Allegro MicroSystems A8600 Manual page 17

A8600
ELECTRICAL CHARACTERISTICS (continued)
unless otherwise specified
Characteristic
SW4 (SYNCHRONOUS BUCK CONTROLLER WITH GATE DRIVERS) (continued)
Pulse Width Modulation (PWM)
PWM Ramp Offset
COMP4 Cycle Skip Level
Minimum Controllable On-Time
Minimum Switch Off-Time
COMP4 to SW4 Current Gain
Slope Compensation
Overcurrent Protection (OCP)
Pulse-by-Pulse Current Limit
Power OK (POK) Thresholds for Overvoltage (OV) and Undervoltage (UV)
POK Threshold for Overvoltage
POK Hysteresis for Overvoltage
POK Threshold for Undervoltage
POK Hysteresis for Undervoltage
Power OK (POK) Filtering
POK Delay / De-glitch
Soft Start
SS4 Hiccup Reset Voltage
SS4 Switching Frequency
SS4 Startup (Source) Current
SS4 Hiccup (Sink) Current 1
SS4 Delay Time
SS4 Ramp Time
SS4 Pull Down Resistance
SS4 Startup Current Ratio
Continued on the next page...
Quadruple Output Regulator with Two High-Side Switches,
Symbol
V V
PWMOFFSET4 COMP4
V V < 2.3 V
COMPSKIP4 SS4
t
ON(MIN)4
t
OFF(MIN)4
g
mPOWER4
S
E4
t = t
ON4 ON(MIN)4
I
LIM4
t = (1 / f
ON4
V V rising
POKOV4 FB4
V V falling, relative to V
POKOVHYS4 FB4
V V falling
POKUV4 FB4
V V rising, relative to V
POKUVHYS4 FB4
V Response to a step input
POKDELAY4
V V falling due to R
SSRST4 SS4
0 V < V
f 0 V < V
SS4
300 mV < V
1 I Hiccup mode disabled (no fault condition)
SSSU4
I Hiccup mode enabled
SSHIC4
t CSS4 = 22 nF
dSS4
t CSS4 = 22 nF
SSRAMP4
R Fault condition
SSFLT4
I Relative to I
SSSUTRK4
BU/ACC Voltage Detectors, and Mute Delay
Valid at 5.5 V ≤ V ≤ 26 V, –40°C ≤ T
INx
Test Conditions
set for 0% duty cycle
) – t , f = f
OSC OFF(MIN)4 SW OSC
POKOV4
POKUV4
SSFLT4
< 300 mV, V at maximum
FB4 COMP4
< 300 mV
FB4
FB4
or I
SSSU2 SSSU3
≤ 125ºC, –40°C ≤ T ≤ 125ºC;
A J
Min. Typ. Max.
− 400 −
− 200 −
40 100 150
80 120 160
− 63 −
4.5 6.8 9.0
62 75 88
48 60 72
840 860 880
− −10 −
720 740 760
− 10 −
− 6 −
140 200 275
− f /4 −
SW4
− f /2 −
SW4
− f −
SW4
−30 –20 −10
5 10 20
− 440 −
− 880 −
− 5 −
−15 − +15
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Unit
mV
mV
ns
ns
(A•mΩ)/V
mV/μs
mV
mV
mV
mV
mV
mV
µs
mV
kHz
kHz
kHz
μA
μA
μs
μs
KΩ
%
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