US3018
Error Comparator Section
Input bias current
Input Offset Voltage
Delay to Output
Current Limit Section
C.S Threshold Set Current
C.S Comp Offset Voltage
Hiccup Duty Cycle
2
+2
100
uA
mV
nS
-2
-5
Vdiff=10mV
Css=0.1 uF
200
10
uA
mV
%
+5
Output Drivers Section
Rise Time
Fall Time
CL=3000pF
CL=3000pF
70
70
nS
nS
Dead band Time Between
High side and Synch Drive
Vcore Switcher Only
Oscillator Section (internal)
Osc Frequency
CL=3000pF
200
200
nS
Khz
2.5V Regulator (Vout 2)
Reference Voltage
Reference Voltage
Vo2
Ta=25, Vout2 = FB2
1.260
1.260
0.6
V
V
V
Dropout Voltage
Io = 200 mA
Load Regulation
Line Regulation
1mA< Io <200 mA
3.1V<Vin2<4V, Vo=2.5V
0.5
0.2
%
%
Input bias current
Output Current
Current limit
Thermal Shutdown
1.5V Regulator (Vout 3)
Reference Voltage
Reference Voltage
2
2
uA
mA
mA
°C
200
300
145
Vo3
Ta=25, GATE3 = FB3
1.260
1.260
V
V
uA
mA
Input bias current
Output Drive Current
Power Good Section
Core U.V lower trip point
Core U.V upper trip point
Core U.V Hysterises
Core O.V upper trip point
Core O.V lower trip point
Core O.V Hysterises
FB2 lower trip point
FB2 upper trip point
FB3 lower trip point
FB3 upper trip point
Power Good Output LO
Power Good Output HI
Fault (Overvoltage) Section
Core O.V upper trip point
Core O.V lower trip point
Vin2 upper trip point
Vin2 lower trip point
FAULT Output HI
50
Vsen1 ramping down
Vsen1 ramping up
0.90Vs
0.92Vs
.02Vs
1.10Vs
1.08Vs
.02Vs
0.95
1.05
0.95
1.05
0.4
V
V
V
V
V
V
V
V
V
V
V
V
Vsen1 ramping up
Vsen1 ramping down
FB2 ramping down
FB2 ramping up
FB3 ramping down
FB3 ramping up
RL=3mA
RL=5K pull up to 5V
4.8
Vsen1 ramping up
Vsen1 ramping down
Vin2 ramping up
Vin2 ramping down
Io=3mA
1.17Vs
1.15Vs
4.3
4.2
10
V
V
V
V
V
Soft Start Section
Pull up resistor to 5V
OCset=0V , Phase=5V
23
KW
Note 1: Vs refers to the set point voltage given in Table 1.
Rev. 1.4
12/8/00
4-3
UNISEM [ UNISEM ]
