HN9261/A
HN9261/A
PFM Step-up DC/DC Converter
Product Description
The HN9261 series are PFM Step-up DC/DC ICs (pulse voltage regulators) with output voltages 1.5; 2.5; 3.3; 5.0V. The
ICs of pulse voltage regulators are purposed for use in power supply sources of consumer & industrial electronic
devices with battery-power sourcing. The application of this ICs permit to keep constant output voltage of power supply
source even in the case of low charge level of the battery.
The HN9261 consists of an oscillator, a PFM control circuit, a driver transistor (LX switch), a reference voltage unit, an
error amplifier, resistors for voltage detection, and a LX switch protection circuit. A low ripple and high efficiency step-up
DC/DC converter can be constructed of this HN9261 with only three external components.
The HN9261A provides with a drive pin (EXT) for an external transistor, so that a power transistor can be externally
applied. Therefore, the HN9261A IC is recommended for applications where large currents are required. EN pin enables
circuit to set the standby supply current at a maximum of 0.5μ .
Features
• Minimal Number of External Components ( Only
an inductor, a diode, and a capacitor)
• Ultra Low Input Current ( 5μ at Switch Off State)
• High Output Voltage Accuracy ± 2%
• Low Ripple and Low Noise
• Low Start-up Voltage, 0.85V at 1mA
.
• 75% Efficiency with Low Cost Inductor
• Low Temperature-Drift +50 ppm/°C
Applications
• Power source for battery powered systems
• Power source for cameras, VCRs, PDAs,
pagers, electronic data banks, and hand-held
communications equipment
• Portable consumer equipment instrumentation
• Power source for applications, which require
higher voltage than that of batteries used in the
applicances
Ordering Information
HN9261/A-
Package Type
M : SOT-23-5
S : SOT-89
Operating Temperature Range
C : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
15 : 1.5V
25 : 2.5V
33 : 3.3V
50 : 5.0V
Use external switch
Use internal switch
Pin Configurations
(TOP VIEW)
1
2
3
1
2
3
GND VOUT LX
(TAB)
GND VOUT EXT
(TAB)
HN9261
SOT-89
HN9261A
LX
5
GND
4
EXT
5
GND
4
Pin Description
Pin Number
SOT-89 SOT-25
1
2
1
3
3
2
3
4
5
5
CE
VOUT
NC
GND
LX
EXT
Chip Enable Input (Active High)
Output Voltage
No Connected
Ground (Common)
Switching Pin
External Control
Pin Name
Pin Function
2
3
2
3
EN VOUT NC
EN VOUT NC
HN9261
SOT-23-5
HN9261A
地址: 南京市珠江路
88
号，新世界中心
B
座
4004
室, 邮编:210008
ADD.: RM. 4004,
BLOCK B,
NEW WORLD CENTRE,
电话(TEL.):
(86)-25-68853600
NANJING 210008,
CHINA
传真(FAX):
(86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
NO. 88 ZHUJIANG ROAD,
1
HN [ NANJING HONANO ELECTRONIC CO., LTD. ]
