Document
CM3102 Micropower 1.2V/150mA CMOS LDO Regulator with Power Good
Features
• 1-5ms Power Good (PG) control signal • Regulated 1.2V output • 150mA output current • Low quiescent operating current (90µA typical) www.DataSheet4U.com • "Zero" disable mode current • Foldback current limiting protection • Thermal shutdown protection • Stable with low-ESR capacitors • SOT23-5 package • "MIC5258" pinout • Lead-free version available
Product Description
The CM3102 is a low quiescent current (90uA) regulator that delivers up to 150mA of load current at a fixed 1.2V output. In addition, the CM3102 features a Power Good output signal (PG) that goes open drain 1 to 5 ms after the output voltage has exceeded typically 93% of its nominal level. A dedicated control input (EN, Active High) has been included for power-up sequencing flexibility. When this input is taken low, the regulator is disabled. In this state, the supply current will drop to near zero. An internal discharge MOSFET resistance (500Ω) will force the output to ground whenever the device has been shutdown. The CM3102 is fully protected, offering both overload current limiting and high temperature thermal shutdown. Available in a tiny SOT23 package, the device is ideal for space critical applications. The CM3102 is available with optional lead-free finishing.
Applications
• • • • • Pentium 4 Motherboards Processor Power-up Sequencing Desktop, Notebook and Palmtop Computers PC Cards Peripheral Adapter Cards
Pentium 4 Motherboard Application Circuit
CM3102-12Sx
10Ω
Simplified Electrical Schematic
1.2V
VCC3
IN EN GND .1µF*
OUT PG
VCCVID
PG
IN
1.2V/150mA
OUT
EN
.1µF
+
VREF 1.2V
* Input capacitor optional.
-
Typical Application Circuit
47kΩ
+
CM3102-12Sx
VREF X 0.93
2.5ms
PG
VIN EN 1µF* GND
IN EN GND
OUT PG 1µF
VOUT
1X
PG
GND
* Input capacitor optional.
© 2004 California Micro Devices Corp. All rights reserved. 01/20/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846
L
www.calmicro.com
1
CM3102
PACKAGE / PINOUT DIAGRAM
Top View
IN 1 5 OUT
BA12/BB12
GND
2
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EN
3
4
PG
5-pin SOT23
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN 1 NAME IN DESCRIPTION Positive input voltage for the regulator. The internal loading on this input is typically 300µA whenever the regulator is enabled, and less than 1µA when the regulator is disabled. Although an input filter capacitor is not required, it is recommended that a 1µF ceramic capacitor be used for additional filtering and stability if this pin is greater than 2 inches from the main input filter. The negative reference for all voltages. Enable/shutdown input. When EN is asserted high (VEN ≥ 1.6V), the regulator is enabled. When EN is asserted low (VEN ≤0.4V), the regulator’s series pass transistor is forced into a high impedance mode and an internal discharge resistance (500Ω) is applied to the output to quickly reduce the output voltage to 0 volts. 4 PG Power Good output. This is an open drain output and functions as a supply voltage supervisor for the output voltage. It is asserted low when the output falls below 89% of its nominal value. This output becomes inactive when VOUT remains above 97% of its nominal value for 1 to 5ms. The regulated voltage output. An output capacitor of 1µF is recommended to minimize any transient load disturbances under normal operating conditions. Additional output capacitance can be used to further improve transient load response.
2 3
GND EN
5
OUT
Ordering Information
PART NUMBERING INFORMATION
Standard Finish Ordering Part Regulator CM3102-12 Pins 5 Package SOT23-5 Number1 CM3102-12ST Part Marking BA12 Lead-free Finish Ordering Part Number1 CM3102-12SO Part Marking BB12
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846
L
www.calmicro.com
01/20/04
CM3102
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER ESD Protection (HBM) Pin Voltages VIN VOUT VEN Storage Temperature Range Operating Temperature Range Ambient Junction Power Dissipation (See note 1) RATING +2000 [GND - 0.6] to +6.0 [GND - 0.6] to [VIN+0.6] [GND - 0.6] to [VIN+0.6] -40 to +150 0 to +70 0 to +150 Internally Limited UNITS V V V V °C °C °C W
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Note 1: The power rating is based on a printed circuit board heat spreading capability equivalent to 2 square inches of copper connected to the GND pins. Typical multi-layer boards using power plane construction will provide this heat spreading ability without the need for additional dedicated copper area. Please consult with factory for thermal evaluation assistance.
STANDARD OPERATING CONDITIONS
PARAMETER VIN Ambient Operating Temperature Range Load Current COUT VALUE 2.7 to 5.5 0 to +70 0 to 150 1 +20% UNITS V °C mA µF
© 2004 California Micro Devices Corp. All rights reserved. 01/20/.