參數(shù)資料
型號(hào)： LM3655TLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25
封裝： 2.5 X 2.5 MM, MICRO SMD, 25 PIN
文件頁(yè)數(shù)： 3/21頁(yè)
文件大?。?/td> 833K
代理商： LM3655TLX
11.0 Charge Control Functions (Continued)
Unless otherwise noted, the following specifications apply over the Normal Temperature Range.
Specification
Test Conditions
Min
Typ
Max
Units
“V
TERMX =VTERMH” 20C to +70C
Chemistry Pin HIGH
3.90
4.25
V
Q1 Unsaturated Threshold “Q
1UNSAT”
@ 25C
550
-
795
mW
Over Normal Temperature Range
550
-
795
mW
“V
PHONE_ON” at CELL Pin
Cell voltage at which phone is operational
2.88
3.00
3.12
V
Maximum Full Rate Current “I
CHRG-MAX”
@ 25C
1.0
1.2
1.4
A
Over Normal Temperature Range
1.0
1.2
1.4
A
Maximum Power Dissipation of Pass
Transistor
For R
4A +R4B =2k
“P
PASS_MAX”VPS –VCELL =5Vto22V
@ 25C
530
650
800
mW
@ 20C
530
650
880
mW
@ +70C
475
650
800
mW
11.2.6 Trickle/Top-Off Mode
After the full-rate charge is completed and the cell is charged to V
TERMX, the current will be reduced to the trickle charge current.
The pass transistor Q1 will no longer be in saturation and will now operate in linear mode. The maximum trickle current is
I
TRICKLE_MAX unless the power dissipation of Q1 exceeds PPASS_MAX. If the power dissipation of Q1 exceeds PPASS_MAX, the
trickle current will be further reduced until the power dissipation of Q1 is less than or equal to P
PASS_MAX.
During the transition from full-rate to trickle charge, the voltage of the cell will relax (IR drop due to cell internal impedance), but
the cell will again eventually be charged up again to V
TERMX. While the LM3655 allows the trickle current continue to flow to the
cell, it will constantly monitor the cell voltage not to exceed V
TERMX. The IC will maintain the cell voltage at VTERMX by gradually
reducing the trickle current, and eventually no charge current will flow into the cell.
The charge rate between V
SUV and VCHARGE_LOW is limited to the lowest setting of the Trickle charge range (ITRICKLEMIN). Once
V
CHARGE_LOW is reached, the trickle charger will remain charging but can use the full range of trickle charge, from ITRICKLEMIN to
I
TRICKLEMAX.
11.2.7 Peak Detector Function
The LM3655 device uses two independent peak detector circuits. One is used for filtering the ripple from the input power supply,
and the other for minimizing the IR drop of the cell voltage during transmit pulses (if the phone is operated while connected to a
charger). The peak detector circuits allow the device to be less sensitive to the ripple-induced noise that could unintentionally
trigger the internal circuit thresholds of the IC.
The peak detector circuit for smoothing the power supply ripple has its input connected across to the emitter of Q1 to CELL for
monitoring Q1 V
CE voltage and voltage across M5. The filtered voltage from the peak detector is used by the circuit that regulates
the power of the external PNP pass transistor Q1. The power limiting circuit determines the maximum charge current such that
the maximum power dissipation of Q1 [(Q1 V
CE +Ma5)* Ic] is lways at PPASS_MAX.
The peak detector for the cell voltage is used to smooth the sensed values for cell voltage drop during the transmit pulses. The
peak detector is in essence a digital filter with transient response characteristics as outlined below. Two parameters are
associated with the peak detector, decay rate and attack rate. Figure 4 a) and b) below show the decay and attack rates of the
power supply ripples and for the transmit pulses on the cell (output) voltage respectively. The typical input voltage filter decay and
attack rates are respectively 5.0 ms and 15.6 s. The typical output voltage filter decay and attack rates are respectively 4 mV/ms
and 1.4V/ms.
LM3655
www.national.com
11
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