Electrical characteristics (continued) – Rainbow Electronics MAX799 User Manual
Page 4
MAX796/MAX797/MAX799
Step-Down Controllers with
Synchronous Rectifier for CPU Power
4
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ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, GND = PGND = 0V, IVL = IREF = 0A, T
A
= -40°C to +85°C for MAX79_E, unless otherwise noted.) (Note 3)
Note 3:
All -40°C to +85°C specifications above are guaranteed by design.
External resistor divider
0mV < (CSH - CSL) < 80mV, FB = VL, 4.5V < V+ < 30V,
includes line and load regulation
0mV < (CSH - CSL) < 80mV, FB = VL, 6V < V+ < 30V,
includes line and load regulation
CONDITIONS
V
REF
6.0
Nominal Adjustable Output
Voltage Range
V
3.10
3.35
3.56
3.3V Output Voltage (CSL)
V
5.0
30
Input Supply Range
V
4.70
5.10
5.40
5V Output Voltage (CSL)
UNITS
MIN
TYP
MAX
PARAMETER
CSH - CSL, negative
(CSH-CSL) = 0V
6V < V+ < 30V
CSH - CSL, positive
-40
-100
-160
Current-Limit Voltage
V
2.40
2.60
Feedback Voltage
%/V
0.04
0.06
Line Regulation
mV
70
130
FB = CSH = CSL = 6V, VL switched over to CSL
SHDN = 0V, V+ = 30V, CSL = 0V or 6V
Rising edge, hysteresis = 25mV
No external load (Note 1)
0µA < I
REF
< 100µA
µA
1
10
V+ Off-State Leakage Current
µA
1
10
V+ Shutdown Current
V
Rising edge, hysteresis = 15mV
SHDN = 2V, 0mA < I
VL
< 25mA, 5.5V < V+ < 30V
4.2
4.7
VL/CSL Switchover Voltage
V
2.43
2.505
2.57
Reference Output Voltage
Falling edge, hysteresis = 15mV (MAX796)
Falling edge, hysteresis = 20mV (MAX799)
mV
50
Reference Load Regulation
V
3.75
4.05
VL Fault Lockout Voltage
V
4.7
5.3
VL Output Voltage
2.40
2.60
V
-0.08
0.08
SECFB Regulation Setpoint
SYNC = REF
SYNC = 0V or 5V
89
91
kHz
210
320
Oscillator Sync Range
kHz
SYNC = REF
120
150
180
Oscillator Frequency
ns
250
SYNC High Pulse Width
ns
250
SYNC Low Pulse Width
250
300
350
mW
4.8
8.4
Quiescent Power Consumption
High or low, BST - LX = 4.5V
High or low
SYNC = 0V or 5V
Ω
7
DH On-Resistance
Ω
7
DL On-Resistance
%
93
96
Maximum Duty Cycle
+3.3V and +5V STEP-DOWN CONTROLLERS
FLYBACK/PWM CONTROLLER
INTERNAL REGULATOR AND REFERENCE
OSCILLATOR AND INPUTS/OUTPUTS