PCN20101001

Product Change Notices
PCN No.: 20101001
Date: 10/05/2010
This is to inform you that AME5250 datasheet has been changed from Rev. A.07 to
Rev. B.01. This notification is for your information and concurrence.
If you require data or samples to qualify this change, please contact AME, Inc.
within 30 days of receipt of this notification.
If we do not receive any response from you within 30 calendar days from the
date of this notification, we will consider that you have accepted this PCN.
If you have any questions concerning this change, please contact:
PCN Originator:
Name: Bill Chou
Email: [email protected]
Expected 1st Device Shipment Date: N/A
Earliest Year/Work Week of Changed Product: N/A
Description of Change :
To correct QFN-16C(3mmx3mmx0.75mm) package dimension.
From:
To:
Reason for Change:
To correct package dimension.
QPM018B-B
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n General Description
n Applications
The AME5250 is a high efficiency monolithic synchro-
l
Cellular Telephones
nous buck regulator using a constant frequency, current
l
Personal Information Appliances
mode architecture. Capable of delivering 1A output cur-
l
Wireless and DSL Modems
rent over a wide input voltage range from 2.5V to 5.5V,
l
MP3 Players
the AME5250 is ideally suited for single Li-Ion battery
l
Portable Instruments
powered applications. 100% duty cycle provides low
dropout operation, extending battery life in portable systems. Under light load conditions, the AME5250 operates in a power saving mode that consumes just around
20µA of supply current, maximizing battery life in portable applications.
n Typical Application
Fixed Output Voltage
2.2µH
VIN
IN
V OUT
SW
The internal synchronous switch increases efficiency
and eliminates the need for an external Schottky diode.
Low output voltages are easily supported with the 0.6V
CIN
4.7µF
CER
feedback reference voltage. The AME5250 is available
AME5250
COUT
10µF
CER
OUT
EN
GND
in small DFN-6D & QFN-16C packages.
Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.
Figure 1: High Efficiency Step-Down Conventer
n Features
Adjustable Output Voltage
l High Efficiency: Up to 95%
l Very Low 20µA Quiescent Current
l High efficiency in light load condition
l 2.5V to 5.5V Input Range
l Adjustable Output From 0.6V to VIN
l 1.0V, 1.2V, 1.5V, 1.6V, 1.8V, 2.5V and
VIN = 2.5V to 5.5V
VIN
IN
CIN
4.7µF
CER
2.2µH
V OUT
SW
AME5250
1.8V
1000mA
22pF
R1
150K
FB
EN
GND
3.3V Fixed/Adjustable Output Voltage
l 1A Output Current
COUT
10µF
CER
R2
75K
l Low Dropout Operation: 100% Duty Cycle
l No Schottky Diode Required
VOUT=VFB (R1+R2)/R2
l 1.5MHz Constant Frequency PWM Operation
Figure 2: 1.8V at 1000mA Step-Down Requlator
l Small DFN-6D & QFN-16C Packages
l All AME’ s Lead Free Product Meet RoHS
Standard
Rev.B.01
1
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Function Block Diagram
Constant
Off-time
Mode
Select
Slope
COMP
VIN
IN
3
PWM
COMP
FB/ VOUT
6
0.6V
0.6V
VREF
SW
LOGIC
4
0.55V
UVDET
Soft
Start
EN
2
NMOS
COMP
IRCOMP
OSC
GND
5
Figure 3: Founction Block Diagram
2
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Pin Configuration
1. NC
12
4. SW
3
16
2
AME5250
15
5. GND
6. FB/OUT
1
9
14
3. IN
AME5250
10
13
2. EN
11
8
4
7
5
AME5250-AWExxx
9. IN
1. GND
1
2
3
2. GND
10. IN
3. GND
11. IN
4. FB/OUT
12. IN
6
6
AME5250-AVYxxx
QFN-16C
(3mmx3mmx0.75mm)
Top View
5. GND
13. SW
5
DFN-6D
(2mmx2mmx0.75mm)
Top View
6. NC
14. SW
7. EN
15. SW
8. NC
16. NC
4
Die Attach:
Die Attach:
Conductive Epoxy
Conductive Epoxy
Note:
The area enclosed by dashed line represents Exposed Pad and connect to GND.
n Pin Description
AME5250-AVYxxx DFN-6D(2mmx2mmx0.75mm)
Pin Number
Pin Name
Pin Description
1
NC
No connection. Not internally connected. Can left floating or connected
to GND.
2
EN
Enable Control Input, active high.
3
IN
Input Supply Voltage Pin.
Bypass this pin with a capacitor as close to the device as possible.
4
SW
Switch Node Connection to Inductor.
5
GND
Ground. Tie directly to ground plane.
6
FB/OUT
Rev.B.01
Output voltage Feedback input.
3
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Pin Description
AME5250-AWExxx QFN-16C(3mmx3mmx0.75mm)
4
Pin Number
Pin Name
Pin Description
1
GND
Ground. Tie directly to ground plane.
2
GND
Ground. Tie directly to ground plane.
3
GND
Ground. Tie directly to ground plane.
4
FB/OUT
5
GND
6
NC
No connection. Not internally connected. Can left floating or connected
to GND.
7
EN
Enable Control Input, active high.
8
NC
No connection. Not internally connected. Can left floating or connected
to GND.
9
IN
Input Supply Voltage Pin.
Bypass this pin with a capacitor as close to the device as possible.
10
IN
Input Supply Voltage Pin.
Bypass this pin with a capacitor as close to the device as possible.
11
IN
Input Supply Voltage Pin.
Bypass this pin with a capacitor as close to the device as possible.
12
IN
Input Supply Voltage Pin.
Bypass this pin with a capacitor as close to the device as possible.
13
SW
Switch Node Connection to Inductor.
14
SW
Switch Node Connection to Inductor.
15
SW
Switch Node Connection to Inductor.
16
NC
No connection. Not internally connected. Can left floating or connected
to GND.
Output voltage Feedback input.
Ground. Tie directly to ground plane.
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Ordering Information
AME5250 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration & Special Feature
Pin Configuration &
Special Feature
A
(DFN-6D)
A
(QFN-16C)
Rev.B.01
1. NC
2. EN
3. IN
4. SW
5. GND
6. FB/OUT
1. GND
2. GND
3. GND
4. FB/OUT
5. GND
6. NC
7. EN
8. NC
9. IN
10. IN
11. IN
12. IN
13. SW
14. SW
15. SW
16. NC
Package
Type
V: DFN
W: QFN
Number of
Pins
Y: 6
E: 16
Output Voltage
100:
120:
150:
160:
180:
250:
330:
ADJ:
1.0V
1.2V
1.5V
1.6V
1.8V
2.5V
3.3V
Adjustable
5
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Available Opetions
Part Number
Marking*
Output Voltage
Package
Operating Ambient
Temperature Range
AME5250-AVYADJ
5250
AMXX
ADJ
DFN-6D
-40oC to +85oC
AME5250-AVY120
5250
BMXX
1.2V
DFN-6D
-40oC to +85oC
AME5250-AVY180
5250
CMXX
1.8V
DFN-6D
-40oC to +85oC
AME5250-AVY330
5250
DMXX
3.3V
DFN-6D
-40oC to +85oC
AME5250-AWEADJ
A5250
AMyMXX
ADJ
QFN-16C
-40oC to +85oC
Note:
1. The first 1 or 2 places represent product code. It is assigned by AME such as A or AM.
2. y is year code and is the last number of a year. Such as the year code of 2008 is 8.
3. A bar on top of first letter represents Green Part such as 5250 or A5250.
4. 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.
5. Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package
type.
n Absolute Maximum Ratings
Parameter
Input Supply Voltage
EN, VOUT Voltage
SW Voltage
ESD Classification
Symbol
Maximum
VIN
-0.3 to 6.5
VEN , VOUT
-0.3 to VIN
VSW
-0.3 to VIN
Unit
V
B*
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device.
* HBM B: 2000V~3999V
6
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Recommended Operating Conditions
Parameter
Symbol
Rating
Unit
Supply Voltage Voltage
VIN
2.5 to 5.5
V
Ambient Temperature Range
TA
-40 to +85
o
C
Junction Temperature Range
TJ
-40 to +125
o
C
n Thermal Information
Parameter
Package
Die Attach
Thermal Resistance*
(Junction to Case)
Symbol
Maximum
θJC
85
Unit
o
C/W
Thermal Resistance
(Junction to Ambient)
θJA
160
Internal Power Dissipation
PD
625
Thermal Resistance*
(Junction to Case)
θJC
67
DFN-6D
Conductive Epoxy
mW
o
C/W
Thermal Resistance
(Junction to Ambient)
QFN-16C
Internal Power Dissipation
Solder Iron (10Sec)**
Conductive Epoxy
θJA
149
PD
670
350
mW
o
C
* Measure θJC on backside center of Exposed Pad.
** MIL-STD-202G 210F
Rev.B.01
7
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Electrical Specifications
VIN=3.6V, VOUT=2.5V, VFB=0.6V, L=2.2µH, CIN=4.7µF, COUT=10µF, TA=25oC, IMAX=1A unless otherwise specified.
Parameter
Input voltage
Test Condition
VIN
VIN =2.5 to 5.5V, in PWM mode
For Fixed Output Voltage
Min
Typ
Max
Units
2.5
5.5
V
-3
3
%
VFB
VIN-0.2
V
0.612
V
50
nΑ
Output Voltage Accuracy
∆VOUT
Adjustable Output Range
Vout
Feedback Voltage
VFB
For Adjustable OutputVoltage
0.588
Feedback Pin Bias Current
IFB
VFB=VIN
-50
Quiescent Current
(For Adjustable Output Voltage)
IQ
IOUT=0mA, VFB=1V
20
35
µA
Quiescent Current
(For Fixed Output Voltage)
IQ
IOUT=0mA, in PFM mode
35
40
µA
Shutdown Current
ISHDN
VEN =GND
0.1
1
µA
Switch Frequency
fOSC
1.5
1.8
MHz
1.2
0.6
High-side Switch On-Resistance
RDS,ON, LHI
ISW =200mA, VIN =3.6V
0.28
Ω
Low-side Switch On-Resistance
RDS,ON, LO
ISW =200mA, VIN =3.6V
0.25
Ω
Switch Current Limit
ISW,CL
VIN =2.5 to 5.5V
1.4
1.6
A
EN High (Enabled the Device)
VEN,HI
VIN =2.5 to 5.5V
1.5
EN Low (Shutdown the Device)
VEN,LO
VIN =2.5 to 5.5V
Input Undervoltage Lockout
VUVLO
rising edge
Input Undervoltage Lockout
Hysteresis
VUVLO,HYST
Thermal Shutdown Temperature
OTP
Maximum Duty Cycle
DMAX
SW Leakage Current
8
Symbol
V
0.4
Shutdown, temperature increasing
1.8
V
0.1
V
o
160
100
EN=0V, VIN =5.0V
VSW=0V or 5.0V
-1
V
C
%
1
µA
Rev. B.01
AME
AME5250
1A, 1.5MHz Synchronous
Step-Down Converter
n Detailed Description
Main Control Loop
AME5250 uses a constant frequency, current mode
step-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET)
switches are intermal. 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 resets the RS latch. 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.
Short-Circuit Protection
When the output is shorted to ground, the frequency of
the oscillator is reduced to about 180KHz. This frequency
foldback ensures that the inductor current hsa more time
do decay, thereby preventing runaway. The oscillator’ s
frequency will progressively increase to 1.5MHz when V FB
or VOUT rises above 0V.
Dropout Operation
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.
n Application Information
The basic AME5250 application circuit is shown in Typical Application Circuit. External component selection is
determined by the maximum load current and begins with
the selection of the inductor value and followed by CIN and
COUT.
Inductor Selecton
For a given input and output voltage, the inductor value
and operating frequency determine the ripple current. The
ripple current DIL increases with higher V IN and decreases
with higher inductance.
∆ IL=
Rev.B.01
VOUT
1
⋅ V OUT (1 −
)
f ⋅L
VIN
A reasonable starting point for setting ripple current is
∆IL=0.4(lmax). 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 DC-resistance inductor.
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 voltage transients, a low ESR input
capacitorsized for the maximum RMS current must be
used. The maximum RMS capacitor current is given by:
IRMS = IOUT ( max ) ⋅
VOUT
⋅
VIN
VIN
VOUT
−1
This formula has a maximum at VIN=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 the capacitor
manufacturer ripple current ratings are often based on 2000
hours of life. This makes it advisable to further derate the
capacitor, or choose a capacitor rated at a higher temperature than required.
The selection of COUT is determined by the effective
series resistance(ESR) that is required to minimize voltage ripple and load step transients. The output ripple,
VOUT, is determined by:

1

∆ VOUT ≤ ∆ IL ESR +

8 f ⋅ C OUT 

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
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
Output Voltage Programming
The output voltage is set by an external resistive divider
according to the following equation :
VOUT = VREF
2.2µH
2.5V to 5.5V
IN
SW
22pF
AME5250
R1
)
⋅ (1 +
R2
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.
C OUT
10µF
CER
FB
150K
C IN
4.7µF
CER
0.6V ≤ VOUT ≤ 5.5V
VOUT
1.2V
GND
150K
Figure 5: 1.2V Step-Down Regulator
R1
VIN
3.3V to 5.5V
FB
AME5250
2.2µH
IN
SW
R2
22pF
AME5250
GND
EN
Figure 4: Setting the AME5250 Output Voltage
In most applications the AME5250 does not dissipate
much heat due to its high efficiency. But, in applications
where the AME5250 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 AME5250 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:
TR = ( PD)( θJA )
C OUT
10µF
CER
150K
CIN
4.7µF
CER
Thermal Considerations
FB
VOUT
1.5V
GND
100K
Figure 6: 1.5V Step-Down Regulator
VIN
2.7V to 5.5V
2.2µH
IN
SW
22pF
AME5250
EN
C IN
4.7µF
CER
VOUT
2.5V
C OUT
10µF
CER
FB
150K
GND
47.3K
Figure 7: 2.5V Step-Down Regulator
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
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
VIN
2.5V to 5.5V
VOUT
1.6V
2.2µH
IN
SW
22pF
150K
EN
90K
FB
150K
CIN
4.7µF
CER
GND
C OUT
10µF
CER
AME5250
FB
CIN
4.7µF
CER
VOUT
3.3V
2.2µH
SW
IN
22pF
C OUT
10µF
CER
AME5250
EN
VIN
3.6V to 5.5V
GND
33.3K
Figure 8: 1.6V 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
AME5250. 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 R2/R1 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.
L1
V IN
L1
V IN
EN
R1
AME5250
CIN
COUT
FB
V OUT
SW
IN
C1
AME5250
CIN
VOUT
SW
IN
EN
OUT
COUT
R2
GND
NC
AME5250
AME5250
NC
1
EN
2
6
5
FB
GND
L1
VIN
3
4
Output capacitor
must be near
AME5250
CIN
1
6
VOUT
EN
2
5
GND
3
VIN
4
Output capacitor
must be near
AME5250
SW
R1
C1
SW should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
Figure 10: AME5250 Adjustable Voltage
Regulator Layout Diagram
Rev.B.01
NC
L1
SW
COUT
C IN must be placed
between VDD and
GND as closer as
possible
GND
NC
COUT
R2
CIN
CIN must be placed
between V DD and
GND as closer as
possible
SW should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace
Figure 11: AME5250 Fixed Voltage
Regulator Layout Diagram
11
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Application Information
External components selection
Supplier
Inductance
(µH)
Current Rating
(mA)
DCR
(mΩ )
Dimensions
(mm)
Series
TAIYO YUDEN
2.2
1480
60
3.00 x 3.00 x 1.50
NR 3015
GOTREND
2.2
1500
58
3.85 x 3.85 x 1.80
GTSD32
Sumida
2.2
1500
75
4.50 x 3.20 x 1.55
CDRH2D14
Sumida
4.7
1000
135
4.50 x 3.20 x 1.55
CDRH2D14
TAIYO YUDEN
4.7
1020
120
3.00 x 3.00 x 1.50
NR 3015
GOTREND
4.7
1100
146
3.85 x 3.85 x 1.80
GTSD32
Table 1. Recommended Inductors
Supplier
Capacitance
(µH)
Package
Part Number
TDK
4.7
603
C1608JB0J475M
MURATA
4.7
603
GRM188R60J475KE19
TAIYO YUDEN
4.7
603
JMK107BJ475RA
TAIYO YUDEN
10
603
JMK107BJ106MA
TDK
10
805
C2012JB0J106M
MURATA
10
805
GRM219R60J106ME19
MURATA
10
805
GRM219R60J106KE19
TAIYO YUDEN
10
805
JMK212BJ106RD
Table 2. Recommended Capacitors for CIN and COUT
12
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Characterization Curve(For reference only)
Efficiency vs. Output Current
Efficiency vs. Output Current
100
100
Efficiency(%)
Efficiency(%)
90
VIN = 2.7V
90
80
70
60
80
70
60
50
50
VOUT = 2.5V
40
0.1
V IN = 3.6V
1
COUT = 10µF L = 2.2µH
10
100
VOUT = 2.5V
40
0.1
1000
1
C OUT = 10µ F L = 2.2µH
10
100
Efficiency vs. Output Current
Efficiency vs. Output Current
100
100
90
90
Effici ency(%)
Efficiency(%)
VIN = 2.7V
80
70
60
50
VIN = 3.6V
80
70
60
50
VOUT = 1.5V
40
0.1
1
COUT = 10µF L = 2.2µH
10
100
VOUT = 1.5V
40
0.1
1000
1
COUT = 10µF L = 2.2µH
10
100
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
Efficiency vs. Output Current
V IN = 2.5V
VIN = 5.5V
90
Efficiency(%)
Efficiency(%)
90
80
70
60
80
70
60
50
50
VOUT = 1.2V
1
V OUT = 1.2V
COUT = 10µF L = 2.2µH
10
100
Output Current(mA)
Rev.B.01
1000
100
100
40
0.1
1000
Output Current (mA)
Output Current(mA)
1000
40
0.1
1
COUT = 10µF L = 2.2µH
10
100
1000
Output Current(mA)
13
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Characterization Curve(For reference only)
Reference Voltage vs. Temperature
Frequency vs. Temperature
1.70
0.620
1.65
1.60
0.610
Frequency(MHz)
Reference Voltage(V)
0.615
0.605
0.600
0.595
0.590
1.45
1.40
1.35
1.30
1.25
-25
0
+25
+50
+75
+100
V IN = 3.6V
1.15
1.10
+125
-50
+25
+50
+75
+100
+125
Temperature ( C)
Frequency vs. Supply Voltage
Output Voltage vs. Output Current
1.90
1.65
1.89
1.60
1.88
1.55
1.87
1.50
1.45
1.40
1.35
1.30
1.25
VOUT = 1.8V
VIN = 3.6V
1.86
1.85
1.84
1.83
1.82
1.81
1.80
1.79
1.15
1.78
1.10
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.77
100
200
300
400
500
600
700
800
900
VIN(V)
Output Current(mA)
Current Limit vs. Temperature
Current Limit vs. Temperature
VIN = 3.3V
VOUT = 1.2V
Current Limit(A)
Current Limit(A)
0
o
1.70
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
-40
-25
Temperature (oC)
Output Voltage(V)
Frequency(MHz)
VIN = 3.6V
1.20
-25
-10
+5
+20 +35 +50
+65 +80 +95 +110 +125
o
Temperature ( C)
14
1.50
1.20
0.585
0.580
-50
1.55
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
-40
1000
VIN = 3.6V
VOUT = 1.2V
-25
-10
+5
+20
+35 +50
+65 +80
+95 +110 +125
Temperature (oC)
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Characterization Curve(For reference only)
Current Limit(A)
Current Limit vs. Temperature
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
-40
Light Load Mode output voltage ripple
VIN = 5.0V
VOUT = 1.2V
1
2
3
-25
-10
+5
5µS / div
+20 +35 +50 +65 +80 +95 +110 +125
o
Temperature ( C)
VIN = 3.6V
VOUT = 1.8V
IOUT = 50mA
1) VSW= 5V/div
2) VOUT = 100mV/div
3) IL = 200mA/div
Power Off from EN
Load Step
1
1
2
2
3
50µS / div
Rev.B.01
40µS / div
VIN = 3.6V
VOUT = 1.8V
IOUT = 1A
VIN = 3.6V
VOUT = 1.8V
IOUT = 0A~1A~0A
1) EN = 2V/div
2) VOUT = 2V/div
3) IL = 500mA/div
1) VOUT= 100mV/div
2) IOUT = 500mA/div
15
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Characterization Curve(For reference only)
Load Step
Load Step
1
1
2
2
40µS / div
40µS / div
VIN = 3.6V
VOUT = 1.8V
IOUT = 50mA~1A~50mA
VIN = 3.6V
VOUT = 1.8V
IOUT = 100mA~1A~100mA
1) VOUT= 100mV/div
2) IOUT = 500mA/div
1) VOUT= 100mV/div
2) IOUT = 500mA/div
Load Step
1
Power On from EN
1
2
2
3
400µS / div
40µS / div
16
VIN = 3.6V
VOUT = 1.8V
IOUT = 200mA~1A~200mA
VOUT = 1.2V
IOUT = 1A
1) VOUT= 100mV/div
2) IOUT = 500mA/div
1) EN= 2V/div
2) VOUT = 500mV/div
3) IL = 1A/div
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
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
Marking
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
M
A
A
A
A
A
A
A
A
A
A
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
DFN-6D
(2mmx2mmx0.75mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
Rev.B.01
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
DFN-6D
(2x2x0.75mm)
8.0±0.1 mm
4.0±0.1 mm
3000pcs
180±1 mm
17
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Tape and Reel Dimension
QFN-16C
(3mmx3mmx0.75mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
18
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
QFN-16C
(3x3x0.75mm)
12.0±0.1 mm
4.0±0.1 mm
3000pcs
330±1 mm
Rev. B.01
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Package Dimension
DFN-6D
(2mmx2mmx0.75mm)
D
e
b
E
L
E1
PIN 1 IDENTIFICATION
D1
TOP VIEW
A
BOTTOM VIEW
G1
G
REAR VIEW
SYMBOLS
Rev.B.01
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
D
1.900
2.100
0.075
0.083
E
1.900
2.100
0.075
0.083
e
0.600
0.700
0.024
0.028
D1
1.100
1.300
0.043
0.051
E1
0.600
0.800
0.024
0.031
b
0.180
0.300
0.007
0.012
L
0.250
0.450
0.010
0.018
G
0.178
0.228
0.007
0.009
G1
0.000
0.050
0.000
0.002
19
AME
1A, 1.5MHz Synchronous
Step-Down Converter
AME5250
n Package Dimension
QFN-16C
(3mmx3mmx0.75mm)
e
b
E1
E
k
L
D
D1
PIN 1 IDENTIFICATION
Bottom View
A3
A
A1
Top View
Real View
Real View
SYMBOLS
INCHES
MIN
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A3
0.203REF.
0.008REF.
D
2.924
3.076
0.115
0.121
E
2.924
3.076
0.115
0.121
D1
1.600
1.800
0.063
0.071
E1
1.600
1.800
0.063
0.071
k
b
e
L
20
MILLIMETERS
0.200MIN.
0.180
0.280
0.500TYP.
0.324
0.476
0.008MIN.
0.007
0.011
0.020TYP.
0.013
0.019
Rev. B.01
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. , October 2010
Document: 1283-DS5250-B.01
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