参数资料
型号: LTC1772BES6#TR
厂商: Linear Technology
文件页数: 5/16页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM SOT23-6
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 650kHz
占空比: 100%
电源电压: 2.5 V ~ 9.8 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: SOT-23-6 细型,TSOT-23-6
包装: 带卷 (TR)
其它名称: LTC1772BES6TR
LTC1772B
PIN FUNCTIONS
I TH /RUN (Pin 1): This pin performs two functions. It
serves as the error ampli?er compensation point as well
as the run control input. Nominal voltage range for this
pin is 0.85V to 1.9V. Forcing this pin below 0.35V causes
the device to be shut down. In shutdown all functions are
disabled and the PGATE pin is held high.
GND (Pin 2): Ground Pin.
V FB (Pin 3): Receives the feedback voltage from an external
resistive divider across the output.
FUNCTIONAL DIAGRAM
SENSE – (Pin 4): The Negative Input to the Current Com-
parator.
V IN (Pin 5): Supply Pin. Must be closely decoupled to
GND Pin 2.
PGATE (Pin 6): Gate Drive for the External P-channel
MOSFET. This pin swings from 0V to V IN .
V IN
5
SENSE –
4
+
15mV
ICMP
OSC
FREQ
FOLDBACK
SLOPE
COMP
0.3V
RS1
R
Q
S
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
OVP
+
V IN
PGATE
6
SHORT-CIRCUIT
DETECT
0.5μA
EAMP
+
V REF
+
60mV
V REF
0.8V
V FB
+
V IN
1 I TH /RUN
V IN
3
VOLTAGE
REFERENCE
V REF
0.8V
0.35V
+
SHDN
CMP
SHDN
GND
2
UNDERVOLTAGE
LOCKOUT
UV
1.2V
1772FD
1772bfa
5
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