E-L6919ETR STMicroelectronics, E-L6919ETR Datasheet - Page 14

• 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
Figure 7. Output transient response without (a) and with (b) the droop function
Figure 8. Active Droop Function Circuit
The feedback current is equal to 50 A at nominal full load (I
threshold, so the maximum output voltage deviation is equal to:
REMOTE VOLTAGE SENSE
A remote sense buffer is integrated into the device to allow output voltage remote sense implementation without
any additional external components. In this way, the output voltage programmed is regulated between the re-
mote buffer inputs compensating motherboard trace losses or connector losses if the device is used for a VRM
module. The very low offset amplifier senses the output voltage remotely through the pins FBR and FBG (FBR
is for the regulated voltage sense while FBG is for the ground sense) and reports this voltage internally at VSEN
pin with unity gain eliminating the errors. Keeping the FBR and FBG traces parallel and guarded by a power
plane results in common mode coupling for any picked-up noise.
If remote sense is not required, it is enough connecting RFB directly to the regulated voltage: VSEN becomes
not connected and still senses the output voltage through the remote buffer. In this case the FBG and FBR pins
must be connected anyway to the regulated voltage (See figure 10).
The remote buffer is included in the trimming chain in order to achieve ±0.5% accuracy on the output voltage
when the RB Is used: eliminating it from the control loop causes the regulation error to be increased by the RB
offset worsening the device performances.
14/33
Droop function is provided only for positive load; if negative load is applied, and then I
sunk from the FB pin. The device regulates at the voltage programmed by the VID.
V
NOM
V
FULL_POSITIVE_LOAD
ESR DROP
(a)
= -R
COMP
COMP
FB
· 50 A
Ref
Ref
Total Current Info (I
Total Current Info (I
FB
FB
V
V
MAX
MIN
V
V
R
R
FB
DROOP
DROOP
FB
FB
= I
V
INFO1
OC_INTERVENTION
INFO1
INFO1
+I
+I
INFO2
INFO2
+ I
To V
To V
)
)
ESR DROP
INFO2
O UT
O UT
(b)
) and 70 A at the OC intervention
= -R
FB
INFOx
· 70 A
< 0, no current is
V
DROOP