
Several capacitors may also be paralleled to meet size
or height requirements in the design. The selection of
COUT is determined by the effective series resistance
(ESR) that is required to minimize voltage ripple and load
step transients, as well as the amount of bulk capacitance that is necessary to ensure that the control loop is
stable. Loop stability can be checked by viewing the load
transient response as described in a later section.
The output ripple, VOUT, is determined by :

1

∆ VOUT ≤ ∆ IL ESR +

8 f ⋅ C OUT 

The output ripple is highest at maximum input voltage
since IL increases with input voltage. Multiple capacitors
placed in parallel may be needed to meet the ESR and
RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic and ceramic capacitors are all available in surface mount packages. Special
polymer capacitors offer very low ESR but have lower
capacitance density than other types. Tantalum capacitors have the highest capacitance density but it is important to only use types that have been surge tested for
use in switching power supplies. Aluminum electrolytic
capacitors have significantly higher ESR but can be used
in cost-sensitive applications provided that consideration
is given to ripple current ratings and long term reliability.
Ceramic capacitors have excellent low ESR characteristics but can have a high voltage coefficient and audible
piezoelectric effects. The high Q of ceramic capacitors
with trace inductance can also lead to significant ringing
Using Ceramic Input and Output Capacitors
Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high ripple
current, high voltage rating and low ESR make them ideal
for switching regulator applications. However, care must
be taken when these capacitors are used at the input and
output. When a ceramic capacitor is used at the input
and the power is supplied by a wall adapter through long
wires, a load step at the output can induce ringing at the
input, VIN. At best, this ringing can couple to the output
and be mistaken as loop instability. At worst, a sudden
inrush of current through the long wires can potentially
cause a voltage spike at VIN large enough to damage the
part.
9
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
Output Voltage Programming
The output voltage is set by an external resistive divider
according to the following equation :
VOUT = V REF ⋅ (1 +
VIN
2.5V to 5.5V
2.2µH
IN
R2
)
R1
SW
22pF
AME5258
EN
Where VREF equals to 0.6V typical. The resistive divider allows the FB pin to sense a fraction of the output
voltage as shown in Figure 4.
0.6V ≤ VOUT
VOUT
1.2V
C OUT
10µF
CER
FB
604K
COUT
4.7µF
CER
GND
604K
≤ 5.5V
Figure 5: 1.2V Step-Down Regulator
R2
FB
AME5258
VIN
3.3V to 5.5V
R1
2.2µH
IN
SW
22pF
GND
AME5258
EN
Figure 4: Setting the AME5258 Output Voltage
FB
VOUT
1.5V
C OUT
10µF
CER
475K
COUT
4.7µF
CER
GND
316K
Thermal Considerations
In most applications the AME5258 does not dissipate
much heat due to its high efficiency. But, in applications
where the AME5258 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 160O C, both power
switches will be turned off and the SW node will become
high impedance. To avoid the AME5258 from exceeding
the maximum junction temperature, the user will need to
do some thermal analysis. The goal of the thermal analysis is to determine whether the power dissipated exceeds
the maximum junction temperature of the part. The temperature rise is given by:
Figure 6: 1.5V Step-Down Regulator
VIN
2.7V to 5.5V
2.2µH
IN
SW
22pF
AME5258
EN
C OUT
4.7µF
CER
VOUT
2.5V
C OUT
10µF
CER
FB
1M
GND
316K
TR = ( PD)( θJA )
Where PD is the power dissipated by the regulator and
θJA is the thermal resistance from the junction of the die
to the ambient temperature.
10
Figure 7: 2.5V Step-Down Regulator
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
VIN
3.3V to 5.5V
VOUT
3V
2.2µH
IN
SW
22pF
2.2µH
IN
SW
22pF
C OUT
10µF
CER
AME5258
EN
VIN
3.6V to 5.5V
AME5258
FB
EN
887K
C OUT
4.7µF
CER
GND
240K
C OUT
10µF
CER
FB
960K
COUT
4.7µF
CER
VOUT
3.3V
GND
196K
Figure 8: 3V Step-Down Regulator
Figure 9: 3.3V Step-Down Regulator
PC Board Layout Checklist
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the
AME5258. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the V IN trace should be kept short, direct and wide.
2. Does the V FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between
the (+) plate of COUT and ground.
3. Does the (+) plate of CIN connect to V IN as closely as possible? This capacitor provides the AC current to the internal
power MOSFETs.
4. Keep the switching node, SW, away from the sensitive VFB node.
5. Keep the (-) plates of CIN and COUT as close as possible.
VIN
L1
IN
SW
AME5258
EN
+
CIN
-
CFWD
+
L1
IN
SW
AME5258
COUT
-
FB
+
GND
R1
V OUT
EN
R2
Figure 10: AME5258 Adjustable Voltage
Regulator Layout Diagram
Rev.A.05
VIN
VOUT
CIN
VOUT
+
COUT
-
GND
-
Figure 11: AME5258 Fixed Voltage
Regulator Layout Diagram
11
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
Start-UP form Shutdown
Pluse Skipping Mode
RUN
2V /Div
SW
5V /Div
VOUT
VOUT
10mV/Div
1V/Div
IL
IL
20mA/Div
500mA/Div
VIN=3.6V
VOUT=1.8V
ILOAD=600mA
200µS/Div
VIN=3.6V
VOUT=1.8V
IOUT =50mA
Pluse Skipping Mode
1µS/Div
Pluse Skipping Mode
SW
5V/Div
SW
5V/Div
VOUT
10mV/Div
VOUT
10mV/Div
IL
IL
20mA/Div
VIN=3.6V
VOUT=1.8V
IOUT=10mA
20mA/Div
VIN=3.6V
VOUT=1.8V
IOUT=20mA
1µS/Div
Load Step
1µS/Div
Efficiency vs Input voltage
100
95
IL
500mA/Div
IOUT=100mA
IOUT=200mA
90
Efficiency(%)
VOUT
100mV/Div
AC COUPLED
85
80
75
IOUT =600mA
IOUT =10mA
70
65
IOUT
500mA/Div
20µS/Div
VIN=3.6V
VOUT=1.8V
ILOAD=0mA to 600mA
12
60
55
50
2.5
3
3.5
4
4.5
5
5.5
Input Voltage(V)
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
Oscillator Frequency VS Supply Voltage
2.0
1.9
1.9
1.8
1.8
Frequency(MHz)
Frequency(MHz)
Oscillator Frequency VS Temperature
2.0
1.7
1.6
1.5
1.4
1.6
1.5
1.4
1.3
1.3
1.2
-50
1.7
1.2
-25
0
+25
+50
+75
+100
1.1
2.5
+125
3.5
o
4.5
5.5
Supply Voltage (V)
Temperature( C)
VFB vs Temperature
RDS(ON) vs Input voltage
0.615
0.7
0.612
0.6
Main Switch
0.609
RDS(ON) (mΩ)
VFB(V)
0.606
0.603
0.600
0.597
0.594
0.5
0.4
0.3
Synchronous
Switch
0.2
0.591
0.1
0.588
0.585
-50
-25
0
+25
+50
+75
+100
0
2.5
+125
3.5
o
4.5
5.5
Temperature( C)
Input Voltage(V)
RDS(ON) vs Temperature
Efficiency vs Load Current
0.80
6.5
100
0.75
VIN=3.6V
80
VIN =4.2V
0.60
Efficiency(%)
RDS(ON) (mΩ)
0.65
90
VIN =2.7V
0.70
0.55
0.50
0.45
0.40
0.35
70
60
50
40
Main Switch
Synchronous Switch
0.30
V IN =2.7V
V IN =3.3V
V IN =4.2V
30
V OUT=1.2V
0.25
0.20
-50
-25
0
+25
+50
+75
Temperature( oC)
Rev.A.05
+100
+125
20
1
10
100
1000
I OUT (mA)
13
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
Efficiency vs Load Current
Efficiency vs Load Current
100
95
90
85
Efficiency(%)
80
Efficiency(%)
VIN =2.7V
90
V IN =2.7V
70
VIN=3.3V
60
50
V IN =4.2V
V IN =3.6V
80
75
70
V IN =4.2V
65
40
60
30
VOUT =1.5V
20
1
10
100
VOUT =1.8V
55
50
1
1000
IOUT (mA)
Efficiency vs Load Current
100
1000
Output Voltage vs Load Current
95
1.834
VIN=2. 7V
1.824
85
80
VOUT (V)
Efficiency(%)
IOUT (mA)
1.844
100
90
10
V IN =3.6V
75
70
V IN =4.2V
65
1.814
1.804
1.794
60
VOUT =2.5V
55
50
1
10
IOUT (mA)
100
1.784
1000
1.774
0
100
200
300
400
500
600
700
800
900
I OUT (mA)
Current Limit vs Input Voltage
1800
Current Limit (A)
1700
1600
1500
1400
1300
1200
1100
1000
2.5
3.0
3. 5
4.0
4.5
o
5. 0
5.5
Temperature ( C)
14
Rev.A.05
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Date Code Rule
Month Code
1: January 7: July
2: February 8: August
3: March
9: September
4: April
A: October
5: May
B: November
6: June
C: December
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Marking
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
M
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Year
xxx0
xxx1
xxx2
xxx3
xxx4
xxx5
xxx6
xxx7
xxx8
xxx9
n Tape and Reel Dimension
SOT-25
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
Rev.A.05
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOT-25
8.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
15
AME
1.5MHz, 600mA
Synchronous Buck Converter
AME5258
n Package Dimension
SOT-25
Top View
Side View
SYMBOLS
D
E
H
θ1
L
PIN1
S1
MAX
MIN
MAX
A
0.90
1.30
0.0354
0.0512
A1
0.00
0.15
0.0000
0.0059
b
0.30
0.55
0.0118
0.0217
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
1.90 BSC
e
2.60
θ1
3.00
0
o
10
0.95BSC
0.10236 0.11811
0.0146BSC
o
0
o
10
o
0.0374BSC
A1
A
S1
0.07480 BSC
0.37BSC
L
Front View
INCHES
MIN
H
e
MILLIMETERS
b
16
Rev.A.05
www.ame.com.tw
E-Mail: [email protected]
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. , February 2009
Document: 1265-DS5258-A.05
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District
Taipei 114, Taiwan.
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989
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