MAX16930 Datasheet, PDF (26/29 Pages) Maxim Integrated Products – 2MHz, 36V, Dual Buck with Preboost and 20μA Quiescent Current

Maxim Integrated
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
Block Diagram
PGOOD1 COMP1
PGOOD LOW LEVEL
PGOOD HIGH LEVEL PGOOD
COMP
DC-DC1
CONTROL LOGIC
FB1
FEEDBACK
SELECT LOGIC
EAMP1
MAX16930
INTERNAL
SOFT START
OUT1
80 mV(TYP) MAX
DIFFERENTIAL INPUT
CS1
CSA1
EN1
SLOPE
COMP LOGIC
REF = 1V
CL
CURRENT LIMIT
THRESHOLD
PWM1
ZERO
CROSS
COMP
FOSC
FSYNC
AGND
COMP2
FB2
OUT2
CS2
EN2
PGOOD2
CLK1
OSCILLATOR
SPREAD SPECTRUM
OPTION AVAILABLE WITH
INTERNAL CLOCK ONLY
EXTERNAL
CLOCK INPUT
FSYNC
SELECT LOGIC
TIED HIGH (PWM MODE)
TIED LOW (SKIP MODE)
CLK 180°
OUT OF PHASE
CLK2
DC-DC2 CONTROL LOGIC
SAME AS DC-DC1 ABOVE
EN1
BST1
PWM1
DH1
STEP-DOWN DC-DC1
CLK1
LX1
GATE DRIVE
ZX1
LOGIC
DL1
LX1
LX1
PGND1
VIN
BIAS INTERNAL LINEAR
BIAS
REGULATOR
SWITCHOVER
IF 3.1V <
VEXTVCC < 5.2V EXTVCC
EN2
PWM2
CLK2
STEP-DOWN DC-DC2
ZX2
GATE DRIVE
LOGIC
LX2
LX2
BST2
DH2
LX2
DL2
PGND2
CLK1
FSELBST
FSELBST
INPUT
INS
START-UP TURN
ON THRESHOLD
BOOST ON-OFF
THRESHOLDS
PRE-BST SNS
THRESHOLD
COMPARATOR
UVLO THRESHOLD
TIED LOW
TIED HIGH
EN3
BSTON
CS3P
CS3N
FB3
EN GOES
HIGH
BOOST EN
FLAG
CHECK FOR INS
THRESHOLDS
50 mV(TYP) MAX CSA3
DIFFERENT INPUT
CURRENT LIMIT
CL3
THRESHOLD
EAMP3
REF3 = 1.25V
LOW GAIN EAMP, NO
COMP PIN REQUIRED
IF LOW, CLK3 = CLK1
IF HIGH, CLK3 = CLK1/5
CLK3
BOOST
ENABLED
SLOPE COMP
LOGIC
PWM3
TERM
EN3
EP
BOOST
ENABLED
BIAS
VIN ^{STEP-UP DC-DC3}
PWM3
GATE DRIVE
LOGIC
CLK3
DC-DC3
CONTROL LOGIC
PGND3
DL3
IN
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