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SC471MLTRT Datasheet(PDF) 7 Page - Semtech Corporation

Part # SC471MLTRT
Description  Synchronous Buck Controller with Multi-Level VOUT Transition Support
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC471MLTRT Datasheet(HTML) 7 Page - Semtech Corporation

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© 2006 Semtech Corp.
SC471/SC471A
www.semtech.com
POWER MANAGEMENT
Pin Descriptions
Pin
Pin Name
Pin Function
1
LX
Switching (phase) node
2
BST
Boost capacitor connection for high-side gate drive
3
VCC
5V power input for the internal circuits and gate drive outputs
4
DL
Gate drive output for the low-side external MOSFET
5
GND
Power ground. This is the return point for the DL driver output, and the reference point for the
ILIM and zero cross circuits
6RTN
Return or analog ground for the FB input and FB resistor divider . Connect to GND directly at the
IC. All feedback components should connect to this ground.
7
D1
Drain of second internal MOSFET which is controlled by G1
8
D0
Drain of first internal MOSFET which is controlled by G0
9FB
Feedback sense point. The FB threshold is 0.75V; the resistor divider ratio between VOUT and
FB sets the output voltage. This ratio can be modified using the G0/G1 inputs to switch resistors
in/out at D0/D1.
10
VOUT
Output voltage sense point for determining On-Time
11
PGOOD
Open-drain power good indicator - a high impedance indicates power is good - an external pull-up
resistor is required
12
EN
Enable input - connect EN to RTN to disable the SC471/A
13
ILIM
Current limit sense point — to program the current limit connect a resistor from ILIM to
LX or to a current sense resistor
14
G0
Control input for the D0 MOSFET. A logic high (low) energizes the D0 MOSFET on the SC471
(SC471A), pulling D0 to ground.
15
G1
Control input for the D1 MOSFET. A logic high (low) energizes the D1 MOSFET on the SC471
(SC471A), pulling D1 to ground.
16
DH
Gate drive output for the high-side external MOSFET
TPAD
Mounting pad. Not connected internally - connect to system ground plane through preferably one
large vias or multiple smaller vias


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