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PDF GP3406 Data sheet ( Hoja de datos )
| Número de pieza | GP3406 | |
| Descripción | 700mA Synchronous Step-Down Converter | |
| Fabricantes | GOLDED-CHIP | |
| Logotipo |  |
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GP3406
1.5MHz, 700mA Synchronous
Step-Down Converter
GENERAL DESCRIPTION
The GP3406 is a 1.5MHz constant frequency,
slope compensated current mode PWM step-
down converter. The device integrates a main
switch and a synchronous rectifier for high
efficiency without an external Schottky diode. It
is ideal for powering portable equipment that
runs from a single cell lithium-Ion (Li+) battery.
The GP3406 can supply 700mA of load current
from a 2.5V to 5.5V input voltage. The output
voltage can be regulated as low as 0.6V. The
GP3406 can also run at 100% duty cycle for
low dropout operation, extending battery life in
portable system. Pulse Skipping Mode operation
at light loads provides very low output ripple
voltage for noise sensitive applications.
The GP3406 is offered in a low profile (1mm)
5-pin,SOT package, and is available with an
adjustable version and fixed output voltage of
1.2V,1.5V and 1.8V or customer-specific versions.
APPLICATIONS
FEATURES
• High Efficiency: Up to 96%
• 1.5MHz Constant Switching Frequency
• 700mA Output Current at VIN=3V
• Integrated Main switch and synchronous
rectifier. No Schottky Diode Required
• 2.5V to 5.5V Input Voltage Range
• Output Voltage as Low as 0.6V
• 100% Duty Cycle Dropout Operation
• 270uA Typical Quiescent Current
• Slope Compensated Current Mode Control
for Excellent Line and Load Transient
Response
• Short Circuit Protection
• Thermal Fault Protection
• <1µA Shutdown Current
• Space Saving 5-Pin Thin SOT23 package
• Cellular and Smart Phones
• Microprocessors and DSP Core Supplies
• Wireless and DSL Modems
• PDAs
• Portable Media players / MP3 Players
• Digital Still and Video Cameras
• Portable Instruments
Typical Application
GP3406_ADJ
Figure 1. Basic Application Circuit with
GP3406 adjustable version, Vout = 1.8V
Efficiency vs. Output Current
100
90 VIN = 2.7V
80 VIN = 3.6V
70
60
50
40 VIN = 4.2V
30
VOUT = 1.8V
20 TA = 25°C
10
0.1
1 10 100
OUTPUT CURRENT (mA)
1000
Preliminary datasheet
Page 1-12
Rev. 1.1 May. 8, 2008
1 page  
Efficiency vs Load Current
100
90 VIN = 3.6V
VOUT 2.5V
80 TA = 25°C
70
60 L = 10 uH
50
L = 4.7 uH
40
30
20 L = 2.2 uH
10 L = 1.4 uH
0
0.1 1 10 100
LOAD CURRENT (mA)
1000
Frequency vs Input Voltage
1.46
1.45
1.44
1.43
VOUT = 1.8V
ILOAD = 150mA
L = 2.2uH
1.42
1.41
1.4
1.39
1.38
1.37
1.36
2.7
3.15
3.6 4.05 4.5 4.95
INPUT VOLTAGE (V)
5.4
Reference Voltage vs Temperature
0.6080
0.6072 VIN = 3.6V
0.6064
0.6056
0.6048
0.6040
0.6032
0.6024
0.6016
0.6008
-50 -30 -10 10 30 50 70 90
TEMPERATURE (C)
GP3406
1.84
1.82
1.8
1.78
1.76
1.74
1.72
1.7
1.68
1.66
1.64
0
Output Voltage vs Load Current
VOUT = 1.8V
VIN = 3.6V
L = 2.2uH
200 400 600 800 1000 1200
LOAD CURRENT (mA)
RDS(ON) vs Input Voltage
0.6
0.5
P-Channel MOSFET
0.4
0.3
0.2 N-Channel MOSFET
0.1
01234567
INPUT VOLTAGE (V)
RDS(ON) vs Temperature
0.38
0.36 VIN = 3.6V
0.34
0.32
0.30
P-Channel MOSFET
0.28
0.26
0.24
0.22
0.20
N-Channel MOSFET
0.18
-45 -30 -15 0 15 30 45 60 75 90
Temperature (C)
Preliminary datasheet
Page 5-12
Rev. 1.1 May. 8, 2008
5 Page 
APPLICATIONS
INFORMATION
Figure 4 below shows the basic application
circuit with GP3406 fixed output versions.
Figure 4. Basic Application Circuit with fixed
output versions
Setting the Output Voltage
Figure 1 above shows the basic application
circuit with GP3406 adjustable output version.
The external resistor sets the output voltage
according to the following equation:
VOUT
= 0.6V
× ⎜⎛1 +
⎝
R2 ⎟⎞
R1 ⎠
Table 1 Resistor select for output voltage setting
VOUT
1.2V
R1(R3)
316k
R2(R4)
316k
1.5V
316k
470k
1.8V
316k
634k
2.5V
316k
1000k
Inductor Selection
For most designs, the GP3406 operates with
inductors of 1µH to 4.7µH. Low inductance
values are physically smaller but require faster
switching, which results in some efficiency loss.
The inductor value can be derived from the
following equation:
( )L = VOUT × VIN − VOUT
VIN × ΔI L × fOSC
Where ΔI L is inductor Ripple Current. Large
value inductors lower ripple current and small
value inductors result in high ripple currents.
Choose inductor ripple current approximately
35% of the maximum load current 600mA, or
ΔI L =210mA.
GP3406
efficiency is important, the minimum
recommended inductor is 2.2µH. For optimum
voltage-positioning load transients, choose an
inductor with DC series resistance in the 50mΩ
to 150mΩ range. For higher efficiency at heavy
loads (above 200mA), or minimal load regulation
(but some transient overshoot), the resistance
should be kept below 100mΩ. The DC current
rating of the inductor should be at least equal to
the maximum load current plus half the ripple
current to prevent core saturation
(600mA+105mA). Table 2 lists some typical
surface mount inductors that meet target
applications for the GP3406.
Table 2. Typical Surface Mount Inductors
Part #
Sumida
CR43
Sumida
CDRH4D18
Toko
D312C
L
(µH)
1.4
2.2
3.3
4.7
1.5
2.2
3.3
4.7
1.5
2.2
3.3
4.7
Max
DCR
(mΩ)
56.2
71.2
86.2
108.7
75
110
162
120
140
180
240
Rated
D.C.
Current
(A)
2.52
1.75
1.44
1.15
1.32
1.04
0.84
1.29
1.14
0.98
0.79
Size
WxLxH
(mm)
4.5x4.0x3.5
4.7x4.7x2.0
3.6x3.6x1.2
Input Capacitor Selection
The input capacitor reduces the surge current
drawn from the input and switching noise from
the device. The input capacitor impedance at
the switching frequency shall be less than input
source impedance to prevent high frequency
switching current passing to the input. A low
ESR input capacitor sized for maximum RMS
current must be used. Ceramic capacitors with
X5R or X7R dielectrics are highly recommended
because of their low ESR and small temperature
coefficients. A 4.7µF ceramic capacitor for most
applications is sufficient.
Output Capacitor Selection
The output capacitor is required to keep the
output voltage ripple small and to ensure
regulation loop stability. The output capacitor
must have low impedance at the switching
frequency. Ceramic capacitors with X5R or X7R
dielectrics are recommended due to their low
Preliminary datasheet
Page 11-12
Rev. 1.1 May. 8, 2008
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet GP3406.PDF ] | |
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