MAX8770GTL+T Maxim Integrated Products, MAX8770GTL+T Datasheet - Page 35

• Manufacturer Part Number: MAX8770GTL+T
• Description: IC CTLR PS 2/1PH QUICK PWM 40QFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8770GTL+T

• Applications: Controller, Intel IMVP-6
• Voltage - Input: 4 ~ 26 V
• Number Of Outputs: 1
• Voltage - Output: 0.125 ~ 1.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PWM Controller for IMVP-6+ CPU Core Power Supplies
ing the inductor value. Generally, low inductor values
produce a broader efficiency vs. load curve, while
higher values result in higher full-load efficiency
(assuming that the coil resistance remains fixed) and
less output-voltage ripple. Penalties for using higher
inductor values include larger physical size and
degraded load-transient response, especially at low
input-voltage levels.
CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
Figure 9. Power-Up and Shutdown Sequence Timing Diagram
PWM CONTROL
VID (D0–D6)
INTERNAL
PHASEGD
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWRGD
CLKEN
1/8th SLEW RATE SET
V
SHDN
CORE
V
CC
SOFT-START =
______________________________________________________________________________________
BY R
TIME
INVALID
CODE
60µs TYP
t
BLANK
FORCED PWM
t
20µs TYP
BLANK
The MAX8770/MAX8771/MAX8772 are enabled when
SHDN is driven high (Figure 9). The reference powers
up first. Once the reference exceeds its UVLO thresh-
old, the internal analog blocks are turned on and
masked by a 150µs one-shot delay. The PWM con-
troller then begins switching.
Power-on reset (POR) occurs when V
approximately 2V, resetting the fault latch and prepar-
ing the controller for operation. The V
5ms TYP
t
BLANK
Power-Up Sequence (POR, UVLO)
FORCED PWM
®
t
20µs TYP
BLANK
IMVP-6 LICENSEES
INVALID
CODE
SOFT-SHUTDOWN =
1/8th SLEW RATE SET
BY R
CC
TIME
CC
UVLO circuitry
rises above
35