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LTC4100EGTRPBF Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4100EGTRPBF
Description  Smart Battery Charger Controller
Download  30 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4100EGTRPBF Datasheet(HTML) 10 Page - Linear Technology

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LTC4100
10
4100fb
Overview (Refer to Block Diagram)
The LTC4100 is composed of a battery charger section, a
charger controller, a 10-bit DAC to control charger current,
an 11-bit DAC to control charger voltage, a SafetySignal
decoder, limit decoder and an SMBus controller block. If
no battery is present, the SafetySignal decoder indicates
a RES_OR condition and charging is disabled by the
charger controller (CHGEN = Low). Charging will also be
disabled if DCDIV is low, or the SafetySignal is decoded
as RES_HOT. If a battery is inserted and AC power is
connected, the battery will be charged with an 80mA
“wake-up” current. The wake-up current is discontinued
after tTIMEOUT if the SafetySignal is decoded as RES_UR
or RES_C0LD, and the battery or host doesn’t transmit
charging commands.
The SMBus interface and control block receives Charg-
ingCurrent() and ChargingVoltage() commands via the
SMBus. If ChargingCurrent() and ChargingVoltage()
command pairs are received within a tTIMEOUT interval, the
values are stored in the current and voltage DACs and the
TEST CIRCUIT
V
VV
V
FOR V
V x
A
DCIN
V
CLN CLP
V
TOL
BAT
VDAC
VDAC
VDAC
=
=
=
==
.(
)
100
17 57 0 44 0
21
20
+
+
EA
VDAC
0.6V
LT1055
CSP
BAT VSET
ITH
LTC4100
1.19V
4100 TC01
21
22
18
19
OPERATION
charger controller asserts the CHGEN line if the decoded
SafetySignal value will allow charging to commence. Charg-
ingCurrent() and ChargingVoltage() values are compared
against limits programmed by the limit decoder block; if
the commands exceed the programmed limits these limits
are substituted and overrange flags are set.
The charger controller will assert SMBALERT when-
ever a status change is detected, namely: AC_PRESENT,
BATTERY_PRESENT, ALARM_INHIBITED, or VDD power-
fail. The host may query the charger, via the SMBus, to
obtain ChargerStatus() information. SMBALERT will be
deasserted upon a successful read of ChargerStatus() or
a successful Alert Response Address (ARA) request.
Battery Charger Controller
The LTC4100 charger controller uses a constant off-time,
current mode step-down architecture. During normal
operation, the top MOSFET is turned on each cycle when
the oscillator sets the SR latch and turned off when
the main current comparator ICMP resets the SR latch.


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