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LTC3454 Datenblatt(PDF) 5 Page - Linear Technology

Teilenummer LTC3454
Bauteilbeschribung  1A Synchronous Buck-Boost High Current LED Driver
PDF  12 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3454 Datenblatt(HTML) 5 Page - Linear Technology

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LTC3454
5
3454fa
LED Power Efficiency vs LED Current
Oscillator Frequency vs Temperature
TEMPERATURE (°C)
–55
900
920
960
980
1000
1100
1040
–15
25
45
125
3454 G16
940
1060
1080
1020
–35
5
65
85 105
VOUT = 3V
VIN = 2.7V
VIN = 3.6V
VIN = 5.5V
VIN = 4.2V
ILED (mA)
100
80
85
90
900
3454 G17
75
70
60
300
500
700
200
1000
400
600
800
65
100
95
VIN = 3.6V
TA = 25°C
EFFICIENCY = (VOUT – VLED)ILED/VINIIN
FRONT PAGE APPLICATION
EN1 (Pin 1): Enable Input Pin for ISET1 Current.
EN2 (Pin 2): Enable Input Pin for ISET2 Current.
ISET1 (Pin 3): LED Current Programming Pin. A resistor
to ground programs the current through the LED to ILED
= 3850(0.8V/RISET1). This amount of current adds to any
amount set by EN2/ISET2 if used.
ISET2 (Pin 4): LED Current Programming Pin. A resistor
to ground programs the current through the LED to ILED
= 3850(0.8V/RISET2). This amount of current adds to any
amount set by EN1/ISET1 if used.
LED (Pin 5): Low Dropout Output for LED Current Biasing.
Connect the LED between VOUT and the LED pin.
SW2 (Pin 6): Switching Node. External inductor con-
nects between SW1 and SW2. Recommended value is
4.7μH/5μH.
VOUT (Pin 7): Buck-Boost Output Rail. Bypass to GND with
a ceramic capacitor. Recommended value is 10μF.
VC (Pin 8): Compensation Point for the Internal Error
Amplifier Output. Connect a ceramic capacitor from VC
to GND. Recommended value is 0.1μF.
VIN (Pin 9): Voltage Input Supply Pin (2.7V ≤ VIN ≤ 5.5V).
Bypass to GND with a ceramic capacitor. Recommended
value is 10μF.
SW1 (Pin 10): Switching Node. External inductor con-
nects between SW1 and SW2. Recommended value is
4.7μH/5μH.
Exposed Pad (Pin 11): Ground Pin. Solder to PCB ground
for electrical contact and optimal thermal performance.
Output Voltage Ripple
Back Page Application
20mV/DIV
500ns/DIV
VIN = 3.6V
ILED = 500mA
3454 G19
Start-Up Transient
Back Page Application
0V, 0A
CH1, VOUT
1V/DIV
CH2, ILED
500mA
FINAL VALUE
CH3, VEN1
1V/DIV
0V
5ms/DIV
VIN = 3.6V
ILED = 500mA
3454 G19
TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS



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