參數(shù)資料
型號(hào)： LTC3569IUDC#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 3 X 4 MM, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 10/26頁(yè)
文件大?。?/td> 468K
代理商： LTC3569IUDC#PBF
LTC3569
18
3569fd
Selecting The Inductors
Calculating the inductor values for 30% ripple current at
maximum SVIN:
L1 = 2.5V/(2.25MHz240mA)(1–2.5V/4.2V)= 1.9H
L2 = 1.8V/(2.25MHz120mA)(1–1.8V/4.2V)= 3.8H
L3 = 1.2V/(2.25MHz120mA)(1–1.2V/4.2V)= 3.1H
Choosing a vendor’s closest values gives L1 = 2.2H, L2
= L3 = 3.3H. These values result in the maximum ripple
currents of:
IL1 = 2.5V/(2.25MHz2.2H)(1–2.5V/4.2V) = 204mA
IL2 = 1.8V/(2.25MHz3.3H)(1–1.8V/4.2V) = 139mA
IL3 = 1.2V/(2.25MHz3.3H)(1–1.2V/4.2V) = 115mA
Selecting The Output Capacitors
The value of the output capacitors are calculated based
on a 5% load droop for maximum load current step. The
output droop is usually about 2.5 times the linear drop
of the first cycle and is estimated based on the following
formula:
COUT = 2.5IOUT(MAX)/(fCLKVDROOP)
The output capacitor values are calculated as:
COUT1 = 2.5800mA/(2.25MHz125mV) = 7.1F
COUT2 = 2.5400mA/(2.25MHz90mV) = 4.9F
COUT3 = 2.5400mA/(2.25MHz60mV) = 7.4F
Choosing the closest standard values gives, COUT1 = 10F,
COUT2 = 4.7F and COUT3 = 10F.
A 22F input capacitor is selected since the Li-Ion battery
has sufficiently low output impedance.
Setting The Output Voltages
Without toggling the EN pins the LTC3569 develops a 0.8V
reference voltage for each of the feedback pins. The output
voltages are set by a resistive divider as follows:
VOUT = 0.8(1 + R1/R2)
The resistors in Figure 5 are selected as the nearest 1%
standard resistor values. To improve frequency response
feedforward capacitors of 10pF and 20pF are used.
APPLICATIONS INFORMATION
Figure 5. Triple Buck DC/DC Regulators: 800mA, 400mA, 400mA
Design Example 1: Burst Mode Operation
3569 F05a
SVIN PVIN SW1
PGND
SGND
SW2
SW3
PGOOD
FB1
EN1
EN2
EN3
RT
MODE
FB2
FB3
22F
VIN 2.9V TO 4.2V
L1
2.2H*
COUT1
10F
10pF
20pF
COUT2
4.7F
L2
3.3H**
243k
115k
187k
150k
OUT1
2.5V AT 800mA
OUT2
1.8V AT 400mA
20pF
COUT3
10F
L3
3.3H**
187k
374k
OUT3
1.2V AT 400mA
LTC3569
470k
* WURTH 7447745022
** WURTH 7447745033
ILOAD (mA)
EFFICIENCY
(%)
3569 F05b
100
90
80
70
60
50
0.1
1
1000
10000
100
10
BUCK1 = 2.5V
BUCK2 = 1.8V
BUCK3 = 1.2V
VIN = 2.9V TO 4.2V
相關(guān)PDF資料
PDF描述
LTC3569EFE#TRPBF 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO16
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LTC3588EDD-2#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3569IUD-TRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References
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