DatasheetsPDF.com

DC/DC Converter. HT7737SA Datasheet

DatasheetsPDF.com

DC/DC Converter. HT7737SA Datasheet






HT7737SA Converter. Datasheet pdf. Equivalent




HT7737SA Converter. Datasheet pdf. Equivalent





Part

HT7737SA

Description

200mA PFM Synchronous Step-up DC/DC Converter



Feature


HT77xxSA 200mA PFM Synchronous Step-up D C/DC Converter Features • Low start -up voltage: 0.7V (Typ.) • High effi ciency: 2.7V ≤ VOUT ≤ 5.0V upper 90 % (Typ.) • High output voltage accur acy: ±2.5% • Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V • Output curr ent up to 200mA • Ultra low supply c urrent IDD: 5μA (Typ.) • Low ripple and low noise • Low shutdown current.
Manufacture

Holtek Semiconductor

Datasheet
Download HT7737SA Datasheet


Holtek Semiconductor HT7737SA

HT7737SA; : 0.1μA (Typ.) • TO92, SOT89, SOT23 and SOT23-5 package Applications • P almtops/PDAs • Portable communicator s/Smartphones • Cameras/Camcorders Battery-powered equipment General Description The HT77xxSA devices are a high efficiency PFM synchronous step-up DC-DC converter series which are desig ned to operate with both wire wound chi p power inductors and also wi.


Holtek Semiconductor HT7737SA

th multi-layered chip power inductors. T he device series have the advantages of extremely low start-up voltage as well as high output voltage accuracy. Being manufactured using CMOS technology ens ures ultra low supply current. .


Holtek Semiconductor HT7737SA

.

Part

HT7737SA

Description

200mA PFM Synchronous Step-up DC/DC Converter



Feature


HT77xxSA 200mA PFM Synchronous Step-up D C/DC Converter Features • Low start -up voltage: 0.7V (Typ.) • High effi ciency: 2.7V ≤ VOUT ≤ 5.0V upper 90 % (Typ.) • High output voltage accur acy: ±2.5% • Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V • Output curr ent up to 200mA • Ultra low supply c urrent IDD: 5μA (Typ.) • Low ripple and low noise • Low shutdown current.
Manufacture

Holtek Semiconductor

Datasheet
Download HT7737SA Datasheet




 HT7737SA
HT77xxSA
200mA PFM Synchronous
Step-up DC/DC Converter
Features
• Low start-up voltage: 0.7V (Typ.)
• High efficiency: 2.7V VOUT 5.0V upper 90%
(Typ.)
• High output voltage accuracy: ±2.5%
• Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V
• Output current up to 200mA
• Ultra low supply current IDD: 5μA (Typ.)
• Low ripple and low noise
• Low shutdown current: 0.1μA (Typ.)
• TO92, SOT89, SOT23 and SOT23-5 package
Applications
• Palmtops/PDAs
• Portable communicators/Smartphones
• Cameras/Camcorders
• Battery-powered equipment
General Description
The HT77xxSA devices are a high efficiency PFM syn-
chronous step-up DC-DC converter series which are
designed to operate with both wire wound chip power
inductors and also with multi-layered chip power
inductors. The device series have the advantages of
extremely low start-up voltage as well as high output
voltage accuracy. Being manufactured using CMOS
technology ensures ultra low supply current. Because
of their higher operating frequency, up to 500 kHz, the
devices have the benefits of requiring smaller outline
type lower value external inductors and capacitors. The
higher operating frequency also offers the advantages
of much reduced audio frequency noise. The devices
require only three external components to provide a
fixed output voltage of 2.7V, 3.0V, 3.3V, 3.7V or 5.0V.
The HT77xxSA devices include an internal oscillator,
PFM control circuit, driver transistor, reference volt-
age unit and a high speed comparator. They employ
pulse frequency modulation techniques, to obtain
minimum supply current and ripple at light output
loading. These devices are available in space saving
TO92, SOT89, SOT23 and SOT23-5 packages. For
SOT23-5 package types, they also include an internal
chip enable function to reduce power consumption
when in the shutdown mode.
Selection Table
Part No.
HT7727SA
HT7730SA
HT7733SA
HT7737SA
HT7750SA
Output Voltage
2.7V
3.0V
3.3V
3.7V
5.0V
Note: ″xx″ stands for output voltages.
Package
TO92
SOT89
SOT23
SOT23-5
Marking
HT77xxSA (for TO92)
77xxSA (for SOT89)
xxSA (for SOT23)
xxSA (for SOT23-5)
Rev. 1.50
1 June 25, 2016




 HT7737SA
HT77xxSA
Block Diagram
VO UT
LX
LX
L X L im ite r
O SC
B u ffe r
P F M C o n tro l
V re f V O U T
C h ip E n a b le
GND
Pin Assignment
TO 92
S O T89
123
F r o n t V ie w
G N D V O U T LX
1 23
G N D V O U T LX
CE
S O T23
VO UT
3
S O T 2 3 -5
LX
5
GND
4
T o p V ie w
T o p V ie w
12
G N D LX
1 23
CE VO UT NC
B o tto m V ie w
G N D V O U T LX
G N D LX
CE VO UT NC
Pin Description
Pin No.
TO92
SOT89
SOT23
———
223
———
111
332
SOT23-5
1
2
3
4
5
Pin Name
Description
CE
VOUT
NC
GND
LX
Chip enable pin, high active
DC/DC converter output monitoring pin
No connection
Ground pin
Switching pin
Rev. 1.40
2 June 25, 2016




 HT7737SA
HT77xxSA
Absolute Maximum Ratings
Maximum Input Supply Voltage........................... 6.5V
Ambient Temperature Range ................ -40°C to 85°C
Storage Temperature ........................... -50°C to 125°C
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings"
may cause substantial damage to the device. Functional operation of this device at other conditions beyond
those listed in the specification is not implied and prolonged exposure to extreme conditions may affect
device reliability.
Thermal Information
Symbol
Parameter
θJA
Thermal Resistance (Junction to Ambient)
(Assume no ambient airflow, no heat sink)
PD Power Dissipation
Note: PD is measured at Ta=25°C
Package
SOT89
TO92
SOT23
SOT23-5
SOT89
TO92
SOT23
SOT23-5
Max.
300
300
330
320
0.33
0.33
0.30
0.31
Unit
°C/W
°C/W
°C/W
°C/W
W
W
W
W
Electrical Characteristics
Symbol
Parameter
VIN Input Voltage
ΔVOUT
Output Voltage Tolerance
VSTART
VHOLD
Starting Voltage(Fig.1)
Voltage Hold(Fig.1)
Ta= 25°C; VIN= VOUT×0.6; IOUT= 10mA; unless otherwise specified
Test Conditions
Min. Typ. Max. Unit
— — 6.0 V
-2.5 — +2.5 %
VIN : 0 to 2V, IOUT=1mA
VIN : 2 to 0V, IOUT=1mA
— 0.7 0.9 V
— — 0.7 V
IDD1 Supply Current (Fig.2)
Measured at VOUT pin when VOUT+0.5V — 5.0 — μA
IDD2
ISHDN
ILimit
VIH
VIL
ILEAK
fOSC
DOSC
η
Un-load Supply Current (Fig.1)
VIN=VOUT×0.6, IOUT=0mA
Measurement at VIN
Shutdown Current
CE=GND
Current Limit (Fig.1)
CE High Threshold
CE Low Threshold
VOUT ≤ 5.0V
2.7V ≤ VOUT ≤ 3.3V
LX Leakage Current (Fig.3)
Add 5.5V at VOUT pin, 4V at LX pin.
Measured at LX pin.
Oscillator Frequency (Fig.3)
Oscillator Duty Cycle (Fig.3)
Measured at LX pin when VOUT×0.95
Efficiency
2.7V ≤ VOUT ≤ 5.0V, IOUT=10mA
— 13 26 μA
— 0.1 — μA
650 800 — mA
500 650 — mA
2.0 — —
V
— — 0.4 V
— 0.05 — μA
— 500 — kHz
— 80 — %
— 90 — %
Note: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific
performance limits. The guaranteed specifications apply only for the test conditions listed.
Rev. 1.40
3 June 25, 2016



Recommended third-party HT7737SA Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)