MAX15014_07 Datasheet, PDF (4/26 Pages) Maxim Integrated Products – 1A, 4.5V to 40V Input Buck Converters with 50mA Auxiliary LDO Regulators

1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V_{IN_SW} = V_{IN_LDO} = V_DRAIN = 14V, V_{EN_SYS} = V_{EN_SW} = 2.4V, V_REG = V_DVREG, V_SYNC = V_{SET_LDO} = V_SGND = V_PGND = 0V, C_REG =
1µF, C_{IN_SW} = 0.1µF, C_{IN_LDO} = 0.1µF, C_{LDO_OUT} = 10µF, C_DRAIN = 0.22µF, T_A = T_J = -40°C to +125°C, unless otherwise noted.
Typical values are at T_A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYNC Frequency Range
f_SYNC
MAX15014/MAX15016
MAX15015/MAX15017
100
200
kHz
400
600
Ramp Level Shift (Valley)
0.3
V
ERROR AMPLIFER
Soft-Start Reference Voltage
V_SS
1.210 1.235 1.260
V
Soft-Start Current
FB Regulation Voltage
FB Input Range
I_SS
V_SS = 0V
V_FB
V_FB
7
12
17
µA
1.210 1.235 1.260
V
0
1.5
V
FB Input Current
COMP Voltage Range
I_FB
V_FB = 1.244V
I_COMP = -500µA to +500µA
-250
0.25
+250
nA
4.5
V
Open-Loop Gain
80
dB
Unity-Gain Bandwidth
1.8
MHz
PWM Modulator Gain
f_SYNC = 500kHz, MAX15015/MAX15017
10
V/V
f_SYNC = 135kHz, MAX15014/MAX15016
10
CURRENT-LIMIT COMPARATOR
Pulse Skip Threshold
IPFM
100 200 300
mA
Cycle-by-Cycle Current Limit
I_ILIM
1.3
2
2.6
A
Number of Consecutive ILIM
Events to Hiccup
7
—
Hiccup Timeout
512
Clock
periods
POWER SWITCH
Switch On-Resistance
Switch Gate Charge
Switch Leakage Current
BST Quiescent Current
V_BST - V_LX = 6V
0.15 0.4 0.80
Ω
V_BST - V_LX = 6V
4
nC
V_{IN_SW} = V_{IN_LDO} = V_LX = V_DRAIN =
40V, V_FB = 0V
10
µA
V_BST = 40V, V_DRAIN = 40V, V_FB = 0V,
DVREG = 5V
400 600
µA
BST Leakage Current
V_BST = V_DRAIN = V_LX = V_{IN_SW} =
V_{IN_LDO} = 40V, EN_SW = 0V
CHARGE PUMP (MAX15015/MAX15016)
C- Output Voltage Low
Sinking 10mA
C- Output Voltage High
Relative to DVREG, sourcing 10mA
DVREG to C+ On-Resistance
Sourcing 10mA
LX to PGND On-Resistance
Sinking 10mA
LDO
Input Voltage Range
V_{IN_LDO}
Undervoltage Lockout Threshold UVLO_LDO_TH V_{IN_LDO} rising
Undervoltage Lockout Hysteresis UVLO_LDO_HYST
1
µA
0.1
V
0.1
V
10
Ω
12
Ω
5
40
V
3.90 4.1 4.25
V
0.3
V
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