參數(shù)資料
型號： 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
文件頁數(shù)： 2/21頁
文件大?。?/td> 833K
代理商： LM3655TLX
11.0 Charge Control Functions (Continued)
Unless otherwise specified, limits are for Normal Operating range.
Specification
Test Conditions
Min
Typ
Max
Units
Quiescent Current when charge power supply
is detected “I
Q_CHRG”
V
CELL ^ VPUV to VTERMX;VIN = 0; No Load at
Radio B+; CHRG_DETB, CHEMISTRY,
DISABLE, CHRG_STATE and CNTRL pins.
I
DETECT = 300 A;
-
800
A
Low Charge Voltage Threshold “V
CHRG_LOW”
@ T= 25C
Transition from Charge State High to Charge
State Low
2.50
2.575
2.65
V
Low Charge Voltage Threshold V
CHRG_LOW
(normal operating temperature range)
Transition from Charge State High to Charge
State Low
2.475
2.675
V
Maximum Trickle Charge Current
“I
TRICKLE-MAX” @ 25C range (current out of
CELL pin)
V
CELL = 3.5V, IDETECT = 1.250 mA, VPS =6V
190
mA
Maximum Trickle Charge Current
“I
TRICKLE-MAX” - normal operating range
(current out of CELL pin)
V
CELL = 3.5V, IDETECT = 1.250 mA, VPS =6V
150
250
mA
Minimum Trickle Charge Current “I
TRICKLE-MIN”
- normal operating range (current out of CELL
pin)
V
CELL = 3.5V, IDETECT = 12 mA, VPS = 27.5V
20
55
mA
Maximum Sub 2V Charge Current
“I
SUB2V-MAX”- @ 25C (current into VIN pin
and out of CELL pin)
V
CELL = 1.1V, VPS = 6V (For 1V < VCELL
< 2V, I
SUB2V will monotonically increase)
37.5
mA
Maximum Sub 2V Charge Current
“I
SUB2V-MAX” - normal operating range (current
into V
IN pin and out of CELL pin)
V
CELL = 1.1V, VPS = 6V (For 1V < VCELL
< 2V, I
SUB2V will monotonically increase)
12.5
70
mA
Maximum Sub 2V Charge Current
“I
SUB2V-MAX”- @ 25C (current into VIN pin
and out of CELL pin)
V
CELL = 1.8V, VPS = 6V (For 1V < VCELL
< 2V, I
SUB2V will monotonically increase)
37.5
mA
Maximum Sub 2V Charge Current
“I
SUB2V-MAX” - normal operating range (current
into V
IN pin and out of CELL pin)
V
CELL = 1.8V, VPS = 6V (For 1V < VCELL
< 2V, I
SUB2V will monotonically increase)
12.5
70
mA
11.2.5 Full-Rate Charging
Once the cell voltage rises above V
PHONE_ON, the cell will be charged at full-rate unless the cell voltage drops below
V
CHARGE_LOW. The charge power supply will deliver all the charge current it can into the load while the IC is monitoring the power
dissipation of Q1 with the maximum of P
PASS_MAX and the maximum charge current of ICHRG-MAX. Should the power dissipation
of Q1 or the charge current exceed these limits, the IC will revert to trickle charge mode to protect Q1 from over-dissipation.
Q1 is saturated when the charge current is in full-rate and Q1 is operated in linear mode when the charge current is in trickle
charging mode. Because transient loads on Radio B+ (such as when the phone is in its pulsed transmit mode) can cause voltage
transients on the cell pin, it is determined that Q1 is NOT saturated ONLY after the peak detected Q1 emitter voltage minus the
cell pin’s voltage exceeds Q1
UNSAT for a debounce period of 8 ms. This debounce is applied to all uses of Q1UNSAT in the IC.
Q1
UNSAT is the voltage between the cell pin and the emitter of Q1, which corresponds to the voltage drop across M5 and the
saturation drop across Q1.
The CHRG_STATE output pin of the IC will change its state when V
CELL reaches VTERMX. It will not go high because Q1UNSAT
is exceeded.
Unless otherwise noted, the following specifications apply over the Normal Temperature Range.
Specification
Test Conditions
Min
Typ
Max
Units
Charge Control Voltage Threshold “V
TERMX”
“V
TERMX =VTERML” @ 25C
Chemistry Pin LOW
4.065
4.10
4.135
V
“V
TERMX =VTERMH” @ 25C
Chemistry Pin HIGH
4.13
4.16
4.19
V
“V
TERMH”– “VTERML” @ 25C
45
65
80
mW
“V
TERMX =VTERML” 0C to +50C
Chemistry Pin LOW
4.03
4.17
V
“V
TERMX =VTERMH” 0C to +50C
Chemistry Pin HIGH
4.10
4.22
V
“V
TERMX =VTERML” 20C to +70C
Chemistry Pin LOW
3.90
4.25
V
LM3655
www.national.com
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