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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)： | 6/28頁 |
| 文件大小： | 392K |
| 代理商： | LTC4090EDJC#TRPBR |
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LTC4090
14
4090f
OPERATION
To further optimize efciency, the high voltage buck regu-
lator automatically switches to Burst Mode operation in
light load situations. Between bursts, all circuitry associated
with controlling the output switch is shut down reducing
the input supply current.
The oscillator reduces the switch regulator’s operating
frequency when the voltage at the HVOUT pin is low (be-
low 2.95V). This frequency foldback helps to control the
output current during start-up and overload.
The high voltage regulator contains a power good com-
parator which trips when the HVOUT pin is at 2.8V. The PG
output is an open-collector transistor that is off when the
output is in regulation, allowing an external resistor to pull
the PG pin high. Power good is valid when the switching
regulator is enabled and HVIN is above 3.6V.
Ideal Diode From BAT to OUT
The LTC4090 has an internal ideal diode as well as a
controller for an optional external ideal diode. If a battery
is the only power supply available, or if the load current
exceeds the programmed input current limit, then the
battery will automatically deliver power to the load via an
ideal diode circuit between the BAT and OUT pins. The
ideal diode circuit (along with the recommended 4.7μF
capacitor on the OUT pin) allows the LTC4090 to handle
large transient loads and wall adapter or USB VBUS con-
nect/disconnect scenarios without the need for large bulk
capacitors. The ideal diode responds within a few micro-
seconds and prevents the OUT pin voltage from dropping
signicantly below the BAT pin voltage. A comparison of
the I-V curve of the ideal diode and a Schottky diode can
be seen in Figure 3.
If the desired input current increases beyond the pro-
grammed input current limit additional current will be drawn
from the battery via the internal ideal diode. Furthermore,
if power to IN (USB VBUS) or HVIN (high voltage input) is
removed, then all of the application power will be provided
by the battery via the ideal diode. A 4.7μF capacitor at
OUT is sufcient to keep a transition from input power
to battery power from causing signicant output voltage
droop. The ideal diode consists of a precision amplier that
enables a large P-channel MOSFET transistor whenever the
voltage at OUT is approximately 20mV (VFWD) below the
voltage at BAT. The resistance of the internal ideal diode
is approximately 215mΩ.
If this is sufcient for the application then no external
components are necessary. However if more conductance
is needed, an external P-channel MOSFET can be added
from BAT to OUT. The GATE pin of the LTC4090 drives the
gate of the external PFET for automatic ideal diode control.
The source of the external MOSFET should be connected
to OUT and the drain should be connected to BAT. In
order to help protect the external MOSFET in overcurrent
situations, it should be placed in close thermal contact to
the LTC4090.
Figure 2. Input and Battery Currents as a Function of Load Current
IIN
ILOAD(mA)
0
300
400
500
400
500
300
4090 F02a
200
100
200
0
CURRENT
(mA)
ILOAD
IBAT
(CHARGING)
IBAT
(IDEAL DIODE)
IIN
ILOAD(mA)
0
60
80
100
80
100
60
4090 F02b
40
20
40
0
CURRENT
(mA)
ILOAD
IBAT
(CHARGING)
IBAT
(IDEAL DIODE)
ILOAD (mA)
0
300
400
500
400
500
300
4090 F02c
200
100
200
0
CURRENT
(mA)
IIN
ILOAD
IBAT = ICHG
IBAT = ICL = IOUT
IBAT
(CHARGING)
IBAT
(IDEAL DIODE)
(a) High Power Mode/Full Charge
RPROG = 100k and RCLPROG = 2k
(a) Low Power Mode/Full Charge
RPROG = 100k and RCLPROG = 2k
(a) High Power Mode with
ICL = 500mA and ICHG = 250mA
RPROG = 100k and RCLPROG = 2k
Burst Mode is a registered trademark of Linear Technology Corporation
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