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CM2593/P
2A Step Down VOLTAGE REGULATOR GENERAL DESCRIPTION
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

FEATURES
3.3V, 5V and adjustable output versions Adjustable version output voltage range, 1.23V to 37V +4% max over line and load condition 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
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.
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
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. 1 2 3 4 5-8 Symbol Description
VIN Out FB SD GND
Operating voltage input Switching output Output voltage feedback control ON/OFF Shutdown Ground Pin
ORDERING INFORMATION
CM2593/P X X X
Lead Free
Blank: Normal G: Lead Free package
Output Voltage
C: Adjustable SC: 3.3V ZJC: 5V
Package Type
S: SOP-O8 package
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VSD VFB VOUT PD TST TOP VOP Ja Jc Parameter Supply Voltage ON/OFF Pin input voltage Feedback Pin voltage Output voltage to Ground Power dissipation Storage temperature Operating temperature Operating voltage
Thermal Resistance Thermal Resistance
Rating +45 -0.3 to +25 -0.3 to +25 -1 Internally limited -65 to +150 -40 to +125 +4.5 to +45
75 14
Unit V V V V W
o o
C C
V
/W /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 IB
B
Parameter Feedback bias current
Conditions VFB=1.3V (Adjustable version only)
TJ=25 -40<=TJ<=125
Min.
Typ. -10
Max. -50 -100 173
Unit nA
127 110
150 150 30
FOSC
oscillator frequency
Khz 173 60 1.4 1.15 1.5 V Khz
Fscp
Oscillator frequency of short When current limit occurred circuit protect and VFB <0.55V IOUT=1.5A
VSAT
saturation voltage
no outside circuit VFB=0V force driver on
DC
Max. Duty Cycle(ON) Min. Duty cycle(OFF)
VFB=0V force driver on VFB=12V force driver off peak current
100 0 3.3 2.4 2.8 3.6
%
ICL
current limit
no outside circuit VFB=0 force driver on
A
IL
Output = 0 Output = 1
no outside circuit Output leakage VFB=12 force driver off current VIN=24V VFB=12 force driver off ON/OFF pin=5V VIN=24V Low (regulator ON) 2.0
-200 -5 5 70 10 150 200 0.6 1.3 -
uA mA mA uA
IQ ISTBY VIL VIH
Quiescent Current Standby Quiescent Current ON/OFF pin logic input threshold voltage ON/OFF pin logic input current ON/OFF pin input current Over temperature shutdown threshold
High (regulator OFF)
V
IH IL Ts
VLOGIC=2.5V (OFF) VLOGIC=0.5V (ON) Tj increasing Tj decreasing -0.1 175 150
-0.01 -1
uA
o
C
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 4
CM2593/P
2A Step Down VOLTAGE REGULATOR
Symbol
Parameter
Conditions
5V < VIN < 40V
Typ.
Limit
Unit
V
VFB
Output Feedback
0.2A < ILOAD < 2A VOUT programmed for 3V
1.235
1.193/1.18 1.267/1.28
VMIN VMAX %
CM2593/P-ADJ
VOUT
Efficiency
VIN = 12V, ILOAD=2A 5.5V < VIN < 40V 0.2A < ILOAD < 2A VIN = 12V, ILOAD=2A
75 3.168/3.135 3.432/3.465
V VMIN VMAX %
Output voltage
3.3
CM2593/P-3.3V
Efficiency
75
VOUT
Output voltage
8V < VIN < 40V 0.2A < ILOAD < 2A VIN = 12V, ILOAD=2A
5
4.8/4.75 5.2/5.25
V VMIN VMAX %
CM2593/P-5V
Efficiency
80
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25C.
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 5
CM2593/P
2A Step Down VOLTAGE REGULATOR FUNCTIONAL DESCRIPTION
Pin Functions
+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. 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
ON /OFF Allows the switching regulator circuit to be shutdown
Thermal Considerations 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 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. 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. 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.
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 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
2 1 1 2
CM2593/P VIN
1 2 3 VIN OUT FB SD GND GND GND 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
5A/40V
1
L1 68uF
2
4
2
1
1
2
2
1
220uF/25V
VOUT
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 , JA = 75/W
Copper Area = 10mm , JA = 64/W
2
Copper Area = 30mm , JA = 54/W
2
Copper Area = 50mm , JA = 51/W
2
Copper Area = 70mm , JA = 49/W
2
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
5 .10
Efficiency
1.7
SATURATION VOLTAGE (V)
Switch Saturation Voltage 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
5.0 5
95
EFFICIENCY (%)
2A Load
1.6 1.5 1.4
90 85 80 75
5.0 0
5V
1 1.3 1.2 3 2.0 3 4 5 2
4 .95
3.3V
4.9 0 -5 0 -25 0 25 50 75 100 125
70 8 10 15 20 25 30 35 40
JUNCTION TEMPERATURE(oC)
JU N C T IO N T E M P E R A T U R E( o C )
SWITCH CURRENT(A)
Switch Current Limit
8.0
Operating Quiescent Current
25.0
SUPPLY CURRENT (mA)
200.0 130.0
CURRENT (uA)
Shutdown Quiescent Current
Output voltage Vo(V)
6.0
VIN =10V
20.0 15.0 10.0 5.0 0.0
20V 30V
4.0
Switch ON Switch OFF
100.0
1 2
80.0 40.0 0.0 10 20
3
2.0
=5 VON/OFF V 1 : -40 oC 2 : 25 oC 3 : 125 oC
30 40
0.0 0 1 2 3 4 5 6 7
Output current Io (A)
-50
-25
0
25
50
75
100
125
SUPPLY VOLOTAGE (V)
JUNCTION TEMPERATURE(oC)
Minimum Operating Supply Voltage
5.0 4.0 3.0 2.0 1.0 0.0 -50 -25 0 25 50 75 100 125
o
ON/OFF Threshold Voltage
5.0
THRESHOLD VOLTAGE (V)
O N /O F F P in C u r r e n t ( S in k in g )
4.0 3.0 2.0 1.0 0.0 -50 -25 0 25 50 75 100
o
SUPPLY VOLTAGE (V)
V IN = 4 0 V o - 4 0o C T J 1 2 5 C
VOUT =1.23V ILOAD =120mA
1 .4
5
10
15
20
22
23
24
25
125
O N /O F F P IN V O L T A G E (V )
JUNCTION TEMPERATURE (
C)
JUNCTION TEMPERATURE (
C)
2007/01/25 Rev. 1.4
Champion Microelectronic Corporation
Page 9
CM2593/P
2A Step Down VOLTAGE REGULATOR
Switch Frequency
200
Feedback Pin Bias Current
50.0
Output voltage Vo(V)
Thermal protection
10 8 6 4 2 0 50 75 100 125 150 175
o
150
FREQUENCY (kHz)
BIAS CURRENT (nA)
40.0 30.0 20.0 10.0 0.0
100
Adjustable Version Only
50
200
0.0 -50 -25 0 25 50 75 100 125
o
-50 -25
0
25
50
75
o
100 125
JUNCTION TEMPERATURE( C)
JUNCTION TEMPERATURE(
C)
JUNCTION TEMPERATURE ( C)
Light Load operation
Heavy Load operation
Load step
Iout
ILoad 1A IV /D V out 50m /D V IV 0.5m s
Iout ut ripple m /div V
Vout ripple 20m /div V
V= in 12V V 5V out= Iload 0A =
0.2m s/div
Vin=12V Vout=5V Iload=2A
5us/div
V= in 12V V 5V out= O ILOAD=0AT 2A
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
8-Pin SOP w/ Power Pad (PS08)
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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