L5981 STMicroelectronics, L5981 Datasheet - Page 5

• Manufacturer Part Number: L5981
• Description: IC REG SW STEP DOWN 1A 8-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5981

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 18 V
• Current - Output: 1A
• Frequency - Switching: 250kHz ~ 1MHz
• Voltage - Input: 2.9 ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-VFQFN, 8-VFQFPN
• Power - Output: 1.5W
• Output Voltage: 3 V
• Output Current: 1 A
• Input Voltage: 2.9 V to 18 V
• Switching Frequency: 220 KHz to 275 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Low Dropout Operation: 100 % duty cycle
• For Use With: 497-6385 - BOARD EVAL FOR L5981
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5981
3
Electrical characteristics
T
Table 4.
Oscillator
Dynamic characteristics
DC characteristics
Inhibit
Soft-start
J
Symbol
V
R
I
= 25
V
QST-BY
V
CCHYS
F
V
DS(on)
F
CCON
V
T
I
FSW
LIM
ADJ
I
SW
D
CC
SS
FB
Q
°C, V
Operating input voltage
range
Turn on V
V
MOSFET on resistance
Maximum limiting current
Switching frequency
FSW pin voltage
Duty cycle
Adjustable switching
frequency
Feedback voltage
Quiescent current
Total stand-by quiescent
current
INH threshold voltage
INH current
Soft-start duration
CC
Electrical characteristics
CC
= 12 V, unless otherwise specified.
UVLO hysteresis
Parameter
CC
threshold
Doc ID 13004 Rev 6
(1)
(1)
(1)
(1)
(1)
R
2.9 V < V
Duty cycle = 0,
V
Device ON level
Device OFF level
INH = 0
FSW pin floating
F
R
SW
FB
FSW
FSW
= 0.8 V
Test condition
= 1 MHz,
= 33 kΩ
= 33 kΩ
CC
< 18 V
(1)
0.175
0.593
Min
225
220
1.9
2.9
1.5
7.4
0
Electrical characteristics
Values
1.254
1000
Typ
140
140
250
1.8
0.6
7.5
8.2
20
2
0.607
Max
170
220
275
275
100
2.9
0.3
2.1
2.4
0.6
9.1
18
30
10
Unit
kHz
kHz
mΩ
mA
ms
μA
μA
%
V
A
V
V
V
5/37