Order this document by MC34167/D
Power Switching Regulators
The MC34167, MC33167 series are high performance fixed frequency
power switching regulators that contain the primary functions required for
dc–to–dc converters. This series was specifically designed to be
incorporated in step–down and voltage–inverting configurations with a
minimum number of external components and can also be used cost
effectively in step–up applications.
These devices consist of an internal temperature compensated
reference, fixed frequency oscillator with on–chip timing components,
latching pulse width modulator for single pulse metering, high gain error
amplifier, and a high current output switch.
Protective features consist of cycle–by–cycle current limiting,
undervoltage lockout, and thermal shutdown. Also included is a low power
standby mode that reduces power supply current to 36
µA.
•
Output Switch Current in Excess of 5.0 A
MC34167
MC33167
POWER SWITCHING
REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
•
•
•
•
•
•
•
•
•
•
•
TH SUFFIX
PLASTIC PACKAGE
CASE 314A
1
5
Fixed Frequency Oscillator (72 kHz) with On–Chip Timing
Provides 5.05 V Output without External Resistor Divider
Precision 2% Reference
0% to 95% Output Duty Cycle
Cycle–by–Cycle 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
µA
Economical 5–Lead TO–220 Package with Two Optional Leadforms
Also Available in Surface Mount D2PAK Package
T SUFFIX
PLASTIC PACKAGE
CASE 314D
1
5
5
1
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
Heatsink surface connected to Pin 3.
Simplified Block Diagram
(Step Down Application)
ILIMIT
Oscillator
4
Pin 1.
2.
3.
4.
5.
Vin
Voltage Feedback Input
Switch Output
Ground
Input Voltage/VCC
Compensation/Standby
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
1
S
Q
R
2
5
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
PWM
ORDERING INFORMATION
UVLO
Thermal
Reference
EA
1
VO
5.05 V/5.0 A
L
Device
Operating
Temperature Range
Package
Surface Mount
Straight Lead
Horiz. Mount
Vertical Mount
Surface Mount
Straight Lead
Horiz. Mount
Vertical Mount
Rev 3
MC33167D2T
MC33167T
TA = – 40° to +85°C
MC33167TH
MC33167TV
MC34167D2T
MC34167T
MC34167TH
MC34167TV
3
5
This device contains 143 active transistors.
TA = 0° to + 70°C
©
Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1
MC34167 MC33167
MAXIMUM RATINGS
Rating
Power Supply Input Voltage
Switch Output Voltage Range
Voltage Feedback and Compensation Input
Voltage Range
Power Dissipation
Case 314A, 314B and 314D (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
Operating Ambient Temperature (Note 3)
MC34167
MC33167
Storage Temperature Range
Symbol
VCC
VO(switch)
VFB, VComp
Value
40
–2.0 to + Vin
–1.0 to + 7.0
Unit
V
V
V
PD
θ
JA
θ
JC
PD
θ
JA
θ
JC
TJ
TA
Internally Limited
65
5.0
Internally Limited
70
5.0
+150
0 to + 70
– 40 to + 85
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
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
OSCILLATOR
Frequency (VCC = 7.5 V to 40 V)
ERROR AMPLIFIER
Voltage Feedback Input Threshold
TA =+ 25°C
TA = Tlow to Thigh
VFB(th)
Regline
IIB
PSRR
VOH
VOL
DC(max)
DC(min)
Vsat
Isw(off)
Ipk(switch)
tr
tf
Vth(UVLO)
VH(UVLO)
ICC
–
–
36
40
100
60
4.95
4.85
–
–
60
4.2
–
5.05
–
0.03
0.15
80
4.9
1.6
5.15
5.20
0.078
1.0
–
–
1.9
V
%/V
µA
dB
V
TA = +25°C
TA = Tlow to Thigh
fOSC
65
62
72
–
79
81
kHz
Symbol
Min
Typ
Max
Unit
Line Regulation (VCC = 7.5 V to 40 V, TA = +25°C)
Input Bias Current (VFB = VFB(th) + 0.15 V)
Power Supply Rejection Ratio (VCC = 10 V to 20 V, f = 120 Hz)
Output Voltage Swing
PWM COMPARATOR
Duty Cycle (VCC = 20 V)
SWITCH OUTPUT
Output Voltage Source Saturation (VCC = 7.5 V, ISource = 5.0 A)
Off–State Leakage (VCC = 40 V, Pin 2 = Gnd)
Current Limit Threshold (VCC = 7.5 V)
Switching Times (VCC = 40 V, Ipk = 5.0 A, L = 225
µH,
TA = +25°C)
Output Voltage Rise Time
Output Voltage Fall Time
UNDERVOLTAGE LOCKOUT
Startup Threshold (VCC Increasing, TA = +25°C)
Hysteresis (VCC Decreasing, TA = +25°C)
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)
Maximum (VFB = 0 V)
Minimum (VComp = 1.9 V)
High State (ISource = 75
µA,
VFB = 4.5 V)
Low State (ISink = 0.4 mA, VFB = 5.5 V)
92
0
95
0
100
0
%
–
–
5.5
–
–
(VCC –1.5)
0
6.5
100
50
(VCC –1.8)
100
8.0
200
100
V
µA
A
ns
5.5
0.6
5.9
0.9
6.3
1.2
V
V
µA
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
2
MOTOROLA ANALOG IC DEVICE DATA
MC34167 MC33167
V FB(th), VOLTAGE FEEDBACK INPUT THRESHOLD (V)
Figure 1. Voltage Feedback Input Threshold
versus Temperature
5.25
I IB, INPUT BIAS CURRENT (nA)
VCC = 12 V
5.17
5.09
5.01
VFB(th) Min = 4.95 V
4.93
4.85
– 55
VFB(th) Max = 5.15 V
100
80
60
40
20
0
– 55
Figure 2. Voltage Feedback Input Bias
Current versus Temperature
VCC = 12 V
VFB = VFB(th)
VFB(th) Typ = 5.05 V
– 25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
– 25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
Figure 3. Error Amp Open Loop Gain and
Phase versus Frequency
VCC = 12 V
VComp = 3.25 V
RL = 100 k
TA = +25°C
Vsat , OUTPUT SATURATION VOLTAGE (V)
A VOL , OPEN LOOP VOLTAGE GAIN (dB)
100
80
Gain
60
40
Phase
20
0
– 20
10
120
150
180
10 M
0
30
60
90
φ
, EXCESS PHASE (DEGREES)
2.0
1.6
1.2
0.8
0.4
0
Figure 4. Error Amp Output Saturation
versus Sink Current
VCC = 12 V
VFB = 5.5 V
TA = +25°C
100
1.0 k
10 k
100 k
f, FREQUENCY (Hz)
1.0 M
0
0.4
0.8
1.2
1.6
ISink, OUTPUT SINK CURRENT (mA)
2.0
∆
f OSC , OSCILLATOR FREQUENCY CHANGE (%)
Figure 5. Oscillator Frequency Change
versus Temperature
4.0
DC, SWITCH OUTPUT DUTY CYCLE (%)
VCC = 12 V
100
80
60
40
20
0
1.5
Figure 6. Switch Output Duty Cycle
versus Compensation Voltage
0
VCC = 12 V
TA = +25°C
– 4.0
– 8.0
– 12
– 55
– 25
0
25
50
75
100
TA, AMBIENT TEMPERATURE (°C)
125
2.0
2.5
3.0
3.5
4.0
VComp, COMPENSATION VOLTAGE (V)
4.5
MOTOROLA ANALOG IC DEVICE DATA
3
MC34167 MC33167
Vsat, SWITCH OUTPUT SOURCE SATURATION (V)
Figure 7. Switch Output Source Saturation
versus Source Current
0
– 0.5
TA = +25°C
–1.0
–1.5
– 2.0
– 2.5
– 3.0
0
2.0
4.0
6.0
ISource, SWITCH OUTPUT SOURCE CURRENT (A)
8.0
Vsw, SWITCH OUTPUT VOLTAGE (V)
VCC
0
Figure 8. Negative Switch Output Voltage
versus Temperature
Gnd
– 0.2
– 0.4
– 0.6
– 0.8
–1.0
–1.2
– 55
– 25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
Isw = 10 mA
VCC = 12 V
Pin 5 = 2.0 V
Pins 1, 3 = Gnd
Pin 2 Driven Negative
Isw = 100
µA
Figure 9. Switch Output Current Limit
Threshold versus Temperature
I pk(switch), CURRENT LIMIT THRESHOLD (A)
7.2
I CC , SUPPLY CURRENT (
µ
A)
VCC = 12 V
Pins 1, 2, 3 = Gnd
6.8
160
Figure 10. Standby Supply Current
versus Supply Voltage
Pin 4 = VCC
Pins 1, 3, 5 = Gnd
Pin 2 Open
TA = +25°C
120
6.4
80
6.0
40
5.6
– 55
– 25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
0
0
10
20
30
VCC, SUPPLY VOLTAGE (V)
40
V th(UVLO) , UNDERVOLTAGE LOCKOUT THRESHOLD (V)
Figure 11. Undervoltage Lockout
Thresholds versus Temperature
6.5
I CC, SUPPLY CURRENT (mA)
6.0
5.5
5.0
4.5
4.0
– 55
Turn–Off Threshold
VCC Decreasing
Startup Threshold
VCC Increasing
50
40
30
20
10
0
Figure 12. Operating Supply Current
versus Supply Voltage
Pin 4 = VCC
Pins 1, 3 = Gnd
Pins 2, 5 Open
TA = +25°C
0
10
20
30
VCC, SUPPLY VOLTAGE (V)
40
– 25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
4
MOTOROLA ANALOG IC DEVICE DATA
MC34167 MC33167
Figure 13. MC34167 Representative Block Diagram
Vin
+
Oscillator
CT
Current
Sense
4
Input Voltage/VCC
Cin
S
Q
R
Pulse Width
Modulator
PWM Latch
Undervoltage
Lockout
Switch
Output
2
Thermal
Shutdown
+
100
µA
5.05 V
Reference
Error
Amp
+
Voltage
Feedback
Input
1
R2
L
VO
CO
120
Gnd
3
Compensation
5
CF
RF
=
Sink Only
Positive True Logic
R1
Figure 14. Timing Diagram
4.1 V
Timing Capacitor CT
Compensation
2.3 V
ON
Switch Output
OFF
MOTOROLA ANALOG IC DEVICE DATA
5
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