一,产品概述(General Description)         UMa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 areaUMa嘉泰姆

Main Control LoopUMa嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.UMa嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onUMa嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedUMa嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peakUMa嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltageUMa嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externalUMa嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP toUMa嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentUMa嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,UMa嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorUMa嘉泰姆
current matches the new load current.UMa嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutUMa嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logicUMa嘉泰姆
operations which may occur when VIN voltage is not high enough for the internalUMa嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)UMa嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atUMa嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.UMa嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINUMa嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts aUMa嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputUMa嘉泰姆
voltage.UMa嘉泰姆
Over-Temperature Protection (OTP)UMa嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159UMa嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnsUMa嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorUMa嘉泰姆
allows the converter to start a start-up process and regulate the output voltageUMa嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oCUMa嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,UMa嘉泰姆
increasing life time of the IC.UMa嘉泰姆
Enable/ShutdownUMa嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, theUMa嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andUMa嘉泰姆
the quiescent supply current reduces to 0.3μA.UMa嘉泰姆
Current-Limit ProtectionUMa嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerUMa嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-UMa嘉泰姆
voltage conditions. UMa嘉泰姆
Frequency FoldbackUMa嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltageUMa嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerUMa嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentUMa嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbackUMa嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.UMa嘉泰姆
Over-Voltage ProtectionUMa嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltageUMa嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-UMa嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputUMa嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsUMa嘉泰姆
normal operation.UMa嘉泰姆
二.产品特点(Features)UMa嘉泰姆
Wide Input Voltage from 4.5V to 24VUMa嘉泰姆
2A Continuous Output CurrentUMa嘉泰姆
Adjustable Output Voltage from 0.8V to 20VUMa嘉泰姆
Intergrated High/Low Side MOSFETUMa嘉泰姆
PFM/PWM mode OperationUMa嘉泰姆
Fixed 340kHz Switching FrequencyUMa嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsUMa嘉泰姆
Power-On-Reset DetectionUMa嘉泰姆
Programmable Soft-StartUMa嘉泰姆
Over-Temperature ProtectionUMa嘉泰姆
Current-Limit Protection with Frequency FoldbackUMa嘉泰姆
Enable/Shutdown FunctionUMa嘉泰姆
Small TDFN3x3-10 PackagesUMa嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)UMa嘉泰姆
三,应用范围 (Applications) UMa嘉泰姆

LCD Monitor/TVUMa嘉泰姆

Set-Top BoxUMa嘉泰姆
DSL, Switch HUBUMa嘉泰姆
Notebook ComputerUMa嘉泰姆

四.下载产品资料PDF文档 UMa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！UMa嘉泰姆

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五,产品封装图 (Package)UMa嘉泰姆

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六.电路原理图UMa嘉泰姆

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Switching Regulator > Buck ConverterUMa嘉泰姆

 Part_No UMa嘉泰姆

 PackageUMa嘉泰姆

ArchitectuUMa嘉泰姆

No.ofUMa嘉泰姆

PWM UMa嘉泰姆

OutpuUMa嘉泰姆

DriveUMa嘉泰姆

LoutUMa嘉泰姆

(A) UMa嘉泰姆

Vin(V) UMa嘉泰姆

FmaxUMa嘉泰姆

Khz UMa嘉泰姆

Vref UMa嘉泰姆

(V) UMa嘉泰姆

R-Top (milohm) UMa嘉泰姆

R-Sync (milohm) UMa嘉泰姆

Iq (No load) (uA) UMa嘉泰姆

minUMa嘉泰姆

maxUMa嘉泰姆

CXSD62122UMa嘉泰姆

TQFN5x6-28UMa嘉泰姆

CMUMa嘉泰姆

1UMa嘉泰姆

5UMa嘉泰姆

4.5UMa嘉泰姆

26UMa嘉泰姆

380UMa嘉泰姆

0.8UMa嘉泰姆

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20UMa嘉泰姆

1000UMa嘉泰姆

CXSD62123UMa嘉泰姆

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26UMa嘉泰姆

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CXSD62124UMa嘉泰姆

SOP-8PUMa嘉泰姆

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26UMa嘉泰姆

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1000UMa嘉泰姆

CXSD62125UMa嘉泰姆

SOT23-5|TSOT23-5UMa嘉泰姆

CMUMa嘉泰姆

1UMa嘉泰姆

1UMa嘉泰姆

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6UMa嘉泰姆

1500UMa嘉泰姆

0.6UMa嘉泰姆

280UMa嘉泰姆

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CXSD62125AUMa嘉泰姆

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6UMa嘉泰姆

1500UMa嘉泰姆

0.6UMa嘉泰姆

280UMa嘉泰姆

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CXSD62126UMa嘉泰姆

SOP-8UMa嘉泰姆

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1UMa嘉泰姆

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14UMa嘉泰姆

500UMa嘉泰姆

0.8UMa嘉泰姆

70UMa嘉泰姆

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500UMa嘉泰姆

CXSD62127UMa嘉泰姆

SOP-8PUMa嘉泰姆

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55UMa嘉泰姆

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CXSD62128BUMa嘉泰姆

TDFN3x3-10UMa嘉泰姆

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2000UMa嘉泰姆

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110UMa嘉泰姆

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460UMa嘉泰姆

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TDFN2x2-6UMa嘉泰姆

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6UMa嘉泰姆

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280UMa嘉泰姆

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TDFN 3x3 12UMa嘉泰姆

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