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參數(shù)資料
| 型號： | LTC4090EDJC#TRPBR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO22 |
| 封裝： | 6 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WXXX, DFN-22 |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 392K |
| 代理商： | LTC4090EDJC#TRPBR |
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LTC4090
10
4090f
CLPROG (Pin 14): Current Limit Program and Input Cur-
rent Monitor. Connecting a resistor, RCLPROG, to ground
programs the input to output current limit. The current
limit is programmed as follows:
IA
V
R
CL
CLPROG
()
=
1000
In USB applications, the resistor RCLPROG should be set
to no less than 2.1k. The voltage on the CLPROG pin is
always proportional to the current owing through the
IN to OUT power path. This current can be calculated as
follows:
IA
V
R
IN
CLPROG
()
=
1000
HPWR (Pin 15): High Power Select. This logic input is used
to control the input current limit. A voltage greater than
1.2V on the pin will set the input current limit to 100% of
the current programmed by the CLPROG pin. A voltage
less than 0.4V on the pin will set the input current limit to
20% of the current programmed by the CLPROG pin. A
2μA pull-down current is internally connected to this pin
to ensure it is low at power up when the pin is not being
driven externally.
SUSP (Pin 16): Suspend Mode Input. Pulling this pin
above 1.2V will disable the power path from IN to OUT.
The supply current from IN will be reduced to comply
with the USB specication for suspend mode. Both the
ability to charge the battery from HVIN and the ideal diode
function (from BAT to OUT) will remain active. Suspend
mode will reset the charge timer if OUT is less than BAT
while in suspend mode. If OUT is kept greater than BAT,
such as when the high voltage input is present, the charge
timer will not be reset when the part is put in suspend. A
2μA pull-down current is internally connected to this pin
to ensure it is low at power up when the pin is not being
driven externally.
TIMER (Pin 17): Timer Capacitor. Placing a capacitor,
CTIMER, to GND sets the timer period. The timer period
is:
t
hours
C
R
hours
F
k
TIMER
PROG
()
.
=
3
0 1
100
Charge time is increased if charge current is reduced
due to load current, thermal regulation and current limit
selection (HPWR low).
Shorting the TIMER pin to GND disables the battery
charging functions.
HVOUT (Pin 18): Voltage Output of the High Voltage
Regulator. When sufcient voltage is present at HVOUT,
the low voltage power path from IN to OUT will be discon-
nected and the HVPR pin will be pulled low to indicate
that a high voltage wall adapter has been detected. The
LTC4090 high voltage regulator will maintain just enough
differential voltage between HVOUT and BAT to keep the
battery charger MOSFET out of dropout (typically 300mV
from OUT to BAT). HVOUT should be bypassed with at
least 22μF to GND.
BOOST (Pin 19): This pin is used to provide drive voltage,
higher than the input voltage, to the internal bipolar NPN
power switch.
SW (Pin 20): The SW pin is the output of the internal high
voltage power switch. Connect this pin to the inductor,
catch diode and boost capacitor.
HVIN (Pin 21): High Voltage Regulator Input. The HVIN pin
supplies current to the internal high voltage regulation and
to the internal high voltage power switch. The presence
of a high voltage input takes priority over the USB VBUS
input (i.e., when a high voltage input supply is detected,
the USB IN to OUT path is disconnected). This pin must
be locally bypassed.
HVEN (Pin 22): High Voltage Regulator Enable Input. The
HVEN pin is used to disable the high voltage input path.
Tie to ground to disable the high voltage input or tie to at
least 2.3V to enable the high voltage path. If this feature
is not used, tie HVEN to the HVIN pin. This pin can also
be used to soft-start the high voltage regulator; see the
Applications Information section for more information.
Exposed Pad (Pin 23): Ground. The exposed package
pad is ground and must be soldered to the PC board for
proper functionality and for maximum heat transfer (use
several vias directly under the LTC4090).
PIN FUNCTIONS
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