參數(shù)資料
型號: LTC4099EPDC#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20
封裝: 3 X 4 MM, 0.55 MM HEIGHT, LEAD FREE, PLASTIC, UTQFN-20
文件頁數(shù): 7/36頁
文件大?。?/td> 536K
代理商: LTC4099EPDC#TRPBF
LTC4099
4099fd
operaTion
+
+
0.3V
1.18V
3.6V
CLPROG
ISWITCH/N
+ –
+–
15mV
OmV
IDEAL
DIODE
PWM AND
GATE DRIVE
AVERAGE INPUT
CURRENT LIMIT
CONTROLLER
AVERAGE OUTPUT
VOLTAGE LIMIT
CONTROLLER
CONSTANT-CURRENT
CONSTANT-VOLTAGE
BATTERY CHARGER
+
19
IDGATE
10
VOUT
12
SW
3.5V TO
(BAT + 0.3V)
TO SYSTEM
LOAD
OPTIONAL
EXTERNAL
IDEAL DIODE
PMOS
SINGLE-CELL
Li-Ion
4099 F01
14
BAT
11
BATSENS
FROM USB
OR WALL
ADAPTER
13
+
1
OVGATE
VBUS
OVSENS
TO AUTOMOTIVE,
FIREWIRE, ETC.
ACPR
BAT + 0.3V
3.6V
VOUT
4.3V
+
+
18
WALL
Bat-Track HV CONTROL
5
VC
4
SW
FB
HVIN
VC
HIGH VOLTAGE
STEP-DOWN
SWITCHING
REGULATOR
6
2
6V
OVERVOLTAGE PROTECTION
+
+–
20
Whentheswitchingregulatorisactivated,theaverage
inputcurrentwillbelimitedbytheCLPROGprogramming
resistoraccordingtothefollowingexpression:
IVBUS =IVBUSQ +
VCLPROG
RCLPROG
hCLPROG +1
(
)
whereIVBUSQisthequiescentcurrentoftheLTC4099,
VCLPROGistheCLPROGservovoltageincurrentlimit,
RCLPROGisthevalueoftheprogrammingresistorand
hCLPROGistheratioofthemeasuredcurrentatVBUStothe
samplecurrentdeliveredtoCLPROG.RefertotheElectri-
calCharacteristicstableforvaluesofhCLPROG,VCLPROG
andIVBUSQ.Givenworst-casecircuittolerances,theUSB
specificationfortheaverageinputcurrentin100mAor
500mAmodewillnotbeviolated,providedthatRCLPROG
is3.01korgreater.SeeTable2forotheravailablesettings
ofinputcurrentlimit.
While not in current limit, the switching regulator’s
Bat-TrackfeaturewillsetVOUTtoapproximately300mV
abovethevoltageatBAT.However,ifthevoltageatBATis
below 3.3V, and the load requirement does not cause
theswitchingregulatortoexceeditscurrentlimit,VOUT
willregulateatafixed3.6V,asshowninFigure2.This
instant-on feature will allow a portable product to run
immediatelywhenpowerisappliedwithoutwaitingfor
Figure 1. PowerPath Block Diagram
BAT (V)
2.4
4.5
4.2
3.9
3.6
3.3
3.0
2.7
2.4
3.3
3.9
4099 F02
2.7
3.0
3.6
4.2
V OUT
(V)
NO LOAD
300mV
Figure 2. VOUT vs BAT
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