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参数资料
| 型号： | LT3513IUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/22页 |
| 文件大小： | 0K |
| 描述： | IC REG 5-OUT FOR TFT-LCD 38QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 30 V |
| 输出数： | 5 |
| 输出电压： | 0.8 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 带卷 (TR) |
LT3513
PIN FUNCTIONS
V C2 (Pin 20): Control Voltage and Compensation Pin for
Internal Error Amplifier. Connect a series RC from this pin
to ground to compensate switching regulator 2.
V C4 (Pin 21): Control Voltage and Compensation Pin for
Internal Error Amplifier. Connect a series RC from this pin
to ground to compensate switching regulator 4.
RUN-SS1 (Pin 22): Run/Soft-Start Pin. This is the soft-start
pin for switching regulator 1. Place a soft-start capacitor
here to limit start-up inrush current and output voltage
ramp rate. When power is applied to the V IN pin, a 2μA
current source charges the capacitor. When the voltage
at this pin reaches 0.8V, switch 1 turns on and begins
switching. For slower start-up use a larger capacitor. For
complete shutdown tie RUN-SS1 to ground.
NFB4 (Pin 23): Negative Feedback Pin. Tie the resistor di-
vider tap to this pin and set V OFF according to V OFF = –1.18 ?
(1 + R3/R4). Reference designators refer to Figure 2.
D4 (Pin 24): Internal Schottky Diode Pin. This pin is the
anode of an internal Schottky diode with the other end
connected to ground. This Schottky diode is used in
generating the V OFF output.
SW4 (Pin 25): Switch Node. The SW4 pin is the collector of
the internal NPN bipolar transistor for switching regulator 4.
Minimize trace area at this pin to keep EMI down.
BD (Note 26): NPN LDO Base Drive. This pin controls the
base of the external NPN LDO transistor.
LDOPWR (Pin 27): Input Voltage for LDO Driver. This pin
supplies the current for the NPN LDO base. This pin can
be connected to V IN . To save power at high V IN voltages,
the pin can alternatively be connected to the AV DD supply.
BOOST (Pin 28): The BOOST pin is used to provide a
drive voltage higher than V IN to the switch 1 drive circuit.
An internal Schottky diode is connected between BIAS
and BOOST. A capacitor needs to be connected between
BOOST and SW1.
SENSE – (Pin 30) Negative Current Sense Input. This pin
(along with the SENSE + pin) is used to sense the inductor
current for the buck switching regulator.
SENSE + (Pin 31) Positive Current Sense Input. This pin
(along with the SENSE – pin) is used to sense the inductor
current for the buck switching regulator.
FB1 (Pin 32): Feedback Pin. Tie the resistor divider tap
to this pin and set V LOGIC according to V LOGIC = 1.235V ?
(1 + R1/R2). Reference designators refer to Figure 2.
SW1 (Pins 34, 35): Switch Node. The SW1 pins are the
emitter of the internal NPN bipolar power transistor for
switching regulator 1. These points must be tied together
for proper operation. Connect these pins to the inductor,
catch diode and boost capacitor.
V IN (Pins 36, 37): Input Voltage. This pin supplies current
to the internal circuitry of the LT3513. This pin must be
locally bypassed with a capacitor.
UVLO (Pin 38): Undervoltage Lockout. A resistor divider
connected to V IN is tied to this pin to program the minimum
input voltage at which the LT3513 will operate. This pin is
compared to the internal 1.25V reference. When UVLO is
less than 1.25V, the switching regulators are not allowed
to operate (the RUN/SS pins are still used to turn on each
switching regulator). When this pin falls below 1.25V,
3.9μA will be pulled from the pin to provide programmable
hysteresis for UVLO.
Exposed Pad (Pin 39): Ground. The Exposed Pad of the
package provides both electrical contact to ground and
good thermal contact to the printed circuit board. The
Exposed Pad must be soldered to the circuit board for
proper operation.
3513fc
9
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