參數(shù)資料
型號(hào)： LTC4110EUHF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38
封裝： 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 17/52頁(yè)
文件大?。?/td> 450K
代理商： LTC4110EUHF
LTC4110
24
4110fb
The micropower shutdown state will be maintained if the
DCIN supply is removed and sufcient battery voltage is
present (VBAT ≥ 2.7V). When DCIN is reapplied as detected
by the UVLO (see VUVI), regardless of the level of the
SHDN pin, the shutdown state is automatically cancelled.
Register reset state is cancelled until DCIN is reapplied as
determined by the DCDIV pin.
The voltage across the external current programming
resistor RSNS(BAT) is averaged by the RC network con-
nected to the CSP and CSN pins and then amplied by a
ratio of RICHG/(RCSP1 + RCSP2). This amplied voltage is
compared with the bandgap reference through the cur-
rent loop error amplier to adjust the ITH pin which sets
the current comparator threshold to maintain a constant
charging current. Once the battery voltage rises to close
to the programmed oat voltage, the voltage loop error
amplier gradually pulls the ITH pin low, reduces the charg-
ing current and maintain a constant voltage charging.
C/x CHARGE TERMINATION
LTC4110 monitors the charging current through the volt-
age on the ICHG pin, once the current drops below 20% of
the bulk charging current, an internal C/x comparator is
tripped, and the LTC4110 will enter top-off charge stage
if standard Li-Ion battery mode is selected or release the
GPI01 pin if no-host SLA battery mode is selected. The
actual x value depends on the programmed charging cur-
rent and the C rate of the battery.
x
C
ICHG
=
5
OPERATION
Figure 9. LTC4110 PWM Engine
In shutdown; charge, calibration and backup modes are
inhibited, all registers are set to their default states (with
exception of the backup fault bit register), the internal
timer is reset and oscillator disabled, the status pins;
ACPb, GPIO1, GPIO2 and GPIO3 are a high impedance
and the LTC4110 is put into a micropower state. While
in shutdown the SMBus is disabled and the SDA and
SCL pins are high impedance. In addition, the shutdown
state will disconnect loads from the battery to prevent its
discharge as follows:
The BATID pin is forced to the battery voltage to turn
off the battery P-MOSFETs for isolation of the load from
the battery
The CHGFET and DCHFET pins are forced to GND to
turn off the yback switcher N-MOSFETs
Current into the BAT pin is minimized. Also the VDD and
VREF pin voltages will fall to zero.
While in shutdown, the LTC4110 will draw a small current
from battery (IBSD)iftheDCINsupplyisabsent.IftheSHDN
pin is open an internal weak pull-up current (IISD) pulls the
pin voltage up thereby entering the shutdown state.
PWM OPERATION
A conceptual diagram of the LTC4110 PWM engine is
shown in Figure 9.
Figure 8. Shutdown Control Input
SHDN
LTC4110
SHUTDOWN
4110 F08
5V
IISD
VFB
4110 F09
BAT
RCSP2
CSP
RCSP1
RSNS(BAT)
VSNS
+
–
+
–
RCSN2 CSN
INPUT
CURRENT
AMPLIFIER
VICHG =
RICHG/(RCSP1 + RCSP2)*VSNS
VOLTAGE
LOOP EA
REFERENCE
VOLTAGE
ADJUSTED BY
VCHG PIN
+
–
CURRENT
LOOP EA
BANDGAP
RCSN1
+
ITH
RICHG
ICHG
+
–
+
–
+
–
相關(guān)PDF資料
PDF描述
LTC4151CS-2#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
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LTC4151HDD#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
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