7228

NTE7228
Integrated Circuit
Fixed Multi−Output Positive Voltage Regulator
10−Lead SIP
Description:
The NTE7228 is a multi−output positive voltage regulator in a 10−Lead SIP type package designed
to provide fixed precision output voltages of 5.1V & 8V at current up to 0.5A and 12V at current up
to 1A with an external PNP transistor. An internal reset circuit generates a reset pulse when Output
1 decreases below the regulated value. Output 2 and Output 3 can be disabled by TTL input. Protection
features include over voltage protection, short circuit protection and thermal shutdown.
Features:
D Output Currents up to 0.5A (Output 1 & Output 2)
D Output Current up to 1A with External Transistor (Output 3)
D Fixed Precision Output 1 Voltage 5.1V +2%
D Fixed Precision Output 2 Voltage 8V +2%
D Control Signal Generator for Output 3 Voltage (12V +2%)
D Reset Facility for Output Voltage 1
D Output 2 and Output 3 with Disable by TTL Input
D Current Limit Protection at Each Output
D Thermal Shutdown
Absolute Maximum Ratings:
DC Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Disable Input Voltage, VC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Output Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Power Dissipation (No Heatsink), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5W
Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1505C
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 05 to +1255C
Electrical Characteristics: (VIN1 = 7.5V, VIN2 = 10.5V, TJ = +255C unless otherwise specified)
Parameter
Output Voltage 1
Output Voltage 2
Dropout Output Voltage
Line Regulation
Symbol
VO1
VO2
Test Conditions
7.5V < VIN1 < 14V
10.5V < VIN2 < 18V
Typ
Max
Unit
IO1 = 10mA
5.0
5.1
5.2
V
5mA < IO1 < 500mA
4.9
5.1
5.3
V
IO2 = 10mA
7.84
8.0
8.16
V
5mA < IO2 < 500mA
7.7
8.0
8.3
V
VD1
IO1 = 500mA
−
−
2.5
V
VD2
IO2 = 500mA
−
−
2.5
V
7.5V < VIN1 < 14V
−
−
50
mV
10.5V < VIN2 < 18V
−
−
80
mV
+VO1
IO1 = IO2 = 200mA
+VO2
Load Regulation
Min
+VO1
5mA < IO1 < 500mA
−
−
100
mV
+VO2
5mA < IO1 < 500mA
−
−
160
mV
Output Voltage 3
VO3
VSYS = 13V, IO3 = 100mA
11.7
12.0
12.3
V
Line Regulation 3
+VO3
13V < VIN2 < 18V, IO3 = 100mA
−
−
120
mV
Load Regulation 3
+VO3
5mA < IO3 < 1A
−
−
250
mV
Reset Pulse Delay
Trd
CD = 100nF, Note 1
−
25
−
ms
Saturation Voltage in Reset Condition
VrL
I6 = 5mA
−
−
0.4
V
Leakage Current at Pin6
IrH
V6 = 10V
−
−
10
5A
Output Voltage Thermal Drift
STt
05 < TJ < +1255C, Note 2
−
100
−
ppm/5C
Short Circuit Output Current
ISC1
VIN1 = 7.5V
−
−
1.6
A
ISC2
VIN2 = 10.5V
−
−
1.6
A
Disable Voltage, High
VdisH
Output 2 Active
2
−
−
V
Disable Voltage, Low
VdisL
Output 2 Disabled
−
−
0.8
V
Disable Bias Current
Idis
0V < Vdis < 7V
−100
−
2
5A
Junction Temperature for TSD
Ttsd
Note 2
−
145
−
5C
−
−
2
mA
K-0.4
K-0.25
K-0.1
V
20
50
100
mA
Quiescent Current
Iq
IO1 = 10mA, Output 2 Disabled
Reset Threshold Voltage
Vr
K = VO1
Reset Threshold Hysteresis
Vrth
Note 1
Note 1. To check the reset circuit, the reset output is low to discharge the delay capacitor (= CD). If
it’s less than VO1−0.25V. And the reset output is high when the delay capacitor voltage linearly increased by the internal current source (105 A) if it’s more than VO1 −0.2V. The equations of delay time is the same as below. Trd = (CD x 2.5) / 105 A.
Note 2. These parameters, although guaranteed, are not 100% tested in production.
Pin Connection Diagram
(Front View)
10 Output 3
9 Output 1
8 Output 2
7 Control
6 RESET
5 GND
4 Disable
3 DEL. CAP
2 VIN2
1 VIN1
.150
(3.8)
1.026 (26.05)
.128 (3.25) Dia
.065
(1.65)
.311
(7.9)
.537
(13.65)
1
10
.350
(8.9)
.276
(7.0)
.100 (2.54)
.020 (0.5)
.020
(0.5)