参数资料
型号: LT1933HDCB#TRPBF
厂商: Linear Technology
文件页数: 6/20页
文件大小: 0K
描述: IC REG BUCK ADJ 0.6A 6DFN
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: 1.25 V ~ 31.7 V
输入电压: 3.6 V ~ 36 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 600mA
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 6-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 6-DFN-EP(2x3)
LT1933
PIN FUNCTIONS
(SOT-23/DFN)
BOOST (Pin 1): The BOOST pin is used to provide a drive
voltage, higher than the input voltage, to the internal bipolar
NPN power switch.
GND (Pin 2/Pin 5 and Exposed Pad, Pin 7): Tie the
GND pin to a local ground plane below the LT1933 and
the circuit components. Return the feedback divider to
this pin.
FB (Pin 3/Pin 6): The LT1933 regulates its feedback pin to
1.245V. Connect the feedback resistor divider tap to this
pin. Set the output voltage according to V OUT = 1.245V
(1 + R1/R2). A good value for R2 is 10k.
SHDN (Pin 4): The SHDN pin is used to put the LT1933 in
shutdown mode. Tie to ground to shut down the LT1933.
Tie to 2.3V or more for normal operation. If the shutdown
feature is not used, tie this pin to the V IN pin. SHDN also
provides a soft-start function; see the Applications Infor-
mation section.
V IN (Pin 5/Pin 2): The V IN pin supplies current to the
LT1933’s internal regulator and to the internal power
switch. This pin must be locally bypassed.
SW (Pin 6): The SW pin is the output of the internal power
switch. Connect this pin to the inductor, catch diode and
boost capacitor.
BLOCK DIAGRAM
V IN
C2
V IN
INT REG
AND
UVLO
ON OFF
R3
SLOPE
COMP
Σ
R
Q
BOOST
D2
C4
SHDN
OSC
S
Q
DRIVER
Q1
SW
C3
L1
V OUT
FREQUENCY
D1
C1
FOLDBACK
V C
g m
1.245V
GND
R2
FB
R1
1933 BD
1933fe
6
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