SC2677B 查看數據表（PDF） - Semtech Corporation
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SC2677B Datasheet PDF : 19 Pages
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SC2677B
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless Specified: VCC = 4.75 to 5.25V, GND = PGND = 0V, FB = VO, TJ = 25°C, VBSTC = VBST = 12V
Parameter
Conditions
Under Voltage Latching off Threshold
Oscillator Frequency Range
Oscillator Frequency
Oscillator Max Duty Cycle
Phasing of DH2 and DH1
DH Sink Current
RSET = 5kohm
FOSC = 500kHz
VPHASING = 0.585V
DH - PGND = 3.5V
DH Sink Current
DH - PGND = 2.5V
DH Source Current
BSTH - DH = 3.75V
DH Source Current
BSTH - DH = 3V
DL Sink Current
DL - PGNG = 3.5V
DL Sink Current
DL - PGND = 2.5V
DL Source Current
BSTL - DL = 3.75V
DL Source Current
DH Minimum on Time
BSTL - DL = 3V
-40 to 0 oC
Dead Time
Soft Start Charge Current (2)
Note 5
Soft Start Enable
0% duty cycle
Soft Start End
Soft Start Transition Threshold(2)
100% duty cycle
Synchronous mode
OCP Trip Threshold
OCP Delay Time
From OCP detection to DH low
Input Offset (Current Sense Amplifier)
Input Bias Current
CS1+, CS1-, CS2+, CS2-
Power Good Threshold
Power Good Pull Down
VOUT ramping up
Sink Current = 2mA
Min
60
300
450
86
1.7
0.85
1.7
0.85
1.7
0.85
1.7
0.85
50
28
83%
Ty p
70
500
90
180
300
85
50
400
825
1.22
33
+/-3
88%
Max
80
1000
550
120
37
200
100
93%
0.4
Units
%
kHz
kHz
%
°
A
A
A
A
A
A
A
A
ns
ns
μA
mV
mV
V
mV
nS
mV
nA
VOUT
V
Notes:
(1) Measured from 50% to 50% pulse amplitude.
(2) The soft start pin sources 50μA to an external capacitor. The converter operates in synchronous mode
above the soft start transition threshold and in asynchronous mode below it.
(4) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(5) 120ns maximum at 70°C.
(6) Under pulsing condition, the negative voltage can be -5V for no more than 40ns measured from 50% falling to 50% rising.
© 2009 Semtech Corp.
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