LT3513 LINER [Linear Technology], LT3513 Datasheet - Page 7

• Manufacturer Part Number: LT3513
• Description: 2MHz High Current 5-Output Regulator for TFT-LCD Panels
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
FB5 (Pin 1): Feedback Pin. Tie the resistor tap to this pin
and set the output of the LDO according to V
(1 + R14/R15). Reference designators refer to Figure 1.
V
Internal Error Amplifi er. Connect a series RC from this pin
to ground to compensate switching regulator 1.
RUN-SS3/4 (Pin 3): Run/Soft-Start Pin. This is the soft-
start pin for switching regulators 3 and 4. Place a soft-start
capacitor here to limit start-up inrush current and output
voltage ramp rate. When the BIAS pin reaches 2.8V, a 2μA
current source charges the capacitor. When the voltage at
this pin reaches 0.8V, switches 3 and 4 turn on and begin
switching. For slower start-up use a larger capacitor. For
complete shutdown tie RUN-SS3/4 to ground.
FB3 (Pin 4): Feedback Pin. Tie the resistor tap to this
pin and set V
– 150mV. Reference designators refer to Figure 1.
RUN-SS2 (Pin 5): Run/Soft-Start Pin. This is the soft-start
pin for switching regulator 2. Place a soft-start capacitor
here to limit start-up inrush current and output voltage
ramp rate. When the BIAS pin reaches 2.25V, a 2μA cur-
rent source charges the capacitor. When the voltage at this
pin reaches 0.8V, switch 2 turns on and begins switching.
C1
9
8
7
6
5
4
3
2
1
0
(Pin 2): Control Voltage and Compensation Pin for
–50
LDO Current Limit vs Temperature
–25
AMBIENT TEMPERATURE (°C)
ON
0
according to V
25
50
75
100
ON
3513 G19
125
= 1.23V • (1 + R8/R9)
1.33
1.27
1.26
1.32
1.31
1.30
1.29
1.28
LDO
–50
V
UVLO
= 0.625 •
AMBIENT TEMPERATURE ( C)
vs Temperature
0
UVLO FOR
START
For slower start-up use a larger capacitor. For complete
shutdown tie RUN-SS2 to ground.
SW3 (Pin 6): Switch Node. The SW3 pin is the collector of
the internal NPN bipolar transistor for switching regulator
3. Minimize trace area at this pin to keep EMI down.
E3 (Pin 7): This is switching regulator 3’s output and
the emitter of the output disconnect PNP . Tie the output
capacitor and resistor divider here.
V
regulator 3. V
internal C
V
10% below normal voltage. This output is also disabled
when V
V
trolled by the V
pin draws no current and when V
draws current.
V
device and the open collector of V
low, the V
impedance. When this pin is high, the V
and the V
50
ON
ON
ONSINK
ON_CLK
UVLO MINIMUM
is disabled if any of the four outputs are more than
(Pin 8): This is the delayed output for switching
FOR RUN
ON_CLK
(Pin 10): This pin controls the output disconnect
(Pin 9): This is an open-collector output con-
100
ONSINK
T
ON
3513 G20
timer times out. Protection circuitry ensures
T
A
pin is enabled and the V
ON
= 25°C, unless otherwise noted.
is high.
reaches its programmed voltage after the
ON_CLK
pin sinks current to ground.
670
660
650
640
630
620
610
600
pin. When V
–40
Reference Voltage for FB5, LDO
–15
ONSINK
ON_CLK
10
TEMPERATURE (°C)
ONSINK
ON_CLK
ON
35
. When this pin is
is high, this pin
pin is disabled
LT3513
60
pin is a high
is low, this
85
3513fa
110
7
3513 G21