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LTC4100EGTRPBF Datasheet(PDF) 11 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) 11 Page - Linear Technology

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LTC4100
11
4100fb
OPERATION
While the top MOSFET is off, the bottom MOSFET is
turned on until either the inductor current trips the current
comparator IREV, or the beginning of the next cycle. The
oscillator uses the equation,
t
VV
Vf
OFF
DCIN
BAT
DCIN
OSC
=
(–
)
(•
)
to set the bottom MOSFET on-time. The result is quasi-
constant frequency operation: the converter frequency
remains nearly constant over a wide range of output
voltages. This activity is diagrammed in Figure 3.
The peak inductor current, at which ICMP resets the SR
latch, is controlled by the voltage on ITH. ITH is in turn
controlled by several loops, depending upon the situation
at hand. The average current control loop converts the
voltage between CSP and BAT to a representative current.
Error amp CA2 compares this current against the desired
current programmed by the IDAC at the IDC pin and adjusts
ITH for the desired voltage across RSENSE.
The voltage at BAT is divided down by an internal resis-
tor divider set by the VDAC and is used by error amp EA
to decrease ITH if the divider voltage is above the 1.19V
reference.
The amplifier CL1 monitors and limits the input current,
normally from the AC adapter, to a preset level (100mV/RCL).
At input current limit, CL1 will decrease the ITH voltage to
reduce charging current.
An overvoltage comparator, OV, guards against transient
overshoots (>7%). In this case, the top MOSFET is turned
off until the overvoltage condition is cleared. This feature
is useful for batteries that “load dump” themselves by
opening their protection switch to perform functions such
as calibration or pulse mode charging.
PWM Watchdog Timer
There is a watchdog timer that observes the activity on
the TGATE pin. If TGATE stops switching for more than
40μs, the watchdog activates and turns off the top MOSFET
for about 400ns. The watchdog engages to prevent very
low frequency operation in dropout—a potential source
of audible noise when using ceramic input and output
capacitors.
Charger Start-Up
When the charger is enabled, it will not begin switching
until the ITH voltage exceeds a threshold that assures initial
current will be positive. This threshold is 5% to 15% of the
maximum programmed current. After the charger begins
switching, the various loops will control the current at a
level that is higher or lower than the initial current. The
duration of this transient condition depends upon the loop
compensation, but is typically less than 1ms.
SMBus Interface
All communications over the SMBus are interpreted by the
SMBus interface block. The SMBus interface is a SMBus
slave device at address 0x12. All internal LTC4100 registers
may be updated and accessed through the SMBus interface,
and charger controller as required. The SMBus protocol
is a derivative of the I2C bus (Reference
I2C-Bus and How
to Use It, V1.0 by Philips, and System Management Bus
Specification, Version 1.1, from the SBS Implementers
Forum, for a complete description of the bus protocol
requirements.)
All data is clocked into the shift register on the rising edge
of SCL. All data is clocked out of the shift register on the
falling edge of SCL. Detection of an SMBus Stop condi-
tion, or power-on reset via the VDD power-fail, will reset
the SMBus interface to an initial state at any time.
The LTC4100 command set is interpreted by the SMBus
interface and passed onto the charger controller block as
control signals or updates to internal registers.
Figure 3
tOFF
OFF
OFF
ON
ON
TGATE
BGATE
INDUCTOR
CURRENT
TRIP POINT SET
BY ITH VOLTAGE
4100 F03
*http://www. SBS-FORUM.org


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