Motorola MC34166TV, MC34166D2TR4, MC34166T, MC34166TH, MC33166D2T Datasheet

Order this document by MC34166/D

					MC34166
	Power	Switching	Regulators		MC33166
	The MC34166, MC33166 series are high performance fixed frequency
	power switching regulators that contain the primary functions required for				POWER SWITCHING
	dc±to±dc converters. This series was specifically designed to be
	incorporated in step±down and voltage±inverting configurations with a				REGULATORS
	minimum number of external components and can also be used cost
	effectively in step±up applications.		temperature compensated		SEMICONDUCTOR
	These devices	consist of an internal			TECHNICAL DATA
	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,				TH SUFFIX
	undervoltage lockout, and thermal shutdown. Also included is a low power				PLASTIC PACKAGE
	standby mode that reduces power supply current to 36 μA.				CASE 314A
	• Output Switch Current in Excess of 3.0 A
	• Fixed Frequency Oscillator (72 kHz) with On±Chip Timing					1
						5
	• Provides 5.05 V Output without External Resistor Divider
	• Precision 2% Reference				1	TV SUFFIX
	• 0% to 95% Output Duty Cycle
						PLASTIC PACKAGE
	• Cycle±by±Cycle Current Limiting				5
						CASE 314B
	• Undervoltage Lockout with Hysteresis				Heatsink surface connected to Pin 3.
	• Internal Thermal Shutdown
	• Operation from 7.5 V to 40 V				T SUFFIX
	• Standby Mode Reduces Power Supply Current to 36 μA
					PLASTIC PACKAGE
	• Economical 5±Lead TO±220 Package with Two Optional Leadforms				CASE 314D
	• Also Available in Surface Mount D2PAK Package					1
						5
					Pin 1.	Voltage Feedback Input
					2.	Switch Output
					3.	Ground
					4.	Input Voltage/VCC
		Simplified Block Diagram			5.	Compensation/Standby
		(Step Down Application)		Vin
						D2T SUFFIX
				4
		ILIMIT				PLASTIC PACKAGE
						CASE 936A
					1	(D2PAK)

Oscillator	S			5
		Q		Heatsink surface (shown as terminal 6
				in case outline drawing) is connected to Pin 3.
	R	2
PWM
				ORDERING INFORMATION
		UVLO			Operating
Thermal			L
				Device	Temperature Range	Package
		Reference		MC33166D2T		Surface Mount
				MC33166T	T = ± 40° to + 85°C Straight Lead
		EA		MC33166TH	A	Horiz. Mount
		1
			VO	MC33166TV		Vertical Mount
			5.05 V/3.0 A	MC34166D2T		Surface Mount
3				MC34166T	TA = 0° to + 70°C	Straight Lead
		5		MC34166TH		Horiz. Mount
This device contains 143 active transistors.				MC34166TV		Vertical Mount

Motorola, Inc. 1996

Rev 4

MC34166 MC33166

MAXIMUM RATINGS

Rating	Symbol	Value	Unit
Power Supply Input Voltage	VCC	40	V
Switch Output Voltage Range	VO(switch)	±1.5 to + Vin	V
Voltage Feedback and Compensation Input	VFB, VComp	±1.0 to + 7.0	V
Voltage Range
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	θJC	5.0	°C/W
Case 936A (D2PAK) (T = +25°C)	P	Internally Limited	W
A	D
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)	TA		°C
MC34166		0 to + 70
MC33166		± 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	fOSC	65	72	79	kHz
		TA = Tlow to Thigh		62	±	81
ERROR AMPLIFIER
Voltage Feedback Input Threshold		TA = +25°C	VFB(th)	4.95	5.05	5.15	V
		TA = Tlow to Thigh		4.85	±	5.2
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	μA
Power Supply Rejection Ratio (VCC = 10 V to 20 V, f = 120 Hz)			PSRR	60	80	±	dB
Output Voltage Swing							V
High State (ISource = 75 μA, VFB = 4.5 V)			VOH	4.2	4.9	±
Low State (ISink = 0.4 mA, VFB = 5.5 V)			VOL	±	1.6	1.9
PWM COMPARATOR
Duty Cycle							%
Maximum (VFB = 0 V)			DC(max)	92	95	100
Minimum (VComp = 1.9 V)			DC(min)	0	0	0
SWITCH OUTPUT
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)							ns
Output Voltage Rise Time			tr	±	100	200
Output Voltage Fall Time			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 )			ICC				μA
Standby (VCC = 12 V, VComp < 0.15 V)				±	36	100
Operating (VCC = 40 V, Pin 1 = Gnd for maximum duty cycle)				±	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	Thigh	= + 70°C for MC34166
= ± 40°C for MC33166		= + 85°C for MC33166

2	MOTOROLA ANALOG IC DEVICE DATA

MC34166 MC33166

(V)

Figure 1. Voltage Feedback Input Threshold

versus Temperature

THRESHOLD

5.17

5.25

INPUT

VCC =

12 V

V

FB(th) Max

= 5.15 V

5.09

FEEDBACK

V

FB(th) Typ

= 5.05 V

5.01

VOLTAGE,

V

FB(th) Min

= 4.95 V

4.93

FB(th)

± 55

± 25

0

25

50

75

100

125

V

4.85

TA, AMBIENT TEMPERATURE (°C)

Figure 3. Error Amp Open Loop Gain and

Phase versus Frequency

			Figure 2. Voltage Feedback Input Bias
					Current versus Temperature
(nA)	100
	80										V	CC = 12 V
											V	FB = VFB(th)
CURRENTBIAS
	60
, INPUT	40
	20
IB
I
	0
			± 25		0		25		50		75		100	125
	± 55
					TA, AMBIENT TEMPERATURE (°C)

Figure 4. Error Amp Output Saturation

versus Sink Current

GAINVOLTAGELOOPOPEN, (dB)	100				VCC = 12 V		0		VOLTAGESATURATIONOUTPUT(V)	2.0
								(DEGREES)PHASEEXCESS		0.4				TA = +25°C
	80				VComp = 3.25 V		30
					RL = 100 k					1.6
			Gain
						°
	60				TA = +25 C		60
										1.2
	40						90
						Phase				0.8
	20						120							VCC = 12 V
														VFB = 5.5 V
VOL	0						150	φ,	,
									sat
A	± 20						180		V	0
		100	1.0 k	10 k	100 k	1.0 M					0.4	0.8	1.2	1.6	2.0
	10						10 M			0
			f, FREQUENCY (Hz)									ISink, OUTPUT SINK CURRENT (mA)

Figure 5. Oscillator Frequency Change

Figure 6. Switch Output Duty Cycle

f OSC, OSCILLATOR FREQUENCY CHANGE (%)

versus Temperature

versus Compensation Voltage

4.0

VCC = 12 V

0

± 4.0

± 8.0

± 12

± 55 ± 25 0 25 50 75 100 125

(%)	100
DUTY CYCLE	80	VCC = 12 V
		TA = +25°C
	60
OUTPUT	40
DC, SWITCH	20
	0
		2.0	2.5	3.0	3.5	4.0	4.5
	1.5

TA, AMBIENT TEMPERATURE (°C)

VComp, COMPENSATION VOLTAGE (V)

MOTOROLA ANALOG IC DEVICE DATA	3

MC34166 MC33166

Figure 7. Switch Output Source Saturation

(V)

versus Source Current

SATURATION

0

TA = +25°C

VCC

SOURCE

± 0.5

±1.0

OUTPUT

±1.5

± 2.0

SWITCH,

± 2.5

sat ± 3.0

0

1.0

2.0

3.0

4.0

5.0

V

ISource, SWITCH OUTPUT SOURCE CURRENT (A)

Figure 9. Switch Output Current Limit

Threshold versus Temperature

(A)	4.7
THRESHOLDLIMIT											VCC	= 12 V
											Pins	1, 2, 3 =		Gnd
	4.5
, CURRENT	4.3
	4.1
pk(switch)	3.9
I			± 25		0		25		50		75		100		125
	± 55

TA, AMBIENT TEMPERATURE (°C)

Figure 11. Undervoltage Lockout

(V)				Threshold versus Temperature
THRESHOLD
	6.5
	6.0								Startup Threshold
LOCKOUT									VCC Increasing
	5.5
UNDERVOLTAGE,									Turn±Off Threshold
	5.0								VCC Decreasing
th(UVLO)	4.5
	4.0
					T ,	AMBIENT		TEMPERATURE (°C)
	± 55		± 25		0		25		50	75	100		125
V					A

Figure 8. Negative Switch Output Voltage

versus Temperature

0

(V)

VCC =

12 V

Gnd

± 0.2

VOLTAGE

± 0.4

Pin 2

Driven Negative

Pin 5 = 2.0 V

Pins 1, 3 = Gnd

OUTPUT

± 0.6

Isw

= 100 μA

SWITCH,

±1.0

± 0.8

Isw = 10

mA

sw

V

±1.2

± 25

0

25

50

75

100

125

± 55

TA, AMBIENT TEMPERATURE (°C)

Figure 10. Standby Supply Current

versus Supply Voltage

	160
			Pin 4	= VCC
A)		Pins 1,		3, 5 = Gnd
	120		Pin 2	Open
(μ
			TA =	+25°C
CURRENT
	80
,SUPPLY	40
CC
I
	0
		10				20		30		40
	0

VCC, SUPPLY VOLTAGE (V)

Figure 12. Operating Supply Current

versus Supply Voltage

	40
(mA)	30
CURRENT	20
, SUPPLY	10			Pin 4 = VCC
				Pins 1, 3 = Gnd
CC				Pins 2, 5 Open
I				TA = +25°C
	0				40
	0	10	20	30

VCC, SUPPLY VOLTAGE (V)

4	MOTOROLA ANALOG IC DEVICE DATA

		MC34166 MC33166
Figure 13. MC34166 Representative Block Diagram
						Vin
+			Current			4
			Sense
						Input Voltage/VCC
Oscillator						Cin
		S
CT						Switch
		Q
						Output
		R				2
Pulse Width				Undervoltage
		PWM Latch
Modulator				Lockout
		Thermal						L
		Shutdown		5.05 V
			+	Reference
					+	Voltage
				Error
		100 μA				Feedback
				Amp
						Input
						1	R2	VO
			120					CO
Gnd	3	Compensation	5	CF	RF

=					R1
	Sink Only
	Positive True Logic

Figure 14. Timing Diagram

4.1 V

Timing Capacitor CT

Compensation

2.3 V

ON

Switch Output

OFF

MOTOROLA ANALOG IC DEVICE DATA	5