LT3688 LINER [Linear Technology], LT3688 Datasheet - Page 9

• Manufacturer Part Number: LT3688
• Description: Dual 800mA Step-Down Switching Regulator with Power-On Reset
• Manufacturer: LINER [Linear Technology]

PIN FUNCTIONS
BLOCK DIAGRAM
C
between this pin and ground to set the power-on-reset
timeout period.
C
and ground to set the fast and slow watchdog timer periods.
OUT1
POR1
WDT
R1
R2
C2
(Pin 24/Pin 21): Place a capacitor between this pin
, C
L1
C3
POR2
(Pins 23, 21/Pins 20, 18): Place a capacitor
SW1
DA1
FB1
RUN/SS1
C
RST1
BST1
POR1
R
SEN1
+
2.5μA
22μA
OPERATION
–
+
Burst Mode
V
Q
SWITCH
DETECT
LATCH
C
(QFN/TSSOP)
CLAMP
RESET PULSE
ADJUSTABLE
GENERATOR
R
S
WDI
TRANSITION
DETECT
SLOPE COMP
OSCILLATOR
SLAVE
WDE
–
+
ON OFF
–
EN/UVLO
22μA
V
+
IN
+
–
CONFIGURATION
3.4V
WATCHDOG
INTERNAL
0.8V REF
C1
LOGIC
TIMER
C
V
80mV
WDT
IN
V
IN
OSCILLATOR
ERROR
2μA
MASTER
AMP
SYNC
+
–
Exposed Pad (Pin 25/Pin 25): Ground. Tie the exposed
pad directly to the ground plane. The exposed pad metal
of the package provides both electrical contact to ground
and good thermal contact to the printed circuit board. The
device must be soldered to the circuit board for proper
operation.
+ –
RT
R
WDO
T
SLOPE COMP
OSCILLATOR
OUT1
SLAVE
BIAS
–
+
V
C
RESET PULSE
THREE-STATE
ADJUSTABLE
GENERATOR
R
C
C
DECODE
C
CONFIG
OPERATION
Burst Mode
V
R
S
DETECT
C
SWITCH
LATCH
CLAMP
DISABLE
Q
GND
–
+
+
R
2.5μA
22μA
SEN2
RUN/SS2
C
BST2
RST2
SW2
POR2
DA2
FB2
LT3688
3688 BD01
C5
L2
C4
9
3688f
OUT2