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Электронный компонент: L5994

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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
50
A (@ 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
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.
This is preliminary information on a new product now in development. Details are subject to change without notice.
September 1999
SYNC
POWER
MANAGEMENT
& SYSTEM
SUPERVISOR
5V
to
25V
2.5V
1.8V
POWER
SECTION
L5994
P
MEMORY
PERIPHERALS
12V LDO
5.1V LDO
3.39V REF
D98IN862
POWER GOOD
SYSTEM BLOCK DIAGRAM
TQFP32
ORDERING NUMBER: L5994
1/8
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
IN
Power Supply Voltage on V
IN
0 to 25
V
V
I
Maximum Pin Voltage to Pins 1, 24, 25, 32
-0.5 to (V
IN
+5)
V
I
IN
Input Current Except V13IN and V
IN
-1 to +1
mA
I
OUT
Output Current Digital Output
-15 to +15
mA
T
J
Junction Temperature
-55 to 150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
TH J-amb
Thermal Resistance Junction -Ambient
60
C/W
SLOPE
+
-
+
-
+
-
ERROR SUMMING
I1SNS
V1SNS
6
5
VREF
7
COMP1
1
32
31
H1STRAP
H1GATE
H1SRC
30
R1GATE
Hside
Lside
CONTROL
LOGIC
OVER CURRENT
COMPARATOR
ZERO CROSSING
COMPARATOR
PULSE SKIPPING
COMPARATOR
+
-
+
-
+
-
SOFT
I1SNS
V1SNS
8
SOFT1
SLOPE
+
-
+
-
+
-
ERROR SUMMING
I2SNS
V2SNS
19
20
VREF
18
COMP2
24
25
26
H2STRAP
H2GATE
H2SRC
27
28
R2GATE
PGND
Hside
Lside
CONTROL
LOGIC
OVER CURRENT
COMPARATOR
ZERO CROSSING
COMPARATOR
PULSE SKIPPING
COMPARATOR
+
-
+
-
+
-
SOFT
I2SNS
V2SNS
17
SOFT2
LINEAR
REGULATOR
SWITCH
COMPARATOR
V5SW
4.7V
W5SW
PREG5
29
SREG5
3
4
2
VIN
VREF
VREF BUFFER
OVERVOLT
COMPARATOR
UNDERVOLT
COMPARATOR
POWER MANAGEMENT
&
SYSTEM SUPERVISOR
12
VREF
13
SGND
13V
+
-
+
-
13V UV Comp
16
11
10
14
9
RUN2
RUN1 PWROK1
NOSKIP
CRST
V13IN
21
+
-
REG12
22
VREF
OSCILLATOR &
SYNCHRONIZATION
OSC
15
REG12
LDO
D98IN864
+
-
REG5
PREG5
23
PWROK2
BLOCK DIAGRAM
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
REG12
V2SNS
V13IN
D98IN863A
9
10
PIN CONNECTION (Top view)
L5994
2/8
PIN FUNCTIONS
N.
Name
Description
1
H1STRAP
Section 1 section bootstrap capacitor connection
2
V
IN
Device supply voltage. From 5.0 to 25V
3
SREG5
Signal 5V. It should be connected to PREG5 pin.
4
V1SW
Alternative device supply voltage.
5
V1SNS
This pin connects to the (-) input of the section 1 internal current sense comparator
6
I1SNS
This pin connects to the (+) input of the section 1 internal current sense comparator
7
COMP1
Feedback input for the section 1.
8
SOFT1
Soft-start input of the section 1. The soft-start time is programmed by an external capacitor
connected between this pin and SGND. Approximately, 1ms/nF @ full load.
9
CRST
Input used for start-up and shut-down timing. A capacitor defines a time of 2ms/nF.
10
PWROK1
Power-good diagnostic signal. This output is driven high when section 1 is enabled and
running properly, after a delay defined by the CRST capacitor.
11
RUN1
Control input to enable/disable the section 1. A high 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
ground with a 4.7
F 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 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, to ground or to 5V
for 200KHz operation. A proper external signal can synchronize the oscillator
16
RUN2
Control input to enable/disable the section 2. A high level (>2.4V) enables this section, a low
level (>0.8V) shuts it down.
17
SOFT2
Soft-start input for the section 2. The soft-start time is programmed by an external capacitor
connected between this pin and GND. Approximately, 1ms/nF @full load.
18
COMP2
Feedback input for the section 2.
19
I2SNS
This pin connects to the (+) input of the section 2 internal current sense comparator
20
V2SNS
This pin connects to the (-) input of the section 2 internal current sense comparator
21
V13IN
12V regulator input supply voltage, included between 13 and 20V. This voltage can be
supplied by a flyback winding.
22
REG12
12V regulator output voltage. It can source up to 150mA to an external load
23
PWROK2
Power good diagnostic signal. This output is driven high when section 2 is enabled and
running properly, after a delay defined by CRST capacitor
24
H2STRAP
Section 2 bootstrap capacitor connection
25
H2GATE
Gate- driver output for the section 2 high-side N-MOS
26
H2SRC
Section 2 high-side N-MOS source connection
27
R2GATE
Gate- driver output for the section 2 low- side N-MOS (synchronous rectifier).
28
PGND
Current return for drivers
29
PREG5
+5V regulator supply. Used mainly for bootstrap capacitors. It should be bypassed to ground.
30
R1GATE
Gate-driver output for the section 1 low-side N-MOS (synchronous rectifier).
31
H1SRC
Section 1 high-side N-MOS source connection
32
H1GATE
Gate-driver output for the section 1 high-side N-MOS
L5994
3/8
ELECTRICAL CHARACTERISTICS (V
IN
= 12V; T
J
= 25
C; V
OSC
= GND; unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DC CHARACTERISTICS
V
IN
Input Supply Voltage
5.0
25
V
I
2
Operating Quiescent Current
R1GATE = R2GATE = OPEN
H1GATE = H2GATE = OPEN
RUN2 = RUN1 = SREG5
(DRIVERS OFF )
1.35
mA
I
2
Stand-By Current
RUN2= RUN1 = GND
V
IN
= 12V
V
IN
= 20V
50
60
100
120
A
SECTION 1 PWM CONTROLLER
V
1OUT
(*)
V1SNS Feedback Voltage
V
IN
= 5.0 to 20V;
V
I1SNS
- V
V1SNS
= 0 to 40mV
1.843
1.9
1.957
V
V
6
- V
5
Over-Current Threshold Voltage
VSOFT1 = 4V
50
mV
V
6
- V
5
Pulse Skipping Mode
Thereshold Voltage
V
IN
> 6.8V
13
mV
V
IN
< 5.8V
6.5
mV
V
5
Over Voltage Threshold ON
V1SNS
1.99
2.052
2.11
V
Under Voltage Threshold ON
V1SNS
1.695
1.748
1.80
V
SECTION 2 PWM CONTROLLER
V
2OUT
(*)
V2SNS Feedback Voltage
V
IN
= 5.0 to 20V;
V
I2SNS
- V
V2SNS
= 0 to 40mV
1.610
1.66
1.709
V
V
19
- V
20
Over Current Threshold Voltage
VSOFT2 = 4V
50
mV
V
19
- V
20
Pulse Skipping Mode Threshold
Voltage
V
IN
= 5.0 to 20V;
13
mV
V
20
Over Voltage Threshold ON
V2SNS
1.738
1.792
1.845
V
Under Voltage Threshold ON
V2SNS
1.48
1.527
1.572
V
PWM CONTROLLERS CHARACTERISTICS (BOTH SECTIONS)
F
OSC
Switching Frequency Accuracy
OSC = SREG5/2
255
300
345
kHz
OSC = 0 or SREG5
170
200
230
kHz
V
15
Voltage Range for 300kHz
Operation
2.4
2.6
V
T
OFF
Dead Time
300
375
450
ns
T
OV
Overvoltage Propagation Time
V1SNS to PWROK or
V2SNS to PWROK
1.25
s
T
UV
Undervoltage Propagation Time
V1SNS to PWROK or
V2SNS to PWROK
1.5
s
V
5
, V
20
Output UVLO Threshold
Respect output voltage
70
%
I
8
, I
17
Soft Start Charge Current
3.2
4
4.8
A
V
8
, V
17
Soft Start Clamp Voltage
4
V
(*) Guaranteed by design, not tested in production
L5994
4/8
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
HIGH AND LOW SIDE GATE DRIVER (BOTH SECTIONS)
I
25
, I
27,
I
32
, I
30
Source Output Peak Current
C
LOAD
= 1nF
0.2
0.5
A
Sink Output Peak Current
C
LOAD
= 1nF
0.2
0.5
A
R
H
R
DSON
Resistance (or Impedance)
Driver OUT HIGH
7
R
L
R
DSON
resistance (or Impedance)
Driver OUT LOW
5
V
OH
Output High Voltage
HSTRAP = PREG5
I
SOURCE
= 10mA; HSRC = GND
4.40
5.3
5.61
V
V
OL
Output Low Voltage
HSTRAP = PREG5
I
SINK
= 10mA HSRC = GND
0.5
V
T
CC
Cross-Conduction Delay
30
75
130
ns
12V LINEAR REGULATOR SECTION
V
21
Input Voltage Range
13
20
V
V
22
Output Voltage
I
22
= 0 to 120mA
11.54
12.0
12.48
V
I
22
Current Limiting
V
REG12
= 12V
120
mA
Short Circuit Current
V
REG12
= 0V
150
mA
V
CP
Input Voltage Clamp
I
CLAMP
= 100
A
16
V
"One Shot" Activation Threshold
V
13IN
Falling
12.88
13.7
14.52
V
"One Shot" Pulse
1.5
s
INTERNAL REGULATOR (VPREG5) AND REFERENCE VOLTAGE
V
29
VREG5 Output Voltage
V
IN
= 5.0 to 20V
I
LOAD
= 0 to 5mA
5.0
5.3
5.61
V
I
29
Total Current Capability
VPREG5 = 5.3V
V
REG5
= 6V
25
70
mA
Switch-Over Threshold Voltage
4.3
4.53
4.7
V
V
12
Reference Voltage
2.5
V
V
IN
= 5.0 to 20V
I
LOAD
= 1 to 5mA
2.5
V
I
12
Source Current at Reference
Voltage
5
mA
POWER GOOD AND ENABLE FUNCTION
V
16
, V
11
RUN2, RUN1, Enable Voltage
HIGH LEVEL
2.4
V
V
16
, V
11
RUN2, RUN1, Disable Voltage
LOW LEVEL
0.8
V
T
10
Power Good Delay
C
CRST
= 100nF
160
200
240
ms
T
27
, T
30
Shutdown Delay Time before
Low Side Activation
(Except Over-Voltage Fault)
C
CRST
= 100nF,
160
200
240
ms
CRST Timing Rate
2
ms/nF
Power Good High Level
I
PWROK
= 40
A
4.1
V
Power Good LowLevel
I
PWROK
= 320
A
0.4
V
SYNCHRONIZATION
Synchronisation Pulse Width
400
ns
Synchronisation Input Voltage
(Falling Edge Transition)
5
V
L5994
5/8
18
L5994
20
19
28
27
26
25
24
3
2
VIN
1
29
6
5
13
7
22
4
32
14
11
16
31
21
30
15
VOUT3
12V
VOUT1
VOUT2
8
9
17
12
R13
R12
R11
R10
R14
S2
S1
S3
S4
C21
C23
C24
C22
PWROK1
R7
C19
C13
C14
C15
R3
R4
L2/T2
D2
Q4
Q3
C17
C25
D5
C4
C8
D4
C27
C18
C20
R5
C9
C10
C11
R1
R2
L1/T1
D1
Q2
C1
C7
Q1
D3
C16
C2
R6
R8
PWROK2
23
C26
PIN21
D6
PIN29
C6
C3
+5VIN
R15
10
R34
PIN29
R16
R9
R33
GND
GND
GND
D98IN866A
H1STRAP
H1GATE
H1SRC
PREG5
R1GATE
I1SNS
V1SNS
V5SW
COMP1
PWROK1
OSC
RUN2
NOSKIP
RUN1
H2STRAP
H2GATE
H2SRC
R2GATE
PGND
I2SNS
V13IN
V2SNS
COMP2
PWROK2
REG12
SOFT1
SOFT2
CRST
VREF
SREG5
VIN
SGND
G1
G2
GND
GND
R18
C29
R17
C28
R19
R20
NOSKIP
APPLICATION CIRCUIT
L5994
6/8
TQFP32
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
1.60
0.063
A1
0.05
0.15
0.002
0.006
A2
1.35
1.40
1.45
0.053
0.055
0.057
B
0.30
0.37
0.45
0.012
0.015
0.018
C
0.09
0.20
0.004
0.008
D
9.00
0.354
D1
7.00
0.276
D3
5.60
0.220
e
0.80
0.031
E
9.00
0.354
E1
7.00
0.276
E3
5.60
0.220
L
0.45
0.60
0.75
0.018
0.024
0.030
L1
1.00
0.039
K
0
(min.), 7
(max.)
A
A2
A1
B
Seatin g Plane
C
8
9
16
17
24
25
32
E3
D3
E1
E
D1
D
e
1
K
B
TQFP32
L
L1
0.10 mm
.0 04
OUTLINE AND
MECHANICAL DATA
L5994
7/8
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parti es which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
1999 STMicroelectronics Printed in Italy All Rights Reserved
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L5994
8/8