Rainbow-electronics MAX1813 Manual de usuario Pagina 2
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MAX1813
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: SKP/SDN may be forced to 12V, temporarily exceeding the absolute maximum rating, for the purpose of debugging proto-
type breadboards, using the no-fault test mode.
V+ to GND ..............................................................-0.3V to +30V
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
D0–D4, CODE, ZMODE, SUS, PGOOD to GND ......-0.3V to +6V
SKP/SDN to GND (Note 1) .....................................-0.3V to +16V
ILIM, FB, CC, REF,
TON, TIME, S0, S1 to GND......................-0.3V to (V
CC
+ 0.3V)
VPCS to GND ............................................................-2V to +30V
DL to PGND................................................-0.3V to (V
DD
+ 0.3V)
BST to PGND..........................................................-0.3V to +36V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
LX to BST..................................................................-6V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)..........860mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM CONTROLLER
Battery voltage, V+ 2 28
Input Voltage Range
V
CC
, V
DD
4.5 5.5
V
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.925V to 2.0V
-1 +1
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.700V to 0.900V
-1.5 +1.5
DC Output Voltage Accuracy
(Notes 2, 3)
V+ = 4.5V to 28V, VPCS = GND, DAC
codes from 0.600V to 0.675V
-1.83 +1.83
%
VPCS Input Bias Current I
VPS
V
VPCS
= 0 or 28V -1 +1 µA
VPCS Transconductance G
m
V
VPCS
= 0 to -100mV 18 20 22 µS
VPCS Linear Input Range ±100 mV
FB Input Resistance R
FB
115 180 265 kΩ
38kHz nominal, R
TIME
= 470kΩ -12 +12
150kHz nominal, R
TIME
= 120kΩ -8 +8
TIME Frequency Accuracy
380kHz nominal, R
TIME
= 47kΩ -12 +12
%
ILIM Input Leakage Current I
ILIM
V
ILIM
= 0 or 5.0V 0.01 100 nA
V+ = 5.0V, V
FB
= 1.2V TON = GND 250 270 290
TON = REF 165 190 215
TON = open 320 355 390
On-Time (Note 4) t
ON
V+ = 12V, V
FB
= 1.2V
TON = V
CC
465 515 563
ns
TON = REF, open, or V
CC
400 500
Minimum Off-Time (Note 4) t
OFF
(
MIN
)
TON = GND 300 375
ns
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)I
CC
Measured at V
CC
, FB forced above the
regulation point
1.4 2.5 mA
- 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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