Electrical characteristics (continued), Electrical characteristics – Rainbow Electronics MAX1775 User Manual
Page 4
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC INPUTS
SHDNM, SHDNC Input Low
Voltage
0.4
V
SHDNM, SHDNC Input High
Voltage
2.0
V
SHDNM, SHDNC Input Low
Current
SHDNM = SHDNC = GND
-1
1
µA
SHDNC Input High Current
V
SHDNC
= +5.5V
5
µA
V
SHDNM
= +5V
2
SHDNM Input High Current
V
SHDNM
= +28V
15
30
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V, V
MAIN
= V
INC
= V
CS-
= V
CS+
= +3.3V, V
CORE
= +1.8V, Circuit of Figure 4, T
A
= 0°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V, V
MAIN
= V
INC
= V
CS-
= V
CS+
= +3.3V, V
CORE
= +1.8V, Circuit of Figure 4, T
A
-40°C to +85°C, unless otherwise noted.)
(Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
Input Voltage
V
IN
2.7
28
V
Input Quiescent Supply Current
I
IN
V
FBM
= +1.5V, V
FBC
= +1.5V,
V
SHDNM
= V
SHDNC
= +3.3V
30
µA
CS- Quiescent Supply Current
I
CS-
V
FBM
= +1.5V, V
FBC
= +1.5V,
V
SHDNM
= V
SHDNC
= +3.3V
220
µA
Core Regulator Quiescent
Supply Current
I
INC
V
FBM
= +1.5V, V
FBC
= +1.5V,
V
SHDNM
= V
SHDNC
= +3.3V
120
µA
IN Shutdown Supply Current
SHDNM = SHDNC = GND
30
µA
MAIN REGULATOR
Main Output Voltage Adjust
Range
1.25
5.5
V
FBM Regulation Threshold
V
FBM
V
( C S + - C S - )
= 0 to + 60m V , V
I N
= + 2.7V to + 28V 1.21
1.29
V
FBM Input Current
I
FBM
V
FBM
= +1.3V
-0.1
0.1
µA
Current-Limit Threshold
V
CL
V
CS+
- V
CS-
60
100
mV
M i ni m um C ur r ent- Li m i t Thr eshol d V
CS+
- V
CS-
6
24
mV
Valley Current Threshold
V
CS+
- V
CS-
40
60
mV
Zero Current Threshold
V
CS+
- V
CS-
0
15
mV
PDRV, NDRV Gate Drive
Resistance
V
CS-
= +3.3V
4.4
Ω
CS- to CVL Switch Resistance
I
CVL
= 50mA
8
Ω