Quadruple Output Regulator with Two High-Side Switches,
BU/ACC Voltage Detectors, and Mute Delay
A8600
9
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS Valid at 5.5 V ≤ VINx ≤ 26 V, –40°C ≤ TA ≤ 125ºC, –40°C ≤ TJ ≤ 125ºC;
unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
GENERAL SPECIFICATIONS
Input Supply Current
Input Supply Current1IIN1 VBIAS > 3.2 V, ISW1 = 0 mA −7.5 10 mA
Input Supply Current, PFM1,3
(Using components shown in Typical
Application Circuit diagram and
table 3.)
ILO_IQ0
VIN1 = 12 V, VSW1 = 3.3 V, VEN/SYNC ≤ 0.4 V,
BUO and ACCO open, ISW1 = 40 µA, TA= 25ºC − − 50 µA
ILO_IQ1
VIN1 = 12 V, VSW1 = 5.0 V, VEN/SYNC ≤ 0.4 V,
BUO and ACCO open, ISW1 = 200 µA,TA
= 25ºC − − 250 µA
ILO_IQ2
VIN1 = 12 V, VSW1 = 6.5 V, VEN/SYNC ≤ 0.4 V,
BUO and ACCO open, ISW1 = 1 mA, TA = 25ºC − − 750 µA
Internal Oscillator Frequency
LX1/2/3/4 Switching Frequency fOSC 360 425 490 kHz
EN/SYNC Synchronization Timing
Synchronization Input Frequency fSYNC 325 −525 kHz
Synchronization Input Duty Cycle DSYNC 45 50 55 %
EN/SYNC Input
EN/SYNC Pin High Threshold VENIH
3.0 V < VBIAS < 3.6 V, VEN/SYNC rising − − 2.0 V
4.5 V < VBIAS < 5.5 V, VEN/SYNC rising − − 2.6 V
EN/SYNC Pin Low Threshold VENIL
3.0 V < VBIAS < 3.6 V, VEN/SYNC falling 0.8 − − V
4.5 V < VBIAS < 5.5 V, VEN/SYNC falling 1.2 − − V
EN/SYNC Hysteresis VENHYS
3.0 V < VBIAS < 3.6 V, VENIH – VENIL −200 −mV
4.5 V < VBIAS < 5.5 V, VENIH – VENIL −400 −mV
EN/SYNC Input Resistance RENIN 120 200 280 kΩ
EN/SYNC Turn-Off Delay
tdOFF
Measured from EN/SYNC pulled low to
SW2/3/4, S1/2, and TSD turned off −15 −PWM
cycles
tdLo_IQ
Measured from EN/SYNC pulled low or TSDH
going high to SW1 entering Low IQ mode −2048 −PWM
cycles
VREG Output and BIAS Input
VREG Output Voltage VVREG VBIAS = 0 V 2.95 3.05 3.175 V
VREG (REGOK rising) VREGPORHI VVREG rising 2.86 2.93 2.98 V
VREG (BIAS switch Off and POR) VREGPORLO VVREG falling 2.85 2.90 2.96 V
BIAS Switch Turn-On Threshold VBIAS(TH) VBIAS − VVREG −3 10 20 mV
Bias Switch Voltage Drop VBIASSW VBIAS − VVREG −45 70 mV
BIAS Input Voltage Range VBIAS 3.2 −5.5 V
Power OK (POK)
POK Low Condition Output Voltage VPOKO(L) IPOK = 3 mA − − 300 mV
POK Leakage1IPOK(LKG) VPOKO = 5.0 V −1 − 1 µA
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