SC4508 Просмотр технического описания (PDF) - Semtech Corporation
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SC4508 Datasheet PDF : 10 Pages
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SC4508
POWER MANAGEMENT
Pin Configuration
TOP VIEW
VDD OSC COMP
OUT
CS
SS/SHDN
12
11
10
1
9
2
8
3
7
4
5
6
FB+
FB-
PGND
Ordering Information
DEVICE
SC4508IMLTRT(2)
PACKAGE
MLPQ-12(1)
Temp. Range (TJ)
-40°C to 150°C
Notes:
(1) Only available in tape and reel packaging. A reel
contains 3000 devices.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
VREF NC AGND
(MLPQ-12 4x4)
Pin Descriptions
Pin #
Pin Name
1
OUT
2
CS
3
SS/SHDN
4
VREF
5
NC
6
AGND
7
PGND
8
FB-
9
FB+
10
COMP
11
OSC
12
VDD
-
THERMAL
PAD
2004 Semtech Corp.
Pin Function
Gate driver output for external P-MOSFET. OUT swings from VDD to PGND.
Current sense input pin. Connect a current sense resistor between VDD and CS.
Soft start pin. Connects an external capacitor between this pin and AGND. The ramp up
time is defined by the capacitor. The device goes into shutdown when VSS/SHDN is pulled
below 0.25V.
1.25V reference output. VREF can source up to 1mA. Bypass with a 0.1uF ceramic
capacitor from VREF to AGND.
No connection.
Analog ground.
Power ground.
Error amplifier inverting input.
Error amplifier non-inverting input.
Compensation pin for the internal transconductance error amplifier. Connect loop
compensation network from COMP to AGND.
Oscillator frequency set input. Connect a ceramic capacitor from OSC to AGND to set the
internal oscillator frequency from 100KHz to 1.5MHz. Use equation
oscillator frequency. C is the capacitor from OSC to AGND.
f
=
100µA
C • 0.65
to set the
Supply voltage. Bypass a 1uF ceramic capacitor from VDD to PGND.
Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected
internally.
4
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