AIC AIC2510PB5 3a step-down pwm converter Datasheet

AIC2510
3A STEP-DOWN PWM CONVERTER
FEATURES
GENERAL DESCRIPTION
Operating Input Voltage From 4.5V to 30V
The AIC2510 series are step-down monolithic
3.3V, 5V, 12V and Adjustable Output Version
PWM converters for delivering 3A at fixed
Adjustable Version Output Voltage Range,
1.2V to 30V ± 4% max Over Line and Load
Regulation
voltages of 3.3V, 5.0V, 12V and using an
external divider to adjust output voltage from
1.2V to 30V with excellent line and load
Available in TO-263-5, TO-220-5 and TO-220B
Package
regulation.
Requires Only 4 External Components
Switching frequency up to 150KHz is achievable
150KHz Fixed Constant Frequency
thus allowing smaller-sized filter components.
Low Power Standby Mode, IQ Typically 80µA
Internal current limit and thermal shutdown
TTL Shutdown Capability
Current Limit
Protection
and
circuits provide protection from overloads. The
Thermal
internal
Shutdown
precise
reference
combined
with
voltage feedback loop provides optimum output
voltage
3A Guaranteed Output Load Current
accuracy
and
fast
load
transient
response.
APPLICATIONS
Fixed Voltage power supply for LCD Monitor
and LCD TV
On-Card Switching regulators
Simple High Efficiency Step-down regulator
TYPICAL APPLICATION CIRCUIT
AIC2510
VIN
1
OUT
IN
VOUT
2
L1
+
C1
5
ON/OFF
D1
4
+
C2
CF
R1
FB
GND
3
C1: electrolyte capacitor 470uF
C2: electrolyte capacitor 220uF
CF:refer to table1
D1: SK54
L1:33uH
Analog Integrations Corporation
R2
R1 short, R2 and CF open for fixed version
3A1, No.1 Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-2510G-01 092408
1
AIC2510
ORDERING INFORMATION
AIC2510- XXXXXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGE TYPE
M5 : TO-263-5
T5 : TO-220-5
B5 : TO-220B
P: Lead Free Commercial
G: Green Package
OUTPUT VOLTAGE
DEFAULT : Adj
33 : 3.3V
50 : 5.0V
12 : 12.0V
ORDER NUMBER
AIC 2510PM5
AIC 2510-33PM5
AIC 2510-50PM5
AIC 2510-12PM5
AIC 2510PT5
AIC 2510-33PT5
AIC 2510-50PT5
AIC 2510-12PT5
AIC 2510PB5
AIC 2510-33PB5
AIC 2510-50PB5
AIC 2510-12PB5
PIN CONFIGURATION
TO-263-5
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. ON/OFF
TO-220-5
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. ON/OFF
TO-220B
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. ON/OFF
12 3 4 5
1 2 3 4 5
1 2 3 4 5
Example: AIC2510-50PM5TR
5.0V Output Version, in Lead Free TO-263- 5 Package
& Taping & Reel Packing Type
AIC2510-33PB5TR
3.3V Output Version, in Lead Free TO-220B Package
& Taping & Reel Packing Type
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
30V
FB, ON/OFF Pin Input Voltage
-0.3V to 30V
Operating Temperature Range
-40°C ~ 85°C
Storage Temperature Range
-65°C ~ 150°C
Junction Temperature
125°C
Lead Temperature (Soldering 10sec.)
260°C
3°C/W
Thermal Resistance Junction to Case
TO-263-5, TO-220-5, TO-220B
Thermal Resistance Junction to Ambient
TO-263-5
60°C/W
(Assume no ambient airflow, no heatsink)
TO-220-5, TO-220B
50°C/W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2
AIC2510
ELECTRICAL CHARACTERISTICS
(TA=25°°C, VIN=12V for the 3.3V, 5V and
Adjustable version and VIN=24V for the 12V version.) (Note1)
PARAMETER
TEST CONDITIONS
MAX.
UNIT
4.5
30
V
AIC2510-33 (VIN > 4.75V)
3.168
3.432
V
AIC2510-50 (VIN > 7.0V)
4.800
5.200
V
AIC2510-12 (VIN > 15V)
11.52
12.48
V
1.193
1.267
V
1.4
V
4
%
Input Voltage
Fixed Output Voltage
FB Reference Voltage
MIN.
Saturation Voltage
TYP.
1.2
Output Voltage Regulation
Quiescent Current
Internal switch off
5
10
mA
Shutdown Quiescent Current
ON/OFF= 5V (OFF)
80
200
µA
FB bias current
VFB=1.3
10
50
nA
Output leakage current
Vout=-0.9
2
30
mA
Logic Input High
(Regulator OFF)
Logic Input Low
(Regulator ON)
2.0
Oscillator Frequency
130
Output Current Limit
3.6
Maximum Duty Cycle
100
Minimum Duty Cycle
Efficiency
Vo=5V, Io=3A
V
150
0.6
V
180
KHz
5.5
A
%
0
%
80
%
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
3
AIC2510
TYPICAL PERFORMANCE CHARACTERISTICS
85
90
80
85
VOUT=3.3V version
75
75
65
70
Efficiency (%)
Efficiency (%)
60
55
50
45
40
35
30
25
VOUT=5.0V version
80
70
Vin=5V
Vin=12V
65
60
55
50
45
40
Vin=18V
Vin=24V
20
Vin=12V
Vin=18V
35
Vin=24V
30
Vin=30V
25
10
100
1000
10
100
Load current (mA)
1000
Load current (mA)
Fig.1 3.3V version efficiency
Fig.2 5V version efficiency
90
95
85
90
VOUT=12.0V version
80
Vout=12V
75
o
Case Tempearature ( C)
85
Efficiency (%)
80
75
70
65
Vin=18V
60
Vin=24V
55
Vin=30V
70
Vout=5.0V
65
60
Vout=3.3V
55
50
45
40
35
50
IOUT=3A
TO-263-5
30
25
45
10
100
5
1000
10
15
190
6.4
180
6.0
170
5.6
160
150
140
130
4.8
4.4
4.0
3.6
110
3.2
-20
0
20
o
40
30
5.2
120
-40
25
Fig.4 Case temperature vs. input voltage
6.8
Current Limit (A)
Switching Frequency (kHz)
Fig.3 12V version efficiency
200
100
-60
20
Input Voltage (V)
Load current (mA)
60
80
TJ( C)
Fig.5 Switching frequency vs. Temperature
100
2.8
-60
-40
-20
0
20
40
60
80
100
Current Limit vs. Temperature
Fig.6 Current Limit vs. Temperature
4
AIC2510
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
1.6
1.6
1.5
1.5
1.4
1.4
Saturation Voltage (volt)
Dropout Voltage (vlot)
1.3
1.2
3A
1.1
1.0
0.9
1A
0.8
0.7
1.3
o
-40 C
1.2
o
25 C
1.1
o
100 C
1.0
0.9
0.8
0.7
0.6
0.6
0.5
-60
-40
-20
0
20
40
60
80
100
120
140
0.0
0.5
1.0
1.5
o
2.0
2.5
3.0
3.5
4.0
4.5
Switch Current (A)
TJ ( C)
Fig.7 Dropout voltage vs. Temperature
Fig.8 Switching saturation voltage vs. switch current
5.0
2.5
2.0
Minimum Supply Voltage (volt)
ON/OFF threshold voltage (volt)
4.8
OFF
1.5
1.0
ON
0.5
4.6
VFB=1.23V
4.4
ILOAD=120mA
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
0.0
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
o
o
TJ ( C)
TJ ( C)
Fig.9 ON/OFF threshold voltage vs. Temperature
Fig.10 Minimum Operating supply voltage vs. Temperature
(ADJ only)
5.0
VIN = 30V
o
o
-40 C < TJ < 125 C
4.5
4.0
3A
IOUT
Current (uA)
3.5
0.1A
3.0
2.5
2.0
1.5
VOUT
1.0
100mV/div
VIN=12V
VOUT=5V
0.5
0.0
0
5
10
15
20
25
ON/OFF Pin Voltage (Volt)
Fig.11 ON / OFF Pin Current (sinking) vs. Temperature
Fig.12 Load transient response
5
AIC2510
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig.13 FB pin ripple(CCM)
Fig.14 FB pin ripple(DCM)
BLOCK DIAGRAM
SHDN
IN
1.23 V
Reference
2.6V Regulator
ON / OFF
FB
Current
Limit
COMP.
AMP.
COMP.
Compensation
Latch
Driver
Circuit
OUT
150KHz
Thermal
OSC
Shutdown
GND
6
AIC2510
PIN DESCRIPTIONS
PIN 1: IN
PIN 2: OUT
PIN 3: GND
Supply voltage input for the IC
switching regulator. A suitable input
bypass capacitor must be present
at this pin to minimize voltage
transients and to supply the
switching currents needed by the
regulator.
Internal switch. The voltage at this
pin switches between (VIN-VSAT)
and approximately -0.5V, with a
duty cycle
of
approximately
VOUT/VIN.
Ground requires a short, low noise
connection to ensure good load
regulation.
PIN 4: FB
Feedback input for fixed-output or
adjustable-output version. Connect
directly to output for fixed operation
version or to a resistor divider for
adjustable operation versions.
PIN 5: ON / OFF Allows the switching regulator
circuit to be shutdown using logic
level signals thus dropping the total
input
supply
current
to
approximately 80µA. Drive it high
to disable the reference, control
circuitry and internal switches.
Drive low or connect to GND for
normal operation.
APPLICATION INFORMATION
Thermal considerations
The AIC2510 is available with TO-220-5, TO220B
and TO-263-5 packages. The TO-220-5 and
TO220B packages need a heat sink in most
conditions. The TO-263-5 package is designed to
be soldered to the copper on a printed circuit
board. The printed circuit board is the heat sink for
TO-263-5 package and other heat components,
such as inductors and diodes. The size of the heat
sink depends on the power loss of AIC2510 and
such as sink size, heat produced from heat
components, and etc., may be different from those
in Fig.8 depending on the conditions of the
application. According to the equation 1, as the
power loss or ambient temperature is rising the
heat sink size must be increased to decrease the
thermal resistance (
Rθ jA ) so that the junction
temperature does not over 125۫ C. An appropriate
increase of heat sink size may result in a normalranged junction temperature.
the ambient temperature. The power loss of
AIC2510 is determined by input voltage, output
voltage and load current. The Fig.4 represents the
PD =
T j − TA
Rθ jA
curve of the AIC2510 case temperature in different
conditions.
As junction temperature rises to its temperature
protect point, the AIC2510 will stop working.
The curve shows the AIC2510 temperature rises
Output voltage drops to zero until the junction
above ambient temperature for a 3A load with
temperature decreases to a normal range.
different input and output voltage. The values of
the temperature rise, which are affected by factors
7
AIC2510
APPLICATION INFORMATION (Continued)
Components Selection
Example
Assume the input voltage is 12V, output voltage is
Inductor
The inductor selection depends on the operating
5V and maximum load current is 3A. The output
ripple must be smaller than 2% of output voltage
frequency of the AIC2510. The ripple current ∆IL
interrelates with inductor value. A lower inductor
value gets a higher ripple current. Besides, a
higher VIN or VOUT can also get the same result.
Inductor selection:
L=
The inductor value can be calculated as the
=
following formula.
L=
1
(f )(∆IL )

V
VOUT 1 − OUT
VIN




 V
1
VOUT 1 − OUT
( f )(∆I L )
VIN




1
5

× 5 × 1 −  = 32.4uH
150k × 0.6
 12 
Here, the delta IL is 0.6A. So we choose 33uH
inductor.
Users can define the acceptable ∆IL to gain a
suitable inductor value.
Output capacitor selection:
Diode
The diode current rating must be higher than 1.3

1
∆VOUT = ∆I L  ESR +
8 fC OUT

times maximum load current. Also, if the power
supply needs to resist a continuous output short,
the diode should have a current ration equal to the
maximum current limit of the AIC2510. The
reverse voltage rating of the diode should be

 < 100mV

We choice the capacitor value: ESR=0.12,
capacitance=220uF

1 
 = 74mV < 100mV
⇒ ∆VOUT = ∆I L  ESR +
8
fC
OUT 

higher than 1.25 times input voltage and the diode
must be fast. The reverse recovery time of the
Diode selection:
diode is short.
The full load is 3A and delta IL is 0.6A, so the diode
current rating must be higher than 3.6A.
Capacitor
The selection of output capacitor depends on the
CF Capacitor for adj version
suitable ripple voltage. Lower ripple voltage
As using the AIC2510 adj version, the CF
corresponds to lower ESR (Equivalent Series
capacitor is required to provide additional stability.
Resistor) of output capacitor. Typically, once the
In different condition, the CF capacitor must be
ESR is satisfied with the ripple voltage, the value
changed to make the circuit stable.
of capacitor is adequate for filtering. The formula
of ripple voltage is as below:

1
∆VOUT = ∆IL  ESR +
8
fC
OUT

Output
Input
Voltage (V) Voltage (V)




The typical input capacitor is 470uF. But as the
temperature decreases, the input capacitor needs
to increase to stabilize the circuit.
R1
(
Ω)
CF
(
Ω)
R2
(pF)
1.8
7
36k
82k
1000
4
12
180k
82k
360
6
12
180k
47k
360
8
15
180k
33k
360
10
18
150k
22k
470
15
25
110k
10k
560
Table 1
8
AIC2510
PHYSICAL DIMENSIONS (unit: mm)
TO-263-5
A
c2
E
S
Y
M
B
O
L
1L
D
H
A
TO-263-5L
MILLIMETERS
MIN.
MAX.
A
4.06
4.83
A1
0.00
0.25
b
0.51
0.99
c
0.38
0.74
c2
1.14
1.65
D
8.38
9.65
E
9.65
e
A
e
SEE VIEW B
b
WITH PLATING
BASE METAL
SECTION A-A
c
10.67
1.70 BSC
H
14.61
15.88
L
1.78
2.79
L1
--
q
1.68
0.25 BSC
L3
0°
8°
θ
GAUGE PLANE
L
3
L
VIEW B
SEATING PLANE
1
A
Note: 1. Refer to JEDEC TO-263BA.
2. Dimension "E" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "D" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
9
AIC2510
PHYSICAL DIMENSIONS(Continued) (unit: mm)
TO-220B
A
E
E1
d
E1
S
Y
M
B
O
L
F
φ
D
TO-220B
MILLIMETERS
MIN.
MAX.
A
4.318
4.826
A1
4.250
4.550
A2
8.250
8.550
b
0.690
0.940
C
0.304
0.530
D
1
D
D1
1L
e
b
e1
A1
9.300
2.743(REF)
d
E
L
3.556(REF)
8.480
9.906
10.44
E1
4.953
5.220
φ
3.708
3.962
e
1.524
2.032
e1
6.604
7.112
F
1.143
1.397
L
9.880
10.64
L1
9.090
9.850
C
A2
Note : Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
10
AIC2510
TO-220-5L
E
E1
d
A
E1
S
Y
M
B
O
L
F
φ
D
1
D
TO-220-5L
MILLIMETERS
MIN.
MAX.
A
4.064
4.826
A1
2.032
2.921
b
0.635
1.016
C
0.304
0.460
D
3.429
3.683
D1
7.620
9.398
d
2.620
2.870
E
9.779
10.668
E1
4.953
5.220
φ
3.708
3.962
e
1.524
2.032
F
1.143
1.397
L
13.589
14.351
L
e
b
C
A1
Note : Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any
circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties
that may result from its use. We reserve the right to change the circuitry and specifications without notice.
Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices
or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and
whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably
expected to result in a significant injury to the user.
11
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