LTC3856 Datasheet, PDF (40/40 Pages) Linear Technology – 2-Phase Synchronous Step-Down DC/DC Controller with Diffamp

LTC3856
Typical Application
100Ω
330pF
47pF
2.68k
100k
0.1µF
20k
49.9Ω
100pF
30.1k
INTV_CC
100k
PGOOD
V_IN
2.2Ω 0.1µF
200Ω
CLKOUT V_IN
SENSE1^–
1nF
PLLIN
SENSE1⁺
FREQ
TG1
RUN
SW1
TK/SS
I_TH
V_FB
AVP
LTC3856
BOOST1
BG1
INTV_CC
INTV_CC
ITEMP
PHASMD
DIFFP
DIFFN
4.7µF
TG2
BOOST2
DIFFOUT
ISET
SW2
EXTV_CC
ILIM
BG2
SENSE2⁺
MODE
1nF
PGOOD PGND SGND SENSE2^–
200Ω
200Ω
Q1
RJK0305DPB
Q5
RJK0305DPB
0.1µF
Q2
RJK0330DPB
INTV_CC
CMDSH-3
Q3
RJK0305DPB
CMDSH-3
Q7
RJK0305DPB
INTV_CC
0.1µF
Q4
RJK0330DPB
200Ω
V_IN
22µF
22µF
L1
0.22µH
0.001Ω
Q6
RJK0330DPB
V_IN
22µF
22µF
L2
0.22µH
0.001Ω
Q8
RJK0330DPB
10Ω
3856 F19
Figure 19. 1.5V/50A Converter with AVP
V_IN
+
180µF
16V
s2
V_IN
4.5V
TO 14V
100µF
6.3V
s2
+
330µF
2.5V
s4
GND
V_OUT
1.5V/
50A
4.7µF
6.3V
10Ω
V_{O_SNS–}
V_{O_SNS+}
Related Parts
PART NUMBER
LTC3829
LTC3860
LTC3855
LTC3853
LTC3850/LTC3850-1/
LTC3850-2
DESCRIPTION
COMMENTS
3-Phase, Single Output, Synchronous Step-Down Controller
with Diffamp and DCR Temperature Compensation
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V
Dual, Multiphase, Synchronous Step-Down DC/DC Controller Operates with Power Blocks, DRMOS Devices or External
with Diffamp and Three-State Output Drive
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
Dual, Multiphase, Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed Frequency 250kHz to 770kHz,
with Diffamp and DCR Temperature Compensation
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 12V
Triple Output, Multiphase, Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 750kHz Frequency,
4V ≤ V_IN ≤ 24V, V_OUT3 Up to 13.5V
Dual 2-Phase, High Efficiency, Synchronous Step-Down
Phase-Lockable Fixed 250kHz to 780kHz Frequency,
DC/DC Controller, R_SENSE or DCR Current Sensing and Tracking 4V ≤ V_IN ≤ 30V, 0.8V ≤ V_OUT ≤ 5.25V
40 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3856f
LT 0510 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2010