NCP4208 Datasheet, PDF (2/30 Pages) ON Semiconductor – VR11.1 Programmable 8-Phase Synchronous Buck Converter with PMBus

NCP4208
VCC
39
SHUNT
REGULATOR
VCC3
1
3.3 V
REGULATOR
SCL SDA
5
4
UVLO
SHUTDOWN
GND 7
EN/VTT 6
850 mV
SMBUS
RT RAMPADJ
12
13
OSCILLATOR
CONTROL
CSREF
CONTROL
PWRGD 2
DELAY
CONTROL
CURRENT
BALANCING
CIRCUIT
ALERT 3
COMPARATORS
EN
FB
FBRTN
IMON
MUX
DIGITAL
REGISTERS
ADC
CONTROL
CMP
CMP
CMP
CMP
CMP
CMP
CMP
48 PSI
21 ODN
SET EN
RESET
22 OD1
38 PWM1
RESET
RESET
RESET
RESET
1− 8 PHASE
DRIVER
LOGIC
RESET
37 PWM2
36 PWM3
35 PWM4
34 PWM5
33 PWM6
32 PWM7
RESET
31 PWM8
CMP
RESET
CROWBAR
CURRENT
LIMIT
30 SW1
29 SW2
28 SW3
27 SW4
26 SW5
25 SW6
24 SW7
23 SW8
ILIMITFS 20
IREF 11
COMP 15
CONTROL
CURRENT
MEASUREMENT
AND LIMIT
CONTROL
19 CSCOMP
17 CSREF
18 CSSUM
10 IMON
16 FB
NCP4208
PRECISION
REFERENCE
14
FBRTN
CONTROL
VID DAC
47
46
45
44
43
42
41
40
VID0 VID1 VID2 VID3 VID4 VID5 VID6 VID7
Figure 1. Simplified Block Diagram
BOOT VOLTAGE
AND SOFT−START
CONTROL
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2