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NTE7173
NTE7173SM
Integrated Circuit
1.5A Step−Up/Down Inverting
Switching Regulator
Description:
The NTE7173 and NTE 7173SM are monolithic circuits containing the primary functions required for
DC−to−DC converters. These devices consist of an internal temperature compensated reference,
comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current
output switch. This series was specifically designed to be incorporated in Step−Down and Step−Up
and Voltage−Inverting applications with a minimum number of external components.
Features:
D Operation from 3V to 40V Input
D Low Standby Current
D Output Switch Current 1.5A
D Output Voltage Adjustable
D Frequency Operation to 100kHz
D Precision 2% Reference
Absolute Maximum Ratings:
Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Vdc
Comparator Input Voltage Range, VIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 to +40Vdc
Switch Collector Voltage, VC(switch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Vdc
Switch Emitter Voltage (VPin1), VE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Vdc
Switch Collector−to−Emitter Voltage, VCE(switch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Vdc
Driver Collector Voltage, VC(driver) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Vdc
Driver Collector Current (Note1), IC(driver) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Switch Current, ISW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Power Dissipation (TA = +25°C), PD
NTE7173 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25W
NTE7173SM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW
Thermal Resistance, Junction−to−Ambient, RthJA
NTE7173 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +100°C/W
NTE7173SM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +160°C/W
Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C
Note 1. Maximum package power dissipation limits must be observed.

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Electrical Characteristics: (VCC = 5V, TA = 0°C to +70°C, unless otherwise specified)
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Symbol
Test Conditions
Min Typ Max
Oscillator
Frequency
Charge Current
Discharge Current
Discharge to Charge Current Ratio
Current Limit Sense Voltage
Output Switch (Note 2)
fOSC
lchg
ldischg
ldischg/lchg
Vipk(sense)
VPin5 = 0V, CT = 1.0nF, TA = +25°C
VCC = 5V to 40V, TA = +25°C
VCC = 5.0V to 40V, TA = +25°C
Pin7 to VCC, TA = +25°C
lchg = ldischg, TA = +25°C
24 33 42
24 35 42
140 220 260
5.2 6.5 7.5
250 300 350
Saturation Voltage, Darlington
Connection
VCE(sat) lSW = 1.0A Pin1 and Pin8 connected
− 1.0 1.3
Saturation Voltage
VCE(sat) lSW = 1.0A, RPin8 = 82to VCC,
Forced β ≅ 20, Note 3
− 0.45 0.7
DC Current Gain
Collector Off−State Current
Comparator
hFE
lC(off)
lSW = 1A, VCE = 5V, TA = +25°C
VCE = 40V
50 75
− 0.01 100
Threshold Voltage
Threshold Voltage Line Regulation
Input Bias Current
Total Device
VTh
Regline
lIB
TA = +25°C
TA = 0° to +70°C
VCC = 5V to 40V
Vin = 0V
1.225 1.25 1.275
1.21 − 1.29
− 1.4 5.0
− −20 −400
Supply Current
ICC VCC = 5V to 40V, CT = 1nF,
−− 4
Pin7 = VCC, VPin5 > Vth, Pin2 = GND,
remaining pins open
Unit
kHz
µA
µA
mV
V
V
µA
V
V
mV
nA
mA
Note 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close
to ambient temperature as possible
Note 3. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch
currents (300mA) and high driver currents (30mA), it may take up to 2µs for it to come
out of saturation. Thi condition will shorten the off time at frequencies 30kHz, and is magni-
fied at high temperatures. Thi condition does not occur with a Darlington configuration, since
the output switch cannot saturate. If a non−Darlington configuration is used, the following
output condition is recommended:
Forced β of output switch:
IC output
IC driver − 7mA *
10
* The 100resistor is the emitter of the driver device requires about 7mA before the
* output switch conducts.
Pin Connection Diagram
Switch Collector 1
Switch Emitter 2
Timing Capacitor 3
GND 4
8 Driver Collector
7 Ipk Sense
6 VCC
5 Comparator Inverting Input

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NTE7173
85
.256 (6.52) Max
14
.393 (10.0)
Max
.150
(3.81)
.300 (7.62)
.100 (2.54)
.300 (7.62)
.070 (1.77) Min
NTE7173SM
.192 (4.9)
8
1
.050 (1.27)
.236
5 (5.99)
.154
(3.91)
4
.016
(.406)
.061
(1.53)
.198 (5.03)
.006 (.152)
NOTE: Pin1 on Beveled Edge