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LTC4006EGN-4 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC4006EGN-4
Description  4A, High Efficiency, Standalone Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4006EGN-4 Datasheet(HTML) 6 Page - Linear Technology

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6
LTC4006
4006fa
PI FU CTIO S
CSP (Pin 9): Current Amplifier CA1 Input. This pin and the
BAT pin measure the voltage across the sense resistor,
RSENSE, to provide the instantaneous current signals re-
quired for both peak and average current mode operation.
BAT (Pin 10): Battery Sense Input and the Negative
Reference for the Current Sense Resistor. A precision
internal resistor divider sets the final float potential on this
pin. The resistor divider is disconnected during shutdown.
CLP (Pin 11): Positive Input to the Supply Current Limiting
Amplifier, CL1. The threshold is set at 100mV above the
voltage at the CLN pin. When used to limit supply current,
a filter is needed to filter out the switching noise. If no
current limit function is desired, connect this pin to CLN.
CLN (Pin 12): Negative Reference for the Input Current
Limit Amplifier, CL1. This pin also serves as the power
supply for the IC. A 10
µF to 22µF bypass capacitor should
be connected as close as possible to this pin.
TGATE (Pin 13): Drives the top external P-channel MOSFET
of the battery charger buck converter.
PGND (Pin 14): High Current Ground Return for the BGATE
Driver.
BGATE (Pin 15): Drives the bottom external N-channel
MOSFET of the battery charger buck converter.
INFET (Pin 16): Drives the Gate of the External Input PFET.
RT (Pin 4): Timer Resistor. The timer period is set by
placing a resistor, RRT, to GND.
The timer period is tTIMER = (1hour • RRT/154k)
If this resistor is not present, the charger will not start.
GND (Pin 5): Ground for low power circuitry.
NTC (Pin 6): A thermistor network is connected from NTC
to GND. This pin determines if the battery temperature is
safe for charging. The charger and timer are suspended if
the thermistor indicates a temperature that is unsafe for
charging. The thermistor function may be disabled with a
300k to 500k resistor from DCIN to NTC.
ITH (Pin 7): Control Signal of the Inner Loop of the Current
Mode PWM. Higher ITH voltage corresponds to higher
charging currrent in normal operation. A 6.04k resistor, in
series with a capacitor of at least 0.1
µF to GND, provides
loop compensation. Typical full-scale output current is
40
µA. Nominal voltage range for this pin is 0V to 3V.
IMON (Pin 8): Current Monitoring Output. The voltage at
this pin provides a linear indication of charging current.
Peak current is equivalent to 1.19V. Zero current is ap-
proximately 0.309V. A capacitor from IMON to ground is
required to filter higher frequency components. If VBAT <
2.5V/cell, then V(IMON) = 1.19V when conditioning a
depleted battery. Any current sourced or sinked from this
pin directly affects the charging current accuracy. If this
pin is to be monitored, a high impedance input buffer
should be used.
TEST CIRCUIT
+
+
+
EA
LT1055
LTC4006
VREF
11.67
µA
BAT
10
CSP
9
ITH
0.6V
4006 TC
7
35mV
3k


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