L5994 STMicroelectronics, L5994 Datasheet - Page 3

• 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

BLOCK DIAGRAM
ELECTRICAL CHARACTERISTICS (V
DC CHARACTERISTIC
SECTION 1 PWM CONTROLLER
Symbol
H1STRAP
V
V
H1GATE
R1GATE
V
COMP1
H1SRC
PREG5
SREG5
V1SNS
W5SW
V
6
6
I1SNS
SGND
VREF
1out
I
I
-V
-V
2
2
in
VIN
5
5
6
5
7
1
32
31
30
29
4
2
3
12
13
Input supply voltage
Operating quiescent current
Stand by current
V1SNS feedback voltage
Overcurrent Threshold current
Pulse skipping mode threshold
voltage
SLOPE
REG5
Hside
Lside
VREF BUFFER
COMPARATOR
VREF
SWITCH
+
+
+
-
-
-
Parameter
THROUGH
CONTROL
SHOOT-
LOGIC
REGULATOR
AND
LINEAR
+
+
-
-
ERROR SUMMING
ZERO CROSSING
PULSE SKIPPING
V5SW
OVER CURRENT
COMPARATOR
COMPARATOR
COMPARATOR
VREF
4.7V
+
+
+
-
-
-
RUN2
in
= 12V; T
16
COMPARATOR
I1SNS
OVERVOLT
V1out,4V
R1GATE= R2GATE = OPEN
V
H1GATE = H2GATE = OPEN
RUN1= RUN2 = SREG5
(DRIVERS OFF)
RUNQ=RUN2=GND
NOSKIP=GND
Vin=12V
Vin=20V
NOSKIP = REG5
V
VSOFT1 = 3.1V
V
V
RUN1 PWROK1
in
i1sns
in
in
SOFT1
8
SOFT
11
= 5V to 20V
> 6.8V
< 5.8V
POWER MANAGEMENT
SYSTEM SUPERVISOR
-V
V1SNS
j
= 25°C; V
v1sns
Test Condition
10
&
V2SNS
NOSKIP
= 0 to 40mA
COMPARATOR
UNDERVOLT
SOFT2
SOFT
14
osc
17
I2SNS
CRST
= GND; unless otherwise specified.)
9
ZERO CROSSING
PULSE SKIPPING
OVER CURRENT
PWROK2
COMPARATOR
COMPARATOR
COMPARATOR
+
+
+
-
-
-
23
ERROR SUMMING
VREF
Min.
4.75
1.81
37
THROUGH
CONTROL
SYNCHRONIZATION
SHOOT-
LOGIC
AND
OSCILLATOR &
VREF
+
-
+
+
+
-
-
-
Typ.
1.89
REG12
1.1
6.5
50
60
50
13
LDO
L5994 - L5994A
PREG5
Hside
Lside
SLOPE
D98IN864A
Max.
1.97
100
1.4
25
90
63
19
20
18
24
25
26
27
28
21
22
15
I2SNS
V2SNS
COMP2
H2STRAP
H2GATE
H2SRC
R2GATE
PGND
VDRLIN
VFBLIN
OSC
Unit
mA
mV
mV
mV
V
V
A
A
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