CXSD62159恒频电流模式开关稳压器PFM/PWM模式操作电流模式控制车辆识别号上电复位（POR）和欠电压锁定

一,产品概述(General Description)         

       CXSD62159 is a 2A synchronous buck converter with integrated power MOSFETs. The CXSD62159 design with a current-mode control scheme, can convert wide input voltage of 4.5V to 24V to the output voltage adjustable from 0. 8V to 20V to provide excellent output voltage regulation. The CXSD62159 is equipped with an automatic PFM/PWM mode operation. At light load, the IC operates in the PFM mode to reduce the switching losses. At heavy load, the IC works in PWM. The CXSD62159 is also equipped with Power-on-reset, softstart, soft-stop, and whole protections (under-voltage, over-temperature, and current-limit) into a single package. This device, available TDFN3x3-10, provides a very compact system solution external components and PCB area

Main Control Loop

        The CXSD62159 is a constant frequency current mode switching regulator.
During normal operation, the internal N-channel power MOSFET is turned on
each cycle when the oscillator sets an internal RS latch and would be turned
off when an internal current comparator (ICMP) resets the latch. The peak
inductor current at which ICMP resets the RS latch is controlled by the voltage
on the COMP pin, which is the output of the error amplifier (EAMP). An external
resistive divider connected between VOUT and ground allows the EAMP to
receive an output feedback voltage VFB at FB pin. When the load current
increases, it causes a slight decrease in VFB relative to the 0.8V reference,
which in turn causes the COMP voltage to increase until the average inductor
current matches the new load current.
VIN Power-On-Reset (POR) and EN Under-voltageLockout
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logic
operations which may occur when VIN voltage is not high enough for the internal
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed at
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.
The EN pin should be connected a resistor divider from VIN to EN .After the VIN
and EN voltages exceed their respective voltage thresholds, the IC starts a
start-up process and then ramps up the output voltage to the setting of output
voltage.
Over-Temperature Protection (OTP)
The over-temperature circuit limits the junction tempera ture of the CXSD62159
When the junction temperature exceeds TJ =+160oC, a thermal sensor turns
off the power MOSFET, allowing the device to cool down. The thermal sensor
allows the converter to start a start-up process and regulate the output voltage
again after the junction temperature cools by 50oC.The OTP designed with a 50 oC
hysteresis lowers the average T J during c ontinuous thermal overload conditions,
increasing life time of the IC.
Enable/Shutdown
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, the
internal N-Channel power MOSFET turns off, all internal circuitry shuts down and
the quiescent supply current reduces to 0.3μA.
Current-Limit Protection
The CXSD62159 monitors the output current, flowing through the N-Channel power
MOSFET, and limits the IC from damages during overload, short-circuit and over-
voltage conditions. 
Frequency Foldback
The foldback frequency is controlled by the FB voltage.When the FB pin voltage
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lower
frequency allows the inductor current to safely discharge,thereby preventing current
runaway. The oscillator’s frequency will switch to its designed rate when the feedback
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.
Over-Voltage Protection
The over-voltage function monitors the output voltage by FB pin. When the FB voltage
increase over 120% of the reference voltage, the over-voltage protection compara-
tor will force the high-and low-side MOSFET gate driver off. As soon as the output
voltage is within regulation, the OVP comparator is disengaged. The chip will restore its
normal operation.
二.产品特点(Features)
Wide Input Voltage from 4.5V to 24V
2A Continuous Output Current
Adjustable Output Voltage from 0.8V to 20V
Intergrated High/Low Side MOSFET
PFM/PWM mode Operation
Fixed 340kHz Switching Frequency
Stable with Low ESR Ceramic Output Capacitors
Power-On-Reset Detection
Programmable Soft-Start
Over-Temperature Protection
Current-Limit Protection with Frequency Foldback
Enable/Shutdown Function
Small TDFN3x3-10 Packages
Lead Free and Green Devices Available (RoHS Compliant)
三,应用范围 (Applications) 

LCD Monitor/TV

Set-Top Box
DSL, Switch HUB
Notebook Computer

四.下载产品资料PDF文档 

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

五,产品封装图 (Package)

六.电路原理图

Switching Regulator > Buck Converter

 Part_No 

 Package

Architectu

No.of

PWM 

Outpu

Drive

Lout

(A) 

Vin(V) 

Fmax

Khz 

Vref 

(V) 

R-Top (milohm) 

R-Sync (milohm) 

Iq (No load) (uA) 

min

max

CXSD62122

TQFN5x6-28

CM

1

5

4.5

26

380

0.8

50

20

1000

CXSD62123

SOP-8

CM

1

2

4.5

26

380

0.8

100

1000

CXSD62124

SOP-8P

CM

1

4

4.5

26

380

0.8

80

1000

CXSD62125

SOT23-5|TSOT23-5

CM

1

1

2.7

6

1500

0.6

280

250

25

CXSD62125A

SOT23-5

CM

1

1

2.7

6

1500

0.6

280

250

CXSD62126

SOP-8

CM

1

3

4.3

14

500

0.8

70

70

500

CXSD62127

SOP-8P

CM

1

3

4.3

14

500

0.8

55

45

500

CXSD62128B

TDFN3x3-10

3

2.6

5.5

2000

0.8

110

110

460

CXSD62129

TDFN3x3-10

CM

2

1

2.7

6

1500

0.6

280

250

500

CXSD62129A

TDFN3x3-10

CM

2

1

2.7

6

1500

0.6

280

250

CXSD62130

TDFN2x2-6

CM

1

1

2.7

6

1500

0.6

280

250

25

CXSD62130A

TDFN2x2-6

CM

1

1

2.7

6

1500

0.6

280

250

CXSD62131

TDFN3x3-12

CM

2

1

2.7

6

1500

0.6

280

250

25

CXSD62131A

TDFN3x3-12

CM

2

1

2.7

6

1500

0.6

280

250

CXSD62131C

TDFN 3x3 12

CM

2

1

3

5.5

1500

0.6

280

250

30

CXSD62132

TQFN3x3-20

CM

3

2

2.9

5.5

1500

0.6

-

-

300

CXSD62133

TDFN2x2-8

CM

1

1

3.3

8

1500

0.6

280

250

25

CXSD62134

SOP-8

CM

1

2

4.5

24

340

0.925

110

110

1900

CXSD62135

SOP-8P

CM

1

3

4.5

24

340

0.925

110

110

1900

CXSD62136

SOP-8

CM

1

2

4.5

24

340

0.92

130

130

1900

CXSD62136B

SOP-8P

CM

1

2

4.5

24

340

0.92

130

130

1900

CXSD62137

SOP-8P

CM

1

3

4.5

24

340

0.92

85

85

1900

CXSD62138

SOP-8P

CM

1

4

4.5

24

340

0.8

85

85

1900

CXSD62139

TSOT-23-8A

CM

1

3

4.5

24

500

0.807

100

40

1000

CXSD62140

TSOT-23-8A

CM

1

3

4.5

24

500

0.807

100

40

1000

CXSD62141

TSOT-23-8A

CM

1

2

4.5

24

500

0.807

115

50

1000

CXSD62142

SOP-8P

CM

1

3

4.5

24

1300

0.925

110

110

1900

CXSD62143

SOP-8

CM

1

2

4.5

24

340

0.925

110

110

1900

CXSD62144

SOP-8P

CM

1

3

4.5

24

340

0.925

110

110

1900

CXSD62145

TSOT-23-8A

CM

1

2

4.5

24

500

0.807

115

50

500

CXSD62146

TSOT-23-8A

CM

1

3

4.5

24

500

0.807

100

40

500

CXSD62147

TSOT-23-6

COT

1

2

4.6

16

500

0.6

110

100

50

CXSD62148

TSOT-23-6

COT

1

2

4.6

16

500

0.8

95

40

50

CXSD62149

TSOT-23-6

COT

1

3

4.6

16

500

0.8

90

35

50

CXSD62150

TSOT-23-8A

CM

1

2.5

4.5

24

500

0.807

140

60

1000

CXSD62151

TSOT-23-6,TDFN2x2-6

COT

1

3

4.6

16

500

0.6

110

80

50

CXSD62152

SOP8P|TDFN3x3-10

CM

1

2

2.5

6

1000

0.8

85

75

460

CXSD62153

SOP8P|TDFN3x3-10

CM

1

3.2

2.5

6

1000

0.8

85

75

460

CXSD62154

SOP8P|TDFN3x3-10

CM

1

4

2.5

6

500

0.8

85

75

460

CXSD62155

SOP-8P

CM

1

5

2.5

6

1000

0.6

65

55

460

CXSD62156

TDFN 2x2 12

CM

1

3.5

2.7

5.5

1320

0.6

70

60

40

CXSD62157

SOP-8

CM

1

2

4.5

24

340

0.8

110

110

1900

CXSD62158

SOP-8P

CM

1

3

4.5

24

340

0.8

110

110

1900

CXSD62159

TDFN3x3-10

CM

1

2

4.5

24

340

0.8

110

110

1900

CXSD62160

TDFN3x3-10

CM

1

3

4.5

24

340

0.8

110

110

1900

CXSD62161

TSOT-23-8A

CM

1

2

4.5

24

500

0.791

115

50

1000

CXSD62162

TSOT-23-8A

CM

1

3

4.5

24

500

0.791

100

40

1000

CXSD62162S

TSOT-23-8A

CM

1

3

7

24

500

0.791

100

40

1000

CXSD62163

TDFN 2x2-6

CM

1

1

3

5.5

1500

0.6

260

230

30

CXSD62164

SOT23-5,TSOT23-5A

CM

1

1.2

3

5.5

1500

0.6

260

230

30

CXSD62164A

SOT23-5,TSOT23-5A

CM

1

1

3

5.5

1500

0.6

260

230

30

CXSD62164C

SOT23-5,TSOT23-5A

CM

1

1

3

5.5

1500

0.6

260

230

30

CXSD62165

SOT23-5,TSOT23-5A

CM

1

1.2

3

5.5

1500

0.6

260

230

30

CXSD62165C

SOT23-5,TSOT23-5A

CM

1

1

3

5.5

1500

0.6

260

230

30

CXSD62166

TSOT-23-8A

CM

1

2

4.5

24

800

0.807

115

50

1000

CXSD62167

TSOT-23-8A

CM

1

3

4.5

24

800

0.807

100

40

1000

CXSD62168

TSOT-23-8A

CM

1

2

4.5

24

500

0.807

115

50

1000

CXSD62169

TDFN5x5-16

CM

1

4

4.5

26

380

0.8

22

-

1000

CXSD62170

TDFN 2x2-8

CM

1

0.8

4.5

5.5

1700   ~ 2300

0.6

300

CXSD62171

TQFN 4x4 22

COT

1

8

2.7

28

100~1000

0.8

30

9

700

CXSD62172

TQFN4x4-23

COT

1

6

2.7

28

100~1000

0.8

30

9

750

CXSD62172A

TQFN 4x4 23

COT

1

8

2.7

28

100~1000

0.8

30

9

700

CXSD62172B

TQFN 4x4 23

COT

1

8

2.7

28

100~1000

0.8

30

9

700

CXSD62172C

TQFN 4x4 23

COT

1

10

2.7

28

100~1000

0.8

27

7

700

CXSD62172CA

TQFN 4x4 23

COT

1

10

2.7

28

100~1000

0.8

27

7

700

CXSD62172D

TQFN 4x4 23

COT

1

10

2.7

28

100~1000

0.8

27

7

700

CXSD62172DA

TQFN 4x4 23

COT

1

10

2.7

28

100~1000

0.8

27

7

700

CXSD62172E

TQFN 4x4 23

COT

1

8

2.7

28

100~1000

0.8

30

9

25

CXSD62173

TQFN 4x4 23

COT

1

6

2.7

28

100~1000

0.8

30

12

700

CXSD62173A

TQFN 4x4 23

COT

1

6

2.7

28

100~1000

0.8

30

12

700

CXSD62173C

TQFN 4x4 23

COT

1

6

2.7

28

100~1000

0.8

30

12

700

CXSD62173D

TQFN 4x4 23

COT

1

6

2.7

28

100~1000

0.8

30

12

700

CXSD62173E

TQFN 4x4 23

COT

1

8

2.7

28

100~1000

0.8

30

12

25

CXSD62174

TQFN5x5 30

COT

1

12

2.7

28

300~1000

0.8

9.7

5.2

700

CXSD62174A

TQFN5x5 30

COT

1

12

2.7

28

300~1000

0.8

14.6

7.8

750

CXSD62175

TQFN5x6-28

COT

1

8

3

25

500

0.75

12

12

400

CXSD62176

TDFN3x3-10

CM

1

3

2.6

6

1000

0.6

65

55

460

CXSD62176E

TDFN3x3-10

CM

1

3

2.6

5.5

1000

0.6

65

55

65

CXSD62177

TDFN3x3-10

CM

1

3

2.6

6

1000

0.6

75

55

460

CXSD62177A

TDFN3x3 10

CM

1

3

2.6

6

1000

0.8

75

55

460

CXSD62177B

TDFN3x3 10

CM

1

3

2.6

6

1000

0.8

75

55

460

CXSD62178

TQFN3x3-16

COT

1

8

6

28

500

0.6

24

14

80

CXSD62179

TSOT23-6

CM

1

1

2.7

5.5

1500

0.6

280

250

25

CXSD62180

SOT23-6, TDFN2x2 8

CM

1

3

2.6

6

1000

0.6

110

80

50

CXSD62181

TDFN3x3-10

CM

1

3

4.5

24

600

0.8

70

70

400

CXSD62182

TQNF4x4 32

COT

1

8

4.5

26

400~550

0.75

75

75

230

CXSD62183

TQN 4x4 26

COT

2

8

4.5

25

400~1400

(VDDQ)

1000(VPP)

0.6V for VPPSMBUS for VDDQ=1.0V~1.2V

20(VDDQ)

200(VPP)

7(VDDQ)

200(VPP)

270