MAX603C/D [MAXIM]
5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear Regulators; 5V / 3.3V或可调，低压差，低IQ ， 500mA线性稳压器
| 型号： | MAX603C/D |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear Regulators |
| 文件： | 总12页 (文件大小：135K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0269; Rev 0; 9/94
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
3/MAX604
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
The MAX603/MAX604 low-dropout, low quiescent cur-
rent, linear regulators supply 5V, 3.3V, or an adjustable
output for currents up to 500mA. They are available in a
1.8W SO package. Typical dropouts are 320mV at 5V
and 500mA, or 240mV at 3.3V and 200mA. Quiescent
currents are 15µA typ and 35µA max. Shutdown turns
off all circuitry and puts the regulator in a 2µA off mode.
A unique protection scheme limits reverse currents
when the input voltage falls below the output. Other fea-
ture s inc lud e foldb a c k c urre nt limiting a nd the rma l
overload protection.
♦ 500mA Output Current, with Foldback Current
Limiting
♦ High-Power (1.8W) 8-Pin SO Package
♦ Dual Mode™ Operation: Fixed or Adjustable
Output from 1.25V to 11V
♦ Large Input Range (2.7V to 11.5V)
♦ Internal 500mA P-Channel Pass Transistor
♦ 15µA Typical Quiescent Current
♦ 2µA (Max) Shutdown Mode
♦ Thermal Overload Protection
♦ Reverse-Current Protection
The output is preset at 3.3V for the MAX604 and 5V for
the MAX603. In addition, both devices employ Dual
Mode™ operation, allowing user-adjustable outputs
from 1.25V to 11V using external resistors. The input
voltage supply range is 2.7V to 11.5V.
______________Ord e rin g In fo rm a t io n
The MAX603/MAX604 fe a ture a 500mA P-c ha nne l
MOSFET p a s s tra ns is tor. This tra ns is tor a llows the
devices to draw less than 35µA over temperature, inde-
p e nd e nt of the outp ut c urre nt. The s up p ly c urre nt
remains low because the P-channel MOSFET pass tran-
sistor draws no base currents (unlike the PNP transis-
tors of conventional bipolar linear regulators). Also,
when the input-to-output voltage differential becomes
small, the internal P-channel MOSFET does not suffer
from excessive base current losses that occur with sat-
urated PNP transistors.
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX603CPA
MAX603CSA
MAX603C/D
MAX603EPA
MAX603ESA
MAX603MJA
MAX604CPA
MAX604CSA
MAX604C/D
MAX604EPA
MAX604ESA
MAX604MJA
0°C to +70°C
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
8 Plastic DIP
8 SO
8 CERDIP**
8 Plastic DIP
8 SO
0°C to +70°C
0°C to +70°C
Dice*
________________________Ap p lic a t io n s
5V and 3.3V Regulators
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
1.25V to 11V Adjustable Regulators
Battery-Powered Devices
8 CERDIP**
* Dice are tested at T = +25°C, DC parameters only.
A
** Contact factory for availability.
Pagers and Cellular Phones
Portable Instruments
Solar-Powered Instruments
__________Typ ic a l Op e ra t in g Circ u it
__________________P in Co n fig u ra t io n
TOP VIEW
OUT
IN
OUTPUT
VOLTAGE
MAX603
MAX604
IN
GND
GND
OFF
OUT
GND
GND
SET
1
2
3
4
8
7
6
5
OFF
C
IN
C
10µF
MAX603
MAX604
BATTERY
OUT
10µF
GND
SET
DIP/SO
™ Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (IN or OUT to GND).......................-0.3V to +12V
Output Short-Circuit Duration ..............................................1 min
Continuous Output Current...............................................600mA
SET, OFF Input Voltages ...........................-0.3V to the greater of
(IN + 0.3V) or (OUT + 0.3V)
Operating Temperature Ranges
MAX60_C_A........................................................0°C to +70°C
MAX60_E_A .....................................................-40°C to +85°C
MAX60_MJA ..................................................-55°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Continuous Power Dissipation (T = +70°C)
A
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 23.6mW/°C above +70°C).............................1.8W
CERDIP (derate 8.00mW/°C above +70°C).................640mW
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 = 6V (MAX603) or 4.3V (MAX604), C = C
= 10µF, OFF = V , SET = GND, T = T
to T , unless otherwise noted.
MAX
IN
IN
OUT
IN
J
MIN
3/MAX604
Typical values are at T = +25°C.) (Note 1)
J
PARAMETER
SYMBOL
CONDITIONS
MIN
2.7
2.9
3.0
TYP
MAX
11.5
11.5
11.5
UNITS
MAX60_C
MAX60_E
MAX60_M
Input Voltage
V
IN
SET = OUT, R = 1kΩ
V
L
I
= 20µA to 500mA,
OUT
MAX603
MAX604
4.75
3.15
5.00
5.25
3.45
6.0V < V < 11.5V
IN
Output Voltage (Note 2)
V
OUT
V
I
= 20µA to 300mA,
OUT
3.30
60
4.3V < V < 11.5V
IN
MAX603C/E
MAX603M
MAX604
100
150
100
40
I
= 1mA to 500mA
= 1mA to 300mA
OUT
Load Regulation
Line Regulation
∆V
mV
mV
LDR
I
30
7
OUT
∆V
(V
+ 0.5V) ≤ V ≤ 11.5V, I
= 25mA
LNR
OUT
IN
OUT
I
= 200mA
= 500mA
= 200mA
= 400mA
130
320
240
480
15
220
550
410
820
35
OUT
MAX603
MAX604
I
OUT
Dropout Voltage (Note 3)
∆V
mV
DO
I
OUT
I
OUT
MAX60_C/E
MAX60_M
MAX60_C
MAX60_E
MAX60_M
MAX60_C
MAX60_E
MAX60_M
Quiescent Current
I
3.0V ≤ V ≤ 11.5V, SET = OUT
µA
µA
Q
IN
40
0.01
2
OFF ≤ 0.4V, R = 1kΩ,
(V
L
OFF Quiescent Current
I
10
Q OFF
+ 1V) ≤ V ≤ 11.5V
OUT
IN
20
2
Minimum Load Current
I
V
= 11.5V, SET = OUT
6
µA
OUT MIN
IN
20
V
< 0.8V
350
1200
160
10
OUT
Foldback Current Limit
(Note 4)
I
mA
LIM
V
OUT
> 0.8V and V - V
> 0.7V
IN
OUT
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T
°C
°C
SD
∆T
SD
2
_______________________________________________________________________________________
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
3/MAX604
ELECTRICAL CHARACTERISTICS (continued)
(V = 6V (MAX603) or 4.3V (MAX604), C = C
= 10µF, OFF = V , SET = GND, T = T
to T , unless otherwise noted.
MAX
IN
IN
OUT
IN
J
MIN
Typical values are at T = +25°C.) (Note 1)
J
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
6
MAX
20
UNITS
V
= 4.5V
= 3.0V
MAX603
MAX604
OUT
Reverse-Current Protection
Threshold (Note 5)
∆V
mV
RTH
V
OUT
6
20
MAX60_C
MAX60_E
MAX60_M
0.01
10
V
V
OUT
= 0V, V
= 3.0V (MAX604)
= 4.5V (MAX603)
IN
OUT
Reverse Leakage Current
I
20
µA
RVL
100
Start-Up Overshoot
V
OSH
R
= 1kΩ, C = 10µF, OFF rise time ≤ 1µs
OUT
2
%V
OUT
L
V
= 9V, R = 18Ω, V
switched from
OFF
IN
L
Time Required to Exit Shutdown
t
200
µs
START
0V to V , time from 0% to 95% of V
OUT
IN
For internal feedback
For external feedback
80
80
30
Dual-Mode SET Threshold
V
SET TH
mV
150
SET Reference Voltage
V
SET = OUT, R = 1kΩ
1.16
1.20
±0.01
0.01
1.24
±10
2
V
SET
L
SET Input Leakage Current
I
V
SET
= 1.5V or 0V
nA
SET
MAX60_C
MAX60_E
MAX60_M
V
IN
= 11.5V, V
= 2V,
OUT
OUT Leakage Current
OFF Threshold Voltage
I
6
µA
OUT LKG
SET = OUT
20
V
IL OFF
Off
0.4
On, SET = OUT, V = 4V
2.0
3.0
4.0
IN
V
V
IH OFF
On, SET = OUT, V = 6V
IN
On, SET = OUT, V = 11.5V
IN
OFF Input Leakage Current
Output Noise (Note 6)
I
V
= V or GND
±0.01
250
±10
nA
OFF
OFF
IN
10Hz to 10kHz, SET = OUT, R = 1kΩ,
C
L
e
µV
RMS
n
= 10µF
OUT
Note 1: Electrical specifications are measured by pulse testing and are guaranteed for a junction temperature (T ) equal to the
J
operating temperature range. C and E grade parts may be operated up to a T of +125°. Expect performance similar to
J
M grade specifications. For T between +125°C and +150°C, the output voltage may drift more.
J
Note 2: (V - V
) is limited to keep the product (I
x (V - V
)) from exceeding the package power dissipation limits.
OUT
IN
OUT
OUT
IN
Note 3: Dropout Voltage is (V - V
) when V
falls to 100mV below its nominal value at V = V
+ 2V. For example, the
IN
OUT
OUT
IN
OUT
MAX603 is tested by measuring the V
at V = 7V, then V is lowered until V
falls 100mV below the measured value.
OUT
IN
IN
OUT
The difference (V - V
) is then measured and defined as ∆V
.
IN
OUT
DO
Note 4: Foldback Current Limit was characterized by pulse testing to remain below the maximum junction temperature.
Note 5: The Reverse-Current Protection Threshold is the output/input differential voltage (V - V ) at which reverse-current
OUT
IN
protection switchover occurs and the pass transistor is turned off.
Note 6: Noise is tested using a bandpass amplifier with two poles at 10Hz and two poles at 10kHz.
_______________________________________________________________________________________
3
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = 7V for MAX603, V = 5.3V for MAX604, OFF = V , SET = GND, C = C
= 10µF, R = 1kΩ, T = +25°C, unless otherwise noted.)
L J
IN
IN
IN
IN
OUT
OUTPUT VOLTAGE AND
QUIESCENT CURRENT vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE vs. LOAD CURRENT
QUIESCENT CURRENT vs. LOAD CURRENT
24
6
1.01
30
25
22
20
18
16
14
12
MAX603, V
= 5V
OUT
1.00
0.99
0.98
0.97
0.96
0.95
5
4
MAX603, V = 12V, V
= 10V
IN
OUT
20
15
10
5
MAX604, V
= 3.3V
OUT
MAX603, V = 7V, V
= 5V
IN
OUT
3
2
MAX604, V = 5.3V, V
= 3.3V
IN
OUT
V
= 3.3V, 5V, 10V
OUT
10
8
NORMALIZED TO
OUTPUT VOLTAGE
AT 1mA
1
0
UPWARD CURVE IS
THERMAL EFFECT
3/MAX604
0
6
0.1
1
10
100
700
3
5
7
9
11
10 12
0.1
1
10
100
700
2
4
6
8
LOAD CURRENT (mA)
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
QUIESCENT CURRENT vs.
TEMPERATURE
OUTPUT VOLTAGE vs.
TEMPERATURE
DROPOUT VOLTAGE vs. LOAD CURRENT
25
0.9
0.8
104
103
102
MAX604
V
OUT
= 3.3V
MAX603
20
15
0.7
0.6
0.5
MAX604
101
MAX603
= 5V
V
OUT
100
99
98
97
96
0.4
10
5
0.3
0.2
0.1
0
MAX603, V
SET EXTERNALLY
= 10V,
OUT
0
-55 -35 -15
5
25 45 65 85 105 125
0
100 200 300 400 500 600 700
LOAD CURRENT (mA)
-55 -35 -15
5
25 45 65 85 105 125
TEMPERATURE (°C)
TEMPERATURE (°C)
LINE-TRANSIENT RESPONSE
10Hz TO 10kHz OUTPUT NOISE
A
B
MAX603
= 5V
t = 10µs, t = 70µs
R
V
MAX603
= 5V
OUT
V
F
OUT
2ms/div
A: V = 8V (HIGH), V = 7V (LOW)
10ms/div
IN
IN
B: OUTPUT VOLTAGE (50mV/div)
4
_______________________________________________________________________________________
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
3/MAX604
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = 7V for MAX603, V = 5.3V for MAX604, OFF = V , SET = GND, C = C
= 10µF, R = 1kΩ, T = +25°C, unless otherwise noted.)
L J
IN
IN
IN
IN
OUT
OVERSHOOT AND TIME
LOAD-TRANSIENT RESPONSE
EXITING SHUTDOWN MODE
B
A
5V
A
B
MAX603
= 5V
0V
V
OUT
2ms/div
500µs/div
A: OFF PIN VOLTAGE (1V/div)
RISE TIME = 13µs
B: MAX603 OUTPUT VOLTAGE (1V/div)
A: OUTPUT VOLTAGE (100mV/div)
B: I = 500mA (HIGH), I = 5mA (LOW)
OUT
OUT
DELAY = 4.936ms, OVERSHOOT = 1%, RISE TIME = 55µs
______________________________________________________________P in De s c rip t io n
PIN
NAME
DESCRIPTION
1
IN
Regulator Input. Supply voltage can range from 2.7V to 11.5V.
Ground. These pins function as heatsinks, only in the SOIC package. All GND pins must be soldered to the
circuit board for proper power dissipation. Connect to large copper pads or planes to channel heat from the IC.
2, 3, 6, 7
GND
OFF
SET
OUT
4
5
8
Shutdown, active low. Switch logic levels in less than 1µs with the high level above the OFF threshold.
Feedback for Setting the Output Voltage. Connect to GND to set the output voltage to the preselected 3.3V
or 5V. Connect to an external resistor network for adjustable output operation.
Regulator Output. Fixed or adjustable from 1.25V to 11.0V. Sources up to 500mA for input voltages above 4V.
8
1
2
3
OUT
GND
GND
IN
V
OUT
MAX603
MAX604
7
6
GND
V
IN
R1
R2
GND
OFF
C
10µF
OUT
R
L
C
IN
4
5
10µF
SET
Figure 1. Test Circuit
_______________________________________________________________________________________
5
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
IN
SHUTDOWN
MOSFET DRIVER
WITH FOLDBACK
CURRENT LIMIT
REVERSE
CURRENT
PROTECTION
P
ERROR AMP
SHUTDOWN
LOGIC
OFF
OUT
SET
R1
3/MAX604
1.20V
REFERENCE
DUAL-MODE
COMPARATOR
THERMAL
SENSOR
R2
80mV
MAX603
MAX604
GND
Figure 2. Functional Diagram
The output voltage is fed back through either an internal
resistor voltage divider connected to the OUT pin, or an
external resistor network connected to the SET pin. The
dual-mode comparator examines the SET voltage and
selects the feedback path used. If SET is below 80mV,
internal feedback is used and the output voltage is regulat-
e d to 5V for the MAX603 or 3.3V for the MAX604.
Additional blocks include a foldback current limiter, reverse
current protection, thermal sensor, and shutdown logic.
_______________De t a ile d De s c rip t io n
The MAX603/MAX604 are low-dropout, low-quiescent-
current linear regulators designed primarily for battery-
powered applications. They supply an adjustable 1.25V
to 11V output or a preselected 5V (MAX603) or 3.3V
(MAX604) output for load currents up to 500mA. As
illustrated in Figure 2, they consist of a 1.20V reference,
error amplifier, MOSFET driver, P-channel pass transis-
tor, dual-mode comparator, and internal feedback volt-
age divider.
In t e rn a l P -Ch a n n e l P a s s Tra n s is t o r
The MAX603/MAX604 fe a ture a 500mA P-c ha nne l
MOSFET pass transistor. This provides several advan-
tages over similar designs using PNP pass transistors,
including longer battery life.
The 1.20V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the selected feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the P-
channel pass transistor. If the feedback voltage is lower
than the reference, the pass transistor gate is pulled
lower, allowing more current to pass and increasing the
output voltage. If the feedback voltage is too high, the
pass transistor gate is pulled up, allowing less current
to pass to the output.
The P-channel MOSFET requires no base drive, which
reduces quiescent current considerably. PNP based
regulators waste considerable amounts of current in
dropout when the pass transistor saturates. They also
use high base-drive currents under large loads. The
MAX603/MAX604 do not suffer from these problems
and consume only 15µA of quiescent current under
light and heavy loads, as well as in dropout.
6
_______________________________________________________________________________________
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
3/MAX604
Ou t p u t Vo lt a g e S e le c t io n
The MAX603/MAX604 feature dual-mode operation. In
OUTPUT
preset voltage mode, the output of the MAX603 is set to
5V and the output of the MAX604 is set to 3.3V using
internal, trimmed feedback resistors. Select this mode
by connecting SET to ground.
VOLTAGE
OUT
SET
IN
MAX603
MAX604
R1
R2
OFF
C
10µF
R
L
In adjustable mode, an output between 1.25V and 11V
is selected using two external resistors connected as a
voltage divider to SET (Figure 3). The output voltage is
set by the following equation:
OUT
C
IN
BATTERY
0.1µF to
10µF
GND
R1
V
= V
1 +
OUT
SET
R2
= 1.20V. To simplify resistor selection:
where V
SET
Figure 3. Adjustable Output Using External Feedback Resistors
V
OUT
R1 = R2
- 1
V
SET
> 0.7V. For VIN - VOUT < 0.7V (dropout operation), there
is no current limit. If the output voltage drops below
0.8V, implying a short-circuit condition, the output cur-
rent is limited to 350mA. The output can be shorted to
ground for one minute without damaging the device if
the p a c ka g e c a n d is s ip a te VIN x 350mA without
exceeding TJ = +150°C.
Since the input bias current at SET is nominally zero,
large resistance values can be used for R1 and R2 to
minimize power consumption without losing accuracy. Up
to 1.5MΩ is acceptable for R2. Since the V
tolerance
SET
is less than ±40mV, the output can be set using fixed
resistors instead of trim pots.
In preset voltage mode, impedances between SET and
ground should be less than 10kΩ. Otherwise, spurious
conditions could cause the voltage at SET to exceed
the 80mV dual-mode threshold.
Th e rm a l Ove rlo a d P ro t e c t io n
Thermal overload protection limits total power dissipa-
tion in the MAX603/MAX604. When the junction temper-
ature exceeds TJ = +160°C, the thermal sensor sends a
signal to the shutdown logic, turning off the pass tran-
sistor and allowing the IC to cool. The thermal sensor
will turn the pass transistor on again after the IC’s junc-
tion temperature cools by 10°C, resulting in a pulsed
output during thermal overload conditions.
S h u t d o w n
A low input on the OFF pin shuts down the MAX603/
MAX604. In the off mode, the pass transistor, control
circuit, reference, and all biases are turned off, reduc-
ing the supply current below 2µA. OFF should be con-
nected to IN for normal operation.
Thermal overload protection is designed to protect the
MAX603/MAX604 in the event of fault conditions. For
continual operation, the absolute maximum junction tem-
Use a fast comparator, Schmitt trigger, or CMOS or TTL
logic to drive the OFF pin in and out of shutdown. Rise
times should be shorter than 1µs. Do not use slow RC
circuits, leave OFF open, or allow the input to linger
between thresholds; these measures will prevent the
outp ut from jump ing to the p os itive s up p ly ra il in
response to an indeterminate input state.
perature rating of T = +150°C should not be exceeded.
J
Op e ra t in g Re g io n a n d P o w e r Dis s ip a t io n
Maximum power dissipation of the MAX603/MAX604
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
Since the OFF threshold varies with input supply volt-
age (see Electrical Characteristics), do not derive the
drive voltage from 3.3V logic. With V at 11.5V, the
high OFF logic level needs to be above I4NV.
power dissipation across the device is P = IOUT (V
-
IN
VOUT). The resulting maximum power dissipation is:
T
- T
A
(
θ
)
J
Fo ld b a c k Cu rre n t Lim it in g
The MAX603/MAX604 also include a foldback current
limiter. It monitors and controls the pass transistor’s
gate voltage, estimating the output current and limiting
it to 1.2A for output voltages above 0.8V and VIN - VOUT
P
=
MAX
+ θ
(
)
JB
BA
where (TJ - TA) is the temperature difference between
the MAX603/MAX604 die junction and the surrounding
_______________________________________________________________________________________
7
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
MAXIMUM OUTPUT CURRENT vs. SUPPLY VOLTAGE
POWER DISSIPATION vs.
GROUND PAD AREA
MAX603
1.8
1.7
1.6
700
600
500
MAXIMUM CONTINUOUS CURRENT LIMIT
HIGH-POWER
SOIC
1.5
1.4
1.3
1.2
1.1
400
300
200
100
0
MAX603, V
= 5V
OUT
8-PIN SO PACKAGE
PAPER EPOXY BOARD
SINGLE SIDED
PLASTIC DIP
OPERATING
REGION AT
1oz. COPPER
T
J
= +125°C
T = +25°C
CERAMIC DIP
10 11 12 13
A
T = +25°C STILL AIR
A
T = +125°C
J
1.0
2
0.2
1.3
1
6.5
10
20 (in )
4
5
6
7
8
9
3/MAX604
2
65 130 (cm )
SUPPLY VOLTAGE (V)
COPPER GROUND PAD AREA
MAX604
700
600
500
MAXIMUM CONTINUOUS CURRENT LIMIT
Figure 4. Typical Maximum Power Dissipation vs. Ground Pad
Size.
HIGH-POWER SOIC
air, θ (or θ ) is the thermal resistance of the package
400
300
200
100
0
JB
JC
chosen, and θ
is the thermal resistance through the
BA
printed circuit board, copper traces and other materials
to the surrounding air. The 8-pin SOIC package for the
MAX603/MAX604 features a special lead frame with a
lower thermal resistance and higher allowable power
dissipation. The thermal resistance of this package is
PLASTIC DIP
OPERATING
REGION AT
T = +25°C
J
A
CERAMIC DIP
T = +125°C
θ
= 42°C/W, compared with θ = 110°C/W for an 8-
JB
JB
2
3
4
5
6
7
8
9
10 11 12 13
pin plastic DIP package and θ = 125°C/W for an 8-pin
ceramic DIP package.
JB
SUPPLY VOLTAGE (V)
The GND pins of the MAX603/MAX604 SOIC package
perform the dual function of providing an electrical con-
nection to ground and channeling heat away. Connect
all GND pins to ground using a large pad or ground
plane. Where this is impossible, place a copper plane
on a n a d ja c e nt la ye r. The p a d s hould e xc e e d the
dimensions in Figure 4.
Figure 5. Power Operating Regions: Maximum Output Current
vs. Differential Supply Voltage
low, as shown in Figure 5. Maximum power dissipation
depends on packaging, board layout, temperature, and
air flow. The maximum output current is:
Figure 4 assumes the IC is an 8-pin SOIC package, is
soldered directly to the pad, has a +125°C maximum
junction temperature and a +25°C ambient air tempera-
ture, and has no other heat sources. Use larger pad
sizes for other packages, lower junction temperatures,
higher ambient temperatures, or conditions where the IC
is not soldered directly to the heat-sinking ground pad.
P
× T - T
J A
(
)
MAX
I
=
OUT max
(
)
V
- V
× 100°C
(
)
IN
OUT
where P
is derived from Figure 4.
MAX
Re ve rs e -Cu rre n t P ro t e c t io n
The MAX603/MAX604 has a unique protection scheme
that limits reverse currents when the input voltage falls
below the output. It monitors the voltages on IN and
OUT and switches the IC’s substrate and power bus to
The MAX603/MAX604 c a n re g ula te c urre nts up to
500mA and operate with input voltages up to 11.5V, but
not simultaneously. High output currents can only be
sustained when input-output differential voltages are
8
_______________________________________________________________________________________
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
3/MAX604
__________Ap p lic a t io n s In fo rm a t io n
Fig ure 6 illus tra te s the typ ic a l a p p lic a tion for the
MAX603/MAX604.
OUT
IN
OUTPUT
VOLTAGE
Ca p a c it o r S e le c t io n a n d
Re g u la t o r S t a b ilit y
MAX603
MAX604
OFF
C
IN
C
OUT
10µF
BATTERY
Normally, use 0.1µF to 10µF capacitors on the input
and 10µF on the output of the MAX603/MAX604. The
larger input capacitor values provide better supply-
noise rejection and line-transient response. Improve
load-transient response, stability, and power-supply
rejection by using large output capacitors. For stable
operation over the full temperature range and with load
currents up to 500mA, 10µF is recommended. Using
capacitors smaller than 3.3µF can result in oscillation.
GND
SET
Figure 6. 3.3V or 5V Linear-Regulator Application
No is e
The MAX603/MAX604 exhibit 3mVp-p to 4mVp-p of
noise during normal operation. This is negligible in most
applications. When using the MAX603/MAX604 in appli-
c a tions tha t inc lud e a na log -to-d ig ita l c onve rte rs of
greater than 12 bits, consider the ADC’s power-supply
rejection specifications. Refer to the output noise plot in
the Typical Operating Characteristics.
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
90
80
I
= 1mA
OUT
70
60
50
40
30
20
10
P S RR a n d Op e ra t io n fro m S o u rc e s
Ot h e r t h a n Ba t t e rie s
The MAX603/MAX604 a re d e s ig ne d to d e live r low
dropout voltages and low quiescent currents in battery-
powered systems. Achieving these objectives requires
tra d ing off p owe r-s up p ly nois e re je c tion a nd s wift
re s p ons e to s up p ly va ria tions a nd loa d tra ns ie nts .
Power-supply rejection is 80dB at low freqencies and
rolls off above 10Hz. As the frequency increases above
10kHz, the output capacitor is the major contributor to
the rejection of power-supply noise (Figure 7). Do not
use power supplies with ripple above 100kHz, especial-
ly when the ripple exceeds 100mVp-p. When operating
from sources other than batteries, improved supply-
noise rejection and transient response can be achieved
by increasing the values of the input and output capaci-
tors , a nd throug h p a s s ive filte ring te c hniq ue s . The
Typical Operating Characteristics show the MAX603/
MAX604 supply and load-transient responses.
I = 100mA
OUT
V
IN
= 1V
p-p
FOR f < 400kHz
= 0µF
C
IN
C
OUT
= 10µF
0
0
1
2
3
4
5
6
10
10
10
10
10
10
10
FREQUENCY (Hz)
Figure 7. Power-Supply Rejection Ratio vs. Ripple Frequency
the more positive of the two. The control circuitry can
then remain functioning and turn the pass transistor off,
limiting reverse currents back through the device. This
feature allows a backup regulator or battery pack to
maintain VOUT when the supply at IN fails.
Tra n s ie n t Co n s id e ra t io n s
The Typ ic a l Op e ra ting Cha ra c te ris tic s s how the
MAX603/MAX604 load-transient response. Two compo-
nents of the output response can be observed on the
load-transient graphs—a DC shift from the output imped-
ance due to the different load currents, and the transient
response. Typical transients for step changes in the load
current from 5mA to 500mA are 0.2V. Increasing the out-
put capacitor’s value attenuates transient spikes.
Reverse-current protection activates when the voltage
on IN falls 6mV (20mV maximum) below the voltage on
OUT. Before this happens, currents as high as several
milliamperes can flow back through the device. After
s witc hove r, typ ic a l re ve rs e c urre nts a re limite d to
0.01µA for as long as the condition exists.
_______________________________________________________________________________________
9
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
In p u t -Ou t p u t (Dro p o u t ) Vo lt a g e
___________________Ch ip To p o g ra p h y
A regulator’s minimum input-output voltage differential,
or dropout voltage, determines the lowest usable supply
voltage. In battery-powered systems, this will determine
the us e ful e nd -of-life b a tte ry volta g e . Be c a us e the
MAX603/MAX604 use a P-channel MOSFET pass tran-
sistor, their dropout voltage is a function of rDS(ON) multi-
plied by the load current (see Electrical Characteristics).
IN
OUT
Quickly stepping up the input voltage from the dropout
voltage can result in overshoot. This occurs when the
pass transistor is fully on at dropout and the IC is not
given time to respond to the supply voltage change.
Prevent this by slowing the input voltage rise time.
0. 100"
(2. 54mm)
3/MAX604
OFF GND
SET
0. 104"
(2. 64mm)
TRANSISTOR COUNT: 111
NO DIRECT SUBSTRATE CONNECTION. THE N-SUBSTRATE
IS INTERNALLY SWITCHED BETWEEN THE MORE POSITIVE
OF IN OR OUT.
10 ______________________________________________________________________________________
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
3/MAX604
________________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
E
MIN
MAX
0.200
–
MIN
–
MAX
5.08
–
A
–
E1
D
A1 0.015
A2 0.125
A3 0.055
0.38
3.18
1.40
0.41
1.14
0.20
0.13
7.62
6.10
2.54
7.62
–
0.175
0.080
0.022
0.065
0.012
0.080
0.325
0.310
–
4.45
2.03
0.56
1.65
0.30
2.03
8.26
7.87
–
A3
A2
A1
A
L
B
0.016
B1 0.045
0.008
D1 0.005
0.300
E1 0.240
0.100
eA 0.300
C
0° - 15°
E
C
e
e
B1
eA
eB
–
–
B
eB
L
–
0.400
0.150
10.16
3.81
0.115
2.92
D1
INCHES
MILLIMETERS
DIM
PINS
P PACKAGE
PLASTIC
DUAL-IN-LINE
MIN
MAX MIN
MAX
8
D
D
D
D
D
D
0.348 0.390 8.84
9.91
14
16
18
20
24
0.735 0.765 18.67 19.43
0.745 0.765 18.92 19.43
0.885 0.915 22.48 23.24
1.015 1.045 25.78 26.54
1.14 1.265 28.96 32.13
INCHES
MILLIMETERS
DIM
MIN
0.053
MAX
0.069
0.010
0.019
0.010
0.157
MIN
1.35
0.10
0.35
0.19
3.80
MAX
1.75
0.25
0.49
0.25
4.00
A
D
A1 0.004
B
C
E
e
0.014
0.007
0.150
0°-8°
A
0.101mm
0.005in.
0.050
1.27
e
H
L
0.228
0.016
0.244
0.050
5.80
0.40
6.20
1.27
A1
C
B
L
INCHES
MILLIMETERS
DIM PINS
S PACKAGE
SMALL
OUTLINE
MIN MAX
MIN
MAX
5.00
8.75
8
0.189 0.197 4.80
D
D
D
E
H
14 0.337 0.344 8.55
16 0.386 0.394 9.80 10.00
21-0041A
______________________________________________________________________________________ 11
5 V/3 .3 V o r Ad ju s t a b le , Lo w -Dro p o u t ,
Lo w IQ, 5 0 0 m A Lin e a r Re g u la t o rs
___________________________________________P a c k a g e In fo rm a t io n (c o n t in u e d )
INCHES
MIN
MILLIMETERS
DIM
MAX
0.200
0.023
0.065
0.015
0.310
0.320
MIN
–
MAX
5.08
0.58
1.65
0.38
7.87
8.13
E1
E
A
B
–
0.014
0.36
0.97
0.20
5.59
7.37
D
B1 0.038
A
C
E
0.008
0.220
E1 0.290
e
L
0.100
2.54
0.125
0.150
0.015
–
0.200
–
3.18
3.81
0.38
–
5.08
–
0°-15°
C
Q
L1
Q
S
L
L1
0.070
0.098
–
1.78
2.49
–
e
B1
S1 0.005
0.13
B
3/MAX604
S1
S
INCHES
MILLIMETERS
DIM PINS
MIN
–
MAX MIN MAX
J PACKAGE
(0.300 in.)
CERDIP
DUAL-IN-LINE
D
D
D
D
D
D
8
0.405
0.785
0.840
0.960
1.060
1.280
–
–
–
–
–
–
10.29
19.94
21.34
24.38
26.92
32.51
14
16
18
20
24
–
–
–
–
–
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1994 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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