LTC4090EDJC(RevA) View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC4090EDJC
(Rev.:RevA)
(Rev.:RevA)
Linear Technology
LTC4090EDJC Datasheet PDF : 28 Pages
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LTC4090/LTC4090-5
APPLICATIONS INFORMATION
IN and HVIN Bypass Capacitor
Many types of capacitors can be used for input bypassing;
however, caution must be exercised when using multilayer
ceramic capacitors. Because of the self-resonant and high
Q characteristics of some types of ceramic capacitors,
high voltage transients can be generated under some
start-up conditions, such as from connecting the charger
input to a hot power source. For more information, refer
to Application Note 88.
Battery Charger Stability Considerations
The constant-voltage mode feedback loop is stable without
any compensation when a battery is connected with low
impedance leads. Excessive lead length, however, may add
enough series inductance to require a bypass capacitor
of at least 1μF from BAT to GND. Furthermore, a 4.7μF
capacitor with a 0.2Ω to 1Ω series resistor to GND is
recommended at the BAT pin to keep ripple voltage low
when the battery is disconnected.
TYPICAL APPLICATIONS
HIGH
(6V TO 36V)
VOLTAGE
INPUT
USB
C1
1μF
50V
1206
4.7μF
6.3V
59k
1%
270pF
0.1μF
2.1k
1%
71.5k
1%
40.2k
1%
HVIN
HVEN
IN
HPWR
VC
SUSP
TIMER
CLPROG
PROG
RT
PG
BOOST SW
LTC4090
HVOUT
HVPR
OUT
GATE
BAT
VNTC
SYNC
NTC
D: DIODES INC. B360A
L: SUMIDA CDR6D28MN-GR5
Q1, Q2: SILICONIX Si2333DS
CHRG
0.47μF
16V
D1
L1
6.8μH
C3
22μF
6.3V
1206
680Ω
Q1
1k
LOAD
4.7μF
Q2
6.3V
10k
1%
680Ω
+ Li-Ion
BATTERY
T 10k
4090 F12
Figure 12. 800kHz Switching Frequency
HIGH (6V TO 36V)
TRANSIENT TO 60V*
HVIN
1μF
BOOST
0.47μF
SW
HVOUT
L
10μH
4.7μF
USB
IN
LTC4090
HVPR
4.7μF
Q1
1k
35k
88.7k
330pF
VC
RT
TIMER CLPROG GND
0.1μF
2.1k
OUT
BAT
PROG
71.5k +
4.7μF
LOAD
Li-Ion BATTERY
L: SUMIDA CDRH8D28/HP-100
* USE SCHOTTKY DIODE RATED AT VR > 45V
Figure 13. 400kHz Switching Frequency
4090 TAO3
HIGH (6V TO 16V)
VOLTAGE INPUT
USB
30k
330pF
HVIN
1μF
BOOST
0.47μF
SW
HVOUT
L
2.2μH
22μF
IN
4.7μF
LTC4090
HVPR
Q1
1k
11.5k
VC
RT
TIMER CLPROG GND
0.1μF
2.1k
OUT
BAT
PROG
71.5k +
4.7μF
LOAD
Li-Ion BATTERY
L: SUMIDA CDRH4D22/HP-2R2
Figure 14. 2MHz Switching Frequency
4090 TAO4
4090fa
26
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