LT1301CS8 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LT1301CS8

Micropower High Efficiency 5V/12V Step-Up DC/DC Converter for Flash Memory

Linear Technology 

APPLICATIONS INFORMATION

Table 1. Recommended Inductors

PART NUMBER

DO3316-333

DO1608-223

DO1608-103

CTX20-1

GA10-332

LQH3G220K04M00

CD73-330KC

CDRH62-330MC

VENDOR

Coilcraft

Coilcraft

Coilcraft

Coiltronics

Gowanda

Murata-Erie

Sumida

Sumida

L (µH)

33

22

10

20

33

22

33

33

DCR (Ω) VIN(V)

0.088 3.3

5

.31 3.3

3.3

5

5

.11

2

.175 3.3

5

.077 3.3

5

0.7 3.3

5

0.131 3.3

5

0.48 3.3

5

ILIM PIN

Open

Open

Open

Ground

10k

Ground

Open

Open

Open

Open

Open

Ground

Ground

Open

Open

Open

Ground

Open

Ground

EFFICIENCY (%)

30mA 60mA 120mA

84

84

85

89

89

90

82

82

—

85

—

—

86

87

—

88

—

—

78

—

—

84

84

—

88

88

89

86

86

87

89

89

90

81

—

—

85

—

—

84

85

86

88

88

89

80

80

81

85

—

—

84

84

85

83

—

—

LT1301

COMPONENT

HEIGHT (mm)

5.5

3.5

PHONE NUMBER

(708) 639–6400

3.5

4.2

Through-Hole

2.0

3.5

3.0

(407) 241-7876

(716) 532-2234

(404) 436-1300

(708) 956-0666

switching. Zero load current causes the LT1301 to switch

so infrequently that C3 can completely discharge reducing

subsequent peak switch current to 400mA. If a load is

suddenly applied, output voltage will sag until C3 can be

recharged and peak switch current returns to 1A.

If the full capacity of the LT1301 is not required peak

current can be reduced by changing the value of R3 as

shown in Figure 8. With R3 = 0 switch current is limited to

approximately 400mA. Smaller, less expensive inductors

with lower saturation ratings can then be used.

Inductor Selection

For full output power, the inductor should have a satura-

tion current rating of 1.25A for worst-case current limit,

although it is acceptable to bias an inductor 20% or more

into saturation. Smaller inductors can be used in conjunc-

tion with the ILIM pin. Efficiency is significantly affected by

inductor DCR. For best efficiency limit the DCR to 0.03Ω

or less. Toroidal types are preferred in some cases due to

their inherent flux containment and EMI/RFI superiority.

Recommended inductors are listed in Table 1.

Table 2. Recommended Capacitors

VENDOR

AVX

Sanyo

Panasonic

SERIES

TPS

OS-CON

HFQ

TYPE

Surface Mount

Through-Hole

Through-Hole

PHONE#

(803)448–9411

(619) 661–6835

(201) 348-5200

1100

1.6V ≤ VIN ≤ 5V

1000

900

800

700

600

500

400

300

100

1k

10k

100k

1M

CURRENT LIMIT SET RESISTOR (Ω)

LT1301 F8

Figure 8. Peak Switch Current vs. Current Limit Set Resistor

7

Share Link: