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参数资料
| 型号： | LT3651EUHE-4.2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PQCC36 |
| 封装： | 5 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-36 |
| 文件页数： | 8/22页 |
| 文件大小： | 213K |
| 代理商： | LT3651EUHE-4.2#PBF |
LT3651-4.1/LT3651-4.2
16
365142fb
Status Pins
The LT3651 reports charger status through two open-
collector outputs, the CHRG and FAULT pins. These pins
can accept voltages as high as VIN, and can sink up to
10mA when enabled.
The CHRG pin indicates that the charger is delivering cur-
rent at greater than a C/10 rate, or one-tenth of the pro-
grammed maximum charge current. The FAULT pin signals
bad battery and NTC faults. These pins are binary coded,
and signal state following the table below. On indicates
the pin pulled low, and Off indicates pin high impedance.
Table 1. Status Pins State Table
STATUS PINS STATE
CHARGER STATUS
CHRG
FAULT
Off
Not Charging—Standby or Shutdown Mode
Off
On
Bad Battery Fault
(Precondition Timeout/EOC Failure)
On
Off
Normal Charging at C/10 or Greater
On
NTC Fault (Pause)
C/10 Termination
The LT3651 supports a low current based termination
scheme, where a battery charge cycle terminates when
the current output from the charger falls to below one-
tenth the maximum current, as programmed with RSENSE.
The C/10 threshold current corresponds to 9mV across
RSENSE. This termination mode is engaged by shorting
the TIMER pin to ground.
When C/10 termination is used, a LT3651 charger will
source battery charge current as long as the average
current level remains above the C/10 threshold. As the
full-charge float voltage is achieved, the charge current
falls until the C/10 threshold is reached, at which time the
charger terminates and the LT3651 enters standby mode.
The CHRG status pin follows the charge cycle and is high
impedance when the charger is not actively charging.
When VBAT drops below 97.5% of the full-charged float
voltage, whether by battery loading or replacement of the
battery, the charger automatically re-engages and starts
charging.
There is no provision for bad battery detection if C/10
termination is used.
Timer Termination
The LT3651 supports a timer-based termination scheme, in
which a battery charge cycle is terminated after a specific
amount of time elapses. Timer termination is engaged
when a capacitor (CTIMER) is connected from the TIMER
pin to ground. The timer cycle end-of-cycle (tEOC) occurs
based on CTIMER following the relation:
CTIMER =
tEOC(Hrs)
3
0.68 μF
()
so a typical 3 hour timer end-of-cycle would use a 0.68μF
capacitor.
The CHRG status pin continues to signal charging at a
C/10 rate, regardless of which termination scheme is
used. When timer termination is used, the CHRG status
pin is pulled low during a charge cycle until the charger
output current falls below the C/10 threshold. The charger
continues to “top off” the battery until timer end-of-cycle,
when the LT3651 terminates the charge cycle and enters
standby mode.
Termination at the end of the timer cycle only occurs if the
charge cycle was successful. A successful charge cycle
occurs when the battery is charged to within 2.5% of the
full-charge float voltage. If a charge cycle is not success-
ful at end-of-cycle, the timer cycle resets and charging
continues for another full-timer cycle.
When VBAT drops below 97.5% of the full-charge float
voltage, whether by battery loading or replacement of the
battery, the charger automatically re-engages and starts
charging.
Precondition and Bad Battery Fault
A LT3651 charger has a precondition mode, in which
charge current is limited to 15% of the programmed IMAX,
as set by RSENSE. The precondition current corresponds
to 14mV across RSENSE.
Precondition mode is engaged while the voltage on the BAT
pin is below the precondition threshold (VBAT(PRE)). Once
the BAT voltage rises above the precondition threshold,
normal full-current charging can commence. The LT3651
incorporates 2.5% of threshold for hysteresis to prevent
mode glitching.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3651EUHE-8.2#PBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651EUHE-8.2#TRPBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651EUHE-8.4#PBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651EUHE-8.4#TRPBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651IUHE-4.1#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 4000mA 4.1V 36-Pin QFN EP 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
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