Datasheet

LM2717-ADJ
SNVS407C –DECEMBER 2005–REVISED MARCH 2013 www.ti.com
Electrical Characteristics
Specifications in standard type face are for T
J
= 25°C and those with boldface type apply over the full Operating
Temperature Range (T
J
= −40°C to +125°C). V
IN
= 5V, I
L
= 0A, and F
SW
= 300kHz unless otherwise specified.
Min Typ Max
Symbol Parameter Conditions Units
(1) (2) (1)
I
Q
Total Quiescent Current (both Not Switching 2.7 6 mA
switchers)
Switching, switch open 6 12 mA
V
SHDN
= 0V 9 27 µA
V
BG
Bandgap Voltage 1.248 1.294
1.267 V
1.230 1.299
%V
BG
/ΔV
IN
Bandgap Voltage Line 0.01
-0.01 %/V
Regulation 0.125
V
FB1
Buck 1 Feedback Voltage 1.236 1.286
1.258 V
1.214 1.288
V
FB2
Buck 2 Feedback Voltage 1.236 1.286
1.258 V
1.214 1.288
I
CL1
(3)
Buck 1 Switch Current Limit V
IN
= 8V
(4)
2.2
A
V
IN
= 12V, V
OUT
= 3.3V 1.4 1.65 2.0
I
CL2
(3)
Buck 2 Switch Current Limit V
IN
= 8V
(4)
3.2
A
V
IN
= 12V, V
OUT
= 5V 2.6 3.05 3.5
I
B1
Buck 1 FB Pin Bias Current V
IN
= 20V
70 400 nA
(5)
I
B2
Buck 2 FB Pin Bias Current V
IN
= 20V
65 400 nA
(5)
V
IN
Input Voltage Range 4 20 V
g
m1
Buck 1 Error Amp ΔI = 20µA
1340 µmho
Transconductance
g
m2
Buck 2 Error Amp ΔI = 20µA
1360 µmho
Transconductance
A
V1
Buck 1 Error Amp Voltage
134 V/V
Gain
A
V2
Buck 2 Error Amp Voltage
136 V/V
Gain
D
MAX
Maximum Duty Cycle 89 93 %
F
SW
Switching Frequency R
F
= 46.4k 240 300 360 kHz
R
F
= 22.6k 480 600 720 kHz
I
SHDN1
Buck 1 Shutdown Pin Current 0V < V
SHDN1
< 7.5V −5 5 µA
I
SHDN2
Buck 2 Shutdown Pin Current 0V < V
SHDN2
< 7.5V −5 5 µA
I
L1
Buck 1 Switch Leakage V
IN
= 20V
0.01 5 µA
Current
I
L2
Buck 2 Switch Leakage V
IN
= 20V
0.01 5 µA
Current
R
DSON1
Buck 1 Switch R
DSON
(6)
I
SW
= 100mA 180
160 mΩ
300
R
DSON2
Buck 2 Switch R
DSON
(6)
I
SW
= 100mA 180
160 mΩ
300
Th
SHDN1
Buck 1 SHDN Threshold Output High 1.8 1.36
V
Output Low 1.33 0.7
(1) All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are
100% tested or specified through statistical analysis. All limits at temperature extremes are specified via correlation using standard
Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) Duty cycle affects current limit due to ramp generator.
(4) Current limit at 0% duty cycle. See TYPICAL PERFORMANCE section for Switch Current Limit vs. Input Voltage.
(5) Bias current flows into FB pin.
(6) Includes the bond wires and package leads, R
DSON
from V
IN
pin(s) to SW pin.
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