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L6995S Scheda tecnica(PDF) 1 Page - STMicroelectronics

Il numero della parte L6995S
Spiegazioni elettronici  LOSSLESS CURRENT LIMIT
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6995S Scheda tecnica(HTML) 1 Page - STMicroelectronics

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L6995S
April 2004
1
FEATURES
CONSTANT ON TIME TOPOLOGY ALLOWS
OPERATION WITH LOWER DUTY THAN
PWM TOPOLOGY
VERY FAST LOAD TRANSIENTS
5V Vcc SUPPLY
1.5V TO 35V INPUT VOLTAGE RANGE
0.9V ±1% VREF
MINIMUM OUTPUT VOLTAGE AS LOW AS 0.9V
SELECTABLE SINKING MODE
LOSSLESS CURRENT LIMIT
REMOTE SENSING
OVP,UVP LATCHED PROTECTIONS
600
µA TYP QUIESCENT CURRENT
POWER GOOD AND OVP SIGNALS
PULSE SKIPPING AT LIGHT LOADS
2
APPLICATIONS
I/O BUS FOR CPU CORE SUPPLY
NOTEBOOK COMPUTERS
NETWORKING DC-DC
DISTRIBUTED POWER
3
DESCRIPTION
The device is a step-down controller specifically de-
signed to provide extremely high efficiency conver-
sion, with losses current sensing tecnique.
The "constant on-time" topology assures fast load
transient response. The embedded "voltage feed-for-
ward" provides nearly constant switching frequency
operation.
An integrator can be introduced in the control loop to
reduce the static output voltage error.
The available remote sensing improve the static and
dynamic regulation recovering the wires voltage
drop. Pulse skipping technique reduces power con-
sumption at light load. Drivers current capability al-
lows output current in excess of 20A.
STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL
INPUT-OUTPUT CONVERSION
Figure 2. Minimum Component Count Application
SS
C
C
BOOT
OUT
C
0.9V
Vo
L6995S
35V
Rin2
Rin1
CIN
RILIM
5V
INT
VFB
SS
OSC
BOOT
HGATE
PHASE
LGATE
PGND
GND
NOSKIP
ILIM
VSENSE
VREF
5V
VREF
C
L
BOOT
D
HS
LS
DS
REV. 1
Figure 1. Package
Table 1. Order Codes
Part Number
Package
L6995S
TSSOP20
L6995STR
Tape & Reel
TSSOP20
Obsolete
Product(s)
- Obsolete
Product(s)


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