Electrical Characteristics: 5V ≤ VIN ≤ 26V and -40°C ≤ TJ ≤ 150°C, COUT=100µF(ESR ≤ 8Ω), CDelay = 0.1µF, RBIAS = 64.9k,
OSC = 390 pF, CCOMP = 0.1µF unless otherwise specified.
C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ꢀ Watchdog Input (WDI)
VIH
Peak WDI needed to activate
2.0
V
V
RESET
VIL
0.8
25
Hysteresis
Note 1
50
50
mV
kΩ
ms
V
Pull-Up Resistor
Low Threshold
Floating Input Voltage
WDI Pulse Width
WDI=0V
20
100
6.25
3.5
8.78
11.0
5
µs
ꢀ Switcher Section
Minimum Operating
Input Voltage
5.0
V
Switching Frequency
Refer to Figure 1d.
80
0.7
1.4
120
95
110
1.6
2.5
kHz
V
Switch Saturation Voltage
Output Current Limit
Max Switching Frequency
ISW = 1.4A
1.1
A
VSW = 7.5V with 50Ω load,
kHz
Refer to Figure 1d.
VFB1 Regulation Voltage
VFB2 Regulation Voltage
VFB1, VFB2 Input Current
Oscillator Charge Current
1.206
1.206
1.25
1.25
1.294
1.294
1
V
V
VFB1 = VFB2 = 5V
COSC = 0V
µA
µA
µA
µA
%
35
270
35
40
320
40
45
Oscillator Discharge Current COSC = 4V
370
45
CDelay Charge Current
CDelay = 0V
Switcher Max Duty Cycle
VSW = 5V with 50Ω load,
72
85
95
VFB1 = VFB2 = 1V
Current Sense Amp Gain
Error Amp DC Gain
ISW = 2.3A
7
67
dB
Error Amp Transconductance
2700
µA/V
ꢀ ENABLE Input
VIL
0.8
10
1.24
1.30
60
V
V
VIH
2.0
40
Hysteresis
Input Impedance
mV
kΩ
20
ꢀ Select Input
VIL (Selects VFB1
)
4.9 ≤ VLIN ≤ 5.1
4.9 ≤ VLIN ≤ 5.1
SELECT = 0V
0.8
1.25
1.25
24
V
V
VIH (Selects VFB2
)
2.0
50
SELECT Pull-Up
10
kΩ
V
Floating Input Voltage
Note 1: Guaranteed by Design, not 100% tested in production.
3.5
4.5
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
