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Fixed 49V ± 2 Output

VIN Range 27V to 45V

Output Current Up to 110mA（VIN≥3V）
Up to 230mA（VIN≥36V）

Low Noise Constant Frequency (360kHz)
Operation

Shutdown Current <1A

No Inductors

Available in Low Profile 6Lead SOT23
Package

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White LED Backlighting
LiIon Battery Backup Supplies
Smart Card Readers
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The HE9119A is a low noise switched
capacitor voltage doubler It produce a
regulated output voltage from a 27V to 45V
input Low external parts count (one flying
capacitor and two small bypass capacitors at
VIN and VOUT) make the HE9119A ideally
suited for small batterypowered applications
The HE9119A have thermal shutdow
capability and can survive a continuous short
circuit from VOUT to GND A low current
shutdown feature disconnects the load from VIN
and reduces quiescent current to <1uA
The HE9119A is available in the industry
standard SOT236L power packages
PCMCIA Local 5V Supplies
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HE9119A DCDC 2
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Figure 1 Regulated 49V Output
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Top View
SOT236L
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VIN ………………………………………………………………………………… 03V to 6V

VOUT…………………………………………………………………………………… 03V to 55V

VOUT Shortcircuit Duration……………………………………………………………indefinite

VEN………………………………………………………………………………… 03V to 6V

IOUT (Note 2) …………………………………………… 300mA

Operating Temperature Range (Note 3)………………………………………………… 30℃ to 85℃

Lead Temperature (Soldering 10 sec) ……………………………………………………300℃

Storage Temperature Range ………………………………………………… 65℃ to 125℃
Note 1 Absolute Maximum Ratings are those values beyond which the life of a device may be impaired
Note 2 Based on long term current density limitations
Note 3 The HE9119A are guaranteed to meet performance specifications from 0°C to 70°C Specifications over the
–40°C to 85°C operating temperature range are assured by design characterization and correlation with statistical
process controls
PIN NUMBER
SOT236L
PIN NAME
1 VOUT
2 GND
3 EN
4 C
5 VIN
6 C+
HE9119A DCDC 3
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The specifications are at TA 25 ℃ EN VIN CINCOUTCFLY 10uFunless otherwise noted
＊＊ EFFI [(Output Voltage × Output Current) (Input Voltage × Input Current)] × 100
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TA25℃ EN VIN CIN 10uF COUT 10uF CFLY10uF unless otherwise noted
PARAMETER CCOONNDDIITTIIOONNSS MIN TYP MAX UNITS
Input Voltage Range (VIN) 27 45 V
Output Voltage Range (VOUT) 27V ISHDN Shutdown Current EN0VVOUT 0V 02 A
No Load Input Current IOUT 0mA VIN 3V 017 mA
Output Ripple (VR) VIN 36V IOUT 100mA 20 mVPP
Efficiency VIN 3V IOUT 100mA 78
Switching Frequency ( fosc) VIN 36V IOUT 100mA 360 kHz
Efficiency vs Output Current
0
10
20
30
40
50
60
70
80
90
50 100 150 200 250 300
Output Current (mA)
Efficiency ()
VIN3V
VIN42V
VIN36V
Output Voltage vs Output Current
4
41
42
43
44
45
46
47
48
49
5
50 100 150 200 250 300
Output Current (mA)
Output Voltage (V)
VIN3V
VIN42V
VIN36V
HE9119A DCDC 4
Output Voltage vs Supply Voltage
(ILOAD0mA)
42
43
44
45
46
47
48
49
5
51
52
25 29 33 37 41 45
Supply Voltage (V)
Output Voltage (V)
Supply Current vs Supply Voltage
(ILOAD0mA)
0
1
2
3
4
5
6
7
25 29 33 37 41 45
Supply Voltage (V)
Supply Current (mA)
Oscillator Frequency vsSupply Voltage
(ILOAD100mA)
0
50
100
150
200
250
300
350
400
450
500
25 29 33 37 41 45
Supply Voltage (V)
Oscillator Frequency (kHz)
HE9119A DCDC 5
Output Noise（（（（VIN36V ILOAD100mA）））） SW Noise（（（（VIN36V ILOAD100mA））））
Output Noise（（（（VIN42V ILOAD100mA）））） SW Noise（（（（VIN42V ILOAD100mA））））
HE9119A DCDC 6
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VOUT (Pin 1) Regulated Output Voltage VOUT should be bypassed with a low ESR ceramic capacitor
providing more than 22F 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
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
more than 22F of capacitance as close to the pin as possible for best performance
C+ (Pin 6) Flying Capacitor Positive Terminal
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HE9119A DCDC 7
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Operation
The HE9119A 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 2phase 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 360kHz (typ)
In shutdown mode all circuitry is turned off and the HE9119A 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 08V The HE9119A is in shutdown when a logic low is applied to the EN pin
Since the EN pin is a 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
VIN VOUT Capacitor Selection
The style and value of capacitors used with the HE9119A determine several important parameters
such as regulator control loop stability output ripple charge pump strength and minimum startup time
To reduce noise and ripple it is recommended that low ESR (< 01) ceramic capacitors be used for
both CIN and COUT These capacitors should be greater than 22uF Tantalum and aluminum
capacitors are not recommended because of their high ESR
Flying Capacitor Selection
Warning A polarized capacitor such as tantalum or aluminum should never be used for the flying
capacitor since its voltage can reverse upon startup of the HE9119A Low ESR ceramic capacitors
should always be used for the flying capacitor
The flying capacitor controls the strength of the charge pump In order to achieve the rated output
current it is necessary to have more than 22uF of capacitance for the flying capacitor
Layout Considerations
Due to its high switching frequency and the high transient currents produced by the HE9119A careful
board layout is necessary A true ground plane and short connections to all capacitors will improve
performance and ensure proper regulation under all conditions Figure 2 shows an example layout for
the HE9119A
Figure 2 Recommended Layout
HE9119A DCDC 8
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SOT236L Package Outline Dimension
Dimensions In Millimeters Dimensions In Inches Symbol
Min Max Min Max
A 1050 1250 0041 0049
A1 0000 0100 0000 0004
A2 1050 1150 0041 0045
b 0300 0500 0012 0020
c 0100 0200 0004 0008
D 2820 3020 0111 0119
E 1500 1700 0059 0067
E1 2650 2950 0104 0116
e 0950(BSC) 0037(BSC)
e1 1800 2000 0071 0079
L 0300 0600 0012 0024
0° 8° 0° 8°
Subject changes without notice
HE9119A DCDC

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