Rainbow-electronics MAX1813 Manual de usuario Pagina 4
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MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, V
CC
= V
DD
= 5V, VPCS = ZMODE = GND = PGND, SKP/SDN = CODE = V
CC
, V
OUT
set to 1.5V,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVERS
DH Gate Driver On-Resistance R
ON
(
D H
)
V
BST
- V
LX
forced to 5V 1.2 3.5 Ω
High state (pull up) 1.3 3.5
DL Gate Driver On-Resistance R
ON
(
DL
)
Low state (pull down) 0.4 1.0
Ω
DH Gate Driver Source/Sink
Current
I
DH
DH forced to 2.5V, V
BST
- V
LX
forced to 5V 2.0 A
DL Gate Driver Sink Current I
DL
DL forced to 5V 4.0 A
DL Gate Driver Source Current I
DL
DL forced to 2.5V 1.3 A
DL rising 35
Dead Time
DH rising 26
ns
LOGIC AND I/O
Logic Input High Voltage V
IH
D0−D4, CODE, SUS, ZMODE; V
CC
= 4.5V
to 5.5V
2.4 V
Logic Input Low Voltage V
IL
D0−D4, CODE, SUS, ZMODE; V
CC
= 4.5V
to 5.5V
0.8 V
DAC Z-Mode Programming
Resistor, Low
D0−D4, 0 to 0.4V or 2.6V to 5.5V applied to
the resistor, ZMODE = CODE = GND or
ZMODE = CODE = V
CC
1.05 kΩ
DAC Z-Mode Programming
Resistor, High
D0−D4, 0 to 0.4V or 2.6V to 5.5V applied to
the resistor, ZMODE = CODE = GND or
ZMODE = CODE = V
CC
95 kΩ
Pull up 40
D0−D4, CODE Pull Up/Down
Entering impedance
mode
Pull down 8
kΩ
D0−D4, CODE = V
CC
-1 +1
Logic Input Current
SUS, ZMODE = GND or V
CC
-1 +1
µA
4-Level Logic Input High (V
CC
) TON (200kHz operation), S0, S1
V
CC
-
0.4
V
4-Level Logic Input Upper-
Middle (Float)
TON (300kHz operation), S0, S1 2.8 3.85 V
4-Level Logic Input Lower-
Middle (REF)
TON (600kHz operation), S0, S1 1.65 2.35 V
4-Level Logic Low (GND) TON (1000kHz operation), S0, S1 0.5 V
SKP/SDN High Input Level
(Skip Mode)
2.8 6.0 V
SKP/SDN Float Input Level
(Forced-PWM Mode)
1.4 2.2 V
SKP/SDN Low Input Level
(Shutdown Mode)
0.5 V
- General Description 1
- Applications 1
- Features 1
- Ordering Information 1
- Pin Configuration 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- MAX1813 toc21 11
- MAX1813 toc22 11
- MAX1813 toc23 11
- MAX1813 toc24 11
- Pin Description 12
- Pin Description (continued) 13
- Detailed Description 14
- Standard Applications 15
- Table 2. Component Suppliers 15
- Figure 2. Functional Diagram 16
- Forced-PWM Mode 18
- Current-Limit Circuit (ILIM) 19
- DAC Converter (D0-D4) 20
- VID Code Options (CODE) 20
- Table 7. ZMODE Polarity Table 22
- Power-Good Output (PGOOD) 23
- Design Procedure 24
- Inductor Selection 25
- Setting the Current Limit 25
- Output Capacitor Selection 25
- Input Capacitor Selection 26
- Power MOSFET Selection 26
- MOSFET Power Dissipation 26
- Setting Voltage Positioning 27
- Applications Information 28
- Dropout Performance 29
- Using the ZMODE Multiplexer 30
- Adjusting V 32
- Offsetting the Output Voltage 32
- Above 2V 32
- Figure 16. Adjusting V 34
- (5V Input) Applications 35
- PC Board Layout Guidelines 36
- Typical Operating Circuit 37
- Chip Information 37
- Package Information 38
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