E-L6919ETR STMicroelectronics, E-L6919ETR Datasheet - Page 30

• Manufacturer Part Number: E-L6919ETR
• Description: IC CTRLR 5BIT PROG 2PHASE 28SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of E-L6919ETR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 1.55 V
• Current - Output: 2A
• Frequency - Switching: 150kHz
• Voltage - Input: 5 ~ 12 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Power - Output: 2W
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 6.5 V
• Maximum Operating Temperature: 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4592-2

L6919E
DEMO BOARD ENHANCEMENTS: 1.200V / 52A CPU Power Supply
Considering the same application schematic, minor changes can be done to achieve the 52A thermal output
current required by AMD Hammer processor core. Part list has been modified as follow:
Part List
R2
R1, R20,R21
R3, R4, R5, R6
R7
R8
R9
R10
R11
R12 to R19
C1
C2
C3, C4
C5, C6, C7, C8
C9, C10
C11 to C13
C14 to C18
C24
L1, L2
U1
Q1, Q1a, Q3, Q3a
STATIC PERFORMANCES
Figure 28 shows the demo board measured efficiency versus load current in steady state conditions without air-
flow at ambient temperature.
Figure 28. System Efficiency
30/33
Q2, Q4
D1, D2
D3, D4
S0,S4
S1,S2,S3
147k
Not Mounted
1.5k
1k
1.8k
47k
510
82
0
Not Mounted
10n
100n
1
10 or 22 / 16V
1800 / 16V
2200 / 6.3V
100n
0.8
L6919E
SUB85N03-04P
SUB70N03-09BP
STPS340U
1N4148
Short
Open
90
85
80
75
70
65
60
55
50
45
40
0
5
10
15
20
Output Current [A]
25
1%
1%
1%
1%
Ceramic
TDK Multilayer Ceramic SMD 1206
Rubycon MBZ
Rubycon MBZ
77121 - 4Turns
STMicroelectronics
Vishay-Siliconix
Vishay-Siliconix
STMicroelectronics
STMicroelectronics
30
35
40
45
50
55
SMD 0806
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 1206
Radial 10x23
Radial 10x20
SMD 0805
SO28
D
D
SMB
SOT23
2
2
60
PACK
PACK