MAX1598 [MAXIM]
Low-Noise, Low-Dropout, 200mA Linear Regulator; 低噪声，低压差， 200mA线性稳压器
| 型号： | MAX1598 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Noise, Low-Dropout, 200mA Linear Regulator |
| 文件： | 总9页 (文件大小：364K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2584; Rev 0; 10/02
Low-Noise, Low-Dropout, 200mA
Linear Regulator
General Description
Features
The MAX1598 low-noise, low-dropout linear regulator
operates from a 2.5V to 6.5V input and delivers up to
ꢀ 200mA Output Current
ꢀ Low Output Noise: 30µV
RMS
200mA. Typical output noise is 30µV
, and typical
RMS
dropout is only 236mV at 200mA. The output voltage is
preset to voltages from 2.5V to 5V in 100mV increments.
ꢀ Low 55mV Dropout at 50mA Output
ꢀ Low 85µA No-Load Supply Current
Designed with an internal P-channel MOSFET pass
transistor, the MAX1598 maintains a low 100µA supply
current independent of the load current and dropout
voltage. Other features include a 10nA logic-controlled
shutdown mode, short-circuit and thermal-shutdown
protection, and reverse battery protection. The device
also includes an autodischarge function, which actively
discharges the output voltage to ground when the
device is placed in shutdown. The MAX1598 comes in
a thin 5-pin SOT23 package.
ꢀ Low 100µA Operating Supply Current,
Even in Dropout
ꢀ Thermal-Overload and Short-Circuit Protection
ꢀ Reverse Battery Protection
ꢀ Output Current Limit
ꢀ Preset Output Voltages
ꢀ 10nA Logic-Controlled Shutdown
Applications
Cellular, Cordless, and PCS Phones
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PCMCIA Cards
MAX1598EZKxy-T*
-40°C to +85°C Thin SOT23-5
Modems
*xy is the output voltage code (see the Selector Guide at end of
data sheet).
Hand-Held Instruments
Palmtop Computers
Electronic Planners
Pin Configuration
Typical Operating Circuit
TOP VIEW
INPUT
OUTPUT
2.5V TO 6.5V
PRESET
IN
OUT
1
2
3
5
4
OUT
BP
IN
GND
2.5V TO 5V
200mA
C
C
OUT
2.2µF
IN
1µF
MAX1598
MAX1598
ON
SHDN
BP
OFF
SHDN
GND
C
BP
0.01µF
THIN SOT23-5
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Noise, Low-Dropout, 200mA
Linear Regulator
ABSOLUTE MAXIMUM RATINGS
IN to GND....................................................................-7V to +7V
Output Short-Circuit Duration ............................................Infinite
SHDN to GND..............................................................-7V to +7V
SHDN to IN...............................................................-7V to +0.3V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
(thin).........................................................................110°C/W
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
θ
JB
OUT, BP to GND..........................................-0.3V to (V + 0.3V)
IN
Continuous Power Dissipation (T = +70°C)
A
5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C)....727mW
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 = (V
+ 0.5V) or 2.5V (whichever is greater), T = -40°C to +85°C, unless otherwise noted. Typical values are at T =
IN
OUT(NOMINAL)
A
A
+25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
2.5
TYP
MAX
6.5
UNITS
Input Voltage
V
V
IN
I
= 0.1mA, T = +25°C, V ≥ 2.5V
OUT
-1.4
+1.4
OUT
A
Output Voltage Accuracy
%
I
V
= 0.1mA to 120mA, T = -40°C to +85°C,
A
OUT
-3
+2
≥ 2.5V
OUT
Maximum Output Current
Current Limit
200
220
mA
mA
I
458
85
LIM
No load
180
120
Ground-Pin Current
I
Q
µA
I
I
I
I
= 150mA
= 1mA
100
1.1
55
OUT
OUT
OUT
OUT
Dropout Voltage (Note 2)
mV
= 50mA
= 200mA
236
V
= 2.5V or (V
= 1mA
+ 0.1V) to 6.5V,
IN
OUT
Line Regulation
∆V
∆V
-0.15
0
+0.15
0.04
%/V
LNR
LDR
I
OUT
Load Regulation
Output Voltage Noise
SHUTDOWN
I
= 0.1mA to 120mA, C
= 1µF
0.01
30
%/mA
OUT
OUT
C
C
= 10µF
OUT
OUT
f = 10Hz to 100kHz,
= 0.01µF
e
µV
RMS
n
C
BP
= 100µF
20
V
V
V
= 2.5V to 5.5V
= 2.5V to 5.5V
2.0
IH
IN
IN
SHDN Input Threshold
V
V
0.4
1
IL
T
T
T
T
= +25°C
0.01
0.5
A
A
A
A
SHDN Input Bias Current
I
V
V
= V
µA
µA
SHDN
SHDN
IN
= +85°C
= +25°C
= +85°C
0.01
0.2
1
Shutdown Supply Current
I
= 0V
OUT
Q(SHDN)
C
C
= 0.1µF
BP
T
T
= +25°C
30
150
300
A
A
Shutdown Exit Delay
= 1µF, no load
µs
OUT
= -40°C to +85°C
(Note 3)
Resistance Shutdown Discharge
300
Ω
2
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 200mA
Linear Regulator
ELECTRICAL CHARACTERISTICS (continued)
(V = (V
+ 0.5V) or 2.5V (whichever is greater), T = -40°C to +85°C, unless otherwise noted. Typical values are at T =
IN
OUT(NOMINAL)
A
A
+25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
155
15
°C
°C
SHDN
∆T
SHDN
Note 1: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed through
A
correlation using guaranteed by design (GBD) methods.
Note 2: The dropout voltage is defined as V - V
, when V
is 100mV below the value of V
for V = V
+ 0.5V.
IN
OUT
OUT
OUT
IN
OUT
Note 3: Time needed for V
to reach 95% of final value.
OUT
__________________________________________Typical Operating Characteristics
(V = (V
+ 0.5V) or 2.5V (whichever is greater), C = 1µF, C
= 2.2µF, C = 0.01µF, T = +25°C, unless other-
OUT BP A
IN
OUT(NOMINAL)
IN
wise noted.)
OUTPUT VOLTAGE vs. LOAD CURRENT
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK50)
GROUND-PIN CURRENT
vs. LOAD CURRENT
(MAX1598EZK25)
2.60
2.55
2.50
2.45
2.40
5.2
5.1
5.0
4.9
4.8
110
105
100
95
MAX1598EZK50
MAX1598EZK25
90
85
80
75
70
65
60
0
50
100
150
200
0
50
100
150
200
0
50
100
150
200
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
GROUND-PIN CURRENT vs. INPUT VOLTAGE
(MAX1598EZK50)
GROUND-PIN CURRENT vs. INPUT VOLTAGE
(MAX1598EZK25)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
120
100
80
60
40
20
0
6
5
4
3
2
1
0
120
100
80
60
40
20
0
I
= 50mA
LOAD
NO LOAD
I
= 50mA
LOAD
MAX1598EZK50
NO LOAD
NO LOAD
MAX1598EZK25
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
Low-Noise, Low-Dropout, 200mA
Linear Regulator
Typical Operating Characteristics (continued)
(V = (V
IN
+ 0.5V) or 2.5V (whichever is greater), C = 1µF, C
= 2.2µF, C = 0.01µF, T = +25°C, unless other-
OUT(NOMINAL)
IN
OUT
BP
A
wise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
GROUND-PIN CURRENT
vs. TEMPERATURE
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX1598EZK50)
(MAX1598EZK25)
2.60
2.55
2.50
2.45
2.40
5.2
5.1
5.0
4.9
4.8
200
180
160
140
120
100
80
I
= 50mA
I
= 50mA
LOAD
I
= 50mA
LOAD
LOAD
MAX1598EZK50
MAX1598EZK25
60
40
20
0
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK25)
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK50)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
60
50
40
30
20
10
0
300
300
250
200
150
250
200
T
= +25°C
A
C
= 10µF
OUT
T
= +25°C
A
T
= +85°C
A
150
100
T
= +85°C
A
C
= 1µF
OUT
100
100
50
T
= -40°C
A
T
= -40°C
A
50
0
I
= 50mA
LOAD
C
BP
= 0.1µF
0
0
40
60
120
160
200
0
40
80
120
160
200
0.01
0.1
1
10
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
OUTPUT NOISE vs. LOAD CURRENT
OUTPUT NOISE vs. BP CAPACITANCE
10
80
70
60
50
40
30
20
10
0
60
50
40
30
20
10
0
C
I
= 10µF
= 10mA
C
I
= 0.01µF
LOAD
OUT
LOAD
BP
= 10mA
MAX1598EZK50
f = 10Hz to 100kHz
1
MAX1598EZK30
MAX1598EZK25
MAX1598EZK50
MAX1598EZK30
C
= 1µF
OUT
0.1
C
C
= 10µF
MAX1598EZK25
OUT
C
= 10µF
OUT
= 0.01µF
BP
f = 10Hz to 100kHz
0.01
0
1
10
FREQUENCY (kHz)
100
1000
1
10
100
1000
0.001
0.01
BP CAPACITANCE (µF)
0.1
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 200mA
Linear Regulator
Typical Operating Characteristics (continued)
(V = (V
IN
+ 0.5V) or 2.5V (whichever is greater), C = 1µF, C
IN
= 2.2µF, C = 0.01µF, T = +25°C, unless other-
OUT(NOMINAL)
OUT
BP
A
wise noted.)
REGION OF STABLE C
ESR
OUT
OUTPUT NOISE 10Hz TO 100kHz
vs. LOAD CURRENT
100
10
1
C
= 10µF
OUT
V
OUT
C
= 2.2µF
OUT
50µV/div
STABLE REGION
0.1
0.01
0
50
100
150
200
1ms/div
= 10µF, I
LOAD CURRENT (mA)
MAX1598EZK25, C
= 10mA, C = 0.1µF
BP
OUT
LOAD
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1598-20
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
MAX1598-19
MAX1598-18
3.01V
4V
3V
3.01V
3.00V
2.99V
V
V
V
OUT
IN
3.00V
2.99V
V
OUT
3.001V
3.000V
2.999V
OUT
50mA
50mA
I
LOAD
I
LOAD
100µs/div
= 50mA
10µs/div
MAX1598EZK30, V = V + 0.5V,
10µs/div
MAX1598EZK30, V = V + 0.1V,
MAX1598EZK30, I
LOAD
IN
OUT
IN
OUT
C
= 10µF, I
= 0 TO 50mA
C
= 10µF, I
= 0 TO 50mA
IN
LOAD
IN
LOAD
MAX1598EZK25
SHUTDOWN EXIT DELAY
MAX1598EZK50
SHUTDOWN EXIT DELAY
ENTERING SHUTDOWN
MAX1598-23
MAX1598-21
MAX1598-22
V
V
V
V
SHDN
SHDN
SHDN
OUT
2V
0V
2V
2V
0V
C
= 0.01µF
BP
C
= 0.01µF
BP
0V
5V
V
4V
2V
1V
0V
OUT
C
= 0.1µF
BP
V
OUT
C
= 0.1µF
BP
2V
0V
0V
5µs/div
= 50mA
5µs/div
= 50mA
LOAD
500µs/div
NO LOAD
I
I
LOAD
_______________________________________________________________________________________
5
Low-Noise, Low-Dropout, 200mA
Linear Regulator
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to GND
(see the Capacitor Selection and Regulator Stability section).
1
IN
Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground
plane to maximize power dissipation.
2
3
GND
Active-Low Shutdown Input. A logic low reduces the supply current to 10nA and causes the output
voltage to discharge to GND. Connect to IN for normal operation.
SHDN
Reference-Noise Bypass. Bypass with a low-leakage, 0.01µF ceramic capacitor for reduced noise at
the output.
4
5
BP
OUT
Regulator Output. Sources up to 200mA. Bypass with a 2.2µF (<0.2Ω typical ESR) capacitor to GND.
lower, which allows more current to pass to the output
Detailed Description
and increases the output voltage. If the feedback volt-
age is too high, the pass-transistor gate is pulled up,
allowing less current to pass to the output. The output
voltage is fed back through an internal resistor voltage-
divider connected to the OUT pin.
The MAX1598 is a low-noise, low-dropout, low-quies-
cent-current linear regulator designed primarily for bat-
tery-powered applications. The part is available with
preset output voltages from 2.5V to 5V in 100mV incre-
ments. This device can supply loads up to 200mA. As
illustrated in Figure 1, the MAX1598 consists of a 1.25V
reference, error amplifier, P-channel pass transistor,
and internal feedback voltage-divider.
An external bypass capacitor connected to the BP pin
reduces noise at the output. Additional blocks include a
current limiter, reverse battery protection, thermal sen-
sor, and shutdown logic. The MAX1598 also includes
an autodischarge function, which actively discharges
the output voltage to ground when the device is placed
in shutdown mode.
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
REVERSE
BATTERY
PROTECTION
IN
SHDN
P
MOS DRIVER
WITH I
LIMIT
ERROR
AMP
SHUTDOWN
AND
POWER-ON
CONTROL
MAX1598
OUT
N
1.25V
REF
THERMAL
SENSOR
GND
BP
Figure 1. Functional Diagram
_______________________________________________________________________________________
6
Low-Noise, Low-Dropout, 200mA
Linear Regulator
where T - T is the temperature difference between the
Output Voltage
The MAX1598 is supplied with factory-set output voltages
from 2.5V to 5V in 100mV increments. Except for the
MAX1598EZK29 and the MAX1598EZK32 (which have an
output voltage preset at 2.84V and 3.15V, respectively),
the two-digit suffix allows the customer to choose the out-
put voltage in 100mV increments. For example, the
MAX1598EZK33 has a preset output voltage of 3.3V (see
the Selector Guide).
J
A
MAX1598 die junction and the surrounding air, θ (or
JB
θ
JC
) is the thermal resistance of the package, and θ
is the thermal resistance through the PC board, copper
traces, and other materials to the surrounding air.
BA
The GND pin of the MAX1598 performs the dual func-
tions of providing an electrical connection to ground
and channeling heat away. Connect the GND pin to
ground using a large pad or ground plane.
Internal P-Channel Pass Transistor
The MAX1598 features a 1.1Ω typical P-channel MOSFET
pass transistor. This provides several advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires no
base drive, which reduces quiescent current consider-
ably. PNP-based regulators waste considerable current in
dropout when the pass transistor saturates. They also use
high base-drive currents under large loads. The
MAX1598 does not suffer these problems and consumes
only 100µA of quiescent current whether in dropout, light-
load, or heavy-load applications (see the Typical
Operating Characteristics).
Reverse Battery Protection
The MAX1598 has a unique protection scheme that limits
the reverse supply current to 1mA when either V or
IN
V
falls below ground. Their circuitry monitors the
SHDN
polarity of these two pins and disconnects the internal
circuitry and parasitic diodes when the battery is
reversed. This feature prevents device damage.
Noise Reduction
An external 0.01µF bypass capacitor at BP, in conjunc-
tion with an internal 200kΩ resistor, creates an 80Hz
lowpass filter for noise reduction. The MAX1598 exhibits
30µV
OUT
of output voltage noise with C = 0.01µF and
BP
= 10µF. This is negligible in most applications.
RMS
C
Current Limit
The MAX1598 includes a current limiter, which monitors
and controls the pass transistor’s gate voltage, limiting the
output current to 458mA. For design purposes, consider
the current limit to be 220mA minimum to 1.1A maximum.
The output can be shorted to ground indefinitely without
damaging the part.
Startup time is minimized by a power-on circuit that pre-
charges the bypass capacitor. The Typical Operating
Characteristics section shows graphs of Noise vs. BP
Capacitance, Noise vs. Load Current, and Output Noise
Spectral Density.
____________Applications Information
Capacitor Selection and
Regulator Stability
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX1598. When the junction temperature
Under normal conditions, use a 1µF capacitor on the
MAX1598 input and a 2.2µF to 10µF capacitor on the out-
put. Larger input capacitor values and lower ESRs pro-
vide better supply-noise rejection and line-transient
response. Reduce noise and 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 200mA, a
2.2µF (min) ceramic capacitor is recommended.
exceeds T = +155°C, the thermal sensor signals the
J
shutdown logic, turning off the pass transistor and
allowing the IC to cool. The thermal sensor turns the
pass transistor on again after the IC’s junction tempera-
ture cools by 15°C, resulting in a pulsed output during
continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX1598 in the event of fault conditions. For continual
operation, do not exceed the absolute maximum junc-
Note that some ceramic dielectrics exhibit large capaci-
tance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary to
increase the capacitance by a factor of 2 or more to
ensure stability at temperatures below -10°C. With X7R or
X5R dielectrics, 2.2µF should be sufficient at all operating
tion-temperature rating of T = +150°C.
J
Operating Region and Power Dissipation
The MAX1598 maximum power dissipation depends on
the thermal resistance of the case and circuit board, the
temperature difference between the die junction and
ambient air, and the rate of air flow. The power dissipation
temperatures. A graph of the Region of Stable C
ESR
OUT
vs. Load Current is shown in the Typical Operating
across the device is P = I
power dissipation is:
(V - V
). The maximum
OUT
OUT IN
Characteristics.
P
MAX
= (T - T ) / (θ + θ )
BA
J
A
JB
_______________________________________________________________________________________
7
Low-Noise, Low-Dropout, 200mA
Linear Regulator
Use a 0.01µF bypass capacitor at BP for low output volt-
age noise. Increasing the capacitance slightly decreases
output noise but increases startup time. Values above
0.1µF provide no performance advantage and are not rec-
ommended (see the Shutdown Exit Delay graphs in the
Typical Operating Characteristics).
Load-Transient Considerations
The MAX1598 load-transient response graphs (see the
Typical Operating Characteristics) show two compo-
nents of the output response: a DC shift from the output
impedance due to the load current change, and the
transient response. Typical transient for a step change
in the load current from 0 to 50mA is 12mV. Increasing
the output capacitor’s value and decreasing the ESR
attenuates the overshoot.
PSRR and Operation from Sources
Other than Batteries
The MAX1598 are designed to deliver low dropout volt-
ages and low quiescent currents in battery-powered
systems. Power-supply rejection is 63dB at low fre-
quencies and rolls off above 10kHz. See the Power-
Supply Rejection Ratio Frequency graph in the Typical
Operating Characteristics.
Input-Output (Dropout) Voltage
The regulator’s minimum input-output voltage differen-
tial (or dropout voltage) determines the lowest usable
supply voltage. In battery-powered systems, this deter-
mines the useful end-of-life battery voltage. Because
the MAX1598 uses a P-channel MOSFET pass transis-
tor, their dropout voltage is a function of drain-to-source
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 bypass capacitors, and through passive fil-
tering techniques. The Typical Operating Charac-
teristics show the MAX1598’s line- and load-transient
responses.
on-resistance (R
) multiplied by the load current
DS(ON)
(see the Typical Operating Characteristics).
___________________Chip Information
TRANSISTOR COUNT: 247
SUBSTRATE CONNECTED TO GND
_
Selector Guide
OUTPUT VOLTAGE
(xy) CODE
SOT TOP
MARK
PRESET OUTPUT
VOLTAGE (V)
MAX1598
THIN
THIN SOT23
MAX1598EZK25-T
MAX1598EZK28-T
MAX1598EZK29-T
MAX1598EZK30-T
MAX1598EZK32-T
MAX1598EZK33-T
MAX1598EZK36-T
MAX1598EZK50-T
Other xy**
2.50
2.80
2.84
3.00
3.15
3.30
3.60
5.00
x.y0
ADRM
ADRJ
ADRN
ADRO
ADRP
ADRQ
ADRR
ADRS
—
**Other xy between 2.5V and 5V are available in 100mV increments.
Contact factory for other versions. Minimum order quantity is 25,000
units.
8
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 200mA
Linear Regulator
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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.
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