MAX1981A Maxim Integrated Products, MAX1981A Datasheet - Page 16

• Manufacturer Part Number: MAX1981A
• Description: (MAX1907A / MAX1981A) Quick-PWM Master Controllers
• Manufacturer: Maxim Integrated Products

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Quick-PWM Master Controllers for Voltage-
Positioned CPU Core Power Supplies (IMVP-IV)
Table 1. Component Selection for Standard Multiphase Applications (Figure 1)
* Input voltages less than 8V requires additional input capacitance.
16
Input Voltage Range*
VID Output Voltage (D5–D0)
Boot Voltage (B0–B2)
Suspend Voltage (S0–S2)
Deep-Sleep Offset Voltage
(POS, NEG)
Maximum Load Current
Inductor (per phase)
Switching Frequency
High-Side MOSFET
(N
H
PIN
37
38
39
40
______________________________________________________________________________________
, per phase)
DESIGNATION
IMVPOK
CLKEN
NAME
TIME
TON
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 whenever the slew-rate
control is active (output voltage transitions). IMVPOK is forced low in shutdown. A pullup resistor on
IMVPOK will cause additional finite shutdown current. IMVPOK also reflects the state of SYSPOK and
includes a 3ms (min) delay for power-up. IMVPOK is forced high during VID transitions.
Clock Enable Logic Output. This inverted logic output indicates when SYSPOK is high and the output
voltage sensed at FB is in regulation. CLKEN is forced low during VID transitions.
Slew-Rate Adjustment Pin. Connect a resistor from TIME to GND to set the internal slew-rate clock. A 235kΩ
to 23.5kΩ resistor sets the clock from 64kHz to 640kHz, f
On-Time Selection Control Input. This four-level input sets the K-factor value (Table 3) used to determine
the DH on-time (see the On-Time One-Shot section). GND = 1000kHz, REF = 550kHz, OPEN = 300kHz,
V
CC
= 200kHz.
8V to 24V
1.308V (D5–D0 = 011001)
1.004V
(B2 = OPEN, B1 = V
B0 = GND)
0.748V
(S2 = OPEN, S1 = V
S0 = GND)
-50mV
40A
0.6µH
Sumida CDEP134H-0R6,
Panasonic ETQP6F0R6BFA, or
BI Technologies HM73-30R60
300kHz (TON = float)
International Rectifier
(2) IRF7811W or
Siliconix (2) Si4892DY
COMPONENT
CC
CC
,
,
Low-Side MOSFET
(N
Input Capacitor (C
Output Capacitor (C
Current-Sense Resistor
(R
Schottky Diodes
(D1, D2, D3)
FUNCTION
SENSE
L
, per phase)
DESIGNATION
, per phase)
SLEW
Pin Description (continued)
= 320kHz
IN
OUT
)
)
✕
47kΩ/R
International Rectifier
(2) IRF7822,
Fairchild (3) FDS7764A, or
Siliconix (2) Si4860DY
(6) 10µF 25V
Taiyo Yuden
TMK432BJ106KM or
TDK C4532X5R1E106M
(5) 330µF 2.5V Panasonic
EEFUE0E331XR
1.5mΩ
Panasonic ERJM1WTJ1M5U
Central Semiconductor
CMPSH-3
TIME
COMPONENT
.