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PDF MAX1718 Data sheet ( Hoja de datos )
| Número de pieza | MAX1718 | |
| Descripción | Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1960; Rev 3; 8/02
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
General Description
The MAX1718 step-down controller is intended for core
CPU DC-DC converters in notebook computers. It fea-
tures a dynamically adjustable output, ultra-fast transient
response, high DC accuracy, and high efficiency need-
ed for leading-edge CPU core power supplies. Maxim’s
proprietary Quick-PWM™ quick-response, constant-on-
time PWM control scheme handles wide input/output
voltage ratios with ease and provides 100ns “instant-on”
response to load transients while maintaining a relatively
constant switching frequency.
The output voltage can be dynamically adjusted through
the 5-bit digital-to-analog converter (DAC) over a 0.6V to
1.75V range. The MAX1718 has an internal multiplexer
that accepts three unique 5-bit VID DAC codes corre-
sponding to Performance, Battery, and Suspend modes.
Precision slew-rate control† provides “just-in-time” arrival
at the new DAC setting, minimizing surge currents to
and from the battery.
The internal DAC of the MAX1718B is synchronized to
the slew-rate clock for improved operation under
aggressive power management of newer chipsets and
operating systems that can make incomplete mode tran-
sitions.
A pair of complementary offset control inputs allows
easy compensation for IR drops in PC board traces or
creation of a voltage-positioned power supply. Voltage-
positioning modifies the load-transient response to
reduce output capacitor requirements and total system
power dissipation.
Single-stage buck conversion allows these devices to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the 5V system supply instead of the bat-
tery) at a higher switching frequency allows the mini-
mum possible physical size.
The MAX1718 is available in a 28-pin QSOP package.
Applications
IMVP-II™ Notebook Computers
2-Cell to 4-Cell Li+ Battery to CPU Core Supply
Converters
5V to CPU Core Supply Converters
Pin Configuration appears at end of data sheet.
Features
o Quick-PWM Architecture
o ±1% VOUT Accuracy Over Line and Load
o 5-Bit On-Board DAC with Input Muxes
o Precision-Adjustable VOUT Slew Control
o 0.6V to 1.75V Output Adjust Range
o Precision Offset Control
o Supports Voltage-Positioned Applications
o 2V to 28V Battery Input Range
o Requires a Separate 5V Bias Supply
o 200/300/550/1000kHz Switching Frequency
o Over/Undervoltage Protection
o Drives Large Synchronous-Rectifier FETs
o 700µA (typ) ICC Supply Current
o 2µA (typ) Shutdown Supply Current
o 2V ±1% Reference Output
o VGATE Blanking During Transition
o Small 28-Pin QSOP Package
Ordering Information
PART
MAX1718EEI
MAX1718BEEI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
Minimal Operating Circuit
SHUTDOWN
DUAL MODE VID
MUX INPUTS
MUX CONTROL
SUSPEND
INPUT
DECODER
5V INPUT
VCC
SKP/SDN
ILIM
VDD
V+
BST
MAX1718 DH
D0
D1 LX
D2
D3 DL
D4
ZMODE
SUS
GND
S0
S1 FB
TIME NEG
CC POS
BATT 2V TO 28V
OUTPUT
0.6V TO 1.75V
VCC
†Patent pending.
Quick-PWM is a trademark of Maxim Integrated Products.
IMVP-II is a trademark of Intel Corp.
REF
VGATE
TON OVP
POWER-GOOD
OUTPUT
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = SKP/SDN = 5V, VOUT = 1.25V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Off-Time (Note 1)
TON = VCC, open, or REF (200kHz, 300kHz, or 550kHz)
TON = GND (1000kHz)
500
ns
375
BIAS AND REFERENCE
Quiescent Supply Current (VCC) Measured at VCC, FB forced above the regulation point
Quiescent Supply Current (VDD) Measured at VDD, FB forced above the regulation point
1300
5
µA
µA
Quiescent Battery Supply
Current (V+)
40 µA
Shutdown Supply Current (VCC) SKP/SDN = 0
Shutdown Supply Current (VDD) SKP/SDN = 0
5 µA
5 µA
Shutdown Battery Supply
Current (V+)
SKP/SDN = 0, VCC = VDD = 0 or 5V
5 µA
Reference Voltage
FAULT PROTECTION
Overvoltage Trip Threshold
VCC = 4.5V to 5.5V, no REF load
Measured at FB
1.98 2.02 V
1.95 2.05 V
Output Undervoltage Protection
Threshold
With respect to unloaded output voltage
65 75 %
Current-Limit Threshold Voltage
(Positive, Default)
GND - LX, ILIM = VCC
80 115 mV
Current-Limit Threshold Voltage
(Positive, Adjustable)
Current-Limit Threshold Voltage
(Negative)
GND - LX
LX - GND, ILIM = VCC
ILIM = 0.5V
ILIM = REF (2V)
33
160
-145
65
mV
240
-90 mV
VCC Undervoltage Lockout
Threshold
VGATE Lower Trip Threshold
VGATE Upper Trip Threshold
GATE DRIVERS
DH Gate Driver On-Resistance
DL Gate Driver On-Resistance
Rising edge, hysteresis = 20mV, PWM disabled below this
level
Measured at FB with respect to unloaded output voltage
Measured at FB with respect to unloaded output voltage
4.1
-12.5
+7.5
BST - LX forced to 5V
DL, high state (pullup)
DL, low state (pulldown)
4.4
-7.5
+12.5
V
%
%
3.5 Ω
3.5
Ω
1.0
_______________________________________________________________________________________ 5
5 Page 
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
SHUTDOWN
VCC
MUX CONTROL
SUSPEND
INPUT
DECODER
C7
1µF
R2
100kΩ
R3
100kΩ
REF
R4
62kΩ
C6
47pF
C5
0.22µF
R18
24.9kΩ
R19
27.4kΩ
R1 5V INPUT
20Ω
9
VCC
2 SKP/SDN
17
VDD
V+
1
10
TON
26
BST
25
D0
24
D1
23
D2
28
DH
LX 27
22 D3
MAX1718
16
DL
21 D4
15
GND
19 ZMODE
18 SUS
FB 4
C1
1µF BATT 7V TO 24V
D1
CMPSH-3
2x
IRF7811A
Q1 L1
0.68µH
C3
0.1µF
SUMIDA
CEP125#4712-TO11
C2, 25V, X5R
5 x 10µF
R8
0.004Ω
2x
FDS7764A
Q2
D2
CENTRAL
SEMICONDUCTOR
CMSH5-40
OUTPUT
0.6V TO 1.75V
C4
6 x 270µF, 2V
PANASONIC SP
EEFUE0D271R
7 S0
8 S1
NEG 5
3 TIME
6 CC
11 REF
12
ILIM
POS 13
R6
511kΩ
VGATE 14
20
OVP
R7
4.75kΩ
5V
R5
100kΩ
POWER-GOOD
OUTPUT
Figure 1. Standard Application Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1718.PDF ] | |
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