AMS AMS2566 Wide 3.6v to 25v input voltage range Datasheet

AMS2566
Features
General Description
„
„
Wide 3.6V to 25V Input Voltage Range
Output Adjustable from 0.8V to 24V
„
„
Maximum Duty Cycle 100%
Minimum Drop Out 0.6V
„
„
„
Fixed 360KHz Switching Frequency
5A Constant Output Current Capability
Internal Optimize Power MOSFET
High efficiency up to 85~90%
The AMS2566 is a 360 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 5A load with high
efficiency, low ripple and excellent line and
load regulation. Requiring a minimum
number of external components, the regulator
is simple to use and include internal
frequency
compensation
and
a
fixed-frequency oscillator.
„
„
„
„
Excellent line and load regulation
TTL shutdown capability
EN pin with hysteresis function
Built in thermal shutdown function
„ Built in current limit function
„ Built in output short protection function
„ Package in TO-263/TO252 and TO220
„
Applications
„
„
„
„
„
LCD Monitor and LCD TV
TO220 can supply 5A continues
TO263 can supply 5A , TO252 can supply 4A
ADSL Modem
Telecom / Networking Equipment
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An enable
function, an over current protection function
is built inside. When short protection function
happens, the operation frequency will be
reduced from 360KHz to 70KHz. An internal
compensation block is built in to minimize
external component count.
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AMS2566
Pin Configurations for TO263/TO220/TO252 :
Important Note : Pin3 SW is shorted to Tab (heat -sink is not ground)
Table 1 Pin Description
Pin Number
Pin Name
1
GND
2
FB
3
SW
4
EN
5
VIN
Description
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor
ground path to prevent switching current spikes from inducing
voltage noise into AMS2566.
Feedback Pin (FB). Through an external resistor divider
network, FB senses the output voltage and regulates it. The
feedback threshold voltage is 0.8V.
Power Switch Output Pin (SW). SW is the switch node that
supplies power to the output.
Enable Pin. Drive EN pin high to turn on the device, drive it
low to turn it off. Floating is default high.
Supply Voltage Input AMS2566 operates from a 3.6V to
25V DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
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AMS2566
Function Block
Figure3. Function Block Diagram of AMS2566
Typical Application Circuit
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AMS2566
Ordering Information
Package
Temperature
Range
FACT
Lead Free
TO263-5/TO252-5
Part Number
Lead Free
AMS2566-XX
AMS2566L-XX
voltage
XX
TO220-5 (two lines, two pins back three front)
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
Absolute Maximum Ratings(Note1)
Parameter
Symbol
Vin
VFB
VEN
VOutput
PD
Value
-0.3 to 27
-0.3 to Vin
-0.3 to Vin
-0.3 to Vin
Internally limited
Unit
V
V
V
V
mW
Input Voltage
Feedback Pin Voltage
EN Pin Voltage
Output Switch Pin Voltage
Power Dissipation
Thermal Resistance (TO263)
(Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
RJA
50
ºC/W
TJ
TSTG
TLEAD
-40 to 125
-65 to 150
260
2000
ºC
ºC
ºC
V
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
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AMS2566
Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
0.776
0.8
0.824
V
-
89
-
%
System parameters test circuit figure4
Feedback
Voltage
VFB
Efficiency
ŋ
Vin = 5V to 25V, Vout=5V
Iload=0.5A to 5A
Vin=12V ,Vout=5V
Iout=4.0A
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta =
25℃; the others floating unless otherwise specified.
Parameters
Symbol
Test Condition
Min.
Typ.
3.6
Max.
Unit
25
V
Input operation voltage
Vin
Shutdown Supply Current
ISTBY
VEN=0V
60
200
uA
Quiescent Supply Current
Iq
VEN =2V,
VFB =Vin
3
5
mA
360
402
Oscillator Frequency
Fosc
Switch Current Limit
IL
VFB =0
8
A
VEN
High (Regulator ON)
Low (Regulator OFF)
1.4
0.8
V
IH
VEN =2V (ON)
1
15
uA
IL
VEN =0V (OFF)
1
15
uA
DMAX
VFB=0V
100
EN Pin Threshold
EN Pin Input Leakage
Current
Max. Duty Cycle
298
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Khz
%
AMS2566
Test Circuit and Layout guidelines
Figure5. Standard Test Circuits and Layout Guides
Select R1 to be approximately 2K, use a 1% resistor for best stability.
C1 and CFF are optional; in order to increase stability and reduce the input power line noise, CIN
and C1 must be placed near to PIN1 and PIN3;
For output voltages greater than approximately 10V, an additional capacitor CFF is required. The
compensation capacitor is typically between 100 pf and 33 nf, and is wired in parallel with the
output voltage setting resistor, R2. It provides additional stability for high output voltage, low
input-output voltages, and/or very low ESR output capacitors, such as solid tantalum capacitors.
CFF=1/(31*1000*R2); This capacitor type can be ceramic, plastic, silver mica, etc. (Because of
the unstable characteristics of ceramic capacitors made with Z5U material, they are not
recommended.)
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AMS2566
Schottky Diode Selection Table
Current
1A
3A
Surface Through VR (The same as system maximum input voltage)
Mount Hole
20V
30V
40V
50V
1N5817
1N5818
1N5819
√
√
1N5820
1N5821
1N5822
√
MBR320
MBR330
MBR340 MBR350
MBR360
SK32
SK33
SK34
SK36
30WQ03
30WQ04 30WQ05
31DQ03
31DQ04
31DQ05
SR305
SR306
√
√
√
5A
√
60V
SK35
√
SR302
SR303
SR304
√
1N5823
1N5824
1N5825
√
SR502
SR503
SR504
SR505
SR506
√
SB520
SB530
SB540
SB550
SB560
50WQ03
50WQ04 50WQ05
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AMS2566
Typical System Application for 24V ~ 12V/3A Version
Figure6. AMS2566 System Parameters Test Circuit (24V ~ 12V/3A)
Typical System Application for 24V ~ 5V/5A
Figure7. AMS2566 System Parameters Test Circuit (24V ~ 5V/5A)
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AMS2566
Package information:
(1) TO263-5L
(2)
TO220-5 is 3pins front and 2 back same as BM2596-L
so , it will not be described here .
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AMS2566
(3) Package Information
TO252-5L
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