MAX686 데이터 시트보기 (PDF) - Maxim Integrated
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MAX686 Datasheet PDF : 16 Pages
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DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ELECTRICAL CHARACTERISTICS
(VCC = VDD = VIN = +5V, CREF = 0.1µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX UNITS
Supply Voltage (Note 1)
Input Voltage
Supply Current
Shutdown Current
VCC Undervoltage Lockout
LX
LX Voltage Range
LX Switch Current Limit
VCC, VDD
VIN
ICC + IDD
ISHDN
VLOCK
Voltage applied to L1
POL = GND, VFB = 1.3V, IDACOUT = 0mA
SHDN = GND
Rising or falling
VLX
ILX
ISET = VCC
ISET = GND
2.7
0.8
2.10
0.4
0.2
5.5
V
VOUT
V
125
µA
4
µA
2.65
V
28
V
0.6
A
0.3
LX On-Resistance
LX Leakage Current
Maximum LX On-Time
Minimum LX Off-Time
REFERENCE AND FB INPUT
REF Output Voltage
REF Load Regulation
FB Set Point
FB Input Bias Current
RLX
ILXLEAK
tON
tOFF
VCC = VDD = 5V, ILX = 100mA
VCC = VDD = 3.3V, ILX = 100mA
VLX = 28V
POL = GND, VFB > 1.2V
POL = VCC, VFB < 0.15V
POL = GND, VFB < 0.8V
POL = VCC, VFB > 0.4V
VREF
VFB
IFB
VCC = VDD = 2.7V to 5.5V, no load
IREF = 0µA to 25µA, CREF = 0.1µF
POL = GND
POL = VCC
7.5
0.7
2.8
3.8
3.8
1.22
1.22
-15
1.2
Ω
1.6
1.5
µA
12.5 µs
1.3
4.2
µs
6.2
6.2
1.28
V
10
mV
1.28
V
15
mV
±50 nA
POWER OK COMPARATOR, LCDON OUTPUT
POK Threshold
VPOK
VPOK rising
POK Input Current
LCDON Sink Current
IPOK
ILCDON
V LCDON = 0.4V, VPOK = 1.25V
DAC OUTPUT (Notes 2, 3)
1.05
1.20
V
±50 nA
2
mA
Full-Scale Output Voltage
VFS
-50µA < IDACOUT < 0µA
VREF -
0.02
VREF +
0.02
V
Zero-Scale Output Voltage
Resolution
VZS
0µA < IDACOUT < 20µA
0
15
mV
6
Bits
Mid-Scale Accuracy
MSA
Mid-scale = VREF x 32/63
-3
3
%
LOGIC INPUTS: POL, ISET, UP, DN, SHDN
Input Low Level
VIL
2.7V < VCC = VDD < 5.5V
0.7
V
Input High Level
VIH
2.7V < VCC = VDD < 5.5V
2.4
V
Input Bias Current
IBIAS
±1
µA
Note 1: The MAX686 requires a supply voltage at VCC = VDD between +2.7V and +5.5V; however, the voltage that supplies the
inductor can vary from +0.8V to +27.5V, depending on circuit operating conditions.
Note 2: The DAC output is set to its midpoint value at power-on.
Note 3: The DAC setting is guaranteed to remain valid as long as VCC is greater than the VCC DAC Reset Threshold.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
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