一,产品概述(General Description)         622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 area622嘉泰姆

Main Control Loop622嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.622嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned on622嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turned622嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peak622嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltage622嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An external622嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP to622嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load current622嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,622嘉泰姆
which in turn causes the COMP voltage to increase until the average inductor622嘉泰姆
current matches the new load current.622嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockout622嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logic622嘉泰姆
operations which may occur when VIN voltage is not high enough for the internal622嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)622嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed at622嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.622嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VIN622嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts a622嘉泰姆
start-up process and then ramps up the output voltage to the setting of output622嘉泰姆
voltage.622嘉泰姆
Over-Temperature Protection (OTP)622嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159622嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turns622嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensor622嘉泰姆
allows the converter to start a start-up process and regulate the output voltage622嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oC622嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,622嘉泰姆
increasing life time of the IC.622嘉泰姆
Enable/Shutdown622嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, the622嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down and622嘉泰姆
the quiescent supply current reduces to 0.3μA.622嘉泰姆
Current-Limit Protection622嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel power622嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-622嘉泰姆
voltage conditions. 622嘉泰姆
Frequency Foldback622嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage622嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lower622嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing current622嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedback622嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.622嘉泰姆
Over-Voltage Protection622嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage622嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-622嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the output622嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore its622嘉泰姆
normal operation.622嘉泰姆
二.产品特点(Features)622嘉泰姆
Wide Input Voltage from 4.5V to 24V622嘉泰姆
2A Continuous Output Current622嘉泰姆
Adjustable Output Voltage from 0.8V to 20V622嘉泰姆
Intergrated High/Low Side MOSFET622嘉泰姆
PFM/PWM mode Operation622嘉泰姆
Fixed 340kHz Switching Frequency622嘉泰姆
Stable with Low ESR Ceramic Output Capacitors622嘉泰姆
Power-On-Reset Detection622嘉泰姆
Programmable Soft-Start622嘉泰姆
Over-Temperature Protection622嘉泰姆
Current-Limit Protection with Frequency Foldback622嘉泰姆
Enable/Shutdown Function622嘉泰姆
Small TDFN3x3-10 Packages622嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)622嘉泰姆
三,应用范围 (Applications) 622嘉泰姆

LCD Monitor/TV622嘉泰姆

Set-Top Box622嘉泰姆
DSL, Switch HUB622嘉泰姆
Notebook Computer622嘉泰姆

四.下载产品资料PDF文档 622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！622嘉泰姆

 622嘉泰姆

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五,产品封装图 (Package)622嘉泰姆

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六.电路原理图622嘉泰姆

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Switching Regulator > Buck Converter622嘉泰姆

 Part_No 622嘉泰姆

 Package622嘉泰姆

Architectu622嘉泰姆

No.of622嘉泰姆

PWM 622嘉泰姆

Outpu622嘉泰姆

Drive622嘉泰姆

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(A) 622嘉泰姆

Vin(V) 622嘉泰姆

Fmax622嘉泰姆

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R-Top (milohm) 622嘉泰姆

R-Sync (milohm) 622嘉泰姆

Iq (No load) (uA) 622嘉泰姆

min622嘉泰姆

max622嘉泰姆

CXSD62122622嘉泰姆

TQFN5x6-28622嘉泰姆

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CXSD62128B622嘉泰姆

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TDFN3x3-12622嘉泰姆

CM622嘉泰姆

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TDFN 3x3 12622嘉泰姆

CM622嘉泰姆

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SOP-8P622嘉泰姆