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参数资料
| 型号： | L5994A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封装： | TQFP-32 |
| 文件页数： | 12/26页 |
| 文件大小： | 322K |
| 代理商： | L5994A |
Obsolete
Product(s)
- Obsolete
Product(s)
L5994 - L5994A
2/26
DESCRIPTION (continued)
The device produces an adjustable regulated voltage in both sections and a linear regulated voltage with an
external bipolar such as for PCMCIA applications.
The auxiliary linear driver is able to source up to 1A for 12V bus and is also possible to use it for the regulation
of 2.5V from 5V bus.
Synchronous rectification and pulse skipping mode for the buck sections optimise the overall efficiency over a
wide load current range.
The two high performance PWM output sections are monitored for over voltage, under voltage and over current
conditions.
A POWER GOOD signal is provided for each section.
On detection of a fault, the relevant POWER GOOD signal is generated and a specific shutdown procedure
takes place to prevent physical damage and data corruption.
A disable function allows to manage the output power sections separately, optimising the quiescent consump-
tion of the IC in stand-by conditions.
The internal architecture is a current mode that allows to have fast transient response without compromise the
efficiency due to the ultra low sense resistor.
Under voltage shutdown is forced in case of short circuit in one of the two sections.
The drivers are provided of an adaptative anti cross conduction system for high output current application
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTIONS (Top views)
Symbol
Parameters
Value
Unit
Vin
Power Supply Voltage
0 to 27
V
Vi
Maximum pin voltage to pins 1,24,25,32
-0.3 to (Vin + 0.3)
V
Symbol
Parameters
Value
Unit
RTH j-amb
Thermal Resistance Junction to Ambient
60
°C/W
Tj
Operative Junction Temperature Range
-40 to 140
°C
1
2
3
5
6
4
7
8
11 12 13 14 15 16
32
30
31
29 28 27 26 25
19
18
17
24
23
22
20
21
I1SNS
V1SNS
V5SW
VIN
H1STRAP
SREG5
COMP1
SOFT1
CRST
RUN1
PWROK1
VREF
SGND
NOSKIP
OSC
RUN2
H1GATE
R1GATE
H1SRC
PREG5
PGND
R2GATE
H2SRC
H2GATE
I2SNS
COMP2
SOFT2
H2STRAP
PWROK2
VFBLIN
V2SNS
VDRLIN
D98IN863B
910
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