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MC33166 Datasheet

POWER SWITCHING REGULATORS

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Power Switching Regulators
MC34166
MC33166
The MC34166, MC33166 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 3.0 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
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
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/3.0 A
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
1 (D2PAK)
5
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
ORDERING INFORMATION
Operating
Device Temperature Range Package
MC33166D2T
Surface Mount
MC33166T TA = – 40° to + 85°C Straight Lead
MC33166TH
Horiz. Mount
MC33166TV
Vertical Mount
MC34166D2T
Surface Mount
MC34166T
MC34166TH
TA = 0° to + 70°C Straight Lead
Horiz. Mount
MC34166TV
Vertical Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 4
1


Motorola Electronic Components Datasheet

MC33166 Datasheet

POWER SWITCHING REGULATORS

No Preview Available !

MC34166 MC33166
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
–1.5 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)
MC34166
MC33166
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
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)
PWM COMPARATOR
fOSC 65 72 79 kHz
62 – 81
VFB(th)
4.95 5.05 5.15
4.85 –
5.2
V
Regline
0.03
0.078
%/V
IIB – 0.15 1.0 µA
PSRR 60 80
– dB
VOH
VOL
V
4.2 4.9
– 1.6 1.9
Duty Cycle
Maximum (VFB = 0 V)
Minimum (VComp = 1.9 V)
SWITCH OUTPUT
DC(max)
DC(min)
92
0
%
95 100
00
Output Voltage Source Saturation (VCC = 7.5 V, ISource = 3.0 A)
Vsat
(VCC
(VCC
V
–1.5)
–1.8)
Off–State Leakage (VCC = 40 V, Pin 2 = Gnd)
Isw(off)
0 100 µA
Current Limit Threshold
Ipk(switch)
3.3
4.3
6.0
A
Switching Times (VCC = 40 V, Ipk = 3.0 A, L = 375 µH, TA = +25°C)
Output Voltage Rise Time
Output Voltage Fall Time
ns
tr – 100 200
tf – 50 100
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
– 36 100 µA
– 31 55 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 MC34166
= – 40°C for MC33166
Thigh = + 70°C for MC34166
= + 85°C for MC33166
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC33166
Description POWER SWITCHING REGULATORS
Maker Motorola
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MC33166 Datasheet PDF






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