UCD8220, UCD8620
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SLUS652B–MARCH 2005–REVISED SEPTEMBER 2005
ELECTRICAL CHARACTERISTICS
VDD = 12 V, 4.7-µF capacitor from VDD to AGND, 1 µF from PVDD to PGND, 0.22-µF capacitor from 3V3 to AGND,
TA = TJ = -40°C to 105°C, (unless otherwise noted).
PARAMETER
SUPPLY SECTION
TEST CONDITIONS
MIN
TYP
MAX UNIT
UCD8620
UCD8220
500
300
800
µA
Supply current, OFF
Supply current, ON
VDD = 4.2 V
500
(UCD8620), outputs not switching, CLK = low
(UCD8220), outputs not switching, CLK = low
2
2
3
mA
3
LOW VOLTAGE UNDERVOLTAGE LOCKOUT (UCD8220 only)
VDD UVLO ON
4.25
4.05
150
4.5
4.25
250
4.75
V
VDD UVLO OFF
4.45
VDD UVLO hysteresis
350
mV
110-V HIGH VOLTAGE UNDERVOLTAGE LOCKOUT AND JFET CONTROL (UCD8620 ONLY)
VDD UVLO ON
VDD UVLO OFF
12.5
7
13
7.5
13
12
1
13.5
8
JFET turn-off threshold (VSTART_JFET
JFET turn-on threshold
)
No switching, JFET on at startup
No switching
12.5
11.5
13.5
12.5
V
JFET on/off hysteresis
VDD < 5 V, VIN = 18 V to 76 V
VDD = 12 V, VIN = 18 V to 76 V
VDD = 5 V to 12 V
3
5
8
High voltage JFET current
mA
°C
10
145
125
(1)
Thermal shutdown, OFF
130
110
160
140
(1)
Thermal shutdown, ON
VDD > 5 V
REFERENCE / EXTERNAL BIAS SUPPLY
3V3 initial set point
TA = 25°C, ILOAD = 0
3.267
3.234
-
3.3
3.3
1
3.333
3.366
6.6
V
3V3 set point over temperature
3V3 load regulation
ILOAD = 1 mA to 10 mA, VDD = 5 V
VDD = 4.75 V to 12 V, ILOAD = 10 mA
VDD = 4.75 to 12 V
mV
mA
V
3V3 line regulation
-
1
6.6
Short circuit current
11
20
3.0
2.8
35
3V3 OK threshold, ON
3V3 OK threshold, OFF
CLOCK INPUT (CLK)
3.3 V rising
2.9
2.7
3.1
3.3 V falling
2.9
HIGH, positive-going input threshold
voltage (VIT+)
1.65
1.16
-
-
2.08
1.5
LOW negative-going input threshold
voltage (VIT-)
V
Input voltage hysteresis,
(VIT+ - VIT-)
0.6
-
-
-
0.8
Frequency
OUTx = 1 MHz
2
MHz
ns
(1)
Minimum allowable off time
20
SLOPE COMPENSATION (ISET)
ISET Voltage
VISET , 3V3 = 3.3 V, +/-2%
1.78
1.48
1.84
2.12
1.90
2.76
V
RISET = 6.19 kΩ to AGND, CS = 0.25 V, CTRL = 2.5 V
RISET = 100 kΩ to AGND, CS = 0.25 V, CTRL = 2.5 V
RISET = 499 kΩ to AGND, CS = 0.25 V, CTRL = 2.5 V
RISET = 4.99 kΩ to 3V3, CTRL = 2.5 V
m, VSLOPE (I-Mode)
m, VSLOPE (V-Mode)
0.099
0.019
1.44
0.142
0.028
2.06
0.185
0.037
2.68
V/µs
RISET = 100 kΩ to 3V3, CTRL = 2.5 V
0.079
0.019
0.114
0.027
0.148
0.035
RISET = 402 kΩ to 3v3, CTRL = 2.5 V
(1) Ensured by design. Not 100% tested in production.
6
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