MAX1639 Maxim, MAX1639 Datasheet - Page 3

• Manufacturer Part Number: MAX1639
• Description: High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
ELECTRICAL CHARACTERISTICS
(V
Note 1: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
FREQ Input Current
CSH, CSL Input Current
FB Input Current
CC1 Output Resistance
CC2 Transconductance
CC2 Clamp Voltage
CC2 Source/Sink Current
DH On-Resistance
DL On-Resistance
DH, DL Source/Sink Current
DH, DL Dead Time
Current-Limit Trip Voltage
Soft-Start Time
BST Leakage Current
DD
Input Voltage Range
Input Undervoltage Range
V
V
Reference Voltage
FB Voltage
PWROK Trip Level
Switching Frequency
Maximum Duty Cycle
DH On-Resistance
DL On-Resistance
Current-Limit Trip Voltage
DD
DD
DD
= V
= V
Supply Current
Supply Current
CC
CC
PARAMETER
PARAMETER
= +5V, PGND = AGND = 0V, FREQ = REF, T
= +5V, PGND = AGND = 0V, FREQ = REF, T
Synchronous Rectification for CPU Power
_______________________________________________________________________________________
High-Speed Step-Down Controller with
CSH = CSL = 1.1V
Minimum
Maximum
30mV overdrive
BST - LX = 4.5V
V
DH = DL = 2.5V
FB = 1.1V
FB = 0V (foldback)
To full current limit
BST = 12V, LX = 7V, REF = GND
V
V
V
5.5V
V
regulation point, operating or shutdown mode
No load
Includes line and load regulation errors
Rising FB, 1% hysteresis with respect to V
Falling FB, 1% hysteresis with respect to V
FREQ = V
FREQ = REF
FREQ = AGND
FREQ = V
BST - LX = 4.5V
V
FB = 1.1V
DD
CC
CC
CC
CC
DD
= 4.5V
= V
rising edge, 1% hysteresis
= V
= V
= 4.5V
DD
DD
DD
CC
CC
=
= 5.5V, FB forced 60mV above
Operating mode
Shutdown mode
A
A
CONDITIONS
CONDITIONS
= 0°C to +85°C, unless otherwise noted.)
= -40°C to +85°C, unless otherwise noted.) (Note 1)
FB overdrive = 60mV
VREF = 0V
REF
REF
3.448
1.072
MIN
2.4
MIN
85
15
800
510
240
4.5
3.9
4
0
84
70
-8
6
1536
TYP
100
100
TYP
0.7
0.7
10
30
38
1
2
MAX
±0.1
3.553
1.128
V
115
MAX
1200
3.0
50
70
50
690
360
130
5.5
4.3
0.2
4
CC
2
2
12
10
-4
3
2
2
1 / f
UNITS
mmho
UNITS
mV
kHz
µA
µA
µA
kΩ
µA
µA
ns
mA
mA
mV
Ω
Ω
A
V
%
%
Ω
Ω
V
V
V
V
OSC
3