Rainbow Electronics MAX5099 - Manual (Page 3)

MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
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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
m Ω
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)