AME5252/DC-DC Buck Converter

AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n General Description
n Features
l High Efficiency: Up to 96%
The AME5252 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power
applications, it operates from 2.5V to 5.5V input voltage
range and has a constant 1.5MHz switching frequency,
allowing the use of tiny, low cost capacitors and inductors
2mm or less in height. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power
switches provide high efficiency without the need for external Schottky diodes.
l Internal soft start
l 1.5MHz Constant Frequency Operation
l High Switch Current: 1A on Each Channel
l No Schottky Diodes Required
l Low RDSON Internal Switches: 0.35Ω
l Current Mode Operation for Excellent Line
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle).
In shutdown model, the device draws <1µA.
and Load Transient Response
l Short-Circuit Protected
l Low Dropout Operation: 100% Duty Cycle
n Applications
l Ultralow Shutdown Current: IQ<1µA
l Output Voltages from 5V down to 0.6V
l PDAs/Palmtop PCs
l Power-On Reset Output
l Digital Cameras
l Externally Synchronizable Oscillator
l Cellular Phones
l All AME’ s Lead Free Products Meet RoHS
l Portable Media Players
Standards
l PC Cards
l Wireless and DSL Modems
n Typical Application
C
V IN
2.8V~5.5V
C IN
10µF
EN2
IN
SYNC
V OUT2 = 2.5V
CF2
22pF
COUT 2
10µF
L2
2.2µ H
EN1
RESET
PORB
AME5252
L1
2.2µ H
SW1
SW2
VOUT 1 = 1.8V
S
R2
887KΩ
R4
887KΩ
VFB2
R3
280KΩ
R5
100KΩ
GND/PGND
VFB1
R1
442KΩ
CF1
22pF
COUT 1
10µF
Figure 1. 2.5V/1.8V at 600mA Step-Down Regulators
Rev.C.01
1
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Typical Application
VIN
2.5V~5.5V
CIN
10 µF
EN2
IN
SYNC
V OUT2 = 1.8V
L2
2.2µH
EN1
AME5252
L1
2.2µ H
VOUT 1 = 1.2V
SW1
SW2
R2
604KΩ
VFB2
COUT 2
10µF
RESET
PORB
R4
887KΩ
CF2
22pF
R5
100KΩ
R3
442KΩ
CF1
22pF
VFB1
COUT1
10µ F
R1
604KΩ
GND/PGND
Figure 2. 1.8V/1.2V at 600mA Step-Down Regulators
VIN
2.8V~5.5V
C IN
10µF
EN2
IN
SYNC
VOUT2 = 2.5V
CF2
22pF
L2
2.2µH
RESET
L1
2.2µH
SW1
SW2
R2
475KΩ
R4
1MΩ
R3
316KΩ
R5
100KΩ
PORB
AME 5252
VFB2
COUT 2
10µF
EN1
GND/PGND
V OUT 1 = 1.5V
CF1
22pF
VFB1
R1
316KΩ
COUT 1
10µ F
Figure 3. 2.5V/1.5V at 600mA Step-Down Regulators
2
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Typical Application
VIN
2.8V~5.5V
CIN
10µF
IN
EN2
SYNC
D1
VOUT2 = 3.3V
CF2
22pF
COUT2
10µF
L2
2.2µ H
EN1
PORB
RESET
L1
2.2µH
AME5252
SW2
R5
100KΩ
SW1
R4 M1
887KΩ
R2
887KΩ
VFB2
VFB1
GND/PGND
R3
196KΩ
R1
442KΩ
VOUT 1 = 1.8V
CF1
22pF
COUT 1
10µ F
Figure 4. 3.3V/1.8V at 600mA Step-Down Regulators
C
Rev.C.01
3
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Function Diagram
SYNC
6
CLAMP
VIN
0.6V
Slope
COMP
IN
∑
+
+
VFB1 1
3
-
0.55V
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
UVDET
+
P_ch
ANTI
SHOOT-THRU
+
4 SW1
N_ch
OVDET
0.65V +
-
IRCMP
EN1
EN2
2
9
VFB2 10
4
11 PGND
8 PORB
0.6V
VREF
OSC
PORB
COUNTER
5 GND
REGULATOR 2
7 SW2
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Pin Configuration
DFN-10B
(3mmx3mmx0.75mm)
Top View
10
9
8
7
6
AME5252
AME5252-AVBxxx
1. VFB1
7. SW2
2. EN1
8. PORB
3. IN
9. EN2
4. SW1
10. VFB2
5. GND
11. *PGND
6. SYNC
1
2
3
4
5
Die Attach:
Conductive Epoxy
Note:
* The area enclosed by dashed line represents Exposed Pad (Pin11) and must be connected to GND.
n Pin Description
Pin Number
Pin Name
1
VFB1
2
EN1
3
IN
4
SW1
5
GND
6
SYNC
The oscillation frequency can be syncronized to an external oscillator applied
to this pin and pulse skipping mode is automatically selected. Do not float this
pin.
7
SW2
Regulator 2 Switch Node Connection to the Inductor. This pin swings from VIN
to GND.
8
PORB
Power-on Reset. This common-drain logic output is pulled to GND when the
output voltage is not within 8.5% of regulation and goes high after 175ms when
both channels are within regulation.
9
EN2
Requlator 2 Enable. Output Feedback. Forcing this pin to VIN enables regulator
2, while forcing it to GND causes regulator 2 to shut down.
10
VFB2
Regulator 2 Output Feedback Reveives the feedback voltage from the external
resistive divider across the output Nominal voltage for this pin is 0.6V.
11
PGND
Must be Connected to GND.
Rev.C.01
Pin Description
Regulator 1 Output Feedback. Receives the feedback voltage from the external
resistive divider across the output. Nominal voltage for this pin is 0.6V.
Regulator 1 Enable. Forcing this pin to VIN enables regulator 1, while forcing it
to GND caused regulator 1 to shutdown.
C
Main Power Supply. Must be closely decoupled to GND.
Regulator 1 Switch Node Connection to the Inductor. This pin swings from VIN
to GND.
Main Ground. Connect to the (-) terminal of COUT, and (-) terminal of CIN .
5
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Ordering Information
AME5252 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration & Special Feature
Pin Configuration &
Special Feature
A
(DFN-10B)
6
1. VFB1
2. EN1
3. IN
4. SW1
5. GND
6. SYNC
7. SW2
8. PORB
9. EN2
10.VFB2
11.PGND
Package
Type
V: DFN
Number of
Pins
B: 10
Output Voltage
ADJ: Adjustable
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
nAvailable Options
Part Number
Marking
Output
Voltage
Package
Operating Ambient
Temperature Range
AME5252-AVBADJ
A5252
BMyMXX
ADJ
DFN-10B
-40OC to +85OC
Note:
1. The first 2 places represent product code. It is assigned by AME such as BM.
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 A5252.
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
Symbol
Maximum
IN
-0.3V to 6V
VEN , VFB
-0.3V to VIN +0.3
Input Supply Voltage
VFB1, VFB2, EN1,EN2 Voltage
SYNC ,SW1, SW2 Voltage
VSW C
Unit
V
-0.3V to VIN +0.3
B*
ESD Classification
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device.
* HBM B: 2000V ~ 3999V
n Recommended Operating Conditions
Parameter
Symbol
Rating
Ambient Temperature Range
TA
-40 to +85
o
Junction Temperature Range
TJ
-40 to +125
o
Storage Temperature Range
TSTG
-65 to +150
o
Rev.C.01
Unit
C
C
C
7
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Thermal Information
Parameter
Package
Die Attach
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Symbol
Maximum
θJC
17
Unit
o
DFN-10B
Conductive Epoxy
Internal Power Dissipation
Solder Iron (10 Sec)**
θJA
125
PD
800
350
C/W
mW
o
C
* Measure θJC on backside center of Exposed Pad.
** MIL-STD-202G 210F
8
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Electrical Specifications
VIN=3.6V, EN =VIN, TA= 25oC, CIN=10µF, ILOAD =0A, unless otherwise noted.
Parameter
Input Voltage
VIN
FB Pin Input Current
IFB
Feedback Trip Point
VFB
Reference voltage line regulation
Output voltage Load regulation
Test Condition
Symbol
Min
Typ
2.5
Max
Units
5.5
V
30
nA
0.588
0.6
0.612
V
0.585
0.6
0.615
V
REGLINE,FB
0.3
0.5
%/V
REG LOAD
0.05
o
o
-40 C≦ TA≦ +85 C
%
Quiescent Current
IQ
V FB1=VFB2=0.5V (Switching)
600
800
µA
Shutdown Current
ISHDN
EN=0V
0.1
1
µA
Switching Frequency
fOSC
1.5
1.8
MHz
0.35
0.55
Ω
Top Switch On-Resistance
Bottom switch On-Resistance
1.2
RDSON
Switch Current Limit
IC L
V IN=3V, VOUT=1.2V
Switch Leakage Current
ISW
V IN =3.6V, VEN =0V, VSW =0V or 3.6V
0.1
VFBX Ramping UP, SYNC=0V
8.5
%
V FBX Ramping Down, SYNC=0V
-8.5
%
Power-on Reset Threshold
PORB
0.95
1.2
Power-on Reset on-resistance
100
Power-on Reset delay
175
A
1
200
µA
Ω
ms
C
EN Input Threshold
(High) (Enable the device)
1.5
V
EN Threshold
EN Input Threshold
(Low) (Shutdown)
0.3
V
Thermal Shutdown Temperature
OTP
Shutdown, temperature increasing
160
Thermal Shutdown Hysteresis
OTH
Restore, temperature decreasing
20
Rev.C.01
o
C
9
AME
AME5252
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
n Detailed Description
The AME5252 uses a constant frequency, current mode
architecture. The operating frequency is set at 1.5MHz
and can be synchronized to an external oscillator. Both
channels share the same clock and run in-phase.
The output voltage is set by an external divider returned
to the VFB pins. An error amplifier compares the divided
output voltage with a reference voltage of 0.6V and adjusts
the peak inductor current accordingly. Overvoltage and
undervoltage comparators will pull the PORB output low if
the output voltage is not within 8.5%. The PORB output
will go high after 262,144 clock cycles (about 175ms) of
achieving regulation.
Dropout Operation
When the input supply voltage decreases toward the
output voltage, the duty cycle increases to 100% which is
the dropout condition. In dropout, the P-channel MOSFET
switch is turned on continuously with the output voltage
being equal to the input voltage minus the voltage drops
across the internal P-channel MOSFET and the inductor.
An important design consideration is that the RDSON of
the P-channel switch increases with decreasing input supply voltage (See Typical Performance Characteristics).
Therefore, the user should calculate the power dissipation when the AME5252 is used at 100% duty cycle with
low input voltage.
Main Control Loop
During normal operation, the top power switch (P-channel MOSFET) is turned on at the beginning of a clock
cycle when the VFB voltage is below the reference voltage.
The current into the inductor and the load increases until
the current limit is reached. The switch turns off and energy stored in the inductor flows through the bottom switch
(N-channel MOSFET) into the load until the next clock
cycle.
The peak inductor current is controlled by the internally
compensated COMP voltage, which is the output of the
error amplifier. This amplifier compares the VFB pin to the
0.6V reference. When the load current increases, the V FB
voltage decreases slightly below the reference. This decrease causes the error amplifier to increase the COMP
voltage until the average inductor current matches the new
load current. The main control loop is shut down by pulling the EN pin to ground.
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.
10
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 VIN or VOUT 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+
c
120mA). For better efficiency, choose a low DC-resistance
inductor.
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
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.
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
CIN and COUT Selection
capacitors have significantly higher ESR but can be used
The input capacitance, CIN, is needed to filter the trap- C in cost-sensitive applications provided that consideration
ezoidal current at the source of the top MOSFET. To preis given to ripple current ratings and long term reliability.
vent large ripple voltage, a low ESR input capacitor sized
Ceramic capacitors have excellent low ESR characterisfor the maximum RMS current should be used.RMS curtics but can have a high voltage coefficient and audible
rent is given by :
piezoelectric effects. The high Q of ceramic capacitors
with trace inductance can also lead to significant ringing
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.C.01
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.
11
AME
AME5252
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
Thermal Considerations
In most applications the AME5252 does not dissipate
much heat due to its high efficiency. But, in applications
where the AME5252 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 AME5252 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 )
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.
12
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
Start-UP form Shutdown
Pluse Skipping Mode
EN
5V /Div
VSW
5V /Div
VOUT
1V/Div
VOUT
10mV/Div
IL
500mA/Div
VIN=3.6V
VOUT =1.8V
IOUT=800mA
ISW
200mA/Div
50µS/Div
VIN=3.6V
VOUT=1.8V
ILOAD=50mA
Load Step
1µS/Div
Efficiency vs Input voltage
100
IOUT =100mA
95
VOUT
200mV /Div
Efficiency(%)
90
ISW
500mV/Div
85
IOUT=600mA
80
75
IOUT=10mA
70
65
IOUT
500mA/Div
60
C
55
50
VIN=3.6V
20µS/Div
VOUT =1.8V
ILOAD =50mA to 600mA
2
5
6
Oscillator Frequency vs Supply Voltage
1.8
1.7
1.7
1.6
1.6
Frequency(MHz)
Frequency(MHz)
Oscillator Frequency vs Temperature
1.5
1.4
1.3
1.2
1.5
1.4
1.3
1.2
1.1
1.1
-15
+10
+35
+60
Temperature(o C)
Rev.C.01
4
Input Voltage(V)
1.8
1.0
-40
3
+85
+110
1.0
2
3
4
5
6
Supply Voltage(V)
13
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
VFB vs Temperature
RDS(ON) vs Input voltage
0.616
0.65
0.60
VIN=3.6V
0.612
0.55
RDS(ON) (mΩ)
0.608
VFB(V)
0.604
0.600
0.596
0.592
0.50
Main Switch
0.45
0.40
0.35
Synchronous
Switch
0.30
0.588
0.25
0.584
-40
-15
+10
+35
+60
+85
0.20
+110
1
2
o
RDS(ON) vs Temperature
0.65
90
VIN=2.7V
6
7
0.55
VIN=2.7V
80
VIN=4.2V
Efficiency(%)
RDS(O N) (mΩ)
5
Efficiency vs Load Current
VIN=3.6V
0.60
0.50
0.45
0.40
0.35
0.30
70
60
VIN=4.2V
50
40
30
V IN=3.6V
20
Main Switch
Synchronous Switch
0.25
0.20
-50
-25
0
+25
+50
+75
+100
10
0
1
+125
Temperature( oC)
VOUT=2.5V
10
100
1000
I OUT (mA)
Efficiency vs Load Current
Efficiency vs Load Current
100
100
90
90
V IN=2.7V
80
VIN=2.7V
80
V IN=4.2V
70
Efficiency(%)
Efficiency(%)
4
100
0.70
60
50
VIN =3.6V
40
70
VIN=4.2V
60
VIN=3.6V
50
40
30
20
30
VOUT=1.8V
VOUT=1.2V
20
10
1
14
3
Input Voltage(V)
Temperature( C)
10
I OUT (mA)
100
1000
1
10
100
1000
IOUT(mA)
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
Output Voltage vs Load Current
Efficiency vs Load Current
100
1.844
90
1.834
VIN=2.7V
Efficiency(%)
Efficiency(%)
80
70
V IN=3.6V
60
V IN =4.2V
50
1.824
1.814
1.804
1.794
40
1.784
30
20
V OUT =1.5V
1
10
100
1.774
1
1000
10
Current Limit vs VIN
2.10
1.8
2.00
1.90
Channel 1
1.80
Current Limit(A)
Current Limit(A)
1.6
1.5
1.4
1.3
1.2
Channel 2
1.1
1.0
0.8
1.50
1.40
1.30
1.10
2.8
3.1
3.4
3.7
4.0
4.3
4.6
4.9
5.2
V IN=3.3V
V OUT 1=1.2V
V OUT 2=1.2V
0.80
C
0.70
-40
5.5
-25
-10
+5
+20 +35 +50
+65 +80 +95 +110 +125
V IN (V)
Temperature(oC)
Current Limit vs Temperature
Current Limit vs Temperature
2.10
2.00
2.00
1.90
1.90
1.80
Current Limit(A)
Channel 1
1.70
1.60
1.50
1.40
1.30
Channel 2
1.20
1.10
V IN =3.6V
V OUT1=1.2V
V OUT2=1.2V
1.00
0.90
0.80
-25
-10
+5
+20 +35
+50 +65
o
Temperature( C)
Rev.C.01
Channel 2
1.20
0.90
1.80
Current Limit(A)
1.60
2.10
0.70
-40
Channel 1
1.70
1.00
V OUT 1=1.2V
V OUT 2=1.2V
0.9
0.7
2.5
1000
Current Limit vs Temperature
1.9
1.7
100
IOUT(mA)
IOUT(mA)
+80 +95 +110 +125
1.70
1.60
Channel 1
1.50
1.40
1.30
1.20
Channel 2
1.10
1.00
VIN=5.0V
VOUT 1=1.2V
VOUT 2=1.2V
0.90
0.80
0.70
-40
-25
-10
+5
+20
+35 +50 +65 +80
+95 +110 +125
Temperature( oC)
15
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
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
n Tape and Reel Dimension
DFN-10B (3mmx3mmx0.75mm)
P
PIN 1
W
AME
AME
Carrier Tape, Number of Components Per Reel and Reel Size
16
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
DFN-10B
(3x3x0.75mm)
12.0±0.1 mm
4.0±0.1 mm
3000pcs
330±1 mm
Rev. C.01
AME
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
AME5252
n Package Dimension
DFN-10B (3mmx3mmx0.75mm)
TOP VIEW
BOTTOM VIEW
e
D
L
E
E1
PIN 1 IDENTIFICATION
b
D1
A
G1
G
REAR VIEW
MILLIMETERS
MIN
MAXC
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
0.450
0.550
0.018
0.022
D1
2.300
2.500
0.091
0.098
E1
1.600
1.800
0.063
0.071
b
0.180
0.300
0.007
0.012
L
0.300
0.500
0.012
0.020
G
0.153
0.253
0.006
0.010
G1
0.000
0.050
0.000
0.002
SYMBOLS
Rev.C.01
INCHES
17
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. , September 2009
Document: 1045-DS5252-C.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