MC34167
MC33167
Order this document by MC34167/D
SEMICONDUCTOR
TECHNICAL DATA
POWER SWITCHING
REGULATORS
T SUFFIX
PLASTIC PACKAGE
CASE 314D
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
TH SUFFIX
PLASTIC PACKAGE
CASE 314A
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
Heatsink surface connected to Pin 3.
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
5
1
5
1
5
1
5
1
MC34167D2T
MC34167T
MC34167TH
MC34167TV
TA = 0
to + 70
C
Surface Mount
Straight Lead
Horiz. Mount
Vertical Mount
MC33167D2T
MC33167T
MC33167TH
MC33167TV
TA = 40
to +85
C
Surface Mount
Straight Lead
Horiz. Mount
Vertical Mount
1
MOTOROLA ANALOG IC DEVICE DATA
Power Switching Regulators
The MC34167, MC33167 series are high performance fixed frequency
power switching regulators that contain the primary functions required for
dctodc converters. This series was specifically designed to be
incorporated in stepdown and voltageinverting configurations with a
minimum number of external components and can also be used cost
effectively in stepup applications.
These devices consist of an internal temperature compensated
reference, fixed frequency oscillator with onchip timing components,
latching pulse width modulator for single pulse metering, high gain error
amplifier, and a high current output switch.
Protective features consist of cyclebycycle current limiting,
undervoltage lockout, and thermal shutdown. Also included is a low power
standby mode that reduces power supply current to 36
A.
Output Switch Current in Excess of 5.0 A
Fixed Frequency Oscillator (72 kHz) with OnChip Timing
Provides 5.05 V Output without External Resistor Divider
Precision 2% Reference
0% to 95% Output Duty Cycle
CyclebyCycle Current Limiting
Undervoltage Lockout with Hysteresis
Internal Thermal Shutdown
Operation from 7.5 V to 40 V
Standby Mode Reduces Power Supply Current to 36
A
Economical 5Lead TO220 Package with Two Optional Leadforms
Also Available in Surface Mount D2PAK Package
Simplified Block Diagram
(Step Down Application)
EA
VO
ILIMIT
Vin
4
2
S
Q
R
UVLO
3
5
L
5.05 V/5.0 A
Reference
Thermal
PWM
Oscillator
1
This device contains 143 active transistors.
Motorola, Inc. 1996
Rev 3
MC34167 MC33167
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Input Voltage
VCC
40
V
Switch Output Voltage Range
VO(switch)
2.0 to + Vin
V
Voltage Feedback and Compensation Input
Voltage Range
VFB, VComp
1.0 to + 7.0
V
Power Dissipation
Case 314A, 314B and 314D (TA = +25
C)
PD
Internally Limited
W
Thermal Resistance, JunctiontoAmbient
JA
65
C/W
Thermal Resistance, JunctiontoCase
JC
5.0
C/W
Case 936A (D2PAK) (TA = +25
C)
PD
Internally Limited
W
Thermal Resistance, JunctiontoAmbient
JA
70
C/W
Thermal Resistance, JunctiontoCase
JC
5.0
C/W
Operating Junction Temperature
TJ
+150
C
Operating Ambient Temperature (Note 3)
MC34167
MC33167
TA
0 to + 70
40 to + 85
C
Storage Temperature Range
Tstg
65 to +150
C
ELECTRICAL CHARACTERISTICS
(VCC = 12 V, for typical values TA = +25
C, for min/max values TA is the operating ambient
temperature range that applies [Notes 2, 3], unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (VCC = 7.5 V to 40 V)
TA = +25
C
TA = Tlow to Thigh
fOSC
65
62
72
79
81
kHz
ERROR AMPLIFIER
Voltage Feedback Input Threshold
TA =+ 25
C
TA = Tlow to Thigh
VFB(th)
4.95
4.85
5.05
5.15
5.20
V
Line Regulation (VCC = 7.5 V to 40 V, TA = +25
C)
Regline
0.03
0.078
%/V
Input Bias Current (VFB = VFB(th) + 0.15 V)
IIB
0.15
1.0
A
Power Supply Rejection Ratio (VCC = 10 V to 20 V, f = 120 Hz)
PSRR
60
80
dB
Output Voltage Swing
High State (ISource = 75
A, VFB = 4.5 V)
Low State (ISink = 0.4 mA, VFB = 5.5 V)
VOH
VOL
4.2
4.9
1.6
1.9
V
PWM COMPARATOR
Duty Cycle (VCC = 20 V)
Maximum (VFB = 0 V)
Minimum (VComp = 1.9 V)
DC(max)
DC(min)
92
0
95
0
100
0
%
SWITCH OUTPUT
Output Voltage Source Saturation (VCC = 7.5 V, ISource = 5.0 A)
Vsat
(VCC 1.5)
(VCC 1.8)
V
OffState Leakage (VCC = 40 V, Pin 2 = Gnd)
Isw(off)
0
100
A
Current Limit Threshold (VCC = 7.5 V)
Ipk(switch)
5.5
6.5
8.0
A
Switching Times (VCC = 40 V, Ipk = 5.0 A, L = 225
H, TA = +25
C)
Output Voltage Rise Time
Output Voltage Fall Time
tr
tf
100
50
200
100
ns
UNDERVOLTAGE LOCKOUT
Startup Threshold (VCC Increasing, TA = +25
C)
Vth(UVLO)
5.5
5.9
6.3
V
Hysteresis (VCC Decreasing, TA = +25
C)
VH(UVLO)
0.6
0.9
1.2
V
TOTAL DEVICE
Power Supply Current (TA = +25
C )
Standby (VCC = 12 V, VComp < 0.15 V)
Operating (VCC = 40 V, Pin 1 = Gnd for maximum duty cycle)
ICC
36
40
100
60
A
mA
NOTES: 1. Maximum package power dissipation limits must be observed to prevent thermal shutdown activation.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
3. T
low
= 0
C for MC34167
T
high
= + 70
C for MC34167
= 40
C for MC33167
= + 85
C for MC33167
MC34167 MC33167
3
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Voltage Feedback Input Threshold
versus Temperature
Figure 2. Voltage Feedback Input Bias
Current versus Temperature
Figure 3. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 4. Error Amp Output Saturation
versus Sink Current
Figure 5. Oscillator Frequency Change
versus Temperature
Figure 6. Switch Output Duty Cycle
versus Compensation Voltage
20
A
VOL
, OPEN LOOP
VOL
T
AGE GAIN (dB)
10 M
10
f, FREQUENCY (Hz)
0
30
60
90
120
150
180
100
1.0 k
10 k
100 k
1.0 M
0
20
40
60
80
100
, EXCESS PHASE (DEGREES)
Gain
Phase
12
55
TA, AMBIENT TEMPERATURE (
C)
25
0
25
50
75
100
125
8.0
4.0
0
4.0
VCC = 12 V
, OSCILLA
T
OR
FREQUENCY
CHANGE (%)
OSCf
4.85
V
FB(th)
,
VOL
T
AGE FEEDBACK INPUT
THRESHOLD
(V)
TA, AMBIENT TEMPERATURE (
C)
4.93
5.01
5.09
5.17
5.25
55
25
0
25
50
75
100
125
VCC = 12 V
0
I IB
, INPUT
BIAS CURRENT
(nA)
TA, AMBIENT TEMPERATURE (
C)
20
40
60
80
100
55
25
0
25
50
75
100
125
V
sat
, OUTPUT
SA
TURA
TION VOL
T
AGE
(V)
2.0
0
ISink, OUTPUT SINK CURRENT (mA)
0.4
0.8
1.2
1.6
0
0.4
0.8
1.2
1.6
2.0
VCC = 12 V
VFB = 5.5 V
TA = +25
C
DC, SWITCH OUTPUT
DUTY
CYCLE (%)
1.5
VComp, COMPENSATION VOLTAGE (V)
2.0
2.5
3.0
3.5
4.0
0
20
40
60
80
100
VCC = 12 V
TA = +25
C
4.5
VCC = 12 V
VComp = 3.25 V
RL = 100 k
TA = +25
C
VFB(th) Max = 5.15 V
VFB(th) Min = 4.95 V
VFB(th) Typ = 5.05 V
VCC = 12 V
VFB = VFB(th)
MC34167 MC33167
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 7. Switch Output Source Saturation
versus Source Current
Figure 8. Negative Switch Output Voltage
versus Temperature
Figure 9. Switch Output Current Limit
Threshold versus Temperature
Figure 10. Standby Supply Current
versus Supply Voltage
Figure 11. Undervoltage Lockout
Thresholds versus Temperature
Figure 12. Operating Supply Current
versus Supply Voltage
4.5
55
TA, AMBIENT TEMPERATURE (
C)
25
0
25
50
75
100
125
5.0
5.5
6.0
6.5
, UNDER
VOL
T
AGE
LOCKOUT
THRESHOLD
(V)
th(UVLO)
V
2.5
ISource, SWITCH OUTPUT SOURCE CURRENT (A)
2.0
1.5
1.0
0.5
0
0
2.0
4.0
6.0
8.0
TA, AMBIENT TEMPERATURE (
C)
55
25
0
25
50
75
100
125
3.0
V
sat
, SWITCH OUTPUT
SOURCE SA
TURA
TION (V)
1.0
0.8
0.6
0.4
0.2
0
1.2
V
sw
, SWITCH OUTPUT
VOL
T
AGE (V)
VCC = 12 V
Pin 5 = 2.0 V
Pins 1, 3 = Gnd
Pin 2 Driven Negative
Gnd
5.6
6.0
6.4
6.8
7.2
, CURRENT
LIMIT
THRESHOLD
(A)
pk(switch)I
55
25
0
25
50
75
100
125
VCC = 12 V
Pins 1, 2, 3 = Gnd
0
40
80
120
160
, SUPPL
Y
CURRENT
(
CCI
0
VCC, SUPPLY VOLTAGE (V)
10
20
30
40
Pin 4 = VCC
Pins 1, 3, 5 = Gnd
Pin 2 Open
TA = +25
C
A)
4.0
, SUPPL
Y
CURRENT
(mA)
CCI
0
0
VCC, SUPPLY VOLTAGE (V)
10
20
30
40
10
20
30
40
50
Pin 4 = VCC
Pins 1, 3 = Gnd
Pins 2, 5 Open
TA = +25
C
TA, AMBIENT TEMPERATURE (
C)
Startup Threshold
VCC Increasing
TA = +25
C
VCC
Isw = 10 mA
Isw = 100
A
TurnOff Threshold
VCC Decreasing
MC34167 MC33167
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 13. MC34167 Representative Block Diagram
+
4
2
1
5
3
+
CF
RF
R1
CO
VO
R2
120
Error
Amp
5.05 V
Reference
Thermal
Shutdown
Oscillator
S
R
Q
Pulse Width
Modulator
CT
PWM Latch
Gnd
Compensation
100
A
Undervoltage
Lockout
Voltage
Feedback
Input
L
Switch
Output
Current
Sense
Vin
Cin
Input Voltage/VCC
Sink Only
Positive True Logic
=
Figure 14. Timing Diagram
4.1 V
Timing Capacitor CT
Compensation
2.3 V
ON
OFF
Switch Output
+
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