LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 54

• Manufacturer Part Number: LTC3855
• Description: Dual, Fast, Accurate Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

LTC3838
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LTC3833
LTC3880/LTC3880-1 Dual Output PolyPhase Step-Down DC/DC Controller with
LTC3869/LTC3869-2 Dual Output, 2-Phase Synchronous Step-Down DC/DC
LTC3855
LTC3856
LTC3860
LTC3850/LTC3850-1
LTC3850-2
LTC3829
LTC3853
54
4.5V TO 26V
V
OUT1
4.5V to 26V Input, 2.5V/4A and 1.8V/4A Dual Output, 1MHz, R
2.5V
V
IN
4A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
+
C
47μF
C
100μF
IN1
0.006Ω
OUT1
2
DESCRIPTION
Fast Controlled On-Time, High Frequency Synchronous
Step-Down Controller with Diff Amp
Digital Power System Management
Controller, with Accurate Current Sharing
Dual Output, 2-phase, Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temperature Compensation
Single Output 2-Channel Synchronous Step-Down DC/DC
Controller with Diff Amp and Up to 12-Phase Operation
Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Diff Amp and Three-State Output Drive
Dual Output, 2-Phase Synchronous Step-Down DC/DC
Controller, R
Single Output 3-Channel Synchronous Step-Down DC/DC with
Diff Amp and Up to 6-phase Operation
Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
R
S1
●
FAX: [phone]
C
10μF
1.2μH
IN2
3
L1
SENSE
SENSE
M1
or DCR Current Sensing
or DCR Current Sensing and Tracking
100k
20Ω
20Ω
●
2.2Ω
2.2Ω
0.1μF
www.linear.com
75k
31.6k
1μF
0.01μF
DB1
1μF
1nF
PGOOD1
10k
100pF
39.2k
4.7μF
V
SENSE1
SENSE1
BOOST1
TG1
SW1
DRV
INTV
BG1
PGND
V
V
PGOOD1
TRACK/SS1
ITH1
DTR1
V
RT
SGND
RUN1
IN
OUTSENSE1
OUTSENSE1
RNG1
CC1
CC
–
+
LTC3838
MODE/PLLIN
+
–
TRACK/SS2
SENSE2
SENSE2
PHASMD
PGOOD2
BOOST2
CLKOUT
DRV
SENSE
EXTV
V
RUN2
DTR2
RNG2
SW2
ITH2
V
TG2
BG2
CC2
FB2
CC
–
+
COMMENTS
200kHz to 2MHz Operating Frequency, 4.5V ≤ V
0.6V ≤ V
I
0.5V ≤ V
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V
V
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V
0.8V ≤ V
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V
0.8V ≤ V
Operates with Power Blocks, DRMOS Devices or External Drivers/
MOSFETs, 3V ≤ V
PLL Fixed 250kHz to 780kHz Frequency, 4V ≤ V
0.8V ≤ V
Controller Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V
V
, Dual Channel Power FETs, Step-Down Converter
2
PGOOD2
OUT3
OUT3
C/PMBus Interface with EEPROM and 16-Bit ADC, V
100pF
0.01μF
Up to 12.5V
Up to 13.5V
OUT
OUT
OUT
OUT
OUT
IN
0.1μF
1nF
DB2
10k
61.9k
≤ 38V, 0.8V ≤ V
100k
20k
20Ω
20Ω
≤ 5.5V, , 3mm × 4mm QFN-20, TSSOP-20
≤ 5.5V, Analog Control Loop
≤ 12V
≤ 5V
≤ 5.25V
IN
≤ 24V, t
M2
3838 TA02
OUT
ON(MIN)
C
C
C
C
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: COILCRAFT XAL5030-122MEB
M1, M2: SILICONIX SI4816DY
1.2μH
IN1
IN2
OUT1
OUT2
© LINEAR TECHNOLOGY CORPORA TION 2011
≤ 5V
L2
: SUN CON 35HVP47M
: TAIYO YUDEN GMK325BJ106MN-T
,C
, C
OUT2
= 20ns
OUT4
0.006Ω
R
: MURATA GRM31CR60J107ME39L
S2
: SANYO 4TPC150M
LT 0612 REV A • PRINTED IN USA
C
100μF
IN
IN
IN
IN
V
1.8V
4A
OUT2
2
IN
IN
OUT2
≤ 38V,
≤ 30V,
≤ 24V,
≤ 38V,
≤ 38V,
≤ 38V,
IN
Up to 24V,
3838fa