Motorola MC34129D, MC33129D, MC34129P Datasheet
SEMICONDUCTOR
TECHNICAL DATA
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
PIN CONNECTIONS
Order this document by MC34129/D
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
P SUFFIX
PLASTIC PACKAGE
CASE 646
14
1
14
1
(Top View)
Drive Output
Drive Ground
Ramp Input
Sync/Inhibit
Input
RT/C
T
V
ref
2.5 V
Gnd
1
2
3
4
5
6
78
9
10
11
12
13
14 V
CC
Start/Run Output
C
Soft–Start
Feedback/
PWM Input
Error Amp
Inverting Input
Error Amp
Noninverting Input
V
ref
1.25 V
Device
Operating
Temperature Range
Package
ORDERING INFORMATION
MC34129D
MC34129P
TA = 0° to +70°C
SO–14
Plastic DIP
MC33129D
MC33129P
SO–14
Plastic DIP
TA = –40° to +85°C
1
MOTOROLA ANALOG IC DEVICE DATA
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
• 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
Simplified Block Diagram
+
–
Soft–Start
and
Fault Timer
Start/Run
Undervoltage
Lockout
1.25V
Reference
Error Amp
Latching
PWM
X2
Oscillator
12
7
6
5
4
C
Soft–Start
Gnd
V
ref
2.5V
RT/C
T
Sync/Inhibit
Input
13
14
8
9
10
11
1
2
3
Start/Run
Output
V
CC
V
ref
1.25V
Noninverting
Input
Inverting
Input
Feedback/
PWM Input
Drive Out
Drive Gnd
Ramp Input
Motorola, Inc. 1996 Rev 1
MC34129 MC33129
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating Symbol Value Unit
VCC Zener Current I
Z(VCC)
50 mA
Start/Run Output Zener Current I
Z(Start/Run)
50 mA
Analog Inputs (Pins 3, 5, 9, 10, 11, 12) – –0.3 to 5.5 V
Sync Input Voltage V
sync
–0.3 to V
CC
V
Drive Output Current, Source or Sink I
DRV
1.0 A
Current, Reference Outputs (Pins 6, 8) I
ref
20 mA
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
P
D
R
θJA
P
D
R
θJA
552
145
800
100
mW
°C/W
mW
°C/W
Operating Junction Temperature T
J
+150 °C
Operating Ambient Temperature
MC34129
MC33129
T
A
0 to +70
–40 to +85
°C
Storage Temperature Range T
stg
–65 to +150 °C
ELECTRICAL CHARACTERISTICS (V
CC
= 10 V, TA = 25°C [Note 1], unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
REFERENCE SECTIONS
Reference Output Voltage, TA = 25°C
1.25 V Ref., IL = 0 mA
2.50 V Ref., IL = 1.0 mA
V
ref
1.225
2.375
1.250
2.500
1.275
2.625
V
Reference Output Voltage, TA = T
low
to T
high
1.25 V Ref., IL = 0 mA
2.50 V Ref., IL = 1.0 mA
V
ref
1.200
2.250
–
–
1.300
2.750
V
Line Regulation (VCC = 4.0 V to 12 V)
1.25 V Ref., IL = 0 mA
2.50 V Ref., IL = 1.0 mA
Reg
line
–
–
2.0
10
12
50
mV
Load Regulation
1.25 V Ref., IL = –10 µA to +500 µA
2.50 V Ref., IL = –0.1 mA to +1.0 mA
Reg
load
–
–
1.0
3.0
12
25
mV
ERROR AMPLIFIER
Input Offset Voltage (Vin = 1.25 V)
TA = 25°C
TA = T
low
to T
high
V
IO
–
–
1.5
–
–
10
mV
Input Offset Current (Vin = 1.25 V) I
IO
– 10 – nA
Input Bias Current (Vin = 1.25 V)
TA = 25°C
TA = T
low
to T
high
I
IB
–
–
25
–
–
200
nA
Input Common Mode Voltage Range V
ICR
– 0.5 to 5.5 – V
Open Loop Voltage Gain (VO = 1.25 V) A
VOL
65 87 – dB
Gain Bandwidth Product (VO = 1.25 V, f = 100 kHz) GBW 500 750 – kHz
Power Supply Rejection Ratio (VCC = 5.0 V to 10 V) PSRR 65 85 – dB
Output Source Current (VO = 1.5 V) I
Source
40 80 – µA
Output Voltage Swing
High State (I
Source
= 0 µA)
Low State (I
Sink
= 500 µA)
V
OH
V
OL
1.75
–
1.96
0.1
2.25
0.15
V
NOTE: 1.T
low
=0°C for MC34129 T
high
= +70°C for MC34129
–40°C for MC33129 +85°C for MC33129
MC34129 MC33129
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (V
CC
= 10 V, TA = 25°C [Note 1], unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
PWM COMPARATOR
Input Offset Voltage (Vin = 1.25 V) V
IO
150 275 400 mV
Input Bias Current I
IB
– –120 –250 µA
Propagation Delay , Ramp Input to Drive Output t
PLH(IN/DRV)
– 250 – ns
SOFT–START
Capacitor Charge Current (Pin 12 = 0 V) I
chg
0.75 1.2 1.50 µA
Buffer Input Offset Voltage (Vin = 1.25 V) V
IO
– 15 40 mV
Buffer Output Voltage (I
Sink
= 100 µA) V
OL
– 0.15 0.225 V
FAULT TIMER
Restart Delay Time t
DLY
200 400 600 µs
START/RUN COMPARATOR
Threshold Voltage (Pin 12) V
th
– 2.0 – V
Threshold Hysteresis Voltage (Pin 12) V
H
– 350 – mV
Output Voltage (I
Sink
= 500 µA) V
OL
9.0 10 10.3 V
Output Off–State Leakage Current (VOH = 15 V) I
S/R(leak)
– 0.4 2.0 µA
Output Zener Voltage (IZ = 10 mA) V
Z
– (VCC + 7.6) – V
OSCILLATOR
Frequency (RT = 25.5 kΩ, CT = 390 pF) f
OSC
80 100 120 kHz
Capacitor CT Discharge Current (Pin 5 = 1.2 V) I
dischg
240 350 460 µ A
Sync Input Current
High State (Vin = 2.0 V)
Low State (Vin = 0.8 V)
I
IH
I
IL
–
–
40
15
125
35
µA
Sync Input Resistance R
in
12.5 32 50 kΩ
DRIVE OUTPUT
Output Voltage
High State (I
Source
= 200 mA)
Low State (I
Source
= 200 mA)
V
OH
V
OL
8.3
–
8.9
1.4
–
1.8
V
Low State Holding Current I
H
– 225 – µA
Output Voltage Rise T ime (CL = 500 pF) t
r
– 390 – ns
Output Voltage Fall T ime (CL = 500 pF) t
f
– 30 – ns
Output Pull–Down Resistance R
PD
100 225 350 kΩ
UNDERVOLTAGE LOCKOUT
Startup Threshold V
th
3.0 3.6 4.2 V
Hysteresis V
H
5.0 10 15 %
TOTAL DEVICE
Power Supply Current
RT = 25.5 kΩ, CT = 390 pF, CL = 500 pF
I
CC
1.0 2.5 4.0 mA
Power Supply Zener Voltage (IZ = 10 mA) V
Z
12 14.3 – V
NOTE: 1.T
low
=0°C for MC34129 T
high
= +70°C for MC34129
–40°C for MC33129 +85°C for MC33129
MC34129 MC33129
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Timing Resistor versus
Oscillator Frequency
Figure 2. Output Deadtime versus
Oscillator Frequency
Figure 3. Oscillator Frequency Change
versus Temperature
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 5. Error Amp Small–Signal
Transient Response
Figure 6. Error Amp Large–Signal
Transient Response
0.5 µs/DIV
20 mV/DIV
200 mV/DIV
1.0 µs/DIV
TA = 25°C
f
OSC
, OSCILLATOR FREQUENCY (kHz)
R
T
, TIMING RESISTOR ( )
Ω
CT = 5.0 nF 2.0 nF 1.0 nF 500 pF 200 pF
100pF
∆
f
OSC
, OSCILLATOR FREQUENCY CHANGE (%)
TA, AMBIENT TEMPERATURE (°C)
VCC = 10 V
RT = 25.5 k
CT = 390 pF
f
OSC
, OSCILLATOR FREQUENCY (kHz)
%DT, PERCENT OUTPUT DEAD–TIME
CT = 5.0 nF
2.0 nF 1.0 nF 200 pF
100 pF
f, FREQUENCY (Hz)
A
VOL
, OPEN LOOP VOL TAGE GAIN (dB)
0
45
90
135
180
, EXCESS PHASE (DEGREES)
φ
Gain
Phase
TA = 25°C
5.0 10 20 50 100 200 500
–55 –25 0 25 50 75 100 125
5.0 10 20 50 100 200 500
1.0 k 10 k 100 k 1.0 M 10 M
1.05 V
1.0 V
0.95 V
1.5 V
1.0 V
0.5 V
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
8.0
4.0
0
–4.0
–8.0
100
50
20
5.0
2.0
1.0
60
40
20
0
–20
VCC = 10 V
TA = 25
°
C
VCC = 10 V
TA = 25
°
C
500 pF
VCC = 10 V
VO = 1.25 V
RL =
∞
TA = 25°C
MC34129 MC33129
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 7. Error Amp Open Loop DC Gain
versus Load Resistance
Figure 8. Error Amp Output Saturation
versus Sink Current
Figure 9. Soft–Start Buffer Output Saturation
versus Sink Current
Figure 10. Reference Output Voltage versus
Supply Voltage
Figure 11. 1.25 V Reference Output Voltage
Change versus Source Current
Figure 12. 2.5 V Reference Output Voltage
Change versus Source Current
RL, OUTPUT LOAD RESISTANCE (kΩ)
A
VOL
, OPEN LOOP VOL TAGE GAIN (dB)
VCC = 10 V
VO = 1.25 V
RL to 1.25 V
ref
TA = 25
°
C
I
Sink
, OUTPUT SINK CURRENT (mA)
V
sat
, OUTPUT SA TURATION VOLTAGE (V)
VCC = 10 V
Pins 8 to 9, 6 to 10
Pins 2, 5, 7 to Gnd
TA = 25
°
C
V
sat
, OUTPUT SA TURATION VOLTAGE (V)
I
Sink
, OUTPUT SINK CURRENT (µA) VCC, SUPPLY VOLTAGE (V)
V
ref
, REFERENCE OUTPUT VOLTAGE (V)
TA = 25°C
V
ref
2.5 V, RL = 2.5 k
I
ref
, REFERENCE OUTPUT SOURCE CURRENT (mA)
∆
V
ref
, REFERENCE OUTPUT VOLTAGE CHANGE (mV)
TA = – 40°C
VCC = 10 V
+85
°
C
+25
°
C
I
ref
, REFERENCE OUTPUT SOURCE CURRENT (mA)
∆
V
ref
, REFERENCE OUTPUT VOLTAGE CHANGE (mV)
TA = – 40°C
VCC = 10 V
85°C25°C
90
80
70
60
50
1.0
0.8
0.6
0.4
0.2
0
1.0
0.8
0.6
0.4
0.2
0
3.2
2.4
1.6
0.8
0
0
–4.0
–8.0
–12
–16
–20
–24
0
–4.0
–8.0
–12
–16
–20
–24
0 20 40 60 80 100 0 2.0 4.0 6.0 8.0
0 100 200 300 400 500 0 4.0 8.0 12 16
0 2.0 4.0 6.0 8.0 10 0 0.4 0.8 1.2 1.6 2.0
VCC = 10 V
Pins 8 to 9
Pins 2, 5, 7, 10, 12 to Gnd
TA = 25
°
C
V
ref
1.25 V, RL =
∞
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