E-L6911C STMicroelectronics, E-L6911C Datasheet - Page 15

• Manufacturer Part Number: E-L6911C
• Description: IC CTRLR 5BIT PROGR STPDN 20SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of E-L6911C

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.3 ~ 3.5 V
• Current - Output: 1.3A
• Frequency - Switching: 200kHz
• Voltage - Input: 5 ~ 12 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Efficiency
Figure 11 shows the measured efficiency versus load current for different values of output voltage. The measure
was done at Vin=5V for different values of the output voltage (2.05V and 2.75V). Two different measurements
were done using IC supply voltage of 5V and 12V.
In the application two mosfets STS12NF30L (30V, 10m
both the low and the high side.
The board has been layed out with the possibility to use up to three SO8 mosfets for both high and low side
switch. Two D
flexibility in meeting different requirements.
Figure 11. Efficiency vs. load
Load Transient Response
Figure 12 shows the demo board response to a load
transient application. The load transient applied
changes from 0A to 14A on the output current (Chan-
nel 4). It may be observed that output voltage (Chan-
nel 1) remains within the 100mV tolerance across the
regulated voltage. Figure 13 shows details about the
the circuit response during current rising and falling
edge; it is possible to observe that the duty cycle of
the Phase signal (Channel 2) goes up to 100% or
down to 0% if necessary.
Figure 12. Load Transient Response
95
90
85
80
75
70
65
60
55
0
2
PACK mosfets (one for each high and low side) may also be used in order to allow the maximum
2
Vcc = 12V; Vin = 5V
4
Out put Current [A]
6
Vout = 1.7V
Vout = 2.0V
Vout = 2.5V
8
10
12
14
16
Figure 13. Load Transient Response Details
typ @ Vgs=4.5V) connected in parallel are used for
95
90
85
80
75
70
65
60
55
0
2
4
Out put C ur r en t [ A ]
6
Vout = 1.7V
Vout = 2.0V
Vout = 2.5V
Vcc = Vin = 5V
8
10
12
14
16
L6911C
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