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L6997DTR Scheda tecnica(PDF) 1 Page - STMicroelectronics

Il numero della parte L6997DTR
Spiegazioni elettronici  STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6997DTR Scheda tecnica(HTML) 1 Page - STMicroelectronics

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L6997
April 2003
FEATURES
s
FROM 3V TO 5.5V VCC RANGE.
s
MINIMUM OUTPUT VOLTAGE AS LOW AS
0.6V.
s
1V TO 28V INPUT VOLTAGE RANGE.
s
CONSTANT ON TIME TOPOLOGY ALLOWS.
OPERATION WITH VERYLOW AND HIGH
DUTY CYCLES.
s
VERY FAST LOAD TRANSIENTS.
s
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.
s
600
µA TYP QUIESCENT CURRENT.
s
POWER GOOD AND OVP SIGNALS.
s
PULSE SKIPPING AT LIGTH LOADS.
s
94% EFFICIENCY FROM 3.3V TO 2.5V.
APPLICATIONS
s
NETWORKING.
s
DC/DC MODULES.
s
DISTRIBUTED POWER.
s
MOBILE APPLICATIONS.
s
CHIP SET, CPU, DSP AND MEMORIES SUPPLY.
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 tran-
sient response. The embedded voltage feed-forward
provides nearly constant switching frequency opera-
tion.
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 consump-
tion at light loads. Drivers current capability allows
output currents in excess of 20A.
TSSOP20
ORDERING NUMBERS: L6997D
L6997DTR
STEP DOWN CONTROLLER
FOR LOW VOLTAGE OPERATIONS
MINIMUM COMPONENT COUNT APPLICATION
L6997
SHDN
3.3V
INT
VSENSE
OVP
Vref
GND
GNDSENSE
VFB
SS
OSC
0.6V
PGOOD
PGND
LGATE
PHASE
HGATE
ILIM
BOOT
Rilim
Css
Cvref
HS
LS
Rin1
Rin2
Cin
Cboot
Dboot
L
Cout
Ro1
Ro2
DS


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