一,产品概述(General Description)         lv6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 arealv6嘉泰姆

Main Control Looplv6嘉泰姆

        The CXSD62159 is a constant frequency current mode switching regulator.lv6嘉泰姆
During normal operation, the internal N-channel power MOSFET is turned onlv6嘉泰姆
each cycle when the oscillator sets an internal RS latch and would be turnedlv6嘉泰姆
off when an internal current comparator (ICMP) resets the latch. The peaklv6嘉泰姆
inductor current at which ICMP resets the RS latch is controlled by the voltagelv6嘉泰姆
on the COMP pin, which is the output of the error amplifier (EAMP). An externallv6嘉泰姆
resistive divider connected between VOUT and ground allows the EAMP tolv6嘉泰姆
receive an output feedback voltage VFB at FB pin. When the load currentlv6嘉泰姆
increases, it causes a slight decrease in VFB relative to the 0.8V reference,lv6嘉泰姆
which in turn causes the COMP voltage to increase until the average inductorlv6嘉泰姆
current matches the new load current.lv6嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltageLockoutlv6嘉泰姆
The CXSD62159 keep monitoring the voltage on VIN pin to prevent wrong logiclv6嘉泰姆
operations which may occur when VIN voltage is not high enough for the internallv6嘉泰姆
control circuitry to operate. The VIN POR has a rising threshold of 4.05V (typical)lv6嘉泰姆
with 0.3V of hysteresis.An external under-voltage lockout (UVLO) is sensed atlv6嘉泰姆
the EN pin. The EN UVLO has a rising threshold of 2.5V with 0.2V of hysteresis.lv6嘉泰姆
The EN pin should be connected a resistor divider from VIN to EN .After the VINlv6嘉泰姆
and EN voltages exceed their respective voltage thresholds, the IC starts alv6嘉泰姆
start-up process and then ramps up the output voltage to the setting of outputlv6嘉泰姆
voltage.lv6嘉泰姆
Over-Temperature Protection (OTP)lv6嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62159lv6嘉泰姆
When the junction temperature exceeds TJ =+160oC, a thermal sensor turnslv6嘉泰姆
off the power MOSFET, allowing the device to cool down. The thermal sensorlv6嘉泰姆
allows the converter to start a start-up process and regulate the output voltagelv6嘉泰姆
again after the junction temperature cools by 50oC.The OTP designed with a 50 oClv6嘉泰姆
hysteresis lowers the average T J during c ontinuous thermal overload conditions,lv6嘉泰姆
increasing life time of the IC.lv6嘉泰姆
Enable/Shutdownlv6嘉泰姆
Driving EN to ground places the CXSD62159 in shutdown.When in shutdown, thelv6嘉泰姆
internal N-Channel power MOSFET turns off, all internal circuitry shuts down andlv6嘉泰姆
the quiescent supply current reduces to 0.3μA.lv6嘉泰姆
Current-Limit Protectionlv6嘉泰姆
The CXSD62159 monitors the output current, flowing through the N-Channel powerlv6嘉泰姆
MOSFET, and limits the IC from damages during overload, short-circuit and over-lv6嘉泰姆
voltage conditions. lv6嘉泰姆
Frequency Foldbacklv6嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltagelv6嘉泰姆
is under 0.6V, the frequency of the oscillator will be reduced to 110kHz. This lowerlv6嘉泰姆
frequency allows the inductor current to safely discharge,thereby preventing currentlv6嘉泰姆
runaway. The oscillator’s frequency will switch to its designed rate when the feedbacklv6嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.lv6嘉泰姆
Over-Voltage Protectionlv6嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltagelv6嘉泰姆
increase over 120% of the reference voltage, the over-voltage protection compara-lv6嘉泰姆
tor will force the high-and low-side MOSFET gate driver off. As soon as the outputlv6嘉泰姆
voltage is within regulation, the OVP comparator is disengaged. The chip will restore itslv6嘉泰姆
normal operation.lv6嘉泰姆
二.产品特点(Features)lv6嘉泰姆
Wide Input Voltage from 4.5V to 24Vlv6嘉泰姆
2A Continuous Output Currentlv6嘉泰姆
Adjustable Output Voltage from 0.8V to 20Vlv6嘉泰姆
Intergrated High/Low Side MOSFETlv6嘉泰姆
PFM/PWM mode Operationlv6嘉泰姆
Fixed 340kHz Switching Frequencylv6嘉泰姆
Stable with Low ESR Ceramic Output Capacitorslv6嘉泰姆
Power-On-Reset Detectionlv6嘉泰姆
Programmable Soft-Startlv6嘉泰姆
Over-Temperature Protectionlv6嘉泰姆
Current-Limit Protection with Frequency Foldbacklv6嘉泰姆
Enable/Shutdown Functionlv6嘉泰姆
Small TDFN3x3-10 Packageslv6嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)lv6嘉泰姆
三,应用范围 (Applications) lv6嘉泰姆

LCD Monitor/TVlv6嘉泰姆

Set-Top Boxlv6嘉泰姆
DSL, Switch HUBlv6嘉泰姆
Notebook Computerlv6嘉泰姆

四.下载产品资料PDF文档 lv6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！lv6嘉泰姆

 lv6嘉泰姆

 lv6嘉泰姆

五,产品封装图 (Package)lv6嘉泰姆

lv6嘉泰姆

六.电路原理图lv6嘉泰姆

lv6嘉泰姆

Switching Regulator > Buck Converterlv6嘉泰姆

 Part_No lv6嘉泰姆

 Packagelv6嘉泰姆

Architectulv6嘉泰姆

No.oflv6嘉泰姆

PWM lv6嘉泰姆

Outpulv6嘉泰姆

Drivelv6嘉泰姆

Loutlv6嘉泰姆

(A) lv6嘉泰姆

Vin(V) lv6嘉泰姆

Fmaxlv6嘉泰姆

Khz lv6嘉泰姆

Vref lv6嘉泰姆

(V) lv6嘉泰姆

R-Top (milohm) lv6嘉泰姆

R-Sync (milohm) lv6嘉泰姆

Iq (No load) (uA) lv6嘉泰姆

minlv6嘉泰姆

maxlv6嘉泰姆

CXSD62122lv6嘉泰姆

TQFN5x6-28lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

5lv6嘉泰姆

4.5lv6嘉泰姆

26lv6嘉泰姆

380lv6嘉泰姆

0.8lv6嘉泰姆

50lv6嘉泰姆

20lv6嘉泰姆

1000lv6嘉泰姆

CXSD62123lv6嘉泰姆

SOP-8lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

2lv6嘉泰姆

4.5lv6嘉泰姆

26lv6嘉泰姆

380lv6嘉泰姆

0.8lv6嘉泰姆

100lv6嘉泰姆

1000lv6嘉泰姆

CXSD62124lv6嘉泰姆

SOP-8Plv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

4lv6嘉泰姆

4.5lv6嘉泰姆

26lv6嘉泰姆

380lv6嘉泰姆

0.8lv6嘉泰姆

80lv6嘉泰姆

1000lv6嘉泰姆

CXSD62125lv6嘉泰姆

SOT23-5|TSOT23-5lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

25lv6嘉泰姆

CXSD62125Alv6嘉泰姆

SOT23-5lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

CXSD62126lv6嘉泰姆

SOP-8lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

3lv6嘉泰姆

4.3lv6嘉泰姆

14lv6嘉泰姆

500lv6嘉泰姆

0.8lv6嘉泰姆

70lv6嘉泰姆

70lv6嘉泰姆

500lv6嘉泰姆

CXSD62127lv6嘉泰姆

SOP-8Plv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

3lv6嘉泰姆

4.3lv6嘉泰姆

14lv6嘉泰姆

500lv6嘉泰姆

0.8lv6嘉泰姆

55lv6嘉泰姆

45lv6嘉泰姆

500lv6嘉泰姆

CXSD62128Blv6嘉泰姆

TDFN3x3-10lv6嘉泰姆

3lv6嘉泰姆

2.6lv6嘉泰姆

5.5lv6嘉泰姆

2000lv6嘉泰姆

0.8lv6嘉泰姆

110lv6嘉泰姆

110lv6嘉泰姆

460lv6嘉泰姆

CXSD62129lv6嘉泰姆

TDFN3x3-10lv6嘉泰姆

CMlv6嘉泰姆

2lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

500lv6嘉泰姆

CXSD62129Alv6嘉泰姆

TDFN3x3-10lv6嘉泰姆

CMlv6嘉泰姆

2lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

CXSD62130lv6嘉泰姆

TDFN2x2-6lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

25lv6嘉泰姆

CXSD62130Alv6嘉泰姆

TDFN2x2-6lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

CXSD62131lv6嘉泰姆

TDFN3x3-12lv6嘉泰姆

CMlv6嘉泰姆

2lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

25lv6嘉泰姆

CXSD62131Alv6嘉泰姆

TDFN3x3-12lv6嘉泰姆

CMlv6嘉泰姆

2lv6嘉泰姆

1lv6嘉泰姆

2.7lv6嘉泰姆

6lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

CXSD62131Clv6嘉泰姆

TDFN 3x3 12lv6嘉泰姆

CMlv6嘉泰姆

2lv6嘉泰姆

1lv6嘉泰姆

3lv6嘉泰姆

5.5lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

30lv6嘉泰姆

CXSD62132lv6嘉泰姆

TQFN3x3-20lv6嘉泰姆

CMlv6嘉泰姆

3lv6嘉泰姆

2lv6嘉泰姆

2.9lv6嘉泰姆

5.5lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

-lv6嘉泰姆

-lv6嘉泰姆

300lv6嘉泰姆

CXSD62133lv6嘉泰姆

TDFN2x2-8lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

1lv6嘉泰姆

3.3lv6嘉泰姆

8lv6嘉泰姆

1500lv6嘉泰姆

0.6lv6嘉泰姆

280lv6嘉泰姆

250lv6嘉泰姆

25lv6嘉泰姆

CXSD62134lv6嘉泰姆

SOP-8lv6嘉泰姆

CMlv6嘉泰姆

1lv6嘉泰姆

2lv6嘉泰姆

4.5lv6嘉泰姆

24lv6嘉泰姆

340lv6嘉泰姆

0.925lv6嘉泰姆

110lv6嘉泰姆

110lv6嘉泰姆

1900lv6嘉泰姆

CXSD62135lv6嘉泰姆

SOP-8Plv6嘉泰姆