Datasheet

LT8640/LT8640-1
3
Rev.C
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
2.9 3.4 V
V
IN
Quiescent Current V
EN/UV
= 0V
l
0.75
0.75
3
10
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
1.7
1.7
4
10
µA
µA
V
EN/UV
= 2V, Not Switching, V
SYNC
= 2V (LT8640 Only) 0.3 0.5 mA
V
IN
Current in Regulation V
OUT
= 0.97V, V
IN
= 6V, Output Load = 100µA
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 1mA
l
l
21
220
50
350
µA
µA
Feedback Reference Voltage V
IN
= 6V, I
LOAD
= 0.5A
V
IN
= 6V, I
LOAD
= 0.5A
l
0.964
0.958
0.970
0.970
0.976
0.982
V
V
Feedback Voltage Line Regulation V
IN
= 4.0V to 42V
l
0.004 0.02 %/V
Feedback Pin Input Current V
FB
= 1V –20 20 nA
BIAS Pin Current Consumption V
BIAS
= 3.3V, f
SW
= 2MHz 11 mA
Minimum On-Time I
LOAD
= 1.5A, SYNC = 0V
I
LOAD
= 1.5A, SYNC = 3.3V
l
l
35
30
50
50
ns
ns
Minimum Off-Time 80 110 ns
Oscillator Frequency R
T
= 221k
R
T
= 60.4k
R
T
= 18.2k
l
l
l
180
665
1.85
210
700
2.00
240
735
2.15
kHz
kHz
MHz
Top Power NMOS On-Resistance I
SW
= 1A 67 mΩ
Top Power NMOS Current Limit
l
7.5 10 12.5 A
Bottom Power NMOS On-Resistance V
INTVCC
= 3.4V, I
SW
= 1A 28 mΩ
SW Leakage Current V
IN
= 42V, V
SW
= 0V, 42V –15 15 µA
EN/UV Pin Threshold EN/UV Rising
l
0.94 1.0 1.06 V
EN/UV Pin Hysteresis 40 mV
EN/UV Pin Current V
EN/UV
= 2V –20 20 nA
PG Upper Threshold Offset from V
FB
V
FB
Falling
l
5 7.5 10.25 %
PG Lower Threshold Offset from V
FB
V
FB
Rising
l
–5.25 –8 –10.75 %
PG Hysteresis 0.2 %
PG Leakage V
PG
= 3.3V –40 40 nA
PG Pull-Down Resistance V
PG
= 0.1V
l
700 2000 Ω
SYNC/MODE Threshold SYNC/MODE DC and Clock Low Level Voltage
SYNC/MODE Clock High Level Voltage
SYNC/MODE DC High Level Voltage
0.7
1.0
2.3
0.9
1.2
2.6
1.1
1.4
2.9
V
V
V
Spread Spectrum Modulation
FrequencyRange
R
T
= 60.4k, V
SYNC
= 3.3V 22 %
Spread Spectrum Modulation Frequency V
SYNC
= 3.3V 3 kHz
TR/SS Source Current
l
1.2 1.9 2.6 µA
TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 200 Ω
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.