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STMicroelectronics Electronic Components Datasheet

L4992 Datasheet

TRIPLE OUTPUT POWER SUPPLY CONTROLLER

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® L4992
TRIPLE OUTPUT POWER SUPPLY CONTROLLER
DUAL PWM BUCK CONTROLLERS (3.3V
and 5.1V)
12V/120mA LINEAR REGULATOR
DUAL SYNCH RECTIFIERS DRIVERS
96% EFFICIENCY ACHIEVABLE
50µA (@ 12V) STAND BY CONSUMPTION
5.5V TO 25V SUPPLY VOLTAGE
EXCELLENT LOAD TRANSIENT RESPONSE
DISABLE PULSE SKIPPING FUNCTION
POWER MANAGEMENT:
- UNDER AND OVERVOLTAGE OUTPUT
DETECTION
- POWER GOOD SIGNAL
- SEPARATED DISABLE
THERMAL SHUTDOWN
PACKAGE: TQFP32
APPLICATION
NOTEBOOK AND SUBNOTEBOOK COM-
PUTERS
PEN TOP AND PORTABLE EQUIPMENT
COMMUNICATING COMPUTERS
DESCRIPTION
The L4992 is a sophisticated dual PWM step-
down controller and power monitor intended for
Notebook computer and/or battery powered
equipment. The device produces regulated
+3.3V, +5.1V and 12V supplies for use in portable
SYSTEM BLOCK DIAGRAM
TQFP32
ORDERING NUMBER: L4992
and PCMCIA applications.
The internal architecture allows to operate with
minimum external components count. A very high
switching frequency (200/300 KHz or externally
synchronizable) optimizes their physical dimen-
sions.
Synchronous rectification and pulse skipping
mode for the buck sections optimise the overall
efficiency over a wide load current range (96% ef-
ficiency @1A/5.1V and 93% efficiency @
0.05A/5.1V.
The two high performance PWM controllers for
+3.3V and +5.1V lines are monitored for overvol-
tage, undervoltage and overcurrent conditions.
On detection of a fault, a 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 quies-
cent consumption of the IC in stand-by conditions.
5.5V
to
25V
SYNC
L4992
D96IN429A
June 2000
POWER
MANAGEMENT
& SYSTEM
SUPERVISOR
POWER
SECTION
3.3V
5.1V
12V LDO
5.1V LDO
3.39V REF
POWER GOOD
µP
MEMORY
PERIPHERALS
1/26


STMicroelectronics Electronic Components Datasheet

L4992 Datasheet

TRIPLE OUTPUT POWER SUPPLY CONTROLLER

No Preview Available !

L4992
ABSOLUTE MAXIMUM RATINGS
Symbol
VIN
VI
IIN
IOUT
TJ
Parameter
Power Supply Voltage on VIN
Maximum Pin Voltage to Pins 1, 24, 25, 32
Input Current Except V13IN and VIN
Output Current Digital Output
Junction Temperature
THERMAL DATA
Symbol
RTH J-amb
Parameter
Thermal Resistance Junction -Ambient
PIN CONNECTION (Top view)
Value
0 to 25
-0.5 to (VIN +5)
-1 to +1
-15 to +15
-55 to 150
Value
60
Unit
V
V
mA
mA
°C
Unit
°C/W
H5STRAP
VIN
REG5
V5SW
V5SNS
I5SNS
COMP5
SOFT5
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
H3STRAP
(*)
REG12
V13IN
V3SNS
I3SNS
COMP3
SOFT3
D96IN377
(*)TO BE CONNECTED TO PIN13
BLOCK DIAGRAM
SOFT5
SOFT3
8 17
I5SNS
V5SNS
COMP5
6
5
7
SLOPE
+
ERROR SUMMING
-
+
-
+
SOFT
SOFT
I5SNS V5SNS V3SNS I3SNS
ERROR SUMMING
+
-
+
-
+
SLOPE
19
I3SNS
20
V3SNS
18
COMP3
1
H5STRAP
-
VREF
OVER CURRENT
COMPARATOR
+
OVER CURRENT
COMPARATOR
+
-
VREF
24
H3STRAP
32
H5GATE
31
H5SRC
Hside
REG5
CONTROL
LOGIC
-
ZERO CROSSING
COMPARATOR
+
-
-
ZERO CROSSING
COMPARATOR
+
-
CONTROL
LOGIC
Hside
REG5
25
H3GATE
26
H3SRC
R5GATE
PGND5
30
29
Lside
PULSE SKIPPING
COMPARATOR
+
-
PULSE SKIPPING
COMPARATOR
+
-
Lside
27
R3GATE
28
PGND3
REG5
3
W5SW
VIN
4
2
VREF 12
SGND
13
LINEAR
REGULATOR
-
+
SWITCH
COMPARATOR
VREF BUFFER
+
-
V5SNS
OVERVOLT
COMPARATOR
UNDERVOLT
COMPARATOR
4.7V
POWER MANAGEMENT
&
SYSTEM SUPERVISOR
VREF
16 11 10
14 9
RUN3 RUN5 PWROK NOSKIP CRST
13V UV Comp
+
-
13V
21
V13IN
VREF
+
-
OSCILLATOR &
SYNCHRONIZATION
22
REG12
LDO
REG12
15
OSC
D96IN375
2/26


Part Number L4992
Description TRIPLE OUTPUT POWER SUPPLY CONTROLLER
Maker STMicroelectronics
Total Page 26 Pages
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