Freescale Semiconductor, Inc.
Order this document by MC34129/D
High Performance
Current Mode Controllers
The MC34129/MC33129 are high performance current mode switching
regulators specifically designed for use in low power digital telephone
applications. These integrated circuits feature a unique internal fault timer
that provides automatic restart for overload recovery. For enhanced system
efficiency, a start/run comparator is included to implement bootstrapped
operation of VCC. Other functions contained are a temperature compensated
reference, reference amplifier, fully accessible error amplifier, sawtooth
oscillator with sync input, pulse width modulator comparator, and a high
current totem pole driver ideally suited for driving a power MOSFET.
Also included are protective features consisting of soft–start,
undervoltage lockout, cycle–by–cycle current limiting, adjustable deadtime,
and a latch for single pulse metering.
Although these devices are primarily intended for use in digital telephone
systems, they can be used cost effectively in many other applications.
•
Current Mode Operation to 300 kHz
MC34129
MC33129
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
Freescale Semiconductor, Inc...
14
1
P SUFFIX
PLASTIC PACKAGE
CASE 646
•
•
•
•
•
•
•
•
•
Automatic Feed Forward Compensation
Latching PWM for Cycle–by–Cycle Current Limiting
Continuous Retry after Fault Timeout
Soft–Start with Maximum Peak Switch Current Clamp
Internally Trimmed 2% Bandgap Reference
High Current Totem Pole Driver
Input Undervoltage Lockout
Low Startup and Operating Current
Direct Interface with Motorola SENSEFET Products
Drive Output
Drive Ground
Ramp Input
14
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
PIN CONNECTIONS
1
2
3
14 VCC
13 Start/Run Output
12 CSoft–Start
Feedback/
11 PWM Input
Error Amp
10
Inverting Input
9 Error Amp
Noninverting Input
8 Vref 1.25 V
(Top View)
Simplified Block Diagram
Start/Run
12
Soft–Start
and
Fault Timer
Undervoltage
Lockout
1.25V
Reference
Gnd
7
Error Amp
6
X2
Latching
PWM
RT/CT
Sync/Inhibit
Input
5
4
Oscillator
9 Noninverting
Input
+
10
–
Inverting
Input
11
Feedback/
1 PWM Input
Drive Out
2
Drive Gnd
3
Ramp Input
13
Start/Run
Output
VCC
Sync/Inhibit 4
Input
RT/CT 5
Vref 2.5 V
6
CSoft–Start
14
Gnd 7
8
Vref 1.25V
ORDERING INFORMATION
Device
MC34129D
MC34129P
MC33129D
MC33129P
Operating
Temperature Range
TA = 0° to +70°C
TA = – 40° to +85°C
Package
SO–14
Plastic DIP
SO–14
Plastic DIP
Rev 1
Vref 2.5V
©
Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
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Freescale Semiconductor, Inc.
MC34129 MC33129
MAXIMUM RATINGS
Rating
VCC Zener Current
Start/Run Output Zener Current
Analog Inputs (Pins 3, 5, 9, 10, 11, 12)
Sync Input Voltage
Drive Output Current, Source or Sink
Current, Reference Outputs (Pins 6, 8)
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package Case 751A
Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction–to–Air
P Suffix, Plastic Package Case 646
Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction–to–Air
Operating Junction Temperature
Symbol
IZ(VCC)
IZ(Start/Run)
–
Vsync
IDRV
Iref
Value
50
50
–0.3 to 5.5
–0.3 to VCC
1.0
20
Unit
mA
mA
V
V
A
mA
PD
R
θJA
PD
R
θJA
TJ
TA
552
145
800
100
+150
0 to +70
–40 to +85
mW
°C/W
mW
°C/W
°C
°C
Freescale Semiconductor, Inc...
Operating Ambient Temperature
MC34129
MC33129
Storage Temperature Range
Tstg
–65 to +150
°C
ELECTRICAL CHARACTERISTICS
(VCC = 10 V, TA = 25°C [Note 1], unless otherwise noted.)
Characteristics
REFERENCE SECTIONS
Reference Output Voltage, TA = 25°C
1.25 V Ref., IL = 0 mA
2.50 V Ref., IL = 1.0 mA
Reference Output Voltage, TA = Tlow to Thigh
1.25 V Ref., IL = 0 mA
2.50 V Ref., IL = 1.0 mA
Line Regulation (VCC = 4.0 V to 12 V)
1.25 V Ref., IL = 0 mA
2.50 V Ref., IL = 1.0 mA
Load Regulation
1.25 V Ref., IL = –10
µA
to +500
µA
2.50 V Ref., IL = –0.1 mA to +1.0 mA
ERROR AMPLIFIER
Input Offset Voltage (Vin = 1.25 V)
TA = 25°C
TA = Tlow to Thigh
Input Offset Current (Vin = 1.25 V)
Input Bias Current (Vin = 1.25 V)
TA = 25°C
TA = Tlow to Thigh
Input Common Mode Voltage Range
Open Loop Voltage Gain (VO = 1.25 V)
Gain Bandwidth Product (VO = 1.25 V, f = 100 kHz)
Power Supply Rejection Ratio (VCC = 5.0 V to 10 V)
Output Source Current (VO = 1.5 V)
Output Voltage Swing
High State (ISource = 0
µA)
Low State (ISink = 500
µA)
NOTE:
1. Tlow = 0°C for MC34129
–40°C for MC33129
Thigh = +70°C for MC34129
+85°C for MC33129
Symbol
Min
Typ
Max
Unit
Vref
1.225
2.375
Vref
1.200
2.250
Regline
–
–
Regload
–
–
1.0
3.0
12
25
2.0
10
12
50
–
–
1.300
2.750
1.250
2.500
1.275
2.625
V
V
mV
mV
VIO
–
–
IIO
IIB
–
–
VICR
AVOL
GBW
PSRR
ISource
VOH
VOL
–
65
500
65
40
1.75
–
25
–
0.5 to 5.5
87
750
85
80
1.96
0.1
–
200
–
–
–
–
–
2.25
0.15
–
1.5
–
10
–
10
–
mV
nA
nA
V
dB
kHz
dB
µA
V
2
MOTOROLA ANALOG IC DEVICE DATA
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Freescale Semiconductor, Inc.
MC34129 MC33129
ELECTRICAL CHARACTERISTICS
(VCC = 10 V, TA = 25°C [Note 1], unless otherwise noted.)
Characteristics
PWM COMPARATOR
Input Offset Voltage (Vin = 1.25 V)
Input Bias Current
Propagation Delay, Ramp Input to Drive Output
SOFT–START
Capacitor Charge Current (Pin 12 = 0 V)
Buffer Input Offset Voltage (Vin = 1.25 V)
Buffer Output Voltage (ISink = 100
µA)
FAULT TIMER
Restart Delay Time
START/RUN COMPARATOR
tDLY
200
400
600
µs
Ichg
VIO
VOL
0.75
–
–
1.2
15
0.15
1.50
40
0.225
µA
mV
V
VIO
IIB
tPLH(IN/DRV)
150
–
–
275
–120
250
400
–250
–
mV
µA
ns
Symbol
Min
Typ
Max
Unit
Freescale Semiconductor, Inc...
Threshold Voltage (Pin 12)
Threshold Hysteresis Voltage (Pin 12)
Output Voltage (ISink = 500
µA)
Output Off–State Leakage Current (VOH = 15 V)
Output Zener Voltage (IZ = 10 mA)
OSCILLATOR
Frequency (RT = 25.5 kΩ, CT = 390 pF)
Capacitor CT Discharge Current (Pin 5 = 1.2 V)
Sync Input Current
High State (Vin = 2.0 V)
Low State (Vin = 0.8 V)
Sync Input Resistance
DRIVE OUTPUT
Output Voltage
High State (ISource = 200 mA)
Low State (ISource = 200 mA)
Low State Holding Current
Output Voltage Rise Time (CL = 500 pF)
Output Voltage Fall Time (CL = 500 pF)
Output Pull–Down Resistance
UNDERVOLTAGE LOCKOUT
Startup Threshold
Hysteresis
TOTAL DEVICE
Power Supply Current
RT = 25.5 kΩ, CT = 390 pF, CL = 500 pF
Power Supply Zener Voltage (IZ = 10 mA)
NOTE:
1. Tlow = 0°C for MC34129
–40°C for MC33129
Thigh = +70°C for MC34129
+85°C for MC33129
Vth
VH
VOL
IS/R(leak)
VZ
–
–
9.0
–
–
2.0
350
10
0.4
(VCC + 7.6)
–
–
10.3
2.0
–
V
mV
V
µA
V
fOSC
Idischg
IIH
IIL
Rin
80
240
–
–
12.5
100
350
40
15
32
120
460
125
35
50
kHz
µA
µA
kΩ
V
VOH
VOL
IH
tr
tf
RPD
8.3
–
–
–
–
100
8.9
1.4
225
390
30
225
–
1.8
–
–
–
350
µA
ns
ns
kΩ
Vth
VH
3.0
5.0
3.6
10
4.2
15
V
%
ICC
VZ
1.0
12
2.5
14.3
4.0
–
mA
V
MOTOROLA ANALOG IC DEVICE DATA
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MC34129 MC33129
Figure 1. Timing Resistor versus
Oscillator Frequency
1.0 M
R T , TIMING RESISTOR (
Ω
)
500 k
200 k
100 k
50 k
20 k
10 k
5.0
CT = 5.0 nF
2.0 nF
1.0 nF
500 pF
200 pF
100pF
Figure 2. Output Deadtime versus
Oscillator Frequency
100
%DT, PERCENT OUTPUT DEAD–TIME
2.0 nF
1.0 nF
500 pF
200 pF
100 pF
VCC = 10 V
TA = 25°C
50
CT = 5.0 nF
20
5.0
2.0
1.0
5.0
10
VCC = 10 V
TA = 25°C
20
50
100
200
fOSC, OSCILLATOR FREQUENCY (kHz)
500
10
20
50
100
200
fOSC, OSCILLATOR FREQUENCY (kHz)
500
Freescale Semiconductor, Inc...
∆
f OSC, OSCILLATOR FREQUENCY CHANGE (%)
Figure 3. Oscillator Frequency Change
versus Temperature
A VOL , OPEN LOOP VOLTAGE GAIN (dB)
60
8.0
VCC = 10 V
RT = 25.5 k
CT = 390 pF
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
0
φ
EXCESS PHASE (DEGREES)
,
200 mV/DIV
1.0
µs/DIV
VCC = 10 V
VO = 1.25 V
RL =
∞
TA = 25°C
40
4.0
0
–4.0
–8.0
–55
–25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
Gain
Phase
45
20
90
0
135
–20
1.0 k
10 k
100 k
f, FREQUENCY (Hz)
1.0 M
180
10 M
Figure 5. Error Amp Small–Signal
Transient Response
TA = 25°C
1.05 V
1.5 V
Figure 6. Error Amp Large–Signal
Transient Response
TA = 25°C
1.0 V
20 mV/DIV
1.0 V
0.95 V
0.5 V
0.5
µs/DIV
4
MOTOROLA ANALOG IC DEVICE DATA
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MC34129 MC33129
Figure 7. Error Amp Open Loop DC Gain
versus Load Resistance
V sat , OUTPUT SATURATION VOLTAGE (V)
A VOL, OPEN LOOP VOLTAGE GAIN (dB)
90
1.0
VCC = 10 V
Pins 8 to 9, 6 to 10
Pins 2, 5, 7 to Gnd
TA = 25°C
Figure 8. Error Amp Output Saturation
versus Sink Current
80
0.8
0.6
0.4
0.2
0
0
70
60
50
0
VCC = 10 V
VO = 1.25 V
RL to 1.25 Vref
TA = 25°C
20
40
60
80
RL, OUTPUT LOAD RESISTANCE (kΩ)
100
2.0
4.0
6.0
ISink, OUTPUT SINK CURRENT (mA)
8.0
Freescale Semiconductor, Inc...
Figure 9. Soft–Start Buffer Output Saturation
versus Sink Current
V sat , OUTPUT SATURATION VOLTAGE (V)
V ref , REFERENCE OUTPUT VOLTAGE (V)
1.0
VCC = 10 V
Pins 8 to 9
Pins 2, 5, 7, 10, 12 to Gnd
TA = 25°C
3.2
Figure 10. Reference Output Voltage versus
Supply Voltage
TA = 25°C
2.4
Vref 2.5 V, RL = 2.5 k
0.8
0.6
0.4
0.2
0
1.6
Vref 1.25 V, RL =
∞
0.8
0
100
200
300
400
500
0
0
4.0
8.0
VCC, SUPPLY VOLTAGE (V)
12
16
ISink, OUTPUT SINK CURRENT (µA)
0
VCC = 10 V
–4.0
–8.0
–12
–16
–20
–24
0
2.0
4.0
6.0
8.0
10
+25°C
TA = – 40°C
+85°C
∆
V ref , REFERENCE OUTPUT VOLTAGE CHANGE (mV)
∆
V ref , REFERENCE OUTPUT VOLTAGE CHANGE (mV)
Figure 11. 1.25 V Reference Output Voltage
Change versus Source Current
Figure 12. 2.5 V Reference Output Voltage
Change versus Source Current
0
VCC = 10 V
–4.0
–8.0
–12
–16
–20
–24
0
0.4
0.8
1.2
1.6
2.0
TA = – 40°C
25°C
85°C
Iref, REFERENCE OUTPUT SOURCE CURRENT (mA)
Iref, REFERENCE OUTPUT SOURCE CURRENT (mA)
MOTOROLA ANALOG IC DEVICE DATA
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