XR77103 Datasheet, PDF (4/28 Pages) Exar Corporation – 3-Output Programmable Buck Regulator

XR77103
Electrical Characteristics (Continued)
T_A = 25°C, V_IN = 12V, EN = V_CC, f_SW = 1MHz, unless otherwise specified. Limits applying over the full operating temperature
range are denoted by a •.
Symbol
Parameter
Conditions
Protections
T_SD
HY_TSD
T_{SD_DEGLITCH}
Thermal shutdown temperature
Thermal shutdown hysteresis
Thermal shutdown deglitch
V_OVBUCK
Threshold voltage for buck
overvoltage
Buck Converter
Temperature rising, Non-latch off.
T_SD release threshold,
temperature = T_SD-HY_TSD
Output rising (HS FET will be
forced off)
Output falling (HS FET will be
allowed to switch)
f_SW
V_OUTx
Switching frequency
Output voltage range
Output voltage resolution
I²C control
Adjustable soft-start period range
I_LIMx
I_LIMx
R_{ON_HSx}
R_{ON_LS1}
R_{ON_LS2/3}
I_O
D_MAX
t_{ON MIN}
SYNC_RANGE
SYNC_{D_MIN}
SYNC_{D_MAX}
Peak inductor current limit range
Peak inductor current
limit accuracy
Peak inductor current limit set
at 3A
HS switch on-resistance
V_IN = 12V
LS switch on-resistance of Buck1 V_IN = 12V
LS switch on-resistance of Buck2/3 V_IN = 12V
Output current capability
Continuous loading
Maximum duty cycle
Minimum on time
Line regulation (ΔV_OX/ΔV_INX)
Load regulation (ΔV_OX/ΔI_OX)
Output voltage accuracy
Synchronization range
Synchronization signal
minimum duty cycle
Synchronization signal
maximum duty cycle
V_INX = 5.5 to 14V, I_OX = 1A
I_O = 10 to 90%, I_O = MAX
V_IN = 12V
5.5V ≤ V_IN ≤ 14V
NOTE:
1. Subject to thermal derating. Design must not exceed the package thermal rating.
• Min
Typ
160
20
110
109
107
•
0.3
•
0.8
0.05
•
0.5
•
1
•
25
•
-1
•
-2
• f_SW + 5%
•
40
200
60
80
2⁽¹⁾
95
120
0.5
0.5
Normal
Normal
•
Max
2.2
6
4
4
25
1
2
2.31
60
Units
°C
°C
µs
%
%
MHz
V
V
ms
A
%
mΩ
mΩ
mΩ
A
%
ns
%V_O
%V_O/A
%
MHz
%
%
REV1B
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