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LTC4006EGN-2#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
4
LTC4006
4006fa
The ● denotes specifications which apply over the full operating
temperature range (Note 4), otherwise specifications are at T
A
= 25°C. V
DCIN
= 20V, V
BAT
= 12V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Oscillator
f
OSC
Regulator Switching Frequency 255 300 345 kHz
f
MIN
Regulator Switching Frequency in Drop Out Duty Cycle ≥ 98% 20 25 kHz
DC
MAX
Regulator Maximum Duty Cycle V
CSP
= V
BAT
98 99 %
Gate Drivers (TGATE, BGATE)
V
TGATE
High (V
CLN
– V
TGATE
)I
TGATE
= –1mA 50 mV
V
BGATE
High C
LOAD
= 3000pF 4.5 5.6 10 V
V
TGATE
Low (V
CLN
– V
TGATE
)C
LOAD
= 3000pF 4.5 5.6 10 V
V
BGATE
Low I
BGATE
= 1mA 50 mV
TGATE Transition Time
TGTR TGATE Rise Time C
LOAD
= 3000pF, 10% to 90% 50 110 ns
TGTF TGATE Fall Time C
LOAD
= 3000pF, 10% to 90% 50 100 ns
BGATE Transition Time
BGTR BGATE Rise Time C
LOAD
= 3000pF, 10% to 90% 40 90 ns
BGTF BGATE Fall Time C
LOAD
= 3000pF, 10% to 90% 40 80 ns
V
TGATE
at Shutdown (V
CLN
– V
TGATE
)I
TGATE
= –1µA, DCIN = 0V, CLN = 12V 100 mV
V
BGATE
at Shutdown I
BGATE
= 1µA, DCIN = 0V, CLN = 12V 100 mV
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: See Test Circuit
Note 3: Does not include tolerance of current sense resistor.
Note 4: The LTC4006E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
INFET Response Time to
Reverse Current
TEST PERFORMED ON DEMOBOARD
V
IN
= 15VDC
CHARGER = ON
I
CHARGE
= <10mA
V
s
OF PFET (5V/DIV)
I
d
(REVERSE) OF
PFET (5A/DIV)
V
gs
OF PFET (2V/DIV)
4006 G01
LTC4006-2
INFET = 1/2 Si4925DY
V
gs
= 0
V
s
= 0V
I
d
= 0A
1.25µs/DIV
V
OUT
vs I
OUT
PWM Frequency vs Duty Cycle
DUTY CYCLE (V
OUT
/V
IN
)
0 0.1 0.2 0.4 0.6 0.90.80.3 0.5 0.7 1.0
PWM FREQUENCY (kHz)
4006 G03
PROGRAMMED CURRENT = 10%
DCIN = 15V
DCIN = 20V
DCIN = 24V
350
300
250
200
150
100
50
0
OUTPUT CURRENT (A)
0 0.5 1.0 2.0 3.0 4.01.5 2.5 3.5 4.5
OUTPUT VOLTAGE ERROR (%)
4006 G02
DCIN = 20V
V
BAT
= 12.6V
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
5
LTC4006
4006fa
nected and the CHG pin is forced into a high impedance
state. A pull-up resistor is required. The timer function is
defeated by forcing this pin below 1V (or connecting it to
GND).
ACP/SHDN (Pin 3): Open-Drain Output used to indicate if
the AC adapter voltage is adequate for charging. Active
high digital output. Internal 10µA pull-up to 3.5V. The
charger can also be inhibited by pulling this pin below 1V.
Reset the charger by pulsing the pin low for a minimum of
0.1µs.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Disconnect/Reconnect Battery
(Load Dump)
Battery Leakage Current vs
Battery Voltage
4006 G04
LOAD CURRENT = 1A, 2A, 3A
DCIN = 20V
LTC4006-2
V
FLOAT
1V/(DIV)
LOAD
STATE
DISCONNECT
RECONNECT
1A STEP
3A STEP
3A STEP
1A STEP
BATTERY VOLTAGE (V)
0 5 10 15 20 25 30
BATTERY LEAKAGE CURRENT (µA)
4006 G05
40
35
30
25
20
15
10
5
0
VDCIN = 0V
Efficiency at 19VDC V
IN
LTC4006-2 Efficiency with
15VDC V
IN
CHARGING CURRENT (A)
1.000.50 1.50 2.00 2.50 3.00
EFFICIENCY (%)
4006 G07
LTC4006-4
LTC4006-2
100
95
90
85
80
75
CHARGING CURRENT (A)
1.000.50 1.50 2.00 2.50 3.00
EFFICIENCY (%)
4006 G08
100
95
90
85
80
75
UU
U
PI FU CTIO S
DCIN (Pin 1): External DC Power Source Input. Bypass
this pin with at least 0.01µF. See Applications Information
section.
CHG (Pin 2): Open-Drain Charge Status Output. When the
battery is being charged, the CHG pin is pulled low by an
internal N-channel MOSFET. When the charge current
drops below 10% of programmed current, the N-channel
MOSFET turns off and a 25µA current source is connected
from the CHG pin to GND. When the timer runs out or the
input supply is removed, the current source will be discon-
6
LTC4006
4006fa
UU
U
PI FU CTIO S
CSP (Pin 9): Current Amplifier CA1 Input. This pin and the
BAT pin measure the voltage across the sense resistor,
R
SENSE
, 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 10µF 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.
R
T
(Pin 4): Timer Resistor. The timer period is set by
placing a resistor, R
RT
, to GND.
The timer period is t
TIMER
= (1hour • R
RT
/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.
I
TH
(Pin 7): Control Signal of the Inner Loop of the Current
Mode PWM. Higher I
TH
voltage corresponds to higher
charging currrent in normal operation. A 6.04k resistor, in
series with a capacitor of at least 0.1µF to GND, provides
loop compensation. Typical full-scale output current is
40µA. Nominal voltage range for this pin is 0V to 3V.
I
MON
(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 I
MON
to ground is
required to filter higher frequency components. If V
BAT
<
2.5V/cell, then V(I
MON
) = 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
V
REF
11.67µA
BAT
10
CSP
9
I
TH
0.6V
4006 TC
7
35mV
3k
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC4006EGN-2#PBF

Mfr. #:
Buy LTC4006EGN-2#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 4A, Simplified Li-Ion Charger for 3-Cell
Lifecycle:
New from this manufacturer.
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