19-0723; Rev 1; 11/07
KIT
ATION
EVALU
BLE
AVAILA
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
General Description
The MAX15004A/B/MAX15005A/B high-performance,
current-mode PWM controllers operate at an automo-
tive input voltage range from 4.5V to 40V (load dump).
The input voltage can go down as low as 2.5V after
startup if V
CC
is supplied by an external bias voltage.
The controllers integrate all the building blocks neces-
sary for implementing fixed-frequency isolated/noniso-
lated power supplies. The general-purpose boost,
flyback, forward, and SEPIC converters can be
designed with ease around the MAX15004/MAX15005.
The current-mode control architecture offers excellent
line-transient response and cycle-by-cycle current limit
while simplifying the frequency compensation.
Programmable slope compensation simplifies the
design further. A fast 60ns current-limit response time,
low 300mV current-limit threshold makes the controllers
suitable for high-efficiency, high-frequency DC-DC con-
verters. The devices include an internal error amplifier
and 1% accurate reference to facilitate the primary-side
regulated, single-ended flyback converter or nonisolat-
ed converters.
An external resistor and capacitor network programs
the switching frequency from 15kHz to 500kHz (1MHz for
the MAX15005A/B). The MAX15004A/B/MAX15005A/B
provide a SYNC input for synchronization to an external
clock. The maximum FET-driver duty cycle for the
MAX15004A/B is 50%. The maximum duty cycle can be
set on the MAX15005A/B by selecting the right combi-
nation of RT and CT.
The input undervoltage lockout (ON/OFF) programs the
input-supply startup voltage and can be used to shut-
down the converter to reduce the total shutdown cur-
rent down to 10µA. Protection features include
cycle-by-cycle and hiccup current limit, output overvolt-
age protection, and thermal shutdown.
The MAX15004A/B/MAX15005A/B are available in
space-saving 16-pin TSSOP and thermally enhanced
16-pin TSSOP-EP packages. All devices operate over
the -40°C to +125°C automotive temperature range.
Features
♦
Wide 4.5V to 40V Operating Input Voltage Range
♦
Operates Down to 2.5V (with Bootstrapped V
CC
Bias)
♦
Current-Mode Control
♦
Low 300mV, 5% Accurate Current-Limit Threshold
Voltage
♦
Internal Error Amplifier with 1% Accurate Reference
♦
RC Programmable 4% Accurate Switching
Frequency
♦
Switching Frequency Adjustable from 15kHz to
500kHz (1MHz for the MAX15005A/B)
♦
External Frequency Synchronization
♦
50% (MAX15004) or Adjustable (MAX15005)
Maximum Duty Cycle
♦
Programmable Slope Compensation
♦
10µA Shutdown Current
♦
Cycle-by-Cycle and Hiccup Current-Limit
Protection
♦
Overvoltage and Thermal Shutdown Protection
♦
-40°C to +125°C Automotive Temperature Range
♦
16-Pin TSSOP or 16-Pin Thermally Enhanced
TSSOP-EP Packages
MAX15004/MAX15005
Ordering Information
PART
PIN-
PACKAGE
MAX DUTY
CYCLE
50%
50%
Programmable
Programmable
PKG
CODE
U16E-3
U16-2
U16E-3
U16-2
MAX15004AAUE+
16 TSSOP–EP*
MAX15004BAUE+ 16 TSSOP
MAX15005AAUE+
16 TSSOP–EP*
MAX15005BAUE+ 16 TSSOP
Applications
Automotive
Vacuum Fluorescent Display (VFD) Power
Supply
Isolated Flyback, Forward, Nonisolated SEPIC,
Boost Converters
Note:
All devices are specified over the -40°C to +125°C tem-
perature range.
+Denotes
lead-free package.
*EP
= Exposed pad.
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
MAX15004/MAX15005
ABSOLUTE MAXIMUM RATINGS
IN to SGND.............................................................-0.3V to +45V
IN to PGND.............................................................-0.3V to +45V
ON/OFF to SGND ........................................-0.3V to (V
IN
+ 0.3V)
OVI, SLOPE, RTCT, SYNC, SS, FB, COMP,
CS to SGND .........................................-0.3V to (V
REG5
+ 0.3V)
V
CC
to PGND..........................................................-0.3V to +12V
REG5 to SGND .........................................................-0.3V to +6V
OUT to PGND .............................................-0.3V to (V
CC
+ 0.3V)
SGND to PGND .....................................................-0.3V to +0.3V
V
CC
Sink Current (clamped mode) .....................................35mA
OUT Current (< 10µs transient) ..........................................±1.5A
Continuous Power Dissipation* (T
A
= +70°C)
16-Pin TSSOP-EP (derate 21.3mW/°C
above +70°C)..............................................................1702mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........754mW
Operating Junction Temperature Range ...........-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
*As
per JEDEC51 Standard, Multilayer Board.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
IN
= 14V, C
IN
= 0.1µF, C
VCC
= 0.1µF // 1µF, C
REG5
= 1µF, V
ON/OFF
= 5V, C
SS
= 0.01µF, C
SLOPE
= 100pF, RT = 13.7kΩ, CT =
560pF, SYNC = OVI = FB = CS = 0V, COMP = unconnected, OUT = unconnected. T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C. All voltages are referenced to PGND, unless otherwise noted.) (Note 1) (Figure 5)
PARAMETER
POWER SUPPLY
Input Supply Range
Operating Supply Current
ON/OFF CONTROL
Input-Voltage Threshold
Input-Voltage Hysteresis
Input Bias Current
Shutdown Current
INTERNAL 7.4V LDO (V
CC
)
Output (V
CC
) Voltage Set Point
Line Regulation
UVLO Threshold Voltage
UVLO Hysteresis
Dropout Voltage
Output Current Limit
Internal Clamp Voltage
INTERNAL 5V LDO (REG5)
Output (REG5) Voltage Set Point
Line Regulation
Dropout Voltage
Output Current Limit
I
REG5-ILIM
V
REG5
V
CC
= 7.5V, I
REG5
= 0 to 15mA (sourcing)
V
CC
= 5.5V to 10V
V
CC
= 4.5V, I
REG5
= 15mA (sourcing)
I
REG5
sourcing
4.75
4.95
2
0.25
32
0.5
5.05
V
mV/V
V
mA
I
VCC-ILIM
V
UVLO-VCC
V
HYST-UVLO
V
IN
= 4.5V, I
VCC
= 20mA (sourcing)
I
VCC
sourcing
10.0
V
VCC-CLAMP
I
VCC
= 30mA (sinking)
V
VCC
I
VCC
= 0 to 20mA (sourcing)
V
IN
= 8V to 40V
V
CC
rising
3.15
7.15
7.4
1
3.5
500
0.25
45
10.4
10.8
0.5
3.75
7.60
V
mV/V
V
mV
V
mA
V
V
ON
V
HYST-ON
I
B-ON/OFF
I
SHDN
V
ON/OFF
= 40V
V
ON/OFF
= 0V
10
V
ON/OFF
rising
1.05
1.23
75
0.5
20
1.40
V
mV
µA
µA
V
IN
I
Q
V
IN
= 40V, f
OSC
= 150kHz
4.5
2
40.0
3.1
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 0.1µF, C
VCC
= 0.1µF // 1µF, C
REG5
= 1µF, V
ON/OFF
= 5V, C
SS
= 0.01µF, C
SLOPE
= 100pF, RT = 13.7kΩ, CT =
560pF, SYNC = OVI = FB = CS = 0V, COMP = unconnected, OUT = unconnected. T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C. All voltages are referenced to PGND, unless otherwise noted.) (Note 1) (Figure 5)
PARAMETER
OSCILLATOR (RTCT)
Oscillator Frequency Range
RTCT Peak Trip Level
RTCT Valley Trip Level
RTCT Discharge Current
f
OSC
V
TH,RTCT
V
TL,RTCT
I
DIS,RTCT
V
RTCT
= 2V
RT = 13.7kΩ, CT = 4.7nF,
f
OSC
(typ) = 18kHz
Oscillator Frequency Accuracy
(Note 2)
RT = 13.7kΩ, CT = 560pF,
f
OSC
(typ) = 150kHz
RT = 21kΩ, CT = 100pF,
f
OSC
(typ) = 500kHz
RT = 7kΩ, CT = 100pF,
f
OSC
(typ) = 1MHz
MAX15004A/B
Maximum PWM Duty Cycle
(Note 3)
Minimum On-Time
SYNC Lock-In Frequency Range
(Note 4)
SYNC High-Level Voltage
SYNC Low-Level Voltage
SYNC Input Current
SYNC Minimum Input Pulse Width
ERROR AMPLIFIER/SOFT-START
Soft-Start Charging Current
SS Reference Voltage
SS Threshold for HICCUP Enable
FB Regulation Voltage
V
REF-FB
I
SS
V
SS
V
SS
rising
COMP = FB,
I
COMP
= -500µA to +500µA
COMP = 0.25V to 4.5V,
I
COMP
= -500µA to +500µA,
V
SS
= 0 to 1.5V
V
FB
= 0 to 1.5V
I
COMP-SINK
V
FB
= 1.5V, V
COMP
= 0.25V
1.215
V
SS
= 0V
8
1.215
15
1.228
1.1
1.228
1.240
21
1.240
µA
V
V
V
V
IH-SYNC
V
IL-SYNC
I
SYNC
V
SYNC
= 0 to 5V
-0.5
50
D
MAX
MAX15005A/B,
RT = 13.7kΩ, CT = 560pF,
f
OSC
(typ) = 150kHz
V
IN
= 14V
RT = 13.7kΩ, CT = 560pF,
f
OSC
(typ) = 150kHz
102
2
0.8
+0.5
78.5
80
110
1.30
-4
-4
-5
-7
f
OSC
= 2 x f
OUT
for MAX15004A/B,
f
OSC
= f
OUT
for MAX15005A/B
15
0.55 x V
REG5
0.1 x V
REG5
1.33
1.36
+4
+4
%
+5
+7
50
81.5
170
200
%
1000
kHz
V
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX15004/MAX15005
t
ON-MIN
ns
%f
OSC
V
V
µA
ns
FB Input Offset Voltage
FB Input Current
COMP Sink Current
V
OS-FB
-5
-300
3
5.5
+5
+300
mV
nA
mA
_______________________________________________________________________________________
3
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
MAX15004/MAX15005
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 0.1µF, C
VCC
= 0.1µF // 1µF, C
REG5
= 1µF, V
ON/OFF
= 5V, C
SS
= 0.01µF, C
SLOPE
= 100pF, RT = 13.7kΩ, CT =
560pF, SYNC = OVI = FB = CS = 0V, COMP = unconnected, OUT = unconnected. T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C. All voltages are referenced to PGND, unless otherwise noted.) (Note 1) (Figure 5)
PARAMETER
COMP Source Current
COMP High Voltage
COMP Low Voltage
Open-Loop Gain
Unity-Gain Bandwidth
Phase Margin
COMP Positive Slew Rate
COMP Negative Slew Rate
PWM COMPARATOR
Current-Sense Gain
PWM Propagation Delay to OUT
PWM Comparator Current-Sense
Leading-Edge Blanking Time
CURRENT-LIMIT COMPARATOR
Current-Limit Threshold Voltage
Current-Limit Input Bias Current
ILIMIT Propagation Delay to OUT
ILIM Comparator Current-Sense
Leading-Edge Blanking Time
Number of Consecutive ILIMIT
Events to HICCUP
HICCUP Timeout
SLOPE COMPENSATION (Note 6)
Slope Capacitor Charging
Current
Slope Compensation
Slope Compensation Tolerance
(Note 2)
Slope Compensation Range
I
SLOPE
V
SLOPE
= 100mV
C
SLOPE
= 100pF
C
SLOPE
= 100pF
C
SLOPE
= 22pF
C
SLOPE
= 1000pF
-4
110
2.5
9.8
10.5
25
+4
11.2
µA
mV/µs
%
mV/µs
V
ILIM
I
B-CS
t
PD-ILIM
OUT= high, 0
≤
V
CS
≤
0.3V
From CS rising above V
ILIM
(50mV
overdrive) to OUT falling (excluding
leading-edge blanking time)
290
-2
60
305
317
+2
mV
µA
ns
A
CS-PWM
t
PD-PWM
∆V
COMP
/
∆V
CS
(Note 5)
CS = 0.15V, from V
COMP
falling edge:
3V to 0.5V to OUT falling (excluding
leading-edge blanking time)
2.85
3
60
3.15
V/V
ns
SYMBOL
I
COMP-
SOURCE
CONDITIONS
V
FB
= 1V, V
COMP
= 4.5V
V
FB
= 1V, I
COMP
= 1mA (sourcing)
V
FB
= 1.5V, I
COMP
= 1mA (sinking)
MIN
1.3
V
REG5
- 0.5
TYP
2.8
V
REG5
- 0.2
0.1
100
1.6
75
0.5
-0.5
MAX
UNITS
mA
V
V
OH-COMP
V
OL-COMP
A
EAMP
UGF
EAMP
PM
EAMP
SR+
SR-
0.25
V
dB
MHz
degrees
V/µs
V/µs
t
CS-BLANK
50
ns
t
CS-BLANK
50
7
512
ns
Clock
periods
4
_______________________________________________________________________________________
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 0.1µF, C
VCC
= 0.1µF // 1µF, C
REG5
= 1µF, V
ON/OFF
= 5V, C
SS
= 0.01µF, C
SLOPE
= 100pF, RT = 13.7kΩ, CT =
560pF, SYNC = OVI = FB = CS = 0V, COMP = unconnected, OUT = unconnected. T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C. All voltages are referenced to PGND, unless otherwise noted.) (Note 1) (Figure 5)
PARAMETER
OUTPUT DRIVER
R
OUT-N
Driver Output Impedance
R
OUT-P
Driver Peak Output Current
OVERVOLTAGE COMPARATOR
Overvoltage Comparator Input
Threshold
Overvoltage Comparator
Hysteresis
Overvoltage Comparator Delay
OVI Input Current
THERMAL SHUTDOWN
Shutdown Temperature
Thermal Hysteresis
T
SHDN
T
HYST
Temperature rising
160
15
o
o
MAX15004/MAX15005
SYMBOL
CONDITIONS
V
CC
= 8V (applied externally),
I
OUT
= 100mA (sinking)
V
CC
= 8V (applied externally),
I
OUT
= 100mA (sourcing)
C
OUT
= 10nF, sinking
C
OUT
= 10nF, sourcing
MIN
TYP
MAX
UNITS
1.7
3
1000
750
3.5
Ω
5
mA
I
OUT-PEAK
V
OV-TH
V
OV-HYST
TD
OVI
I
OVI
V
OVI
rising
1.20
1.228
125
1.26
V
mV
µs
From OVI rising above 1.228V to OUT
falling, with 50mV overdrive
V
OVI
= 0 to 5V
-0.5
1.6
+0.5
µA
C
C
Note 1:
100% production tested at +125°C. Limits over the temperature range are guaranteed by design.
Note 2:
Not production tested, guaranteed by design.
Note 3:
For the MAX15005A/B, D
MAX
depends upon the value of RT. See Figure 3 and the
Oscillator Frequency/External
Synchronization
section.
Note 4:
The external SYNC pulse triggers the discharge of the oscillator ramp. See Figure 2. During external SYNC, D
MAX
= 50% for
the MAX15004A/B; for the MAX15005A/B, there is a shift in D
MAX
with f
SYNC
/f
OSC
ratio (see the
Oscillator Frequency/
External Synchronization
section).
Note 5:
The parameter is measured at the trip point of latch, with 0
≤
V
CS
≤
0.3V, and FB = COMP.
Note 6:
Slope compensation = (2.5 x 10
-9
) / C
SLOPE
mV/µs. See the
Applications Information
section.
_______________________________________________________________________________________
5
京公网安备 11010802033920号
EEWORLD
