MAX8770GTL+T Maxim Integrated Products, MAX8770GTL+T Datasheet - Page 15

• 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
CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
PIN
10
11
12
13
14
15
16
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
(MAX8771)
/MAX8772)
(MAX8771)
(MAX8770/
(MAX8770
MAX8772)
CSN12
NAME
GNDS
CSN2
CSN1
CSP2
CSP1
REF
CCI
FB
______________________________________________________________________________________
Current-Balance Compensation. Connect a 470pF capacitor between CCI and the positive side of the
feedback remote sense (or between CCI and GND). CCI is internally forced low in shutdown.
2.0V Refer ence Outp ut. Byp ass to G N D w i th a 1µF m a x im u m l ow - E S R ( cer am i c) cap aci tor . C an sour ce
500µA for exter nal l oad s. Load i ng RE F d eg r ad es O U T accur acy, accor d i ng to the RE F l oad - r eg ul ati on er r or .
Output of the DC-Voltage Positioning Transconductance Amplifier. Connect a resistor R
the positive side of the feedback remote sense to set the DC steady-state droop based on the voltage-
positioning gain requirement:
where R
the current-sense resistors that are used to provide the (CSP_, CSN_) current-sense voltages. If lossless
sensing is used, R
thermistor to minimize the temperature dependence of the voltage-positioning slope. DC droop can be
disabled by shorting FB to the positive remote-sense point. FB is high impedance in shutdown.
Feedback Remote-Sense Input, Negative Side. Normally connected to GND directly at the load. GNDS
internally connects to a transconductance amplifier that fine tunes the output voltage— compensating for
voltage drops from the regulator ground to the load ground.
Positive Input of the Output Current Sense of Phase 2. This pin should be connected to the positive side of
the output current-sensing resistor or the filtering capacitor if the DC resistance of the output inductor is
utilized for current sensing. Tie this pin to V
Combined Negative Current-Sense Input for Phases 1 and 2. The negative current-sense signals of the
two phases (taken from the negative sides of the output current-sensing resistors or the filtering capacitors
if the DC resistances of the output inductors are utilized for current sensing) are resistively averaged, and
the resulting signal is connected to this pin. Pay special attention to board layout to maximize current-
sensing accuracy; either place the sense elements (inductors for lossless sensing or sense resistors)
close to each other, or equalize the layout paths and PC board trace resistances between the sense
elements and the remote load. CSN12 is also used as the voltage input to the power monitor.
Negative Input of the Output Current Sense of Phase 2. This pin should be connected to the negative side
of the output current-sensing resistor or the filtering capacitor if the DC resistance of the output inductor is
utilized for current sensing. CSN2 is also used as the voltage input to the power monitor.
Positive Input of the Output Current Sense of Phase 1. This pin should be connected to the positive side of
the output current-sensing resistor or the filtering capacitor if the DC resistance of the output inductor is
utilized for current sensing.
Negative Input of the Output Current Sense of Phase 1. This pin should be connected to the negative side
of the output current-sensing resistor or the filtering capacitor if the DC resistance of the output inductor is
utilized for current sensing.
DROOP
is the desired voltage-positioning slope and G
SENSE
= R
L
. In this case, consider making R
R
FB
= R
CC
DROOP
for 1-phase operation.
FUNCTION
/ (R
SENSE
Pin Description (continued)
x G
m(FB)
FB
m(FB)
a resistor network that includes an NTC
= 600µS (typ). R
®
)
IMVP-6 LICENSEES
SENSE
FB
between FB and
is the value of
15