LTC4006 Linear Technology, LTC4006 Datasheet - Page 4

• Manufacturer Part Number: LTC4006
• Description: Standalone Li-Ion Battery Charger
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
LTC4006
temperature range (Note 4), otherwise specifications are at T
SYMBOL
Oscillator
f
f
DC
Gate Drivers (TGATE, BGATE)
TGTR
TGTF
BGTR
BGTF
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: See Test Circuit
Note 3: Does not include tolerance of current sense resistor.
PI FU CTIO S
DCIN (Pin 1): External DC Power Source Input. Bypass
this pin with at least 0.01 F. 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 25 A 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-
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).
4
OSC
MIN
MAX
U
PARAMETER
Regulator Switching Frequency
Regulator Switching Frequency in Drop Out
Regulator Maximum Duty Cycle
V
V
V
V
TGATE Transition Time
BGATE Transition Time
V
V
U
TGATE
BGATE
TGATE
BGATE
TGATE
BGATE
TGATE Rise Time
TGATE Fall Time
BGATE Rise Time
BGATE Fall Time
High (V
High
Low (V
Low
at Shutdown (V
at Shutdown
U
CLN
CLN
– V
– V
TGATE
TGATE
CLN
– V
)
)
TGATE
)
Duty Cycle 98%
V
I
C
C
I
C
C
C
C
I
I
CONDITIONS
TGATE
BGATE
TGATE
BGATE
CSP
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
The
A
= V
= –1mA
= 3000pF
= 3000pF
= 3000pF, 10% to 90%
= 3000pF, 10% to 90%
= 3000pF, 10% to 90%
= 3000pF, 10% to 90%
= –1 A, DCIN = 0V, CLN = 12V
= 1mA
= 1 A, DCIN = 0V, CLN = 12V
= 25 C. V
BAT
denotes specifications which apply over the full operating
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.
ACP/SHDN (Pin 3): Open-Drain Output Used to Indicate if
the AC Adapter Voltage is Adequate for Charging. Active
high digital output. Internal 10 A 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
0.1 s.
R
placing a resistor, R
If this resistor is not present, the charger will not start.
GND (Pin 5): Ground for Low Power Circuitry.
T
DCIN
The timer period is t
(Pin 4): Timer Resistor. The timer period is set by
= 20V, V
BAT
= 12V unless otherwise noted.
RT
TIMER
, to GND.
MIN
255
4.5
4.5
20
98
= (1hour • R
TYP
300
5.6
5.6
40
40
25
99
50
50
RT
MAX
345
110
100
100
100
/154k)
50
10
10
50
90
80
sn4006 4006is
UNITS
kHz
kHz
mV
mV
mV
mV
ns
ns
ns
ns
%
V
V