Owner manual

MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Rising, ON/OFF = IN_HIGH, GATE rising 3.6 4.1
IN_HIGH Startup Voltage
IN_HIGH
UVLO
Falling, ON/OFF = IN_HIGH, GATE falling 3.45
V
GATE Charge Current I
GATE_CH
V
IN_HIGH
= V
ON/OFF
= 14V,
V
GATE
= V+ = 0V
20 45 80 μA
V+ = V
IN_HIGH
= V
ON/OFF
= 4.5V,
I
GATE
= 1μA
4.0 5.3 7.5
GATE Output Voltage
V
GATE
-
V
IN_HIGH
V+ = V
IN_HIGH
= V
ON/OFF
= 14V,
I
GATE
= 1μA
9
V
GATE Turn-Off Pulldown
Current
I
GATE_PD
V
IN_HIGH
= 14V, V
ON/OFF
= 0V, V+ = 0V,
V
GATE
= 5V
3.6 mA
STARTUP/V
L
REGULATOR
V
L
Undervoltage-Lockout Trip
Level
UVLO V
L
falling 3.9 4.1 4.3 V
V
L
Undervoltage-Lockout
Hysteresis
180 mV
V
L
Output Voltage V
L
I
SOURCE_
= 0 to 40mA, 5.5V ≤ V+ ≤ 19V 5.0 5.2 5.5 V
V
L
LDO Short-Circuit Current I
VL_SHORT
V+ = V
IN_HIGH
= 5.2V 130 mA
V
L
LDO Dropout Voltage V
LDO
I
SOURCE_
= 40mA, V+ = V
IN_HIGH
= 4.5V 300 550 mV
BYPASS OUTPUT
BYPASS Voltage V
BYPASS
I
BYPASS
= 0μA 1.98 2.00 2.02 V
BYPASS Load Regulation ΔV
BYPASS
0 < I
BYPASS
< 100μA (sourcing) 2 5 mV
SOFT-START/SOFT-STOP
Digital Ramp Period Soft-
Start/Soft-Stop
Internal 6-bit DAC 2048
f
SW
Clock
Cycles
Soft-Start/Soft-Stop Steps 64 Steps
VOLTAGE-ERROR AMPLIFIER
FB_ Input Bias Current I
FB_
250 nA
-40°C ≤ T
A
≤ +85°C 0.783 0.8 0.809
FB_ Input-Voltage Set Point V
FB_
-40°C ≤ T
A
≤ +125°C 0.785 0.814
V
FB_ to COMP_
Transconductance
g
M
1.4 2.4 3.4 mS
INTERNAL MOSFETS
I
SWITCH
= 100mA, BST1/VDD1 to
V
SOURCE1
= 5.2V
195
On-Resistance High-Side
MOSFET Converter 1
R
ON1
I
SWITCH
= 100mA, BST1/VDD1 to
V
SOURCE1
= 4.5V
208 355
mΩ
ELECTRICAL CHARACTERISTICS (continued)
(VDRV = V
L
, V+ = V
L
= IN_HIGH = 5.2V or V+ = IN_HIGH = 5.2V to 19V, EN_ = V
L
, SYNC = GND, I
VL
= 0mA, PGND = SGND,
C
BYPASS
= 0.22μF (low ESR), C
VL
= 4.7μF (ceramic), C
V+
= 1μF (low ESR), C
IN_HIGH
= 1μF (ceramic), R
IN_HIGH
= 3.9kΩ, R
OSC
= 10kΩ,
T
J
= -40°C to +125°C, unless otherwise noted.) (Note 2)