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參數(shù)資料
| 型號(hào)： | LTC3456EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | ECONOLINE: RSZ/P - 1kVDC |
| 中文描述： | 0.9 A BATTERY CHARGE CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大小： | 358K |
| 代理商： | LTC3456EUF |
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19
LTC3456
3456f
VOLTAGE MONITORS
Low-Battery Detection
The LTC3456 has an on-chip gain block that can be used
for low-battery detection. The low-battery trip point can be
set by two resistors (Figure 10). The nominal voltage at
AIN is 0.8V. If the voltage at AIN falls below 0.8V, AO sinks
current to ground.
The battery minimum voltage can be set according to the
formula:
R
R
1
The AIN input bias current is quite low, on the order of 2nA
(typ). Large resistor values (R2 ~ 100k) can be used in the
divider network. This helps in minimizing the loading on
the battery. AO is an open-drain logic output. The voltage
at AIN must always be kept less than 2V. If the gain block
is not used then connect AIN to ground.
There is no built-in hysteresis in the gain block. Hysteresis
can be added by connecting resistor R4 from AIN to AO as
shown in Figure 10. Ensure that R4
10R3 for correct
operation. With the values shown in Figure 10b, the circuit
has 180mV of hysteresis.
V
V
BATT MIN
(
)
.
=
+
0 8
1
2
Figure 10. Low-Battery Detector (10a) and
Low-Battery Detector with Hysteresis (10b)
Figure 11. Generating Auxiliary Voltage Supply
(10b)
V
CORE
R4
1M
R3
100k
3456 F10
R2
100k
R1
80.6k
V
BATT
LTC3456
AIN
AO
(10a)
V
CORE
R3
100k
R2
100k
R1
80.6k
V
1.8V TO 3.2V
LTC3456
AIN
AO
100k
2.2
μ
F
V
3.3V
20.5k
43.2k
3456 F11
V
2.5V
20mA
Q1
PHILIPS
MMBT3906
LTC3456
AIN
AO
The gain block can be configured to drive an external PNP
transistor and generate an auxiliary voltage as shown in
Figure 11. An auxiliary output voltage 2.5V/20mA is gen-
erated from the V
MAIN
(3.3V) power supply.
External Power Detection
The LTC3456 has an EXT_PWR output pin to indicate the
presence of USB or wall power. Whenever the WALLFB pin
is pulled higher than 1.25V (AC adapter present), or the
USB input is greater than 4V and the SUSPEND pin is low
(USB power available), the EXT_PWR pin is pulled to
ground. When pulled low, this pin is capable of sinking
5mA suitable for driving an external LED. Otherwise, this
pin is in a high impedance state.
Overtemperature Protection
The maximum allowable junction temperature for LTC3456
is 125
°
C. In normal operation, the IC does not dissipate
much heat and its junction temperature stays well below
125
°
C at an ambient temperature of 85
°
C or less. If the
junction temperature exceeds 150
°
C, the Core, Main and
Hot Swap outputs are turned off and RESET is pulled low.
The V
INT
output stays alive in this state. The Core and Main
outputs will remain off until the die temperature falls below
150
°
C, regardless of the state of the PWRKEY and PWRON
inputs.
OPERATIOU
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