6
8
20
30
V14 = 0, Pin2 = open
Tj = 25°C
04 8
12 16 20 24
0
0.05
0.1
0.15
0.2
4
Vcc [V]
Iq [mA]
28
X
Y
Figure 1. L5991 - Quiescent current vs. input
voltage.
(X = 7.6V and Y= 8.4V for L5991A)
0 4 8 12 16 20 24
0
50
100
150
200
250
300
350
Vcc [V]
Iq [µA]
V14 = Vref
Tj = 25 °C
X
Y
Figure 2. L5991 - Quiescent current vs. input
voltage (after disable).
(X = 7.6V and Y= 8.4V for L5991A)
ELECTRICAL CHARACTERISTICS
(continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
OUTPUT SECTION
Fall Time C
O
= 1nF
C
O
= 2.5nF
20
35
60 ns
ns
Rise Time C
O
= 1nF
C
O
= 2.5nF
50
70
100 ns
ns
UVLO Saturation V
CC
= V
C
= 0 to V
CCON;
I
sink
= 10mA 1.0 V
SUPPLY SECTION
V
CCON
Startup voltage
L5991
L5991A
14
7.8
15
8.4
16
9
V
V
V
CCOFF
Minimum Operating
Voltage
L5991
L5991A
9
7
10
7.6
11
8.2
V
V
V
hys
UVLO Hysteresis
L5991
L5991A
4.5
0.5
5
0.8
V
V
I
S
Start Up Current Before Turn-on at:
V
CC
= V
C
= V
CCON
-0.5V
40 75 120 µA
I
op
Operating Current C
T
= 1nF, R
T
= 13.3kΩ, C
O
=1nF 9 13 mA
I
q
Quiescent Current (After turn on), CT = 1nF,
R
T
= 13.3kΩ, C
O
=0nF
7.0 10 mA
V
Z
Zener Voltage I
8
= 20mA 21 25 30 V
STANDBY FUNCTION
V
REF
-V
ST-BY
I
ST-BY
= 2mA 45 mV
V
T1
Standby Threshold V
comp
Falling 2.5 V
V
comp
Rising 4.0 V
SYNCHRONIZATION SECTION
Master Operation
V
1
Clock Amplitude I
SOURCE
= 0.8mA 4 V
I
1
Clock Source Current Vclock = 3.5V 3 7 mA
Slave Operation
V
1
Sync Pulse Low Level 1 V
High Level 3.5 V
I
1
Sync Pulse Current VSYNC = 3.5V 0.5 mA
OVER CURRENT PROTECTION
V
t
Fault Threshold Voltage 1.1 1.2 1.3 V
DISABLE SECTION
Shutdown threshold 2.4 2.5 2.6 V
Input Bias Current V
pin14
= 0 to 3V -1 1 µA
I
qSH
Quiescent current After
Disable
V
CC
= 15V 330 µA
L5991 - L5991A
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