参数资料
型号: LT8415IDDB#TRPBF
厂商: Linear Technology
文件页数: 6/12页
文件大小: 0K
描述: IC REG BOOST ADJ 25MA 12DFN
标准包装: 2,500
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 2.5 V ~ 40 V
输入电压: 2.5 V ~ 16 V
PWM 型: 电流模式
频率 - 开关: 800kHz
电流 - 输出: 25mA
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: 12-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 12-DFN-EP(3x2)
LT8415
PIN FUNCTIONS
SHDN (Pin 1): Shutdown Pin. This pin is used to enable/dis-
able the chip. Drive below 0.3V to disable the chip. Drive
above 1.4V to activate the chip. Do not ?oat this pin.
V CC (Pin 2): Input Supply Pin. Must be locally bypassed
to GND. See typical applications section.
GND (Pin 3 and Pin 13): Ground. Tie directly to local
ground plane. Pin 13 is ?oating but must be grounded
for proper shielding.
SW (Pin 4): Switch Pin. This is the collector of the internal
NPN power switch. Minimize the metal trace area connected
to this pin to minimize EMI.
IN1 (Pin 5): First Half-Bridge Control Input. Do not ?oat
this pin.
IN2 (Pin 6): Second Half-Bridge Control Input. Do not
?oat this pin.
OUT2 (Pin 7): Second Half-Bridge Output. This pin is
controlled in phase by the voltage on IN2. The output level
is either the voltage on V OUT or GND.
OUT1 (Pin 8): First Half-Bridge Output. This pin is controlled
in phase by the voltage on IN1. The output level is either
the voltage on V OUT or GND.
BLOCK DIAGRAM
V OUT (Pin 9): Drain of Output Disconnect PMOS. Place a
bypass capacitor from this pin to GND.
CAP (Pin 10): This is the Cathode of the Internal Schottky
Diode. Place a bypass capacitor from this pin to GND.
V REF (Pin 11): Reference Pin. Soft start can be achieved
by placing a capacitor from this pin to GND. This cap
will be discharged for 70μs (typical) at the beginning
of start-up and then be charged to 1.235V with a 10μA
current source.
FBP(Pin 12): Positive Feedback Pin. This pin is the error
ampli?er’s positive input terminal. To achieve the desired
output voltage, choose the FBP pin voltage (V FBP ) accord-
ing to the following formula:
V FBP = V OUT /31.85
When resistor divider from the V REF is used to set the FBP
voltage, choose the resistor divider ratio according to the
following formula:
R1/R2 = (39.33 – V OUT )/V OUT
For protection purposes, the output voltage can not exceed
40V even if V FBP is driven higher than V REF .
V CC
2
SHDN
1
V OUT
9
CAP
10
SW
4
OUT1
8
OUT2
7
MAX
ENABLE
CHIP
V OUT
10μA
+
1.235V
12.4M
TOP GATE
CONTROL
+
V REF
11
1.235V
400K
OUTPUT DISCONNECT
CONTROL
BOTTOM GATE
CONTROL
DISCHARGE
R 1
CONTROL
TIMING AND PEAK
CURRENT CONTROL
SWITCH
CONTROL
V OUT
TOP GATE
FB
CONTROL
FBP
R 2
12
1.235V
VC
+
BOTTOM GATE
CONTROL
13
3
5
6
GND
GND IN1
IN2
8415 BD
8415f
6
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