参数资料
型号: LT1938EDD#TRPBF
厂商: Linear Technology
文件页数: 7/24页
文件大小: 0K
描述: IC REG BUCK ADJ 2.2A 10DFN
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.27 V ~ 20 V
输入电压: 3.6 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 300kHz ~ 2.8MHz
电流 - 输出: 2.2A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-DFN(3x3)

LT1938
PIN FUNCTIONS
BD (Pin 1): This pin connects to the anode of the boost
Schottky diode.
BOOST (Pin 2): This pin is used to provide a drive
voltage, higher than the input voltage, to the internal bipolar
NPN power switch.
SW (Pin 3): The SW pin is the output of the internal power
switch. Connect this pin to the inductor, catch diode and
boost capacitor.
V IN (Pin 4): The V IN pin supplies current to the LT1938’s
internal regulator and to the internal power switch. This
pin must be locally bypassed.
RUN/SS (Pin 5): The RUN/SS pin is used to put the
LT1938 in shutdown mode. Tie to ground to shut down
the LT1938. Tie to 2.3V or more for normal operation. If
the shutdown feature is not used, tie this pin to the V IN
pin. RUN/SS also provides a soft-start function; see the
Applications Information section.
PG (Pin 6): The PG pin is the open collector output of an
internal comparator. PG remains low until the FB pin is
within 10% of the final regulation voltage. PG output is
valid when V IN is above 3.5V and RUN/SS is high.
BIAS (Pin 7): The BIAS pin supplies the current to the
LT1938’s internal regulator. Tie this pin to the lowest
available voltage source above 3V (typically V OUT ). This
architecture increases efficiency especially when the input
voltage is much higher than the output.
FB (Pin 8): The LT1938 regulates the FB pin to 1.265V.
Connect the feedback resistor divider tap to this pin.
V C (Pin 9): The V C pin is the output of the internal error
amplifier. The voltage on this pin controls the peak switch
current. Tie an RC network from this pin to ground to
compensate the control loop.
RT (Pin 10): Oscillator Resistor Input. Connecting a resistor
to ground from this pin sets the switching frequency.
Exposed Pad (Pin 11): Ground. The Exposed Pad must
be soldered to the PCB.
1938fa
7
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