目录D68嘉泰姆

1.产品概述                       2.产品特点D68嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 D68嘉泰姆
5.产品封装图                     6.电路原理图                   D68嘉泰姆
7.功能概述                        8.相关产品D68嘉泰姆

一,产品概述(General Description)         D68嘉泰姆

       The CXSD6292 is a single-phase, constant-on-time, and synchronousD68嘉泰姆
PWM controller which drives N-channel MOSFETs. The CXSD6292 stepsD68嘉泰姆
down high voltage of a battery to generate low-voltage chipset or RAM suppliesD68嘉泰姆
in notebook computers.D68嘉泰姆
        The CXSD6292 provides excellent transient response and accurate DCD68嘉泰姆
voltage output in either PFM or PWM Mode.In Pulse Frequency ModulationD68嘉泰姆
(PFM) Mode, the CXSD6292 provides very high efficiency over light loadD68嘉泰姆
with loading-modulated switching frequencies. When the inductor currentD68嘉泰姆
is continuous, the operation automatically enters PWM mode with relativelyD68嘉泰姆
constant switching frequency.For QFN4x4-16A and TQFN3x3-16 packages,D68嘉泰姆
the Forced-PWM Mode works nearly at constant frequency for low-noiseD68嘉泰姆
requirements.D68嘉泰姆
         The CXSD6292 is equipped with accurate over-current,output under-D68嘉泰姆
voltage, and over-voltage protections per-fect for NB application. A Power-D68嘉泰姆
On-Reset function moni-tors the voltage on VCC pin to prevent errorneousD68嘉泰姆
opera-tion during power-on. The CXSD6292 has a digital soft-start and soft-stop.D68嘉泰姆
The internal integrated soft-start ramps up the output voltage with controlled slewD68嘉泰姆
rate to reduce the start-up current. The digital soft-stop function actively dischargesD68嘉泰姆
the output capacitors with controlled reverse inductor current.D68嘉泰姆
     The CXSD6292 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packagesD68嘉泰姆
二.产品特点(Features)D68嘉泰姆

1.)Adjustable Output Voltage from +0.6V to +3.3VD68嘉泰姆
    - 0.6V Reference VoltageD68嘉泰姆
    - ±1% Accuracy Over TemperatureD68嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25VD68嘉泰姆
3.)Wide Output Load Range from 0A to 25AD68嘉泰姆
4.)Power-On-Reset Monitoring on VCC PinD68嘉泰姆
5.)Excellent Line and Load Transient ResponseD68嘉泰姆
6.)PFM Mode for Increased Light Load EfficiencyD68嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHzD68嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap DiodeD68嘉泰姆
9.)Internal Integrated Soft-Start and Soft-StopD68嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWMD68嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)D68嘉泰姆
      Power Good MonitoringD68嘉泰姆
12.)Fault Identification by PGOOD Pull-Down ResistanceD68嘉泰姆
13.)70% Under-Voltage Protection (UVP)D68嘉泰姆
14.)124% Over-Voltage Protection (OVP)D68嘉泰姆
15.)Adjustable Over-Current Protection (OCP)D68嘉泰姆
      - Sensing Low-Side MOSFET’s CurrentD68嘉泰姆
16.)Over-Temperature Protection (OTP)D68嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-D68嘉泰姆
     16A), and TQFN3x3-16 PackagesD68嘉泰姆
18.)Lead Free and Green Devices AvailableD68嘉泰姆
三,应用范围 (Applications)D68嘉泰姆

PCI Express Graphical Processing UnitD68嘉泰姆
Notebook AdapterD68嘉泰姆
Auxiliary Power RailD68嘉泰姆
VRMD68嘉泰姆
四.下载产品资料PDF文档 D68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！D68嘉泰姆

 D68嘉泰姆

五,产品封装图 (Package)D68嘉泰姆

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六.电路原理图D68嘉泰姆

D68嘉泰姆
七,功能概述D68嘉泰姆

Power Good IndicatorD68嘉泰姆
The CXSD6292 features an open-drain PGOOD output pin to indicate one of the IC’s working statuses D68嘉泰姆

including soft-start, under-voltage fault, over-current fault, and over-voltage faule. The unique fault-D68嘉泰姆

identification capability can drastically reduce trouble-shooting time and effort.D68嘉泰姆
The pull-down resistance of the PGOOD pin correspondsto the fault status of the controller. During D68嘉泰姆

soft-start or if an under voltage fault occurs, the PGOOD pull-down re-sistance is 95Ω, or 32Ω for D68嘉泰姆

an over current fault, or 63Ω for an over voltage fault. The pull-low resistance is unde-fined if VCC D68嘉泰姆

is below the rising/falling POR threshold.D68嘉泰姆
Over-Temperature Protection (OTP)D68嘉泰姆
When the junction temperature increases above the ris-ing threshold temperature TOTR, the IC D68嘉泰姆

will enter the over-temperature protection (OTP) state that suspends the PWM, which forces the D68嘉泰姆

LG and UG gate drivers to output low voltages. The status of the PGOOD pin does not change, norD68嘉泰姆

 does the converter latch-off. The thermal sensor allows the converters to start a start-up process D68嘉泰姆

and regulate the output voltage again after the junction temperature cools by 25oC. The OTP is D68嘉泰姆

designed with a 25oC hysteresis to lower the average TJ during continu-ous thermal overload D68嘉泰姆

conditions, which increases life- time of the CXSD6292.D68嘉泰姆

Over-Current Protection (OCP) and Short-Circuit Pro-tection (SCP)D68嘉泰姆
The over-current protection (OCP) is designed to resist the slow slew rate load current; on the otherD68嘉泰姆

 hand, the short-circuit protection (SCP) is used to take care of rapid shorted output. The setpoint forD68嘉泰姆

 OCP and SCP is pro-grammed with resistor RSEN that is connected across the ISEN pin and drain ofD68嘉泰姆

 the low-side MOSFET. The SCP setpoint is internally set to twice the OCP setpoint.D68嘉泰姆
The inductor current develops a negative voltage across the RDS(ON) of the low-side MOSFET that isD68嘉泰姆

 sampled and held shortly before LG gate-driver output goes low. The OCP fault occurs if ISEN rises D68嘉泰姆

above the OCP threshold current IOC (typical :26μA) while attempting to null the nega-tive voltage D68嘉泰姆

across the PHASE and GND pins. When the ISEN exceeds IOC, the OCP counter starts to work.D68嘉泰姆
Meanwhile, pulses on all the PWM (ISEN > IOC) remains for 20μs, the OCP will be triggered. When D68嘉泰姆

ISEN falls below IOC on a PWM pulses before 20μs has elapsed, the counter will be reset. The SCPD68嘉泰姆

 fault will occur within 10μs when I SEN exceeds twice I OC. The relationship between the sampled D68嘉泰姆

current and MOSFET current is given by:D68嘉泰姆
ISEN × RSEN = RDS ( ON ) × ILD68嘉泰姆
Which means the current sensing pin will source current to make the voltage drop on the MOSFET D68嘉泰姆

and is equal to the voltage generated on the sensing resistor along the ISEN pin current flowing path.D68嘉泰姆
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