MAX8664 Maxim Integrated Products, MAX8664 Datasheet - Page 8

• Manufacturer Part Number: MAX8664
• Description: Step-Down Controller
• Manufacturer: Maxim Integrated Products

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Low-Cost, Dual-Output, Step-Down
Controller with Fast Transient Response
Figure 1. Functional Diagram
8
REFIN2
FB2
V
FB1
_______________________________________________________________________________________
CC
IN
6.5V LDO
REF
SOFT-START 1
GENERATOR
REFERENCE
VOLTAGE
BIAS
OPEN S1 AND CLOSE S2.
OTHERWISE, CLOSE S1
REF
IF V
AND OPEN S2.
REFIN2
SHUTDOWN
THERMAL
S2
S1
0.6V
REF2
> 2.0V
1.5V
EN
SHUTDOWN 1
REF
VL
V
CC
SHUTDOWN
CONTROL
SHUTDOWN
THERMAL
LOGIC
50mV
COMPARATOR 1
CIRCUITRY
COMPARATOR 2
SHUTDOWN 2
UVLO
EN
PWM
SHUTDOWN
PWM
THERMAL
ENABLE2
REF1 - 0.1V
REF2 - 0.1V
CLOCK 1
SOFT-START
CLOCK 2
FB1
FB2
CONTROL
CONTROL
CURRENT-LIMIT
CURRENT-LIMIT
CLOCK 1
CLOCK 2
COMPARATOR
COMPARATOR
LOGIC
LOGIC
SHUTDOWN 1
LX2
LX1
50μA
50μA
SHUTDOWN 2
ENABLE
CHARGING SWITCH
OSCILLATOR
CHARGING SWITCH
BST CAP
BST CAP
4μA
LX1
ILIM1
BST1
DH1
DL1
PGND
VL
ILIM2
BST2
DH2
LX2
DL2
OSC/EN12
PWRGD
GND