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PWM Converter. HT7991 Datasheet

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PWM Converter. HT7991 Datasheet






HT7991 Converter. Datasheet pdf. Equivalent




HT7991 Converter. Datasheet pdf. Equivalent





Part

HT7991

Description

1MHz Asynchronous Step-up PWM Converter



Feature


HT7991 2.5A Peak Current, 1MHz Asynchron ous Step-up PWM Converter Features • Input Voltage from 2.6V to 5.5V • Adjustable Output Voltage Up to 12V • Internal 0.2Ω Low Power Switch • Fixed PWM Switching Frequency: 1MHz • Precision Feedback Reference Voltage: 0.6V (±2%) • Ultra Low Shutdown Cu rrent: 0.1μA • Embedded Loop Freque ncy Compensation • Programmable OC.
Manufacture

Holtek Semiconductor

Datasheet
Download HT7991 Datasheet


Holtek Semiconductor HT7991

HT7991; P Threshold via External Resistor, ROC Complete Protections: Soft Start , UVLO, OCP, OTP and OVP • Package Typ e: SOT23-6 Applications • All Singl e Cell Li or Dual Cell Battery Applicat ion • Portable Equipment/Handheld De vices General Description The HT7991 is a current mode asynchronous stepup DC- DC converter. The fully integrated powe r MOSFET transistor, with .


Holtek Semiconductor HT7991

its 0.2Ω drain source resistance, ensur es a high level of device power efficie ncy. A fixed 1MHz switching frequency h as been chosen to permit smaller induct ors to be used in the application circu it. The error amplifier noninverting .


Holtek Semiconductor HT7991

.

Part

HT7991

Description

1MHz Asynchronous Step-up PWM Converter



Feature


HT7991 2.5A Peak Current, 1MHz Asynchron ous Step-up PWM Converter Features • Input Voltage from 2.6V to 5.5V • Adjustable Output Voltage Up to 12V • Internal 0.2Ω Low Power Switch • Fixed PWM Switching Frequency: 1MHz • Precision Feedback Reference Voltage: 0.6V (±2%) • Ultra Low Shutdown Cu rrent: 0.1μA • Embedded Loop Freque ncy Compensation • Programmable OC.
Manufacture

Holtek Semiconductor

Datasheet
Download HT7991 Datasheet




 HT7991
HT7991
2.5A Peak Current, 1MHz
Asynchronous Step-up PWM Converter
Features
• Input Voltage from 2.6V to 5.5V
• Adjustable Output Voltage Up to 12V
• Internal 0.2Ω Low Power Switch
• Fixed PWM Switching Frequency: 1MHz
• Precision Feedback Reference Voltage: 0.6V (±2%)
• Ultra Low Shutdown Current: 0.1μA
• Embedded Loop Frequency Compensation
• Programmable OCP Threshold via External
Resistor, ROC
• Complete Protections: Soft Start , UVLO, OCP,
OTP and OVP
• Package Type: SOT23-6
Applications
• All Single Cell Li or Dual Cell Battery Application
• Portable Equipment/Handheld Devices
General Description
The HT7991 is a current mode asynchronous step-
up DC-DC converter. The fully integrated power
MOSFET transistor, with its 0.2Ω drain source
resistance, ensures a high level of device power
efficiency. A fixed 1MHz switching frequency has
been chosen to permit smaller inductors to be used
in the application circuit. The error amplifier non-
inverting input amplifier is connected to an internal
precision 0.6V/±2% reference voltage while an
integrated soft-start function reduces the inrush
current during the converter start up period. The
device is available in a SOT23-6 package type.
Application Circuit
VIN=2.6V~4.2V
C1
47µF
C2
0.1µF
OFF
ON
R3
L1
3.3µH
HT7991
5
VIN
1
LX
4
EN
6
OC
3
FB
2
GND
D1
R1
R2
VOUT
C3
47µF
C4
0.1µF
Rev. 1.30
94.0%
VOUT=5.1V
92.0%
90.0%
88.0%
86.0%
84.0%
Vin=3.3V
Vin=3.7V
Vin=4.2V
82.0%
0
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
IOUT (A)
2
1
March 21, 2018




 HT7991
Block Diagram
OC
EN
OCP Adjuestment
Enable Control
HT7991
UVLO
VIN
PWM
Comparator
OSC
Control
Logic
Slope
Compensation
GND
Soft-start
EA
0.6V
GND
OVP
OTP
LX
PGND
FB
Rev. 1.30
2 March 21, 2018




 HT7991
Pin Assignment
SOT23-6
6 54
7991 Top View
1 23
Pin Description
Pin Order
1
2
3
4
5
6
Name
LX
GND
FB
EN
VIN
OC
Type
O
G
I
I
P
I
Pin Description
Power switch output
Ground terminal
Error amplifier inverting input
Enable control - High active
Power supply input
Adjustment current limit via an external resistor to ground
HT7991
Absolute Maximum Ratings
Parameter
VIN
LX
Other Pins
Power Dissipation
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering 10sec)
ESD Susceptibility
Human Body Model
Machine Model
Junction-to-Ambient Thermal Resistance, θJA
Value
-0.3 to +6
-0.3 to +17
+6
455
+150
-65 to +150
+260
2000
200
220
Unit
V
V
V
mW
°C
°C
°C
V
V
°C/W
Recommended Operating Range
Parameter
VIN
Operating Temperature Range
Value
2.6 to 5.5
-40 to +85
Unit
V
°C
Note that Absolute Maximum Ratings indicate limitations beyond which damage to the device may occur.
Recommended Operating Ratings indicate conditions for which the device is intended to be functional, but do not
guarantee specified performance limits.
Rev. 1.30
3 March 21, 2018



Recommended third-party HT7991 Datasheet






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