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PDF SC1405CTS Data sheet ( Hoja de datos )

Número de pieza SC1405CTS
Descripción High Speed Synchronous Power MOSFET Smart Driver
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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No Preview Available ! SC1405CTS Hoja de datos, Descripción, Manual

SC1405CTS
High Speed Synchronous Power
MOS.ET Smart Driver
POWER MANAGEMENT
Description
.eatures
The SC1405CTS is a Dual-MOS.ET Driver with an inter-
nal Overlap Protection Circuit to prevent shoot-through.
Each driver is capable of driving a 3000p. load in 15ns
rise/fall time and has ULTRA-LOW propagation delay from
input transition to the gate of the power .ET’s. Adaptive
Overlap Protection circuit ensures that the synchronous
.ET does not turn on until the top .ET source has reached
a voltage low enough to prevent shoot-through. The de-
lay between the bottom gate going low to the top gate
transitioning high is externally programmable via a ca-
pacitor to minimize dead time. The bottom .ET may be
disabled at light loads by keeping S_MOD low to trigger
asynchronous operation, thus saving the bottom .ET’s
gate drive current and inductor ripple current. An inter-
nal voltage reference allows threshold adjustment for
an Output Over-Voltage protection circuitry, independent
of the PWM controller. The device provides overvoltage
protection independant of the PWM feedback loop with
a unique “adaptive OVP” comparator which rejects noise
but responds quickly to a true OVP situation.
Under-Voltage-Lock-Out circuit is included to guarantee
that both driver outputs are off when Vcc is less than or
equal to 4.4V (typ) at supply ramp up (4.35V at supply
ramp down). A CMOS output provides status indication
of the 5V supply. A low enable input places the IC in stand-
by mode, reducing supply current to less than 10µA.
SC1405CTS is offered in a high pitch (.025” lead spac-
ing) TSSOP package.
Typical Application Circuit
K .ast rise and fall times (15ns with 3000pf load)
K 14ns max. Propagation delay (BG going with low)
K Adaptive and programmable shoot-through
protection
K Adaptive overvoltage protection
K Wide input voltage range (4.5-25V)
K Programmable delay between MOS.ET’s
K Power saving asynchronous mode control
K Output overvoltage protection/overtemp shutdown
K Under-Voltage lock-out and power ready signal
K Less than 10µA stand-by current (EN=low)
K Power ready output signal
K High frequency (to 1.2MHz) operation allows use of
small inductors and low cost caps in place of
electrolytics
Applications
K High Density/.ast transient microprocessor power
supplies
K Motor Drives/Class-D amps
K High efficiency portable computers
+V_5
+ V_IN
PW M
Controller
SSCC11440055
SSmmaartrt
MMOOSSFFEETT
DDrirviveerr
Lo ++VVCCCC__CCPPUU__CCOORREE
0.925V-2.0V
Co Up to 14A
VVIIDD [[44::00]]
SSCC11440066GG
IMIMVVPP
CCOONNTTRROOLLLLEERR
LDO
Controller
LDO
Controller
3.3V
3.3V
1.5V
2.5A
++VVCCCC__CCPPUU__IIOO
2.5V
150mA
++VVCCCC__CCPPUU__CCLLKK
Revision 1, April 2001
1
www.semtech.com

1 page




SC1405CTS pdf
POWER MANAGEMENT
Application Circuit
INPUT POWER
+5V
+
10uF,6.3V
.1uF
<< P_READY
>> PWM IN
(20KHz-1MHz)
47pF
<< DSPS_DR
<<< O u tpu t Fee dback to P WM
C o n tro l l e r
D1
1N5819
8
3
Vcc
GND
7
2
4
6
PRDY
EN
CO
BST
TG
DRN
14
13
12
9
1 DELAY_C
BG
OVP_S
5
DSPS_DR
S_MOD PGND
11
10
SC1405
+++
.22uF
2.2
2.2
MTB75N03
75A,30V
MTB75N03
75A,30V
Over-Voltage Sense
SC1405CTS
+++
Timing Diagram
2001 Semtech Corp.
5
www.semtech.com

5 Page





SC1405CTS arduino
SC1405CTS
POWER MANAGEMENT
Typical Characteristics (Cont.)
Delay vs. Temp.
SC1405C OVP Delay vs. Temperature
600.00
500.00
400.00
300.00
200.00
100.00
0.00
-25 -5 15 35 55 75 95
Tem perature (C)
50mV Overdrive
100mV Overdrive
115 135
Delay vs. Overdrive
Typical Delay vs. Overdrive (T=25C)
10000
1000
100
10
2001 Semtech Corp.
Overdrive (mV)
11
1000
www.semtech.com

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