LTC3441 - 大电流微功率同步降压-升压型 DC-DC 转换器 LTC3441EDE
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
1
LTC3441
2
sn3441 3441fs
V IN , V OUT Voltage........................................ –0.3V to 6V SW1, SW2 Voltage
DC ...........................................................–0.3V to 6V Pulsed < 100ns ...................................... –0.3V to 7V SHDN/SS, MODE/SYNC Voltage................. –0.3V to 6V Operating Temperature Range (Note 2)..–40°C to 85°C Maximum Junction Temperature (Note 4)........... 125°C Storage Temperature Range................ –65°C to 125°C
ORDER PART NUMBER (Note 1)
ABSOLUTE AXI U RATI GS
W W W
U PACKAGE/ORDER I FOR ATIO
U U W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3441EDE
T JMAX = 125°C
θJA = 53°C/W 1-LAYER BOARD θJA = 43°C/W 4-LAYER BOARD
θJC = 4.3°C/W
EXPOSED PAD IS PGND (PIN 13)MUST BE SOLDERED TO PCB
DE PART MARKING
3441
121110987
123456
FB V C V IN PV IN V OUT MODE/SYNC
SHDN/SS
GND PGND SW1SW2PGND
TOP VIEW
13
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = V OUT = 3.6V,unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS
MIN
TYP MAX UNITS
Input Start-Up Voltage ● 2.3
2.4V Output Voltage Adjust Range ● 2.4 5.25V Feedback Voltage ●
1.19
1.22 1.25V Feedback Input Current
V FB = 1.22V 150nA Quiescent Current—Burst Mode Operation V C = 0V, MODE/SYNC = 3V (Note 3)
2540µA Quiescent Current—SHDN V OUT = SHDN = 0V, Not Including Switch Leakage 0.11µA Quiescent Current—Active MODE/SYNC = 0V (Note 3)520900µA NMOS Switch Leakage Switches B and C 0.17µA PMOS Switch Leakage Switches A and D 0.110
µA NMOS Switch On Resistance Switches B and C 0.10ΩPMOS Switch On Resistance Switches A and D
0.11
ΩInput Current Limit ●
2 3.2A Max Duty Cycle Boost (% Switch C On)●7088
%Buck (% Switch A In)
●100%
Min Duty Cycle ●0
%Frequency Accuracy ●0.851
1.15MHz MODE/SYNC Threshold ●
0.4
1.4V MODE/SYNC Input Current V MODE/SYNC = 5.5V
0.011
µA Error Amp AV OL
90dB Error Amp Source Current 14µA Error Amp Sink Current 300µA
SHDN/SS Threshold When IC is Enabled
●0.41 1.4V SHDN/SS Threshold When EA is at Max Boost Duty Cycle 2 2.4V SHDN/SS Input Current
V SHDN = 5.5V
0.01
1
µA
Switch Pins Entering
Buck-Boost Mode
SW1
2V/DIV
SW2
2V/DIV
V IN = 4.2V50ns/DIV3441 G04
V OUT = 3.3V
I OUT = 500mA
sn3441 3441fs
3