L4973D3.3-013TR STMicroelectronics, L4973D3.3-013TR Datasheet - Page 3

• Manufacturer Part Number: L4973D3.3-013TR
• Description: IC REG SW STEP DOWN 3.5A 20-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4973D3.3-013TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 0.5 ~ 50 V
• Current - Output: 3.5A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Power - Output: 4W
• Output Voltage: 5.1 V
• Output Current: 3.5 A
• Input Voltage: 8 V to 55 V
• Switching Frequency: 90 KHz to 110 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 97 %
• For Use With: 497-4743 - BOARD EVAL FOR L4973X SW REG
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3358-2

L4973
1
2
2.1
Block diagram
Figure 2.
Pin settings
Pin connection
Figure 3.
COMP
SYNC
VFB
SS
BOOT
GND
GND
GND
OSC
OUT
OUT
V
V
Pin x = Powerdip
Pin (x) = S020
CC
CC
5.1V
3.3V
17(19)
11(12)
12(13)
18(20)
ZERO CURRENT
10(11)
Block diagram
Pin connection (top view)
INHIBIT
DIP -18 (12+3+3)
+
-
INH
1
2
3
4
5
6
7
8
9
E/A
OSCILLATOR
D94IN162A
OSC
START
SOFT
1(1)
SHUTDOWN
GOOD
THERMAL
VREF
+
-
PWM
18
17
16
15
14
13
12
11
10
SYNC
SS
V5.1
GND
GND
GND
VFB
COMP
INH
5.1V
3.3V
(4,5,6,7,14,15,16,17)
4,5,6,13,14,15
HICCUP CURRENT
GND
CURRENT
LIMITING
LIMITING
REFERENCE
BOOT
INTERNAL
16(18)
GND
GND
GND
GND
OSC
OUT
OUT
V
V
CC
CC
R
S
V5.1
Q
Q
INTERNAL
1
2
3
4
5
6
7
8
9
10
SUPPLY
SO20 (12+4+4)
7(8)
D94IN163A
V
CC
OUT
DRIVER
5.1V
2(2)
8(9)
OUT
20
19
18
17
16
15
14
13
12
11
V
CC
Block diagram
3(3)
CHARGE
CBOOT
9(10)
D94IN161B
SYNC
SS
V5.1
GND
GND
GND
GND
VFB
COMP
INH
BOOT
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