MAX669 데이터 시트보기 (PDF) - Maxim Integrated
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MAX669 Datasheet PDF : 18 Pages
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1.8V to 28V Input, PWM Step-Up
Controllers in µMAX
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..........................................................-0.3V to +30V
PGND to GND....................................................................±0.3V
SYNC/SHDN to GND .............................................-0.3V to +30V
EXT, REF to GND.....................................-0.3V to (VLDO + 0.3V)
LDO, FREQ, FB, CS+ to GND ................................ -0.3V to +6V
LDO Output Current...........................................-1mA to +20mA
REF Output Current..............................................-1mA to +1mA
LDO Short Circuit to GND .........................................Momentary
REF Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering,10sec) ..............................+300°C
Soldering Temperature (Reflow) ......................................+300°C
Lead(Pb)-Free Packages..............................................+260°C
Packages Containing Lead(Pb)....................................+240°C
ELECTRICAL CHARACTERISTICS
(VCC = VLDO = +5V, ROSC = 200kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX
PPWWMM CCoOnNtrToRllOerLLER
Input Voltage Range, VCC
MAX668
MAX669
3
28
1.8
28
Input Voltage Range with VCC Tied to LDO
2.7
5.5
FB Threshold
1.225 1.250 1.275
FB Threshold Load Regulation
Typically 0.013% per mV on CS+;
VCS+ range is 0 to 100mV for 0 to full
load current.
0.013
UNITS
V
V
V
%/mV
FB Threshold Line Regulation
FB Input Current
Current Limit Threshold
Idle Mode Current-Sense Threshold
CS+ Input Current
VCC Supply Current (Note 1)
Shutdown Supply Current (VCC)
REefFeEreRnEcNeCaEndANLDOLDROegRuElaGtoUrLsATORS
LDO Output Voltage
Undervoltage Lockout Threshold
REF Output Voltage
REF Load Regulation
REF Undervoltage Lockout Threshold
OSscCilIlLaLtoAr TOR
Oscillator Frequency
Typically 0.012% per % duty factor on
EXT; EXT duty factor for a step-up is:
100% (1 – VIN/VOUT)
VFB = 1.30V
CS+ forced to GND
VFB = 1.30V, VCC = 3V to 28V
SYNC/SHDN = GND, VCC = 28V
0.012
%/%
1
20
nA
85
100
115
mV
5
15
25
mV
0.2
1
µA
220
350
µA
3.5
6
µA
LDO load =
5V ≤ VCC ≤ 28V
(includes LDO dropout)
4.50
5.00
5.50
∞ to 400Ω
3V ≤ VCC ≤ 28V
(includes LDO dropout)
2.65
5.50
V
Sensed at LDO, falling edge,
hysteresis = 1%, MAX668 only
2.40 2.50 2.60
V
No load, CREF = 0.22µF
REF load = 0 to 50µA
Rising edge, 1% hysteresis
1.225 1.250 1.275
V
-2
-10
mV
1.0
1.1
1.2
V
ROSC = 200kΩ ±1%
ROSC = 100kΩ ±1%
ROSC = 500kΩ ±1%
225
250
275
425
500
575
kHz
85
100
115
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