LT1579-3.3 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LT1579-3.3 Datasheet PDF : 20 Pages
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LT1579
TYPICAL PERFORMANCE CHARACTERISTICS
Ripple Rejection
100
90
ILOAD = 150mA
VIN = 6V + 50mVRMS RIPPLE
80
70
COUT = 47µF
60
SOLID
TANTALUM
50
40
30
COUT = 4.7µF
SOLID
20
TANTALUM
10
0
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
1579 G30
Load Regulation
0
LT1579
–2
∆ILOAD = 1mA TO 300mA
LT1579-3
–4
LT1579-5
–6
–8
LT1579-3.3
–10
–12
–14
–16
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1579 G40
LT1579-5 “Hot” Plugging and
Unplugging Transient Response
6V
VIN1
5V
VOUT
50mV/DIV
UNPLUG
VIN1
REPLACE
VIN1
LT1579-5 Transient Response
100
50
0
– 50
–100
100
VIN = 6V
CIN = 1µF CERAMIC
COUT = 4.7µF TANTALUM
75
50
25
0
0 50 100 150 200 250 300 350 400 450 500
TIME (µs)
1579 G33
LT1579-5 Transient Response
100
50
0
– 50
–100
VIN = 6V
CIN = 1µF CERAMIC
COUT = 22µF TANTALUM
300
200
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1,0
TIME (ms)
1579 G34
PIN FUNCTIONS
VIN1: The primary power source is connected to VIN1. A
bypass capacitor is required on this pin if the device is
more than six inches away from the main input filter
capacitor. In general, the output impedance of a battery
rises with frequency, so it is advisable to include a bypass
capacitor in battery-powered circuits. A bypass capacitor
in the range of 1µF to 10µF is sufficient.
VIN2: The secondary power source is connected to VIN2.
A bypass capacitor is required on this pin if the device is
more than six inches away from the main input filter
capacitor. In general, the output impedance of a battery
rises with frequency, so it is advisable to include a bypass
capacitor in battery-powered circuits. A bypass capacitor
in the range of 1µF to 10µF is sufficient.
OUT: The output supplies power to the load. A minimum
output capacitor of 4.7µF is required to prevent oscilla-
tions. Larger output capacitors will be required for appli-
cations with large transient loads to limit peak voltage
transients.
ADJ: For the adjustable LT1579, this is the input to the
error amplifier. This pin is internally clamped to 7V and
– 0.6V (one VBE). It has a bias current of 6nA which flows
9
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