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A8650 Datasheet(PDF) 4 Page - Allegro MicroSystems

Part # A8650
Description  Low Input Voltage, Adjustable Frequency 2 A Synchronous Buck Regulator with EN/SYNC and Power OK
PDF  31 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8650 Datasheet(HTML) 4 Page - Allegro MicroSystems

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Low Input Voltage, Adjustable Frequency
2 A Synchronous Buck Regulator with EN/SYNC and Power OK
A8650
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Block Diagram
125 ns
Regulators
ON
VIN 0.8V
POR
Off
Off
S
R
Q
Q
FAULT = 1, if:
EN = 0 or
UVLO = 1
+
-
EN/SYNC
VREF
HICCUP = 1 if:
FB < 625 mV and
COMP
≈ 1.25 V and
7 OCP events
EN
EN/SYNC
SS
FB
UV / OV
TSD
Reset
Dominant
Sleep
OV
tOFF(MIN)
GND
FAULT
PWM_CLK
CURRENT
CURRENT
FBOK
Falling
Delay
Oscillator
ADJ
Slope
ADJ
Compensation
Current Sense
fOSC
fSYNC
VSSOFFS
FBOK
COMP
CLAMP_ACTIVE
CLAMP_ACTIVE
VPWMOFFS
POK
Comparator
OVP
Comparator
PAD
+
-
+
Error
Amplifier
Digital
Delay
POK
7 PWM
Cycles
92% x VREF
88% x VREF
115% x VREF
111% x VREF
10 ns
VIN
1.5 kΩ
2 kΩ
POR
200 mV
VIN
POR
VIN
20 µA
PWM
Comparator
10 µA
OFF
Clamp
1.25 V
FSET
1.65 V (typ)
1.25 V (typ)
0.8 V (max)
55 mΩ
Protection
EN_HICCUP
VIN (UVLO)
EN / CLR
HICCUP
LATCHED
HIC RST (100 mV)
CURRENT (OCP)
OCP COUNT EN
FB
HICCUP
+
-
350 mV
70 mΩ
HICCUP
EN/SYNC >
1.2 x fOSC
Non-Overlap
FB
OFF
OFF
100 kΩ
SW
PGND
150 nA



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