LTC4099 Linear Technology Corporation, LTC4099 Datasheet - Page 31

• Manufacturer Part Number: LTC4099
• Description: I2C Controlled USB Power Manager/Charger
• Manufacturer: Linear Technology Corporation

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High value, low ESR multilayer ceramic chip capacitors
reduce the constant-voltage loop phase margin, possibly
resulting in instability. Ceramic capacitors up to 100μF may
be used in parallel with a battery, but larger ceramics should
be decoupled with 0.2 to 1 of series resistance.
Furthermore, a 100μF MLCC in series with a 0.3 resistor
or a 100μF OS-CON capacitor from BAT to GND is required
to prevent oscillation when the battery is disconnected.
In constant-current mode, the PROG pin is in the feed-
back loop rather than the battery voltage. Because of the
additional pole created by any PROG pin capacitance,
APPLICATIONS INFORMATION
TYPICAL APPLICATIONS
FIREWIRE, ETC.
M1, M2, M4: Si2333DS
M3: NTLJS4114N
AUTOMOTIVE,
USB
High Effi ciency USB/Automotive Battery Charger with Overvoltage Protection,
R1
R3
M1
M2
TO μC
TO μC
Reverse-Voltage Protection and Low Battery Start-Up
6.2k
D1
R4
D3
M3
3
T
R5
100k
R6
100k
C1
4.7μF
50V
R2
27.4k
C3
22μF
0805
15-17
13
20
1
4
1
8
3
2
V
I
GND
V
OVGATE
OVSENS
I
IRQ
NTCBIAS
NTC
LIM
2
IN
BUS
C
C4
0.1μF
0603
9
CLPROG
capacitance on this pin must be kept to a minimum. With
no additional capacitance on the PROG pin, the charger is
stable for program resistor values as high as 25k. However,
additional capacitance on this node reduces the maximum
allowed program resistor. The pole frequency at the PROG
pin should be kept above 100kHz. Therefore, if the PROG
pin has a parasitic capacitance, C
tion should be used to calculate the maximum resistance
value for R
V
R7
3.01k
19
V
C
C
3
4
R
LTC4099
LT3653
PROG
PROG
HVOK
WALL
7
R8
1.02k
2
5
GND
PROG
ACPR
9, 21
BOOST
2
BATSENS
18
7
IDGATE
I
•
:
SENSE
SW
V
V
100
BAT
OUT
6
SW
OUT
14
3.3μH
Li-Ion
L2
12
10
11
kHz C
8
6
5
1
+
•
M4
D2
PROG
C2
0.1μF
10V
4099 TA02
PROG
C5
22μF
0805
SYSTEM
LOAD
4.7μH
L1
, the following equa-
LTC4099
31
4099f