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LTC3216EDE#PBF

P1-P3P4-P6P7-P9P10-P12
LTC3216
4
3216fc
TYPICAL PERFORMANCE CHARACTERISTICS
Input Shutdown Current
vs Input Voltage
Oscillator Frequency
vs Supply Voltage Effi ciency vs V
IN
I
SET
/I
LED
Current Ratio vs I
LED
Current 1.5x Mode CPO Output Ripple
1x Mode Charge Pump Open-
Loop Output Resistance vs
Temperature
1.5x Mode Charge Pump
Open-Loop Output Resistance
(1.5V
IN
– V
CPO
)/I
CPO
vs Temperature
2x Mode Charge Pump
Open-Loop Output Resistance
(2V
IN
– V
CPO
)/I
CPO
vs Temperature
(T
A
= 25°C unless otherwise specifi ed)
TEMPERATURE (°C)
–40
SWITCH RESISTANCE (Ω)
35
85
3216 G04
–15 10 60
0.31
0.29
0.27
0.25
0.23
0.21
0.19
0.17
0.15
I
CPO
= 200mA
V
IN
= 3.6V
V
IN
= 3.3V
V
IN
= 3.9V
TEMPERATURE (°C)
–40
OUTPUT RESISTANCE (Ω)
10
60
85
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3216 G05
–15 35
V
IN
= 3V
V
CPO
= 4.2V
C
IN
= C1 = C2 = 2.2µF
C
CPO
= 4.7µF
–40
10
60
85
–15 35
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3216 G06
V
IN
= 3V
V
CPO
= 4.8V
C
IN
= C1 = C2 = 2.2µF
C
CPO
= 4.7µF
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
INPUT SHUTDOWN CURRENT (µA)
3216 G07
INPUT VOLTAGE (V)
2.9 4.5
3.3
3.7
4.13.1 3.5 3.9
4.3
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
FREQUENCY (kHz)
930
920
910
900
890
880
870
860
850
840
3216 G08
SUPPLY VOLTAGE (V)
2.9 4.5
3.3
3.7
4.1
3.1 3.5 3.9
4.3
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
V
IN
(V)
2.8
EFFICIENCY (PLED/PIN) (%)
100
90
80
70
60
50
40
30
20
10
0
3.2
3.6
3.8
3216 G09
3.0 3.4
4.0
4.2
4.4
LED = LXCL-PWF1 LUMILEDS
600mA
I
LED
= 800mA
400mA
200mA
I
LED
CURRENT(mA)
0
CURRENT RATIO
200
400
500 900
3216 G10
100 300
600
700
800
3400
3350
3300
3250
3200
3150
3100
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
3216 G11
V
CPO
50mV/DIV
A/C COUPLED
500ns/DIVV
IN
= 3.6V
I
CPO
= 200mA
LTC3216
5
3216fc
2x Mode CPO Output Ripple
Charge Pump Mode Switching
and Input Current
TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
C2
+
, C1
+
, C2
–
, C1
–
(Pins 1, 2, 10, 12): Charge Pump
Flying Capacitor Pins. A 2.2µF X5R or X7R ceramic ca-
pacitor should be connected from C1
+
to C1
–
and from
C2
+
to C2
–
.
CPO (Pin 3): Output. CPO is the output of the charge
pump. This pin may be enabled or disabled using the EN1
and EN2 inputs. A 4.7µF X5R or X7R ceramic capacitor is
required from CPO to GND.
I
SET1
/I
SET2
(Pins 4, 6): LED Current Programming Resistor
Pins. The I
SET1
and I
SET2
pins will servo to 1.22V. Resistors
connected between each of these pins and GND are used
to set the high and low LED current levels. Connecting
a resistor of 2k or less will cause the LTC3216 to enter
overcurrent shutdown mode.
I
LED
(Pin 5): Output. I
LED
is the LED current source output.
The LED is connected between CPO (anode) and I
LED
(cathode). The current into the I
LED
pin is set via the EN1
and EN2 inputs, and the programming resistors connected
from I
SET2
and I
SET1
to GND.
EN1/EN2 (Pins 7, 8): Inputs. The EN1 and EN2 pins are
used to select which current level is being supplied to the
LED, as well as to put the part into shutdown mode. The
truth table for these pins is as follows:
Truth Table
EN1 EN2 MODE
0 0 Shutdown
1 0 Low Current
0 1 High Current
1 1 Low + High Current
V
IN
(Pin 9): Power. Supply voltage for the LTC3216. V
IN
should be bypassed with a 2.2µF or greater low impedance
ceramic capacitor to GND.
GND (Pin 11): Charge Pump Ground. This pin should be
connected directly to a low impedance ground plane.
Exposed Pad (Pin 13): Control Signal Ground. This pad
must be soldered to a low impedance ground plane for
optimum thermal and electrical performance.
(T
A
= 25°C unless otherwise specifi ed)
3216 G12
V
CPO
20mV/DIV
A/C COUPLED
500ns/DIVV
IN
= 3.6V
I
CPO
= 400mA
1ms/DIV
EN2
5V/DIV
I
VIN
500mA/DIV
V
CPO
1V/DIV
3216 G13
V
IN
= 3V
LTC3216
6
3216fc
BLOCK DIAGRAM
OPERATION
The LTC3216 uses a fractional switched capacitor charge
pump to power a high current LED with a programmed
regulated current. The part starts up into the 1x mode. In
this mode, V
IN
is directly connected to CPO. This mode
provides maximum effi ciency and minimum noise. The
LTC3216 will remain in this mode until the LED current
source begins to dropout. When dropout is detected,
the LTC3216 will switch to 1.5x mode after a soft-start
period. Any subsequent dropout detected will cause the
part to enter 2x mode. The part may be reset to 1x mode
by bringing the part into shutdown mode and then reen-
abling the part.
A two phase nonoverlapping clock activates the charge
pump switches. In the 2x mode, the fl ying capacitors are
charged on alternate clock phases from V
IN
. While one
capacitor is being charged from V
IN
, the other is stacked
on top of V
IN
and connected to the output. Alternatively, in
the 1.5x mode the fl ying capacitors are charged in series
during the fi rst clock phase, and stacked in parallel on
top of V
IN
on the second clock phase. This sequence of
charging and discharging the fl ying capacitors continues
at a free running frequency of 900kHz (typ).
The current delivered to the LED load is controlled by the
internal programmable current source. Three discrete
current settings (Low, High and Low + High) are avail-
able and may be selected via the EN2 and EN1 pins. The
values of these currents may be selected by choosing
the appropriate programming resistors. Each resistor is
2
3
5
1311
12
46
–
+
1 10
1x MODE: CPO = V
IN
1.5x MODE: CPO = 4.6V
2x MODE: CPO = 5.1V
V
REF
DROPOUT
DETECTOR
CURRENT
SOURCE
CONTROL
CONTROL
LOGIC
MODE
CONTROL
OSCILLATOR
8
9
7
GND
CPO
I
LED
GNDI
SET2
I
SET1
V
IN
EN1
EN2
C1
+
C1
–
C2
+
C2
–
3216 BD
P1-P3P4-P6P7-P9P10-P12

LTC3216EDE#PBF

Mfr. #:
Buy LTC3216EDE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 1A L N Hi C LED Ch Pump w/ Independent T
Lifecycle:
New from this manufacturer.
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