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Global Mixed-mode Technology Inc.
G9611
Low-Dropout, 300mA Linear Regulator with Reset
Features
300mA Output Current, with Foldback Current Limiting High Ripple Rejection 2% Output Accuracy 2% Reset Threshold Accuracy Externally Programmable Reset Time Delay Generator Internal 300mA P-Channel Pass Transistor 320A quiescent Current Thermal Overload Protection SOP 8 Package
General Description
The G9611 are low-dropout, linear regulator with reset function supply 3.4V, 3.3V or 2.5V output for currents up to 300mA. They are available in a 700mW SOP 8 package. Typical dropouts are 320mV at 300mA. Shutdown turns off linear regulator function. Other features include foldback current limiting and thermal overload protection. The reset function in G9611 detect VCC level with hysteresis, keeping it asserted for time delay determined by external capacitor. The reset output is active low open-drain output. The detection threshold are 3.9V or 4.2V. The output is preset at 3.4V for the G9611A, 3.3V for the G9611B/C, and 2.5V for G9611D. The reset threshold is preset at 4.2V for G9611 A/B/D and 3.9V for G9611C.
Applications
CD ROM or DVD ROM Slim-Type CD/DVD DVD Player
Ordering Information
PART NUMBER
G9611AP1x G9611BP1x G9611CP1x G9611DP1x
MARKING
G9611A G9611B G9611C G9611D
REGULATOR OUTPUT VOLTAGE
3.4 3.3 3.3 2.5
RESET THRESHOLD VOLTAGE
4.2 4.2 3.9 4.2
TEMP. RANGE
-40C to +85C -40C to +85C -40C to +85C -40C to +85C
PINPACKAGE
SOP-8L SOP-8L SOP-8L SOP-8L
Note: X Specify the packing type U: Tape & Reel T: Tube
Pin configuration
Typical Operation Circuit
G9611
N.C RESET
SHDN
VCC
1
2
3
4
8
7
CD GND N.C VOUT
VIN
1F
Rpull-high 10k
RESET
6
5
G9611
SHDN CD GND
VOUT
VIN
OUTPUT VOLTAGE
10F (Tantalum or Aluminum)
SOP- 8L
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Supply Voltage (IN or OUT to GND........-0.3V to +6.5V Output Short-Circuit Duration............................1 min Input Voltage ..........................-0.3V to the greater of (IN+0.3V) or (OUT + 0.3V) Continuous Power Dissipation (TA = +25C)......700mW
G9611
Operating Temperature Range............ -40C to +85C Junction Temperature..................................+160C Storage Temperature Range..............-65C to +160C Lead Temperature (soldering, 10sec)...............+260C
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
Electrical Characteristics
VIN=5V, CIN=1F, COUT=10F, SHDN =VIN, TJ =TA=25C (Note3), unless otherwise noted. Typical values for regulators are at VIN =5V.
PARAMETER
Input Voltage Output Voltage (Note 1) Load Regulation Line Regulation Dropout Voltage (Note 2) Parameter Tempco VOUT Ripple Rejection Output Noise Quiescent Current OFF Quiescent Current Foldback Current Limit Foldback Voltage Thermal Shutdown Temperature Thermal Shutdown Hysteresis SHDN Pin Input High Threshold SHDN Pin Input Low Threshold Reset Threshold Reset Threshold Hysteresis Reset Threshold Tempco CD Delay Pin Threshold Voltage CD Pin Sink Current CD Pin Pullup Resistance RESET Output Current Low RESET Function Operating Voltage
SYMBOL
VIN VOUT VLDR VLNR VDO G9611A G9611B/C
CONDITION
MIN
2.5 3.332 3.234 2.45 ---8 --------------260 650 0.6 ----1.8 0.6
TYP
--3.4 3.3 2.5 6 0.3 320 40 70 65 350 320 140 400 900 0.78 160 30 2 0.8 4.2 3.9 150 130 40 3.9 4.3 200 11.5 0.7
MAX
6.0 3.468 3.366 2.55 15 8 400 --------450 200 580 1200 0.95 ----2.3 1.1 4.29 3.99 ------4.3 --400 --0.85
UNIT
V V mV mV mV ppm/C dB
VRMS
G9611D IOUT=1mA to 300mA, VIN=VOUT +1V (VOUT+0.5V) VIN 6V, IOUT =25mA IOUT=300mA f=120HZ, IOUT=30mA f=120HZ, IOUT=300mA 20Hz to 100kHz, IOUT=30mA.
SHDN 0.4V
PSRR en IQ IQOFF ILIM VFOLDBACK TSD TSD VIH_ SHDN VIL_ SHDN VTHVHYS
A A mA V C C V V V mV ppm/C V mA k mA V
VOUTVFOLDBACK
G9611A/B/D G9611C G9611A/B/D G9611C VCC = 5V VCC=1.5V, VCD=0.5V VCC=2.5V, V RESET =0.4V
RESET sink current>10A
4.11 3.81 ------3.5 3 100 8 ---
VTCD ICD RD IOL VOP
Note 1: (VIN-VOUT) is limited to keep the product (IOUT x (VIN - VOUT)) from exceeding the package power dissipation limits. Note 2: Dropout Voltage is (VIN - VOUT) when VOUT falls to 100mV below its nominal value at VIN = VOUT+1V. For example, the G9611 is tested by measuring the VOUT at VIN = VOUT+1V, then VIN is lowered until VOUT falls 100mV below the measured value. The difference (VIN - VOUT) is then measured and defined as VDO. Note 3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN=5V,CIN=COUT=10F, SHDN =VIN, TJ=25C, unless otherwise noted)
G9611
Load transient
SHDN Pin vs. Output
Line Transient
Line Transient
Over Current Response
Short Circuit Response
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Power Supply Rejection Ratio
G9611
Power Supply Rejection Ratio
Power Supply Rejection Ratio
0.305 0.3 0.295
Safe Operating Area of G9611 SO-8
Load Current (A)
0.29 0.285 0.28 0.275 0.27 0.265 0.26 0.255 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7
TA=25C
Input -Output Voltage Differential(V)
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Pin Description
PIN NO.
1, 6 2 3 4 5 7 8
G9611
PIN NAME
N.C
RESET
SHDN
PIN FUNCTION
No Connection.
RESET Open-Drain Output remains low while VIN is below the reset threshold,
and for delay time set by CD after VIN rises above the reset threshold.
SHDN = High to enable regulator output.
SHDN = Low to shutdown regulator output.
VIN VOUT GND CD
Regulator Input. Supply voltage can range from 2.5V to 6V. Regulator Output. Sources up to 300mA. Ground External Programmable time delay is set by the capacitor connect to CD pin.
VIN
SHDN SHUTDOWN LOGIC
MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT
P
RESET
VOUT

RD CD
THERMAL PROTECTION
1.24V REFERENCE R1
R2 GND
Figure 1. Functional Diagram
Detailed Description
The G9611 are low-dropout, low-quiescent current linear regulators with reset function The regulator in G9611 supply 3.4V, 3.3V or 2.5V output for load currents up to 300mA. The reset function detect VIN. As illustrated in Figure 1, they consist of a 1.24V reference, error amplifier, MOSFET driver, P-channel pass transistor, and internal feedback voltage divider, reset threshold comparator and time delay generator. The 1.24V bandgap reference is connected to the error amplifier's inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel pass transistor. If the feedback voltage is lower than the reference, the pass transistor gate is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up, allowing less current to pass to the output. Additional blocks of linear regulator include a foldback current limiter, thermal sensor, and shutdown logic.
The G9611 also offer reset function to detect the level of VIN. They assert a reset signal whenever VIN supply voltage declines below a preset threshold (VTH), keeping it asserted for time delay set by capacitor connected to CD pin, after VIN has resen above the high reset threshold (VTH + VHYS). The RESET is an active low, open-drain output.
Internal P-Channel Pass Transistor The G9611 feature a 300mA P-channel MOSFET pass transistor. This provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-channel MOSFET requires no base drive, which reduces quiescent current considerably. PNP based regulators waste considerable amounts of current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The G9611 do not suffer from these problems and consume only 320A of quiescent current.
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Shutdown
A low input on the SHDN pin shuts down the G9611. In the off mode, the pass transistor, regulator control circuit are turned off, Only reset function is turned on, reducing the supply current below 140A. SHDN should be connected to VIN for normal operation. Use a fast comparator, Schmitt trigger, or CMOS or TTL Logic to drive the SHDN pin in and out of shutdown. Rise times should be shorter than 1s. Do not use slow RC circuits, leave SHDN open, or allow the input to linger between thresholds.
G9611
The power dissipation of G9611 is: PD = (VIN - VOUT) x IOUT The worst-case thermal resistance from case to air (CA) requirements are:
CA =
(125C -TA) PD
Foldback Current Limiting
The G9611 also include a foldback current limiter. It monitors and controls the pass transistor's gate voltage, estimating the output current and limiting it to 900mA for output voltages above 0.78V. If the output voltage drops below 0.78V, implying a short-circuit condition, the output current is limited to 400mA.
Use larger copper pad area to obtain specific heat sink thermal resistance values for larger output current, higher input-output difference, and higher ambient temperature. CD Capacitor Selection The reset timeout delay is set by internally pull-up RD (typical value 200k) and external CD. When the voltage at CD pin exceeds the buffer threshold, typically 0.8 VCC, the RESET output high. The voltage detector and buffer have built-in hysterisis to prevent erratic reset operation. For CD = 0.1F, typical reset time delay is 30ms. The formula of delay time is: T(ms) = 303 x CD(F) Regulator Output Capacitor Selection and Regulator Stability Normally, use capacitors 0.1F minimum on the input and 10F minimum on the output of the G9611. The larger input capacitor values provide better supply noise rejection and line-transient response. Improve load transient response, stability, and power-supply rejection by using large output capacitors. For stable operation over the full temperature range and with load current up to 300mA, 10F tantalum or 47F aluminum minimum is recommended. Too small capacitors with small ESR can result in oscillation. Transient Considerations The Typical Operating Characteristics show the G9611 load-transient response. Two components of the output response can be observed on the load-transient graphs--a DC shift from the output impedance due to the different load currents, and the transient response. Typical transients for step changes in the load current from 5mA to 500mA are 0.1V. Increasing the output capacitor's value attenuates transient spikes.
Thermal Overload Protection
Thermal overload protection limits total power dissipation in the G9611. When the junction temperature exceeds TJ = +160C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC's junction temperature cools by 30C, resulting in a pulsed output during thermal overload conditions. Thermal overload protection is designed to protect the G9611 in the event of fault conditions. For continual operation, the absolute maximum junction temperature rating of TJ = +160C should not be exceeded. Operating Region and Power Dissipation Maximum power dissipation of the G9611 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipation across the device is P = IOUT (VIN-VOUT). The resulting maximum power dissipation is: PMAX= (TJ-TA) (JC+CA)
where (TJ -TA) is the temperature difference between the G9611 die junction and the surrounding air, JC is the thermal resistance of the package chosen, and CA is the thermal resistance through the printed circuit board, copper traces and other materials to the surrounding air. The thermal resistance of SOP-8 is JC = 192C/W.
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
C
G9611
E
H
L D 7 (4X)
A2 y B A1
A
e
Note: 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. Tolerance 0.10mm unless otherwise specified 4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact. SYMBOL
A A1 A2 B C D E e H L y
MIN.
1.35 0.10 ----0.33 0.19 4.80 3.80 ----5.80 0.40 ----0
DIMENSION IN MM NOM.
1.60 ----1.45 ----------------1.27 -----------------
MAX.
1.75 0.25 ----0.51 0.25 5.00 4.00 ----6.20 1.27 0.10 8
MIN.
0.053 0.004 ----0.013 0.007 0.189 0.150 ----0.228 0.016 ----0
DIMENSION IN INCH NOM.
0.063 ----0.057 ----------------0.050 -----------------
MAX.
0.069 0.010 ----0.020 0.010 0.197 0.157 ----0.244 0.050 0.004 8
Taping Specification
Feed Direction Typical SOP Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 1.4 Jun 29, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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