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PDF L5994 Data sheet ( Hoja de datos )
| Número de pieza | L5994 | |
| Descripción | ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L5994 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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® L5994
ADJUSTABLE TRIPLE OUTPUT
POWER SUPPLY CONTROLLER
PRODUCT PREVIEW
DUAL PWM BUCK CONTROLLERS
ADJUSTABLE
1.9V to 5V (Section 1)
1.66V to 3.5V (Section 2)
12V/120mA LINEAR REGULATOR
DUAL SYNCH RECTIFIERS DRIVERS
96% EFFICIENCY ACHIEVABLE
50µA (@ 12V) STAND BY CONSUMPTION
5.0V TO 25V SUPPLY VOLTAGE
EXCELLENT LOAD TRANSIENT RESPONSE
DISABLE PULSE SKIPPING FUNCTION
OUTPUT UNDERVOLTAGE SHUTDOWN
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 L5994 is a sophisticated dual PWM step-
down controller and power monitor intended for
SYSTEM BLOCK DIAGRAM
TQFP32
ORDERING NUMBER: L5994
Notebook computer and/or battery powered
equipment. The device produces regulated 1.8V,
2.5V (both adjustable) and 12V supplies for use in
portable 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.
The two high performance PWM controllers for
1.8V and 2.5V 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.
5V
to
25V
SYNC
L5994
D98IN862
POWER
MANAGEMENT
& SYSTEM
SUPERVISOR
POWER
SECTION
2.5V
1.8V
12V LDO
5.1V LDO
3.39V REF
POWER GOOD
µP
MEMORY
PERIPHERALS
September 1999
This is preliminary information on a new product now in development. Details are subject to change without notice.
1/8
1 page  
L5994
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
Min.
HIGH AND LOW SIDE GATE DRIVER (BOTH SECTIONS)
I25, I27,
I32, I30
RH
RL
VOH
VOL
TCC
Source Output Peak Current
Sink Output Peak Current
RDSON Resistance (or Impedance)
RDSON resistance (or Impedance)
Output High Voltage
Output Low Voltage
Cross-Conduction Delay
CLOAD = 1nF
CLOAD = 1nF
Driver OUT HIGH
Driver OUT LOW
HSTRAP = PREG5
ISOURCE = 10mA; HSRC = GND
HSTRAP = PREG5
ISINK = 10mA HSRC = GND
12V LINEAR REGULATOR SECTION
V21 Input Voltage Range
V22 Output Voltage
I22 = 0 to 120mA
I22 Current Limiting
VREG12 = 12V
Short Circuit Current
VREG12 = 0V
VCP Input Voltage Clamp
ICLAMP = 100µA
”One Shot” Activation Threshold V13IN Falling
”One Shot” Pulse
0.2
0.2
4.40
30
13
11.54
120
150
16
12.88
INTERNAL REGULATOR (VPREG5) AND REFERENCE VOLTAGE
V29 VREG5 Output Voltage
VIN = 5.0 to 20V
ILOAD = 0 to 5mA
I29 Total Current Capability
VPREG5 = 5.3V
VREG5 = 6V
Switch-Over Threshold Voltage
V12 Reference Voltage
VIN = 5.0 to 20V
ILOAD = 1 to 5mA
I12 Source Current at Reference
Voltage
POWER GOOD AND ENABLE FUNCTION
V16, V11 RUN2, RUN1, Enable Voltage HIGH LEVEL
V16, V11 RUN2, RUN1, Disable Voltage LOW LEVEL
T10
T27, T30
Power Good Delay
Shutdown Delay Time before
Low Side Activation
(Except Over-Voltage Fault)
CCRST = 100nF
CCRST = 100nF,
CRST Timing Rate
Power Good High Level
Power Good LowLevel
SYNCHRONIZATION
IPWROK = 40µA
IPWROK = 320µA
Synchronisation Pulse Width
Synchronisation Input Voltage
(Falling Edge Transition)
5.0
25
70
4.3
5
2.4
160
160
4.1
400
5
Typ.
0.5
0.5
5.3
75
12.0
13.7
5.3
4.53
2.5
2.5
200
200
2
Max. Unit
7
5
5.61
0.5
130
A
A
Ω
Ω
V
V
ns
20
12.48
14.52
1.5
V
V
mA
mA
V
V
µs
5.61 V
mA
4.7 V
V
V
mA
V
0.8 V
240 ms
240 ms
ms/nF
V
0.4 V
ns
V
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L5994.PDF ] | |
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