SLVS612 − APRIL 2006
3
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ELECTRICAL CHARACTERISTICS
TA = −40°C to 85°C, VIN = 12 Vdc, RT = 90.9 kΩ, fSW = 500 kHz, VEA_REF = 1.25 V, all parameters at zero power dissipation (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
VIN Input voltage range, VIN 10 40 V
OPERATING CURRENT
IDD Quiescent current Output drivers not switching,
VFB = 1.3 V 1.5 3.0 mA
BP5
VBP5 Ouput voltage ILOAD = 1 mA 4.5 5.0 5.5 V
OSCILLATOR/RAMP GENERATOR
fOSC Accuracy 9 V ≤ VIN ≤ 40 V 520 580 640 kHz
VRAMP PWM ramp voltage(1) VPEAK−VVAL 2.0
VIH High-level input voltage, SYNC 2 5 V
VIL Low-level input voltage, SYNC 0.8 V
ISYNC Input current, SYNC 5 10 µA
Pulse width, SYNC 50 ns
VRT RT voltage 2.38 2.50 2.58 V
VFB = 0 V, fSW ≤ 600 kHz 90%
Maximum duty cycle VFB = 0 V, 600 kHz ≤ fSW ≤ 1 MHz 85%
Minumum duty cycle VFB ≥ EA_REF + 0.05 V 0%
SOFT START
ISS Soft-start source current 1.65 2.35 3.05 µA
VSS Soft-start clamp voltage 3.7 V
tDSCH Discharge time CSS = 220 pF 1.6 2.2 2.8
tSS Soft-start time CSS = 220 pF, 0 V ≤ VSS ≤ 1.6 V 100 155 205 µs
BP10
VBP10 Ouput voltage 9.0 9.6 10.3 V
ERROR AMPLIFIER
VEA_REF Error amplifier reference input voltage(1)(2) 10 V ≤ VIN ≤ 40 V 0.2 2.5 V
Input offset voltage 0.5 V ≤ VFB ≤ 2.25 V −6 6 mV
Input offset voltage 0.2 V ≤ VFB ≤ 0.5 V −10 0 10 MV
GBW Gain bandwidth 0.2 V ≤ VFB ≤ 0.5 V 1.5 3.5 MHz
GBW Gain bandwidth 0.5 V ≤ VFB ≤ 2.25 V 2.5 5.0 MHz
AVOL Open loop gain 60 80 dB
IOH High-level output source current 1.5 4.0
IOL Low-level output sink current 2.0 4.0 mA
VOH High-level output voltage ISOURCE = 500 µA 3.2 3.5
VOL Low-level output voltage ISINK = 500 µA 0.20 0.35 V
IBIAS Input bias current VFB = 1.2 V 100 200 nA
(1) Ensured by design. Not production tested.
(2) Common mode range extends to ground, but not tested below 200 mV.