LM2991QML Datasheet, PDF (1/13 Pages) National Semiconductor (TI) – Negative Low Dropout Adjustable Regulator

March 2006
LM2991QML
Negative Low Dropout Adjustable Regulator
General Description
The LM2991 is a low dropout adjustable negative regulator
with a output voltage range between −2V to −25V. The
LM2991 provides up to 1A of load current and features a On
/Off pin for remote shutdown capability.
The LM2991 uses new circuit design techniques to provide a
low dropout voltage, low quiescent current and low tempera-
ture coefficient precision reference. The dropout voltage at
1A load current is typically 0.6V and a guaranteed worst-
case maximum of 1V over the entire operating temperature
range. The quiescent current is typically 1 mA with a 1A load
current and an input-output voltage differential greater than
3V. A unique circuit design of the internal bias supply limits
the quiescent current to only 9 mA (typical) when the regu-
lator is in the dropout mode (V_O − V_I ≤ 3V).
The LM2991 is short-circuit proof, and thermal shutdown
includes hysteresis to enhance the reliability of the device
when inadvertently overloaded for extended periods.
Features
n Output voltage adjustable from −2V to −25V
n Output current in excess of 1A
n Dropout voltage typically 0.6V at 1A load
n Low quiescent current
n Internal short circuit current limit
n Internal thermal shutdown with hysteresis
n TTL, CMOS compatible ON/OFF switch
n Functional complement to the LM2941 series
Applications
n Post switcher regulator
n Local, on-card, regulation
n Battery operated equipment
Ordering Information
NS Part Number
LM2991J-QML
LM2991J-QMLV
LM2991WG-QML
SMD Part Number
5962-9650501QEA
5962-9650501VEA
5962-9650501QXA
Connection Diagrams
16-Lead Ceramic Dual-in-Line Package
NS Package Number
J16A
J16A
WG16A
Package Description
16LD Ceramic Dip
16LD Ceramic Dip
16LD Ceramic SOIC
16-Lead Ceramic Surface-Mount Package
20158729
Top View
See NS Package Number J16A
20158730
Top View
See NS Package Number WG16A
© 2006 National Semiconductor Corporation DS201587
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