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| 型号： | TPS5103IDBG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, SSOP-20 |
| 文件页数： | 1/40页 |
| 文件大小： | 1225K |
| 代理商： | TPS5103IDBG4 |
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20
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11
SOFTSTART
INV
FB
CT
RT
GND
REF
COMP
PWM/SKIP
STBY
LH
OUT_u
LL
OUT_d
OUTGND
TRIP
VCC_SENSE
VCC
VREF5
VREG5V_IN
DB PACKAGE
(TOP VIEW)
TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Step-Down DC-DC Converter
D Three Operation-Modes
– Heavy Load:
– Fixed Frequency PWM
– Hysteretic (User Selectable)
– Light Load:
– Skip Mode
D 4.5-V to 25-V Input Voltage Range
D Adjustable Output Voltage Down to 1.2 V
D 95% Efficiency
D Standby Control
D Overcurrent Protection
D UVLO for Internal 5-V Regulation
D Low-Standby Current . . . 0.5 mA Typical
D TA = –40°C to 85°C
description
The TPS5103 is a synchronous buck dc/dc controller, designed for notebook PC system power. The controller
has three user-selectable operation modes available: hysteretic mode, fixed-frequency PWM control, or SKIP
control.
In high-current applications, where fast transient response is advantageous for reducing bulk capacitance, the
hysteretic mode is selected by connecting the RT pin to VREF5. Selecting the PWM/SKIP modes for less
demanding transient applications is ideal for conserving notebook battery life under light load conditions. The
device includes high-side and low-side MOSFET drivers capable of driving low rds(on) N-channel MOSFETs.
The user-selectable overcurrent protection (OCP) threshold is set by an external TRIP-pin resistor in order to
protect the system. The TPS5103 is configured so that a current-sense resistor is not required, improving the
operating efficiency.
R1
R2
1
SOFTSTART
2
INV
3
FB
4
5
6
GND
7
REF
8
COMP
9
PWM/SKIP
10
STBY
19
OUT_u
17
OUT_d
16
OUTGND
15
TRIP
14
VCC_SENSE
12
VREF5
11
VREG5V_IN
13
20
LH
18
LL
TPS5103
U1
C2
C1
R3
R4
D1
C3
L1
OUTPUT
+
5 V
C4
C5
Q2
Q1
Figure 1. Typical Design
VCC
CT
RT
Copyright
2001, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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