19-2584; Rev 0; 10/02
Low-Noise, Low-Dropout, 200mA
Linear Regulator
General Description
The MAX1598 low-noise, low-dropout linear regulator
operates from a 2.5V to 6.5V input and delivers up to
200mA. Typical output noise is 30µV
RMS
, and typical
dropout is only 236mV at 200mA. The output voltage is
preset to voltages from 2.5V to 5V in 100mV increments.
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.
o
200mA Output Current
o
Low Output Noise: 30µV
RMS
o
Low 55mV Dropout at 50mA Output
o
Low 85µA No-Load Supply Current
o
Low 100µA Operating Supply Current,
Even in Dropout
o
Thermal-Overload and Short-Circuit Protection
o
Reverse Battery Protection
o
Output Current Limit
o
Preset Output Voltages
o
10nA Logic-Controlled Shutdown
Features
MAX1598
Applications
Cellular, Cordless, and PCS Phones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
PART
MAX1598EZKxy-T*
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
Thin SOT23-5
*xy
is the output voltage code (see the Selector Guide at end of
data sheet).
Typical Operating Circuit
TOP VIEW
INPUT
2.5V TO 6.5V
IN
C
IN
1µF
ON
OFF
C
BP
0.01µF
OUT
C
OUT
2.2µF
OUTPUT
PRESET
2.5V TO 5V
200mA
Pin Configuration
IN 1
5
OUT
MAX1598
SHDN
BP
GND
GND 2
MAX1598
SHDN 3
4
BP
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
MAX1598
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
OUT, BP to GND ..........................................-0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
θ
JB
(thin).........................................................................110°C/W
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
= (V
OUT(NOMINAL)
+ 0.5V) or 2.5V (whichever is greater), T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER
Input Voltage
Output Voltage Accuracy
Maximum Output Current
Current Limit
Ground-Pin Current
I
LIM
I
Q
No load
I
OUT
= 150mA
I
OUT
= 1mA
Dropout Voltage (Note 2)
I
OUT
= 50mA
I
OUT
= 200mA
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN
Input Threshold
SHDN
Input Bias Current
Shutdown Supply Current
V
IH
V
IL
I
SHDN
I
Q(SHDN)
V
IN
= 2.5V to 5.5V
V
IN
= 2.5V to 5.5V
V
SHDN
= V
IN
V
OUT
= 0V
C
BP
= 0.1µF
C
OUT
= 1µF, no load
(Note 3)
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
300
0.01
0.5
0.01
0.2
30
150
µs
300
Ω
1
2.0
0.4
1
V
µA
µA
∆V
LNR
∆V
LDR
e
n
V
IN
= 2.5V or (V
OUT
+ 0.1V) to 6.5V,
I
OUT
= 1mA
I
OUT
= 0.1mA to 120mA, C
OUT
= 1µF
f = 10Hz to 100kHz,
C
BP
= 0.01µF
C
OUT
= 10µF
C
OUT
= 100µF
-0.15
SYMBOL
V
IN
I
OUT
= 0.1mA, T
A
= +25°C, V
OUT
≥
2.5V
I
OUT
= 0.1mA to 120mA, T
A
= -40°C to +85°C,
V
OUT
≥
2.5V
CONDITIONS
MIN
2.5
-1.4
-3
200
220
458
85
100
1.1
55
236
0
0.01
30
20
+0.15
0.04
%/V
%/mA
µV
RMS
120
mV
180
TYP
MAX
6.5
+1.4
+2
%
mA
mA
µA
UNITS
V
Shutdown Exit Delay
Resistance Shutdown Discharge
2
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 200mA
Linear Regulator
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= (V
OUT(NOMINAL)
+ 0.5V) or 2.5V (whichever is greater), T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
SHDN
∆T
SHDN
155
15
°C
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1598
Note 1:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed through
correlation using guaranteed by design (GBD) methods.
Note 2:
The dropout voltage is defined as V
IN
- V
OUT
, when V
OUT
is 100mV below the value of V
OUT
for V
IN
= V
OUT
+ 0.5V.
Note 3:
Time needed for V
OUT
to reach 95% of final value.
__________________________________________Typical Operating Characteristics
(V
IN
= (V
OUT(NOMINAL)
+ 0.5V) or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 2.2µF, C
BP
= 0.01µF, T
A
= +25°C, unless other-
wise noted.)
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK25)
MAX1598-01
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK50)
MAX1598-02
GROUND-PIN CURRENT
vs. LOAD CURRENT
105
GROUND-PIN CURRENT (µA)
100
95
90
85
80
75
70
65
MAX1598EZK25
MAX1598EZK50
MAX1598-03
2.60
5.2
110
OUTPUT VOLTAGE (V)
2.50
OUTPUT VOLTAGE (V)
2.55
5.1
5.0
2.45
4.9
2.40
0
50
100
150
200
LOAD CURRENT (mA)
4.8
0
50
100
150
200
LOAD CURRENT (mA)
60
0
50
100
150
200
LOAD CURRENT (mA)
GROUND-PIN CURRENT vs. INPUT VOLTAGE
(MAX1598EZK25)
MAX1598-04
GROUND-PIN CURRENT vs. INPUT VOLTAGE
(MAX1598EZK50)
MAX1598-05
OUTPUT VOLTAGE vs. INPUT VOLTAGE
NO LOAD
5
OUTPUT VOLTAGE (V)
MAX1598EZK50
4
3
2
1
0
MAX1598EZK25
MAX1598-06
120
I
LOAD
= 50mA
GROUND-PIN CURRENT (µA)
100
80
NO LOAD
60
40
20
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
120
100
80
I
LOAD
= 50mA
6
GROUND-PIN CURRENT (µA)
NO LOAD
60
40
20
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
Low-Noise, Low-Dropout, 200mA
Linear Regulator
MAX1598
Typical Operating Characteristics (continued)
(V
IN
= (V
OUT(NOMINAL)
+ 0.5V) or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 2.2µF, C
BP
= 0.01µF, T
A
= +25°C, unless other-
wise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX1598EZK25)
MAX1598-07
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX1598EZK50)
MAX1598-08
GROUND-PIN CURRENT
vs. TEMPERATURE
180
GROUND-PIN CURRENT (µA)
160
140
120
100
80
60
40
20
MAX1598EZK25
MAX1598EZK50
I
LOAD
= 50mA
MAX1598-09
MAX1598-15
MAX1598-12
2.60
I
LOAD
= 50mA
2.55
5.2
I
LOAD
= 50mA
5.1
200
OUTPUT VOLTAGE (V)
2.50
OUTPUT VOLTAGE (V)
5.0
2.45
4.9
2.40
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
4.8
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK25)
MAX1598-10
DROPOUT VOLTAGE vs. LOAD CURRENT
(MAX1598EZK50)
MAX1598-11
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
60
50
PSRR (dB)
300
250
DROPOUT VOLTAGE (mV)
200
T
A
= +85°C
150
100
T
A
= -40°C
50
0
0
40
60
120
160
T
A
= +25°C
300
250
DROPOUT VOLTAGE (mV)
200
150
100
50
0
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
C
OUT
= 10µF
40
30
20
10
0
I
LOAD
= 50mA
C
BP
= 0.1µF
0.01
0.1
1
10
100
1000
C
OUT
= 1µF
200
0
40
80
120
160
200
LOAD CURRENT (mA)
LOAD CURRENT (mA)
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX1598-13
OUTPUT NOISE vs. BP CAPACITANCE
70
OUTPUT NOISE (µV
RMS
)
60
50
MAX1598EZK50
40
30
20
MAX1598EZK25
10
0
10
0
0.001
0.01
BP CAPACITANCE (µF)
0.1
1
MAX1598EZK30
C
OUT
= 10µF
I
LOAD
= 10mA
f = 10Hz to 100kHz
MAX1598-14
OUTPUT NOISE vs. LOAD CURRENT
60
50
OUTPUT NOISE (µV
RMS
)
40
MAX1598EZK30
30
20
C
OUT
= 10µF
C
BP
= 0.01µF
f = 10Hz to 100kHz
10
100
1000
MAX1598EZK25
MAX1598EZK50
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
C
BP
= 0.01µF
I
LOAD
= 10mA
80
1
C
OUT
= 1µF
0.1
C
OUT
= 10µF
0.01
0
1
10
FREQUENCY (kHz)
100
1000
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
Low-Noise, Low-Dropout, 200mA
Linear Regulator
Typical Operating Characteristics (continued)
(V
IN
= (V
OUT(NOMINAL)
+ 0.5V) or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 2.2µF, C
BP
= 0.01µF, T
A
= +25°C, unless other-
wise noted.)
OUTPUT NOISE 10Hz TO 100kHz
MAX1598-16
MAX1598
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
MAX1598-17
100
10
C
OUT
ESR (Ω)
C
OUT
= 10µF
V
OUT
50µV/div
1
C
OUT
= 2.2µF
STABLE REGION
0.1
0.01
1ms/div
MAX1598EZK25, C
OUT
= 10µF, I
LOAD
= 10mA, C
BP
= 0.1µF
0
50
100
150
200
LOAD CURRENT (mA)
LINE-TRANSIENT RESPONSE
MAX1598-18
LOAD-TRANSIENT RESPONSE
MAX1598-19
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1598-20
4V
3V
3.01V
V
IN
3.00V
2.99V
V
OUT
3.01V
3.00V
2.99V
V
OUT
3.001V
3.000V
2.999V
V
OUT
50mA
I
LOAD
50mA
I
LOAD
100µs/div
MAX1598EZK30, I
LOAD
= 50mA
10µs/div
MAX1598EZK30, V
IN
= V
OUT
+ 0.5V,
C
IN
= 10µF, I
LOAD
= 0 TO 50mA
10µs/div
MAX1598EZK30, V
IN
= V
OUT
+ 0.1V,
C
IN
= 10µF, I
LOAD
= 0 TO 50mA
MAX1598EZK25
SHUTDOWN EXIT DELAY
MAX1598-21
MAX1598EZK50
SHUTDOWN EXIT DELAY
MAX1598-22
ENTERING SHUTDOWN
MAX1598-23
2V
0V
C
BP
= 0.01µF
V
SHDN
2V
0V
C
BP
= 0.01µF
V
SHDN
2V
0V
5V
V
SHDN
2V
C
BP
= 0.1µF
V
OUT
4V
C
BP
= 0.1µF
V
OUT
V
OUT
1V
2V
0V
0V
5µs/div
I
LOAD
= 50mA
500µs/div
NO LOAD
0V
5µs/div
I
LOAD
= 50mA
_______________________________________________________________________________________
5
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