CHAMP CM2593-3.3V 2a step down voltage regulator Datasheet

CM2593/P
2A Step Down VOLTAGE REGULATOR
GENERAL DESCRIPTION
FEATURES
The CM2593/P is a monolithic integrated circuit that
◆
3.3V, 5V and adjustable output versions
provide all the active functions for a step-down
◆
Adjustable version output voltage range, 1.23V to 37V +4%
max over line and load condition
switching regulator, capable of driving a 2A load
without additional transistor component. Requiring a
minimum number of external component, the board
space can be saved easily. The external shutdown
◆
SOP-8L packages
◆
Voltage mode non-synchronous PWM control
◆
Thermal-shutdown and current-limit protection
◆
ON/OFF shutdown control input
function can be controlled by TTL logic level and
◆
Input voltage range up to 40V
then
internal
◆
Output load current: 2A
compensation makes feedback control have good
◆
150 kHz fixed frequency internal oscillator
line and load regulation without external design.
◆
Low power standby mode
Regarding protected function, thermal shutdown is
◆
Built-in switching transistor on chip
come
into
standby
mode. The
to prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. The CM2593/P operates at a
switching frequency of 150Khz thus allowing smaller
sized filter components than what would be needed
with lower frequency switching regulators. Other
features include a guaranteed +4% tolerance on
output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, and an adjustable type. The packages are
APPLICATIONS
‹
Simple High-efficiency step-down(buck) regulator
‹
Efficient pre-regulator for linear regulators
‹
On-card switching regulators
‹
Battery / Car Charger
‹
Positive to negative converter
‹
Digital Still and Video Cameras
available in a standard 8-lead SOP8.
TYPICAL APPLICATIONS
Figure 1. Basic Application Circuit with CM2593/P fixed version
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 1
CM2593/P
2A Step Down VOLTAGE REGULATOR
PIN CONFIGURATION
Sop08
Top View(CM2593)
Sop08
Top View(CM2593P)
BLOCK DIAGRAM
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 2
CM2593/P
2A Step Down VOLTAGE REGULATOR
PIN DESCRIPTION
Pin No.
Symbol
Description
1
VIN
Operating voltage input
2
Out
Switching output
3
FB
Output voltage feedback control
4
SD
ON/OFF Shutdown
GND
Ground Pin
5-8
ORDERING INFORMATION
CM2593/P X X
Lead Free
Output Voltage
Blank: Normal
G: Lead Free package
C: Adjustable
SC: 3.3V
ZJC: 5V
X
Package Type
S: SOP-O8 package
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Rating
Unit
VCC
Supply Voltage
+45
V
VSD
ON/OFF Pin input voltage
-0.3 to +25
V
VFB
Feedback Pin voltage
-0.3 to +25
V
VOUT
Output voltage to Ground
-1
V
PD
Power dissipation
Internally limited
TST
Storage temperature
W
-65 to +150
o
o
C
TOP
Operating temperature
-40 to +125
VOP
Operating voltage
+4.5 to +45
V
θJa
Thermal Resistance
75
°/W
θJc
Thermal Resistance
14
°/W
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
C
Page 3
CM2593/P
2A Step Down VOLTAGE REGULATOR
„ ELECTRICAL CHARACTERISTICS(All Output Voltage Versions)
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=24V for the 12V version. ILOAD = 0.2A
Symbol
IB
B
FOSC
Fscp
Parameter
Conditions
Min.
VFB=1.3V
Feedback bias current
Typ.
-10
(Adjustable version only)
150
173
-40℃<=TJ<=125℃
110
150
173
30
60
1.15
no outside circuit
Max. Duty Cycle(ON)
VFB=0V force driver on
100
Min. Duty cycle(OFF)
VFB=12V force driver off
0
current limit
no outside circuit
IL
Output = 1
IQ
2.4
ISTBY
no outside circuit
Output leakage
VFB=12 force driver off
current
VIN=24V
Quiescent Current
VFB=12 force driver off
Standby Quiescent
ON/OFF pin=5V
Current
VIN=24V
VIL
VIH
IH
Low (regulator ON)
ON/OFF pin logic input
threshold voltage
High (regulator OFF)
ON/OFF pin logic
2.8
5
70
-
3.6
2.0
A
uA
mA
10
150
200
mA
uA
0.6
1.3
-
-0.01
ON/OFF pin input current
VLOGIC=0.5V (ON)
-0.1
Ts
Over temperature shutdown
threshold
Tj increasing
175
Tj decreasing
150
Champion Microelectronic Corporation
V
%
-5
IL
2007/01/25 Rev. 1.4
1.5
-200
VLOGIC=2.5V (OFF)
input current
Khz
3.3
VFB=0 force driver on
Output = 0
nA
1.4
peak current
ICL
Unit
Khz
VFB=0V force driver on
DC
-100
127
Oscillator frequency of short When current limit occurred
circuit protect
and VFB <0.55V
saturation voltage
-50
TJ=25℃
oscillator frequency
IOUT=1.5A
VSAT
Max.
V
uA
-1
o
C
Page 4
CM2593/P
2A Step Down VOLTAGE REGULATOR
Symbol
Parameter
Conditions
Typ.
Limit
5V < VIN < 40V
VFB
Output Feedback
CM2593/P-ADJ
0.2A < ILOAD < 2A
V
1.235
VOUT programmed for 3V
η
VOUT
Efficiency
Output voltage
CM2593/P-3.3V
η
VOUT
Efficiency
Output voltage
CM2593/P-5V
η
Efficiency
VIN = 12V, ILOAD=2A
5.5V < VIN < 40V
0.2A < ILOAD < 2A
VIN = 12V, ILOAD=2A
8V < VIN < 40V
0.2A < ILOAD < 2A
VIN = 12V, ILOAD=2A
Unit
1.193/1.18
VMIN
1.267/1.28
VMAX
75
3.3
%
3.168/3.135
3.432/3.465
75
5
V
VMIN
VMAX
%
4.8/4.75
5.2/5.25
80
V
VMIN
VMAX
%
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 5
CM2593/P
2A Step Down VOLTAGE REGULATOR
FUNCTIONAL DESCRIPTION
Thermal Considerations
Pin Functions
+VIN
This is the positive input supply for the IC switching
The SOP-8 package needs a heat sink under most
conditions . The size of the heat-sink depends on the
regulator. A suitable input bypass capacitor must be
input voltage, the output voltage, the load current and the
present at this pin to minimize voltage transients and to
ambient
supply the switching currents needed by the regulator.
temperature rises above ambient temperature for a 2A
temperature.
The
CM2593/P
junction
load and different input and output voltages. The data
Out
Internal switch and power output. The voltage at this pin
switches between (+VIN – VSAT) and approximately –
0.5V, with a duty cycle of approximately VOUT / VIN. The
PC board copper area connected to this pin should be
kept a minimum in order to reduce the coupling
sensitivity to the circuitry
for these curves was taken with the CM2593/P (SOP-8
package) operating as a buck switching regulator in an
ambient temperature of 25oC (still air). These temperature
increments are all approximate and are affected by many
factors. Some of these factors include board size,
shape ,thickness ,position ,location, and even board
temperature. Other factors are trace width, total printed
Ground
Circuit ground.
circuit copper area, copper thickness , single or
Feedback
Complete the feedback loop by sensing the regulated
the board. Higher ambient temperatures require more
double-sided, multi-layer board and amount of solder on
output voltage
heat sinking.
For the best thermal performance ,wide copper traces
ON /OFF
Allows the switching regulator circuit to be shutdown
and generous amounts of printed circuit board copper
should be used in the board layout. (One exception is the
using logic level signals thus dropping the total input
out(switch) pin, which should not have large areas of
supply current to approximately 100uA. Pulling this pin
copper.) Large areas of copper provide the best transfer
below a threshold voltage of approximately 1.3V turns
of heat(lower thermal resistance) to the surrounding air,
the regulator on, and pulling this pin above 1.3V (up to a
and moving air lowers the thermal resistance even
maximum of 25V) shuts the regulator down. If this
further.
shutdown feature is not needed, the ON /OFF pin can
be wired to the ground pin or it can be left open, in either
case the regulator will be in the ON condition.
The effectiveness of the PC board to dissipate heat also
depends on the size, quantity and spacing of other
components on the board , as well as whether the
surrounding air is still or moving. Furthermore, some of
these components such as the catch diode will add heat
to the PC board and heat can vary as the input voltage
changes. For the inductor, depending on the physical
size, type of core material and the DC resistance, it could
either act as a heat sink taking heat away from the board,
or it could add heat to the board.
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 6
CM2593/P
2A Step Down VOLTAGE REGULATOR
APPLICATIONS CIRCUIT
470uF/50V
2
CM2593/P
VIN
1
1
2
5A/40V
1
2
3
1
L1
68uF
4
VIN
GND
OUT
GND
FB
GND
SD
GND
8
7
6
5
Output Voltage Fixed : R1=NC , R2=0
Output Voltage Adj : Vo=Vref*(1+(R2/R1))
Vfb = 1.235V ;
R1=1K~5K
2
2
1
220uF/25V
1
VOUT
2
R2
2
1
R1
APPLICATIONS Demo Board Layout
TOP Layer
BOT Layer
Notice :
1. R1/R2 must be close to Pin3 (VFB ), but keep feedback wiring away from inductor.
2. Inductor/diode must be close to Pin2 (Vout ), heavy lines must be keep short and thick .
3. Please to refer to Circuit and Demo Board Layout (the Fig. as above)
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 7
CM2593/P
2A Step Down VOLTAGE REGULATOR
DIFFERENT HEATSINK AREA
Thermal Resistance vs. Different Cooper Area Layout Design
Dog-Bone Layout
Minimum Footprint , θJA = 75℃/W
2
Copper Area = 30mm , θJA = 54℃/W
2
Copper Area = 10mm , θJA = 64℃/W
2
Copper Area = 50mm , θJA = 51℃/W
2
Copper Area = 70mm , θJA = 49℃/W
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 8
CM2593/P
2A Step Down VOLTAGE REGULATOR
Typical Performance Characteristics
(Test Figure 1 above unless otherwise specified)
T y p ic a l P e rfo rm a n c e C h a ra c te ris tic s
N o rm a lize d O u tp u t V o lta g e
Switch Saturation Voltage
Efficiency
1.7
1 : -40 oC
2 : 25 o C
3 : 125oC
OUTPUT VOLTAGE CHANGE
V IN = 20 V , I L O A D = 2 A
o
N orm alized at TJ = 25 C
2A Load
95
EFFICIENCY
(%)
5.0 5
5.0 0
SATURATION VOLTAGE (V)
5 .10
90
5V
85
80
4 .95
1.6
1.5
1.4
1
1.3
2
3.3V
75
3
1.2
4.9 0
-5 0
-25
0
25
50
75
100
70
125
2.0
8
10
15
20
25
30
4
3
5
40
35
SWITCH CURRENT(A)
JU N C T IO N T E M P E R A T U R E( o C )
JUNCTION TEMPERATURE(oC)
Switch Current Limit
Shutdown Quiescent Current
Operating Quiescent Current
8.0
200.0
20V 30V
4.0
2.0
130.0
20.0
15.0
CURRENT (uA)
VIN =10V
SUPPLY CURRENT (mA)
6.0
Switch
ON
10.0
Switch OFF
5.0
100.0
1
2
80.0
0
1
2
3
4
5
6
10
0.0
-50
7
Output current Io (A)
-25
0
25
50
75
=5
VON/OFF
V
1 : -40 oC
2 : 25 oC
3 : 125 oC
3
40.0
0.0
0.0
100
20
30
40
SUPPLY VOLOTAGE (V)
125
JUNCTION TEMPERATURE(oC)
ON/OFF Threshold
Voltage
Minimum Operating Supply
Voltage
O N /O F F P in C u r r e n t
( S in k in g )
5.0
THRESHOLD VOLTAGE
(V)
5.0
SUPPLY VOLTAGE (V)
Output voltage Vo(V)
25.0
4.0
3.0
2.0
1.0
VOUT =1.23V
ILOAD
=120mA
V IN = 4 0 V
o
- 4 0o C ≤ T J ≤ 1 2 5 C
4.0
3.0
2.0
1.0
1 .4
0.0
0.0
-50 -25
0
25
50
75 100 125
JUNCTION TEMPERATURE (
2007/01/25 Rev. 1.4
o
C)
-50 -25
0
25
50
75 100
JUNCTION TEMPERATURE (
o
Champion Microelectronic Corporation
125
5
10
15
20
22
23
O N /O F F P IN V O L T A G E (V )
C)
Page 9
24
25
CM2593/P
2A Step Down VOLTAGE REGULATOR
Switch
Frequency
Feedback Pin Bias
Current
200
100
10
40.0
30.0
20.0
Adjustable Version
Only
10.0
50
Output voltage Vo(V)
BIAS CURRENT
(nA)
150
FREQUENCY
(kHz)
Thermal protection
50.0
0
25
50
75
4
2
50
-50 -25
-50 -25
6
0
0.0
0.0
8
0
25
50
75
75
100
125
JUNCTION TEMPERATURE( C)
100 125
JUNCTION TEMPERATURE(
o
C)
JUNCTION TEMPERATURE ( C)
Light Load operation
Heavy Load operation
Load step
ILoad
1A/DIV
Iout
Iout
Vout ripple
20mV/div
Vout
50mV/DIV
0.5ms
Vin=12V
Vout=5V
Iload=0A
0.2ms/div
2007/01/25 Rev. 1.4
175
o
o
Vout ripple
0mV/div
150
100 125
Vin=12V
Vout=5V
Iload=2A
5us/div
Champion Microelectronic Corporation
Vin=12V
Vout=5V
ILOAD=0ATO2A
Page 10
200
CM2593/P
2A Step Down VOLTAGE REGULATOR
PACKAGE DIMENSION
8-PIN SOP (S08)
PIN 1 ID
θ
θ
8-Pin SOP w/ Power Pad (PS08)
θ
θ
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 11
CM2593/P
2A Step Down VOLTAGE REGULATOR
IMPORTNT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue
any integrated circuit product or service without notice, and advises its customers to obtain the latest version of
relevant information to verify, before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe
property or environmental damage.
CMC integrated circuit products are not designed, intended, authorized, or
warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of
CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks
associated with the customer’s applications, the customer should provide adequate design and operating safeguards.
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2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 12
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