Datasheet
LM21215A
www.ti.com
SNOSB87B –MARCH 2011–REVISED MARCH 2013
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, the following conditions apply: V
PVIN, AVIN
= 5V. Limits in standard type are for T
J
= 25°C only, limits
in bold face type apply over the junction temperature (T
J
) range of −40°C to +125°C. Minimum and maximum limits are
specified 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.
Symbol Parameter Conditions Min Typ Max Units
SYSTEM
t
INTSS
Internal Soft-Start Ramp to Vref C
SS
= 0 350 500 675 µs
t
RESETSS
Device Reset to Soft-Start Ramp 50 110 200 µs
OSCILLATOR
f
SYNCR
SYNC Frequency Range 300 1500 kHz
f
DEFAULT
Default (no SYNC signal) Frequency 475 500 525 kHz
t
SY_SW
Time from SYNC falling to V
SW
Rising 200 ns
t
SY_MIN
Minimum SYNC pin pulse width, high or low 100 ns
t
HSBLANK
HS OCP Blanking Time Rising edge of SW to I
CLR
55 ns
comparison
t
LSBLANK
LS OCP Blanking Time Falling edge of SW to I
CLF
400 ns
comparison
t
ZXBLANK
Zero Cross Blanking Time Falling edge of SW to V
ZX
120 ns
comparison
t
MINON
Minimum HS on-time 140 ns
ΔVramp PWM Ramp p-p Voltage 0.8 V
ERROR AMPLIFIER
V
OL
Error Amplifier Open Loop Voltage Gain ICOMP = -65µA to 1mA 95 dBV/V
GBW Error Amplifier Gain-Bandwidth Product 11 MHz
I
FB
Feedback Pin Bias Current V
FB
= 0.6V 1 nA
I
COMPSRC
COMP Output Source Current 1 mA
I
COMPSINK
COMP Output Sink Current 65 µA
POWERGOOD
V
OVP
Over Voltage Protection Rising Threshold V
FB
Rising 105 112.5 120 %V
FB
V
OVPHYS
Over Voltage Protection Hysteresis V
FB
Falling 2 %V
FB
V
UVP
Under Voltage Protection Rising Threshold V
FB
Rising 82 90 97 %V
FB
V
UVPHYS
Under Voltage Protection Hysteresis V
FB
Falling 2.5 %V
FB
t
PGDGL
PGOOD Deglitch Low (OVP/UVP Condition Duration 15 µs
to PGOOD Falling)
t
PGDGH
PGOOD Deglitch High (minimum low pulse) 12 µs
R
PGOOD
PGOOD Pull-down Resistance 10 20 40 Ω
I
PGOODLEAK
PGOOD Leakage Current V
PGOOD
= 5V 1 nA
LOGIC
V
IHSYNC
SYNC Pin Logic High 2.0 V
V
ILSYNC
SYNC Pin Logic Low 0.8 V
V
IHENR
EN Pin Rising Threshold V
EN
Rising 1.20 1.35 1.45 V
V
ENHYS
EN Pin Hysteresis 50 110 180 mV
I
EN
EN Pin Pullup Current V
EN
= 0V 2 µA
THERMAL SHUTDOWN
T
THERMSD
Thermal Shutdown 165 °C
T
THERMSDHYS
Thermal Shutdown Hysteresis 10 °C
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