E-L6919ETR STMicroelectronics, E-L6919ETR Datasheet - Page 24

• 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 Description
The L6919E demo board shows the operation of the device in a dual phase application. This evaluation board
allows output voltage adjustability (0.800V - 1.550V) through the switches S0-S4 and high output current capa-
bility.
The board has been laid out with the possibility to use up to two D
to give maximum flexibility in the mosfet choice.
The four layers demo board's copper thickness is of 70 m in order to minimize conduction losses considering
the high current that the circuit is able to deliver.
Demo board schematic circuit is reported in Figure 19.
Figure 19. Demo Board Schematic
Several jumpers allow setting different configurations for the device: JP3, JP4 and JP5 allow configuring the
remote buffer as desired. Simply shorting JP4 and JP5 the remote buffer is enabled and it senses the output
voltage on-board; to implement a real remote sense, leave these jumpers open and connect the FBG and FBR
connectors on the demo board to the remote load. To avoid using the remote buffer, simply short all the jumpers
JP3, JP4 and JP5. Local sense through the R7 is used for the regulation.
The input can be configured in different ways using the jumpers JP1, JP2 and JP6; these jumpers control also
the mosfet driver supply voltage. Anyway, power conversion starts from V
(See Figure 20).
Figure 20. Power supply configuration
24/33
GNDin
GNDcc
Vcc
Vin
JP6
S4
S3
S2
S1
S0
To pin
VCC
C5
L1
D1
GNDin
GNDcc
DZ1
JP1
Vcc
Vin
C4
Q1a
R21
D4
Q2
Q1
R16
R2
JP6
JP2
C8
R15
R18
R13
R6
R5
OSC / INH
PGNDS1
UGATE1
PHASE1
LGATE1
VCCDR
BOOT1
ISEN1
SGND
VID4
VID3
VID2
VID1
VID0
2
5
4
3
1
13
14
22
21
20
19
18
17
7
FBR
L6919E
11
DZ1
JP1
U1
12
FBG
JP2
24
25
26
27
16
15
28
23
10
6
9
8
VCC
BOOT2
UGATE2
PHASE2
LGATE2
ISEN2
PGNDS2
PGND
PGOOD
VSEN
FB
COMP
To BOOTx (HS Driver Supply)
R14
R17
R12
To Vcc pin
To HS Drains (Power Input)
C7
To VCCDR pin (LS Driver Supply)
R3
R11
R8
C2
R4
2
PACK mosfets for the low side switch in order
R7
Q4
Q3
D3
R10
C24
C1
Q3a
C3
IN
R9
JP3
D2
and the device is supplied from V
C6
L2
R1
C9,C10
C14,
C23
C11..C13
JP4
R19
R20
JP5
VoutCORE
GNDCORE
PGOOD
FBG
FBR
CC