參數(shù)資料
型號： LTC4425IMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-12
文件頁數(shù)： 14/20頁
文件大?。?/td> 239K
代理商： LTC4425IMSE#TRPBF
LTC4425
3
4425f
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
junction temperature range, otherwise specications are at TA = 25°C, VIN = 3.8V. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Operating Supply Range
l
2.7
5.5
V
IQ(IN)
Quiescent Current from VIN
VIN = VOUT
20
μA
IQ(OUT)
Quiescent Current from VOUT
VIN = VOUT
3μA
ISD
Quiescent Current in Shutdown
EN = 0
3
μA
Ideal Diode
VFWD
Forward Voltage
15
mV
RFWD
Open Loop Forward On-Resistance
50
mΩ
Supercap Charger
VFB
Feedback Voltage
l
1.18
1.2
1.22
V
IFB
Feedback Pin Input Leakage
100
nA
ICHG
Charge Current in LDO Mode
(FB = 0V)
RPROG = 0.5k
RPROG = 5k
2
0.2
A
Charge Current in Normal Mode (FB = VIN)RPROG = 0.5k, VIN – VOUT < 250mV
RPROG = 0.5k, VIN – VOUT > 750mV
2
0.2
A
RPROG = 5k, VIN – VOUT < 250mV
RPROG = 5k, VIN – VOUT > 750mV
200
20
mA
VPROG
PROG Pin Servo Voltage in LDO Mode
FB < 1.2V
1.00
V
hPROG
Ratio of Charge Current to PROG Pin Current
1000
mA/mA
VPROG
PROG Pin Servo Voltage in Normal Mode (FB = VIN)VIN – VOUT < 250mV
VIN – VOUT > 750mV
1.00
0.1
V
ISC
Charger Short-Circuit Current Limit
PROG Pin Shorted to GND, FB = 0
2
3
4
A
tSS
Charger Soft Start Time
FB = 0
1.5
ms
TLIM
Junction Temperature in Constant Temperature
Mode (Note 5)
VOUT = 0, FB = 0, RPROG = 0.5k
105
°C
Voltage Clamps
VCLAMP
Maximum Voltage Across the Top Capacitor
VSEL = Lo
VSEL = Hi
l
2.45
2.7
2.5
2.75
V
Maximum Voltage Across the Bottom Capacitor
VSEL = Lo
VSEL = Hi
l
2.45
2.7
2.5
2.75
V
VRIP
VOUT Clamp Hysteresis
If Either Capacitor Reaches Clamp
Voltage i.e. VOUT < VIN
50
mV
ISH(TOP)
Top Shunt Current
RPROG = 1k, (VOUT – VMID) > VCLAMP
160
mA
ISH(BOT)
Bottom Shunt Current
RPROG = 1k, VMID > VCLAMP
140
mA
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