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参数资料
| 型号： | LTC3552EDHC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ION 16-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.25 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 带卷 (TR) |
LTC3552-1
APPLICATIO S I FOR ATIO
The charger constantly monitors the BAT pin voltage in
standby mode. If this voltage drops below the 4.1V re-
charge threshold (V RECHRG ), another charge cycle begins
and charge current is once again supplied to the battery.
To manually restart a charge cycle when in standby mode,
the input voltage must be removed and reapplied, or the
charger must be shut down and restarted using the
EN pin.
with similar electrical characteristics. The choice of which
style inductor to use often depends more on the price vs
size requirements and any radiated ?eld/EMI requirements
than on what the LTC3552-1 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3552-1 applications.
Table 1. Representative Surface Mount Inductors
PART VALUE DCR MAX DC SIZE
NUMBER (μH) ( Ω MAX) CURRENT (A) W × L × H (mm)
? I L = OUT ? 1 ? OUT ?
Switching Regulator Inductor Selection
The inductor value has a direct effect on inductor ripple
current Δ I L , which decreases with higher inductance and
increases with higher V CC or V OUT :
V ? V ?
f O ? L ? V CC ?
Accepting larger values of Δ I L allows the use of low
inductances, but results in higher output ripple voltage,
greater core losses, and lower output current capability.
Sumida
CDRH3D16
Sumida
CDRH2D11
Sumida
CMD4D11
Murata
LQH32CN
Toko
D312F
Murata
ELT5KT
2.2
3.3
4.7
1.5
2.2
2.2
3.3
1.0
2.2
2.2
3.3
3.3
4.7
0.075
0.110
0.162
0.068
0.170
0.116
0.174
0.060
0.097
0.060
0.260
0.17
0.20
1.20
1.10
0.90
0.900
0.780
0.950
0.770
1.00
0.79
1.08
0.92
1.00
0.95
3.8 × 3.8 × 1.8
3.2 × 3.2 × 1.2
4.4 × 5.8 × 1.2
2.5 × 3.2 × 2.0
2.5 × 3.2 × 2.0
4.5 × 5.4 × 1.2
V OUT ? V OUT ?
f O ? ? I L ?
V OUT ( V CC ? V OUT )
A reasonable starting point for setting ripple current is
Δ I L = 0.3 ? I OUT(MAX) ,
where I OUT(MAX) is 800mA for regulator 1 and 400mA for
regulator 2. The largest ripple current Δ I L occurs at the
maximum input voltage. To guarantee that the ripple cur-
rent stays below a speci?ed maximum, the inductor value
should be chosen according to the following equation:
L = ? 1 ? ?
V CC ( MAX ) ?
The inductor value will also have an effect on Burst Mode
operation. The transition from low current operation begins
when the peak inductor current falls below a level set by
the burst clamp. Lower inductor values result in higher
rip-ple current which causes this to occur at lower load
cur-rents. This causes a dip in ef?ciency in the upper range of
low current operation. In Burst Mode operation, lower induc-
tance values will cause the burst frequency to increase.
Inductor Core Selection
Different core materials and shapes will change the
size/current and price/current relationship of an induc-
tor. Toroid or shielded pot cores in ferrite or permalloy
materials are small and do not radiate much energy, but
generally cost more than powdered iron core inductors
Input Capacitor (C IN ) Selection
In continuous mode, the input current of the converter is a
square wave with a duty cycle of approximately V OUT /V CC .
To prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. The maximum RMS capacitor
current is given by:
I RMS ≈ I MAX
V CC
where the maximum average output current I MAX equals
the peak current minus half the peak-to-peak ripple cur-
rent, I MAX = I LIM – Δ I L /2.This formula has a maximum at
V CC = 2V OUT , where I RMS = I OUT /2. This simple worst-case
is commonly used to design because even signi?cant
deviations do not offer much relief. Note that capacitor
manufacturer’s ripple current ratings are often based
on only 2000 hours life-time. This makes it advisable to
further derate the capacitor, or choose a capacitor rated at
a higher temperature than required. Several capacitors may
also be paralleled to meet the size or height requirements
of the design. An additional 0.1μF to 1μF ceramic capacitor
is also recommended on V CC for high frequency decoupling,
when not using an all ceramic capacitor solution.
35521fa
13
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