GMT G5104T11U 300ma alkaline boost dc/dc converters in sot-23-5 Datasheet

G5104
Global Mixed-mode Technology Inc.
300mA Alkaline Boost DC/DC Converters in SOT-23-5
Features
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General Description
Configurable Output Voltage Up to 5.5V
40µA Quiescent Current
<1µA Shutdown Current
<1µA Shutdown Pin Current
Supply Range from 1.7V to 5.5V
Low VDS(on): 120mV (ISW=400mA)
Tiny SOT-23-5 Package
The G5104 boost converter is designed for 3.3V/5V
powered system.
Due to a typical 40µA quiescent current and 1.7V~
5.5V supply voltage range, it is suitable for battery
powered portable applications. Such as PDAs and
Handheld Computers. When the IC sets to shutdown
mode, it only consumes less than 1µA.
Applications
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Furthermore, the 500mA current limit, 450ns fixed
minimum off-time and tiny SOT23-5 package facilitates the use of smaller inductor and other surface-mount components to minimize the PCB size in
those space-conscious applications.
Personal Digital Assistants (PDAs)
Handheld Computers
Digital Still Cameras
Cellular Phones
WebPad
Local 3V to 5V Conversion
To control the IC, no other external current is needed
for the shutdown pin. It typically consumes less than
1µA of full supply range.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
TEMP. RANGE
PACKAGE
G5104T11U
G5104T1Uf
5104X
-40°C ~ +85°C
SOT-23-5
Note:T1: SOT-23-5
U: Tape & Reel
Pin Configuration
Typical Application Circuit
4.7µH
5V
300mA
VIN
3V
SW
1
5
VCC
VCC
SW
10pF
(option)
1M
GND 2
G5104
G5104
G963
47µF
4
FB 3
SHDN
47µF
FB
SHDN
GND
316k
SOT-23-5
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G5104
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Junction Temperature ......….......….......….........+125°C
Storage Temperature…………......……-65°C to +150°C
Reflow Temperature (Soldering, 10 sec)…….…+260°C
SW to GND………………………….……….-0.3V to +7V
FB to GND…………… ……………………....-0.3V to VCC
VCC, SHDN to GND...........................….....-0.3V to +7V
Operating Temperature Range (Note 1) -40°C to +85°C
Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device.
Electrical Characteristics
(VCC = 3.6V, V SHDN = 3.6V, TA = 25°C)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1.7
-----
--40
0.1
5.5
80
1
V
µA
µA
1.18
1.2
1.22
V
---------
-0.05
--450
120
--1
--160
%/V
µA
ns
mV
Switch Current Limit
400
500
600
mA
SHDN Pin Current
---
0.1
1
µA
SHDN Input Voltage High
0.9
---
---
V
SHDN Input Voltage Low
---
---
0.25
V
---
0.01
5
µA
Input Voltage Range
Not Switching
V SHDN = 0V
Quiescent Current
FB Comparator Trip Point
Output Voltage Line Regulation
FB Pin Bias Current (Note 2)
Switch Off Time
Switch VDS(ON)
2.5V<VIN<5.5V
VFB = 1.2V
ISW = 0.4A
Switch Leakage Current
Switch Off, VSW = 7V
Note 1: The G5104 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the
-40°C to 85°C operating temperature range are assured by design, characterization and correlation with
statistical process controls.
Note 2: Bias current flows into the FB pin.
Block Diagram
L1
VOUT
VIN
C2
C1
BIAS
VOUT
C3
(option)
R1
FB
+
SW
SHDN
VCC
SHUTDOWN
LOGIC
PUMP CONTROL
OC
DRIVER
COMP
ERROR
COMP
en_sw
+
TOFF PULSE
CONTROL
R2
1.2V
VREF
GND
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VCC=+3V, V SHDN =+3V, L=4.7µH, TA=25°C, unless otherwise noted.)
Feedback Voltage vs. Temperature
1.5
1.2
1.2
Feedback Voltage (V)
Feedback Voltage (V)
Feedback Voltage vs. Input Voltage
1.5
0.9
0.6
0.3
0.9
0.6
0.3
0
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
-40
6
-20
0
20
40
60
80
100
Temperature (°C)
Input Voltage (V)
RDS_on vs. Temperature
RDS_on vs. Input Voltage
600
400
300
RDS_on (mΩ)
RDS_on (mΩ)
500
400
300
200
200
100
100
0
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
-40
-20
Current Limit vs. Input Voltage
20
40
60
80
100
Current Limit vs. Temperature
800
600
700
Current Limit (mA)
500
Current Limit (mA)
0
Temperature (°C)
Input Voltage (V)
400
300
200
100
600
500
400
300
200
100
0
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
-40
Input Voltage (V)
-20
0
20
40
60
80
100
Temperature (°C)
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Efficiency vs. Input Voltage
Efficiency vs. Output Current
90
90
85
85
80
80
VIN=4.2V
Efficiency (%)
Efficiency (%)
VIN=3.0V
75
70
65
VIN=2.4V
75
VIN=3.6V
VIN=1.7V
70
65
VO=5V, IO=100mA
60
60
1.5
2
2.5
3
3.5
4
0.1
4.5
1
10
100
1000
Output Current (mA)
Input Voltage (V)
Load Transient
Line Transient
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G5104
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
1
2
SW
GND
3
FB
4
SHDN
5
VCC
FUNCTION
Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor.
Ground.
Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Block Diagram):
R1 = R2
VOUT
-1
1.2
Active-Low Shutdown Pin. Tie this pin to logic-high to enable the device or tied it to logic-low to turn this
device off.
Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.
Function Description
delay time. During this time, the inductor current exceeds the current limit by a small amount. The formula
below can calculate the peak inductor current.
The G5104 is a boost converter with a NMOS
switch embedded (refer to Block Diagram). The
boost cycle is getting started when FB pin voltage
drop below 1.2V as the NMOS switch turns on.
During the switch on period, the inductor current
ramps up until 500mA current limit is reached. Then
turns the switch off, while the inductor current flows
through external schottky diode, and ramps down to
zero. During the switch off period, the inductor current charges output capacitor and the output voltage is boosted up. This pumping mechanism continues cycle by cycle until the FB pin voltage exceed 1.2V and entering the none switching mode.
IPEAK = ILIM +
Where VSAT = 0.2V (switch saturation voltage). When
the systems with high input voltages and uses smaller
inductance value, the current overshoot will be most
apparent. This overshoot can be useful as it helps increase the amount of available output current. To use
small inductance value for systems design, the current
limit overshoot can be quite high. Even if it is internally
current limited to 500mA, the power switch of the
G5104 can operate larger currents without any problem, but the total efficiency will suffer. The IPEAK is keep
below 700mA for the G5104 will be obtained best performance.
Applications Information
Choosing an Inductor
There are several recommended inductors that work
well with the G5104 in Table 1. Use the equations and
recommendations in the next few sections to find the
proper inductance value for your design.
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors
should be used at the output to minimize the output
ripple voltage and the peak-to-peak transient voltage.
Multilayer ceramic capacitors (MLCC) are the best
choice, as they have a very low ESR and are available
in very small packages. Their small size makes them a
good match with the G5104’s SOT-23 package. If solid
tantalum capacitors (like the AVX TPS, Sprague 593D
families) or OS-CON capacitors are used, they will
occupy more volume than a ceramic ones and the
higher ESR increases the output ripple voltage. Notice
that use a capacitor with a sufficient voltage rating.
A low ESR surface-mount ceramic capacitors also
make a good selection for the input bypass capacitor,
which should be placed as close as possible to the
G5104. A 47µF input capacitor is sufficient for most
applications.
Table 1. Recommended Inductors
PART
LQH3C4R7
LQH3C100
LQH3C220
972AS-4R7M
972AS-100M
A914BYW-4R7
M
A914BYW-100M
VALUE(µH) MAX DCR (Ω)
4.7
10
22
4.7
10
4.7
10
0.26
0.30
0.92
0.22
0.48
0.072
0.125
VIN(MAX ) − VSAT
x 100ns
L
VENDOR
Murata
www.murata.com
TOKO
www.toko.co.jp
Current Limit Overshoot
The G5104 use a constant off-time control scheme,
the power switch is turned off after the 500mA current
limit is reached. When the current limit is reached and
when the switch actually turns off, there is a 100ns
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G5104
Global Mixed-mode Technology Inc.
Diode Selection
For most G5104 applications, the high switching frequency requires a high-speed rectifier Schottky diodes,
such as the VISHAY SS12 (1A, 20V) with their low
forward voltage drop and fast switching speed, are
recommended. Many different manufacturers make
equivalent parts, but make sure that the component is
rated to operate at least 0.5A. To achieve high efficiency, the average current rating of the Schottky diodes should be greater than the peak switching current. Choose a reverse breakdown voltage greater
than the output voltage.
ramping up the inductor current, then delivering that
current to the load. To use low ESR capacitors will
help minimize the output ripple voltage, but proper
selection of the inductor and the output capacitor also
plays a big role. If a larger inductance value or a
smaller capacitance value is used, the output ripple
voltage will increase because the capacitor will be
slightly overcharged each burst cycle. To reduce the
output ripple, increase the output capacitance value or
add a 10pF feed-forward capacitor in the feedback
network of the G5104 (see the circuits in the Typical
Applications section). To add this small, inexpensive
10pF capacitor will greatly reduce the output voltage
ripple.
Lowering Output Voltage Ripple
The G5104 supplies energy to the load in bursts by
Typical Applications
Boost Converter
L1
4.7µH
LED Driver
VIN
2.5V to 4.2V
VIN
2.7V to 4.2V
5V
300mA
VCC
VOUT
C1
C2
up to 9 LEDs
SW
G5104
SHDN
C1
47µF
D1
L1
D1
R1
1M
G5104
FB
GND
R2
316k
SW
VCC
C2
47µF
PWM Dimming
L1: MURATA LQH3C4R7M24
D1: VISHAY SS12
SHDN
FB
GND
RS
C1: MLCC 4.7µF 6.3V
C2: MLCC4.7µF 35V
L1: MURATA LQH3C4R7M24
D1: MOTOROLA MBR0540
D2: RB751V
RS: 60Ω 1%
M1: FDN337N
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G5104
Global Mixed-mode Technology Inc.
Package Information
C
D
L
E
H
θ1
e1
e
A
A2
A1
b
Note:
1.
2.
3.
4.
Package body sizes exclude mold flash protrusions or gate burrs
Tolerance ±0.1000 mm (4mil) unless otherwise specified
Coplanarity: 0.1000mm
Dimension L is measured in gage plane
SYMBOL
MIN
DIMENSIONS IN MILLIMETER
NOM
MAX
A
1.00
1.10
1.30
A1
A2
b
C
D
E
e
0.00
0.70
0.35
0.10
2.70
1.40
-----
----0.80
0.40
0.15
2.90
1.60
1.90(TYP)
0.10
0.90
0.50
0.25
3.10
1.80
-----
e1
-----
0.95
-----
H
L
θ1
2.60
0.37
2.80
------
3.00
-----
1º
5º
9º
Taping Specification
PACKAGE
SOT-23-5
Q’TY/BY REEL
3,000 ea
Feed Direction
SOT-23-5 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.
TEL: 886-3-5788833
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Ver: 1.2
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