Rainbow-electronics MAX1718 Manual do Utilizador Página 2
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MAX1718
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP
-
II)
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= SKP/SDN = 5V, V
OUT
= 1.25V, T
A
= 0°C to +85°C, unless otherwise noted.)
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.
V+ to GND ..............................................................-0.3V to +30V
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
D0–D4, ZMODE, VGATE, OVP, SUS, to GND .........-0.3V to +6V
SKP/SDN to GND ...................................................-0.3V to +16V
ILIM, CC, REF, POS, NEG, S1, S0,
TON, TIME to GND.................................-0.3V to (V
CC
+ 0.3V)
DL to GND..................................................-0.3V to (V
DD
+ 0.3V)
BST to GND ............................................................-0.3V to +36V
DH to LX .....................................................-0.3V to (BST + 0.3V)
LX to BST..................................................................-6V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation
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.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
228
4.5 5.5
Battery voltage, V+
V
CC
, V
DD
Input Voltage Range
DC Output Voltage Accuracy
V+ = 4.5V to 28V,
includes load
regulation error
DAC codes from 0.9V to 1.75V
DAC codes from 0.6V to 0.875V
-1 +1
-1.5 +1.5
%
%
Line Regulation Error V
CC
= 4.5V to 5.5V, V
BATT
= 4.5V to 28V
5
mV
Input Bias Current FB, POS, NEG
-0.2 +0.2
µA
V
0.4 2.5
POS, NEG Common-Mode Range
TIME Frequency Accuracy
150kHz nominal, R
TIME
= 120kΩ
380kHz nominal, R
TIME
= 47kΩ
38kHz nominal, R
TIME
= 470kΩ
V+ = 5V, FB = 1.2V, TON = GND (1000kHz)
-8 +8
-12 +12
-12 +12
230 260 290
%
ns
165 190 215
320 355 390
465 515 565
TON = REF (550kHz)
TON = open (300kHz)
TON = V
CC
(200kHz)
V+ = 12V, FB = 1.2V
On-Time (Note 1)
Minimum Off-Time (Note 1)
TON = V
CC
, open, or REF (200kHz, 300kHz, or 550kHz)
TON = GND (1000kHz)
400 500
300 375
ns
µA
700 1200
Measured at V
CC
, FB forced above the regulation pointQuiescent Supply Current (V
CC
)
Quiescent Supply Current (V
DD
) Measured at V
DD
, FB forced above the regulation point
<1 5
µA
µA
25 40
Quiescent Battery Supply
Current (V+)
Shutdown Supply Current (V
CC
)
Shutdown Supply Current (V
DD
)
SKP/SDN = GND
SKP/SDN = GND
25
<1 5
µA
µA
µA
<1 5
SKP/SDN = GND, V
CC
= V
DD
= 0V or 5V
Shutdown Battery Supply
Current (V+)
Reference Voltage V
CC
= 4.5V to 5.5V, no REF load
1.98 2 2.02
V
mV
-80 +80
POS - NEGPOS, NEG Differential Range
V/V
0.81 0.86 0.91
∆V
FB
/ (POS - NEG); POS - NEG = 50mVPOS, NEG Offset Gain
PWM CONTROLLER
BIAS AND REFERENCE
- Ordering Information 1
- Minimal Operating Circuit 1
- General Description 1
- Applications 1
- Features 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- MAX1718 toc07 7
- MAX1718 toc15 8
- MAX1718 toc16 8
- Pin Description 9
- Pin Description (continued) 10
- Detailed Description 12
- Forced-PWM Mode (SKP/ 14
- Integrator Amplifiers/Output 14
- Voltage Offsets 14
- Current-Limit Circuit 15
- MOSFET Gate Drivers (DH, DL) 16
- Shutdown 17
- DAC Inputs D0–D4 17
- Using the ZMODE Mux 19
- Table 5. DAC Mux Operation 21
- Output Overvoltage Protection 22
- Output Undervoltage Shutdown 23
- Design Procedure 24
- Inductor Selection 25
- Setting the Current Limit 25
- Output Capacitor Selection 25
- Output Capacitor Stability 26
- Considerations 26
- Input Capacitor Selection 26
- Power MOSFET Selection 26
- MOSFET Power Dissipation 26
- Applications Information 27
- High-Accuracy Current Limit 28
- Dropout Performance 30
- Adjusting V 30
- (5V Input) Applications 30
- Ceramic Output Capacitor 31
- PC Board Layout Guidelines 31
- Chip Information 32
- Pin Configuration 34
- Package Information 35
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