ltc3834-1 Linear Technology Corporation, ltc3834-1 Datasheet - Page 8

• Manufacturer Part Number: ltc3834-1
• Description: 30?a Iq Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
LTC3834-1
ler functions, reducing the quiescent current that the
LTC3834-1 draws to approximately 4μA.
SENSE
Current Comparator.
SENSE
Current Comparator. The I
offsets between the SENSE
tion with R
PLLIN/MODE (Pin 16/Pin 16): External Synchronization
Input to Phase Detector and Forced Continuous Control
Input. When an external clock is applied to this pin, the
FU CTIO AL DIAGRA
8
U
U
–
+
(Pin 14/Pin 14): The (–) Input to the Differential
(Pin 15/Pin 15): The (+) Input to the Differential
U
SENSE
F
INTV
PLLIN/MODE
IN
V
IN
U
R
CC
+
LP
C
-0.5V
PLLIN/MODE
LP
set the current trip threshold.
PLLLPF
INTV
SGND
0.8V
V
IN
U
CC
+
+
–
–
(DHC Package/GN Package)
OSCILLATOR
PHASE DET
–
TH
INTERNAL
5.25V
LDO
SUPPLY
and SENSE
FC
BURSTEN
pin voltage and controlled
W
RUN
CLK
+
pins in conjunc-
0.5μA
6V
2(V
0.45V
FB
SLOPE
COMP
ICMP
)
S
R
+
–
Q
Q
0.4V
–
DROP
OUT
DET
+
–
+
+
B
6mV
BOT
TOP ON
phase-locked loop will force the rising TG signal to be
synchronized with the rising edge of the external clock. In
this case, an R-C filter must be connected to the PLLLPF
pin. When not synchronizing to an external clock, this
input determines how the LTC3834-1 operates at light
loads. Pulling this pin below 0.7V selects Burst Mode
operation. Tying this pin to INTV
inductor current operation. Tying this pin to a voltage
greater than 0.9V and less than INTV
skipping operation.
Exposed Pad (Pin 17, DHC Package): SGND. Must be
soldered to PCB.
BURSTEN
–
SLEEP
SHDN
FC
–
+
OV
IR
EA
SHDN
SWITCH
–
+
+
–
LOGIC
V
FB
TRACK/SS
0.80V
0.88V
TOP
BOT
1μA
INTV
CC
TRACK/SS
SENSE
SENSE
BOOST
PGND
SW
V
TG
BG
I
TH
FB
+
–
INTV
CC
D
C
B
R
B
C
C
A
R
C2
SS
C
L
B
C
V
IN
CC
R
R
D
SENSE
C
forces continuous
CC
selects pulse-
C
IN
38341f