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PDF SC1205 Data sheet ( Hoja de datos )
| Número de pieza | SC1205 | |
| Descripción | HIGH SPEED SYNCHRONOUS POWER MOSFET DRIVER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
Description
The SC1205 is a cost effective Dual MOSFET Driver de-
signed for switching High and Low side Power MOSFETs.
Each driver is capable of driving a 3000pF load in 20ns
max rise/fall time and has a 20ns max propagation de-
lay from input transition to the gate of the power FET’s.
An internal Overlap Protection circuit prevents shoot-
through from Vin to GND in the main and synchronous
MOSFET’s. The Adaptive Overlap Protection circuit en-
sures the Bottom FET does not turn on until the Top FET
source has reached a voltage low enough to prevent
cross-conduction.
The high current drive capability (3A peak) allows fast
switching, thus reducing switching losses at high (up to
1MHz) frequencies without overheating the driver. The
high voltage CMOS process allows operation from 5-25
Volts at top MOSFET drain, thus making SC1205 suit-
able for battery powered applications. Connecting En-
able pin (EN) to logic low shuts down both drives and
reduces operating current to less than 10uA.
An Under-Voltage-Lock-Out circuit is included to guaran-
tee that both driver outputs are low when the 5V logic
level is less than or equal to 4.4V (typ) at supply ramp up
(4.35V at supply ramp down). An Internal temperature
sensor shuts down all drives in the event of
overtemperature. SC1205 is fabricated utilizing Bi-CMOS
technology for low quiescent current. The SC1205 is of-
fered in a standard SO-8 package.
Typical Application Circuit
SC1205
High Speed Synchronous
Power MOSFET Driver
Features
Fast rise and fall times (15ns typical with 3000pf
load)
3 Amp peak drive current
14ns max Propagation delay (BG going low)
Adaptive Non-overlapping Gate Drives provide
shoot-through protection
Floating top drive switches up to 25V
Under-Voltage lock-out
Overtemperature protection
Less than 10µA supply current when EN is low
Low cost
Applications
High Density sunchronous power supplies
Motor Drives/Class-D amps/Half bridge drivers
High frequency (to 1.2 MHz) operation allows use
of small inductors and low cost caps in place of
electrolytics
High efficiency portable computers
Battery powered applications
Vin 5-12V
2200uf
2. 5m
10nf
10
10u,CER
Rf
Ri
1 VID4
2 VID3
3 VID2
4 VID1
5 VID0
6 ERROUT
7 FB
8 RREF
VCC 16
BGOUT 15
OC+ 14
OUT1 13
OUT2 12
OC- 11
UVLO 10
GND 9
Rref
S C2 422A
+5V
TG
VS DRN
EN
CO
SC1205
BG
70N03
70N03
TG
VS DRN
EN
CO
SC1205
BG
70N03
70N03
Vcore, 1.7v,40A
Revision: September 22, 2004
1
www.semtech.com
1 page  
SC1205
POWER MANAGEMENT
Pin Configuration
Top View
(SO-8)
Ordering Information
Device (1)
SC1205CS.TR
SC1205CSTRT(2)
Package
SO-8
Temp Range (TJ)
0° to 125°C
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
Pin Descriptions
Pin # Pin Name
1 DRN
2 TG
3 BST
4 CO
5 EN
6 VS
7 BG
8 PGND
Pin Function
This pin connects to the junction of the switching and synchronous MOSFET's. This pin
can be subjected to a -2V minimum relative to PGND without affecting operation.
Output gate drive for the switching (high-side) MOSFET.
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).
TTL-level input signal to the MOSFET drivers.
When high, this pin enables the internal circuitry of the device. When low, TG and BG
are forced low and the supply current (5V) is less than 10µA.
+5V supply. A .22-1µF ceramic capacitor should be connected from 5V to PGND very
close to this pin.
Output drive for the synchronous (bottom) MOSFET.
Ground.
NOTE:
(1) All logic level inputs and outputs are open collector TTL compatible.
2004 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Evaluation Board Bill of Materials
Item Qty Reference
1 5 C1,C4,C13,C18,C26
2 12 C2,C3,C6,C16,C17,C19,C20,
C23,C24,C28,C29,C31
3 7 C5,C7,C10,C12,C14,C34, C35
4 1 C9
5 1 C11
6 3 C15, C21, C22
7 1 C25
8 1 C33
9 2 D7, D6
10 1
J1
11 2 L2, L1
12 4
13 1
14 2
15 5
16 1
17 2
18 1
19 1
20 1
21 1
22 1
23 1
24 1
25 1
26 1
27 2
28 1
29 1
Q1, Q3, Q4, Q5
R1
R2, R3
R5,R8,R9,R13,R99
R10
R11, R20
R14
R17
R18
R19
R30
R31
R32
R33
S1
U3, U1
U2
optional
2004 Semtech Corp.
11
SC1205
Part Number/Value Manufacturer
1uf
10u,CER
820uf,16V
1u, 16V
22nf
.1
100pf
820uf, OS
LL42
Panasonic
Sanyo
TTIB1106-708,
700nh
FDB7030BL
.005
10
0
100K
10k
11.5k
6.49k
1
26.7k
133
100
24.3K
10.0K
FALCO
Fairchild
Dale
SC1205
SC2422A
4.7-10 ohm
Semtech
Semtech
www.semtech.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC1205.PDF ] | |
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