LTC3853_15 Datasheet, PDF (36/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller

LTC3853
TYPICAL APPLICATION
Three Phase 2.5V Output High Current Step-Down Converter with R_SENSE
0.78µH
V_OUT1
2.5V
40A
100Ω*
0.002Ω
5% _100Ω*
43.2k
1%
47pF
C_P1
+
660µF
4V
×3
20k
1%
4.7µF
V_IN DRV_CC12 INTV_CC
TG1
TG2
PGOOD12
PGOOD3
BOOST1,2,3
SW1
SW2
BG1 LTC3853 BG2
1000pF*
R_ITH1
C_ITH1
MODE/PLLIN
PGND
ILIM
FREQ/PLLFLTR
SENSE1⁺
SENSE2⁺
EXTV_CC
SENSE1^–
SENSE2^–
V_FB1
V_FB2
V_FB3
I_TH1
I_TH2
I_TH3
SGND
RUN1
RUN2
RUN3
TG3
SW3
BG3
SENSE3⁺
SENSE3^–
TK/SS1
C_SS1
0.33µF
D_B1,2,3
C_B1,2,3 0.1µF
SW1,2,3
0.78µH
10k
INTV_CC
1000pF*
100Ω*
0.002Ω
5%
100Ω*
V_OUT1
2.55k
1000pF
R_ITH1 = 3.9k, C_ITH1 = 10nF, C_P1 = 470pF • 3
SHORT TK/SS1, TK/SS2 AND TK/SS3 TOGETHER
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
3853 TA05
V_IN
180µF ^{6.5V TO 14V}
16V
0.78µH
100Ω*
1000pF*
100Ω*
0.002Ω
5%
V_OUT1
RELATED PARTS
PART NUMBER
LTC3850/LTC3850-1/
LTC3850-2
LTC3861
LTC3855
LTC3829
LTC3856
LTC3851A/
LTC3851A-1
DESCRIPTION
Dual Output Synchronous Step-Down DC/DC Controller
R_SENSE or DCR Current Sensing
Dual Output Synchronous Step-Down DC/DC Controller with
Diff Amp, DCR Current Sense, PolyPhase^® and Three-State
Output Drive
Dual Output Synchronous Step-Down DC/DC Controller with
Diff Amp, PolyPhase and DCR Temperature Compensation
3-Phase, Single Output Synchronous Step-Down DC/DC
Controller with Diff Amp, PolyPhase and DCR Temperature
Compensation
2-Phase, Single Output Synchronous Step-Down DC/DC
Controller with Diff Amp, PolyPhase and DCR Temperature
Compensation
Single Output Synchronous Step-Down DC/DC Controller
R_SENSE or DCR Current Sensing
COMMENTS
Phase-Lockable Fixed 250kHz to 780kHz Frequency,
4V ≤ V_IN ≤ 30V, 0.8V ≤ V_OUT ≤ 5.25V
Operates with Power Blocks, DRMOS Devices or External
MOSFETs 3V ≤ V_IN ≤ 24V
Phase-Lockable Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 12V
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V
Phase-Lockable Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V
Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz,
4V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5.25V, MSOP-16E 3mm × 3mm
QFN-16, SSOP-16
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3853}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3853
3853fc
LT 0315 REV C • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2008