Rainbow Electronics MAX5099 - Manual (Page 4)

MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
4 _______________________________________________________________________________________
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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I SWITCH = 100mA, BST2/VDD2 to
V SOURCE2 = 5.2V
280
On-Resistance High-Side
MOSFET Converter 2
R ON2
I SWITCH = 100mA, BST2/VDD2 to
V SOURCE2 = 4.5V
300 520
m Ω
Minimum Converter 1 Output
Current
I OUT1 V OUT1 = 5V, V+ = 12V (Note 4) 2 A
Minimum Converter 2 Output
Current
I OUT2 V OUT2 = 3.3V, V+ = 12V (Note 4) 1 A
Converter 1/Converter 2
MOSFET DRAIN_ Leakage
Current
I
LK12
V EN1 = V EN2 = 0V, V DS = 19V, V DRAIN_ =
19V, V SOURCE_ = 0V
20 μA
Internal Weak Low-Side Switch
On-Resistance
R ONLSSW_ I LSSW = 30mA 22 Ω
INTERNAL SWITCH CURRENT LIMIT
Internal Switch Current-Limit
Converter 1
I CL1
V+ = V IN_HIGH = 5.2V, V L = VDRV =
V BST_ /V DD_ = 5.2V
2.8 3.45 4.3 A
Internal Switch Current-Limit
Converter 2
I CL2
V+ = V IN_HIGH = 5.2V, V L = VDRV =
V BST_ /V DD_ = 5.2V
1.75 2.10 2.60 A
SWITCHING FREQUENCY
PWM Maximum Duty Cycle D MAX SYNC = SGND, f SW = 1.25MHz 90 92 100 %
Switching Frequency Range f
SW
200 2200 kHz
Switching Frequency f SW R OSC = 6.81k Ω, each converter 1.7 1.9 2.1 MHz
5.6k Ω < R
OSC < 10k Ω, 1% 5
Switching Frequency Accuracy
10k Ω < R
OSC < 62.5k Ω, 1% 7
%
SYNC Frequency Range f SYNC
Each converter switching frequency is half
of the SYNC input frequency,
FSEL_1 = V
L
(see the Setting the
Switching Frequency section)
400 4400 kHz
SYNC High Threshold V
SYNCH
2 V
SYNC Low Threshold V SYNCL 0.8 V
SYNC Input Leakage I SYNC_LEAK 2 μA
SYNC Input Minimum Pulse
Width
t SYNCIN 100 ns
Sync to Source 1 Phase Delay SYNC
PHASE
R
OSC
= 62.5k Ω 90 Degrees