目录W1g嘉泰姆

1.产品概述                       2.产品特点W1g嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 W1g嘉泰姆
5.产品封装图                     6.电路原理图                   W1g嘉泰姆
7.功能概述                        8.相关产品W1g嘉泰姆

一,产品概述(General Description)         W1g嘉泰姆

       The CXSD6292 is a single-phase, constant-on-time, and synchronousW1g嘉泰姆
PWM controller which drives N-channel MOSFETs. The CXSD6292 stepsW1g嘉泰姆
down high voltage of a battery to generate low-voltage chipset or RAM suppliesW1g嘉泰姆
in notebook computers.W1g嘉泰姆
        The CXSD6292 provides excellent transient response and accurate DCW1g嘉泰姆
voltage output in either PFM or PWM Mode.In Pulse Frequency ModulationW1g嘉泰姆
(PFM) Mode, the CXSD6292 provides very high efficiency over light loadW1g嘉泰姆
with loading-modulated switching frequencies. When the inductor currentW1g嘉泰姆
is continuous, the operation automatically enters PWM mode with relativelyW1g嘉泰姆
constant switching frequency.For QFN4x4-16A and TQFN3x3-16 packages,W1g嘉泰姆
the Forced-PWM Mode works nearly at constant frequency for low-noiseW1g嘉泰姆
requirements.W1g嘉泰姆
         The CXSD6292 is equipped with accurate over-current,output under-W1g嘉泰姆
voltage, and over-voltage protections per-fect for NB application. A Power-W1g嘉泰姆
On-Reset function moni-tors the voltage on VCC pin to prevent errorneousW1g嘉泰姆
opera-tion during power-on. The CXSD6292 has a digital soft-start and soft-stop.W1g嘉泰姆
The internal integrated soft-start ramps up the output voltage with controlled slewW1g嘉泰姆
rate to reduce the start-up current. The digital soft-stop function actively dischargesW1g嘉泰姆
the output capacitors with controlled reverse inductor current.W1g嘉泰姆
     The CXSD6292 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packagesW1g嘉泰姆
二.产品特点(Features)W1g嘉泰姆

1.)Adjustable Output Voltage from +0.6V to +3.3VW1g嘉泰姆
    - 0.6V Reference VoltageW1g嘉泰姆
    - ±1% Accuracy Over TemperatureW1g嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25VW1g嘉泰姆
3.)Wide Output Load Range from 0A to 25AW1g嘉泰姆
4.)Power-On-Reset Monitoring on VCC PinW1g嘉泰姆
5.)Excellent Line and Load Transient ResponseW1g嘉泰姆
6.)PFM Mode for Increased Light Load EfficiencyW1g嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHzW1g嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap DiodeW1g嘉泰姆
9.)Internal Integrated Soft-Start and Soft-StopW1g嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWMW1g嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)W1g嘉泰姆
      Power Good MonitoringW1g嘉泰姆
12.)Fault Identification by PGOOD Pull-Down ResistanceW1g嘉泰姆
13.)70% Under-Voltage Protection (UVP)W1g嘉泰姆
14.)124% Over-Voltage Protection (OVP)W1g嘉泰姆
15.)Adjustable Over-Current Protection (OCP)W1g嘉泰姆
      - Sensing Low-Side MOSFET’s CurrentW1g嘉泰姆
16.)Over-Temperature Protection (OTP)W1g嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-W1g嘉泰姆
     16A), and TQFN3x3-16 PackagesW1g嘉泰姆
18.)Lead Free and Green Devices AvailableW1g嘉泰姆
三,应用范围 (Applications)W1g嘉泰姆

PCI Express Graphical Processing UnitW1g嘉泰姆
Notebook AdapterW1g嘉泰姆
Auxiliary Power RailW1g嘉泰姆
VRMW1g嘉泰姆
四.下载产品资料PDF文档 W1g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！W1g嘉泰姆

 W1g嘉泰姆

五,产品封装图 (Package)W1g嘉泰姆

W1g嘉泰姆

六.电路原理图W1g嘉泰姆

W1g嘉泰姆
七,功能概述W1g嘉泰姆

Power Good IndicatorW1g嘉泰姆
The CXSD6292 features an open-drain PGOOD output pin to indicate one of the IC’s working statuses W1g嘉泰姆

including soft-start, under-voltage fault, over-current fault, and over-voltage faule. The unique fault-W1g嘉泰姆

identification capability can drastically reduce trouble-shooting time and effort.W1g嘉泰姆
The pull-down resistance of the PGOOD pin correspondsto the fault status of the controller. During W1g嘉泰姆

soft-start or if an under voltage fault occurs, the PGOOD pull-down re-sistance is 95Ω, or 32Ω for W1g嘉泰姆

an over current fault, or 63Ω for an over voltage fault. The pull-low resistance is unde-fined if VCC W1g嘉泰姆

is below the rising/falling POR threshold.W1g嘉泰姆
Over-Temperature Protection (OTP)W1g嘉泰姆
When the junction temperature increases above the ris-ing threshold temperature TOTR, the IC W1g嘉泰姆

will enter the over-temperature protection (OTP) state that suspends the PWM, which forces the W1g嘉泰姆

LG and UG gate drivers to output low voltages. The status of the PGOOD pin does not change, norW1g嘉泰姆

 does the converter latch-off. The thermal sensor allows the converters to start a start-up process W1g嘉泰姆

and regulate the output voltage again after the junction temperature cools by 25oC. The OTP is W1g嘉泰姆

designed with a 25oC hysteresis to lower the average TJ during continu-ous thermal overload W1g嘉泰姆

conditions, which increases life- time of the CXSD6292.W1g嘉泰姆

Over-Current Protection (OCP) and Short-Circuit Pro-tection (SCP)W1g嘉泰姆
The over-current protection (OCP) is designed to resist the slow slew rate load current; on the otherW1g嘉泰姆

 hand, the short-circuit protection (SCP) is used to take care of rapid shorted output. The setpoint forW1g嘉泰姆

 OCP and SCP is pro-grammed with resistor RSEN that is connected across the ISEN pin and drain ofW1g嘉泰姆

 the low-side MOSFET. The SCP setpoint is internally set to twice the OCP setpoint.W1g嘉泰姆
The inductor current develops a negative voltage across the RDS(ON) of the low-side MOSFET that isW1g嘉泰姆

 sampled and held shortly before LG gate-driver output goes low. The OCP fault occurs if ISEN rises W1g嘉泰姆

above the OCP threshold current IOC (typical :26μA) while attempting to null the nega-tive voltage W1g嘉泰姆

across the PHASE and GND pins. When the ISEN exceeds IOC, the OCP counter starts to work.W1g嘉泰姆
Meanwhile, pulses on all the PWM (ISEN > IOC) remains for 20μs, the OCP will be triggered. When W1g嘉泰姆

ISEN falls below IOC on a PWM pulses before 20μs has elapsed, the counter will be reset. The SCPW1g嘉泰姆

 fault will occur within 10μs when I SEN exceeds twice I OC. The relationship between the sampled W1g嘉泰姆

current and MOSFET current is given by:W1g嘉泰姆
ISEN × RSEN = RDS ( ON ) × ILW1g嘉泰姆
Which means the current sensing pin will source current to make the voltage drop on the MOSFET W1g嘉泰姆

and is equal to the voltage generated on the sensing resistor along the ISEN pin current flowing path.W1g嘉泰姆
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