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參數(shù)資料
| 型號： | SC804AMLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer |
| 中文描述： | 完全集成的4.4V鋰離子電池充電器系統(tǒng)的計時器 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 550K |
| 代理商： | SC804AMLTRT |
13
2005 Semtech Corp.
www.semtech.com
SC804A
PRELIMINARY
POWER MANAGEMENT
DRAFT
The actual dropout voltage is the greater of the Minimum Dropout
Voltage at various programmed V
CV and instantaneous VOUT
voltages (shown here, with several programmed V
CV voltages
indicated in the gure by ‘o’), and the IR drop due to the product
of IOUT and R
DS-ON (not shown here).
Adjust mode operation is
ensured for any IOUT current at programmed V
CV voltages up to
approximately 4.41V.
Applications Information (Cont.)
FLAG
ON
OFF
CPB
UVLO < VCC < OVP
Input out of range
CHRGB
IOUT > ITERM
IOUT < ITERM
OVPB
VCC > OVP
VCC < OVP
FLTB
VCC > OVP
VCC UVLO
NTC Temp Fault
Pre-Charge Time-out
(OT (Tj > 150°C)
Normal Operation or
NTC Disable
NOTE: When using Adjust Mode to program a CV regulation
voltage greater than V
CV, care must be taken when CC
charging with a charging adapter operating in current
limit.
Adapter current-limited operation occurs when
the adapter current limit is less than the programmed
SC804A fast charge current, such that the adapter voltage
is pulled down to V
VOUT plus the SC804A dropout voltage.
A low adapter current limit multiplied by the low minimum
path resistance of the main pass transistor and current
sense resistor (as low as 290m
Ω total at extremely low
temperature) can result in a voltage drop from VCC to
VOUT of less than 150mV if the Adjust Mode CV regulation
voltage is programmed above V
CV + 50mV. If VVCC - VVOUT
< 150mV, Adjust Mode may not operate correctly. Adjust
Mode will operate correctly whenever the programmed
VOUT CV voltage is less than V
CV + 50mV, regardless of the
adapter current limit, because the regulated minimum
dropout voltage is always greater than 150mV in this
case. It will also operate correctly with an adapter current
limit greater than 550 mA, regardless of the programmed
output voltage, because the I-R dropout voltage will
exceed 150mV at even the lowest specied operating
temperature. Normal mode (that is, not Adjust Mode) has
a regulated minimum dropout voltage of approximately
200mV, which is constant for any V
VOUT, and so operates
correctly for any adapter current limit.
Overcurrent and Max Temperature Protection
Overcurrent protection is inherent in all modes of operation.
When the device is in charge mode the output is current-
limited to either the pre-charge current limit value or the
fast charge current limit value depending on the voltage
at the output. Max die temperature protection is also
included. This feature allows the SC804A to operate
with maximum power dissipation by disabling the output
current when the die temperature reaches the maximum
operating temperature. The result is that the SC804A will
operate as a pulse charger in extreme power dissipation
applications, delivering the maximum allowable output
current while regulating the internal die temperature to a
safe level.
Indicator Flags
There are four indicator outputs/LED drivers ont he
SC804A; CPB (Charger Present), CHRGB (Charge Active),
OVPB (Over Voltage Fault), and FLTB (Fault). These outputs
are all active-low; open drain NMOS drivers capable of
sinking up to 10mA. The following table denes each
indicator’s output state.
The CPB output can be used as a VCC-present indicator.
Regardless of teh state of NTC, the CPB output reects
the VCC voltage. When V
CC is between the UVLO and OVP
thresholds the CPB output is low. If V
CC is outside these
limits, this output is high impedance.
The CHRGB output indicates the charging status. When
the output current is greater than ITERM, CHRGB is low.
CHRGB is high impedance when IOUT is less than ITERM.
The CHRGB output is latched during the charge cycle
when the output current is less than ITERM. This latch is
reset when the battery enters a recharge cycle, or if NTC
or VCC are toggled.
3.2
3.4
3.6
3.8
4
4.2
4.4
4.6
0.2
0.4
0.6
0.8
Output voltage, V
Minimum
dropout
voltage,
V
Figure 4 - Adjust Mode Minimum Dropout Voltage
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC804EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer |
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| SC804IMLTRT | 制造商:Semtech Corporation 功能描述:Battery Charger Li-Ion 1500mA 4.2V 16-Pin MLPQ EP T/R |
| SC805 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
| SC805A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
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