參數(shù)資料
型號(hào)： MAX1909ETI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： Multichemistry Battery Charger with Automatic System Power Selector
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, QCC28
封裝： 5 X 5 MM, 0.80 MM HEIGHT, MO-220-WHHD-1, TQFN-28
文件頁(yè)數(shù)： 20/29頁(yè)
文件大?。?/td> 551K
代理商： MAX1909ETI
M
Multichemistry Battery Charger with Automatic
System Power Selector
20
______________________________________________________________________________________
CCV, CCI, CCS, and LVC Control Blocks
The MAX1909 controls charge voltage (CCV control
loop), charge current (CCI control loop), or input
current (CCS control loop), depending on the operating
conditions. The three control loops, CCV, CCI, and CCS,
are brought together internally at the LVC amplifier. The
output of the LVC amplifier is the feedback control
signal for the DC-to-DC controller. The minimum
voltage at CCV, CCI, or CCS appears at the output of
the LVC amplifier and clamps the other two control
loops to within 0.3V above the control point. Clamping
the other two control loops close to the lowest control
loop ensures fast transition with minimal overshoot
when switching between different control loops (see the
Compensation
section).
Continuous Conduction Mode
With sufficient battery current loading, the MAX1909
’
s
inductor current never reaches zero, which is defined
as continuous conduction mode. If the BATT voltage is
within the following range:
3.1V
(number of cells) < V
BATT
< (0.88
V
DCIN
)
The regulator is not in dropout and switches at f
NOM
=
400kHz. The controller starts a new cycle by turning on
the high-side P-channel MOSFET and turning off the
low-side N-channel MOSFET. When the charge current
is greater than the control point (LVC), CCMP goes high
and the off-time is started. The off-time turns off the
high-side P-channel MOSFET and turns on the low-side
N-channel MOSFET. The operating frequency is gov-
erned by the off-time and is dependent upon V
DCIN
and V
BATT
. The off-time is set by the following equation:
where f
NOM
= 400kHz:
These equations describe the controller
’
s pseudo-fixed-
frequency performance over the most common operat-
ing conditions.
At the end of the fixed off-time, the controller can initiate
a new cycle if the control point (LVC) is greater than
0.15V (IMIN = high) and the peak charge current is less
than the cycle-by-cycle limit (IMAX = low). If the charge
current exceeds I
MAX
, the on-time is terminated by the
IMAX comparator.
If during the off-time the inductor current goes to zero,
ZCMP = high, both the high- and low-side MOSFETs
are turned off until another cycle is ready to begin. This
condition is discontinuous conduction. See the
Discontinuous Conduction
section.
There is a minimum 0.3ms off-time when the (V
DCIN
-
V
BATT
) differential becomes too small. If V
BATT
≥
0.88 x
V
DCIN
, then the threshold for minimum off-time is
reached and the t
OFF
is fixed at 0.3ms. The switching
frequency in this mode varies according to the equation:
Discontinuous Conduction
The MAX1909 enters discontinuous conduction mode
when the output of the LVC control point falls below
0.15V. For RS2 = 0.015
, this corresponds to 0.5A:
0 15
20
where RS2 = 0.015
.
In discontinuous mode, a new cycle is not started until
the LVC voltage rises above 0.15V. Discontinuous
mode operation can occur during conditioning charge
of overdischarged battery packs, when the charge cur-
rent has been reduced sufficiently by the CCS control
loop, or when the charger is in constant voltage mode
with a nearly full battery pack.
Compensation
The charge voltage, charge current, and input current-
limit regulation loops are compensated separately and
independently at the CCV, CCI, and CCS pins.
CCV Loop Compensation
The simplified schematic in Figure 5 is sufficient to
describe the operation of the MAX1909 when the
voltage loop (CCV) is in control. The required compensa-
tion network is a pole-zero pair formed with C
CV
and
R
CV
. The pole is necessary to roll off the voltage loop
’
s
response at low frequency. The zero is necessary to
compensate the pole formed by the output capacitor and
the load. R
ESR
is the equivalent series resistance (ESR)
of the charger output capacitor (C
OUT
). R
L
is the equiva-
lent charger output load, where R
L
=
V
BATT
/
I
CHG
.
I
V
RS
A
MIN
=
×
=
2
0 5
.
.
f
L I
V
V
s
RIPPLE
CSSN
BATT
=
+
μ
1
0.
(
)
f
t
t
ON
OFF
=
+
1
where I
V
t
L
RIPPLE
BATT
OFF
=
×
t
L I
V
V
ON
RIPPLE
CSSN
BATT
=
t
f
V
V
V
OFF
NOM
CSSN
BATT
CSSN
=
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1909ETI+ 功能描述:電池管理 Multichemistry Battery Chargers RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1909ETI+T 功能描述:電池管理 Multichemistry Battery Chargers RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1909ETI-T 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1909EVKIT 功能描述:電池管理 Evaluation Kit for the MAX1909 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX190ACNG 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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