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参数资料
| 型号： | LTC4151IS-2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SOP-16 |
| 文件页数： | 16/18页 |
| 文件大小： | 476K |
| 代理商： | LTC4151IS-2#PBF |
LTC4151
7
4151fc
BLOCK DIAGRAM
OPERATION
The LTC4151 accurately monitors high side current and
voltages. This device accepts a wide range of input volt-
ages from as low as 7V up to 80V and consumes less
than 1.7mA quiescent current in normal operation. A
shutdown mode is available with the LTC4151 to reduce
the quiescent current to less than 300A by pulling the
SHDN pin below 1V.
In default continuous scan mode after power-up, the
onboard 12-bit analog-to-digital converter (ADC) continu-
ously and sequentially measures the high side differen-
tial voltage between SENSE+ (Kelvin sense of VIN) and
SENSE– (full-scale 81.92mV) through an internal sense
amplifier, the input voltage VIN (full-scale 102.4V) through
an internal voltage divider, and the voltage applied to the
ADIN pin (full-scale 2.048V). The reference voltage of the
ADC is internally set to 2.048V. The digital data obtained
by the ADC is stored in the onboard registers.
In snapshot mode, the LTC4151 can perform on-demand
measurement of a selected voltage without the need of
continuous polling by a master controller. The snapshot
mode is enabled by programming the control register
through the I2C interface. A status bit in the data register
monitors the ADC’s conversion. When the conversion is
completed, the 12-bit digital code of the measured voltage
is held in the corresponding data registers.
TheLTC4151providesanI2CinterfacetoreadtheADCdata
from the data registers and to program the control register.
Two three-state pins, ADR0 and ADR1, are used to decode
nine device addresses (see Table 1). The LTC4151 features
a single SDA pin to handle both input data and output data,
while the LTC4151-1/LTC4151-2 provide separate data in
(SDAI) and data out (SDAO on the LTC4151-1 and SDAO
on the LTC4151-2) pins to facilitate opto-isolation.
SHUTDOWN
CONTROL
4151 BD
6.3V
I2C/
REGISTERS
DECODER
SHDN
(LTC4151)
VIN
5A
2k
RS
VREF = 2.048V
SDA/SDAI
(LTC4151/
LTC4151-1)
ADR1
SCL
SDAO/SDAO
(LTC4151-1/
LTC4151-2)
ADR0
GND
ADIN
15k
735k
INTERNAL
POWER
SENSE+ SENSE–
–
+
6V
12-BIT ADC
MUX
25X
6V
PIN FUNCTIONS
SHDN (LTC4151 Only): Shutdown Input. Internally pulled
up to 6.3V. Pull this pin below 1V to force the LTC4151 into
shutdown mode. Leave this pin open if unused.
VIN: Supply Voltage Input. Accepts 7V to 80V. The voltage
at this pin is monitored by the onboard ADC with a full-
scale input range of 102.4V. SENSE+ must be connected
to VIN for proper ADC readout.
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