MAX1907AETL Maxim Integrated Products, MAX1907AETL Datasheet

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MAX1907AETL

Manufacturer Part Number
MAX1907AETL
Description
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1907AETL

Case
QFN
Dc
04+

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The MAX1907A/MAX1981A are single-phase, Quick-
PWM™ master controllers for IMVP-IV™ CPU core sup-
plies. Multi-phase operation is achieved using a
Quick-PWM slave controller (MAX1980). Multiphase
operation reduces input ripple current requirements
and output voltage ripple while easing component
selection and layout difficulties. The MAX1907A/
MAX1981A include active voltage positioning with
adjustable gain and offset, reducing power dissipation
and bulk output capacitance requirements.
The MAX1907A/MAX1981A are intended for two differ-
ent notebook CPU core applications: either bucking
down the battery directly, or 5V system supply to create
the core voltage. The single-stage conversion method
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 battery) at higher
switching frequency provides the minimum possible
physical size.
The MAX1907A/MAX1981A meet the IMVP-IV specifica-
tions and include logic to interface with the CPU power
good signals from the V
system. The regulator features power-up sequencing,
automatically ramping up to the Intel-specified boot volt-
age. The MAX1907A/MAX1981A feature independent
four-level logic inputs for setting the boot voltage
(B0–B2) and the suspend voltage (S0–S2).
The MAX1907A/MAX1981A include output undervoltage
protection, thermal protection, and system power-OK
(SYSPOK) input/output. When any of these protection fea-
tures detect a fault, the MAX1907A/MAX1981A immedi-
ately shut down. Additionally, the MAX1907A includes
overvoltage protection.
The MAX1907A/MAX1981A are available in a thin 40-pin
QFN package.
19-2678; Rev 0; 9/02
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
IMVP-IV is a 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.
Positioned CPU Core Power Supplies (IMVP-IV)
IMVP-IV™ Notebook Computers
Single-Phase CPU Core Supply
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Quick-PWM Master Controllers for Voltage-
________________________________________________________________ Maxim Integrated Products
CCP
General Description
and V
CCMCH
Applications
rails within the
♦ Quick-PWM Master Controllers
♦ Multiphase Conversion with Slave Controller
♦ Active Voltage Positioning with Adjustable Gain
♦ Adjustable Slew Rate Control
♦ ±0.75% V
♦ 6-Bit On-Board DAC (16mV Increments)
♦ 0.700V to 1.708V Output Adjust Range
♦ Selectable 200kHz/300kHz/550kHz/1000kHz
♦ 2V to 28V Battery Input Voltage Range
♦ Drive Large Synchronous Rectifier MOSFETs
♦ Output Overvoltage Protection (MAX1907A Only)
♦ Undervoltage and Thermal Fault Protection
♦ Power Sequencing and Selectable Boot Voltage
♦ Low-Profile 40-Pin Thin QFN, 6mm
MAX1907AETL -40°C to +100°C
MAX1981AETL -40°C to +100°C
(MAX1980)
and Offset
Temperature
Switching Frequency
Package
PART
TOP VIEW
SHDN
ILIM
V
REF
B0
B1
B2
S0
S1
S2
CC
OUT
1
2
3
4
5
6
7
8
9
10
40
11
TEMP RANGE
Accuracy Over Line, Load, and
39
12
40-Pin, 6mm x 6mm Thin QFN
38
13
Ordering Information
14
37
36
15
MAX1907A
MAX1981A
Pin Configuration
16
35
34
17
PIN-PACKAGE
40- QFN Thi n 6m m x 6m m
40- QFN Thi n 6m m x 6m m
18
33
19
32
20
✕ ✕
31
Features
6mm
30
29
28
27
26
25
24
23
22
21
V
DL
PGND
DDO
D0
D1
D2
D3
D4
D5
DD
1

Related parts for MAX1907AETL

MAX1907AETL Summary of contents

Page 1

... Output Overvoltage Protection (MAX1907A Only) ♦ Undervoltage and Thermal Fault Protection ♦ Power Sequencing and Selectable Boot Voltage ♦ Low-Profile 40-Pin Thin QFN, 6mm rails within the Package PART MAX1907AETL -40°C to +100°C MAX1981AETL -40°C to +100°C TOP VIEW ...

Page 2

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +30V GND .....................................................-0. SYSPOK, IMVPOK, CLKEN to GND .........................-0.3V to +6V DPSLP, SUS, ...

Page 3

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V 1.26V, ILIM = V , SUS = D5 = D1= D0 ...

Page 4

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V 1.26V, ILIM = V , SUS = D5 = D1= D0 ...

Page 5

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V 1.26V, ILIM = V , SUS = D5 = D1= D0 ...

Page 6

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ELECTRICAL CHARACTERISTICS (Circuit of Figure 15V 1.26V, ILIM = V , SUS = ...

Page 7

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V 1.26V, ILIM = V , SUS = ...

Page 8

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V 1.26V, ILIM = V , SUS = ...

Page 9

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) (Circuit of Figure 12V VOLTAGE-POSITIONED OUTPUT vs. LOAD CURRENT (V = 1.436V) OUT 1.46 1.44 1.42 1.40 1.38 1.36 1.34 1.32 ...

Page 10

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) (Circuit of Figure 12V FREQUENCY vs. TEMPERATURE 350 330 20A LOAD 310 290 NO LOAD 270 SINGLE PHASE V = 1.436V ...

Page 11

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) (Circuit of Figure 12V VPS AMPLIFIER OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE 180 160 140 120 100 VPS AMPLIFIER ...

Page 12

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) (Circuit of Figure 12V SOFT SHUTDOWN MAX1907A/81A toc25 40μs/div 5V, 5V/div SHDN ...

Page 13

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) (Circuit of Figure 12V LOAD TRANSIENT (HIGHEST FREQUENCY) 30A 0 1.436V OUT B. V OUT C. I ...

Page 14

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) PIN NAME Boot-Mode Voltage Select Inputs. B0–B2 are four-level digital inputs that select the boot-mode VID code (Table 6) for the boot-mode multiplexer inputs. During power-up, the boot-mode VID ...

Page 15

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) PIN NAME 19 CSN Negative Current-Limit Input. Connect to the negative terminal of the current-sense resistor. Deep-Sleep Control Input. When DPSLP is low the system enters the deep-sleep state ...

Page 16

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) PIN NAME Open-Drain Power Good Output. After output voltage transitions, except during power-up and power-down, if OUT is in regulation then IMVPOK is high impedance. IMVPOK is pulled high ...

Page 17

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) R14 R13 R12 R11 100kΩ 100kΩ 100kΩ 10Ω C2 1μF DAC INPUTS (1V LOGIC) SUSPEND INPUTS (4-LEVEL LOGIC) BOOT INPUTS (4-LEVEL LOGIC) MODE CONTROL ON OFF FLOAT (300kHz) C ...

Page 18

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) R15 10Ω C7 0.22μF FLOAT (300kHz) D3 OUTPUT C R COMP COMP 270pF 20kΩ REF (MASTER) R16 200kΩ 100pF R17 49.9kΩ 1% DDO (MASTER) CONNECT TO ILIM ...

Page 19

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Table 2. Component Suppliers SUPPLIER BI Technologies Central Semiconductor Coilcraft Coiltronics Fairchild Semiconductor International Rectifier Kemet Panasonic Sanyo Siliconix (Vishay) Sumida Taiyo Yuden TDK Toko Detailed Description 5V Bias ...

Page 20

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) V+ TON CSP CSN ILIM 0.9 x REF CLKEN POWER-GOOD LOGIC IMVPOK Figure 2. MAX1907A/MAX1981A Functional Diagram 20 ______________________________________________________________________________________ ON-TIME COMPUTE MAX1907A MAX1981A ONE-SHOT Q TRIG ...

Page 21

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) expected drop across the low-side MOSFET switch. This algorithm results in a nearly constant switching fre- quency despite the lack of a fixed-frequency clock gen- erator. The benefits of ...

Page 22

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Forced-PWM operation comes at a cost: the no-load 5V bias supply current remains between 10mA to 40mA, depending on the external MOSFETs and switching fre- quency. To maintain high ...

Page 23

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Δ BATT OUT = Δ ON-TIME TIME LIMIT(VALLEY) LOAD(MAX) 0 TIME Figure 4. "Valley" Current-Limit Threshold Point ciency vs. load curve, ...

Page 24

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) pling between LX and DL created by the MOSFETs’ gate-to-drain capacitance (C RSS ( and additional board parasitics should not ISS RSS exceed the following minimum threshold ...

Page 25

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) This results in large negative inductor current and possi- bly small negative output voltages this fashion, the output can be clamped with a Schottky diode to ...

Page 26

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Table 4. Operating Mode Truth Table SHDN DPSLP SYSPOK SUS ...

Page 27

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Table 5. Output Voltage VID DAC Codes (SUS = Low ...

Page 28

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Table 6. Suspend Mode DAC Codes (SUS = High GND GND GND GND GND REF GND GND OPEN GND GND V CC GND REF GND GND ...

Page 29

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Table 7. Boot-Mode DAC Codes (Power-Up GND GND GND GND GND REF GND GND OPEN GND GND V CC GND REF GND GND REF REF GND ...

Page 30

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV S0–S2 DECODER OUT S2 SUS B0–B2 DECODER OUT B2 SYSPOK Figure 7. Internal Multiplexers Functional Diagram 30 ...

Page 31

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Internal Multiplexers The MAX1907A/MAX1981A has two unique internal DAC input multiplexers (muxes) that can select one of three different DAC code settings for different proces- sor states. On startup, ...

Page 32

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Output Undervoltage Shutdown The output undervoltage protection (UVP) function is similar to foldback current limiting, but employs a timer rather than a variable current limit. If the MAX1907A/MAX1981A output ...

Page 33

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) Inductor Selection The switching frequency and operating point (% ripple or LIR) determine the inductor value as follows: ( − OUT IN OUT ...

Page 34

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) In non-CPU applications, the output capacitor’s size often depends on how much ESR is needed to maintain an acceptable level of output ripple voltage. The output ripple voltage of ...

Page 35

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) The easiest method for checking stability is to apply a very fast zero-to-max load transient and carefully observe the output-voltage-ripple envelope for over- shoot and ringing. It can help ...

Page 36

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) where C is the reverse transfer capacitance of N RSS and I is the peak gate-drive source/sink current GATE (1A, typ). Switching losses in the high-side MOSFET can become ...

Page 37

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) The voltage-positioned circuit determines the load current from the voltage across the current-sense resistors ( connected between the inductors SENSE CM CS and output ...

Page 38

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) CAPACITIVE SOAR (dV/ ESR VOLTAGE STEP ( STEP ESR V OUT CAPACITIVE SAG (dV/ RECOVERY OUT OUT I LOAD Figure ...

Page 39

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) PC Board Layout Guidelines Careful PC board layout is critical to achieve low switching losses and clean, stable operation. The switching power stage requires particular attention (Figure 11). If ...

Page 40

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) the master to the analog ground in the slave to pre- vent ground offsets. A low value (≤10Ω) resistor is sufficient to link the two grounds. 4) Keep the ...

Page 41

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) MAX1907A MAX1981A (MASTER) CURRENT ACTIVE VOLTAGE POSITIONING CURRENT BALANCE AND CURRENT LIMIT (SLAVE) MAX1980 ______________________________________________________________________________________ 5V BIAS SUPPLY LIMIT TRIGGER Typical Operating Circuit INPUT OUTPUT IMVP-IV CPU 5V BIAS ...

Page 42

Quick-PWM Master Controllers for Voltage- Positioned CPU Core Power Supplies (IMVP-IV) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 42 ______________________________________________________________________________________ Package Information ...

Page 43

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 43 © 2002 Maxim Integrated Products ...

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