LTC3834 Datasheet, PDF (9/28 Pages) Linear Technology – 30μA IQ Synchronous Step-Down Controller

LTC3834
PIN FUNCTIONS (FE/UFD)
operation. Tying this pin to a voltage greater than 0.9V and
less than INTV_CC selects pulse-skipping operation.
PHASMD (Pin 20/Pin 18): Control Input to Phase Selector
which determines the phase relationships between TG and
the CLKOUT signal.
Exposed Pad (Pin 21/Pin 21): SGND. Must be soldered
to the PCB.
FUNCTIONAL DIAGRAM
PLLIN/
MODE
F_IN
PHASMD
PHASE DET
R_LP ^PLLLPF
C_LP
INTV_CC
10k CLKOUT
OSCILLATOR
CLK
0.88V
PGOOD
V_FB1
0.72V
INTV_CC – 0.5V –
+
PLLIN/MODE
–
0.8V +
FC
BURSTEN
V_IN
V_IN
EXTV_CC
4.7V +
–
5.25V/
7.5V
LDO
INTV_CC
+
SGND
INTERNAL
SUPPLY
INTV_CC
V_IN
BOOST
D_B
DROP
OUT
DET
SQ
RQ
BOT FC
TOP ON
TG
TOP
SW
SWITCH
LOGIC
INTV_CC
BG
BOT
BURSTEN
0.4V + ^B
SLEEP
–
SHDN
PGND
ICMP
–
0.45V
2(V_FB)
SLOPE
COMP
0.5μA
IR
–
++ –
+
6mV
EA
OV
V_FB
TRACK/SS
0.80V
0.88V
SENSE⁺
SENSE^–
V_FB
I_TH
6V
RUN
SHDN
1μA
TRACK/SS
C_B
D
C_IN
C_OUT
L
R_SENSE
R_B
R_A
C_C
C_C2
R_C
C_SS
V_OUT
3834 FD
3834fb
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