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SC339 Datasheet Preview

SC339 Datasheet

Ultra Low Output Voltage Linear FET Controller

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POWER MANAGEMENT
Description
The SC339 is an ultra-low output voltage, linear power
supply controller designed to simplify power manage-
ment for notebook PCs. It is part of Semtech’s Smart
LDOTM family of products. The SC339 has a user
adjustable output that can be set anywhere between 0.5V
and 3.3V using two external resistors.
SC339 features include tight output voltage regulation (±
1% over 0°C to +85°C), enable control, open drain power
good signal, under-voltage protection and soft-start. The
wwenwa.DbaletapShineeatl4loUw.csotmhe part to enter a very low power standby
mode. Pulling it high enables the output. The power good
pin is an open drain and asserts low when the voltage at
the adjust pin is below 88% (typ) of nominal. If the voltage
at the adjust pin is below 50% (typ) of nominal, the under-
voltage protection circuitry will shut down the output. The
SC339 is available in a tiny SOT-23 6-pin surface mount
package.
Typical Application Circuit
1.2V +/-5% IN
SC339
Ultra Low Output Voltage
Linear FET Controller
Features
± 1% Voltage Accuracy Over-Temperature
Low Shutdown Current
Runs Off 5V Supply
Ultra-Fast Transient Response
Enable Control for the Output
Power Good Monitoring and Signaling for the Output
Gate Drive from Input Supply Enables Use of
N-Channel MOSFET
User Selectable Dropout Voltage
Under-Voltage Protection for the Output
SOT-23 6-pin Surface Mount Package
Compatible with Ceramic Capacitors
Low Ripple Output
Internal 1ms soft-start requires no external compo-
nents
Fully WEEE and RoHS compliant
Applications
Notebook PCs
Desktop Computers
Battery Powered Devices
Portable Instruments
IRF7311
C1 or similar
5V IN
Sept 11, 2006
1.05V
Enable
IN DRV
GND SC339 ADJ
EN PGD
1.05V
Power Good
R3 (1)
C4
Notes:
(1) Optional Components to use with ceramic output
capacitors (C2)
C3 (1)
1
Vout = (1+R1/R2)*0.5
1.05V @ 3A
C2
R1
R2
www.semtech.com




Semtech

SC339 Datasheet Preview

SC339 Datasheet

Ultra Low Output Voltage Linear FET Controller

No Preview Available !

SC339
POWER MANAGEMENT
PRELIMINARY
Absolute Maximum Ratings
Exceeding the specications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specied in the
Electrical Characteristics section is not implied. Exposure to absolute maximum rated conditions for extended periods of time may affect device reliability.
Parameter
Symbol
Maximum
Units
Input Supply Voltage
Drive Pin
Adjust and Power Good Pin
Enable Pin
wwwT.DhaetramSahel eImt4pUe.cdoamnce Junction to Ambient
Thermal Impedance Junction to Case
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
VIN
VDRV
VADJ, VPGD
VEN
θJA
θJC
TA
TJ
TSTG
TLEAD
VESD
-0.3 to +6
-0.3 to VIN + 0.3V
-0.3 to VIN + 0.3V
-0.3 to VIN + 0.3V
190
81
-40 to +85
-40 to +125
-65 to +150
300
2
V
V
V
V
°C/W
°C/W
°C
°C
°C
°C
kV
Electrical Characteristics
Unless
specied:
TA
=
25°C,
VIN
=
VEN
=
5V
±
5%,
V (1)
PWR
=
1.5V
±
5%,
0A
IOUT
3A.
Values in bold apply over full operating ambient temperature range.
Parameter
Symbol
Conditions
Min Typ Max Units
Supply Voltage
Quiescent Current
Standby Current
Input Under-Voltage Lockout
VIN
IQ
IQ(OFF)
VIN = 5V
EN low
4.5 5
5.5
130 200
0.1 1.0
V
μA
μA
Start Threshold
Hysteresis
EN
VUVLO
VHYST
VIN rising
VIN falling
4.20 V
0.10 V
Enable Input Threshold
VIH
VIL
Output on
Output off
2.8
V
1.8
Enable Input Bias Current
VIN = VEN = 5V
-1
+1 μA
© 2006 Semtech Corp.
2
www.semtech.com


Part Number SC339
Description Ultra Low Output Voltage Linear FET Controller
Maker Semtech
Total Page 15 Pages
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