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MIC4690YM-TR

P1-P3P4-P6P7-P9P10-P12
April 2005 1 MIC4690
MIC4690 Micrel
MIC4690
500kHz 1A SuperSwitcher™ Buck Regulator
General Description
The MIC4690 SuperSwitcher™ is an easy-to-use, 500kHz
step-down PWM voltage regulator. The MIC4690 achieves
over 1A of continuous output current over a wide input voltage
range in an 8-lead SO (small outline) package.
The high switching frequency of the MIC4690 allows the
smallest surface-mount inductors and capacitors to be used.
Internal compensation ensures fast transient response and a
minimum amount of external components.
The MIC4690 features a power SO-8 package with a special
lead frame that allows over 1A of continuous current. The
MIC4690, housed in an SO-8, can replace larger TO-220 and
TO-263 packages in many applications.
The MIC4690 allows for a high degree of safety. It has a wide
input voltage range of 4V to 34V, allowing for it to be used in
applications where input voltage transients may be present.
Built-in safety features include over-current protection, fre-
quency foldback protection, and thermal shutdown.
The MIC4690 is available in an 8-lead SO package with a
junction temperature range of –40°C to +125°C.
Typical Application
Power
SOP-8
2.5V Adjustable Converter
µ
µ
µ
Power
SOP-8
1.8V Adjustable Converter
Features
• SO-8 package with over 1A output current
• Fixed 500kHz operation
• Wide 4V to 34Vinput voltage range
• Output voltage adjustable to 1.23V
• All surface mount solution
• Internally compensated with fast transient response
• Up to 85% efficiency
• Overcurrent protection
• Frequency foldback short-circuit protection
• Thermal shutdown
Applications
• Simple 1A step-down (buck) regulator
• Replacement of TO-220 and TO-263 designs
• 12V to 5V/3.3V/2.5V/1.8V/1.5V conversion
• 5V to 2.5V/1.8V/1.5V conversion
• On-card switching regulators
• Hard disk drives
• Cable modems
• Positive-to-negative converters
• Simple battery chargers
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
SuperSwitcher is a trademark of Micrel, Inc.
MIC4690 Micrel
MIC4690 2 April 2005
Pin Configuration
1SHDN
VIN
SW
FB
8 GND
GND
GND
GND
7
6
5
2
3
4
SOP-8 (M)
Pin Description
Pin Number Pin Name Pin Function
1 SHDN Shutdown (Input): Logic low enables regulator. Logic high (>1.5V) shuts
down regulator.
2 VIN Supply Voltage (Input): Unregulated +4V to +30V continuous supply
voltage, with a maximum +34V transient voltage.
3 SW Switch (Output): Emitter of NPN output switch. Connect to external storage
inductor and Schottky diode.
4 FB Feedback (Input): Connect to output on fixed output voltage versions, or to
1.23V-tap of voltage-divider network for adjustable version.
5-8 GND Ground
Ordering Information
Part Number
Standard Lead-Free Voltage Temperature Range Package
MIC4690BM MIC4690YM Adjustable –40°C to +125°C 8-lead SOP
April 2005 3 MIC4690
MIC4690 Micrel
Electrical Characteristics
V
IN
= 12V, V
OUT
= 5V; I
LOAD
= 500mA; V
SHDN
= 0V, T
J
= 25°C, unless otherwise noted. Bold values indicate –40°C ≤ T
J
≤ +125°C.
Parameter Condition Min Typ Max Units
Feedback Voltage (±1%) 1.217 1.230 1.243 V
(±2%) 1.205 1.255 V
8V ≤ V
IN
≤ 30V, 0.1A ≤ I
LOAD
≤ 1A, V
OUT
= 5V 1.193 1.230 1.267 V
1.180 1.280 V
Maximum Duty Cycle V
FB
= 1.0V 90 93 %
Quiescent Current V
FB
= 1.5V 7 12 mA
Standby Quiescent Current V
SHDN
= 5V (regulator off) 30 100 µA
V
SHDN
= 12V (regulator off) 1.5 µA
Frequency Foldback V
FB
= 0V 220 300 KHz
Oscillator Frequency 450 500 550 kHz
Saturation Voltage I
OUT
= 1A 1.2 V
Output Leakage Current V
IN
= 30V, V
SHDN
= 5V, V
SW
= 0V 50 500 µA
V
IN
= 30V, V
SHDN
= 5V, V
SW
= –1V 4 20 mA
Short Circuit Current Limit V
FB
= 0V, V
OUT
= 0V, See
Test Circuit
1.3 2.5 3.0 A
Shutdown Pin Input Logic Level regulator off 2 1.5 V
regulator on 1.25 0.8 V
Shutdown Pin Input Current V
SHDN
= 5V (regulator off) –10 –0.7 10 µA
V
SHDN
= 0V (regulator on) –10 –1.5 10 µA
Thermal Shutdown @ T
J
160 °C
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. With input voltages above the operating rating, the device may be damaged if a short-circuit is applied to the output. The device will otherwise
not be damaged up to its absolute maximum voltage rating.
Note 3. Absolute maximum rating is intended for voltage transients only, prolonged dc operation is not recommended.
Note 4. Devices are ESD sensitive. Handling precautions recommended.
Note 5. Measured on 1" square of 1 oz. copper FR4 printed circuit board connected to the device ground leads.
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
IN
), Note 3 ......................................+34V
Shutdown Voltage (V
SHDN
) ............................. –0.3V to V
IN
Steady-State Output Switch Voltage (V
SW
) ....... –1V to V
IN
Feedback Voltage (V
FB
) ..............................................+12V
Storage Temperature (T
S
) ....................... –65°C to +150°C
ESD Rating .............................................................. Note 4
Operating Ratings (Note 2)
Supply Voltage (V
IN
) ....................................... +4V to +30V
Junction Temperature Range (T
J
) ........... –40°C to +125°C
Package Thermal Resistance
(θ
JA
), Note 5 ........................................................ 63°C/W
(θ
JC
), ................................................................... 20°C/W
P1-P3P4-P6P7-P9P10-P12

MIC4690YM-TR

Mfr. #:
Buy MIC4690YM-TR
Manufacturer:
Microchip Technology / Micrel
Description:
Switching Voltage Regulators 500KHz Simple Buck Regulator
Lifecycle:
New from this manufacturer.
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