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参数资料
| 型号： | LTC4012IUF-2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 5/28页 |
| 文件大小： | 381K |
| 代理商： | LTC4012IUF-2#PBF |
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4012fa
LTC4012/
LTC4012-1/LTC4012-2
the end of soft-start will depend on which loop (current,
voltage or adapter limit) is in control of the PWM. If this
currentisbelowthatrequiredbytheITHstart-upthreshold,
theresultingchargecurrenttransientdurationdependson
loop compensation but is typically less than 100s.
Bulk Charge
When soft-start is complete, the LTC4012 begins sourc-
ing the current programmed by the external components
connected to CSP, CSN and PROG. Some batteries may
requireasmallconditioningtricklecurrentiftheyareheav-
ily discharged. As shown in the Applications Information
section,theLT4012canaddressthisneedthroughavariety
of low current circuit techniques on the PROG pin. Once
a suitable cell voltage has been reached, charge current
can be switched to a higher, bulk charge value.
End of Charge and CHRG Output
As the battery approaches the programmed output volt-
age, charge current will begin to decrease. The open-drain
CHRG output can indicate when the current drops to 10%
ofitsprogrammedfull-scalevaluebyturningoffthestrong
pull-down (open-drain FET) and turning on a weak 25A
pull-down current. This weak pull-down state is latched
until the part enters shutdown or the sensed current rises
to roughly C/6. C/10 indication will not be set if charge
current has been reduced due to adapter input current
limiting. As the charge current approaches 0A, the PWM
continues to operate in full continuous mode. This avoids
generation of audible noise, allowing bulk ceramic capaci-
tors to be used in the application.
Charge Current Monitoring
WhentheLTC4012ischarging,thevoltageonthePROGpin
varies in direct proportion to the charge current. Referring
to Figure 1, the nominal PROG voltage is given by
V
I
R
A R
PROG
CHRG
SENSE
PROG
IN
PROG
=
+
.
11 67
Voltage tolerance on PROG is limited by the charge current
accuracy specified in the Electrical Characteristics table.
Refer to the Applications Information section on program-
ming charge current for additional details.
operation
Figure 1. PWM Circuit Diagram
–
+
–
+
EA
CA
–
+
CC
19
2
11
PWM
LOGIC
OSCILLATOR
WATCHDOG
TIMER
LOOP
COMPENSATION
TGATE
SYSTEM
POWER
L1
RIN
+
–
16
BGATE
15
CSP
14
CSN
13
PROG
9
VFB
12
ITH
RPROG
R1
FROM ICL
1.2085V
RSENSE
VSENSE
ICHRG
4012 F01
CPROG
Q
S
CLOCK
LTC4012
CLP
BAT
RD
RIN
+
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