Order this document by LM2935/D
Low Dropout
Dual Voltage Regulator
The LM2935 is a dual positive 5.0 V low dropout voltage regulator,
designed for standby power systems. The main output is capable of
supplying 750 mA for microprocessor power, and can be turned “on” and
“off” by the switch/reset input. The other output is dedicated for standby
operation of volatile memory, and is capable of supplying up to 10 mA loads.
The total device features a low quiescent current of 3.0 mA or less when
supplying 10 mA from the standby output.
This part was designed for harsh automotive environments and is
therefore immune to many input supply voltage problems such as reverse
battery (–12 V), double battery (+24 V), and load dump transients (+60 V).
•
Two Regulated 5.0 V Outputs
LM2935
LOW DROPOUT
DUAL VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
•
•
•
•
•
•
•
•
Main Output Current in Excess of 750 mA
On/Off Control of Main Output
Standby Output Current in Excess of 10 mA
Low Input/Output Differential of Less than 0.6 V at 500 mA
Short Circuit Current Limiting
Internal Thermal Shutdown
Low Voltage Indicator Output
Designed for Automotive Environment Including
•
Reverse Battery Protection
•
Double Battery Protection
•
Load Dump Protection
•
Reverse Transient Protection
Economical 5–Lead TO–220 Package with Two Optional Leadforms
Also Available in Surface Mount D2PAK Package
TH SUFFIX
PLASTIC PACKAGE
CASE 314A
1
5
1
5
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
•
•
Heatsink surface connected to Pin 3.
T SUFFIX
PLASTIC PACKAGE
CASE 314D
1
5
ORDERING INFORMATION
Device
LM2935D2T
LM2935T
LM2935TH
LM2935TV
40°
125°C
TJ = –40° to +125°C
Operating
Temperature Range
Package
Surface Mount
Plastic Power
Horizontal Mount
Vertical Mount
1
Pin 1. Input Voltage/VCC
2. Main Output
3. Ground
4. Switch/Reset
5. Standby/Output
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
5
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
©
Motorola, Inc. 1996
Rev 1
MOTOROLA ANALOG IC DEVICE DATA
1
LM2935
Typical Application Circuit
Main
Output
1
S1*
*The main output
is “Off” with switch
S1 open.
0.1
LM2935
20 k
Standby
Switch/
Reset
4
3
Gnd
5
+
10
5.0 V/10 mA
2
+
10
5.0 V/750 mA
Input
Vin
An input bypass capacitor is recommended if the regulator is located more than 4″ from the supply
input filter. The LM2935 is not internally compensated and thus requires an external output capacitor
for stability. A minimum capacitance of 10
µF
is recommended. The actual capacitance value is
dependent upon load current, temperature, and the capacitor’s equivalent series resistance (ESR).
The least stable condition is encountered at maximum load current and minimum ambient
temperature.
This device contains 29 active transistors.
MAXIMUM RATINGS
Rating
Input Voltage Continuous
Transient Reverse Polarity Input Voltage
1.0% Duty Cycle,
τ ≤
100 ms
Switch/Reset Input Current
Power Dissipation
Case 314A, 314B and 314D (TO–220 Type)
TA = 25°C
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Case 936A (D2PAK)
TA = 25°C
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Operating Junction Temperature Range
Storage Temperature Range
Symbol
VI
–VI(τ)
Iin
Value
60
– 50
5.0
Unit
Vdc
Vpk
mA
PD
R
θJA
R
θJC
PD
R
θJA
R
θJC
TJ
Tstg
Internally Limited
65
5.0
Internally Limited
Per Figure 1
5.0
– 40 to +150
– 65 to +150
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
ELECTRICAL CHARACTERISTICS
(Vin = 14 V, IO = 500 mA, Istby = 0 mA, CO = 10
µF,
Cstby = 10
µF,
TJ = 25°C [Note 1].)
Characteristic
MAIN OUTPUT
Output Voltage (Vin = 6.0 V to 26 V, IO = 5.0 mA to 500 mA, TJ = – 40 to +125°C)
Line Regulation
Vin = 9.0 V to 16 V, IO = 5.0 mA
Vin = 6.0 V to 26 V, IO = 5.0 mA
Load Regulation (IO = 5.0 mA to 500 mA)
Output Impedance
IO = 500 mAdc and 10 mArms, f = 100 Hz to 10 kHz
Output Noise Voltage (f = 10 Hz to 100 kHz)
Long Term Stability
VO
Regline
–
–
Regload
ZO
–
Vn
S
–
–
200
100
20
–
–
–
µVrms
mV/kHR
–
4.0
10
10
25
50
50
mV
mΩ
4.75
5.0
5.25
V
mV
Symbol
Min
Typ
Max
Unit
2
MOTOROLA ANALOG IC DEVICE DATA
LM2935
ELECTRICAL CHARACTERISTICS
(Vin = 14 V, IO = 500 mA, Istby = 0 mA, CO = 10
µF,
Cstby = 10
µF,
TJ = 25°C [Note 1].)
Characteristic
MAIN OUTPUT (continued)
Ripple Rejection (f = 120 Hz)
Dropout Voltage
IO = 500 mA
IO = 750 mA
Short Circuit Current Limit
Over–Voltage Shutdown Threshold
SWITCH/RESET
Output Sink Current (VOL = 1.2 V)
Output Voltage (Ron/off = 20 kΩ)
Low State, Vin = 4.0 V
High State, Vin = 14 V
Output Pull–Up Resistor, “On”/“Off” (Note 2)
Output Voltage with Reverse Polarity Input (Vin = –15 V, RL = 10
Ω)
ISink
VOL
VOH
Ron/off
–VO
–
–
4.5
–
– 0.6
5.0
0.9
5.0
20
0
–
1.2
6.0
30
–
kΩ
V
mA
V
RR
VI–VO
–
–
ISC
Vth(OV)
0.75
26
0.45
0.82
1.2
31
0.6
–
–
–
A
V
–
66
–
dB
V
Symbol
Min
Typ
Max
Unit
ELECTRICAL CHARACTERISTICS
(Vin = 14 V, IO = 0 mA, Istby = 10 mA, CO = 10
µF,
Cstby = 10
µF,
TJ = 25°C [Note 1].)
Characteristic
STANDBY OUTPUT
Output Voltage (Vin = 6.0 V to 26 V, Istby = 1.0 mA to 10 mA, TJ = –40 to +125°C)
Tracking Voltage
Line Regulation (Vin = 6.0 V to 26 V)
Load Regulation (Istby = 1.0 mA to 10 mA)
Output Impedance
I(stby) = 10 mAdc and 1.0 mArms, f = 100 Hz to 10 kHz
Output Noise Voltage (f = 10 Hz to 100 kHz)
Long Term Stability
Ripple Rejection (f = 120 Hz)
Dropout Voltage (Istby = 10 mA)
Short Circuit Current Limit
Output Voltage with Reverse Polarity Input
Vin = –15 V, RL = 510
Ω
Output Voltage with Maximum Positive Input
Vin = 60 V, RL = 510
Ω
TOTAL DEVICE
Bias Current
IO = 10 mA, Istby = 0 mA
IO = 500 mA, Istby = 0 mA
IO = 750 mA, Istby = 0 mA
Main Output “Off”, Istby = 10 mA
IB
–
–
–
–
3.0
40
90
2.0
–
100
–
3.0
mA
VO(stby)
VO–VO(stby)
Regline
Regload
ZO(stby)
–
Vn
S
RR
VI–VO(stby)
ISC
–VO
– 0.3
VO(max)
–
5.0
6.0
0
–
V
–
–
–
–
25
1.0
300
20
66
0.55
70
–
–
–
–
0.7
–
µVrms
mV/kHR
dB
V
mA
V
4.75
– 200
–
–
5.0
0
4.0
10
5.25
200
50
50
V
mV
mV
mV
Ω
Symbol
Min
Typ
Max
Unit
NOTES:
1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
2. The maximum switch/reset current must not exceed 5.0 mA.
MOTOROLA ANALOG IC DEVICE DATA
3
LM2935
TYPICAL CIRCUIT WAVEFORMS
60 V
Vin, Input Voltage
(Pin 1)
S1, “On”/“Off” Switch
Open
5.0 V
VO, Main Output Voltage
(Pin 2)
5.0 V
Reset (Pin 4)
Vstby, Standby Voltage
(Pin 5)
0V
5.0 V
Main
Output
Turn “On”
Load
Dump
2.4 V
Low Input
Voltage
Input
Voltage
Line Noise
5.0 V
Main
Output
Short
Circuit
Main
Output
Turn “Off”
Thermal
Shutdown
5.0 V
2.4 V
14 V
14 V
3.0 V
9.0 V
Closed
5.0 V
0V
5.0 V
5.0 V
Open
26 V
14 V
Figure 1. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
PD(max) for TA = 50°C
70
60
50
40
R
θJA
30
0
5.0
10
15
20
Free Air
Mounted
Vertically
3.0
2.0 oz. Copper
L
2.5
2.0
1.5
1.0
PD, MAXIMUM POWER DISSIPATION (W)
80
R
θ
JA, THERMAL RESISTANCE
JUNCTION–TO–AIR (
°
C/W)
3.5
Minimum
Size Pad
L, LENGTH OF COPPER (mm)
4
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
L
25
30
MOTOROLA ANALOG IC DEVICE DATA
LM2935
OUTLINE DIMENSIONS
TH SUFFIX
PLASTIC PACKAGE
CASE 314A–03
ISSUE D
–P–
B
Q
OPTIONAL
CHAMFER
–T–
C
E
SEATING
PLANE
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION D DOES NOT INCLUDE
INTERCONNECT BAR (DAMBAR) PROTRUSION.
DIMENSION D INCLUDING PROTRUSION SHALL
NOT EXCEED 0.043 (1.092) MAXIMUM.
INCHES
MIN
MAX
0.572
0.613
0.390
0.415
0.170
0.180
0.025
0.038
0.048
0.055
0.570
0.585
0.067 BSC
0.015
0.025
0.730
0.745
0.320
0.365
0.140
0.153
0.210
0.260
0.468
0.505
MILLIMETERS
MIN
MAX
14.529 15.570
9.906 10.541
4.318
4.572
0.635
0.965
1.219
1.397
14.478 14.859
1.702 BSC
0.381
0.635
18.542 18.923
8.128
9.271
3.556
3.886
5.334
6.604
11.888 12.827
U
1 2 3 4 5
A
L
F
K
G
D
5 PL
0.014 (0.356)
M
T P
M
J
5 PL
S
DIM
A
B
C
D
E
F
G
J
K
L
Q
S
U
TV SUFFIX
PLASTIC PACKAGE
CASE 314B–05
ISSUE J
Q
B
–P–
C
OPTIONAL
CHAMFER
E
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION D DOES NOT INCLUDE
INTERCONNECT BAR (DAMBAR) PROTRUSION.
DIMENSION D INCLUDING PROTRUSION SHALL
NOT EXCEED 0.043 (1.092) MAXIMUM.
INCHES
MIN
MAX
0.572 0.613
0.390 0.415
0.170 0.180
0.025 0.038
0.048 0.055
0.850 0.935
0.067 BSC
0.166 BSC
0.015 0.025
0.900 1.100
0.320 0.365
0.320 BSC
0.140 0.153
0.620
–
0.468 0.505
0.735
–
0.090 0.110
MILLIMETERS
MIN
MAX
14.529 15.570
9.906 10.541
4.318 4.572
0.635 0.965
1.219 1.397
21.590 23.749
1.702 BSC
4.216 BSC
0.381 0.635
22.860 27.940
8.128 9.271
8.128 BSC
3.556 3.886
– 15.748
11.888 12.827
– 18.669
2.286 2.794
U
K
F
1 2 3 4 5
A
S
L
W
V
DIM
A
B
C
D
E
F
G
H
J
K
L
N
Q
S
U
V
W
G
D
5 PL
0.10 (0.254)
M
0.24 (0.610)
J
5 PL
M
T
N
H
T P
M
–T–
SEATING
PLANE
MOTOROLA ANALOG IC DEVICE DATA
5
京公网安备 11010802033920号
EEWORLD
