AMC2596
w w w. a d d m t e k . c o m
150 KHz, 3A S
TEP
D
OWN
V
OLTAGE
R
EGULATOR
FEATURES
150 KHz fixed frequency internal oscillator
Guaranteed 3A output load current
Input voltage range up to 40V
3.3V, 5V and adjustable output versions
Adjustable version output voltage range,
1.2V to 37V
±4% max over line and load conditions
Requires only 4 external components
Excellent line and load regulation
specifications
Available in TO-220 and TO-263 packages
TTL shutdown capability
Low power standby mode, I
Q
typically 80
µA
High efficiency
Thermal shutdown and current limit
protection
DESCRIPTION
The AMC2596 series are highly integrated step down
voltage regulator capable of driving a 3A load with extremely
regulated output voltages over line & load regulation. These
devices are available in fixed output voltages of 3.3V. 5V and
an adjustable output versions.
These regulators require a minimum number of external
components and are simpler to use by an internal frequency
compensation and a fixed – frequency oscillator.
By operating a switching frequency of 150KHz, the
AMC2596 series require smaller sized filter components. This
feature makes the application design more cost effective than
lower frequency switch regulators. A standard 5-lead TO-220
package with several different lead bend options, and a 5-lead
TO-263 surface mount package is available
The AMC2596 series feature a guaranteed ±4% tolerance
of output voltage over input to output load conditions.
APPLICATIONS
Portable DVD players
On-card switching regulators
Simple high-efficiency step-down (buck)
regulator
VOLTAGE OPTIONS
AMC2596-3.3
AMC2596-5.0
AMC2596-ADJ
3.3V Fixed
5.0V Fixed
Adjustable Output
5-Pin Plastic TO-220B
(Top View)
PACKAGE PIN OUT
5. Enable
4. FB
3. GND
2. V
OUT
1. V
IN
5. Enable
4. FB
3. GND
2. V
OUT
1. V
IN
5-Pin Plastic TO-263
Surface Mount
(Top View)
5. Enable
4. FB
3. GND
2. V
OUT
1. V
IN
5-Pin Plastic TO-220B
(Side View)
5-Pin Plastic TO-220
(Top View)
ORDER INFORMATION
T
A
(
°
O
C )
-40 to 125°C
Note：
Plastic TO-220
5-pin
AMC2596-ADJPF
AMC2596-X.XPF
P
Plastic TO-220B
5-pin
AMC2596-ADJPBF
AMC2596-X.XPBF
PB
Plastic TO-263
5-pin
AMC2596-ADJDDF
AMC2596-X.XDDF
DD
1.All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC2596-X.XDDFT).
2.The letter “F” is marked for Lead Free process.
Copyright
©
2005 ADD Microtech Corp.
1
AMC2596_A (LF) May 2005
AMC2596
TYPICAL APPLICATION
7V – 40V
DC INPUT
1
FB
V
IN
4
AMC2596-X.X
V
OUT
2
L1
33 uH
IN5824
C
OUT
220uF
OUTPUT
ENABLE
5
GND
C
IN
680uF
3
Fixed Output Voltage Version
FB
4
7V – 40V
DC INPUT
1
V
IN
AMC2596-ADJ
V
OUT
2
L1
33uH
IN5824
C
OUT
220uF
OUTPUT
R2
R1
ENABLE
5
GND
3
C
IN
680uF
Adjustable Output Voltage Version
Where V
REF
= 1.23V, R1 between 1K and 5K
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground (Steady State)
Power dissipation
Storage Temperature Range
ESD Susceptibility --- Human Body Model
(Note 2)
Surface Mount Package--- Vapor Phase (60 sec.)
--- Infrared (10 sec.)
Through Hole Package (Soldering, 10 sec.)
Maximum Junction Temperature, Tj
(Note 1)
45V
-0.3≦V≦+25V
-0.3≦V≦+25V
-1V
Internally limited
-65°C to +150°C
2kV
+215°C
+245°C
+260°C
+150°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
Copyright
©
2005 ADD Microtech Corp.
2
AMC2596_A (LF) May 2005
AMC2596
THERMAL DATA
P,PB, DD PACKAGE:
Thermal Resistance-Junction to Tab,
θ
JT
Thermal Resistance-Junction to Ambient,
θ
JA
3.0°C /W
45°C /W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
× θ
JA
). The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
BLOCK DIAGRAM
V
IN
1
FB
4
R2*
150KHz
Oscillator
Thermal Shutdown
&
Current Limit
Regulator
With
Enable
5
ENABLE
Comparator
R1*
GND
3
Error
Amplifier
1.23V
Reference
Driver
2
Reset
V
OUT
V
OUT
= 3.3V
: R2/R1 = 1.7
V
OUT
= 5.0V
: R2/R1 = 3.1
V
OUT
= Adjustable : R2 = 0, R1 = Open
Copyright
©
2005 ADD Microtech Corp.
3
AMC2596_A (LF) May 2005
AMC2596
RECOMMENDED OPERATING CONDITIONS
Temperature Range
Supply Voltage
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply V
IN
= 12V, I
LOAD
= 0.5A and the operating ambient temperatures T
J
= 25°C.
-40°C≦T
J
≦+125°C
4.5V to 40V
Parameter
Output Voltage
Efficiency
Output Voltage
Efficiency
Feedback Voltage
Efficiency
AMC2596-3.3
Symbol
V
OUT
η
V
OUT
η
V
FB
η
Ib
f
OSC
V
SAT
DC
I
LIMIT
I
LEAK
I
Q
I
STBY
V
IH
V
IL
I
H
I
L
Conditions
4.75V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
V
IN
= 12V, I
LOAD
= 3A
(Note 3)
7V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
V
IN
= 12V, I
LOAD
= 3A
(Note 3)
4.5V
≤
V
IN
≤
40V, 0.2A
≤
I
LOAD
≤
3A
V
IN
= 12V, I
LOAD
= 3A
(Note 3)
Adjustable Version Only, V
FB
=1.3V
(Note 4)
Min
3.168
Typ
3.3
73
Max Units
3.342
V
%
5.200
V
%
V
%
50
173
1.4
nA
KHz
V
%
6.9
50
30
10
200
0.6
A
µA
mA
mA
µA
V
AMC2596-5.0
4.800
5.0
80
AMC2596-ADJ
1.193 1.230 1.267
73
10
127
150
1.16
100
0
4.5
2
5
80
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Current Limit
Output Leakage Current
Quiescent Current
Standby Current
ENABLE Pin Threshold Voltage
I
OUT
= 3A
(Note 5,6)
(Note 8,9)
Peak Current
(Note 5,6)
Output = 0V
(Note 5,7)
Output = -1V
(Note 8)
(Note 9)
3.6
ENABLE pin=5V (OFF)
(Note 8)
Low(Regulator ON)
High(Regulator OFF)
V
LOGIC
=2.5V(Regulator OFF)
V
LOGIC
=0.5V(Regulator OFF)
2.0
ENABLE Pin Input Current
5
0.02
15
5
µA
µA
Note 1：Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which
the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions,
see the Electrical Characteristics.
Note 2：The human body model is a 100 pF capacitor discharged through a 1.5K resister into each pin.
Note 3：External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching
regulator system performance. When the AMC2596 is used as shown in the Figure 1 test circuit, system performance will be as shown in
system parameters section of Electrical Characteristics.
Note 4：The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of
current over-load.
Note 5：No diode, inductor or capacitor connected to output pin.
Note 6：Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 7：Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15Vfor the 12V version, to force the
output transistor switch OFF.
Note 8：V
IN
＝40V
Copyright
©
2005 ADD Microtech Corp.
4
AMC2596_A (LF) May 2005
AMC2596
CHARACTERIZATION CURVES
Typical application circuit, T
J
=25°C, unless otherwise specified
.
Line Regulation
Line Regulation
5.04
5.035
5.03
Output
Output Voltage v.s
Temperature
Voltage vs.
Temperature
5.05
5.04
5.03
5.02
5.01
5
4.99
4.98
4.97
4.96
4.95
4.94
4.93
4.92
4.91
4.9
-40
-20
0
20
40
V
O U T
(V )
5.025
5.02
5.015
5.01
5.005
5
-40
-20
0
20
40
60
80
O u t p u t V o lt a g e (V )
V
IN
= 12V, V
OUT
= 5V
I
LOAD
= 0.5A
V
IN
(V)
60
80
100
120
Temp (oC)
Saturation Voltage
v.s Load Current
Saturation Voltage
vs. Load Current
3
20
18
Quiescent Current vs. Input Voltage
Quiescent Current v.s Input Voltage
Q uies c ent Current (uA )
V
OUT
= 5V
I
LOAD
= 3A
2.5
16
14
12
10
8
6
4
2
0
7
10
15
20
25
30
35
I
L O A D
(A )
2
1.5
1
0.5
0
0
0.5
1
1.5
2
T
J
= 125°C
T
J
= 25°C
I
LOAD
= 200mA
2.5
3
40
Saturation Voltage (V)
Input Voltage (V)
Standby Current
Temperature
Standby Current v.s
vs. Temperature
100
90
2.4
Dropout Voltage
v.s Temperature
Dropout Voltage
vs. Temperature
2.2
2
S t a n d b y C u rre n t (u A )
80
70
60
50
40
30
20
10
0
-40
-20
0
20
40
V
IN
= 40V
D r o p o u t V o lt a g e (V )
I
LOAD
= 3A
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
V
IN
= 12V
I
LOAD
= 0.5A
60
80
100
120
-40
-20
0
20
40
60
o
80
100
120
Temp (oC)
Temp ( C)
Copyright
©
2005 ADD Microtech Corp.
5
AMC2596_A (LF) May 2005
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