Linear Technology LT3464ETS8 User manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612
BOOST CONVERTER
1
LT3464ETS8
DESCRIPTION
Demonstration circuit 612 features the LT3464ETS8 in
two boost converter circuits, one configured for small
size and the other for high performance. The small size
circuit demonstrates the LT3464’s ability to operate with
a small 10µH chip inductor and a 0.22µF output capaci-
tor. The high performance circuit uses a 47µH inductor
and 1.0µF output capacitor and provides higher output
current and efficiency. Refer to Tables 1 and 2 for the
performance summary. The Burst Mode Operation of the
LT3464 allows the circuits to have a low input current at
no load and high efficiency over a broad current range
making it an ideal part for LCD bias applications as well
as cellular phones, digital cameras and handheld com-
puters. In addition, the LT3464’s integrated schottky re-
duces parts count, its integrated PNP disconnect switch
removes the load from the input during shutdown and
provides short circuit protection, and its CNTL pin allows
the output voltage to be externally controlled.
Design files for this circuit board are available. Call
the LTC factory.
Table 1. Performance Summary for the Small Size Circuit
PARAMETER CONDITION VALUE
Input Voltage Range 2.3V to 10.0V
VOUT 0mA to IOUT(MAX) 20.0V ±4%
IOUT(MAX) VIN = 3.6V
VIN = 5.0V
VIN = 8.4V
3mA
4mA
6mA
Typical output ripple VIN = 3.6V, IOUT = 3mA 100mV p-p
Typical efficiency VIN = 3.6V, IOUT = 3mA 60%
Typical no load input current VIN = 3.6V, IOUT = 0mA 85µA
Table 2. Performance Summary for the High Performance Circuit
PARAMETER CONDITION VALUE
Input Voltage Range 2.3V to 10.0V
V
OUT
0mA to IOUT(MAX) 15.0V ±4%
I
OUT(MAX)
V
IN
= 3.6V
V
IN
= 5.0V
V
IN
= 8.4V
9mA
14mA
25mA
Typical output ripple VIN = 3.6V, IOUT = 9mA 100mV p-p
Typical efficiency VIN = 3.6V, IOUT = 9mA 77%
Typical no load input current VIN = 3.6V, IOUT = 0mA 60µA

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612
BOOST CONVERTER
2
QUICK START PROCEDURE
Demonstration circuit 612 is easy to set up to evaluate
the performance of the LT3464ETS8. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the Vin or
Vout and GND terminals. See Figure 2 for proper scope
probe technique.
1. Make sure the SHDN jumper is in the ON position and
the CNTL jumper is in the INT REF position.
2. Turn on the input voltage source and set it to 3.6V.
3. Monitor the output voltage. For the small size circuit,
the output voltage should be 20.0V ±4% and for the
high performance circuit, the output voltage should be
15.0V ±4%.
4. Apply the full rated load to the output for an input
voltage of 3.6V. For the small size circuit, this is 3mA
and for the high performance circuit, this is 9mA. The
output voltage should still be within regulation.
5. With full rated load applied and with the input voltage
still at 3.6V, measure the input current. For the small
size circuit, the input current should be less than
31.0mA. For the high performance circuit, the input
current should be less than 54.0mA.
6. Once the proper output voltages are established, ad-
just the loads within the operating range and observe
the output voltage regulation, ripple voltage, efficiency
and other parameters.
Figure 1. Proper Measurement Equipment Setup
VIN
GND
Figure 2. Measuring Input or Output Ripple

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612
BOOST CONVERTER
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 612
BOOST CONVERTER
4

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