MAX1544ETL+ Maxim Integrated Products, MAX1544ETL+ Datasheet - Page 17

• Manufacturer Part Number: MAX1544ETL+
• Description: IC QUICK-PWM DUAL-PHASE 40-TQFN
• Manufacturer: Maxim Integrated Products
• Series: Quick-PWM™r

Specifications of MAX1544ETL+

• Applications: Controller, AMD Hammer
• Voltage - Input: 2 ~ 28 V
• Number Of Outputs: 1
• Voltage - Output: 0.68 ~ 1.55 V
• Operating Temperature: -40°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Output Voltage: 0.675 V to 1.55 V
• Output Current: 40 A
• Input Voltage: 4 V to 28 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 100 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

After the phase-overlap mode ends, the controller auto-
matically begins with the opposite phase. For example,
if the secondary phase provided the last on-time pulse
before overlap operation began, the controller starts
switching with the main phase when overlap operation
ends.
The MAX1544 is enabled when SHDN is driven high
(Figure 2). The reference powers up first. Once the ref-
erence exceeds its UVLO threshold, the PWM controller
evaluates the DAC target and starts switching.
Table 1. Component Selection for Standard Multiphase Applications
Input Voltage Range
VID Output Voltage
(D4–D0)
Suspend Voltage
(SUS, S0–S1)
Maximum Load Current
Number of Phases (η
Inductor (per Phase)
Switching Frequency
High-Side MOSFET
(N
Low-Side MOSFET
(N
Total Input Capacitance (C
Total Output Capacitance
(C
Current-Sense Resistor
(R
SENSE
H
L
OUT
, per phase)
, per phase)
)
DESIGNATION
, per Phase)
______________________________________________________________________________________
AMD Hammer CPU Core Power Supplies
TOTAL
IN
)
Dual-Phase, Quick-PWM Controller for
)
Power-Up Sequence
0.6µH Panasonic ETQP1H0R6BFA
Taiyo Yuden TMK432BJ106KM or
International Rectifier (2) IRF6604
International Rectifier (2) IRF6603
AMD MOBILE COMPONENTS
Panasonic ERJM1WTJ1M0U
Siliconix (1) Si7886DP or
Siliconix (2) Si7442DP or
TDK C4532X5R1E106M
300kHz (TON = REF)
Sanyo 2R5TPD680M
Circuit of Figure 1
(D4–D0 = 00010)
(4) 680µF, 2.5V
(SUS = GND)
(8) 10µF, 25V
(1) MAX1544
Two phases
MAX1544
7V to 24V
Not used
1mΩ
1.5V
60A
For the MAX1544, the slew-rate controller ramps up the
output voltage in 25mV increments to the proper operat-
ing voltage (see Tables 3 and 4) set by either D0–D4
(SUS = GND) or S0–S1 (SUS = REF or high). The ramp
rate is set with the R
Transition Timing section).
The ramp rate is set with the R
Output Voltage Transition Timing section). The con-
troller pulls VROK low until at least 3ms after the
MAX1544 reaches the target DAC code.
Fairchild (2) FDS6688 or Siliconix (1) Si7442DP
International Rectifier (1) IRF7811W
0.7µH Panasonic ETQP2H0R7BFA
Taiyo Yuden TMK432BJ106KM or
AMD DESKTOP COMPONENTS
or 0.8µH Sumida CDEP105L-0R8
TIME
(1) MAX1544 + (2) MAX1980
Panasonic ERJM1WTJ1M0U
or Fairchild (1) FDS6694
TDK C4532X5R1E106M
300kHz (TON = REF)
resistor (see the Output Voltage
Sanyo 2R5TPD680M
Circuit of Figure 12
(D4–D0 = 00010)
(5) 680µF, 2.5V
(SUS = GND)
(8) 10µF, 25V
Four phases
MAX1544
7V to 24V
Not used
1mΩ
1.5V
70A
TIME
resistor (see the
17