AME, Inc.
AME5110
n
General Description
The AME5110 family of Fixed Frequency,High Efficiency,
Synchronous Buck, DC-DC Converters, apply the latest
innovations in Current-Mode Technology. Available in SOT-
25 package, these devices are typically twice as efficient
as standard LDO’ s, making them well suited for most
portable applications.
The AME5110 is simple to use. As with standard
LDO’ s,(1) Input, and (1) Output capacitor are required.
The only other element is a small, low cost, 2.2µH induc-
tor. The AME5110 is availabe with fixed output voltages
of 1.5V and 1.8V, or adjustable at 600mA. Using a propri-
etary
“
Extreme Green” Technology, battery life is maxi-
mized with Frequency Foldback at light Load, and 100%
duty when Vin approaches Vout.
600mA / 1.2MHz PWM
Buck DC-DC Converter
n
Typical Application
Fixed Voltage Version
V
IN
2.2µH
V
IN
SW
V
OUT
C
IN
4.7µF
CER
AME5110
EN
GND
V
OUT
C
OUT
10µF
CER
n
Features
l
High Efficiency
“
Extreme Green”
l
2.5V to 5.5V Input
l
Short Circuit Protection
l
Over-Temperature Shutdown
l
Under-Volatge Lockout
l
Superb Transient Response
l
All AME’ s Lead Free Products Meet RoHS
Standards
C
IN
4.7µF
CER
V
IN
V
IN
SW
22pF
2.2µH
V
OUT
Adjustable Voltage Version
AME5110
EN
GND
V
FB
R1
C
OUT
10µF
CER
R2
n
Applications
l
Cellular Phones
l
Digital Cameras
l
Portable Electronics
l
USB Devices
l
MP3 Players
l
LDO Replacement
V
OUT
=V
FB
(R1+R2)/R2
Rev. A.03
1
AME, Inc.
AME5110
n
Function Diagram
600mA / 1.2MHz PWM
Buck DC-DC Converter
4
AMP
OUT-SENSE
5
ERROR
AMP
SLOPE
COMP
OSC
0.6V
REF
SYNC
SWITCH
COMP
R
LATCH
S
Q
3
V
IN
SW
AMP
1
RUN
Light-Load /
Short-Circuit
Frequency
Foldback
COMP
2
GND
2
Rev. A.03
AME, Inc.
AME5110
n
Pin Configuration
SOT-25
Top View
5
4
600mA / 1.2MHz PWM
Buck DC-DC Converter
SOT-25
Top View
AME5110AEEVxxx
1. EN
2. GND
5
4
AME5110BEEVADJ
1. EN
2. GND
AME5110
3. SW
4. V
IN
5. V
OUT
AME5110
3. SW
4. V
IN
5. V
FB
1
2
3
1
2
3
* Die Attach:
Conductive Epoxy
* Die Attach:
Conductive Epoxy
n
Pin Description
Pin Number
Pin Name
AME5110AEEVxxx AME5110BEEVADJ
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.
Ground Pin
Switch Node Connection to Inductor.
This pin connects to the drains of the internal main and
synchronous power MOSFET switches.
Main Supply Pin.
Must be closely decoupled to GND, Pin2, with a 2.2µF or
greater ceramic capactior.
Feedback Pin.
Receives the feedback voltage from an external resistive
divider across the output.
Output Voltage for fixed version
Pin Description
1
1
EN
2
2
GND
3
3
SW
4
4
V
IN
N/A
5
V
FB
V
OUT
5
N/A
Rev. A.03
3
AME, Inc.
AME5110
n
Ordering Information
AME5110 x x x x xxx x
600mA / 1.2MHz PWM
Buck DC-DC Converter
Special Feature
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Number
of
Pins
V: 5
Pin
Configuration
A
(SOT-25)
Operating Ambient
Temperature Range
E: -40
O
C to 85
O
C
Package Type
Output Voltage
Special Feature
1. EN
2. GND
3. SW
4. V
IN
5. V
OUT
1. EN
2. GND
3. SW
4. V
IN
5. V
FB
E: SOT-2X
150: 1.5V
180: 1.8V
ADJ: Adjustable
Y: Lead free
& Low profile
Z: Lead free
B
(SOT-25)
n
Ordering Information
Part Number
AME5110AEEV150Y
AME5110AEEV150Z
AME5110AEEV180Y
AME5110AEEV180Z
AME5110BEEVADJY
AME5110BEEVADJZ
Marking*
BARww
BARww
BASww
BASww
BATww
BATww
Output Voltage
1.5V
1.5V
1.8V
1.8V
ADJ
ADJ
Package
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
Operating Ambient
Temperature Range
-40
O
C to 85
O
C
-40
O
C to 85
O
C
-40
O
C to 85
O
C
-40
O
C to 85
O
C
-40
O
C to 85
O
C
-40
O
C to 85
O
C
Note: ww represents the date code and pls refer to Date Code Rule page on Package Dimension.
* A line on top of the first letter represents lead free plating such as BARww.
Please consult AME sales office or authorized Rep./Distributor for the availability of package type.
4
Rev. A.03
AME, Inc.
AME5110
n
Absolute Maximum Ratings
Parameter
Input Supply Voltage
EN, V
FB
Voltages
SW Voltage
ESD Classification
600mA / 1.2MHz PWM
Buck DC-DC Converter
Symbol
V
IN
V
EN
,V
FB
V
SW
Maximum
6
V
IN
V
IN
+0.3
C*
Unit
V
V
V
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
* HBM C: 4000V+
n
Recommended Operating Conditions
Parameter
Ambient Temperature Range
Junction Temperature Range
Symbol
T
A
T
J
Rating
-40 to +85
-40 to +125
Unit
o
C
C
o
n
Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Maximum Junction Temperature
Solder Iron (10 Sec)**
SOT-25
Conductive Epoxy
Package
Die Attach
Symbol
θ
JC
θ
JA
P
D
Maximum
81
Unit
o
C/W
260
o
C/W
mW
o
400
150
350
C
C
o
* Measure
θ
JC
on center of molding compound if IC has no tab.
** MIL-STD-202G210F
Rev. A.03
5
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