MAX6841IUKD4+T Maxim Integrated, MAX6841IUKD4+T Datasheet

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MAX6841IUKD4+T

Manufacturer Part Number
MAX6841IUKD4+T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6841, MAX6842, MAX6843, MAX6844, MAX6845r
Datasheet

Specifications of MAX6841IUKD4+T

Number Of Voltages Monitored
1
Monitored Voltage
0.9 V to 1.5 V
Undervoltage Threshold
1.35 V
Overvoltage Threshold
1.425 V
Output Type
Active High, Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
2240 ms
Supply Voltage - Max
1.8 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Chip Enable Signals
No
Maximum Power Dissipation
571 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
8.1 uA
Supply Voltage - Min
0.75 V
The MAX1937/MAX1938/MAX1939 comprise a family of
synchronous, two-phase, step-down controllers capable
of delivering load currents up to 60A. The controllers uti-
lize Quick-PWM™ control architecture in conjunction with
active load-current voltage positioning. Quick-PWM con-
trol provides instantaneous load-step response, while
programmable voltage positioning allows the converter
to utilize full transient regulation limits, reducing the out-
put capacitance requirement. The two phases operate
180° out-of-phase with an effective 500kHz switching fre-
quency, thus reducing input and output current ripple, as
well as reducing input filter capacitor requirements.
The MAX1937/MAX1938/MAX1939 are compliant with
AMD Hammer, Intel ® ‚ Voltage-Regulator Module (VRM)
9.0/9.1, and AMD Athlon™ Mobile VID code specifica-
tions (see Table 1 for VID codes). The internal DAC pro-
vides ultra-high accuracy of ±0.75%. A controlled VID
voltage transition is implemented to minimize both
undervoltage and overvoltage overshoot during VID
input change.
Remote sensing is available for high output-voltage
accuracy. The MOSFET switches are driven by a 6V
gate-drive circuit to minimize switching and crossover
conduction losses to achieve efficiency as high as
90%. The MAX1937/MAX1938/MAX1939 feature cycle-
by-cycle current limit to ensure that the current limit is
not exceeded. Crowbar protection is available to pro-
tect against output overvoltage.
19-2498; Rev 1; 10/02
Typical Application Circuits and Functional Diagram appear
at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Athlon is a trademark of Advanced Micro Devices, Inc.
Intel is a registered trademark of Intel Corp.
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.
Notebook and Desktop Computers
Servers and Workstations
Blade Servers
High-End Switches
High-End Routers
Macro Base Stations
________________________________________________________________ Maxim Integrated Products
Controllers with Controlled VID Change
General Description
Two-Phase Desktop CPU Core Supply
Applications
♦ ±0.75% Output Voltage Accuracy
♦ Instant Load-Transient Response
♦ Up to 90% Efficiency Eliminates Heatsinks
♦ Up to 60A Output Current
♦ 8V to 24V Input Range
♦ User-Programmable Voltage Positioning
♦ Controlled VID Voltage Transition
♦ 500kHz Effective Switching Frequency
♦ MAX1937: AMD Hammer Compatible
♦ MAX1938: Intel VRM 9.0/9.1 Compatible
♦ MAX1939: AMD Athlon Mobile Compatible
♦ Soft-Start
♦ Power-Good (PWRGD) Output
♦ Cycle-by-Cycle Current Limit
♦ Output Overvoltage Protection (OVP)
♦ R
♦ Remote Voltage Sensing
♦ 28-Pin QSOP Package
MAX1937EEI
MAX1938EEI
MAX1939EEI
DS(ON)
PART
TOP VIEW
or R
SENSE
GNDS
VPOS
TIME
VID0
VID1
VID2
VID3
VID4
ILIM
GND
V
REF
DD
EN
FB
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Ordering Information
Current Sensing
MAX1937
MAX1938
MAX1939
QSOP
Pin Configuration
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
BST1
DH1
LX1
CS1
DL1
VLG
PGND
DL2
CS2
LX2
DH2
BST2
PWRGD
CC
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
Features
1

Related parts for MAX6841IUKD4+T

MAX6841IUKD4+T Summary of contents

Page 1

... High-End Routers Macro Base Stations Typical Application Circuits and Functional Diagram appear at end of data sheet. Quick-PWM is a trademark of Maxim Integrated Products, Inc. Athlon is a trademark of Advanced Micro Devices, Inc. Intel is a registered trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’ ...

Page 2

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ABSOLUTE MAXIMUM RATINGS V to GND ............................................................-0.3V to +28V PWRGD, ILIM GND ...............................-0.3V to +6V DD EN, GNDS, VPOS, REF, VID_, TIME to GND ............................................0.3V ...

Page 3

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ELECTRICAL CHARACTERISTICS (continued 12V 5V, PGND = GNDS = GND = 0, VID_ = GND VDD +85°C, unless otherwise noted. Typical ...

Page 4

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ELECTRICAL CHARACTERISTICS (continued 12V 5V, PGND = GNDS = GND = 0, VID_ = GND VDD +85°C, unless otherwise noted. Typical ...

Page 5

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ELECTRICAL CHARACTERISTICS (V = 12V 5V, PGND = GNDS = GND, VID_= GND, C VCC EN VDD unless otherwise noted.) (Note 1) PARAMETER GENERAL MAX1937 V ...

Page 6

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ELECTRICAL CHARACTERISTICS (continued 12V 5V, PGND = GNDS = GND, VID_= GND, C VCC EN VDD unless otherwise noted.) (Note 1) PARAMETER CS Input ...

Page 7

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change (V = 12V 1.45V +25°C, unless otherwise noted.) IN OUT A EFFICIENCY vs. LOAD CURRENT AT 1.45V OUTPUT ...

Page 8

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change (V = 12V 1.45V +25°C, unless otherwise noted.) IN OUT A V CURRENT vs SHUTDOWN ...

Page 9

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change (V = 12V 1.45V +25°C, unless otherwise noted.) IN OUT A LOAD TRANSIENT 1A TO 40A TO 1A MAX1937 toc14 40μs/div SOFT-START WAVEFORMS WITH 40A LOAD ...

Page 10

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change (V = 12V 1.45V +25°C, unless otherwise noted.) IN OUT A VID CODE CHANGE ON-THE-FLY WITH 40A LOAD 1.2V TO 1.45V TO 1.2V 40μs/div REFERENCE VOLTAGE ...

Page 11

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change PIN NAME 1 VID0 Voltage Identification Input Bit 0. See Table 1. Internal 100kΩ pullup resistor VID1 Voltage Identification Input Bit 1. See Table 1. Internal 100kΩ ...

Page 12

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change PIN NAME DL_ Driver Power-Supply Input. Connect to a 4.5V to 6.5V supply for powering the low-side MOSFET 22 VLG gate drive, and the bootstrap circuit for driving the high-side ...

Page 13

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change Table 1. VID Programmed Output Voltage VID4 VID3 VID2 VID1 ...

Page 14

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change EMF causes high earlier than normal, extend- ing the on-time by a period equal to the DH rising dead-time. When the controller operates in continuous mode, the ...

Page 15

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change U2 R1 KA78M06 D1 10Ω OUT CENTRAL GND CMHD4448 2.2μ VDD 2.2μF 2.2μF 0.01μF VID0 VID1 VID2 VID3 VID4 EN ...

Page 16

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change MOSFET Drivers The DH_ and DL_ drivers are optimized for driving large high-side (N1 and N2) and larger low-side MOSFETs (N3 and N4). This is consistent with the low duty-cycle ...

Page 17

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change TIME Figure 2. Inductor Current Waveform The maximum allowable voltage change during a tran- sient is fixed by the supply range of the CPU ( This means that ...

Page 18

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change CAPACITIVE SOAR (dV/ ESR VOLTAGE STEP ( STEP ESR V OUT CAPACITIVE SAG (dV/ RECOVERY OUT OUT I LOAD Figure 4. ...

Page 19

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change ( longer a problem. The amount of overshoot SAG from stored inductor energy can be calculated as: 2 × I PEAK = V SOAR × × 2 ...

Page 20

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change V is set from 0. connecting ILIM to a ILIM resistor-divider from REF to GND. Select resistors R3 and R4 such that the current through the divider ...

Page 21

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change where f is approximately 250kHz charge of the high-side MOSFET, and Q charge of the low-side MOSFET. The values used for the gate charge are at the gate ...

Page 22

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change EN ENABLE/ SHUTDOWN PWRGD g m VPOS REF 2V FB ∑ ∑ GNDS GND 22 ______________________________________________________________________________________ VDD VCC ON-TIME BIAS CS1 ONE-SHOT ON-TIME CS2 COMPUTE FB REF - 12.5% REF ...

Page 23

Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change VDD U2 R1 KA78M06 D1 10Ω OUT CENTRAL GND CMHD4448 2.2μ VDD 2.2μF 2.2μF 0.01μF VID0 VID1 VID2 VID3 VID4 ...

Page 24

... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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