Details, datasheet, quote on part number: L6997
PartL6997
Category
DescriptionStep Down Controller For Low Voltage Operations
CompanyST Microelectronics, Inc.
DatasheetDownload L6997 datasheet
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Features, Applications

FEATURES s FROM TO 5.5V VCC RANGE. s MINIMUM OUTPUT VOLTAGE AS LOW TO 28V INPUT VOLTAGE RANGE. s CONSTANT ON TIME TOPOLOGY ALLOWS. OPERATION WITH VERYLOW AND HIGH DUTY CYCLES. s VERY FAST LOAD TRANSIENTS. 0.6V, 1% VREF. s SELECTABLE SINKING MODE. s LOSSLESS CURRENT LIMIT, AVAILABLE ALSO IN SINKING MODE s REMOTE SENSING. s OVP,UVP LATCHED PROTECTIONS. 600 A TYP QUIESCENT CURRENT. s POWER GOOD AND OVP SIGNALS. s PULSE SKIPPING AT LIGTH LOADS. s 94% EFFICIENCY FROM TO 2.5V. APPLICATIONS s NETWORKING. s DC/DC MODULES. s DISTRIBUTED POWER. s MOBILE APPLICATIONS. s CHIP SET, CPU, DSP AND MEMORIES SUPPLY. MINIMUM COMPONENT COUNT APPLICATION

DESCRIPTION The device is a high efficient solution for networking dc/dc modules and mobile application compatible with 3.3V bus and 5V bus. It's able to regulate an output voltage as low as 0.6V. The constant on time topology assures fast load transient response. The embedded voltage feed-forward provides nearly constant switching frequency operation. An integrator can be introduced in the control loop to reduce the static output voltage error. The remote sensing improves the static and dynamic regulation, recovering the wires voltage drop. Pulse skipping technique reduces power consumption at light loads. Drivers current capability allows output currents in excess of 20A.

Cin VCC VDR OSC BOOT HGATE HS Cboot L PHASE PGOOD OVP LGATE Ro2 Ro1 Cout Dboot

Symbol VCC VDR VCC to GND VDR to GND HGATE and BOOT, to PHASE HGATE and BOOT, to PGND VPHASE PHASE LGATE to PGND ILIM, VFB, VSENSE, NOSKIP, SHDN, PGOOD, OVP, VREF, INT, GNDSENSE to GND Ptot Tstg Power dissipation at Tamb = 25C Storage temperature range Parameter Value to 150 Unit C

Symbol Rth j-amb Tj Parameter Thermal Resistance Junction to Ambient Junction operating temperature range Value to 125 Unit C/W C

BOOT HGATE PHASE VDR LGATE PGND PGOOD OVP SHDN ILIM

N Name GNDSE NSE INT VSENS E VCC GND VREF Remote ground sensing pin Integrator output. Short this pin to VFB pin and connect it via a capacitor to VOUT to insert the integrator in the control loop. If the integrator is not used, short this pin to VREF. This pin must be connected to the remote output voltage to detect overvoltage and undervoltage conditions and to provide integrator feedback input. IC Supply Voltage. Signal ground 0.6V voltage reference. Connect max. a 10nF ceramic capacitor between this pin and ground. This pin is capable to source or sink to 250uA Description NOSKIP Connect to VCC to force continuous conduction mode and sink mode.

N Name VFB OSC SS ILIM SHDN OVP PGOOD PGND LGATE VDR PHASE HGATE BOOT Description PWM comparator feedback input. Short this pin to INT pin when using the integrator function, or to VSENSE pin without integrator. Connect this pin to the input voltage through a voltage divider in order to provide the feedforward function. It cannot be left floating. Soft start pin. A 5A constant current charges an external capacitor which value sets the softstart time. An external resistor connected between this pin and GND sets the current limit threshold. Shutdown. When connected to GND the device and the drivers are OFF. It cannot be left floating. Open drain output. During the over voltage condition it is pulled by an external resistor. Open drain output. During the soft start and in case of output voltage fault it is low. It is pulled up by external resistor. Low Side driver ground. Low Side driver output. Low Side driver supply. Return path of the High Side driver. High side MOSFETS driver output. Bootstrap capacitor pin. High Side driver is supplied through this pin.

ELECTRICAL CHARACTERISTICS (VCC = VDR = 3.3V; Tamb to 85C unless otherwise specified)

Symbol SUPPLY SECTION Vin VCC, VDR VCC Turn-onvoltage Turn-off voltage Hysteresis IqVDR IqVcc Quiescent Current Drivers Device Quiescent current VFB > VREF VFB > VREF Input voltage range Vout=Vref V 0.6 SHDN to GND SHDN to GND mV A Parameter Test Condition Min. Typ. Max. Unit

SHUTDOWN SECTION SHDN Device On Device Off ISHVDR ISHVCC Drivers shutdown current Devices shutdown current 1.2

SOFT START SECTION ISS Soft Start current Active Soft start and voltage CURRENT LIMIT AND ZERO CURRENT COMPARATOR ILIM input bias current Zero Crossing Comparator offset Phase-gnd DKILIM Current limit factor RILIM to 200K VSS = 0.4V


 

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