Datasheet

LTC3499/LTC3499B
7
3499fc
FUNCTIONAL BLOCK DIAGRAM
GND
3499 F01
4
V
OUT
V
SELECT
C
SS
C
OUT
SS
VC
C
C1
RZ
C
C2
Σ
–
+
OV COMPARATOR
REVERSE-BATTERY COMPARATOR
1 = OFF
C
FF
(OPTIONAL)
FB
–
+
–
+
–
+
–
+
–
+
–
+
ENABLE
TSD
PWM COMPARATOR
ENABLE
SD
SLEEP
3µA
1.22V
R1
R2
Burst Mode
CONTROL
(LTC3499 ONLY)
1.2MHz
OSCILLATOR
SLOPE
COMPENSATION
PWM
LOGIC
AND
DRIVERS
SHDN
REFERENCE
BIAS
UVLO
CURRENT LIMIT COMPARATOR
0.8V
1A
TYP
I
ZERO
SW
L
3
V
IN
ANTI-RING
250Ω
C
IN
V
IN
1.8V TO 5.5V
2
+
6
8
7
SLEEP
ENABLE
THERMAL SD
V
OUT
6.8V
–
+
1 = CLOSED 1 = CLOSED
ERROR AMPLIFIER
0.7V
1
–
+
5k
5
Figure 1: Functional Block Diagram