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)         1HG嘉泰姆

       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 area1HG嘉泰姆

Main Control Loop1HG嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.1HG嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned on1HG嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turned1HG嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peak1HG嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltage1HG嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An external1HG嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP to1HG嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load current1HG嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,1HG嘉泰姆
which in turn causes the COMP voltage to increase until the average inductor1HG嘉泰姆
current matches the new load current.1HG嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockout1HG嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logic1HG嘉泰姆
operations which may occur when VIN voltage is not high enough for the internal1HG嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)1HG嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed at1HG嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.1HG嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VIN1HG嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts a1HG嘉泰姆
start-up process and then ramps up the output voltage to the setting of output1HG嘉泰姆
voltage.1HG嘉泰姆
Over-Temperature Protection (OTP)1HG嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD621591HG嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turns1HG嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensor1HG嘉泰姆
allows the converter to start a start-up process and regulate the output voltage1HG嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oC1HG嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,1HG嘉泰姆
increasing life time of the IC.1HG嘉泰姆
Enable/Shutdown1HG嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, the1HG嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down and1HG嘉泰姆
the quiescent supply current reduces to 0.3μA.1HG嘉泰姆
Current-Limit Protection1HG嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel power1HG嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-1HG嘉泰姆
voltage conditions. 1HG嘉泰姆
Frequency Foldback1HG嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage1HG嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lower1HG嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing current1HG嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedback1HG嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.1HG嘉泰姆
Over-Voltage Protection1HG嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage1HG嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-1HG嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the output1HG嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore its1HG嘉泰姆
normal operation.1HG嘉泰姆
二.产品特点(Features)1HG嘉泰姆
Wide Input Voltage from 4.5V to 24V1HG嘉泰姆
2A Continuous Output Current1HG嘉泰姆
Adjustable Output Voltage from 0.8V to 20V1HG嘉泰姆
Intergrated High/Low Side MOSFET1HG嘉泰姆
PFM/PWM mode Operation1HG嘉泰姆
Fixed 340kHz Switching Frequency1HG嘉泰姆
Stable with Low ESR Ceramic Output Capacitors1HG嘉泰姆
Power-On-Reset Detection1HG嘉泰姆
Programmable Soft-Start1HG嘉泰姆
Over-Temperature Protection1HG嘉泰姆
Current-Limit Protection with Frequency Foldback1HG嘉泰姆
Enable/Shutdown Function1HG嘉泰姆
Small TDFN3x3-10 Packages1HG嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)1HG嘉泰姆
三,应用范围 (Applications) 1HG嘉泰姆

LCD Monitor/TV1HG嘉泰姆

Set-Top Box1HG嘉泰姆
DSL, Switch HUB1HG嘉泰姆
Notebook Computer1HG嘉泰姆

四.下载产品资料PDF文档 1HG嘉泰姆

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！1HG嘉泰姆

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五,产品封装图 (Package)1HG嘉泰姆

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六.电路原理图1HG嘉泰姆

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Switching Regulator > Buck Converter1HG嘉泰姆

 Part_No 1HG嘉泰姆

 Package1HG嘉泰姆

Architectu1HG嘉泰姆

No.of1HG嘉泰姆

PWM 1HG嘉泰姆

Outpu1HG嘉泰姆

Drive1HG嘉泰姆

Lout1HG嘉泰姆

(A) 1HG嘉泰姆

Vin(V) 1HG嘉泰姆

Fmax1HG嘉泰姆

Khz 1HG嘉泰姆

Vref 1HG嘉泰姆

(V) 1HG嘉泰姆

R-Top (milohm) 1HG嘉泰姆

R-Sync (milohm) 1HG嘉泰姆

Iq (No load) (uA) 1HG嘉泰姆

min1HG嘉泰姆

max1HG嘉泰姆

CXSD621221HG嘉泰姆

TQFN5x6-281HG嘉泰姆

CM1HG嘉泰姆

11HG嘉泰姆

51HG嘉泰姆

4.51HG嘉泰姆

261HG嘉泰姆

3801HG嘉泰姆

0.81HG嘉泰姆

501HG嘉泰姆

201HG嘉泰姆

10001HG嘉泰姆

CXSD621231HG嘉泰姆

SOP-81HG嘉泰姆

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21HG嘉泰姆

4.51HG嘉泰姆

261HG嘉泰姆

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0.81HG嘉泰姆

1001HG嘉泰姆

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CXSD621241HG嘉泰姆

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CM1HG嘉泰姆

11HG嘉泰姆

41HG嘉泰姆

4.51HG嘉泰姆

261HG嘉泰姆

3801HG嘉泰姆

0.81HG嘉泰姆

801HG嘉泰姆

10001HG嘉泰姆

CXSD621251HG嘉泰姆

SOT23-5|TSOT23-51HG嘉泰姆

CM1HG嘉泰姆

11HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

15001HG嘉泰姆

0.61HG嘉泰姆

2801HG嘉泰姆

2501HG嘉泰姆

251HG嘉泰姆

CXSD62125A1HG嘉泰姆

SOT23-51HG嘉泰姆

CM1HG嘉泰姆

11HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

15001HG嘉泰姆

0.61HG嘉泰姆

2801HG嘉泰姆

2501HG嘉泰姆

CXSD621261HG嘉泰姆

SOP-81HG嘉泰姆

CM1HG嘉泰姆

11HG嘉泰姆

31HG嘉泰姆

4.31HG嘉泰姆

141HG嘉泰姆

5001HG嘉泰姆

0.81HG嘉泰姆

701HG嘉泰姆

701HG嘉泰姆

5001HG嘉泰姆

CXSD621271HG嘉泰姆

SOP-8P1HG嘉泰姆

CM1HG嘉泰姆

11HG嘉泰姆

31HG嘉泰姆

4.31HG嘉泰姆

141HG嘉泰姆

5001HG嘉泰姆

0.81HG嘉泰姆

551HG嘉泰姆

451HG嘉泰姆

5001HG嘉泰姆

CXSD62128B1HG嘉泰姆

TDFN3x3-101HG嘉泰姆

31HG嘉泰姆

2.61HG嘉泰姆

5.51HG嘉泰姆

20001HG嘉泰姆

0.81HG嘉泰姆

1101HG嘉泰姆

1101HG嘉泰姆

4601HG嘉泰姆

CXSD621291HG嘉泰姆

TDFN3x3-101HG嘉泰姆

CM1HG嘉泰姆

21HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

15001HG嘉泰姆

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2801HG嘉泰姆

2501HG嘉泰姆

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21HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

15001HG嘉泰姆

0.61HG嘉泰姆

2801HG嘉泰姆

2501HG嘉泰姆

CXSD621301HG嘉泰姆

TDFN2x2-61HG嘉泰姆

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11HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

15001HG嘉泰姆

0.61HG嘉泰姆

2801HG嘉泰姆

2501HG嘉泰姆

CXSD621311HG嘉泰姆

TDFN3x3-121HG嘉泰姆

CM1HG嘉泰姆

21HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

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2801HG嘉泰姆

2501HG嘉泰姆

251HG嘉泰姆

CXSD62131A1HG嘉泰姆

TDFN3x3-121HG嘉泰姆

CM1HG嘉泰姆

21HG嘉泰姆

11HG嘉泰姆

2.71HG嘉泰姆

61HG嘉泰姆

15001HG嘉泰姆

0.61HG嘉泰姆

2801HG嘉泰姆

2501HG嘉泰姆

CXSD62131C1HG嘉泰姆

TDFN 3x3 121HG嘉泰姆

CM1HG嘉泰姆

21HG嘉泰姆

11HG嘉泰姆

31HG嘉泰姆

5.51HG嘉泰姆

15001HG嘉泰姆

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2801HG嘉泰姆

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TQFN3x3-201HG嘉泰姆

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31HG嘉泰姆

21HG嘉泰姆

2.91HG嘉泰姆

5.51HG嘉泰姆

15001HG嘉泰姆

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-1HG嘉泰姆

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TDFN2x2-81HG嘉泰姆

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11HG嘉泰姆

11HG嘉泰姆

3.31HG嘉泰姆

81HG嘉泰姆

15001HG嘉泰姆

0.61HG嘉泰姆

2801HG嘉泰姆

2501HG嘉泰姆

251HG嘉泰姆

CXSD621341HG嘉泰姆

SOP-81HG嘉泰姆

CM1HG嘉泰姆

11HG嘉泰姆

21HG嘉泰姆

4.51HG嘉泰姆

241HG嘉泰姆

3401HG嘉泰姆

0.9251HG嘉泰姆

1101HG嘉泰姆

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CXSD621351HG嘉泰姆

SOP-8P1HG嘉泰姆