LTC3210EPD-1#TRPBF Linear Technology, LTC3210EPD-1#TRPBF Datasheet - Page 8

• Manufacturer Part Number: LTC3210EPD-1#TRPBF
• Description: IC LED DRVR WHITE BCKLT 16-UTQFN
• Manufacturer: Linear Technology
• Type: Backlight, White LEDr

Specifications of LTC3210EPD-1#TRPBF

• Topology: Step-Up (Boost), Switched Capacitor (Charge Pump)
• Number Of Outputs: 5
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 800kHz
• Voltage - Supply: 2.9 V ~ 4.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-UTQFN (16-µTQFN)
• Operating Temperature: -40°C ~ 85°C
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Current - Output / Channel: -
• Efficiency: -

LTC3210-1
block Diagram
operaTion
Power Management
The LTC3210-1 uses a switched capacitor charge pump
to boost CPO to as much as 2 times the input voltage up
to 5.1V. The part starts up in 1x mode. In this mode, V
is connected directly to CPO. This mode provides maxi-
mum efficiency and minimum noise. The LTC3210-1 will
remain in 1x mode until an LED current source drops out.
Dropout occurs when a current source voltage becomes
too low for the programmed current to be supplied. When
dropout is detected, the LTC3210-1 will switch into 1.5x
mode. The CPO voltage will then start to increase and will
attempt to reach 1.5x V

V
ENM
ENC
BAT
RM
RC
15
10
8
3
9
500
500
250k
250k
BAT
50ns FILTER
50ns FILTER
up to 4.6V. Any subsequent
OSCILLATOR
800kHz
+
+
+
–
–
–
1.215V
1.215V
CHARGE PUMP
C1P
COUNTER
COUNTER
1
DOWN
DOWN
TIMER
TIMER
TIMER
6-BIT
3-BIT
BAT
C1M
14
dropout will cause the part to enter the 2x mode. The CPO
voltage will attempt to reach 2x V
will be reset to 1x mode whenever the part is shut down
or when ENC goes low.
A two phase nonoverlapping clock activates the charge
pump switches. In the 2x mode the flying capacitors are
charged on alternate clock phases from V
input current ripple and CPO voltage ripple. In 1.5x mode the
flying capacitors are charged in series during the first clock
phase and stacked in parallel on V
phase. This sequence of charging and discharging the flying
capacitors continues at a constant frequency of 800kHz.
ENABLE MAIN
SHUTDOWN
ENABLE CAM
LINEAR
LINEAR
6-BIT
3-BIT
DAC
DAC
C2P
16
C2M
13
ENABLE CP
CURRENT
SOURCES
CURRENT
SOURCE
MLED
CLED
BAT
BAT
4
up to 5.1V. The part
during the second
BAT
12
11
2
4
5
6
7
to minimize
32101 BD
GND
CPO
MLED1
MLED2
MLED3
MLED4
CLED
32101fd