LTC3875_15 Datasheet, PDF (10/44 Pages) Linear Technology – Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation

LTC3875
Block Diagram (Functional diagram shows one channel only)
FREQ
MODE/PLLIN PHASMD TCOMP/ITEMP
PLL-SYNC
MODE/SYNC
DETECT
TEMPSNS
CLKOUT
IFAST
(CHANNEL 2
ONLY)
OSC
S
RQ
5k
–
I_CMP
+ ^IREV
ILIM
SLOPE
COMPENSATION
INTV_CC
UVLO
1
50k
I_THB
ACTIVE CLAMP
SLEEP
V_IN
0.6V
REF
0.55V
SS
EA
0.5V
EXTV_CC
4.7V
F
0.6V
5.5V
REG
F
FCNT
ON
BURST EN
SWITCH
LOGIC
AND
ANTISHOOT-
THROUGH
RUN
OV
RUN
1.22V
1.25µA
V_IN
INTV_CC
BOOST
+
V_IN
C_IN
TG
C_B
M1
SW
SNSA⁺
D_B
SNS^–
BG
M2
PGND
C_VCC
PGOOD
0.555V
UV
SNSD⁺
AMP
SNS^–
OV
0.66V
DIFFAMP
20k
20k
V_FB
20k
20k ^VOSNS–
1µA/5.5µA
ITH _RC CC1
RUN TK/SS CSS
V_OUT
+
C_OUT
R2
R1
SGND
V_OSNS+
TCOMP/ITEMP
ENTMPB
30µA
+
AMP
–
MIRROR
TRSET
R_TCOMP
*n EQUALS THE NUMBER
OF CHANNELS IN PARALLEL
TAVG
R_TCOMP
n*
+
g_m
–
REPEAT FOR
MULTICHIP OPERATIONS
3875 BD
3875fa
10
For more information www.linear.com/LTC3875