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Global Mixed-mode Technology Inc.
G5180
Switching Regulator Power Controller
Features
2.2V~6V Supply Voltage Operating Range Low Current Consumption: 5mA in Operation, 1A or Less in Stand-by 20kHz to 1MHz Operation Frequency Range Built-In Soft Start Circuit Built-In Timer-Latch Type Short Circuit Detection and Protection (SCP) Circuit Use External Resistor to Set a Fixed Output Current
General Description
The G5180 is a single-channel PWM control IC for low voltage DC/DC conversion incorporating a soft start function and short circuit detection function. The device has a low minimum operating voltage of 2.2V and is ideal for the power supply of battery-operated electronic equipment.
Applications
LCD Displays PDAs Digital Still Cameras
Ordering Information
ORDER MARKING NUMBER
G5180P1U G5180P8U G5180 G5180
TEMP. RANGE
0C to 85C 0C to 85C
PACKAGE (Pb free)
SOP-8 MSOP-8
Note: P1: SOP-8; P8: MSOP-8 U: Tape & Reel
Pin Configuration
Typical Application Circuit
18k
G5180
G5180 INSCP VCC BR/CTL 1 2 3 4 8 7 6 5 FB OSC GND OUT
INSCP VCC FB OSC GND
22H VO 5V
3V
33F 2k 0.1F ON OFF CTL
VCC
10F
BR/CTL OUT 390 270pF 3k 0.1F
SOP-8 / MSOP-8
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Power Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . .7V VCC, IN- to GND. . . . . . . . . . . . . . . . . . . .-0.3V to +7V SCP, BR/CTL, OUT, OSC, FB to GND . . . . . . . . . . . . . . . . . . . . . . . .. . . -0.3V to (VCC+0.3V)
G5180
Operating Temperature, TOP . . . . . . . . . . 0C to +85C Storage Temperature Range, TSTG . . .-65C to+165C Reflow Temperature (soldering, 10sec) . . . . . . 260C
Electrical Characteristics
VCC=2.2V, TA=25C, unless otherwise noted. PARAMETER
Under voltage lockout (UVLO) Soft start Threshold voltage Charging current Voltage at soft start completion
SYMBOL
VTH ICS Vts ICSCP VtSCP fOSC fV fT VT VTV VTT IB AV BW VOMax+ VOMaxIOMax+ IOMaxTDUTY VOH1 VOH2 VOL1 VOL2 IO + IORO VBR IOFF ION IBR ICCS ICC
CONDITION
MIN TYP MAX UNIT
1.3 1.5 -1 0.8 -1 0.8 500 2 5 500 5 1 0 140 6 2 0.05 -60 700 85 1.2 1 0.1 0.1 -30 60 30 0.3 --------2 1.7 -0.7 0.9 -0.7 0.9 ------520 10 --1 180 ----0.2 -24 --95 ----0.2 0.2 -20 --50 0.4 0 -40 -0.1 1 5 V A V A V kHz % % mV mV % A V/V MHz V V A A % V V V V mA mA k V A A mA A mA
VSCP=0V
-1.5 0.7
Short circuit detection Charging current and protection (SCP) Threshold voltage Oscillation frequency Frequency input Stability Frequency variation with temperature Input threshold voltage VT input stability VT variation with temperature Input bias current Error amplifier Voltage gain Frequency bandwidth Maximum output voltage range Output source current Output sink current Idle period ment section adjustMaximum duty cycle
VSCP=0V RT=3.0k, CT=270pF VCC=2.2V to 6V TA=0C to 85C VFB=450mV VCC=2.2 to 6V TA=0C to 85C VIN-=0V Av=0dB
-1.5 0.7 ------480 -10 ---1 100 --0.78 ----24 75 1 0.8 ------30 20 0.2 -3 ---1.8 -1 ---
Sawtooth waveform oscillator (OSC)
VFB=450mV RT=3.0k, CT=270pF, VFB=0.8V RB=390, IO=-15mA RB=750, VCC=2.2V, IO=-10mA RB=390, IO=15mA RB=750, VCC=2.2V,IO=10mA RB=390, VO=0.9V RB=390, VO=0.3V RB=390
Output voltage Output section Output source current Output sink current Pull down resistance Pin voltage Output current Setting Input off condition /Control Section Input on condition Pin current range Stand-by current Entire device Average supply current
BR/CTL pin open or VCC RB=390
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
VCC= 2V, RBR=390, RT=3k, CT=270pF, TA= 25C, unless otherwise noted.
G5180
Input Threshold Voltage VT vs. Supply Voltage VCC
Supply Current ICC vs. Supply Voltage VCC
5.0 4.5 4.0
Supply Current ICC (mA)
550 RBR = 390
Input Threshold Voltage V (mV) T
530 TA = +85C
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 Supplyt Voltage V CC (V) TA = -45C TA = +25C TA = +85C
510
TA = +55C
490 TA = -45C 470 TA = +25C
450 1.5 2.0
2.5 3.0 3.5
4.0 4.5 5.0 5.5
6.0 6.5
Supply Voltage V CC (V)
Input Threshold Voltage Variation Ratio V T/VT vs. Supply Voltage VCC
10 8 Input Threshold Voltage Variation Ratio VT/VT (%) 6 4 2 0 -2 -4 -6 -8 -10 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Supply Voltage V CC (V) 5.5 6.0 6.5 TA = -45C TA = +25C TA = +85C Input Threshold Voltage Variation Ratio VT/VT (%) 10 8 6 4 2 0 -2 -4 -6 -8 -10
Input Threshold Voltage Variation Ratio VT/V T vs. Ambient Temperature TA
V CC = 2.2V
-45 -35 -25 -15
-5
5
15
25
35
45
55
65
75
85
95 105 115 125
Ambient Temperature TA ( C)
High Level Output Voltage VOH vs. Output Source Current IO+
2.8 Low Level Output Voltage VOL (mV) High Level Output Voltage V (V) OH 2.4 2.0 1.6 1.2 0.8 0.4 0.0 0 -10 -20 -30 -40 -50 V CC = 2.2V RBR = 390 TA = + 25C 900 750 600 450 300 150 0 0
Low Level Output Voltage VOL vs. Output Sink Current IO-
V CC = 2.2V RBR = 390 TA = + 25C
20
40
60
80
100
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Output Source Current I O+ vs. BR/CTL Pin Current I BR
-120 -100 -80 -60 -40 -20 0 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -1.6 -1.8 -2.0 BR/CTL Pin Current IBR (mA) V CC=2.2V TA = +25C 800 700
BR/CTL Pin Voltage V BR (mV)
G5180
BR/CTL Pin Voltage VBR vs. BR/CTL Pin Current IBR
Output Source Current I + (mA) O
TA = +25C
600 500 V CC = 6V 400 300 200 100 0 0.0 V CC = 2.2V
0.4
0.8
1.2
1.6
2.0
2.4
BR/CTL Pin Current IBR (mA)
Oscillation Freuency fosc vs. Timing Resistor RT
10000 TA = + 25C
Oscillation Frequency fosc (kHz)
Oscillation Frequency fosc vs. Maximum Duty Cycle
100
CT = 270pF
CT = 100pF
Maximum Duty Cycle (%)
95 90 85 80 75 70 65 60
1000
V CC = 2.2V CT = 270pF TA = 25C
100
10
CT = 10000pF CT = 3300pF CT = 1000pF
1 1 Timing Resistor RT (k) 10
10
100 Oscillation Frequency fosc (kHz)
1000
Frequency variation ratio f/f vs. Supply Voltage VCC
10 8 Frequency Variation Ratio f/f (%) 6 4 2 0 -2 -4 -6 -8 -10 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 TA = +85C TA = -45C TA = +25C Frequency Variation Ratio f/f (%) RT = 3k CT = 270pF 10 8 6 4 2 0 -2 -4 -6 -8 -10
Frequency variation ratio f/f vs. Ambient Temperature TA
V CC = 2.2V RT = 3K CT = 270 pF
-45 -35 -25 -15
-5
5
15
25
35
45
55
65
75
85
95 105 115 125
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Recommended Minimum Footprint
MSOP-8 SOP-8
G5180
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2 3 4 5 6 7 8
G5180
NAME
INSCP VCC BR/CTL OUT GND OSC FB
I/O
I I O O
FUNCTION
Error amplifier inverting input Soft start and SCP setting capacitor connection Power supply Output current setting and control Output Ground Capacitor and resistor connection pin for setting the oscillation frequency Error amplifier output
Block Diagram
VCC 3
OSC 7
REFERENCE VOLTAGE
UVLO
SAWTOOTH WAVE OSCILLATOR
4 BR/CTL
1.25V IN- 1 + + 0.5V + + + + OUTPUT DRIVER CONTROL 5 OUT
FB 8
SOFT START SCP
2 SCP
6 GND
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Description
Soft Start SCP At power on, the G5180 enters the soft-start mode to prevent current spike and overshoot. The capacitor CS is charged from 0V with a constant current of 1A. The soft-start time for the duty cycle tS = 0.8 x CS (F) Switching Regulator Function When VSCP reaches 0.8V, the G5180 leaves the soft-start mode to enter the normal mode and enable the SCP function. If the output load conditions change rapidly causing the output to drop suddenly, the external capacitor CS will start to charge because the error amplifier output (FB pin) is fixed at VOMax+. When the external capacitor is charged above 0.8V, the output pin is set low. Once the latch circuit has set, the capacitor CS will be discharged to low state and the latch circuit will not reset until power is turned off or the power supply is restarted. Short-circuit detection time (or full soft-start time): tPE = 0.8 x CS (F) Setting Oscillating Frequency The oscillator circuit generates a triangular sawtooth wave with a peak of 0.8V and a trough of 0.1V using the timing capacitor (CT) and the timing resistor (RT) that are connected to the OSC pin. This oscillator can provide oscillating frequency in the range from 20kHz to 1MHz. The waveform of the OSC pin is shown as Figure 1.
Reference Voltage circuit
G5180
- t / (C
T
The cycle (T) can be determined as follows:
VX = VH x e
xR )
T
t = -CT x RT x ln (
VX VH
)
T = -C T x R T x ln(0.1 / 0.8 ) 2.1 x C T x R T [s]
A temperature-compensated reference voltage (~1.25V) is generated by the reference voltage circuit from the voltage supplied by the power supply pin (pin 3). The circuit also sets the idle period besides providing the reference voltage for the switching regulator.
Error Amplifier
The error amplifier detects the output voltage of the switching regulator and sets the PWM control signal. The voltage gain is fixed. The system is made stable by connecting a phase compensation capacitor to the FB pin (pin 8).
PWM Comparator
The voltage comparator includes one inverting and three non-inverting inputs. The comparator is a voltage to pulse width converter that controls the ON time of the output pulse depending on the level of input voltage. The output level remains high when the sawtooth wave is lower than the error amplifier output voltage, the soft start setting voltage, and the idle period setting voltage.
Output Circuit
VOSC VH 0.8V
The output circuit can drive an external NPN transistor or NMOS directly. The value of the ON/OFF current can be set by a resistor connected to the BR/CTL pin (pin 4). Stand-by mode (supply current 1A or less) can be set by connecting the BR/CTL pin (pin 4) to VCC or by making the pin open.
Under-Voltage Lockout (UVLO)
VX
VL t
0.1V
Transients during powering on or instantaneous glitches in the supply voltage can cause the control IC to malfunction and damage the system. To prevent malfunction at low input voltage, the circuit compares the supply voltage to the internal reference voltage to detect a low input voltage. Once detected, the circuit sets the output pin low.
Time
Figure 1
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
C
G5180
E
H
L D 7 (4X)
A2 y B A1
A
e
SOP-8 Package
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
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
A 8 A
G5180
E1
E
C L
1 DETAIL "A" e
0.076 C
2 A2 b D A1 A 0.25 R1 R
SEATING PLANE
GAUGE PLANE
WITH PLATING c1 BASE METAL b1 b
SECTION A-A
c
1
L
3
MSOP-8 Package SYMBOL
A A1 A2 b b1 c c1 D E1 e E L 1 2 3 R R1 JEDEC
MIN.
----0.05 0.81 0.25 0.25 0.13 0.13 2.90 2.90
DIMENSION IN MM NOM.
--------0.86 ----0.30 ----0.15 3.00 3.00 0.65 BSC 4.90 BSC 0.55 ----12 REF 12 REF ---------
MAX.
1.10 0.15 0.91 0.40 0.35 0.23 0.18 3.10 3.10
MIN.
----0.002 0.032 0.008 0.010 0.005 0.005 0.114 0.114
DIMENSION IN INCH NOM.
--------0.034 ----0.012 0.006 0.118 0.118 0.026 BSC 0.193 BSC 0.0217 ----12 REF 12 REF ---------
MAX.
0.043 0.006 0.036 0.012 0.014 0.009 0.007 0.122 0.122
0.445 0
0.648 6
0.0175 0
0.0255 6
0.09 0.09
--------MO-187AA
0.004 0.004
---------
Taping Specification
PACKAGE
SOP-8 MSOP-8
Feed Direction Typical SOP/MSOP 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.
Q'TY/REEL
2,500 ea 2,500 ea
Ver: 0.4 Preliminary Apr 27, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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