LTC3566EUF#TRPBF Linear Technology, LTC3566EUF#TRPBF Datasheet - Page 19

• Manufacturer Part Number: LTC3566EUF#TRPBF
• Description: IC USB POWER MANAGER 24-QFN
• Manufacturer: Linear Technology

Specifications of LTC3566EUF#TRPBF

• Applications: Handheld/Mobile Devices
• Voltage - Supply: 4.35 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

APPLICATIONS INFORMATION
CLPROG Resistor and Capacitor
As described in the High Effi ciency Switching PowerPath
Controller section, the resistor on the CLPROG pin deter-
mines the average input current limit when the switching
regulator is set to either the 1x mode (USB 100mA), the 5x
mode (USB 500mA) or the 10x mode. The input current will
be comprised of two components, the current that is used to
drive V
lator. To ensure that the total average input current remains
below the USB specifi cation, both components of input
current should be considered. The Electrical Characteristics
table gives values for quiescent currents in either setting
as well as current limit programming accuracy. To get as
close to the 500mA or 100mA specifi cations as possible,
a 1% resistor should be used. Recall that I
V
An averaging capacitor or an R-C combination is required
in parallel with the CLPROG resistor so that the switching
regulator can determine the average input current. This
network also provides the dominant pole for the feedback
loop when current limit is reached. To ensure stability, the
capacitor on CLPROG should be 0.1μF or larger.
CLPROG
OUT
/R
and the quiescent current of the switching regu-
CLPROG
• (h
CLPROG
+ 1).
VBUS
= I
VBUSQ
+
Choosing the PowerPath Inductor
Because the input voltage range and output voltage range
of the PowerPath switching regulator are both fairly narrow,
the LTC3566 family was designed for a specifi c inductance
value of 3.3μH. Some inductors which may be suitable for
this application are listed in Table 4.
Table 4. Recommended Inductors for PowerPath Controller
INDUCTOR
TYPE
LPS4018
D53LC
DB318C
WE-TPC
Type M1
CDRH6D12
CDRH6D38
(μH)
3.3
3.3
3.3
3.3
3.3
3.3
L
LTC3566/LTC3566-2
MAX
2.26
1.55
1.95
IDC
(A)
2.2
2.2
3.5
0.0625
0.034
0.070
0.065
0.020
MAX
DCR
0.08
(Ω)
3.9 × 3.9 × 1.7 CoilCraft
5.0 × 5.0 × 3.0
3.8 × 3.8 × 1.8
4.8 × 4.8 × 1.8 Würth Elektronik
6.7 × 6.7 × 1.5
7.0 × 7.0 × 4.0
SIZE IN mm
(L × W × H)
MANUFACTURER
www.coilcraft.
com
Toko
www.toko.com
www.we-online.
com
Sumida
www.sumida.com
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