Datasheet

LM3420
www.ti.com SNVS116D –MAY 1998–REVISED MAY 2013
OPERATING RATINGS
(1)(2)
Ambient Temperature Range −40°C ≤ T
A
≤ +85°C
Junction Temperature Range −40°C ≤ T
J
≤ +125°C
Output Current 15 mA
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics. The specified specifications apply only for the test conditions listed. Some performance
characteristics may degrade when the device is not operated under the listed test conditions.
(2) The maximum power dissipation must be derated at elevated temperatures and is dictated by T
Jmax
(maximum junction temperature),
θ
JA
(junction to ambient thermal resistance), and T
A
(ambient temperature). The maximum allowable power dissipation at any
temperature is P
Dmax
= (T
Jmax
− T
A
)/θ
JA
or the number given in the Absolute Maximum Ratings, whichever is lower. The typical thermal
resistance (θ
JA
) when soldered to a printed circuit board is approximately 306°C/W for the DBV0005A package.
LM3420-4.2
ELECTRICAL CHARACTERISTICS
Specifications with standard type face are for T
J
= 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, V(IN) = V
REG
, V
OUT
= 1.5V.
LM3420A-4.2 LM3 Limit
(2)
Symbol Parameter Conditions Typical
(1)
Units (Limits)
Limit
(2)
420-4.2
V
REG
I
OUT
= 1 mA 4.2 V
Regulation Voltage 4.221/4.242 4.242/4.284 V(max)
4.179/4.158 4.158/4.116 V(min)
Regulation Voltage I
OUT
= 1 mA
±0.5/±1 ±1/±2 %(max)
Tolerance
I
q
I
OUT
= 1 mA 85 μA
Quiescent Current
110/115 125/150 μA(max)
G
m
20 μA ≤ I
OUT
≤ 1 mA 3.3 mA/mV
V
OUT
= 2V 1.3/0.75 1.0/0.50 mA/mV(min)
Transconductance
ΔI
OUT
/ΔV
REG
1 mA ≤ I
OUT
≤ 15 mA 6.0 mA/mV
V
OUT
= 2V 3.0/1.5 2.5/1.4 mA/mV(min)
A
V
1V ≤ V
OUT
≤ V
REG
− 1.2V (−1.3) 1000 V/V
R
L
= 200Ω
(3)
550/250 450/200 V/V(min)
Voltage Gain
ΔV
OUT
/ΔV
REG
1V ≤ V
OUT
≤ V
REG
− 1.2V (−1.3) 3500 V/V
R
L
= 2 kΩ 1500/900 1000/700 V/V(min)
V
SAT
V(IN) = V
REG
+100 mV 1.0 V
Output Saturation
(4)
I
OUT
= 15 mA 1.2/1.3 1.2/1.3 V(max)
I
L
V(IN) = V
REG
−100 mV 0.1 μA
Output Leakage
Current
V
OUT
= 0V 0.5/1.0 0.5/1.0 μA(max)
R
f
75 kΩ
Internal Feedback
94 94 kΩ(max)
Resistor
(5)
56 56 kΩ(min)
E
n
Output Noise Voltage I
OUT
= 1 mA, 10 Hz ≤ f ≤ 10 kHz 70 μV
RMS
(1) Typical numbers are at 25°C and represent the most likely parametric norm.
(2) Limits are 100% production tested at 25°C. Limits over the operating temperature range are specified through correlation using
Statistical Quality Control (SQC) methods. The limits are used to calculate Averaging Outgoing Quality Level (AOQL).
(3) Actual test is done using equivalent current sink instead of a resistor load.
(4) V
SAT
= V(IN) − V
OUT
, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (V
REG
).
(5) See Applications and Typical Performance Characteristics sections for information on this resistor.
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