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MAX1684 Datasheet(PDF) 4 Page - Maxim Integrated Products

Part No. MAX1684
Description  Low-Noise, 14V Input, 1A, PWM Step-Down Converters
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1684 Datasheet(HTML) 4 Page - Maxim Integrated Products

 
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Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(VIN = V SHDN = +6V, STBY = SYNC/PWM = CVL, VBOOT = VOUT, FB = AGND, circuit of Figure 1, TA = -40°C to +85°C, unless other-
wise noted.) (Note 5)
Note 1: The output adjust range with BOOT connected to VOUT is VREF to 5.5V. Connect BOOT to AGND for VOUT > 5.5V.
Note 2: The quiescent power-consumption specifications include chip supply and gate-drive loss only. Divide these values by VIN
(= 6V) to obtain quiescent currents. In normal and low-power modes, chip supply current dominates and quiescent power
is proportional to VBOOT (BOOT connected to OUT). In PWM mode, gate-drive loss dominates and quiescent power is pro-
portional to VIN · (VIN - VCVH). In addition, IR losses in power switches and external components typically increase PWM
quiescent power consumption by 5mW to 10mW. Note that if the device is not bootstrapped, additional power will be dissi-
pated in the CVL linear regulator.
Note 3: When the duty factor (VOUT / VIN) is less than this value, the switching frequency decreases in PWM mode to maintain regu-
lation.
Note 4: Thermal shutdown is disabled in low-power mode (STBY = low) to reduce power consumption.
Note 5: Specifications to -40°C are guaranteed by design, not production tested.
CVL Undervoltage Lockout
Threshold
2.4
2.6
V
BOOT = AGND, CVL falling edge,
typical hysteresis is 40mV
Logic Input Low Voltage
VIL
0.7
Logic Input High Voltage
VIH
2
V
SHDN, STBY, SYNC/PWM
ILIM/SS Source Current
3.1
4.7
µA
VILIM/SS = 1.4V
0.27
Normal mode, SYNC/PWM = low,
VBOOT = 3.3V (Note 2)
BOOT Switchover Threshold
2.4
2.6
V
BOOT falling edge, typical hysteresis is 0.1V
CVH with Respect to VIN
-5.0
-4.1
V
ICVH = -1mA
CVL Regulator Output Voltage
2.7
3.15
V
VIN = 3V to 14V, BOOT = AGND,
ICVL = 0 to 5mA
Reference Output Voltage
1.236
1.266
V
IREF = 0
Oscillator Frequency
fOSC
480
700
kHz
MAX1685
240
350
MAX1684
Shutdown Supply Current
6
µA
SHDN = low
Quiescent Power Consumption
2
mW
Current Limit in Low-Power
Mode
ILIMLP
285
475
mA
STBY = low
Output Voltage (3.3V mode)
VOUT
3.295
3.375
V
PARAMETER
SYMBOL
MIN
MAX
UNITS
FB Input Current
IFB
-50
50
nA
Output Adjust Range
VREF
VIN
V
Output Current Capability
1
A
Input Voltage Range
2.7
14
V
Output Feedback Voltage
VFB
1.236
1.266
V
Current Limit in PWM Mode
ILIM
1.2
2.3
A
CONDITIONS
VFB = 1.4V
BOOT = AGND (Note 1)
VIN = 6V to 14V
FB = AGND, ILOAD = = 0 to 1A
VFB = VOUT, ILOAD = 0 to 1A
Low-power mode, STBY = low,
VBOOT = 3.3V (Note 2)


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