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参数资料
| 型号： | L4990D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 12/24页 |
| 文件大小： | 322K |
| 代理商： | L4990D |
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC
Supply Voltage (ICC < 50mA) (*)
selflimit
V
IOUT
Output Peak Pulse Current
1.5
A
Analog Inputs & Outputs (6,7)
-0.3 to 8
V
Analog Inputs & Outputs (1,2,3,4,5,15,14 13)
-0.3 to 6
V
Ptot
Power Dissipation @ Tamb =70
°C1
W
Tj
Junction Temperature, Operating Range
-25 to 125
°C
Tstg
Storage Temperature, Operating Range
-55 to 150
°C
(*) maximum package power dissipation limits must be observed
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal Resistance Junction to Ambient
DIP16
80
°C/W
Rth j-amb
Thermal Resistance Junction to Ambient
SO16
120
°C/W
PIN FUNCTIONS
N.
Name
Fun ction
1
SYNC
Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct
2
RCT
Oscillator pin for external Ct,Rt components
3
DC
Duty Cycle control
4
VREF
5.0V +/-1.5% reference voltage
5
VFB
Error Amplifier Inverting input
6
COMP
Error Amplifier Output
7
SS
Soft start pin for external capacitor Css
8VCC
Supply for internal ”Signal” circuitry
9VC
Supply for Power section
10
OUT
High current totem pole output
11
PGND
Power ground
12
SGND
Signal ground
13
ISEN
Current sense
14
DIS
Disable. It must never be left floating. Tie to SGND if not used.
15
DC-LIM
Connecting this pin to Vref, DC is limited to 50%. If it is left floating or grounded no limitation is
imposed
16
NC
Not connected
SYNC
RCT
DC
VREF
VFB
SS
COMP
1
3
2
4
5
6
7
OUT
SGND
PGND
ISEN
DIS
DC-LIM
N.C.
16
15
14
13
12
10
11
D95IN197
VCC
8VC
9
PIN CONNECTION
L4990 - L4990A
2/24
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