LT1528 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1528 Datasheet PDF : 12 Pages
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LT1528
TYPICAL PERFORMANCE CHARACTERISTICS
Ripple Rejection
80
70
60
50
COUT = 4 × 47μF
SOLID TANTALUM
40
COUT = 47μF
30
SOLID TANTALUM
20
10 IOUT = 1.5A
VIN = 6V + 50mVRMS RIPPLE
0
10
100
1k
10k
FREQUENCY (Hz)
100k 1M
1528 TPC19
Transient Response
Load Regulation
0
VIN = VOUT(NOMINAL) + 1V
–5
ΔILOAD = 1mA TO 3A
–10
–15
–20
–25
–30
–50 –25
0 25 50 75
TEMPERATURE (°C)
Transient Response
100 125
1528 TPC20
100
50
0
–50
–100
VIN = 5V
CIN = 3.3μF
COUT = 47μF
VIN = 5V
100 CIN = 3.3μF
50 COUT = 4 × 47μF
0
–50
–100
3
2
1
0
0 20 40 60 80 100 120 140 160 180 200
TIME (μs)
1528 TPC21
3
2
1
0
0 20 40 60 80 100 120 140 160 180 200
TIME (μs)
1528 TPC22
PIN FUNCTIONS
OUTPUT (Pin 1): The OUTPUT pin supplies power to the
load. A minimum output capacitor of 3.3μF is required
to prevent oscillations. Larger values will be needed to
achieve the transient performance required by high speed
microprocessors. See the Applications Information sec-
tion for more on output capacitance and reverse output
characteristics.
SENSE (Pin 2): The SENSE pin is the input to the error
amplifier. Optimum regulation will be obtained at the point
where the SENSE pin is connected to the OUTPUT pin. For
most applications the SENSE pin is connected directly to
the OUTPUT pin at the regulator. In critical applications
small voltage drops caused by the resistance (RP) of PC
traces between the regulator and the load, which would
6
normally degrade regulation, may be eliminated by con-
necting the SENSE pin to the OUTPUT pin at the load as
shown in Figure 1 (Kelvin Sense Connection). Note that
the voltage drop across the external PC traces will add
to the dropout voltage of the regulator. The SENSE pin
bias current is 150μA at the nominal regulated output
voltage. See SENSE Pin Current vs Temperature in the
Typical Performance Characteristics section. This pin is
internally clamped to – 0.6V (one VBE).
The SENSE pin can also be used with a resistor divider
to achieve output voltages above 3.3V. See the Applica-
tions Information section for information on adjustable
operation.
1528fb
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