LTC3530EMS Просмотр технического описания (PDF) - Linear Technology
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LTC3530EMS Datasheet PDF : 16 Pages
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LTC3530
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified.
Load Transient Response in Fixed
Frequency Mode, No Load to 300mA
Load Transient Response in
Auto Burst Mode Operation,
No Load to 500mA
Typical Burst Mode Waveforms
VOUT
100mV/DIV
VOUT
100mV/DIV
VOUT
50mV/DIV
LOAD
0.25A/DIV
100μs/DIV
VIN = 3.6V
VOUT = 3.3V
COUT = 22μF, X5R CERAMIC
LOAD
0.25A/DIV
3530 G13
100μs/DIV
VIN = 3.6V
VOUT = 3.3V
COUT = 47μF, X5R CERAMIC + 100μF
LOW ESR TANTALUM
INDUCTOR
CURRENT
0.25A/DIV
3530 G14
22μs/DIV
COUT = 22μF, X5R CERAMIC
3530 G15
Transition from Burst Mode
Operation to Fixed Frequency Mode
VOUT
200mV/DIV
BURST
2V/DIV
INDUCTOR
CURRENT
0.5A/DIV
200μs/DIV
COUT = 22μF, X5R CERAMIC
3530 G16
Maximum Output Current vs VIN
2000
1800
1600
1400
1200
1000
IOUT
800
600
400
200
1.5
250mA AT 1.8V
2.5
3.5
VIN (V)
4.5
5.5
3530 G17
PIN FUNCTIONS
RT (Pin 1): Programs the Frequency of the Internal Oscil-
lator. Connect a resister from RT to ground.
f(kHz) = 33,170/RT (kΩ)
BURST (Pin 2): Used to Set the Automatic Burst Mode
Threshold. Connect a resistor and capacitor in parallel
from this pin to ground. See the Applications Information
section for component value selection. For manual control,
ground the pin to force Burst Mode operation, connect to
VIN to force fixed frequency PWM mode.
SW1 (Pin 3): Switch Pin Where the Internal Switches A and
B are Connected. Connect inductor from SW1 to SW2. An
optional Schottky diode can be connnected from SW1 to
ground for a moderate efficiency improvement. Minimize
trace length to keep EMI down.
SW2 (Pin 4): Switch Pin Where the Internal Switches C
and D are Connected. For applications with output voltages
over 4.3V, a Schottky diode is required from SW2 to VOUT
to ensure the SW pin does not exhibit excessive voltage.
3530fb
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