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MC33167 Datasheet

POWER SWITCHING REGULATORS

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Power Switching Regulators
MC34167
MC33167
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
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
Simplified Block Diagram
(Step Down Application)
ILIMIT
Vin
4
Oscillator
PWM
Thermal
S
Q
R
UVLO
Reference
2
EA
1
35
This device contains 143 active transistors.
L
VO
5.05 V/5.0 A
POWER SWITCHING
REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
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
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
1
5
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
ORDERING INFORMATION
Operating
Device Temperature Range Package
MC33167D2T
Surface Mount
MC33167T
Straight Lead
MC33167TH TA = – 40° to +85°C Horiz. Mount
MC33167TV
Vertical Mount
MC34167D2T
Surface Mount
MC34167T
Straight Lead
MC34167TH TA = 0° to + 70°C Horiz. Mount
MC34167TV
Vertical Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 3
1


Motorola Electronic Components Datasheet

MC33167 Datasheet

POWER SWITCHING REGULATORS

No Preview Available !

MC34167 MC33167
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Input Voltage
Switch Output Voltage Range
Voltage Feedback and Compensation Input
Voltage Range
VCC
VO(switch)
VFB, VComp
40
–2.0 to + Vin
–1.0 to + 7.0
V
V
V
Power Dissipation
Case 314A, 314B and 314D (TA = +25°C)
PD Internally Limited W
Thermal Resistance, Junction–to–Ambient
θJA
65 °C/W
Thermal Resistance, Junction–to–Case
Case 936A (D2PAK) (TA = +25°C)
θJC 5.0 °C/W
PD Internally Limited W
Thermal Resistance, Junction–to–Ambient
θJA
70 °C/W
Thermal Resistance, Junction–to–Case
θJC
5.0 °C/W
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature (Note 3)
MC34167
MC33167
TA °C
0 to + 70
– 40 to + 85
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 kHz
81
ERROR AMPLIFIER
Voltage Feedback Input Threshold
TA =+ 25°C
TA = Tlow to Thigh
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
High State (ISource = 75 µA, VFB = 4.5 V)
Low State (ISink = 0.4 mA, VFB = 5.5 V)
VFB(th)
Regline
IIB
PSRR
VOH
VOL
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
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)
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
Vsat
Isw(off)
Ipk(switch)
tr
tf
(VCC –1.5) (VCC –1.8)
V
– 0 100 µA
5.5 6.5
8.0 A
ns
– 100 200
– 50 100
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)
Vth(UVLO)
VH(UVLO)
ICC
5.5
0.6
5.9
0.9
36
40
6.3 V
1.2 V
100 µA
60 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. Tlow = 0°C for MC34167
= – 40°C for MC33167
Thigh = + 70°C for MC34167
= + 85°C for MC33167
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC33167
Description POWER SWITCHING REGULATORS
Maker Motorola
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MC33167 Datasheet PDF





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