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PDF SC420 Data sheet ( Hoja de datos )
| Número de pieza | SC420 | |
| Descripción | Synchronous Power MOSFET Driver | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
SC420
High Speed, Combi-SenseTM, Synchronous
Power MOSFET Driver for Mobile Applications
TARGET
POWER MANAGEMENT
Description
Features
The SC420 is a cost effective Dual MOSFET Driver, in-
corporating Semtech’s patented Combi-SenseTM technol-
ogy, designed for switching High and Low side Power
MOSFETs in Step-down Switching regulators. A 20ns max
www.DaptarSohpeaegt4aUt.icoonm delay from input transition to the gate of
the power FET’s guarantees operation at high switching
frequencies. Internal overlap protection circuit prevents
shoot-through from Vin to GND in the main and synchro-
nous MOSFETs.
High current drive capability (2A peak) allows fast
switching, thus reducing switching losses at high (up to
1.5MHz) frequencies without causing thermal stress on
the driver.
The high voltage CMOS process allows operation up to
27 Volts, making the SC420 suitable for adaptor pow-
ered applications. Under-voltage-lockout and over-tem-
perature shutdown features are included for proper and
safe operation. The SC420 is offered in a space saving
MLP-12 package.
u High efficiency
u Shutdown mode for increased power saving
u Tri-state capability
u Fast rise and fall times (15ns typical with 3000pF
load)
u 5V gate drive
u Ultra-low (<20ns) propagation delay (BG going low)
u Adaptive and programmable non-overlapping gate
drives provide shoot-through protection
u Floating top drive switches up to 27V
u High frequency (to 1.5 MHz) operation allows use
of small inductors and low cost ceramic capacitors
u Under-voltage lockout
u Low quiescent current
u MLP packaging provides superior thermal perfor-
mance in a small footprint
Conceptual Application Circuit
Applications
u High efficiency portable and notebook computers
u Battery powered applications
VIN2
VIN
VIN
Combi-SenseTM PWM
FB Controller IC
EN GND CS- CS+
D1
VIN2
VIN
CO
SC420
EN
CDELAY
VPN
TG
BST
DRN
BG
CDELAY
RVPN
CVPN
M1
CBST
L1
M2
VOUT
CL
Rev 4. December 2003
Figure 1
1
United States Patent No. 6,441,597
www.semtech.com
1 page  
SC420
POWER MANAGEMENT
Pin Configuration
Top View
12 11 10
TG
www.DataSheet4U.com
BST
CO
1
2
3
45 6
Ordering Information
Device (1)
SC420IMLTR
Package
MLP-12
Temp Range (TJ)
-40° to 125°C
9 BG
8 VIN
Note:
(1) Only available in tape and reel packaging. A reel
contains 3000 devices.
(2) This device is ESD sensitive. Use of standard ESD
handling precautions is required.
7 CDELAY
(MLP-12)
Pin Descriptions
Pin Pin
# Name
Pin Function
1 TG Output gate drive for the switching (high-side) MOSFET.
2
BST
Bootstrap pin. A capacitor is connected between BST and DRN pins to develop the floating bootstrap
voltage for the high-side MOSFET. The capacitor value is typically between 0.1µF and 1µF (ceramic).
3 CO Logic level PWM input signal to the SC420 supplied by external controller.
4
VIN2
Input power (VBAT) to the DC/DC converter. Used as supply reference for internal Combi-Sense TM
circuitry. Connect as close as possible to Drain of TOP switching MOSFET.
5
EN
Active high logic level input signal. A logic High enables TG and BG switching. A low level disables
outputs and reduces quiescent current to IQ SD
6
VPN
Virtual Phase Node. Connect an RC between this pin and the output sense point to Enable Combi-
Sense TM operation.
The capacitance connected between this pin and GND sets the additional propagation delay for BG
7 CDELAY going low to TG going high. Total propagation delay =20ns + 1ns/pF. If no capacitor is connected, the
propragation delay = 20ns.
8
VIN
Input supply for the bottom drive and the Logic. A 1µF-10µF Ceramic Capacitor must be connected
from this pin to PGND, placed less than 0.5" from SC420.
9 BG Output drive for the synchronous (bottom) MOSFET.
10 PGND Ground. Keep this pin close to the synchronous MOSFETs source.
11 N.C. No Connect
12
DRN
This pin connects to the junction of the switching and synchronous MOSFETs . This pin can be subjected
to a -2V minimum relative to PGND without affecting operation.
© 2003 Semtech Corp.
5 United States Patent No. 6,441,597
www.semtech.com
5 Page 
POWER MANAGEMENT
DRN and AUX Timing
www.DataSheet4U.com
SC420
VIN2 = 10V
© 2003 Semtech Corp.
11 United States Patent No. 6,441,597
www.semtech.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC420.PDF ] | |
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