Datasheet

LM5066
SNVS655G –JUNE 2011–REVISED FEBRUARY 2013 www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature (T
J
) range of -40°C
to +125°C unless otherwise stated. Minimum and Maximum limits are ensured through test, design, or statistical correlation.
Typical values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only. Unless
otherwise stated the following conditions apply: VIN = 48V. See
(1)
and
(2)
.
Symbol Parameter Conditions Min Typ Max Units
V
GATEZ
Reverse-bias voltage of GATE to OUT GATE - OUT 15 16.5 18 V
zener diode
V
GATECP
Peak charge pump voltage in normal GATE - OUT 13.6 V
operation (V
IN
= V
OUT
)
OUT Pin
I
OUT-EN
OUT bias current, enabled OUT = VIN, Normal operation 78 µA
I
OUT-DIS
OUT bias current, disabled
(3)
Disabled, OUT = 0V, SENSE = VIN -50 µA
Current Limit
V
CL
Current limit threshold voltage CL = VDD 23 26 29 mV
(V
IN
-V
SENSE
)
CL = GND 47 50 53
t
CL
Response time VIN-SENSE stepped from 0 mV to 80 mV 45 µs
I
SENSE
SENSE input current Enabled, SENSE = OUT 25 µA
Disabled, OUT = 0V 66
Enabled, OUT = 0V 220
Circuit Breaker
RT
CB
Circuit Breaker to Current Limit Ratio: CB/CL ratio bit = 0, ILim = 50 mV 1.64 1.94 2.23 V/V
(V
IN
-V
SENSE
)
CB
/V
CL
CB/CL ratio bit = 1, ILim = 50 mV 3.28 3.87 4.45
CB/CL ratio bit = 0, ILim = 26 mV 1.88
CB/CL ratio bit = 1, ILim = 26 mV 3.75
V
CB
Circuit Breaker Threshold Voltage: CB/CL ratio bit = 0, ILim = 50 mV 80 96 110 mV
(V
IN
- V
SENSE
)
CB/CL ratio bit = 1, ILim = 50 mV 164 193 222
CB/CL ratio bit = 0, ILim = 26 mV 39 48 57
CB/CL ratio bit = 1, ILim = 26 mV 79 96 113
t
CB
Response time VIN - SENSE stepped from 0 mV to 150 0.42 0.83 µs
mV, time to GATE low, no load
Timer (TIMER pin)
V
TMRH
Upper threshold 3.74 3.9 4.07 V
V
TMRL
Lower threshold Restart cycles 0.98 1.1 1.24 V
End of 8
th
cycle 0.3 V
Re-enable Threshold 0.3 V
I
TIMER
Insertion time current TIMER pin = 2V -5.9 -4.8 -3.3 µA
Sink current, end of insertion time 1.0 1.5 2.0 mA
Fault detection current -95 -75 -50 µA
Fault sink current 1.7 2.5 3.2 µA
DC
FAULT
Fault Restart Duty Cycle 0.5 %
t
FAULT_DELAY
Fault to GATE low delay TIMER pin reaches the upper threshold 12 µs
Internal Reference
V
REF
Reference Voltage 2.93 2.97 3.02 V
ADC and MUX
Resolution 12 Bits
INL Integral Non-Linearity ADC only ±4 LSB
t
ACQUIRE
Acquisition + Conversion Time Any Channel 100 µs
t
RR
Acquisition Round Robin Time Cycle all channels 1 ms
(3) OUT bias current (disabled) due to leakage current through an internal 1 MΩ resistance from SENSE to VOUT.
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