Datasheet

LM2677
SNVS077I –MAY 2004–REVISED JUNE 2012 www.ti.com
LM2677-ADJ Electrical Characteristics
Symbol Parameter Conditions Typ
(1)
Min
(2)
Max
(2)
Units
V
FB
Feedback Voltage V
IN
= 8V to 40V, 100mA ≤ I
OUT
≤ 5A 1.186 1.234
1.21 V
V
OUT
Programmed for 5V 1.174 1.246
η Efficiency V
IN
= 12V, I
LOAD
= 5A 84 %
(1) Typical values are determined with T
A
= T
J
= 25°C and represent the most likely norm.
(2) All limits are specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature
limits are 100% tested during production with T
A
= T
J
= 25°C. All limits at temperature extremes are guaranteed via correlation using
standard standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
All Output Voltage Versions Electrical Characteristics
Limits appearing in bold type face apply over the entire junction temperature range of operation, −40°C to 125°C.
Specifications appearing in normal type apply for T
A
= T
J
= 25°C. Unless otherwise specified V
IN
=12V for the 3.3V, 5V and
Adjustable versions and V
IN
=24V for the 12V version, Sync pin open circuited..
Symbol Parameter Conditions Typ Min Max Units
DEVICE PARAMETERS
I
Q
Quiescent Current V
FEEDBACK
= 8V For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK
= 15V For 12V Versions 4.2 6 mA
I
STBY
Standby Quiescent ON/OFF Pin = 0V 100
50 μA
Current 150
I
CL
Current Limit 6.1 8.3
7 A
5.75 8.75
I
L
Output Leakage V
IN
= 40V, ON/OFF Pin = 0V 200
1 μA
Current V
SWITCH
= 0V 15
V
SWITCH
= −1V 6 mA
R
DS(ON)
Switch On- I
SWITCH
= 5A 0.14
0.12 Ω
Resistance 0.225
f
O
Oscillator Measured at Switch Pin
260 225 280 kHz
Frequency
D Duty Cycle Maximum Duty Cycle 91 %
Minimum Duty Cycle 0 %
I
BIAS
Feedback Bias V
FEEDBACK
= 1.3V
85 nA
Current ADJ Version Only
V
ON/OFF
ON/OFF Threshold
1.4 0.8 2.0 V
Voltage
I
ON/OFF
ON/OFF Input ON/OFF Input = 0V
20 45 μA
Current
F
SYNC
Synchronization V
SYNC
(Pin 5)=3.5V, 50% Duty Cycle
400 KHz
Frequency
V
SYNC
SYNC Threshold
1.4 V
Voltage
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