The LM2931 series consists of positive fixed and adjustable output
voltage regulators that are specifically designed to maintain proper
regulation with an extremely low input–to–output voltage differential. These
devices are capable of supplying output currents in excess of 100 mA and
feature a low bias current of 0.4 mA at 10 mA output.
Designed primarily to survive in the harsh automotive environment, these
devices will protect all external load circuitry from input fault conditions
caused by reverse battery connection, two battery jump starts, and
excessive line transients during load dump. This series also includes internal
current limiting, thermal shutdown, and additionally, is able to withstand
temporary power–up with mirror–image insertion.
Due to the low dropout voltage and bias current specifications, the
LM2931 series is ideally suited for battery powered industrial and consumer
equipment where an extension of useful battery life is desirable. The ‘C’
suffix adjustable output regulators feature an output inhibit pin which is
extremely useful in microprocessor–based systems.
• Input–to–Output Voltage Differential of < 0.6 V @ 100 mA
• Output Current in Excess of 100 mA
• Low Bias Current
• 60 V Load Dump Protection
• –50 V Reverse Transient Protection
• Internal Current Limiting with Thermal Shutdown
• Temporary Mirror–Image Protection
• Ideally Suited for Battery Powered Equipment
• Economical 5–Lead TO–220 Package with T wo Optional Leadforms
• Available in Surface Mount SOP–8, D
• High Accuracy (±2%) Reference (LM2931AC) Available
29TO–92 Type
751SOP–8 Surface Mount
936Surface Mount D2PAK
369ASurface Mount DPAK
369DPAK
221ATO–220 Type
29TO–92 Type
751SOP–8 Surface Mount
936ASurface Mount D2PAK
314D5–Pin TO–220 Type
314A5–Pin Horizontal Leadform
751SOP–8 Surface Mount
936ASurface Mount D2PAK
314D5–Pin TO–220 Type
Input
Output
30 k *
Adjust
92.8 k *
Ground
*Deleted on Adjustable Regulators
6.0
30 k
3.94 k
3.0 k
11.5 k
Representative Schematic Diagram
6.0 k
350
500
30 k
EPI
Bias
This device contains 26 active transistors.
50 k
30 k
Output
Inhibit
35 k
6.8 V
48 k
180 k184 k
10 k
5.8 V
2
MOTOROLA ANALOG IC DEVICE DATA
LM2931 Series
MAXIMUM RATINGS
RatingSymbolValueUnit
Input Voltage ContinuousV
I
Transient Input V oltage (τ ≤100 ms)VI(τ)60Vpk
Transient Reverse Polarity Input V oltage–VI(τ)–50–Vpk
1.0% Duty Cycle, τ ≤ 100 ms
Power Dissipation
Case 29 (TO–92 Type)
TA = 25°CP
Thermal Resistance, Junction–to–AmbientR
Thermal Resistance, Junction–to–CaseR
D
θJA
θJC
Case 221A, 314A, 314B and 314D (TO–220 T ype)
TA = 25°CP
Thermal Resistance, Junction–to–AmbientR
Thermal Resistance, Junction–to–CaseR
D
θJA
θJC
Case 369 and 369A (DPAK) [Note 1]
TA = 25°CP
Thermal Resistance, Junction–to–AmbientR
Thermal Resistance, Junction–to–CaseR
D
θJA
θJC
Case 751 (SOP–8) [Note 2]
TA = 25°CP
Thermal Resistance, Junction–to–AmbientR
Thermal Resistance, Junction–to–CaseR
D
θJA
θJC
Case 936 and 936A (D2PAK) [Note 3]
TA = 25°CP
Thermal Resistance, Junction–to–AmbientR
Thermal Resistance, Junction–to–CaseR
Tested Operating Junction Temperature RangeT
Storage Temperature RangeT
NOTES: 1. DPAK Junction–to–Ambient Thermal Resistance is for vertical mounting. Refer to Figure 24 for
board mounted Thermal Resistance.
2.SOP–8 Junction–to–Ambient Thermal Resistance is for minimum recommended pad size. Refer
to Figure 23 for Thermal Resistance variation versus pad size.
3.D2PAK Junction–to–Ambient Thermal Resistance is for vertical mounting. Refer to Figure 25 for
board mounted Thermal Resistance.
4.ESD data available upon request.
D
θJA
θJC
J
stg
40Vdc
Internally LimitedW
178°C/W
83°C/W
Internally LimitedW
65°C/W
5.0°C/W
Internally LimitedW
92°C/W
6.0°C/W
Internally LimitedW
160°C/W
25°C/W
Internally LimitedW
70°C/W
5.0°C/W
–40 to +125°C
–65 to +150°C
ELECTRICAL CHARACTERISTICS (V
= 14 V, IO = 10 mA, CO = 100 µF, C
in
= 0.3 Ω, TJ = 25°C [Note 1].)
O(ESR)
LM2931–5.0LM2931A–5.0
CharacteristicSymbol
MinTypMaxMinTypMax
Unit
FIXED OUTPUT
Output VoltageV
O
V
Vin = 14 V, IO = 10 mA, TJ = 25°C4.755.05.254.815.05.19
Vin = 6.0 V to 26 V, IO ≤ 100 mA, TJ = –40° to +125°C4.50–5.504.75–5.25
Line RegulationReg
line
mV
Vin = 9.0 V to 16 V–2.010–2.010
Vin = 6.0 V to 26 V–4.030–4.030
Load Regulation (IO = 5.0 mA to 100 mA)Reg
Output ImpedanceZ
load
O
–1450–1450mV
mΩ
IO = 10 mA, ∆IO = 1.0 mA, f = 100 Hz to 10 kHz–200––200–
Bias CurrentI
B
mA
Vin = 14 V, IO = 100 mA, TJ = 25°C–5.830–5.830
Vin = 6.0 V to 26 V, IO = 10 mA, TJ = –40° to +125°C–0.41.0–0.41.0
Output Noise Voltage (f = 10 Hz to 100 kHz)V
n
–700––700–µVrms
Long Term StabilityS–20––20–mV/kHR
NOTES: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
2.The reference voltage on the adjustable device is measured from the output to the adjust pin across R1.