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L6997STR Scheda tecnica(PDF) 1 Page - STMicroelectronics

Il numero della parte L6997STR
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

L6997STR Scheda tecnica(HTML) 1 Page - STMicroelectronics

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L6997S
June 2004
1
Features
FROM 3V TO 5.5V VCC RANGE
MINIMUM OUTPUT VOLTAGE AS LOW AS
0.6V
1V TO 35V INPUT VOLTAGE RANGE
CONSTANT ON TIME TOPOLOGY
VERY FAST LOAD TRANSIENTS
0.6V, ±1% VREF
SELECTABLE SINKING MODE
LOSSLESS CURRENT LIMIT, AVAILABLE
ALSO IN SINKING MODE
REMOTE SENSING
OVP,UVP LATCHED PROTECTIONS
600
µA TYP QUIESCENT CURRENT
POWER GOOD AND OVP SIGNALS
PULSE SKIPPING AT LIGTH LOADS
94% EFFICIENCY FROM 3.3V TO 2.5V
2
Applications
NETWORKING
DC/DC MODULES
DISTRIBUTED POWER
MOBILE APPLICATIONS
CHIP SET, CPU, DSP AND MEMORIES
SUPPLY
3
Description
The device is a high efficient solution for networking
dc/dc modules and mobile applications 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 in spite of a wide input voltage range.
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.
STEP DOWN CONTROLLER
FOR LOW VOLTAGE OPERATIONS
Figure 2. Minimum Component Count Application
L6997S
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
REV. 1
Figure 1. Package
Table 1. Order Codes
Part Number
Package
L6997S
TSSOP20
L6997STR
Tape & Reel
TSSOP20


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