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參數(shù)資料
| 型號(hào)： | LT1505CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Constant-Current/Voltage High Efficiency Battery Charger |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO28 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-28 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 214K |
| 代理商： | LT1505CG |
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12
LT1505
APPLICATIO
S I
FOR
ATIO
U
This is accomplished by sensing total adapter output
current and adjusting charge current downward if a preset
adapter current limit is exceeded. True analog control is
used, with closed loop feedback ensuring that adapter load
current remains within limits. Amplifier CL1 in Figure 2
senses the voltage across R
S4
, connected between the
CLP and CLN pins. When this voltage exceeds 92mV, the
amplifier will override programmed charge current to limit
adapter current to 92mV/R
S4
. A lowpass filter formed by
500
and 1
μ
F is required to eliminate switching noise. If
the current limit is not used, then the R7 /C1 filter and the
COMP1 (R1/C7) compensation networks are not needed,
and both CLP and CLN pins should be connected to V
CC
.
W
U
U
Charge Current Programming
The basic formula for charge current is (see Block
Diagram):
(
I
BAT
= I
PROG S2
= 2.465V
S1
R
PROG
R
S2
R
S1
)(
)
(
)
where R
PROG
is the total resistance from PROG pin to ground.
For the sense amplifier CA1 biasing purpose, R
S3
should
have the same value as R
S2
and SPIN should be connected
directly to the sense resistor (R
S1
) as shown in the Block
Diagram.
For example, 4A charging current is needed. For low power
dissipation on R
S1
and enough signal to drive the amplifier
CA1, let R
S1
= 100mV/4A = 0.025
. This limits R
S1
power
to 0.4W. Let R
PROG
= 5k, then:
R
S2
= R
S3
=
=
= 200
(I
BAT
)(R
PROG
)(R
S1
)
2.465V
(4A)(5k)(0.025)
2.465V
Charge current can also be programmed by pulse width
modulating I
PROG
with a switch Q1 to R
PROG
at a frequency
higher than a few kHz (Figure 3). Charge current will be
proportional to the duty cycle of the switch with full current
at 100% duty cycle.
When a microprocessor DAC output is used to control
charge current, it must be capable of sinking current at a
compliance up to 2.5V if connected directly to the PROG
pin.
Lithium-Ion Charging
The 4A Lithium Battery Charger (Figure 1) charges lithium-
ion batteries at a constant 4A until battery voltage reaches
the preset value. The charger will then automatically go
into a constant-voltage mode with current decreasing to
near zero over time as the battery reaches full charge.
Preset Battery Voltage Settings
The LT1505 provides four preset battery voltages: 12.3V,
12.6V, 16.4V and 16.8V. See the Pin Functions section for
pin setting voltage selection. An internal switch connects
the resistor dividers to the battery sense pin, BAT2. When
shutting down the LT1505 by removing adaptor power or
by pulling the SHDN pin low, the resistor dividers will be
disconnected and will not drain the battery. The BAT2 pin
should be connected to the battery when any of the preset
battery voltages are used.
External Battery Voltage Setting Resistors
When an external divider is used for other battery voltages,
BAT2 should be grounded. Pins 4.1V, 4.2V and 3CELL
should be left floating. To minimize battery drain when the
charger is off, current through the R3/R4 divider (Figure 4)
is set at 15
μ
A . The input current to the V
FB
pin is 3nA and
the error can be neglected.
PWM
R
4.7k
PROG
C
PROG
1
μ
Q1
VN2222
5V
0V
LT1505
1505 F03
I
BAT
= (DC)(4A)
Figure 3. PWM Current Programming
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| LT1505CG#TRPBF | 功能描述:IC BATT CHARGER CONST I/V 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
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