LTC3499_15 Datasheet, PDF (7/16 Pages) Linear Technology – 750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

FUNCTIONAL BLOCK DIAGRAM
V_IN ⁺
C_IN
1.8V TO 5.5V
L
REVERSE-BATTERY COMPARATOR
2
V_IN
ANTI-RING
250Ω
3
SW
+
0.7V
–
1 = CLOSED
1 = CLOSED
V_OUT
6.8V
OV COMPARATOR
+
1 = OFF
–
ENABLE
THERMAL SD
SLEEP
PWM
LOGIC
AND
DRIVERS
LTC3499/LTC3499B
V_SELECT
ERROR AMPLIFIER
V_{OUT 6}
1.22V
C_FF
(OPTIONAL)
FB
7
R1
C_OUT
R2
I_ZERO
1.2MHz
OSCILLATOR
SLOPE
COMPENSATION
Σ
SHDN –
1
+
0.8V
PWM COMPARATOR
CURRENT LIMIT COMPARATOR
REFERENCE
BIAS
UVLO
SD
ENABLE
SLEEP
1A
TYP
Burst Mode
CONTROL
(LTC3499 ONLY)
ENABLE
TSD
GND
4
Figure 1: Functional Block Diagram
VC
8
C_C1
C_C2
RZ
3µA
SS
5
5k
C_SS
3499 F01
3499fc
7