CM2593-5V [CHAMP]
2A Step Down VOLTAGE REGULATOR; 2A降压稳压器
| 型号： | CM2593-5V |
| 厂家： | 
CHAMPION MICROELECTRONIC CORP. |
| 描述： | 2A Step Down VOLTAGE REGULATOR |
| 文件： | 总12页 (文件大小：286K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CM2593/P
2A Step Down VOLTAGE REGULATOR
GENERAL DESCRIPTION
FEATURES
◆
◆
3.3V, 5V and adjustable output versions
Adjustable version output voltage range, 1.23V to 37V +4%
max over line and load condition
The CM2593/P is a monolithic integrated circuit that
provide all the active functions for a step-down
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
function can be controlled by TTL logic level and
then come into standby mode. The internal
compensation makes feedback control have good
line and load regulation without external design.
Regarding protected function, thermal shutdown is
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
available in a standard 8-lead SOP8.
◆
◆
◆
◆
◆
◆
◆
◆
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SOP-8L packages
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Input voltage range up to 40V
Output load current: 2A
150 kHz fixed frequency internal oscillator
Low power standby mode
Built-in switching transistor on chip
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
TYPICAL APPLICATIONS
Figure 1. Basic Application Circuit with CM2593/P fixed version
Champion Microelectronic Corporation
2007/01/25 Rev. 1.4
Page 1
CM2593/P
2A Step Down VOLTAGE REGULATOR
PIN CONFIGURATION
Sop08
Sop08
Top View(CM2593)
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
VIN
Operating voltage input
Switching output
1
2
Out
FB
Output voltage feedback control
ON/OFF Shutdown
Ground Pin
3
SD
4
GND
5-8
ORDERING INFORMATION
CM2593/P
X
X
X
Lead Free
Package Type
Output Voltage
S: SOP-O8 package
Blank: Normal
G: Lead Free package
C: Adjustable
SC: 3.3V
ZJC: 5V
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Rating
+45
Unit
V
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
VSD
-0.3 to +25
-0.3 to +25
-1
V
VFB
V
VOUT
PD
V
Internally limited
-65 to +150
-40 to +125
+4.5 to +45
75
W
oC
oC
V
TST
Storage temperature
Operating temperature
Operating voltage
TOP
VOP
Thermal Resistance
°/W
θJa
θJc
Thermal Resistance
14
°/W
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
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
Parameter
Conditions
VFB=1.3V
Min.
Typ.
Max.
-50
Unit
IB
Feedback bias current
-10
nA
(Adjustable version only)
TJ=25℃
-100
173
127
110
150
150
FOSC
Fscp
oscillator frequency
Khz
Khz
173
60
-40℃<=TJ<=125℃
Oscillator frequency of short When current limit occurred
circuit protect
30
and VFB <0.55V
IOUT=1.5A
1.4
VSAT
DC
ICL
saturation voltage
1.15
V
%
A
no outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
peak current
1.5
Max. Duty Cycle(ON)
Min. Duty cycle(OFF)
100
0
3.3
3.6
current limit
2.4
2.8
no outside circuit
VFB=0 force driver on
no outside circuit
VFB=12 force driver off
VIN=24V
Output = 0
-200
uA
Output leakage
current
IL
Output = 1
-5
5
mA
mA
IQ
Quiescent Current
Standby Quiescent
Current
VFB=12 force driver off
ON/OFF pin=5V
VIN=24V
10
150
200
0.6
ISTBY
VIL
70
uA
Low (regulator ON)
-
ON/OFF pin logic input
threshold voltage
1.3
V
VIH
High (regulator OFF)
2.0
-
ON/OFF pin logic
input current
IH
IL
V
LOGIC=2.5V (OFF)
-0.01
-1
uA
oC
ON/OFF pin input current
VLOGIC=0.5V (ON)
Tj increasing
-0.1
175
150
Over temperature shutdown
threshold
Ts
Tj decreasing
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 4
CM2593/P
2A Step Down VOLTAGE REGULATOR
Symbol
VFB
Parameter
Output Feedback
Efficiency
Conditions
Typ.
1.235
75
Limit
Unit
5V < VIN < 40V
0.2A < ILOAD < 2A
V
1.193/1.18
1.267/1.28
VMIN
VMAX
CM2593/P-ADJ
CM2593/P-3.3V
V
OUT programmed for 3V
η
VIN = 12V, ILOAD=2A
%
V
5.5V < VIN < 40V
0.2A < ILOAD < 2A
3.168/3.135
3.432/3.465
VOUT
Output voltage
Efficiency
3.3
VMIN
VMAX
η
VIN = 12V, ILOAD=2A
75
%
V
8V < VIN < 40V
4.8/4.75
5.2/5.25
VOUT
Output voltage
Efficiency
5
VMIN
VMAX
0.2A < ILOAD < 2A
CM2593/P-5V
η
VIN = 12V, ILOAD=2A
80
%
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
The SOP-8 package needs a heat sink under most
conditions . The size of the heat-sink depends on the
input voltage, the output voltage, the load current and the
+VIN
This is the positive input supply 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.
ambient
temperature.
The
CM2593/P
junction
temperature rises above ambient temperature for a 2A
load and different input and output voltages. The data
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
circuit copper area, copper thickness , single or
double-sided, multi-layer board and amount of solder on
the board. Higher ambient temperatures require more
heat sinking.
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
Ground
Circuit ground.
Feedback
Complete the feedback loop by sensing the regulated
output voltage
For the best thermal performance ,wide copper traces
and generous amounts of printed circuit board copper
should be used in the board layout. (One exception is the
out(switch) pin, which should not have large areas of
copper.) Large areas of copper provide the best transfer
of heat(lower thermal resistance) to the surrounding air,
and moving air lowers the thermal resistance even
further.
ON/OFF
Allows the switching regulator circuit to be shutdown
using logic level signals thus dropping the total input
supply current to approximately 100uA. Pulling this pin
below a threshold voltage of approximately 1.3V turns
the regulator on, and pulling this pin above 1.3V (up to a
maximum of 25V) shuts the regulator down. If this
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.
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.
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 6
CM2593/P
2A Step Down VOLTAGE REGULATOR
APPLICATIONS CIRCUIT
470uF/50V
CM2593/P
VIN
2
1
1
2
3
4
8
VIN
GND
GND
GND
GND
1
2
7
6
5
OUT
FB
Output Voltage Fixed : R1=NC , R2=0
Output Voltage Adj : Vo=Vref*(1+(R2/R1))
1
2
5A/40V
L1
SD
68uF
Vfb = 1.235V
;
R1=1K~5K
2
1
1
2
2
1
VOUT
220uF/25V
R2
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
Copper Area = 10mm2 , θJA = 64℃/W
Copper Area = 30mm2 , θJA = 54℃/W
Copper Area = 50mm2 , θJA = 51℃/W
Copper Area = 70mm2 , 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)
Typical Performance Characteristics
Norm alized Output Voltage
Switch Saturation Voltage
Efficiency
1.7
1.6
1.5
1.4
1.3
1.2
1 : -40 o
C
5.10
2 : 25o C
VIN =20V, ILOAD =2A
Normalized at TJ =25
oC
3 : 125o
C
2A Load
95
90
85
80
75
70
5.05
5.00
4.95
4.90
5V
1
2
3.3V
3
2.0
-50
-25
0
25
50
75
100 125
4
5
3
30
40
8
10 15
20
25
35
JUNCTION TEMPERATURE(oC)
SWITCH CURRENT(A)
JUNCTION TEMPERATURE(oC)
Switch Current Limit
Shutdown Quiescent Current
Operating Quiescent Current
8.0
200.0
130.0
100.0
80.0
40.0
0.0
25.0
20.0
15.0
10.0
5.0
6.0
4.0
2.0
0.0
VIN =10V 20V 30V
Switch
ON
1
2
=5
V
VON/OFF
1 : -40 oC
2 : 25 oC
3 : 125 oC
3
Switch OFF
10
20
30
40
0.0
SUPPLY VOLOTAGE (V)
-50 -25
0
25
50 75 100 125
0
1
2
3
4
5
6
7
JUNCTION TEMPERATURE(oC)
Output current Io (A)
ON/OFF Threshold
Voltage
O N /O F F P in C u rre n t
(S in k in g )
Minimum Operating Supply
Voltage
5.0
5.0
IN
V
= 4 0V
oC
4.0
3.0
2.0
1.0
0.0
-4 0o
≤
T J
≤
1 2 5
C
4.0
3.0
2.0
1.0
0.0
VOUT
ILOAD
=1.23V
=120mA
1 .4
5
1 0
1 5
2 0 2 2
2 3
2 4
2 5
O N /O F F P IN V O L T A G E (V )
-50
0
100 125
25 50 75
-25
-50 -25
0
25 50 75 100 125
JUNCTION TEMPERATURE ( o C)
o
JUNCTION TEMPERATURE ( C)
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 9
CM2593/P
2A Step Down VOLTAGE REGULATOR
Switch
Feedback Pin Bias
Frequency
Current
Thermal protection
200
150
100
50.0
40.0
30.0
20.0
10.0
0.0
10
8
6
4
Adjustable Version
Only
2
0
50
50
75
100 125
150 175 200
-50 -25
0
25 50 75 100 125
0.0
JUNCTION TEMPERATURE(o
C)
-50 -25
0
25 50 75 100 125
oC)
o
JUNCTION TEMPERATURE(
C)
JUNCTION TEMPERATURE (
Light Load operation
Heavy Load operation
Load step
ILoad
1A/DIV
Iout
Iout
Vout ripple
20mV/div
Vout
50mV/DIV
Vout ripple
0mV/div
0.5ms
Vin=12V
0.2ms/div
Vin=12V
Vout=5V
Iload=0A
Vout=5V
ILOAD=0ATO2A
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 10
CM2593/P
2A Step Down VOLTAGE REGULATOR
PACKAGE DIMENSION
8-PIN SOP (S08)
PIN 1 ID
θ
8-Pin SOP w/ Power Pad (PS08)
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.
HsinChu Headquarter
Sales & Marketing
5F, No. 11, Park Avenue II,
Science-Based Industrial Park,
HsinChu City, Taiwan 300
7F-6, No.32, Sec. 1, Chenggong Rd.,
Nangang District, Taipei City 115,
Taiwan R.O.C.
TEL: +886-3-567 9979
T E L : +886-2-2788 0558
F AX: +886-2-2788 2985
FAX: +886-3-567 9909
http://www.champion-micro.com
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 12
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