Datasheet

LM21215
SNVS625E –FEBRUARY 2011–REVISED MARCH 2013 www.ti.com
Electrical Characteristics
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
V
FB
Feedback pin voltage V
IN
= 2.95V to 5.5V -1% 0.6 1% V
ΔV
OUT
/ΔI
OUT
Load Regulation 0.02 %V
OUT
/A
ΔV
OUT
/ΔV
IN
Line Regulation 0.1 %V
OUT
/V
R
DSON HS
High Side Switch On Resistance I
SW
= 12A 7 9.0 mΩ
R
DSON LS
Low Side Switch On Resistance I
SW
= 12A 4.3 6.0 mΩ
I
CLR
HS Rising Switch Current Limit R
ILIM
= 16.5 kΩ 16.5 20 23.5 A
R
ILIM
= 41.3 kΩ 8.5 10 11.5
R
ILIM
= 130 kΩ 3.8
I
CLF
LS Falling Switch Current Limit R
ILIM
= 16.5 kΩ 14.5 A
R
ILIM
= 41.3 kΩ 7.5
R
ILIM
= 130 kΩ 3
V
ZX
Zero Cross Voltage -8 3 12 mV
I
Q
Operating Quiescent Current 1.5 3 mA
I
SD
Shutdown Quiescent Current V
EN
= 0V 50 70 µA
V
UVLO
AVIN Under Voltage Lockout AVIN Rising 2.45 2.7 2.95 V
V
UVLOHYS
AVIN Under Voltage Lockout Hysteresis 140 200 280 mV
V
TRACKOS
SS/TRACK PIN accuracy (V
SS
- V
FB
) 0 < V
TRACK
< 0.55V -10 6 20 mV
I
SS
Soft-Start Pin Source Current 1.3 1.9 2.5 µA
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
OSC
Switching Frequency 475 500 525 kHz
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
ΔV
RAMP
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 15 µs
Duration to PGOOD Falling)
t
PGDGH
PGOOD Deglitch High (minimum low pulse) 12 µs
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