A8600 Datasheet, PDF (11/52 Pages) Allegro MicroSystems – Designed to provide the power supply requirements of next generation car audio and infotainment systems, the A8600 provides all the control and protection circuitry to produce...

A8600
Quadruple Output Regulator with Two High-Side Switches,
BU/ACC Voltage Detectors, and Mute Delay
ELECTRICAL CHARACTERISTICS (continued) Valid at 5.5 V ≤ V_INx ≤ 26 V, –40°C ≤ T_A ≤ 125ºC, –40°C ≤ T_J ≤ 125ºC;
unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
SW1 (ALWAYS-ON, LOW IQ, PWM/PFM REGULATOR) (continued)
Error Amplifier (continued)
Output Current
Maximum Output Voltage
Minimum Output Voltage
COMP1 Pull Down Resistance
Pulse Width Modulation (PWM)
I_EA1
V_EAO(max)1
V_EAO(min)1
R_COMP1
V_COMP1 = 1.2 V
Fault condition
−
±75
−
1.3
1.7
2.1
−
−
200
−
1
−
PWM Ramp Offset
Minimum Controllable On-Time
Minimum Switch Off-Time
COMP1 to SW1 Current Gain
Slope Compensation
Overcurrent Protection (OCP)
V_PWMOFFSET1 V_COMP1 set for 0% duty cycle
t_ON(MIN)1
t_OFF(MIN)1
g_mPOWER1
S_E1
−
400
−
80
140
180
40
95
135
−
3.6
−
300
450
600
Pulse-by-Pulse Current Limit
Overvoltage Protection (OVP)
I_LIM1
t_ON1 = t_ON(MIN)1 , f_SW = f_OSC
t_ON1 = (1 / f_OSC) – t_OFF(MIN)1 , f_SW = f_OSC
3.9
4.4
4.9
3.0
3.5
4.0
Output Overvoltage Threshold (SW1
Disable)
V_OVO1 V_FB1 rising, PWM mode
840
860
880
Overvoltage Hysteresis
Soft Start
V_OVOHYS1 V_FB1 falling, relative to V_OVO1
−
−10
−
SS1 Hiccup Reset Voltage
V_SSRST1
SS1 Switching Frequency
f_SS1
SS1 Startup (Source) Current¹
I_SSSU1
SS1 Hiccup (Sink) Current¹
I_SSHIC1
SS1 Delay Time
t_dSS1
SS1 Ramp Time
t_SSRAMP1
SS1 Pull Down Resistance
R_SSFLT1
Hiccup Mode (PWM only, not in PFM)
V_SS1 falling due to R_SSFLT1
0 V < V_FB1 < 300 mV, V_COMP1 at maximum
0 V < V_FB1 < 300 mV
300 mV < V_FB1
Hiccup mode disabled (no fault condition)
Hiccup mode enabled
CSS1 = 0.68 μF
CSS1 = 0.68 μF
Fault condition
140
−
−
−
−2.50
0.75
−
−
−
200
f_SW1/4
f_SW1/2
f_SW1
−2.00
1.00
136
272
5
275
−
−
−
−1.50
1.25
−
−
−
Hiccup OCP Enable Threshold
V_HICEN1 V_SS1 rising
−
2.3
−
Hiccup Operation OCP Count
t_OCPLIM1
V_SS1 > 2.3 V, V_FB1 < 0.3 V
V_SS1 > 2.3 V, V_FB1 > 0.3 V
−
30
−
−
118
−
Hiccup Operation BOOT Shorted
Count
t_BOOTUV1
−
30
−
Hiccup Operation BOOT Open Count t_BOOTOPEN1
−
7
−
Unit
μA
V
mV
kΩ
mV
ns
ns
A/V
mA/μs
A
A
mV
mV
mV
kHz
kHz
kHz
μA
μA
ms
ms
kΩ
V
PWM
cycles
PWM
cycles
PWM
cycles
PWM
cycles
Continued on the next page…
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com