MAX1615EUK ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS(V = 15V, SHDN = V , I = 5μA, T = T to T , unless otherwise noted. Typica ..
MAX1615EUK ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS(V = 15V, SHDN = V , I = 5μA, T = T to T , unless otherwise noted. Typica ..
MAX1615EUK ,High-Voltage, Low-Power Linear Regulators for Notebook Computersfeatures include wide♦ <1μA Shutdown Supply Currentinput voltage range, low dropout voltage, and lo ..
MAX1615EUK ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersELECTRICAL CHARACTERISTICS (continued)(V = 15V, SHDN = V , I = 5μA, T = T to T , unless otherwise n ..
MAX1615EUK+ ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersApplications_______________Ordering InformationCMOS/RTC Backup PowerPIN- SOTPART TEMP RANGEMicrocon ..
MAX1615EUK+T ,High-Voltage, Low-Power Linear Regulators for Notebook ComputersGeneral Description ________
MAX4323ESA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsFeaturesThe MAX4322/MAX4323/MAX4326/MAX4327/MAX4329 SOT23 Packages (MAX4322/MAX4323)family of oper ..
MAX4323ESA+ ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsMAX4322/MAX4323/MAX4326/MAX4327/MAX432919-1380; Rev 3; 10/02Single/Dual/Quad, Low-Cost, UCSP/SOT23, ..
MAX4323EUA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsGeneral Description ________
MAX4326ESA ,Single/Dual/Quad / Low-Cost / SOT23 / Low-Power / Rail-to-Rail I/O Op AmpsMAX4322/MAX4323/MAX4326/MAX4327/MAX432919-1380; Rev 2a; 12/99Single/Dual/Quad, Low-Cost, SOT23,Low- ..
MAX4326ESA+ ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsGeneral Description ________
MAX4326ESA+T ,Single/Dual/Quad, Low-Cost, UCSP/SOT23, Low-Power, Rail-to-Rail I/O Op AmpsApplicationsV3 SHDN CCUCSPRail-to-Rail is a registered trademark of Nippon Motorola, Ltd.Pin Config ..
MAX1615EUK-MAX1615EUK+-MAX1615EUK+T-MAX1616EUK-MAX1616EUK+-MAX1616EUK+T
High-Voltage, Low-Power Linear Regulators for Notebook Computers
________________General DescriptionThe MAX1615/MAX1616 are micropower, SOT23-5 lin-
ear regulators that supply always-on, keep-alive power
to CMOS RAM and microcontrollers (μCs) in systems
with high-voltage batteries. Key features include wide
input voltage range, low dropout voltage, and low qui-
escent supply current.
Despite a miserly 8μA (max) no-load supply current, the
MAX1615/MAX1616 have excellent line-transient
response and AC power-supply rejection ratio. They
provide a clean, fixed 5V or 3.3V output (MAX1615) or
an adjustable 1.24V to 28V output (MAX1616), even
when subjected to fast supply-voltage changes that
occur during the switchover from battery to AC adapter
input power. The space-saving SOT23-5 package has
excellent thermal characteristics and tolerates up to
571mW of power dissipation. Fault protection is provid-
ed by internal foldback current limiting and thermal-
shutdown circuitry. The MAX1615/MAX1616 are now
available in lead-free packages.
________________________ApplicationsCMOS/RTC Backup Power
Microcontroller Power
Notebook Computers
Smart-Battery Packs
PDAs and Handy-Terminals
Battery-Powered Systems
____________________________Feature4V to 28V Input Range8μA (max) Quiescent Supply Current<1μA Shutdown Supply Current3.3V or 5V, Pin-Selectable Output (MAX1615)
Adjustable 1.24V to 28V Output (MAX1616)30mA Output Current ±2% Initial Output AccuracyThermal-Overload Protection5-Pin SOT23 PackageLow Costigh-Voltage, Low-Power Linear Regulators
for Notebook ComputersGND
5/3 (FB)OUT
( ) ARE FOR MAX1616.5SHDNIN
MAX1615
MAX1616
SOT23-5TOP VIEW4
___________________Pin ConfigurationOUT
SHDN
GND5/3
BATTERYCIN
0.1μF
COUT
4.7μF
OUTPUT
VOLTAGE
MAX1615
___________Typical Operating Circuit19-1225; Rev 3; 9/04
PART
MAX1615EUK-T-40°C to +85°C
TEMP RANGEPIN-
PACKAGE5 SOT23-5
_______________Ordering Information
SOT
TOP MARKABZD
MAX1616EUK-TABZE-40°C to +85°C5 SOT23-5
+Denotes lead-free package.
MAX1615EUK+TABZD-40°C to +85°C5 SOT23-5
MAX1616EUK+TABZE-40°C to +85°C5 SOT23-5
igh-Voltage, Low-Power Linear Regulatorsor Notebook ComputersABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 15V, SHDN= VIN, ILOAD= 5μA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
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.
IN to GND.................................................................-0.3V to 30V
Terminal Voltages to GND
SHDNto GND...........................................-0.3V to (VIN+ 0.3V)
5/3to GND ............................................-0.3V to (VOUT+ 0.3V)
FB (MAX1616) to GND .........................-0.3V to (VOUT+ 0.3V)
OUT to GND...........................................................-0.3V to 30V
OUT Short-Circuit to GND...............................................30sec
Continuous OUT Current.....................................................40mA
Continuous Power Dissipation (TA= +70°C) (Note 1)
SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW
Operating Temperature Range
MAX161_EUK-T ...............................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Note 1:See Operating Region and Power Dissipationsection.
FB Input Current (MAX1616)IFB-101230nAVFB= 1.3V
FB Threshold (MAX1616)
(Note 3)VFBT
FB = OUT,
VIN= 6V to 28V= +25°C,
ILOAD= 1mA
1.181.28TA= TMINto TMAX,
ILOAD= 5μA to 30mA
Output Voltage (MAX1615)
(Note 3)3.153.48ILOAD= 5μA to 30mA, = TMINto TMAX,
VIN= 6V to 28V
5/3= GND
4.755.255/3= OUT
4.955.055.155/3= OUT
3.263.333.40ILOAD= 1mA, = +25°C,
VIN= 6V to 28V
5/3= GND
Dropout Supply Current70μAOutput set to 5V,
VIN= 4VTA= +25°C
TMIN= TMINto TMAX= +25°C
Start-Up OvershootVOSH0.5%VOUTRL= 500Ω, COUT= 10μF within 90% of nominal
output voltage
PARAMETERSYMBOLMINTYPMAXUNITSShutdown Supply CurrentIIN3μA1.5
Minimum Load Current5μA
Input Voltage RangeVIN428V
6.28Supply CurrentIIN15μA
Output Current Limit100mA
OUT Reverse Leakage
Current70μA
Capacitive Load
Requirements (Note 5)
0.16μF/mA
Start-Up Time Response1ms
CONDITIONSSHDN= GND
(shutdown mode)
VIN= 6V
IN = unconnected, VOUTforced to 5V
SHDN= IN, TA= +25°C
MAX1615
SHDN= IN, VIN= 6V to 28V, TA= TMINto TMAX
Rising edge of IN or SHDNto OUT within specifi-
cation limits, RL= 500Ω, COUT= 6.8μF,
VOUTset to 5V
MAX16160.23
Dropout Voltage∆VDO350mVILOAD= 30mA (Note 4)
igh-Voltage, Low-Power Linear Regulatorsfor Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(VIN= 15V, SHDN= VIN, ILOAD= 5μA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
Note 2:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed through
correlation using standard quality-control (SQC) methods.
Note 3:Pulse tested at VIN= 28V, ILOAD= 30mA to avoid exceeding package power-dissipation limits.
Note 4:Guaranteed by design. Tested with VOUTset to 5V. Dropout voltage is tested by reducing the input voltage until VOUTdrops
to 100mV below its nominal value, measured with VINstarting 2V above VOUT.
Note 5:Use at least 1μF minimum for light loads. Add 0.125μF/mA (0.2μF/mA for the MAX1616) for loads greater than 100μA,
not production tested. See Capacitor Selectionin the Applications Informationsection.30
SAFE LOAD-CURRENT
OPERATING AREA
vs. SUPPLY VOLTAGEX1615-01
SUPPLY VOLTAGE (V)
(m5252015
POWER-
DISSIPATION
LIMIT REGION
VOUT = 5V30
GROUND CURRENT
vs. SUPPLY VOLTAGE
AT VARIOUS LOADSSUPPLY VOLTAGE (V)
(m252015
65mA
55mA
45mA
35mA
15mA
5mA25mA
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
(μ201510
TA = +85°C
TA = +25°C
TA = -40°C
__________________________________________Typical Operating Characteristics(VOUTset to 5V, TA = +25°C, unless otherwise noted.)
SHDNInput Threshold
Voltage
CONDITIONS0.25VIL
UNITSMINTYPMAXSYMBOLPARAMETERSHDNInput CurrentVSHDN= 0V or 15VμA-11
Thermal-Shutdown
TemperatureVSHDN= 0V or 15V, hysteresis = +20°C°C150TSHDN
VIH1.4
igh-Voltage, Low-Power Linear Regulatorsor Notebook Computers100μs/div
LOAD-TRANSIENT RESPONSEIOUT
30mA/div
VOUT
50mV/div
MAX1615-08
____________________________Typical Operating Characteristics (continued)(VOUTset to 5V, TA = +25°C, unless otherwise noted.)
DROPOUT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
AX1615-09
SUPPLY VOLTAGE (V)
(μ
TA = +85°C
TA = +25°C
TA = 0°C
TA = -40°C
DROPOUT VOLTAGE
vs. LOAD CURRENT
AX1615-10
LOAD CURRENT (mA)
- V
T (V
50μs/div
LINE-TRANSIENT RESPONSE+20V
VOUT
50mV/div
VIN
COUT
4.7μF
CIN
10μF
MAX1615-07
+10V
500μs/div
TIME TO EXIT SHUTDOWN+5V
+5V
OUT
SHDN
MAX1615-06
VIN = 10V
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
AX1615-04
SUPPLY VOLTAGE (V)
(μ2016128
RIPPLE REJECTION vs. FREQUENCY
FREQUENCY (kHz)
(d10.1
ILOAD = 10mA
_______________Detailed DescriptionThe MAX1615/MAX1616 low-quiescent-current linear
regulators are designed primarily for high input voltage
applications. The MAX1615 supplies a preselected 3.3V
or 5.0V output for loads up to 30mA. The MAX1616
provides an adjustable voltage from 1.24V to 28V. The
maximum output current is a function of the package’s
maximum power dissipation for a given temperature. A
5μA load is required to maintain output regulation.
The MAX1615’s output voltage is fed back through an
internal resistor voltage divider connected to OUT. Set
the output voltage to either 3.3V or 5.0V with the 5/3pin.
Select the 5V output by connecting 5/3to OUT, or the
3.3V output by connecting 5/3to GND.
The MAX1616 uses external feedback, allowing the out-
put voltage to be set by external resistors (see Setting
the MAX1616 Output Voltage section). The typical FB
threshold is at 1.24V.
ShutdownThe device enters shutdown mode when SHDNis low.
In shutdown mode, the pass transistor, control circuit,
reference, and all biases turn off, reducing the supply
current to below 1μA. Connect SHDNto IN for automatic
start-up.
Current LimitOutput current is limited to 100mA (typical). The current
limit exceeds the 30mA (max) safe operating limit. The
output can be shorted to ground for 30 seconds without
damaging the part.
Thermal-Overload ProtectionWhen the junction temperature exceeds TJ= +150°C,
the thermal sensor sends a signal to the 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 temperature cools by
+20°C (typical), resulting in a pulsating output during
continuous thermal-overload conditions.
Operating Region and Power DissipationMaximum power dissipation depends on the thermal
resistance of the case and circuit board, the tempera-
ture difference between the die junction and ambient
air, and the rate of air flow. The device’s power dissipa-
igh-Voltage, Low-Power Linear Regulators
for Notebook Computers
______________________________________________________________Pin DescriptionINPositive Input Voltage. Connect to a +4V to +28V supply.GNDGround5/3Preset Output Voltage Select. Connect to GND for 3.3V output or to OUT
for 5.0V output.SHDNShutdown, active low input. Connect to IN for automatic start up.
CURRENT
LIMIT
VREF
OUT
GND
SHDN
5/3
(MAX1615)
(MAX1616)
MAX1615
MAX1616
Figure 1. Functional Diagram
PIN
NAMEFUNCTIONMAX1615MAX1616OUTRegulator Output3FBFeedback Input. Regulates to 1.24V nominally.4
igh-Voltage, Low-Power Linear Regulatorsor Notebook Computers___________________Chip InformationTRANSISTOR COUNT: 386
tion is P = IOUT(VIN- VOUT). The power dissipation at
+70°C ambient is 571mW (see Absolute Maximum
Ratings). The thermal resistance junction-to-case of the
SOT23-5 package is 81°C/W, and the maximum safe
junction temperature is +150°C.
The GND pin performs the dual function of providing an
electrical connection to ground and channeling heat
away. Connect GND to ground using a large pad or
ground plane.
__________Applications Information
Setting the MAX1616 Output VoltageSet the MAX1616’s output voltage with two resistors, R1
and R2 (Figure 2). Choose R2 = 250kΩto maintain a
5μA minimum load and calculate R1 using the following
equation:
where VFBT= 1.24V (typical).
Capacitor Selection Use a 0.1μF minimum capacitor on the input. Higher
values will improve line-transient response.
Use 1μF minimum on the output, or 4.7μF for the full
30mA load current (6.8μF, MAX1616). Otherwise, use
1μF plus 0.125μF/mA (0.2μF/μA, MAX1616). For output
voltages less than 3.3V, use 15μF instead of 6.8μF. The
output capacitor’s effective series resistance (ESR) must
be less than 1Ωfor stable operation.
Output Voltage Noise The MAX1615/MAX1616 typically exhibit 5mVp-p of
noise during normal operation. This is negligible in
most applications. In applications that include analog-
to-digital converters (ADCs) of more than 12 bits, con-
sider the ADC’s power-supply-rejection specifications.
Transient Response The Typical Operating Characteristicsshow the
MAX1615/MAX1616’s load-transient response. Two of
the output response’s components can be observed on
the load-transient graph: a DC shift from the output
impedance due to the different load currents, and the
transient response. Typical step changes in the load
current from 10mA to 20mA produce 50mV transients.
Increasing the output capacitor’s value attenuates tran-
sient spikes.
R1 = R2 V
OUT
FBT −⎛⎜⎞⎟1
Table 1. Surface-Mount Capacitor
Manufacturers
MANUFACTURERCAPACITORSprague593D, 595 series
Electrolytic
AVXTPS series
TYPEMatsuo267 series
Ceramic
AVXX7R
MatsuoX7R
Table 2. Component Suppliers
PHONEFAX(803) 626-3123
(714) 960-6492
(603) 224-1430
AVX(803) 946-0690
Sprague
SUPPLIERMatsuo(714) 969-2491
(603) 224-1961OUT
SHDN
GND
6V TO
28V0.1μF6.8μF*
OUTPUT
VOLTAGE
MAX1616
*15μF for VOUT <3.3V
Figure 2. MAX1616 Typical Application Circuit
