Shouding
SD6210A
Low Noise Regulated Charge Pump DC/DC Converter
Features
Description
The SD6210A is a low noise, constant frequency
(1.20MHz) switched capacitor voltage doubler. It
produces a regulated output voltage from
2 .8V to 5V input with up to 250mA of output
current. Low external parts count (one flying
capacitor and two small bypass capacitors at
VIN and VOUT)make the SD6210A ideally
suited for small, battery-powered applications.
The new charge-pump architecture maintains
constant switching frequency to no load and
reduces both output and input ripple. The
utdown capability and
SD6210A have thermal sh
can survive a continuous short circuit from
VOUT to GND. Built-in soft-start circuitry
prevents
start-up.
The SD6210A is available in the 6-pin SOT-23
package.
excessive
inrush
current
during
Fixed 5V±3% Output
VIN Range: 2.8V
½
5V
Output Current: up to 250mA (V
IN
=4.5V)
Low Noise Constant Frequency Operation
Shutdown Current: <1μA
Short-Circuit Protection
Soft-start
No Inductors
Available in Low Profile 6-Lead SOT-23
Package
Applications
White LED Backlighting
Li-Ion Battery Backup Supplies
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
Pin Assignment and Description
PIN
1
2
(Marking)
NAME
VOUT
GND
EN
C-
VIN
C+
DESCRIPTION
Output
Ground
ON/OFF Control (High Enable)
Flying Capacitor Negative Terminal.
Input
Flying Capacitor Positive Terminal.
3
4
5
6
SOT23-6L Marking
Part Number
SD6210A
Product Code
10A45
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Electrical Characteristics
SD6210A
Operating Conditions: TA = 25℃, V
IN
= 3.6V, V
EN
= V
IN
, C
IN
= C
OUT
= 10μF, unless otherwise noted.
SYMBOL
V
IN
V
OUT
I
SHDN
I
NO LOAD
EFFI
f
OSC
PARAMETER
Input Voltage Range
Output Voltage Range
Shutdown Current
No load input current
Efficiency
Switching Frequency
V
EN
= 0V, V
OUT
= 0V
I
OUT
= 0mA, V
IN
= 2.8V
V
IN
= 2.8V, I
OUT
= 80mA
V
IN
= 3.2V, I
OUT
= 100mA
CONDITIONS
MIN
2.8
4.8
5
0.2
1.8
83
1.20
TYP
MAX
5
5.2
UNITS
V
V
μA
mA
%
MHz
Block Diagram
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Typical Application Circuit
SD6210A
8
SD6210A
Figure 1: Regulated 5V Output
SD6210A
Figure 2: Lithium-Ion Battery to 5V White or Blue LED Drivers
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage…………………….…………………………….…….….…..….……..-0.3V
½
6V
EN Pin Voltage………………………………………………...…………………….…....……-0.3V
½
6V
Output Voltage…..…………………………………………………………………………...-0.3V
½
5.5V
Output Current ……………………….................................………………………...................... 300mA
Operating Temperature Range (Note 2)……………………………………..…….……-40℃
½
+85℃
Maximum Junction Temperature……….…………………………………………………………..+150℃
Storage Temperature Range ……………………………………………...…..………..-65
℃
½
+125℃
Lead Temperature (Soldering, 10 sec.) ……………………………………..………………….…+265℃
Note 1:
Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.
Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.
Note 2:
The SD6210A is guaranteed to meet performance specifications from 0℃ to 70℃. Specifications over the –40℃ to
85℃ operating temperature range are assured by design, characterization and correlation with statistical process
controls.
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Typical Performance Characteristics
SD6210A
Output Voltage vs. Supply Voltage
5.5
5.4
5.3
Output Voltage (V)
5.2
5.1
5
4.9
4.8
4.7
4.6
4.5
2.5
2.9
3.3
3.7
4.1
4.5
Supply Voltage (V)
No Load Supply Current vs. Supply
Voltage
2
1.9
Supply Current (mA)
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
2.5
2.9
3.3
3.7
4.1
4.5
Supply Voltage (V)
Short Circuit Current vs. Supply Voltage
350
Oscillator Frequency (MHz)
300
Short Circuit Current (mA)
250
200
150
100
50
0
2.5
2.9
3.3
3.7
4.1
Supply Voltage (V)
4.5
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
Oscillator Frequency vs.Supply Voltage
2.5
2.9
3.3
3.7
4.1
Supply Voltage (V)
4.5
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Load Current vs. Output Voltage
6
5
Output voltage(V)
SD6210A
V
IN
=3.3V
V
IN
=3.6V
4
V
IN
=3V
3
2
1
0
0
80
160
240
320
400
Load Current (mA)
V
IN
=4.5V
V
IN
=4.2V
Pin Functions
VOUT (Pin 1):
Regulated Output Voltage. VOUT should be bypassed with a low ESR ceramic capacitor
providing at least 10μF of capacitance as close to the pin as possible for best performance.
GND (Pin 2):
Ground. These pins should be tied to a ground plane for best performance. The exposed
pad must be soldered to PCB ground to provide electrical contact and optimum thermal performance.
EN (Pin 3):
Active Low Shutdown Input. This pin must not be allowed to float.
C- (Pin 4):
Flying Capacitor Negative Terminal.
VIN (Pin 5):
Input Supply Voltage. VIN should be bypassed with a low ESR ceramic capacitor providing
at least 10μF of capacitance as close to the pin as possible for best performance.
Application Information
Operation
C+ (Pin 6):
Flying Capacitor Positive Terminal.
The SD6210A use a switched capacitor charge pump to boost VIN to a regulated output voltage.
Regulation is achieved by sensing the output voltage through an internal resistor divider and modulating
the charge pump output current based on the error signal. A 2-phase nonoverlapping clock activates the
charge pump switches. The flying capacitor is charged from VIN on the first phase of the clock. On the
second phase of the clock it is stacked in series with VIN and connected to VOUT. This sequence of
charging and discharging the flying capacitor continues at a free running frequency of 1.2MHz (typ).
In shutdown mode all circuitry is turned off and the SD6210A draw only leakage current from the VIN
supply. Furthermore, VOUT is disconnected from VIN. The EN pin is a CMOS input with a threshold
voltage of approximately 0.8V. The SD6210A is in shutdown when a logic low is applied to the EN pin.
Since the EN pin is high impedance CMOS input it should never be allowed to float. To ensure that its
state is defined it must always be driven with a valid logic level.
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