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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： | 23/26页 |
| 文件大小： | 322K |
| 代理商： | L5994A |
Obsolete
Product(s)
- Obsolete
Product(s)
L5994 - L5994A
6/26
PIN DESCRIPTION
N°
Name
Function
1
H1STRAP
Section 1 bootstrap capacitor connection. A bootstrap capacitor must be connected between
this pin and pin H1SRC to supply the H1GATE driver.
2
Vin
Device supply voltage.
3
SREG5
Internal logic supply. It must be connected to PREG5 pin through a R-C low-pass filter.
4
V5SW
Alternative supply voltage for the internal 5V regulator. If its voltage is greater than 4.5V, the
internal regulator is supplied via this pin. If left floating, the regulator is supplied through the
Vin pin.
5
V1SNS
This pin connects the (-) input of section 1 current sense comparator. It must be connected
downstream the external RSENSE resistor.
6
I1SNS
This pin connects the (+) input of section 1 current sense comparator. It must be connected
upstream the external RSENSE resistor.
7
COMP1
Feedback input for section 1. It must be connected directly or through a resistor divider to the
output of the section 1.
8
SOFT1
Soft start connection for section 1. The soft start time is programmed by an external capacitor
connected between this pin and SGND. Approximatively 0.7ms/nF.
9
CRST
Used for start-up and shut-down timing. A capacitor must be connected between this pin and
SGND defining a time of 1.47ms/nF.
10
PWROK1
Power Good open drain diagnostic signal. This output is in high inpedence when sect. 1 is
enabled and running properly after a delay defined by the CRST capacitor. When not used
may be left floating.
11
RUN1
Control input to enable / disable the section 1. A high logic level (>2.4V) enables this section,
a low level (<0.8V) shuts it down.
12
Vref
Internal 2.5V high accuracy voltage generator. It can source 5mA to external load. Bypass to
SGND with a 4.7uF electrolytic capacitor to reduce noise.
13
SGND
Signal ground. Reference for internal logic circuitry. It must be routed separately from high
current returns.
14
NOSKIP
Pulse skipping mode control. A high logic level (>2.4V) disables pulse skipping at low load
current, a low level (<0.8V) enables it.
15
OSC
Oscillator frequency control: connect to 2.5V to select 300kHz operation, connect to ground or
to 5V for 200kHz operation.
A proper external signal can synchronise the oscillator
16
RUN2
Control input to enable / disable the section 2. A high logic level (>2.4V) enables this section,
a low level (<0.8V) shuts it down.
17
SOFT2
Soft start connection for section 2. The soft start time is programmed by an external capacitor
connected between this pin and SGND. Approximatively 0.7ms/nF.
18
COMP2
Feedback input for section 2. It must be connected directly or through a resistor divider to the
output of the section 2.
19
I2SNS
This pin connects the (+) input of section 2 current sense comparator. It must be connected
upstream the external RSENSE resistor.
20
V2SNS
This pin connects the (-) input of section 2 current sense comparator. It must be connected
downstream the external RSENSE resistor.
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