PDF《定购信息》

28 V VIN = VCC 4.5 5.5 Quiescent Supply Current IIN VFB1 = VFB2 = 0.9V, no switching 4.5

6 mA Standby Supply Current IIN_SBY VEN1 = VEN2 = VSGND 0.21 0.35 mA VCC REGULATOR Output Voltage VCC 6V <

VIN <

28V, ILOAD = 5mA 5.00 5.2 5.50 V VIN = 6V, 1mA <

ILOAD <

100mA VCC Regulator Dropout ILOAD = 100mA 0.07 V VCC Short-Circuit Output Current VIN = 5V

150 250 mA VCC Undervoltage Lockout VCC_UVLO VCC falling 3.6 3.8

4 V VCC Undervoltage Lockout Hysteresis

430 mV ERROR AMPLIFIER (FB_, COMP_) FB_ Input Voltage Set-Point VFB_

594 600

606 mV FB_ Input Bias Current IFB_ VFB_ = 0.6V -250 +250 nA ??2 Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to http://www.maximintegrated.com/thermal-tutorial. Package Thermal Characteristics (Note 2) Absolute Maximum Ratings (VIN = 12V, RT = 33k?, CVCC = 4.7?F, CIN = 1?F, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FB to COMP Transconductance gm ICOMP = ±40?A

650 1200

1900 ?S Amplifier Open-Loop Gain No load

80 dB Amplifier Unity-Gain Bandwidth

10 MHz COMP_ Swing (High) 2.4 V COMP_ Swing (Low) No load at COMP_ 0.6 V COMP_ Source/Sink Current ICOMP_ | ICOMP_ |, VCOMP_ = 1.5V

45 80

120 ?A ENABLE (EN_) EN_ Input High VEN_H EN_ rising 1.15 1.20 1.25 V EN_ Input Hysteresis VEN_HYS

150 mV EN_ Input Leakage Current ILEAK_EN_ -250 +250 nA OSCILLATOR Switching Frequency fSW Each converter

460 500

540 kHz Switching Frequency Adjustment Range (Note 4)

200 1000 kHz PWM Ramp Peak-to-Peak Amplitude VRAMP 1.42 V PWM Ramp Valley VVALLEY 0.72 V Phase Shift Between Channels From DH1 to DH2 rising edges

180 Degrees Minimum Controllable On-Time

60 100 ns Maximum Duty Cycle

86 87.5 % OUTPUT DRIVERS DH_ On-Resistance Low, sinking 100mA, VBST_ - VLX_ = 5V

1 ? High, sourcing 100mA, VBST_ - VLX_ = 5V 1.2 DL_ On-Resistance Low, sinking 100mA, VCC = 5.2V 0.75 ? High, sourcing 100mA, VCC = 5.2V 1.4 DH_ Peak Current CLOAD = 10nF Sinking

3 A Sourcing

2 DL_ Peak Current CLOAD = 10nF Sinking

3 A Sourcing

2 DH_, DL_ Break-Before-Make Time (Dead Time)

15 ns SOFT-START Soft-Start Duration

2048 Switching cycles Reference Voltage Steps

64 Steps ??3 Electrical Characteristics (continued) (VIN = 12V, RT = 33k?, CVCC = 4.7?F, CIN = 1?F, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) Electrical Characteristics (continued) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CURRENT LIMIT/HICCUP Cycle-by-Cycle, Low-Side, Source Peak Current-Limit Threshold Adjustment Range Source peak limit = VLIM_/10

30 300 mV LIM_ Reference Current ILIM_ VLIM_ = 0.3V to 3V, TA = +25°C

45 50

55 ?A LIM_ Reference Current TC VLIM_ = 0.3V

2400 ppm/°C Number of Consecutive Current- Limit Events to Hiccup

7 Events Hiccup Timeout Out of soft-start

7936 Switching cycles Cycle-by-Cycle, Low-Side, Sink Peak Current-Limit Sense Voltage VLIM_/

20 V BOOST Boost Switch Resistance VIN = VCC = 5.2V, IBST_ = 10mA 4.5