Electrical Characteristics: Unless otherwise stated, specifications apply for -40°C < TA < 85°C, -40°C < TJ < 150°C,
3V < VC < 20V, 8.2V < VCC < 20V, RT = 12kΩ, CT = 390pF.
PARAMETER
ꢀ SLOPE Compensation
Charge Current
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SLOPE = 2V
-63
-53
-43
µA
COMP Gain
Fraction of slope voltage added
to ISENSE (Note 1)
0.095
0.100
0.105
V/V
Discharge Voltage
SYNC = 0V
0.1
0.2
V
ꢀ Current Sense
OFFSET Voltage
(Note 1)
0.09
0.10
55
0.11
160
2.2
V
ns
Blanking Time
Blanking Disable Voltage
Second Current Threshold Gain
Adjust VFB
1.8
2
V
1.21
1.33
5
1.45
V/V
kΩ
ns
ISENSE Input Resistance
Minimum On Time
Gain
GATE High to Low
(Note 1)
30
70
110
0.78
0.80
0.82
V/V
ꢀ OV & UV Voltage Monitors
OV Monitor Threshold
OV Hysteresis Current
UV Monitor Threshold
UV Monitor Hysteresis
2.4
-10
1.38
25
2.5
-12.5
1.45
75
2.6
-15
V
µA
V
1.52
100
mV
ꢀ SOFT START (SS)
Charge Current
SS = 2V
SS = 2V
-70
250
4.4
-55
1000
4.7
-40
µA
µA
V
Discharge Current
Charge Voltage, VSS
Discharge Voltage, VSS
5
0.25
0.27
0.30
V
Note 1: Guaranteed by Design, not 100% tested in production.
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
16L PDIP & SO Narrow
1
2
GATE
ISENSE
External power switch driver with 1.0A peak capability.
Current sense amplifier input.
3
SYNC
Bi-directional synchronization. Locks to the highest frequency.
(CS51021/23)
3
SLEEP
(CS51022/24)
Active high chip disable. In sleep mode, VREF and GATE are
turned off.
4
SLOPE
Additional slope to the current sense signal. Internal current
source charges the external capacitor.
5
6
UV
OV
Undervoltage protection monitor.
Overvoltage protection monitor.
4
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
