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MAX1616EUK+T

P1-P3P4-P6P7-P8
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
4 _______________________________________________________________________________________
100µs/div
LOAD-TRANSIENT RESPONSE
I
OUT
30mA/div
V
OUT
50mV/div
MAX1615-08
____________________________Typical Operating Characteristics (continued)
(V
OUT
set to 5V, T
A
= +25°C, unless otherwise noted.)
50µs/div
LINE-TRANSIENT RESPONSE
+20V
V
OUT
50mV/div
V
IN
C
OUT
4.7µF
C
IN
10µF
MAX1615-07
+10V
500µs/div
TIME TO EXIT SHUTDOWN
+5V
+5V
OUT
0V
SHDN
MAX1615-06
V
IN
= 10V
0V
_______________Detailed Description
The 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 5/3 pin.
Select the 5V output by connecting 5/3 to OUT, or the
3.3V output by connecting 5/3 to 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.
Shutdown
The device enters shutdown mode when SHDN is low.
In shutdown mode, the pass transistor, control circuit,
reference, and all biases turn off, reducing the supply
current to below 1µA. Connect SHDN to IN for automatic
start-up.
Current Limit
Output 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 Protection
When the junction temperature exceeds T
J
= +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 Dissipation
Maximum 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-
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
_______________________________________________________________________________________ 5
______________________________________________________________Pin Description
1 IN Positive Input Voltage. Connect to a +4V to +28V supply.
2 GND Ground
4
5/3
Preset Output Voltage Select. Connect to GND for 3.3V output or to OUT
for 5.0V output.
5
SHDN
Shutdown, active low input. Connect to IN for automatic start up.
CURRENT
LIMIT
VREF
OUT
GND
SHDN
5/3
(MAX1615)
FB
(MAX1616)
IN
MAX1615
MAX1616
Figure 1. Functional Diagram
1
2
PIN
—
5
NAME FUNCTION
MAX1615 MAX1616
3 OUT Regulator Output3
— FB Feedback Input. Regulates to 1.24V nominally.4
MAX1615/MAX1616
High-Voltage, Low-Power Linear Regulators
for Notebook Computers
6 _______________________________________________________________________________________
___________________Chip Information
TRANSISTOR COUNT: 386
tion is P = I
OUT
(V
IN
- V
OUT
). 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 Voltage
Set the MAX1616’s output voltage with two resistors, R1
and R2 (Figure 2). Choose R2 = 250kΩ to maintain a
5µA minimum load and calculate R1 using the following
equation:
where V
FBT
= 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 1Ω for 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 Characteristics show 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
V
OUT
FBT
−
⎛
⎝
⎜
⎞
⎠
⎟
1
Table 1. Surface-Mount Capacitor
Manufacturers
MANUFACTURER CAPACITOR
Sprague 593D, 595 series
Electrolytic
AVX TPS series
TYPE
Matsuo 267 series
Ceramic
AVX X7R
Matsuo X7R
Table 2. Component Suppliers
PHONE FAX
(803) 626-3123
(714) 960-6492
(603) 224-1430
AVX (803) 946-0690
Sprague
SUPPLIER
Matsuo (714) 969-2491
(603) 224-1961
IN
OUT
FB
SHDN
GND
6V TO
28V
0.1µF
6.8µF*
R1
R2
OUTPUT
VOLTAGE
MAX1616
*15µF for V
OUT
<3.3V
Figure 2. MAX1616 Typical Application Circuit
P1-P3P4-P6P7-P8

MAX1616EUK+T

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Buy MAX1616EUK+T
Manufacturer:
Maxim Integrated
Description:
Linear Voltage Regulators Linear Regulator for Notebooks
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