Datasheet

VOUT
FB
VIN
VCC
RT
7V
REGULATOR
Vin
HB
LEVEL
SHIFT
EN
5V
THERMAL
SHUTDOWN
L1
C8
LM5118
VCC UVLO
HB UVLO
ERROR
AMP
COMP
TRACK
and
HOLD
CLK
S
R
Q
Q
OSCILLATOR
AGND
CLK
CSG
CLK
RAMP GENERATOR
= 5 µA x Vin +
+
SHUTDOWN
AND
STANDBY
MODE
CONTROL
PWM
I-LIMIT
RAMP
SS
Vin
10 µA
C2
C1
Vin
C9
I
RAMP
BUCK-BOOST
MODE CONTROL
CS
PGND
LO
VOUT
HO
HS
1
2
3
4
5
14
6
15
10
13
12
20
19
18
3.9V
17
HICCUP MODE
FAULT TIMER
UVLO
VIN
7
8
9
16
VCCX
SYNC
11
D1
D2
R5
R6
Rs
Q1
Q2
C4
C5
R4
C6
R3
A=10
R8
C12
R1
R2
C1
1
R7
1.23V
C13
DISABLE
1.23V
I
RAMP
(buck-boost)
C3
C1
0
50 µA
3V
5 µA
I
RAMP
(buck)
= (5µA x (Vin -Vout)) +
50 µA
Vth
(buck) = 1.25V
(buck-boost) = 2.50V
Vth
10 Rs V/A
LM5118, LM5118-Q1
www.ti.com SNVS566H –APRIL 2008–REVISED JANUARY 2014
BLOCK DIAGRAM
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