ETC GS1663

GS1663
General Description
The GS1663 ZT is a current mode boost DC-DC conv erter. Its PWM circuitry with built-in 0.15Ω
power MOSFET makes this converter highly power efficiently. Selectable high switching frequency
allows faster loop response and easy filtering with a low noise output. The non-inverting input its error
amplifier is connected to an internal 1.24V precision reference voltage. Soft-Start time can be
programmed with an external capacitor, which sets the input current ramp rate. Current mode control
and external compensation network make it easy and flexible to stabilize the system.
Features









Adjustable Output from VCC to 12V
Internal Fixed PWM Frequency: 640KHz / 1.2MHz
Frequency Selection Pin
Precision Feedback Reference Voltage: 1.24V
Internal 0.15Ω, 3A, 14V Power MOSFET
External Programmable Soft-Start Function (SS)
Shutdown Current : 0.1µA
Over Current Protection
Package: SOP-8L (EP)
Applications
 LCD Displays
 Digital Cameras
 Handheld Devices
 Portable Products
Typical Application Circuit
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GS1663
Function Block Diagram
2
3
LX
EN
4µA
SOFT
START
4
SS
Power
ON / OFF
BIAS
+
8
COMP
1
FB
+
7
FREQ
+
Error Amp.
1.24V
OSCILLATOR
PWM
Comp.
SLOPE
COMPENSATION
CONTROL
AND
DRIVER
LOGIC
LX
5
+
Σ
6
GND
Current
Sense Amp.
5μA
Typical Application
GS1663
Figure 1 Typical Application Circuits
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GS1663
Pin Descriptions
SOP-8L (EP)
Name
No. I / O
Description
COMP
1
O
Error Amplifier Compensation Output
FB
2
I
Error Amplifier Inverting Input
EN
3
I
Enable Control
GND
4
P
IC Ground
LX
5
O
Switch Output
VCC
6
P
IC Power Supply
FCPQ
7
O
Frequency Selection
SS
8
I
Soft-Start Control
EP
9
P
Exposed PAD. Must connect to GND
Typical Application
5.0V
28K
GS1663
9.1K
Figure 1 Typical Application Circuits
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GS1663
Ordering Information
Part Number
GS1663ZTR-G1
Operating Temperature
Package
MOQ
Description
-40°C ~ +85°C
SOP-8L (EP)
2500EA
Tape & Reel
Absolute Maximum Ratings
Max.
Unit
6
V
-0.3
14
V
SS,COMP to GND
-0.3
VCC+0.3
V
EN,FCPQ,FB to GND
-0.3
VCC
V
+150
℃
+150
℃
+60
℃/W
+4.2
℃/W
+260
℃
Parameter
Supply Voltage
Symbol
Conditions
Typ.
VCC
LX to GND
Junction Temperature
TJ
Storage Temperature
TS
θJA
Thermal Resistance
Min.
θJC
Lead Temperature
-65
SOP-8L (EP)
(soldering, 10 sec)
Suggested IR Re-flow Soldering Curve
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Recommended Operating Conditions
Parameter
Supply Voltage
Symbol
Conditions
VIN
Operating Temperature
Min.
Typ.
Max.
Unit
2.6
5.5
V
-40
+85
°C
DC Electrical Characteristics (VIN=3V, TA= 25°C, VFREQ=0V, unless otherwise noted)
Parameter
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
VREF
△VREF /
VREF
COMP connected to FB
1.222
1.240
1.258
V
Reference Section
Output Voltage
Line Regulation
Output Voltage Change with
Temperature
VCC=2.6V～5.5V
0.05
%/V
TA=-40℃ to 25℃
1
%
TA= 25℃ to 85℃
1
%
Under Voltage Lockout Section
Upper Threshold Voltage (VCC)
VUPPER
Lower Threshold Voltage (VCC)
VLOW
Hysteresis (VCC)
VHYS
TA=25℃
2.38
2.53
V
2.33
2.48
V
50
mV
Soft-Start Section
Reset Switch Resistance
RSS
Input Source Current
ISS
100
Ω
VSS=1.2V
1.5
4.0
7.0
μA
FREQ=GND
540
640
740
KHZ
FREQ=VCC
1.00
1.22
1.50
MHz
Oscillator Section
Frequency
Frequency Change with Voltage
Frequency Change with
Temperature
Maximum Duty Cycle
fosc
△f / △V VCC=2.6V to 5.5V
2
%/V
△f / △V TA=-40℃ to 85℃
10
%
88
%
88
%
TDUTY
FCPQ=GND
79
FCPQ=VCC
Error–Amplifier Section
FB Input Bias Current
IBIAS
VFB=1.24V
Trans-conductance
gm
△I=5μA
Voltage Gain
Av
70
140
40
nA
240
μA / V
700
V/V
3
A
Output Section
NMOS Current Limit
NMOS On Resistance
Output Leakage Current
Current-Sense Trans-Resistance
ILIM
VFB=1V,Duty Cycle=65%
RDS (ON)
ILX=1.2A
0.15
0.5
Ω
ILXOFF
VLX=12V
0.01
20
μA
RCS
0.35
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GS1663
Parameter
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Control Input Section
Input High Voltage
VIH
Input Low Voltage
VIL
Hysteresis
FREQ Pull-Down Current
EN Input Current
EN, FREQ pin
VCC=2.6V~5.5V
EN, FREQ pin
VCC=2.6V～5.5V
0.7×VCC
0.3× VCC
EN,FREQ
IFREQ
0.1×VCC
1.8
IEN
V
5
V
V
9
1
μA
nA
Total Device
Disable Supply Current
IDISABLE
EN=GND
0.1
10
μA
Standby Supply Current
ISBY
VFB=1.3V
0.20
0.35
mA
Average Supply Current
IAVG
VFB=1.0V
2.0
5.0
mA
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GS1663
Typical Operating Characteristics
(VCC=3.3V, VOUT=5V, TA= 25°C, unless otherwise noted)
Efficiency vs. Output Current
NO-Load Supply Current vs. Input Voltage
0.35
100
NO-Load Supply Current(m A)
90
80
Efficiency (%)
70
60
640KHz
50
1.2MHz
40
30
VCC=3.3V
VOUT=5V
20
10
0.3
0.25
0.2
640KHz
1.2MHz
0.15
0.1
VOUT=5V
0.05
0
0
1
10
100
1000
2.5
10000
3
3.5
Output Current (mA)
Efficiency vs. Output Current
5
5.5
12.2
90
12.1
80
60
Output Voltage (V)
70
Efficiency (%)
4.5
Output Voltage vs. Output Current
100
640KHz
50
1.2MHz
40
30
VCC=3.3V
VOUT=12V
20
10
12
TA=-30℃
11.9
TA=25℃
11.8
TA=85℃
11.7
Fosc=640KHZ
11.6
0
11.5
1
10
100
1000
0
100
200
Output Current (mA)
5
90
4.5
Maximum Output Current (A)
80
70
60
640KHz
50
1.2MHz
40
VCC=5V
VOUT=12V
20
10
400
500
600
Maximum Output Current vs. Input Voltage
100
30
300
Output Current (mA)
Efficiency vs. Output Current
Efficiency (%)
4
Input Voltage(V)
Fosc=640KHZ
4
3.5
3
Vout=5V
2.5
Vout=12V
2
1.5
1
0.5
0
0
1
10
100
3
1000
Output Current (mA)
3.2
3.4
3.6
3.8
4
4.2
4.4
4.6
4.8
5
Input Voltage (V)
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CH1=Inductor Current,CH4= VOUT
VCC=3.3V, VOUT=12V
ILOAD=10mA
Frequency=640KHz
CH1=Inductor Current,CH3=EN,CH4=VOUT
VCC=3.3V, VOUT=12V
ILOAD=100mA~500mA
Frequency=640KHz
CH1=Inductor Current,CH3=LX,CH4= VOUT
AC-Coupled
VCC=3.3V, VOUT=12V
ILOAD=600mA
Freq=1.2MHz
CH1=Inductor Current,CH3=EN,CH4=VOUT
VCC=3.3V, VOUT=12V
ILOAD=600mA
Freq=640KHz
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Voltage Reference
A 1.24V reference regulator supplies to the GS1663Z error ampli fier’s non-inverting terminal.
Error Amplifier
The error amplifier compares a sample of the dc-dc converter output voltage with the 1.24V (VREF)
reference and generates an error signal for the PWM comparator. Output voltage of dc-dc converter is
setting with the resistor divider by the following equation:
R1 

VOUT  1 
  1.24
 R2 
VOUT
T
R1
Error Amplifier
2
1
R2
1.24V
RCOMP
GS1663Z
CCOMP
Oscillator
The switching frequency of GS1663Z can be selected to operate at either 640KHz or 1.2MHz.
Connect the FREQ pin to GND for 640KHz operation, or VCC for 1.2MHz operation. FREQ pin has an
internal pull-down current around 5μA. It gives user the option of selecting 640KHz operation by
leaving FREQ unconnected.
Soft Start
The soft start is functional after power on. The interval of soft start time is determined by a
capacitor connected to SS pin. When EN pin is taken high, the soft start capacitor (CSS) is charged by a
constant current of 4μA (typ). During this interval, the SS voltage directly controls the peak inductor
current. The maximum load current is available after the soft-start interval is completed. Once the EN
pin is taken low, the soft-start capacitor is discharged to ground to prepare for next start-up.
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The load must wait for the soft-start interval to finish before drawing a significant amount of load
current. The duration after which the load can begin to draw maximum load current is:
TMAX  6.77  10 5 CSS
EN
The GS1663Z can be turn off to reduce the supply current to 0.1μA when EN is low. In this mode,
the internal reference, error amplifier, comparators, and biasing circuitry turn off while the N-channel
MOSFET is turned off. The boost converter’s output is connected to VCC by the external inductor and
catch diode.
Output Current Capability
The output current capability of the GS1663Z is a function of current limit, input voltage, operation
frequency, and inductor value. Because of the slope compensation used to stabilize the feedback loop,
the duty cycle affects the current limit. The output current capability is governed by the following
equation:
IOUT(MAX)  ILIM  (1.26  0.4  Duty )  0.5  Duty  VIN /( fosc  L )    VIN / VOUT
Where:
ILIM=current limit specified at 65%
Duty=duty cycle=
( VOUT  VIN  VDIODE)
VOUT  ILIM  RON  VDIODE
VDIODE=catch diode forward voltage at ILIM
η=conversion efficiency,85%nominal
Current Limitation
The internal power-MOS switch current is monitored cycle-by-cycle and is limited to the value not
exceed 3A (Typ.). When the switch current reaches the limited value, the internal power-MOS is turned
off immediately until the next cycle.
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Package Outline
SOP-8L (EP)
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
1.346
1.752
A1
0.050
0.152
A2
1.498
D
4.800
4.978
E
3.810
3.987
H
5.791
6.197
L
0.406
1.270
θ°
0°
8°
Exposed PAD Dimensions:
Symbols
Min. (mm)
E1
D1
Max. (mm)
2.184 REF
2.971 REF
Note:
1.
2.
3.
Package dimensions are in compliance with JEDEC outline: MO-178 AA.
Dimension “D” does not include molding flash, protrusions or gate burrs.
Dimension “E” does not include inter-lead flash or protrusions
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