MAX8900BEWV+T Maxim Integrated Products, MAX8900BEWV+T Datasheet - Page 28

• Manufacturer Part Number: MAX8900BEWV+T
• Description: IC LI-ION/POLY BATT CHRGR 30WLP
• Manufacturer: Maxim Integrated Products

Specifications of MAX8900BEWV+T

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 3.4 V ~ 8.7 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 30-WLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Consider inductance, current rating, series resistance,
physical size, and cost when selecting an inductor.
These factors affect the converter’s efficiency, maximum
output current, transient response time, and output volt-
age ripple. Tables 5 and 6 show suggested inductor
values based upon input voltage and laboratory tests.
When using the MAX8900_ with IN voltages below 8.5V,
select the inductor to be 1.0FH. This keeps the inductor
peak-to-peak ripple current to the average DC inductor
current at the full load (LIR) between 40% to 50%. If a
lower ripple is desired, select an inductance from 2.2FH
Table 6. Recommended Inductor
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
Table 5. Recommended Inductor Selection
28
DC INPUT VOLTAGE
MANUFACTURER
15.8 to 27.4
RANGE (V)
8.7 to 15.8
3.4 to 8.7
Coilcraft
Murata
TOKO
TDK
1FH inductor, LQM2HPN1R0G0, Murata,
2.5mm x 2.0mm x 0.9mm, 55mI, 1.6A.
1.5FH inductor, LQM2HPN1R5G0, Murata,
2.5mm x 2.0mm x 0.9mm, 70mI, 1.5A
2.2FH inductor, LQM2HPN2R2G0, Murata,
2.5mm x 2.0mm x 0.9mm, 80mI, 1.3A.
LQM2MPN_G0
LQM2HPN_G0
MDT2520-CH
MDT2520-CN
MLP2520S
CPL2512
EPL2014
SERIES
RECOMMENDED INDUCTOR
FOR 40% LIR
Inductor Selection
INDUCTANCE (μH)
1.0
1.5
2.2
1.0
1.5
2.2
3.3
1.0
1.5
2.2
3.3
1.0
1.5
1.0
2.2
1.0
1.5
2.2
1.0
1.5
2.2
3.3
ESR (I)
0.059
0.075
0.120
0.085
0.110
0.110
0.120
0.055
0.070
0.080
0.100
0.060
0.070
0.090
0.135
0.110
0.140
0.085
0.095
0.105
0.115
0.16
to 10FH. Higher input voltages require higher inductors
to maintain the same inductor current ripple.
The trade-off between inductor size and converter effi-
ciency for step-down regulators varies as the LIR varies.
LIR is the ratio of the inductor peak-to-peak ripple current
to the average DC inductor current at the full-load cur-
rent. A higher LIR value allows for smaller inductance, but
result in higher losses and higher output voltage ripple.
To reduce the power dissipation and improve transient
response, choose an inductor that has a low DC series
resistance as well as a low AC resistance at 3.25MHz.
Note that it is typical for low inductance inductors such
as 1FH to have a Q30% initial variation in inductance.
Furthermore, some physically smaller inductors show a
substantial degradation in inductance with increased DC
current. It is typical for inductor manufacturers to specify
their saturation current at the level when the initial induc-
tance decreases by 30% or at the level where the inter-
nal inductor temperature rises +40NC above the ambient
temperature. Because of differences in the way inductor
manufacturers specify saturation current (I
cal that you study and understand your manufacturer’s
specification criteria.
CURRENT RATINGS (A)
1.68
1.60
1.30
1.40
1.20
1.20
1.20
1.60
1.50
1.30
1.20
1.50
1.50
1.20
0.90
1.20
1.10
1.05
1.35
1.25
1.20
1.15
2.0 x 1.6 x 0.9 = 2.88mm
2.0 x 2.0 x 1.4 = 5.6mm
2.5 x 1.5 x 1.2 = 3.6mm
2.5 x 2.0 x 0.9 =4.5mm
2.0 x 2.5 x 1.0 = 5mm
2.5 x 2.0 x 1.0 = 5mm
2.5 x 2.0 x 1.2 = 6mm
DIMENSIONS
SAT
), it is criti-
3
3
3
3
3
3
3