一,产品概述(General Description)         KfV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 areaKfV嘉泰姆

Main Control LoopKfV嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.KfV嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onKfV嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedKfV嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakKfV嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltageKfV嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externalKfV嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP toKfV嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentKfV嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,KfV嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorKfV嘉泰姆
current matches the new load current.KfV嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutKfV嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicKfV嘉泰姆
operations which may occur when VIN voltage is not high enough for the internalKfV嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)KfV嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atKfV嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.KfV嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINKfV嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts aKfV嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputKfV嘉泰姆
voltage.KfV嘉泰姆
Over-Temperature Protection (OTP)KfV嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159KfV嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsKfV嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorKfV嘉泰姆
allows the converter to start a start-up process and regulate the output voltageKfV嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCKfV嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,KfV嘉泰姆
increasing life time of the IC.KfV嘉泰姆
Enable/ShutdownKfV嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, theKfV嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andKfV嘉泰姆
the quiescent supply current reduces to 0.3μA.KfV嘉泰姆
Current-Limit ProtectionKfV嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerKfV嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-KfV嘉泰姆
voltage conditions. KfV嘉泰姆
Frequency FoldbackKfV嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltageKfV嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerKfV嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentKfV嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackKfV嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.KfV嘉泰姆
Over-Voltage ProtectionKfV嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltageKfV嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-KfV嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputKfV嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsKfV嘉泰姆
normal operation.KfV嘉泰姆
二.产品特点(Features)KfV嘉泰姆
Wide Input Voltage from 4.5V to 24VKfV嘉泰姆
2A Continuous Output CurrentKfV嘉泰姆
Adjustable Output Voltage from 0.8V to 20VKfV嘉泰姆
Intergrated High/Low Side MOSFETKfV嘉泰姆
PFM/PWM mode OperationKfV嘉泰姆
Fixed 340kHz Switching FrequencyKfV嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsKfV嘉泰姆
Power-On-Reset DetectionKfV嘉泰姆
Programmable Soft-StartKfV嘉泰姆
Over-Temperature ProtectionKfV嘉泰姆
Current-Limit Protection with Frequency FoldbackKfV嘉泰姆
Enable/Shutdown FunctionKfV嘉泰姆
Small TDFN3x3-10 PackagesKfV嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)KfV嘉泰姆
三,应用范围 (Applications) KfV嘉泰姆

LCD Monitor/TVKfV嘉泰姆

Set-Top BoxKfV嘉泰姆
DSL, Switch HUBKfV嘉泰姆
Notebook ComputerKfV嘉泰姆

四.下载产品资料PDF文档 KfV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！KfV嘉泰姆

 KfV嘉泰姆

 KfV嘉泰姆

五,产品封装图 (Package)KfV嘉泰姆

KfV嘉泰姆

六.电路原理图KfV嘉泰姆

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Switching Regulator > Buck ConverterKfV嘉泰姆

 Part_No KfV嘉泰姆

 PackageKfV嘉泰姆

ArchitectuKfV嘉泰姆

No.ofKfV嘉泰姆

PWM KfV嘉泰姆

OutpuKfV嘉泰姆

DriveKfV嘉泰姆

LoutKfV嘉泰姆

(A) KfV嘉泰姆

Vin(V) KfV嘉泰姆

FmaxKfV嘉泰姆

Khz KfV嘉泰姆

Vref KfV嘉泰姆

(V) KfV嘉泰姆

R-Top (milohm) KfV嘉泰姆

R-Sync (milohm) KfV嘉泰姆

Iq (No load) (uA) KfV嘉泰姆

minKfV嘉泰姆

maxKfV嘉泰姆

CXSD62122KfV嘉泰姆

TQFN5x6-28KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

5KfV嘉泰姆

4.5KfV嘉泰姆

26KfV嘉泰姆

380KfV嘉泰姆

0.8KfV嘉泰姆

50KfV嘉泰姆

20KfV嘉泰姆

1000KfV嘉泰姆

CXSD62123KfV嘉泰姆

SOP-8KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

2KfV嘉泰姆

4.5KfV嘉泰姆

26KfV嘉泰姆

380KfV嘉泰姆

0.8KfV嘉泰姆

100KfV嘉泰姆

1000KfV嘉泰姆

CXSD62124KfV嘉泰姆

SOP-8PKfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

4KfV嘉泰姆

4.5KfV嘉泰姆

26KfV嘉泰姆

380KfV嘉泰姆

0.8KfV嘉泰姆

80KfV嘉泰姆

1000KfV嘉泰姆

CXSD62125KfV嘉泰姆

SOT23-5|TSOT23-5KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

25KfV嘉泰姆

CXSD62125AKfV嘉泰姆

SOT23-5KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

CXSD62126KfV嘉泰姆

SOP-8KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

3KfV嘉泰姆

4.3KfV嘉泰姆

14KfV嘉泰姆

500KfV嘉泰姆

0.8KfV嘉泰姆

70KfV嘉泰姆

70KfV嘉泰姆

500KfV嘉泰姆

CXSD62127KfV嘉泰姆

SOP-8PKfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

3KfV嘉泰姆

4.3KfV嘉泰姆

14KfV嘉泰姆

500KfV嘉泰姆

0.8KfV嘉泰姆

55KfV嘉泰姆

45KfV嘉泰姆

500KfV嘉泰姆

CXSD62128BKfV嘉泰姆

TDFN3x3-10KfV嘉泰姆

3KfV嘉泰姆

2.6KfV嘉泰姆

5.5KfV嘉泰姆

2000KfV嘉泰姆

0.8KfV嘉泰姆

110KfV嘉泰姆

110KfV嘉泰姆

460KfV嘉泰姆

CXSD62129KfV嘉泰姆

TDFN3x3-10KfV嘉泰姆

CMKfV嘉泰姆

2KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

500KfV嘉泰姆

CXSD62129AKfV嘉泰姆

TDFN3x3-10KfV嘉泰姆

CMKfV嘉泰姆

2KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

CXSD62130KfV嘉泰姆

TDFN2x2-6KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

25KfV嘉泰姆

CXSD62130AKfV嘉泰姆

TDFN2x2-6KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

CXSD62131KfV嘉泰姆

TDFN3x3-12KfV嘉泰姆

CMKfV嘉泰姆

2KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

25KfV嘉泰姆

CXSD62131AKfV嘉泰姆

TDFN3x3-12KfV嘉泰姆

CMKfV嘉泰姆

2KfV嘉泰姆

1KfV嘉泰姆

2.7KfV嘉泰姆

6KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

CXSD62131CKfV嘉泰姆

TDFN 3x3 12KfV嘉泰姆

CMKfV嘉泰姆

2KfV嘉泰姆

1KfV嘉泰姆

3KfV嘉泰姆

5.5KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

30KfV嘉泰姆

CXSD62132KfV嘉泰姆

TQFN3x3-20KfV嘉泰姆

CMKfV嘉泰姆

3KfV嘉泰姆

2KfV嘉泰姆

2.9KfV嘉泰姆

5.5KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

-KfV嘉泰姆

-KfV嘉泰姆

300KfV嘉泰姆

CXSD62133KfV嘉泰姆

TDFN2x2-8KfV嘉泰姆

CMKfV嘉泰姆

1KfV嘉泰姆

1KfV嘉泰姆

3.3KfV嘉泰姆

8KfV嘉泰姆

1500KfV嘉泰姆

0.6KfV嘉泰姆

280KfV嘉泰姆

250KfV嘉泰姆

25KfV嘉泰姆

CXSD62134KfV嘉泰姆

SOP-8KfV嘉泰姆

CMKfV嘉泰姆

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4.5KfV嘉泰姆

24KfV嘉泰姆

340KfV嘉泰姆

0.925KfV嘉泰姆

110KfV嘉泰姆

110KfV嘉泰姆

1900KfV嘉泰姆

CXSD62135KfV嘉泰姆

SOP-8PKfV嘉泰姆