CAT6217 반도체 회로 부품 판매점
150mA CMOS LDO Regulator
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 Catalyst Semiconductor |
150mA CMOS LDO Regulator
www.DataSheet4U.com
CAT6217
FEATURES
Guaranteed 150mA output current
Low dropout voltage of 90mV typical at 150mA
Stable with 1μF ceramic output capacitor
External 10nF bypass capacitor for low noise
Quick-start feature
No-load ground current of 55μA typical
Full-load ground current of 80μA typical
±1.0% output voltage initial accuracy
±2.0% accuracy over temperature
“Zero” current shutdown mode
Current limit and Under voltage lockout
Thermal protection
Thin SOT23-5 package
APPLICATIONS
Cellular phones
Battery-powered devices
Consumer Electronics
DESCRIPTION
The CAT6217 is a 150mA CMOS low dropout
regulator that provides fast response time during load
current and line voltage changes.
The quick-start feature allows the use of an external
bypass capacitor to reduce the overall output noise
without affecting the turn-on time of just 150μs.
With zero shutdown current and low ground current of
55μA typical, the CAT6217 is ideal for battery-
operated devices with supply voltages from 2.3V to
5.5V. An internal under voltage lockout circuit disables
the output at supply voltages under 2.1V typical.
The CAT6217 offers 1% initial accuracy and low
dropout voltage, 90mV typical at 150mA. Stable
operation is provided with a 1μF ceramic capacitor,
reducing required board space and component cost.
Other features include output short-circuit current limit
and thermal protection.
The device is available in the low profile (1mm max
height) 5-lead thin SOT23 package.
For Ordering Information details, see page 9.
PIN CONFIGURATION
TSOT-23 5-Lead
(1mm height)
VIN 1
GND 2
EN 3
5 VOUT
4 BYP
Top View
TYPICAL APPLICATION CIRCUIT
VIN
2.3V
to 5.5V
CIN VIN VOUT
1µF CAT6217
OFF ON
EN BYP
GND
VOUT
COUT
1µF
CBYP (Optional)
10nF
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-4011 Rev. A
CAT6217
PIN DESCRIPTIONS
Pin # Name Function
1 VIN Supply voltage input.
2 GND Ground reference.
3
EN
Enable input (active high); a 2.5MΩ
pull-down resistor is provided.
Optional bypass capacitor connection
4 BYP for noise reduction and PSRR
enhancing.
5 VOUT LDO Output Voltage.
BLOCK DIAGRAM
VIN
VIN EN
BYP
Reference
www.DataSheet4U.com
LDO
Shutdown
Switch
GND
VOUT
VOUT
Figure 2. CAT6217 Functional Block Diagram
PIN FUNCTION
VIN is the supply pin for the LDO. A small 1μF
ceramic bypass capacitor is required between the VIN
pin and ground near the device. When using longer
connections to the power supply, CIN value can be
increased without limit. The operating input voltage
range is from 2.3V to 5.5V.
EN is the enable control logic (active high) for the regulator
output. It has a 2.5MΩ pull-down resistor, which
assures that if EN pin is left open, the circuit is disabled.
VOUT is the LDO regulator output. A small 1μF
ceramic bypass capacitor is required between the VOUT
pin and ground for stability. For better transient
response, its value can be increased to 4.7μF.
The capacitor should be located near the device. ESR
domain is 5mΩ to 500mΩ. VOUT can deliver a
maximum guaranteed current of 150mA. A 250Ω
internal shutdown switch discharges the output
capacitor in the no-load condition.
GND is the ground reference for the LDO. The pin
must be connected to the ground plane on the PCB.
BYP is the reference bypass pin. An optional 0.01μF
capacitor can be connected between BYP pin and
GND to reduce the output noise and enhance the
PSRR at high frequency.
ABSOLUTE MAXIMUM RATINGS (1)
Parameter
VIN
VEN, VOUT
Junction Temperature, TJ
Power Dissipation, PD
Storage Temperature Range, TS
Lead Temperature (soldering, 5 sec.)
ESD Rating (Human Body Model)
Rating
0 to 6.5
-0.3 to VIN+0.3
+150
Internally Limited (2)
-65 to +150
260
3
Unit
V
V
°C
mW
°C
°C
kV
RECOMMENDED OPERATING CONDITIONS (3)
Parameter
Range
VIN 2.3 to 5.5
VEN 0 to VIN
Junction Temperature Range, TJ
-40 to +125
Package Thermal Resistance (SOT23-5), θJA
235
Typical application circuit with external components is shown on page 1.
Unit
V
V
°C
°C/W
Notes:
(1) Exceeding maximum rating may damage the device
(2) The maximum allowable power dissipation at any TA (ambient temperature) is PDmax = (TJmax – TA)/θJA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
(3) The device is not guaranteed to work outside its operating rating.
Doc. No. MD-4011 Rev. A
2 © 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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CAT6217 regulator
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