LX1669 Просмотр технического описания (PDF) - Microsemi Corporation
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LX1669 Datasheet PDF : 14 Pages
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PRODUCT DATABOOK 1996/1997
PROGRAMMABLE DC:DC CONTROLLER
PR O D U C T I O N D ATA S H E E T
LX1669
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, 4.75V < VCC5 < 5.25V and 10.8V < VCC12 < 13.2V, 0°C ≤ TA ≤ 70°C. Test conditions: VCC5 = 5V, VCC12 = 12V, T = 25°C.)
Parameter
Symbol
Test Conditions
LX1669
Units
Min. Typ. Max.
Reference & DAC
Initial Accuracy
Cumulative Regulation Accuracy
Timing
VCORE
(Less 40mV output adaptive positioning), 1.3V ≤ VCORE ≤ 3.5V, TA = 25°C -1
1.3V ≤ VCORE ≤ 3.5V
-1.5
+1
%
1.5
%
Off Time
Switching Frequency
Error Comparator / CS-
OT
Freq
VCORE = 2.0V
VCORE = 1.3V to 3.5V
2.4
µs
250
kHz
Input Bias Current
EC Delay to Output
Current Sense +
IFB 1.0V < VSS = VFB < 3.5V
Overdrive ≤ 5mV
-0.3
-1
µA
100
ns
Input Resistance
Pulse By Pulse Current Limit
Current Sense Delay To Output
RCORE
VCLP
0V < VFB = VCORE < 3.5V
Overdrive ≤ 5mV
12
kΩ
45
60
mV
100
ns
Output Drivers
Drive Rise Time, Fall Time
Drive High
Drive Low
UVLO and Soft-Start (SS)
TRF CL = 3000pF
VDH
ISOURCE = 20mA
V DL
ISINK = 20mA
100
ns
10
11
V
0.1 0.2
V
VCC5 Start-Up Threshold
Hysteresis
VST
VCC12 > 3.9V
3.9 4.2 4.6
V
0.10
V
SS Resistor
SS Output Enable
Hiccup Duty Cycle
Supply Current
RSS
VEN
DCHIC
CSS = 0.1µF, VDAC = 2.00V, FREQ = 100Hz
18
kΩ
0.4 0.5
V
10
%
VCC12 Dynamic Supply Current
ICD Out Freq = 200kHz, CL = 3000pF, Synch., VSS > 0.5V
Static Supply Current
12V
IVCC12 VSS < 0.5V
5V
IVCC5 VSS < 0.5V
Power Good / Over-Voltage Protection (OVP)
24
mA
6
9
mA
13
18
mA
Threshold
Hysteresis
(VCORE / VSET) VCORE rising, VOUT2 ≥ 2.0V
(VCORE / VSET) VCORE falling, VOUT2 ≥ 2.0V
108 110 111
%
90
91
92
%
2
%
Power Good Voltage Low
Over-Voltage Threshold
OVP Sourcing Current
VID Pins
IPWRGD = 4mA
(VCORE / VSET), VCORE rising
VOVP = 2.0V
0.5 0.7
V
110 117 125
%
35
60
mA
Low Input
High Input
VIL Internally pulled up to VCC5 thru 30k
VIH
0.8
V
2.0
V
Copyright © 1999
Rev. 1.0 4/99
3
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