L5994 STMicroelectronics, L5994 Datasheet - Page 2

• Manufacturer Part Number: L5994
• Description: IC CTRLR PS ADJ TRPL-OUT 32-TQFP
• Manufacturer: STMicroelectronics

Specifications of L5994

• Pwm Type: Current Mode
• Number Of Outputs: 3
• Frequency - Max: 345kHz
• Duty Cycle: 96%
• Voltage - Supply: 4.75 V ~ 25 V
• Buck: Yes
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 140°C
• Package / Case: 32-TQFP, 32-VQFP
• Frequency-max: 345kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5994 - L5994A
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)
2/26
R
Symbol
Symbol
TH j-amb
V
V
T
in
j
i
Power Supply Voltage
Maximum pin voltage to pins 1,24,25,32
Thermal Resistance Junction to Ambient
Operative Junction Temperature Range
H1STRAP
COMP1
SREG5
V1SNS
SOFT1
I1SNS
V5SW
VIN
Parameters
Parameters
1
2
3
4
5
6
7
8
32
9 10
31
30
11 12 13 14 15 16
29 28 27 26 25
24
23
22
21
20
19
18
17
D98IN863B
H2STRAP
PWROK2
VFBLIN
VDRLIN
V2SNS
I2SNS
COMP2
SOFT2
-0.3 to (V
-40 to 140
0 to 27
Value
Value
60
in
+ 0.3)
°C/W
Unit
Unit
°C
V
V